CN111953264A - Synchronous motor control circuit - Google Patents
Synchronous motor control circuit Download PDFInfo
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- CN111953264A CN111953264A CN202010809311.8A CN202010809311A CN111953264A CN 111953264 A CN111953264 A CN 111953264A CN 202010809311 A CN202010809311 A CN 202010809311A CN 111953264 A CN111953264 A CN 111953264A
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- relay
- circuit
- star
- sealing
- detection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
Abstract
The invention relates to the technical field of circuit design, in particular to a synchronous motor control circuit, which comprises a star sealing circuit and a star sealing control circuit; the star sealing circuit comprises a first relay and a second relay, the first relay and the second relay are respectively in short circuit with the output circuit of a three-phase winding of the motor according to a star shape, the star sealing control circuit comprises two control signal output ends and a signal input end, the two control signal output ends are respectively connected with the control ends of the first relay and the second relay, the signal input end is used for receiving a control signal to control the first relay and the second relay to act, and therefore the star sealing circuit is controlled to be switched between a star sealing state and a star releasing state. Therefore, when the elevator stops or the permanent magnet synchronous motor of the elevator is powered off, the star sealing circuit is controlled to be in a star sealing state, safety accidents caused by the fact that the elevator slides are prevented, and when the elevator starts to operate, the star sealing circuit is controlled to be switched to a star sealing releasing state, so that the elevator works normally, and the operation safety of the elevator is improved.
Description
Technical Field
The invention relates to the technical field of circuit design, in particular to a synchronous motor control circuit.
Background
In recent years, with the development of power electronic technology and the gradual maturity of permanent magnet synchronous motor technology, a permanent magnet synchronous traction machine formed by using a permanent magnet synchronous motor is more and more widely applied to the elevator industry because of the advantages of low speed, large torque and the like.
When the permanent magnet synchronous tractor rotates under the action of a non-power supply, mechanical energy is converted into electric energy, the electric energy is equivalent to a generator, in order to prevent the elevator from sliding or galloping when the synchronous tractor loses power (or a motor fails in a brake), the industry needs to control the motor to work and consume the electric energy generated by sliding when the synchronous tractor loses power, induced current is caused in an armature winding loop, and a braking electromagnetic torque in the opposite direction is generated under the action of a permanent magnet magnetic field of the motor, so that the mechanical torque and the electromagnetic torque of the tractor are balanced, and the elevator is prevented from sliding in a free falling mode to cause danger.
Disclosure of Invention
The invention provides a synchronous motor control circuit, which aims to improve the running safety of an elevator.
A synchronous motor control circuit comprises a star sealing circuit and a star sealing control circuit;
the star sealing circuit comprises a first relay and a second relay, and the first relay and the second relay are respectively in short circuit with an output circuit of a three-phase winding of the motor according to a star shape, so that an independent closed loop is formed between the motor and the three-phase winding;
the star sealing control circuit comprises two control signal output ends and a signal input end, the two control signal output ends are respectively connected with the control ends of the first relay and the second relay, and the signal input end is used for receiving control signals to control the first relay and the second relay to act, so that the star sealing circuit is controlled to be switched between a star sealing state and a star sealing releasing state.
Further, the device also comprises a satellite sealing detection circuit;
the star sealing detection circuit comprises two detection access ends and a detection signal output end, the two detection access ends are respectively connected with the first relay and the second relay, when the star sealing circuit is in a star sealing state, the star sealing detection circuit is disconnected, and the detection signal output end of the star sealing detection circuit outputs a first detection signal; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay and the second relay, and the detection signal output end of the star sealing detection circuit outputs a second detection signal.
In one embodiment, further comprising an elevator controller for issuing the control signal;
the first relay and the second relay are both single-pole double-throw relays;
the U phase and the V phase in the output line of the three-phase winding of the motor are respectively connected with the normally closed contact of the first relay, and the V phase and the W phase in the output line of the three-phase winding of the motor are respectively connected with the normally closed contact of the second relay;
one detection access end of the star sealing detection circuit is connected with the normally open contact of the first relay, and the other detection access end of the star sealing detection circuit is connected with the normally open contact of the second relay.
In one embodiment, the signal input ends of the satellite closing control circuit comprise a signal input A end and a signal input B end;
the signal input end A and the signal input end B form one signal input end of the satellite sealing control circuit and are connected with the control end of the first relay, and meanwhile the signal input end A and the signal input end B also form the other signal input end of the satellite sealing control circuit and are connected with the control end of the second relay.
In one embodiment, the star-closing control circuit further comprises a first diode and a second diode, anodes of the first diode and the second diode are both connected with the signal input end a, and cathodes of the first diode and the second diode are both connected with the signal input end B.
