CN100440722C - Inverter system, AC ratory machine and electric inverter - Google Patents
Inverter system, AC ratory machine and electric inverter Download PDFInfo
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- CN100440722C CN100440722C CNB2005101194217A CN200510119421A CN100440722C CN 100440722 C CN100440722 C CN 100440722C CN B2005101194217 A CNB2005101194217 A CN B2005101194217A CN 200510119421 A CN200510119421 A CN 200510119421A CN 100440722 C CN100440722 C CN 100440722C
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Abstract
An inverter system is configured to include an electric power converter 1, an 3-phase AC rotary machine 3, a 4-core non-coaxial cable 2 that establishes connections between the electrical power converter 1 and the 3-phase AC rotary machine 3, and causes a grounding conductor and 3-phase feedline to serve as an identical cable, and a capacitor 4 connected between the grounding terminals of the rotary machine 3 in relation to one-phase feeder terminal portion among the 3-phase feeder terminal portion of the rotary machine 3, so that the capacitance between the 3-phase feeder line and the grounding conductor becomes nearly equal with each of the three phases. To provide an AC rotary machine, and electric power converter, capable of suppressing an overvoltage generated in AC rotary machine portion by equipment configuration at a low cost, and appropriately suppressing overvoltage, in an inverter system that consists of an electric power converter and the AC rotary machine.
Description
Technical field
The present invention relates to be connected in the changer system (Inverter system) of the AC rotary machine formation on this power converter the changer system of the overvoltage surge that produces in AC rotary machine portion when being suppressed at system acting at power converter, by 3 phase cables with PWM (pulse width modulation) mode.In addition, the invention still further relates to the AC rotary machine and the power converter that can suppress above-mentioned overvoltage surge.
Background technology
In the power-converting device of PWM mode,, thereby adjust output voltage according to the switch element of high-frequency carrier signal conducting and disconnection output-stage circuit.And connecting 3 mutually in the cable of this power-converting device and AC rotary machine (motor or generator), and there are resistance components R corresponding and inductance composition L with the length of cable, there is electrostatic capacitance C between this outside line or over the ground.As a result, if 3 phase cables are exported voltage jumpy,, add overvoltage in the portion of terminal of AC rotary machine then because based on the resonance of RLC from power-converting device.Therefore, from began to produce overvoltage in the past, overvoltage is set simultaneously suppresses parts (for example with reference to patent documentation 1) for the portion of terminal that is suppressed at AC rotary machine.
In patent documentation 1, being described in by the direct transform device that from exchange conversion is direct current, this DC converting is the nonisulated type power-converting device of input that becomes of the inverse transformation mechanism that exchanges, by the capacitor neutral point of the interchange output filter that is made of capacitor and inductance is connected with DC circuit portion, the overvoltage that suppresses the superpotential mode of rotation feeder terminal portion suppresses parts.
In addition, in the drive unit that constitutes by power converter and AC rotary machine, in the past, in order to suppress external instrument to be brought harmful effect from the common-mode noise that power converter takes place, the heart yearn that uses coaxial cable in being connected of the input terminal of the lead-out terminal of power converter and AC rotary machine is arranged, the two ends of coaxial cable are connected to the drive unit (for example with reference to patent documentation 2) on the framework (earth terminal) of the framework (earth terminal) of power converter and AC rotary machine.In such drive unit, suppressing common-mode noise is purpose, not the overvoltage surge that suppresses whirler inside as purpose, but the coaxial cable by using 3 single cores or the coaxial cable of 3 cores, as a result of, can avoid being suppressed at the portion of terminal generation overvoltage of AC rotary machine.
[patent documentation 1] spy opens flat 9-294381 communique
[patent documentation 2] spy opens flat 10-135681 communique
But, in the overvoltage suppressor mode described in the patent documentation 1, connect 3 all identical mutually interchange output filters, relatively more expensive as filter.
In addition, in the drive unit described in the patent documentation 2, the coaxial cable by using 3 single cores or the coaxial cable of 3 cores, consequently suppress superpotential generation, but coaxial cable particularly coaxial cable and the ethene cabtyre cable of multicore to compare price high, increase if exist cable length in the changer system of low capacitance levels, then spend with whirler with converter sometimes and compare, the expense of flower on multicore coaxial cable is more.
Summary of the invention
Existence in view of the above problems, the objective of the invention is to: be provided in the changer system that constitutes by power converter and AC rotary machine, can be accompanied by the switch of converter and the superpotential changer system that produces in AC rotary machine portion by the low-cost apparatus STRUCTURE DEPRESSION.In addition, the present invention also aims to: provide and suitably to suppress described superpotential AC rotary machine and power converter.
