CN204349789U - AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus - Google Patents

AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus Download PDF

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CN204349789U
CN204349789U CN201520094792.3U CN201520094792U CN204349789U CN 204349789 U CN204349789 U CN 204349789U CN 201520094792 U CN201520094792 U CN 201520094792U CN 204349789 U CN204349789 U CN 204349789U
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impedance
inductance
passive
electric capacity
filter
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肖芳
戈宝军
陶大军
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Abstract

AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, belong to AC Motor Driver Control System and field of electromagnetic compatibility, the utility model is in order to suppress common-mode voltage in AC Driving System and shaft current.The utility model comprises AC power, rectifier, inverter, long cable and motor, AC power after rectifier, inverter, the ac converter output of inverter by long cable for motor provides working power; After dc-link capacitance C1, C2 series connection, be connected in parallel on the DC bus of rectifier output, the tie point of dc-link capacitance C1, C2 is the clamper mid point of this DC bus; Source filter is provided with between inverter and long cable; Between rectifier and AC power, passive filter is set; The clamper instruction output end of active filter is connected with the clamper mid point of DC bus, and the interference instruction output end that disappears of passive filter is connected with the neutral point of motor.

Description

AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus
Technical field
The utility model relates to AC Motor Driver Control System and field of electromagnetic compatibility, specifically a kind of suppress common-mode voltage and shaft current in AC Driving System passive/active power filtering restraining device.
Background technology
Electromagnetic compatibility (EMC) is an important research field that is electric, electronic engineering, and electromagnetic interference is the problem that people find already, but modern age this new disciplines of electromagnetic compatibility formed.International Electrotechnical Commission is defined as this: equipment or system can normally work in its electromagnetic environment, and not to the ability of the electromagnetic disturbance that anything formation in this environment can not be born.
Emerging in multitude and extensively popularizing along with electronic product, computer and household electrical appliance, the extensive use of particularly relevant with power electronic device in recent years converting means, makes electromagnetic noise interference day by day serious, and has become a kind of public hazards.The normal work of this electromagnetic noise not only other electronic equipments that severe jamming is contiguous, but also threaten the health and safety of the mankind.Meanwhile, occurred again a large amount of high sensitivity equipment very sensitive to electromagnetic interference in the world, and the device of these sensitivities is just play more and more important role.As electronics Ore-controlling Role, data processing equipment etc.Therefore reduce the electromagnetic interference strength of electronic equipment, raising Electro Magnetic Compatibility has become the problem that current electron trade is paid close attention to.
In common electromagnetic environment, how to make electronic system and the interference-free impact of equipment and normal work is consistently technical problem in the urgent need to address, and this point studies the aim of electromagnetic compatibility just.For this reason, in order to the Electro Magnetic Compatibility of specification electric appliance and electronic product, construct a good electromagnetic environment, reduce various mutual interference and electromagnetic pollution, about international organization and country define electromagnetic compatibility quality pressure standard to electronics, electric product, as the CISPR standard of international wireless electricity special committee, the EN series standard of European Union, US Federal Communication Committee FCC series standard etc.And European Union's regulation is from January, 1996, the electric appliance and electronic product of all input EU markets must meet the requirement of EMC standard, otherwise can not enter EU market circulation.Also there are many tissues in China, is being engaged in the work in about EMC, as the national radio interference committee, and the electromagnetic compatibility committee of Chinese power supply association etc., and the national EMC standard of China is also progressively being implemented.But because the industrial foundation in past is weaker, electromagnetic environmental pollution does not fully expose, not enough to the research understanding of electromagnetic compatibility, therefore domestic EMC research is also nowhere near.Electromagnetic compatibility has been a subject of close concern to each other with national economy, national defense construction and people's lives as can be seen here.