In one embodiment, the satellite control circuit further includes a third diode connected in series to the signal input a terminal, and an anode of the third diode is connected to the anode of the first diode.
In one embodiment, the star-sealing detection circuit comprises a photosensitive diode and a light detection circuit corresponding to the photosensitive diode;
when the star sealing circuit is in a star sealing state, the photosensitive diode is disconnected; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay, the photosensitive diode and the second relay;
the light detection circuit is used for detecting whether the photosensitive diode is conducted or not, the output end of the light detection circuit is the detection signal output end and outputs the first detection signal and the second detection signal respectively, and the first detection signal and the second detection signal are used for indicating the conduction and the disconnection states of the photosensitive diode.
In one embodiment, the light detection circuit includes a photosensitive transistor and a first capacitor, two ends of the photosensitive transistor are respectively connected to two ends of the first capacitor, and two ends of the first capacitor are the detection signal output end and are used for outputting the resistance at two ends of the first capacitor.
In one embodiment, the seal star detection circuit further comprises a power supply, a second capacitor and a fourth diode;
the negative electrode of the power supply is a detection access end of the satellite sealing detection circuit and is connected with the normally open contact of the first relay, the positive electrode of the power supply is connected with the positive electrode of the photosensitive diode, the negative electrode of the photosensitive diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is the other detection access end of the satellite sealing detection circuit and is connected with the normally open contact of the second relay; and the second capacitor is respectively connected with the anode and the cathode of the power supply.
In one embodiment, the seal star detection circuit further comprises a third capacitor, a fourth capacitor, a first resistor and a second resistor;
the third capacitor is connected with the second capacitor in parallel; one end of the first resistor is connected with the anode of the power supply, and the other end of the first resistor is connected with the anode of the photosensitive diode; one end of the second resistor is connected with the anode of the photosensitive diode, and the other end of the second resistor is connected with the cathode of the photosensitive diode; one end of the fourth capacitor is also connected with the anode of the photosensitive diode, and the other end of the fourth capacitor is also connected with the cathode of the photosensitive diode.
The synchronous motor control circuit according to the embodiment comprises a star sealing circuit and a star sealing control circuit; the star sealing circuit comprises a first relay and a second relay, and the first relay and the second relay are respectively in short circuit with an output circuit of a three-phase winding of the motor according to a star shape, so that an independent closed loop is formed between the motor and the three-phase winding; the star sealing control circuit comprises two control signal output ends and a signal input end, the two control signal output ends are respectively connected with the control ends of the first relay and the second relay, and the signal input end is used for receiving control signals to control the first relay and the second relay to act, so that the star sealing circuit is controlled to be switched between a star sealing state and a star sealing releasing state. Therefore, when the elevator stops or the permanent magnet synchronous motor of the elevator is powered off, the star sealing circuit is controlled to be in a star sealing state, safety accidents caused by the fact that the elevator slides are prevented, and when the elevator starts to operate, the star sealing circuit is controlled to be switched to a star sealing releasing state, so that the elevator works normally, and the operation safety of the elevator is improved.
Drawings
Fig. 1 is a block diagram of a synchronous motor control circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a satellite sealing control circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a satellite sealing circuit and a satellite sealing detection circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning.
When the permanent magnet synchronous tractor rotates under the action of a non-power supply, mechanical energy is converted into electric energy, which is equivalent to a generator, when the tractor is powered off, a three-phase winding leading-out wire between a frequency converter and a motor is in short circuit by using a lead or a series resistor according to a star shape, so that an independent closed electric loop is formed between the motor and the three-phase winding to consume the electric energy, induction current is induced in an armature winding loop, and braking electromagnetic torque is generated under the action of a permanent magnet magnetic field of the motor to balance the mechanical torque and the electromagnetic torque of the tractor, thereby preventing the elevator from sliding or flying due to the power loss of the synchronous tractor (when the motor fails in a brake), wherein the technology is called as 'star sealing' in the industry. In order to provide the safety of elevator operation, the application provides a synchronous motor control circuit, which comprises a star sealing circuit and a star sealing control circuit; the star sealing circuit comprises a first relay and a second relay, and the first relay and the second relay are respectively in short circuit with an output circuit of a three-phase winding of the motor according to a star shape, so that an independent closed loop is formed between the motor and the three-phase winding of the motor; the star sealing control circuit comprises two control signal output ends and a signal input end, the two control signal output ends are respectively connected with the control ends of the first relay and the second relay, and the signal input end is used for receiving control signals to control the first relay and the second relay to act, so that the star sealing circuit is controlled to be switched between a star sealing state and a star sealing releasing state. Therefore, when the elevator stops or the permanent magnet synchronous motor of the elevator is powered off, the star sealing circuit is controlled to be in a star sealing state, safety accidents caused by the fact that the elevator slides are prevented, and when the elevator starts to operate, the star sealing circuit is controlled to be switched to a star sealing releasing state, so that the elevator works normally, and the operation safety of the elevator is improved.