Changer system of the present invention comprises: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, the earth terminal portion that is connected to described whirler and described whirler 31 in the feeder terminal portion be mutually or the capacitor between the feeder terminal portion of 2 phases mutually.
In addition, changer system of the present invention comprises: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, 1 in the earth terminal portion that is connected to described power converter and the 3 phase output terminals portions of described power converter are mutually or the capacitor between the output terminal part of 2 phases.
In addition, changer system of the present invention comprises: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, be connected to described earth connection and described 31 in the supply lines be mutually or the capacitor between the supply lines of 2 phases mutually.
In addition, changer system of the present invention comprises: power converter; 3 cross streams whirlers; Earth connection with 3 mutually supply lines be same cable, at least 4 cores, 3 non-coaxial cables of equal in length, wherein in series dispose above-mentioned 3 non-coaxial cables, with above-mentioned 3 non-coaxial cables above-mentioned power converter and above-mentioned 3 cross streams whirlers are coupled together, wherein above-mentioned 3 non-coaxial cables are connected to by between each non-coaxial cable, changing each phase supply lines configuration and connect, and make between above-mentioned 3 phase supply lines and the above-mentioned earth connection electrostatic capacitance 3 mutually in about equally, make 3 in each non-coaxial cable mutually the supply lines of each phase with respect to the configuration change that is arranged on the earth connection in this non-coaxial cable.
In addition, AC rotary machine of the present invention in 3 phase power supply terminals of whirler at least 1 phase power supply terminal and earth terminal between have variable capacitor.
In addition, power converter of the present invention in 3 phase output terminals of power converter at least 1 phase output terminals and earth terminal between have variable capacitor.
According to the present invention, equate by supply lines and the electrostatic capacitance between the earth connection that makes each phase in the changer system, can eliminate the superpotential imbalance of 3 phases, the maximum overvoltage during energy inhibition system is all.
In addition, according to the present invention,, can suitably suppress overvoltage by on the lead-out terminal of the power supply terminal of AC rotary machine or power converter, variable capacitor being set.
Description of drawings
Following brief description accompanying drawing.
Fig. 1 be the expression embodiment of the invention 1 changer system, do not implement the circuit structure diagram of the changer system of the countermeasure that overvoltage suppresses.
Fig. 2 is the sectional structure chart of 4 core cabtyre cables of the expression embodiment of the invention 1.
Fig. 3 is the figure of the measurement result of sharing voltage max of each coil that represents not implement the changer system of the countermeasure that overvoltage suppresses.
Fig. 4 is result's the figure of the whirler of the expression embodiment of the invention 1.
Fig. 5 is measurement result relatively the figure of the measurement result of sharing voltage max of each coil of the changer system of the embodiment of the invention 1 with the changer system of the countermeasure of not implementing the overvoltage inhibition.
Fig. 6 is the figure that first coil of the whirler of expression when making the capacitance variations of overvoltage suppression capacitor is shared the maximum measurement result of voltage.
Fig. 7 is the circuit structure diagram of other changer systems of the expression embodiment of the invention 1.
Fig. 8 is the circuit structure diagram of other changer systems of the expression embodiment of the invention 1.
Fig. 9 is the circuit structure diagram of the changer system of the expression embodiment of the invention 2.
Figure 10 is the sectional structure chart of the flat shape cable of 4 cores of the expression embodiment of the invention 2.
Figure 11 is the circuit structure diagram of the changer system of the expression embodiment of the invention 4.
Figure 12 is the stereogram of the cable of the expression embodiment of the invention 5.
Figure 13 is the structure chart in the cross section of the expression embodiment of the invention 5.
Embodiment
Fig. 1 (a) and Fig. 1 (b) be respectively the expression embodiment of the invention 1 changer system, do not implement the circuit structure diagram of the changer system of the countermeasure that overvoltage suppresses.
When deriving changer system of the present invention, use the changer system shown in Fig. 1 (b), analyze the overvoltage in the AC rotary machine that is accompanied by the switch of converter and produces.In the structure of Fig. 1 (b), connect by 3 phase service cables 2 between power-converting device (converter) 1 and the AC rotary machine (motor) 3.Described 3 phase service cables 2 are cross sectional shapes shown in Figure 2, are that supply lines Rc, Wc, Bc are the non-coaxial cable of 4 cores of same cable to earth connection Gc mutually with 3.For example by bare wire sectional area 2mm
24 core cabtyre cable 100m constitute.The maximum measurement result of sharing voltage of each coil of motor when Fig. 3 represents with such structure running converter.The whirler that uses in the mensuration of Fig. 3 becomes Δ line shown in Figure 4, and each is 4 coils mutually.In addition, locating among Fig. 3 be between the two ends of terminal (U phase: Um, U12, U34, U56, V phase: Vm, V12, V34, V56, W phase: Wm, W12, W34, W56) shown in Figure 4 (coiling of each coil begin and wind the line finish between).