After entering for 20th century, the motor driven systems applied in modern industry has been controlled to develop into by original simple power frequency supply Direct driver and has adopted the power inverter of pulse modulation technology (PWM) to drive.Although its performance obtains and significantly improves, but due to the reason of PWM pulse width modulation controlled mode, device for power switching in power inverter is operated on off state, the electricity waveform exported is discontinuous, and there is larger du/dt and di/dt, this makes voltage, electric current all containing abundant high order harmonic component.So the electromagnetic noise energy that these harmonic waves have will form electromagnetic interference, the normal work of influential system self and periphery electrical system by near-field coupling and far field coupling.Generally to adopt IGBT device now, when switching frequency is 2kHz ~ 20kHz, just can up to 2kA/ μ s, and now the stray inductance of 30nH just can motivate the interference voltage of 60V, its electromagnetic interference strength of causing is very big as can be seen here.Simultaneously power inverter produces high frequency common mode voltage, motor also can be made to occur negative issues such as shaft voltage, shaft current and common mode current (leakage current) be excessive.And on the other hand, AC machine drive system is often in some application of special occasions such as precision optical machinery processing, national defence tip device, its Conducted Electromagnetic Interference produced both had had influence on the stable operation of system itself, had influence on again the safe operation of other system.Therefore, the Conducted Electromagnetic Interference of AC machine drive system has become the acute problem perplexing many system stability safe operations, some practical ways must be proposed, the Conducted Electromagnetic Interference of AC machine drive system in practical application is effectively suppressed.
To the common-mode voltage produced due to electromagnetic interference in AC Driving System and the negative effect such as shaft current, from the angle of excision interferencing propagation approach, electromagnetic interface filter is very effective suppression means, the filter of correct design can make system EMI emissive porwer be reduced to below EMC standard limited value, make electric equipment and system realize electromagnetic compatibility, reach the requirement of international electromagnetic compatibility standard.
Summary of the invention
The utility model object is that electromagnetic interference causes motor driven systems reliability decrease, failure rate increases, electrical machinery life reduces in order to solve the common-mode voltage and shaft current etc. that existing AC Driving System produces in running, the problem of electromagnetic compatibility standard cannot be reached, provide a kind of passive/active suppressing apparatus, suppress the common-mode voltage in AC Driving System and shaft current.In order to reach good effect, consider active and passive filtering suppression technology, the mechanism of production of interference source and electromagnetic interference propagation path in coupling system, appropriate design filter topological structure, provide the process of whole parameter designing, final purpose is to make AC machine drive system reach the requirement of electromagnetic compatibility standard.
AC Driving System common-mode voltage described in the utility model and shaft current passive/active suppressing apparatus, comprise AC power, rectifier, inverter, long cable and motor, the alternating current output of AC power is connected with the ac input end of rectifier, the DC output end of rectifier is connected with the direct-flow input end of inverter, the ac converter output of inverter by long cable for motor provides working power; After dc-link capacitance C1, C2 series connection, be connected in parallel on the DC bus of rectifier output, the tie point of dc-link capacitance C1, C2 is the clamper mid point of this DC bus;
Also include source filter and passive filter; The input of active filter connects the inversion ac output end of inverter, and the output of active filter is connected with motor by long cable; The input of passive filter connects the ac input end of rectifier, and the output of passive filter connects the alternating current output of AC power;
The clamper instruction output end of active filter is connected with the clamper mid point of DC bus, and the interference instruction output end that disappears of passive filter is connected with the neutral point of motor.
Advantage of the present utility model: AC Driving System common-mode voltage described in the utility model and shaft current passive/active suppressing apparatus adopts two electromagnetic interface filter topological structures, be the improvement carried out on the basis of traditional active filter, consider active filter and passive filter advantage separately designs.Active filter for suppressing the common-mode voltage between AC Driving System inverter outlet side and motor, and then suppresses motor shaft voltage, shaft current.The effect of passive filter has two: one to be common-mode voltage for suppressing AC Driving System rectifier to exchange input side, reduces the Conducted Electromagnetic Interference of whole system further; Two is that electrical network is polluted in the interference preventing from being produced by system.The utility model proposes by two filter constructions form passive/acting in conjunction of active filter topology, suppress the common-mode voltage, shaft current, leakage current etc. in AC Driving System, entirety reaches system conductive electromagnetic interference and does not exceed standard.
The utility model, compared to conventional AC drive system Conducted Electromagnetic Interference suppressing method, is not limited to the filter topologies adopting separately a kind of form.In systems in which, larger on motor impact is the common-mode voltage of inverter outlet side, and the shaft voltage and shaft current etc. that affect electrical machinery life are all caused by common-mode voltage, adopt herein the advantage of active filter have two: one be do not need large volume (due to the fundamental voltage on main circuit and electric current large) energy-storage travelling wave tube carry out filtering ripple energy; Two is in the frequency range of conducted interference, noise signal frequencies is higher, if it is larger to adopt passive filter to carry out compensate for poor mode noise difficulty, not only can increase the cost of system, and effect is also bad, so the mode of active power filtering suppresses the common-mode noise of electric system proper, the neither normal operation of influential system originally when power frequency, effectively can suppress again the conducted interference intensity of system.The connected applications of active and passive filter in circuit, the effect that two filters combine is better than and is used alone active filter.When considering filter connected mode, access rectifier and exchange input side, DC bus clamper mid point, motor side, generator neutral point, so while suppression Conducted Electromagnetic Interference, also eliminate some negative effects that system produces, comprise common-mode voltage, motor shaft voltage, shaft current, leakage current etc.