Furthermore, in order to monitor whether the star sealing circuit works normally in real time, the star sealing detection circuit is additionally arranged, the star sealing detection circuit comprises two detection access ends and a group of detection signal output ends, the two detection access ends are respectively connected with the first relay and the second relay, when the star sealing circuit is in a star sealing state, the star sealing detection circuit is disconnected, and the detection signal output end outputs a first detection signal; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay and the second relay, and the detection signal output end of the star sealing detection circuit outputs a second detection signal. Therefore, whether the star sealing circuit works normally can be detected in real time in the starting and stopping processes of the elevator, if mechanical faults occur, the star sealing circuit faults can be caused or the star sealing circuit is not in a state of releasing the star sealing state to cause the output short circuit of the elevator control cabinet, the star sealing detection circuit can immediately detect fault signals and send the fault signals to a controller in the elevator control cabinet to control the elevator to be stopped for maintenance in time, and the operation safety of the elevator is further ensured.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a synchronous motor control circuit, which includes a star sealing circuit 2 and a star sealing control circuit 3. The star circuit 2 comprises a first relay RLY1 and a second relay RLY2, wherein the first relay RLY1 and the second relay RLY2 are respectively in star short connection with an output line U, V, W of a three-phase winding of a permanent magnet synchronous motor 1 (hereinafter referred to as a motor) of the elevator, so that an independent closed loop is formed between the permanent magnet synchronous motor 1 and the three-phase winding U, V, W. The star control circuit 3 includes two control signal outputs and a signal input, as shown in fig. 2, in this embodiment, the terminals a1 and a2 constitute one control signal output, the terminals B1 and B2 constitute the other control signal output, and a and B constitute the signal input. A1 and A2 are respectively connected with the control ends A3 and A4 of the first relay, and B1 and B2 are respectively connected with the control ends B3 and B4 of the second relay. The signal input terminals a and B are used for receiving control signals to control the first relay RLY1 and the second relay RLY2 to act, so as to control the star sealing circuit 2 to switch between the star sealing state and the star unsealing state.
In one embodiment, the control circuit further comprises an elevator controller, and the elevator controller is used for controlling the operation of the whole elevator, namely the elevator controller is used for sending out control signals and controlling the actions of the first relay RLY1 and the second relay RLY 2.
As shown in fig. 3, the first relay RLY1 and the second relay RLY2 of this embodiment are single-pole double-throw relays, when the star circuit 2 is in a star-sealed state, the normally closed contacts 1 and 4 of the first relay RLY1 are respectively in short circuit with U, V in the output line of the three-phase winding of the permanent magnet synchronous motor 1, and the normally closed contacts 1 and 4 of the second relay RLY2 are respectively in short circuit with V, W in the output line of the three-phase winding of the permanent magnet synchronous motor 1, so that a closed loop is formed between the motor 1 and the three-phase winding to consume the electric energy generated during the sliding of the elevator, induced current is generated in the armature winding loop, and at the same time, braking electromagnetic torque is generated under the magnetic field of the motor permanent magnet, so that the mechanical torque and the electromagnetic torque of the traction machine are balanced, thereby preventing the phenomenon of the sliding or flying of the elevator caused by the loss of electricity of the motor 1. When the elevator is started, the star-sealing control circuit 3 controls the first relay RLY1 and the second relay RLY2 to act, so that the normally closed contacts of the relay are disconnected with the output line U, V, W of the three-phase winding of the motor 1, and the elevator works normally.
In order to further improve the safety of elevator operation, the synchronous motor control circuit of the embodiment further comprises a star sealing detection circuit 4, and the star sealing detection circuit 4 detects whether the star sealing circuit 2 breaks down in real time. As shown in fig. 3, the star sealer detection circuit 4 of the present embodiment includes two detection terminals a5 and a6, and a set of detection signal output terminals GND and FX _ FB, the detection terminal a5 is connected to the normally open contact 5 of the first relay RLY1, and the detection terminal a6 is connected to the normally open contact 5 of the second relay RLY 2. When the star sealing circuit 2 is in a star sealing state, the normally open contacts 5 of the first relay RLY1 and the second relay RLY2 are in an open state, the star sealing detection circuit 4 is open at the moment, and a first detection signal is output between the detection signal output ends GND and FX _ FB; when the star sealing circuit 2 is in a star sealing releasing state, the normally open contacts 5 of the first relay RLY1 and the second relay RLY2 are closed, the star sealing detection circuit 4 forms a conducting loop through the first relay RLY1 and the second relay RLY2, and a second detection signal is output between detection signal output ends GND and FX _ FB.