As can be seen from Figure 3, the maximum of sharing voltage of each coil does not become equalization in 4 coils mutually at each, motor terminal becomes the coil that coiling beginning or coiling finish (for example Um-U12, U56-Wm etc., below be called first coil) the voltage of sharing that voltage max and coiling beginning, coiling finish all to become the coil (for example U12-U34, U34-U56) of motor terminal of sharing compare, become very big.This is in changer system, and the output waveform of converter becomes the rapid square wave that rises, so comprise a lot of radio-frequency components in the output voltage, for radio-frequency component, the rotation function resembles the phenomenon of observing the capacitor and producing.
As can be seen from Figure 3, in the circuit structure of Fig. 4, first coil that the maximum that first coil of V phase is shared voltage Vm-V12, Vm-W56 and U first coil are mutually shared voltage U m-U12, Um-V56, W phase is shared the maximum of voltage Wm-W12, Wm-U56 and is compared, and becomes high value more than 20%.First coil that first coil of this V phase is shared other phases of voltage ratio is shared the high phenomenon of voltage and is thought what the structure of service cable 2 caused.Promptly in the mensuration of Fig. 3, it is such that the cross-sectional configuration of the 4 core cabtyre cables that use as service cable 2 becomes Fig. 2, compares with the electrostatic capacitance between Rc (U mutually)-Gc, between Bc (W phase)-Gc, and the electrostatic capacitance between Wc (V phase)-Gc is little.4 core ethene cabtyre cable (bare wire sectional area 2mm of the structure of table 1 presentation graphs 1 (b) for example
2) Rc-Gc between, the measurement result of the electrostatic capacitance of the unit length between Bc-Gc, between Wc-Gc.
[table 1]
| Electrostatic capacitance (pF/m) | |
| Between Rc-Gc between Bc-Gc | 76 |
| Between Wc-Gc | 13 |
As known from Table 1,3 the electrostatic capacitances over the ground of 1 phase in mutually are mutually little with other.Therefore, because the difference of such electrostatic capacitance, first coil of 1 phase that certain is specific is shared first coil of other phases of voltage ratio and is shared the voltage height.
In view of the above, if can remove the asymmetry of electrostatic capacitance over the ground of 3 phases of supply lines, every supply lines and the electrostatic capacitance between the earth connection are equated, avoid first coil of certain 1 specific phase to share the phenomenon that voltage raises, just can eliminate the superpotential imbalance of 3 phases, can suppress the excessive overvoltage surge that only in certain specific phase of 3 phases, takes place.As a result, can all maximum overvoltage of inhibition system.
Below, the changer system of the embodiment of the invention 1 shown in the key diagram 1 (a).In Fig. 1, the power-converting device of PWM mode be voltage type PWM converter 13 phase output terminals Ui, Vi, Wi by comprise earth connection Gc with 3 mutually the 4 long core cabtyre cables 2 of supply lines Rc, Wc, Bc be connected on each Um of phase terminal portion, Vm, Wm of AC rotary machine (motor or generator) 3.
4 core cabtyre cables 2 adopt cross-sectional configuration shown in Figure 2, among each line Rc, Wc of 4 core cabtyre cables 2, Bc, the Gc, Rc is connected on the U phase terminal Ui of the U phase terminal Um of whirler 3 and converter 1, Wc is connected on the V phase terminal Vi of the V phase terminal Vm of whirler 3 and converter 1, Bc is connected on the W phase terminal Wi of the W phase terminal Wm of whirler 3 and converter 1, and Gc is connected on the earth terminal Gi of the earth terminal Gm of whirler 3 and converter 1.
In addition, between the Gm of earth terminal portion of the V of AC rotary machine 3 phase power supply terminal Vm, AC rotary machine 3, connect capacitor 4.
In the 4 core ethene cabtyre cables 2 of the structure of Fig. 1 that enumerates as an example in table 1 (b), the difference of the electrostatic capacitance of the 1m between Rc-Gc and between Bc-Gc and the electrostatic capacitance of the 1m between Wc-Gc is about 60pF.If the cable length of promptly establishing between converter 1 and the whirler 3 is L, then between the electrostatic capacitance between Wc-Gc and Rc-Gc and the electrostatic capacitance between Bc-Gc compare and be reduced to L * 60pF, for example when cable length was 100m, the electrostatic capacitance between Wc-Gc was little of 6000pF.