Accompanying drawing explanation
Fig. 1 be AC Driving System common-mode voltage described in the utility model and shaft current passive/theory diagram of active suppressing apparatus;
Fig. 2 is the physical circuit figure of active filter;
Fig. 3 is the physical circuit figure of passive filter;
Fig. 4 is the common-mode voltage and shaft voltage curve chart that adopt conventional AC drive system to measure; Wherein curve A is common-mode voltage curve chart, and curve B is shaft voltage curve chart;
Fig. 5 is the shaft current and leakage current curve chart that adopt conventional AC drive system to measure; Wherein curve A is shaft current curve chart, and curve B is leakage current curve chart;
Fig. 6 adopts conventional AC drive system Conducted Electromagnetic Interference launching curve figure;
Fig. 7 be adopt AC Driving System common-mode voltage described in the utility model and shaft current passive/common-mode voltage of active suppressing apparatus and shaft voltage curve chart; Wherein curve A is common-mode voltage curve chart, and curve B is shaft voltage curve chart;
Fig. 8 be adopt AC Driving System common-mode voltage described in the utility model and shaft current passive/shaft current of active suppressing apparatus and leakage current curve chart; Wherein curve A is shaft current curve chart, and curve B is leakage current curve chart;
Fig. 9 be adopt AC Driving System common-mode voltage described in the utility model and shaft current passive/the Conducted Electromagnetic Interference launching curve figure of active suppressing apparatus.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, AC Driving System common-mode voltage described in present embodiment and shaft current passive/active suppressing apparatus, comprise AC power 1, rectifier 2, inverter 3, long cable 4 and motor 5, the alternating current output of AC power 1 is connected with the ac input end of rectifier 2, the DC output end of rectifier 2 is connected with the direct-flow input end of inverter 3, the ac converter output of inverter 3 by long cable 4 for motor 5 provides working power; After dc-link capacitance C1, C2 series connection, be connected in parallel on the DC bus of rectifier 2 output, the tie point of dc-link capacitance C1, C2 is the clamper mid point of this DC bus;
Also include source filter 6 and passive filter 7; The input of active filter 6 connects the inversion ac output end of inverter 3, and the output of active filter 6 is connected with motor 5 by long cable 4; The input of passive filter 7 connects the ac input end of rectifier 2, and the output of passive filter 7 connects the alternating current output of AC power 1;
The clamper instruction output end of active filter 6 is connected with the clamper mid point of DC bus, and the interference instruction output end that disappears of passive filter 7 is connected with the neutral point of motor 5.
In present embodiment, in AC Driving System, rectifier 2 and inverter 3 are when controlling electric energy and converting, the switching device turned on and off at a high speed can cause voltage and current at short notice transition to occur, the high frequency common mode voltage produced and high frequency differential mode voltage, form electromagnetic interference, but also very high shaft voltage can be induced on machine shaft, produce shaft current and leakage current.
In present embodiment, active filter 6 input is connected to the output of inverter 3, an output part is connected with motor 5, output is drawn a connecting terminals in addition and is connected to DC bus clamper mid point, the object of this connected mode has two: one to be high frequency common mode voltage for suppressing between inverter 3 outlet side and motor 5, and then suppresses the negative effect such as motor bearing current, leakage current that caused by common-mode voltage.The input of passive filter 7 is connected to the input of rectifier 2, a part for output is connected with electrical network, draw the neutral point that a connecting terminals is connected on motor 5 in addition, the high frequency common mode voltage of input side is exchanged for eliminating AC Driving System, the Conducted Electromagnetic Interference of further reduction whole system, and electrical network is polluted in the interference that anti-locking system produces.