Further, the star-closing control circuit 3 of the present embodiment further includes a first diode D1 and a second diode D2, anodes of the first diode D1 and the second diode D2 are both connected to the signal input a terminal, and cathodes of the first diode D1 and the second diode D2 are both connected to the signal input B terminal. During the operation of the star sealing control circuit 3, the induction coils in the first relay RLY1 and the second relay RLY2 generate induced current, and the first diode D1 and the second diode D2 are used for limiting the direction of the current, so that the induced current is consumed in a set direction in a loop formed by the induction coil and the first diode D1 and the second diode D2. The star-closing control circuit 3 further comprises a third diode D3, the third diode D3 is connected in series with the signal input a terminal, and the anode thereof is connected with the anode of the first diode D1. The first diode D1 is used to limit the direction of the current in the sensing coil, in this embodiment, for example, the a terminal of the signal input is grounded, the B terminal of the signal input is connected to the high level of 24V, and the current in the sensing coil flows from the positive pole to the negative pole of the first diode D1.
The star detector circuit 4 in this embodiment includes a photodiode DS and a light detector circuit 41 corresponding to the photodiode DS. When the star sealing circuit 2 is in a star sealing state, the photosensitive diode DS is disconnected; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay RLY1, the photosensitive diode DS and the second relay RLY 2. The photo detection circuit 41 is configured to detect whether the photodiode DS is turned on, and output terminals GND and FX _ FB of the photo detection circuit 41 are detection signal output terminals, which respectively output a first detection signal and a second detection signal, and the first detection signal and the second detection signal are used to indicate on and off states of the photodiode DS. When the photodiode DS is turned on, the light detection circuit 41 may detect the light signal, may determine that the photodiode DS is turned on, and outputs a first detection signal, and when the photodiode DS is turned off, the light detection circuit 41 may not detect the light signal, i.e., it is determined that the photodiode DS is turned off. If the photosensitive diode DS is detected to be turned off when the elevator is started, the circuit is determined to be in fault, or if the photosensitive diode DS is detected to be turned on when the elevator is stopped, the circuit is determined to be in fault.
Specifically, the light detection circuit 41 includes a photo-sensitive transistor S1 and a first capacitor C1, two ends of the photo-sensitive transistor S1 are respectively connected to two ends of the first capacitor C1, two ends of the first capacitor C1 are the detection signal output ends GND and FX _ FB, when the photodiode DS is turned on, the photo-sensitive transistor S1 is also turned on, and two ends of GND and FX _ FB are in a low-impedance state; when the photodiode DS is turned off, the photo transistor S1 is also turned off, and the two ends of GND and FX _ FB are in high resistance state. The first capacitor C1 is a filter capacitor of the photo-sensitive transistor S1, and plays a role of filtering. The photo transistor S1 and the photo diode DS form an optical coupler.
In another embodiment, the seal star detection circuit 4 includes a power source U1, a second capacitor C2, and a fourth diode D4. The negative electrode of the power supply U1 is a detection access end A5 of the star-sealing detection circuit, the detection access end A5 is connected with a normally-open contact of the first relay RLY1, the positive electrode of the power supply U2 is connected with the positive electrode of the photodiode DS, the negative electrode of the photodiode DS is connected with the positive electrode of the fourth diode D4, the negative electrode of the fourth diode D4 is another detection access end A6 of the star-sealing detection circuit, and the A6 is connected with a normally-open contact of the second relay RLY 2; the second capacitor C2 is connected to the positive and negative poles of the power supply U1, respectively. The positive electrode of the power supply U1 of this embodiment outputs a voltage of +24V, and the negative electrode outputs a low voltage.
Further, in another embodiment, the star detector circuit 4 further includes a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, and a third resistor R3. The third capacitor C3 is connected in parallel with the second capacitor C2; one end of the first resistor R1 is connected with the anode of the power supply U1, and the other end of the first resistor R1 is connected with the anode of the photodiode DS; one end of the second resistor R2 is connected with the anode of the photodiode DS, and the other end is connected with the cathode of the photodiode DS; one end of the fourth capacitor C4 is also connected to the anode of the photodiode DS, the other end is also connected to the cathode of the photodiode DS, and the fourth capacitor C4 is a filter capacitor of the photodiode DS, and plays a role in filtering. The second capacitor C2 and the third capacitor C3 are decoupling capacitors of the power supply U1. When the star sealing detection circuit 4 is disconnected, namely the first relay RLY1 and the second relay RLY2 are disconnected from the star sealing detection circuit 4, the second resistor R2 is used for forming a loop with the photodiode DS, the second resistor R2 is a quick turn-off resistor and discharges electricity for a junction capacitor of the photodiode DS, and the pull-up resistor is required to be connected for the use of the optical coupling secondary side star sealing feedback signal FX _ FB. The first resistor R1 and the third resistor R3 function as current limiting.