Therefore, in the changer system shown in Fig. 1 (a), the described value 6000pF that the value that is connected the capacitor 4 between power supply terminal Wm and the earth terminal Gm obtains for the difference according to electrostatic capacitance.
The measurement result of sharing voltage max of each coil of motor in the circuit structure of Fig. 5 presentation graphs 1 (a) and Fig. 1 (b).Be determined at the same condition of Fig. 3 under carry out, whirler 3 becomes Δ line shown in Figure 4, is each mutually 4 coil.Locate be terminal shown in Figure 4 (between the two ends of (U phase: Um, U12, U34, U56, V phase: Vm, V12, V34, V56, W phase: Wm, W12, W34, W56) (and the coiling of each coil begin and wind the line finish between).
As can be seen from Figure 5, in the circuit structure of Fig. 1 (b), first coil that the maximum that first coil of V phase is shared voltage Vm-V12, Vm-W56 and U first coil are mutually shared voltage U m-U12, Um-U56, W phase is shared the maximum of voltage Wm-W12, Wm-W56 and is compared, become high value more than 20%, but in the circuit structure of Fig. 1 (a), first coil of V phase share voltage suppress for U mutually, first coil of W phase shares the roughly the same value of voltage.By between the whirler power supply terminal of certain specific phase and earth terminal, connecting the capacitor of given electrostatic capacitance, can avoid first coil of certain specific phase to share the phenomenon that voltage raises, the superpotential imbalance of 3 phases can be eliminated, the excessive overvoltage surge that only in certain specific phase of 3 phases, produces can be suppressed.As a result, can all maximum overvoltage of inhibition system.
Fig. 6 represents bare wire sectional area 2mm
24 core ethene cabtyre cable length be 100m, first coil of measuring whirler 3 when making the capacitance variations of overvoltage suppression capacitor 4 is shared the peaked result of voltage.As can be seen from Figure 6, if the electric capacity of described overvoltage suppression capacitor 4 increases, first coil that then connects the phase of overvoltage suppression capacitor 4 is shared voltage decline, and first coil that does not connect the phase of overvoltage suppression capacitor 4 is shared the voltage increase.First coil that connects the phase of overvoltage suppression capacitor and the phase that is not connected the overvoltage suppression capacitor is shared voltage becomes the electrostatic capacitance of overvoltage suppression capacitor of roughly the same value at connection 100m bare wire sectional area 2mm
24 core ethene cabtyre cables the time, be 6000pF.The value that electrostatic capacitance between the Rc-Gc of this value and supply lines 2 from Fig. 1 (a), between Bc-Gc deducts the electrostatic capacitance between Wc-Gc is roughly consistent.At this moment, alleviate the load that the structure of becoming attached to whirler 3 provides most.Promptly by between the feeder terminal portion of whirler and earth terminal, connecting overvoltage suppression capacitor 4, thereby the electrostatic capacitance over the ground of each phase of supply lines 2 is for about equally, can avoid first coil of certain specific phase to share the phenomenon that voltage raises, can all maximum overvoltage of inhibition system.As a result,, in insulation, fully the time, can only capacitor be set,, just can obtain the high device of reliability so can pass through the low-cost apparatus structure at a place even at 3 overvoltage surges that lower same level takes place in mutually.
Specifically, comparing with 3 in mutually other, can connect between the whirler feeder terminal portion of 1 phase that the electrostatic capacitance between earth connection of the supply lines of service cable portion is minimum and the earth terminal portion and have the capacitor that is equivalent to supply lines the electrostatic capacitance of the difference value of the electrostatic capacitance mutually that electrostatic capacitance and the described electrostatic capacitance of high phase is minimum of the electrostatic capacitance between earth connection.But, connect equal supply lines to the electrostatic capacitance between earth connection during the electrostatic capacitance of the electrostatic capacitance of high phase and the difference value of the minimum electrostatic capacitance mutually of described electrostatic capacitance, the mensuration of the electrostatic capacitance that precision is good is necessary.Simple and easy, if connect 80～150% of the electrostatic capacitance be equivalent to described difference value, hope is the capacitor of electrostatic capacitance of the oblique line part (difference value 90～120%) of Fig. 6, just can avoid the phenomenon of sharing the voltage rising of specific phase roughly the electrostatic capacitance balance of each phase.
It should be noted that if implement the insertion of capacitor with above-mentioned mode, then not only first coil of certain specific phase is shared voltage, also can suppress the voltage to earth of the whirler feeder terminal portion of certain specific phase.