Embodiment two: present embodiment is described below in conjunction with Fig. 2, active filter 6 comprises three-phase four winding transformer T, impedance Z 1, impedance Z 2, impedance Z 3, impedance Z 4, transistor VT 1, transistor VT 2, direct voltage source U1 and direct voltage source U2;
The former limit of three-phase four winding transformer T has vice-side winding L 1, vice-side winding L 2, vice-side winding L 3with former limit winding L 4; Vice-side winding L 1, vice-side winding L 2with vice-side winding L 3same Name of Ends U, V, W connect the inversion ac output end of inverter 3; Vice-side winding L 1, vice-side winding L 2with vice-side winding L 3different name end U 1, V 2, W 3be connected with motor 5 by long cable 4; The no-load voltage ratio of three-phase four winding transformer T is n;
Complementary transistor VT 1with transistor VT 2inverse parallel connects, composition push-pull type emitter follower;
Transistor VT 1base stage and transistor VT 2the common node of base stage connects impedance Z simultaneously 1one end, impedance Z 2one end, impedance Z 3one end and impedance Z 4one end, impedance Z 1the other end connect secondary winding L 1same Name of Ends U, impedance Z 2the other end connect secondary winding L 2same Name of Ends V, impedance Z 3the other end connect secondary winding L 3same Name of Ends W, impedance Z 4the other end connect ground PE; Impedance Z 1, impedance Z 2, impedance Z 3for Y access node structure.
Transistor VT 1emitter and transistor VT 2the common node of emitter connects former limit winding L 4same Name of Ends, former limit winding L 4different name end O ' connect the negative pole of direct voltage source U1 and the negative pole of direct voltage source U2 simultaneously; The positive pole of direct voltage source U1 connects transistor VT 1collector electrode, the positive pole of direct voltage source U2 connects transistor VT 2collector electrode.
Impedance Z 1, impedance Z 2and impedance Z 3resistance is equal.
Direct voltage source U1 and the equal value of direct voltage source U2 wherein U dfor DC bus-bar voltage.
When traditional active filter is applied, due to the transistor that is difficult to find rated voltage more than 400V, which limits the range of application of active filter, but in the present embodiment, transistor VT 1and VT 2emitter follower by an independently DC power supply, have nothing to do, so complementary transistor VT with the input power of inverter 3 1and VT 2pressure drop can not more than U d.Like this, this active filter 6 just can be applied on the induction machine that rated voltage is 460V or higher.This to the transistor of complementation by independently DC power supply power supply, and the common mode transformer T utilizing turn ratio to be 1:n, parameter n are the turn ratio of any secondary one phase winding to the 4th mutually former limit winding.The exciting current of common mode transformer T is by two complementary transistor VT 1and VT 2the push-pull type emitter follower of composition provides, and it increases according to parameter n, considers the rated current of complementary transistor simultaneously.
In active filter 6, the output voltage of emitter follower is added to the output of inverter 3 by common mode transformer T, so common-mode voltage testing circuit is by impedance Z 1~ Z 4composition, Z 1, Z 2, Z 3resistance value is equal, and and Z 4resistance value ratio be 1/3.
The conducted electromagnetic interference noise of inverter 3 is mainly produced by the common-mode voltage of inverter 3, so the common-mode voltage reducing motor side just can reduce electromagnetic interference noise significantly, the common-mode voltage that the induced potential utilizing the annexation of common mode transformer T Motor Winding Same Name of Ends that common mode transformer T secondary is produced and inverter 3 generate is cancelled out each other.Because common-mode signal is all over the ground, three winding secondary can be equivalent to a phase winding, so three-phase four winding common mode transformer T can be equivalent to two windings to carry out when analyzing former secondary electricity relation.Along with the elimination of common-mode voltage, the shaft current that motor 5 produces reduces greatly, and the Main Ingredients and Appearance of conducted interference is exactly the leakage current that inverter 3 produces, and this electric current can be compensated by the circuit be made up of common mode transformer T and push-pull circuit.
Embodiment three: present embodiment is described below in conjunction with Fig. 3, passive filter 7 comprises inductance L 5, inductance L 6, inductance L 7, electric capacity C3, electric capacity C4, electric capacity C5 and resistance R;
Inductance L 5, inductance L 6, inductance L 7one end A, B, C of these three inductance connect the ac input end of rectifier 2, inductance L 5, inductance L 6, inductance L 7the other end A of these three inductance 1, B 1, C 1connect the alternating current output of AC power 1;
The one end of the common node contact resistance R that one end of electric capacity C3, electric capacity C4, electric capacity C5 links together, the other end M ' of resistance R is connected to the neutral point M of motor 5; The other end of electric capacity C3, electric capacity C4, electric capacity C5 connects the other end A of three inductance respectively 1, B 1, C 1.
Inductance L 5, inductance L 6and inductance L 7induction reactance equal.
The capacitance of electric capacity C3, electric capacity C4 and electric capacity C5 is equal.