In addition, in the changer system of Fig. 1 (a), between Vm and Gm, connect overvoltage suppression capacitor 4, but this be because the cable power supply line Wc that connects with Vm other are mutually low to the earth connection capacity ratio, when the cable power supply line that connects with Um to the earth connection capacity ratio other when low mutually, between Um and Gm, connect the overvoltage suppression capacitor 4 that has with the electrostatic capacitance of described same decision.Equally, the cable power supply line that connects with Wm to the earth connection capacity ratio other when low mutually, between Wm and Gm, connect the overvoltage suppression capacitor 4 that has with the electrostatic capacitance of described same decision.
In addition, in the changer system of Fig. 1 (a), between the feeder terminal portion Vm of whirler and the Gm of earth terminal portion, connect overvoltage suppression capacitor 4, but when between the output terminal part Vi of power-converting device shown in Figure 7 (converter) and the Gi of earth terminal portion, inserting overvoltage suppression capacitor 4, also can obtain the effect of same inhibition overvoltage surge.
It should be noted that, in the changer system of Fig. 7, between Vi and Gi, connect overvoltage suppression capacitor 4, but this be because the cable power supply line Wc that connects with Vi other are mutually low to the earth connection capacity ratio, same with described embodiment, when the cable power supply line that connects with Ui to the earth connection capacity ratio other when low mutually, between Ui and Gi, connect the overvoltage suppression capacitor 4 have with the electrostatic capacitance of described same decision, when the cable power supply line that connects with Wi to the earth connection capacity ratio other when low mutually, between Wi and Gi, connect the overvoltage suppression capacitor 4 that has with the electrostatic capacitance of described same decision.
In addition, in the changer system of Fig. 1 (a), be illustrated in the situation that connects overvoltage suppression capacitor 4 between the feeder terminal portion Vm of whirler and the Gm of earth terminal portion, in changer system shown in Figure 7, be illustrated in the situation that connects overvoltage suppression capacitor 4 between the output terminal part Vi of power-converting device (converter) and the Gi of earth terminal portion, but can on the cable power supply line, connect overvoltage suppression capacitor 4.
For example, in cable power supply line one end (unlapped bare wire portion), when between to the cable power supply line of other mutually low phases of earth connection capacity ratio and earth connection, connecting overvoltage suppression capacitor 4, also can obtain the effect of same inhibition overvoltage surge.
In addition, as shown in Figure 8,2 cables of connecting are at middle interconnecting piece, the cable power supply line to the cable power supply line of other mutually low phases of earth connection capacity ratio and earth connection between when inserting overvoltage suppression capacitor 4, also can obtain the effect of same inhibition overvoltage surge.At this moment, the cable length of 2 cables of series connection is no matter identical when long at both, or any one party is when long, can obtain same effect.
It should be noted that, in the changer system of Fig. 8, between Wc and Gc, connect overvoltage suppression capacitor 4, but this be because cable power supply line Wc other are mutually low to the earth connection capacity ratio, same with described embodiment, when cable power supply line Rc to the earth connection capacity ratio other when low mutually, between Rc and Gc, connect the overvoltage suppression capacitor 4 have with the electrostatic capacitance of described same decision, when cable power supply line Bc to the earth connection capacity ratio other when low mutually, between Bc and Gc, connect the overvoltage suppression capacitor 4 that has with the electrostatic capacitance of described same decision.
In addition, in described embodiment, as the cable 2 that connects converter 1 and whirler 3, use 4 core cabtyre cables, but when being to use the non-coaxial cable that earth connection and 3 phase supply lines are made of different heart yearns respectively, produce effect, be not limited to 4 core cabtyre cables, for the supply lines and the unbalanced any non-coaxial cable of the electrostatic capacitance between the earth connection of cable, the manner is all effective.Be not limited to 4 cores in addition,, also can use for having and earth connection, the 3 non-coaxial cable more than 4 cores of the heart yearn that connects of supply lines mutually.
Fig. 9 is the circuit structure diagram of the changer system of the expression embodiment of the invention 2.Situation when the flat shape cable of 4 cores with cross-sectional configuration shown in Figure 10 used as the converter 1 of Fig. 9 and the service cable between the whirler 32 is described.As shown in figure 10, supply lines when the diametric end of length of the flat shape cable of 4 cores is earth connection (Gc), when 3 remaining supply lines are respectively Hc, Ic, Jc, each supply lines to Jc maximum in the electrostatic capacitance of earth connection, next is Ic, and to the electrostatic capacitance minimum of ground wire is Hc.
In changer system shown in Figure 9, the power supply terminal line of each supply lines of the lead-out terminal of each phase of converter 1, cable 2, each phase of whirler 3 is Ui-Hc-Um, Vi-Ic-Vm, Wi-Jc-Wm.At this moment, in flat shape cable, connect capacitor 5,6 respectively in the U phase of electrostatic capacitance minimum over the ground, between the whirler feeder terminal portion of electrostatic capacitance second is little over the ground V phase and the whirler earth terminal portion.The electrostatic capacitance of this capacitor 5,6 be respectively equal Jc to earth connection electric capacity deduct Hc the value that earth connection electric capacity is obtained, Jc earth connection electric capacity is deducted the electric capacity of the value that earth connection electric capacity is obtained of Ic, perhaps briefly, be respectively Jc to earth connection electric capacity deduct Hc the value that earth connection electric capacity is obtained, Jc earth connection electric capacity is deducted the electrostatic capacitance (wishing 90～120% electrostatic capacitance of difference value) of 80%～150% scope of the value that earth connection electric capacity is obtained of Ic.
By connecting such capacitor 5,6 in the whirler portion of terminal, can avoid the excessive generation of sharing voltage of specific phase, can reduce all overvoltage surges of system.
In addition, in described embodiment, in cable portion, the supply lines of electrostatic capacitance minimum is the U phase over the ground, the electrostatic capacitance second little supply lines is the V phase over the ground, when but no matter which each supply lines be connected with,, just can obtain equal effect if connect capacitor respectively with given electrostatic capacitance in the phase of electrostatic capacitance minimum over the ground, between the whirler feeder terminal portion of electrostatic capacitance second is little over the ground phase and the whirler earth terminal portion.
In addition, in described embodiment, between the phase and earth terminal portion of the minimum of electrostatic capacitance over the ground of the feeder terminal portion of motor, connect overvoltage suppression capacitor 5,6 respectively between electrostatic capacitance second is little over the ground phase and the earth terminal portion, but, also can obtain the effect of same inhibition overvoltage surge between the phase and earth terminal portion of the minimum of electrostatic capacitance over the ground of the output terminal part of power-converting device (converter), inserted the overvoltage suppression capacitor respectively at 5,6 o'clock between electrostatic capacitance second is little over the ground phase and the earth terminal portion.
In addition, an end or cable pars intermedia at the cable power supply line of changer system, between the phase and earth connection of electrostatic capacitance minimum over the ground, inserted the overvoltage suppression capacitor respectively at 5,6 o'clock between electrostatic capacitance second is little over the ground phase and the earth connection, also can obtain the inhibition effect of same overvoltage surge.
In addition, in described embodiment, as the cable 2 that connects converter 1 and motor 3, use the flat shape cable of 4 cores, but when the non-coaxial cable that uses earth connection and 3 phase supply lines to constitute by different heart yearns respectively, also effective, be not limited to the flat shape cable of 4 cores, for the supply lines and the unbalanced any non-coaxial cable of the electrostatic capacitance between the earth connection of cable, the manner is effective.In addition, be not limited to 4 cores,, also can use for having and earth connection, the 3 non-coaxial cable more than 4 cores of the heart yearn that connects of supply lines mutually.
In described embodiment 1,2, overvoltage suppression capacitor 4,5,6 is outer to be connected between whirler feeder terminal portion and the earth terminal portion or between power converter (converter) output terminal part and the earth terminal portion or between supply lines and the earth connection, but also can in whirler power supply terminal platform or converter, set in advance the type variable capacitor, thereby for any cable length, can simply adjust electrostatic capacitance, suppress overvoltage.At this moment, if know in advance as cable, use 4 core cabtyre cables, just wish between the Vm and earth terminal of whirler, or be connected the type variable capacitor between the Vi of converter and earth terminal, but 4 core cabtyre cables not only, when each phase such as supposition 4 cores flat shape cable to the electrostatic capacitance between earth connection all during the use of different cables, between the power supply terminal and earth terminal of any 2 phases of whirler, or between the lead-out terminal of any 2 phases of converter and the earth terminal type variable capacitor is set respectively, thereby when using such cable, also can suppress overvoltage.At this moment, when stube cable, can stube cable supply lines-ground connection voltage between lines be the supply lines of minimum phase and the supply lines of next to the lowest phase at the motor power supply terminal that the type variable capacitor is set or converter output terminal.
In addition, can connect the type variable capacitor between 3 mutually whole whirler power supply terminals and earth terminal or between 3 mutually whole converter output terminal and the earth terminal.At this moment, when as 4 core cabtyre cables, when using the cable that only electrostatic capacitance between certain 1 phase cable power supply line-earth connection is low, the electrostatic capacitance value that is connected the high type variable capacitor of going up mutually of electrostatic capacitance between cable power supply line-earth connection is set at 0pF, or the little electrostatic capacitance value of the electrostatic capacitance between the comparison earth connection following little electrostatic capacitance value of 10pF for example, the electrostatic capacitance value that is connected the low type variable capacitor of going up mutually of electrostatic capacitance between cable power supply line-earth connection is set at 3 mutually whole supply lines and electrostatic capacitances between the earth connection and becomes equal value.