Embodiment four: present embodiment is described below in conjunction with Fig. 1 to Fig. 9, present embodiment provide AC Driving System common-mode voltage and shaft current passive/the parameter determination mode of active suppressing apparatus.
In the process being designed with source filter 6, current compensation part will carefully be chosen, and the transistor of design suitable parameter and common mode transformer T, especially transistor, require broadband, high-gain and low-loss.In addition, to take measures from the structural manufacturing process of current detecting common mode transformer T, reduce the stray capacitance in winding as far as possible.Rule of thumb, generally to get 10 effectiveness comparison good for the no-load voltage ratio n of common mode transformer T.
Common-mode voltage in active filter 6 detects impedance Z 1~ Z 4adopt the form of resistance and capacitances in series, to avoid producing resonance phenomena, suppose that its resistance is R z1, electric capacity is C z1.Active filter 6, mainly for suppressing system common-mode voltage, so in the design process, needs the transfer function IL (s) inserting it into loss to have low-pass characteristic.Its main frequency of common-mode voltage produced due to inverter 3 all concentrates on switching frequency and integral multiple thereof, so the resonance frequency of active filter 6 must much smaller than the switching frequency 2 π f of inverter 3 s.Rule of thumb with experiment, get C z1=180pF.Its inductance, resistance can calculate with following formula:
L 4 > > 1 3 β C z 1 ( 2 π f s ) 2 - - - ( 1 )
L 1 > > L 4 k 2 - - - ( 2 )
R z = 2 ζ 3 β L 4 C Z 1 - - - ( 3 )
In formula, ζ is damping coefficient, and k is coupling coefficient, and β is the alternating current gain of transistor.
Set up below three phase rectifier-inversion-electric system verify the AC Driving System common-mode voltage that the utility model proposes and shaft current passive/active suppressing apparatus to the inhibition of the Conducted Electromagnetic Interference produced in AC Driving System, comprise the suppression to common-mode voltage, motor shaft voltage, shaft current and leakage current.
As shown in Figure 4, as shown in Figure 5, system conductive electromagnetic interference frequency spectrum as shown in Figure 6 for the shaft current of measurement and leakage current curve for the common-mode voltage not using the AC Driving System of restraining device of the present utility model to measure and shaft voltage curve.As can be seen from Figure 4, in AC Driving System, when adopting pwm power converter to drive, always there is the common-mode voltage of non-zero in motor side, from Fig. 5 middle (center) bearing electric current and the peak of leakage current and the position corresponding relation of beating of common mode voltage level, motor side high frequency shaft current and leakage current are caused by device high frequency common mode voltage, can find out from Fig. 6, the Conducted Electromagnetic Interference (150Hz ~ 30MHz) in Conducted Electromagnetic Interference band limits that system produces is all below standard.
Access the utility model AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus after, the common-mode voltage that measurement obtains and shaft voltage curve are as shown in Figure 7, as shown in Figure 8, Conducted Electromagnetic Interference frequency spectrum as shown in Figure 9 for shaft current and leakage current curve.Comparison diagram 4 and Fig. 7, Fig. 5 and Fig. 8 can find out respectively: after employing the utility model device, system common-mode voltage, shaft voltage, shaft current and leakage current have obvious elimination; Comparison diagram 6 and Fig. 9, the Conducted Electromagnetic Interference amplitude entirety that now system produces has the decline of about 30 ~ 40dB, within the scope of the Emission Limits all specified in standard EN 55011, inhibition is obvious, show the utility model proposes passive/validity of active filter.

Claims (7)

1. AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, comprise AC power (1), rectifier (2), inverter (3), long cable (4) and motor (5), the alternating current output of AC power (1) is connected with the ac input end of rectifier (2), the DC output end of rectifier (2) is connected with the direct-flow input end of inverter (3), the ac converter output of inverter (3) by long cable (4) for motor (5) provides working power; After dc-link capacitance C1, C2 series connection, be connected in parallel on DC bus that rectifier (2) exports, the tie point of dc-link capacitance C1, C2 is the clamper mid point of this DC bus;
It is characterized in that, also include source filter (6) and passive filter (7); The input of active filter (6) connects the inversion ac output end of inverter (3), and the output of active filter (6) is connected with motor (5) by long cable (4); The input of passive filter (7) connects the ac input end of rectifier (2), and the output of passive filter (7) connects the alternating current output of AC power (1);
The clamper instruction output end of active filter (6) is connected with the clamper mid point of DC bus, and the interference instruction output end that disappears of passive filter (7) is connected with the neutral point of motor (5).