In addition, as the flat shape cable of 4 cores, use each phase to all different cable of the electrostatic capacitance between earth connection the time, the electrostatic capacitance that is connected the highest type variable capacitor of going up mutually of electrostatic capacitance between cable power supply line-earth connection is set at 0pF, or, be connected the minimum phase of electrostatic capacitance between cable power supply line-earth connection frequently to the little electrostatic capacitance value of the electrostatic capacitance between the earth connection little electrostatic capacitance value below the 10pF magnitude for example, and the electrostatic capacitance of the next to the lowest type variable capacitor of going up mutually is set at 3 mutually whole supply lines and electrostatic capacitances between the earth connection and becomes equal value.
As the variable range of the electrostatic capacitance of type variable capacitor, be connected cable length on the power conversion system and difference according to supposition.The lower limit of wishing variable range is for below the number 10pF, and higher limit is used in the power conversion system of the cable of the longest Lm in supposition, wishes for more than L * Δ C (3 phase supply lines of Δ C:1m cable to electrostatic capacitance between earth connection poor).On the typical case, Δ C＜100pF, so for example use in the power conversion system of the cable of the longest 100m in supposition, the higher limit of variable range is more than the 10000pF.
Embodiment 4
Figure 11 is the circuit structure diagram of the changer system of the expression embodiment of the invention 4.In Figure 11,3 cables 2 of 3 phase output terminals Ui of pwm converter 1, Vi, the Wi equal in length by comprising earth connection Gc are connected in each phase terminal portion of AC rotary machine 3.For example when using 4 core cabtyre cables, the cross-sectional configuration that is constructed to Fig. 2 of this cable.At this moment, as shown in figure 11, the supply lines of 3 cables of interconnection equal in length, thereby as Ui-Rc-Wc-Bc-Um, Vi-Wc-Bc-Rc-Vm, Wi-Bc-Rc-Wc-Wm, 3 mutually whole supply lines only use 1 Wc (in the cable power supply line, the line low to the electrostatic capacitance of earth connection) in 3 cables.By such connection, each electrostatic capacitance between earth connection mutually that connects the supply lines of converter and whirler becomes equal, similarly to Example 1, can avoid first coil of certain specific phase to share the phenomenon that voltage raises, can all maximum overvoltage of inhibition system.
Figure 12 is the stereogram of expression as the cable of the supply lines use of the changer system of the embodiment of the invention 5.Cable shown in Figure 12 is the 4 core cables that the structure of 3 supply lines is set around earth connection.If adopt such structure, then to become Figure 13 such in the cross section of the arbitrary portion of cable, and the electrostatic capacitance between 3 phase supply lines and the earth connection all equates for any phase.By in the supply lines of changer system, using the cable of structure like this, each electrostatic capacitance between earth connection mutually that connects the supply lines of converter and whirler becomes equal, similarly to Example 1, can avoid first coil of certain specific phase to share the phenomenon that voltage raises, can all maximum overvoltage of inhibition system.
Claims (6)
1. a changer system is characterized in that: comprising: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, the earth terminal portion that is connected to described whirler and described whirler 31 in the feeder terminal portion be mutually or the capacitor between the feeder terminal portion of 2 phases mutually.
2. a changer system is characterized in that: comprising: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, 1 in the earth terminal portion that is connected to described power converter and the 3 phase output terminals portions of described power converter are mutually or the capacitor between the output terminal part of 2 phases.
3. a changer system is characterized in that: comprising: power converter; 3 cross streams whirlers; Connect described power converter and described 3 cross streams whirlers, and make earth connection with 3 mutually supply lines be the non-coaxial cable of at least 4 cores of same cable; For make between described 3 phase supply lines and the described earth connection electrostatic capacitance 3 mutually in for about equally, be connected to described earth connection and described 31 in the supply lines be mutually or the capacitor between the supply lines of 2 phases mutually.
4. according to any 1 described changer system among the claim 1-3, it is characterized in that: described capacitor is connected in the cable portion the electrostatic capacitance between earth connection than other mutually low going up mutually, has the electrostatic capacitance that is equivalent to the difference value of the low electrostatic capacitance mutually of the electrostatic capacitance of the highest phase of the electrostatic capacitance between earth connection and described electrostatic capacitance.
5. according to any 1 described changer system among the claim 1-3, it is characterized in that: described capacitor is connected in the cable portion the electrostatic capacitance between earth connection than other mutually low going up mutually, has the electrostatic capacitance that is equivalent to the 80-150% of the difference value of the low electrostatic capacitance mutually of the electrostatic capacitance of the highest phase of the electrostatic capacitance between earth connection and described electrostatic capacitance.
6. changer system is characterized in that comprising:
Power converter;
3 cross streams whirlers;
Earth connection with 3 mutually supply lines be 3 non-coaxial cables same cable, at least 4 cores, equal in length, wherein
In series dispose above-mentioned 3 non-coaxial cables, with above-mentioned 3 non-coaxial cables above-mentioned power converter and above-mentioned 3 cross streams whirlers are coupled together, wherein above-mentioned 3 non-coaxial cables are connected to by between each non-coaxial cable, changing each phase supply lines configuration and connect, and make between above-mentioned 3 phase supply lines and the above-mentioned earth connection electrostatic capacitance 3 mutually in about equally, make 3 in each non-coaxial cable mutually the supply lines of each phase with respect to the configuration change that is arranged on the earth connection in this non-coaxial cable.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004329184 | 2004-11-12 | ||
| JP2004329184 | 2004-11-12 | ||
| JP2005221037 | 2005-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1773839A CN1773839A (en) | 2006-05-17 |
| CN100440722C true CN100440722C (en) | 2008-12-03 |
Family
ID=36760647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101194217A Expired - Fee Related CN100440722C (en) | 2004-11-12 | 2005-11-11 | Inverter system, AC ratory machine and electric inverter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5201164B2 (en) |
| CN (1) | CN100440722C (en) |
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| JPH0236795A (en) * | 1988-07-22 | 1990-02-06 | Mitsubishi Electric Corp | Device for prevention of electric leakage of inverter |
| CN1126903A (en) * | 1994-09-27 | 1996-07-17 | 富士电机株式会社 | PWM converter |
| JPH09294381A (en) * | 1996-04-25 | 1997-11-11 | Hitachi Ltd | Input/output non-insulating power converter |
| JPH10135681A (en) * | 1996-10-29 | 1998-05-22 | Fuji Electric Co Ltd | Variable speed driving device |
| CN1360392A (en) * | 2000-12-19 | 2002-07-24 | 富士电机株式会社 | Noise reducing device for electric power conversion device |
| JP2003235269A (en) * | 2002-02-08 | 2003-08-22 | Fuji Electric Co Ltd | Noise reducing apparatus for power converter |
| CN1700577A (en) * | 2004-05-21 | 2005-11-23 | 三洋电机株式会社 | Inverter device for automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5951208B2 (en) * | 1976-12-17 | 1984-12-12 | 住友電気工業株式会社 | Single core power cable twisting and cross bond installation method |
| JPS61109424A (en) * | 1984-10-31 | 1986-05-27 | 昭和電線電纜株式会社 | Cross bonding grounding system |
| JPH058747Y2 (en) * | 1987-10-22 | 1993-03-04 | ||
| JP3417360B2 (en) * | 1999-09-02 | 2003-06-16 | 神鋼電機株式会社 | Testing equipment |
| JP4085372B2 (en) * | 2002-01-15 | 2008-05-14 | 日本精工株式会社 | Signal cable for resolver |
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- 2005-11-11 CN CNB2005101194217A patent/CN100440722C/en not_active Expired - Fee Related
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236795A (en) * | 1988-07-22 | 1990-02-06 | Mitsubishi Electric Corp | Device for prevention of electric leakage of inverter |
| CN1126903A (en) * | 1994-09-27 | 1996-07-17 | 富士电机株式会社 | PWM converter |
| JPH09294381A (en) * | 1996-04-25 | 1997-11-11 | Hitachi Ltd | Input/output non-insulating power converter |
| JPH10135681A (en) * | 1996-10-29 | 1998-05-22 | Fuji Electric Co Ltd | Variable speed driving device |
| CN1360392A (en) * | 2000-12-19 | 2002-07-24 | 富士电机株式会社 | Noise reducing device for electric power conversion device |
| JP2003235269A (en) * | 2002-02-08 | 2003-08-22 | Fuji Electric Co Ltd | Noise reducing apparatus for power converter |
| CN1700577A (en) * | 2004-05-21 | 2005-11-23 | 三洋电机株式会社 | Inverter device for automobile |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1773839A (en) | 2006-05-17 |
| JP5201164B2 (en) | 2013-06-05 |
| JP2010183836A (en) | 2010-08-19 |
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