2. according to claim 1 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, active filter (6) comprises three-phase four winding transformer T, impedance Z 1, impedance Z 2, impedance Z 3, impedance Z 4, transistor VT 1, transistor VT 2, direct voltage source U1 and direct voltage source U2;
The former limit of three-phase four winding transformer T has vice-side winding L 1, vice-side winding L 2, vice-side winding L 3with former limit winding L 4; Vice-side winding L 1, vice-side winding L 2with vice-side winding L 3same Name of Ends U, V, W connect inverter (3) inversion ac output end; Vice-side winding L 1, vice-side winding L 2with vice-side winding L 3different name end U 1, V 2, W 3be connected with motor (5) by long cable (4); The no-load voltage ratio of three-phase four winding transformer T is n;
Complementary transistor VT 1with transistor VT 2inverse parallel connects, composition push-pull type emitter follower;
Transistor VT 1base stage and transistor VT 2the common node of base stage connects impedance Z simultaneously 1one end, impedance Z 2one end, impedance Z 3one end and impedance Z 4one end, impedance Z 1the other end connect secondary winding L 1same Name of Ends U, impedance Z 2the other end connect secondary winding L 2same Name of Ends V, impedance Z 3the other end connect secondary winding L 3same Name of Ends W, impedance Z 4the other end connect ground PE;
Transistor VT 1emitter and transistor VT 2the common node of emitter connects former limit winding L 4same Name of Ends, former limit winding L 4different name end O ' connect the negative pole of direct voltage source U1 and the negative pole of direct voltage source U2 simultaneously; The positive pole of direct voltage source U1 connects transistor VT 1collector electrode, the positive pole of direct voltage source U2 connects transistor VT 2collector electrode.
3. according to claim 2 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, impedance Z 1, impedance Z 2and impedance Z 3resistance is equal.
4. according to claim 2 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, direct voltage source U1 and the equal value of direct voltage source U2 wherein U dfor DC bus-bar voltage.
5. according to claim 2 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, passive filter (7) comprises inductance L 5, inductance L 6, inductance L 7, electric capacity C3, electric capacity C4, electric capacity C5 and resistance R;
Inductance L 5, inductance L 6, inductance L 7one end A, B, C of these three inductance connect the ac input end of rectifier (2), inductance L 5, inductance L 6, inductance L 7the other end A of these three inductance 1, B 1, C 1connect the alternating current output of AC power (1);
The one end of the common node contact resistance R that one end of electric capacity C3, electric capacity C4, electric capacity C5 links together, the other end M ' of resistance R is connected to the neutral point M of motor (5); The other end of electric capacity C3, electric capacity C4, electric capacity C5 connects the other end A of three inductance respectively 1, B 1, C 1.
6. according to claim 5 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, inductance L 5, inductance L 6and inductance L 7induction reactance equal.
7. according to claim 5 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus, it is characterized in that, the capacitance of electric capacity C3, electric capacity C4 and electric capacity C5 is equal.
CN201520094792.3U 2015-02-10 2015-02-10 AC Driving System common-mode voltage and shaft current passive/active suppressing apparatus Expired - Fee Related CN204349789U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109698658A (en) * 2019-01-21 2019-04-30 北京交通大学 Inhibit the method and apparatus of motor rotor ground connection shaft current in frequency changing driving system
CN110391652A (en) * 2018-04-17 2019-10-29 Abb 瑞士股份有限公司 Method and control system for the zero sequence current compensation that earth current reduces
CN110690843A (en) * 2018-07-06 2020-01-14 富士电机株式会社 Motor driving device
WO2022258782A3 (en) * 2021-06-09 2023-03-16 Capactech Limited Power supply and distribution networks

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110391652A (en) * 2018-04-17 2019-10-29 Abb 瑞士股份有限公司 Method and control system for the zero sequence current compensation that earth current reduces
CN110391652B (en) * 2018-04-17 2024-01-09 Abb 瑞士股份有限公司 Method and control system for zero sequence current compensation for ground current reduction
CN110690843A (en) * 2018-07-06 2020-01-14 富士电机株式会社 Motor driving device
CN110690843B (en) * 2018-07-06 2023-09-05 富士电机株式会社 Motor driving device
CN109698658A (en) * 2019-01-21 2019-04-30 北京交通大学 Inhibit the method and apparatus of motor rotor ground connection shaft current in frequency changing driving system
WO2022258782A3 (en) * 2021-06-09 2023-03-16 Capactech Limited Power supply and distribution networks

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