When the star sealing circuit 2 is in the state of releasing the star sealing, the positive pole of the power supply U1, the photodiode DS-V phase and the negative pole of the power supply U1 form a loop, so that the photodiode DS is turned on, and the turn-off information of the star sealing circuit 2 is transmitted to the light detection circuit 41. The output of the elevator control cabinet controls the operation of the motor, and because an independent power supply is used, the signal feedback of the star-sealing detection circuit 4 is not influenced by the V-phase output. When the elevator stops, the photodiode DS has no conducting loop, so that no signal is fed back to the light detection circuit 41.
The detection principle of the synchronous motor control circuit of the embodiment is as follows:
1. when the elevator stops, the U/V/W three phases of the motor are in short circuit through a first relay RLY1 and a second relay RLY2, the star-blocking protection effect is achieved on the motor 1, and whether FX _ FB feedback is at a high level or not is judged at the moment. And if the high level is high, the elevator is normal, and if the low level is low, the fault of the star circuit 2 is detected.
2. When the elevator starts to run, the first relay RLY1 and the second relay RLY2 are actuated through the level (the B end is 24V) of the control signal input A end, the U/V/W of the motor 1 is disconnected, whether FX _ FB feedback is low level or not is judged at the moment, the elevator runs normally in low level, the elevator control cabinet does not output to prevent output short circuit when the FX _ FB feedback is high level, and meanwhile, the fault of the star circuit 2 is detected.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A synchronous motor control circuit is characterized by comprising a star sealing circuit and a star sealing control circuit;
the star sealing circuit comprises a first relay and a second relay, and the first relay and the second relay are respectively in short circuit with an output circuit of a three-phase winding of the motor according to a star shape, so that an independent closed loop is formed between the motor and the three-phase winding;
the star sealing control circuit comprises two control signal output ends and a signal input end, the two control signal output ends are respectively connected with the control ends of the first relay and the second relay, and the signal input end is used for receiving control signals to control the first relay and the second relay to act, so that the star sealing circuit is controlled to be switched between a star sealing state and a star sealing releasing state.
2. The synchronous motor control circuit of claim 1, further comprising a star sealer detection circuit;
the star sealing detection circuit comprises two detection access ends and a detection signal output end, the two detection access ends are respectively connected with the first relay and the second relay, when the star sealing circuit is in a star sealing state, the star sealing detection circuit is disconnected, and the detection signal output end of the star sealing detection circuit outputs a first detection signal; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay and the second relay, and the detection signal output end of the star sealing detection circuit outputs a second detection signal.
3. The synchronous motor control circuit of claim 1, further comprising an elevator controller for issuing the control signal;
the first relay and the second relay are both single-pole double-throw relays;
the U phase and the V phase in the output line of the three-phase winding of the motor are respectively connected with the normally closed contact of the first relay, and the V phase and the W phase in the output line of the three-phase winding of the motor are respectively connected with the normally closed contact of the second relay;
one detection access end of the star sealing detection circuit is connected with the normally open contact of the first relay, and the other detection access end of the star sealing detection circuit is connected with the normally open contact of the second relay.
4. The synchronous machine control circuit of claim 1, wherein the signal input terminals of the satellite control circuit comprise a signal input a terminal and a signal input B terminal;
the signal input end A and the signal input end B form one signal input end of the satellite sealing control circuit and are connected with the control end of the first relay, and meanwhile the signal input end A and the signal input end B also form the other signal input end of the satellite sealing control circuit and are connected with the control end of the second relay.
5. The synchronous motor control circuit of claim 4, wherein the seal star control circuit further comprises a first diode and a second diode, the anodes of the first diode and the second diode are both connected to the signal input A terminal, and the cathodes of the first diode and the second diode are both connected to the signal input B terminal.
6. The synchronous motor control circuit of claim 5, wherein the epistar control circuit further comprises a third diode connected in series at the signal input A terminal, the anode of the third diode being connected to the anode of the first diode.
7. The synchronous machine control circuit of claim 2, wherein the star sealer detection circuit comprises a photodiode and a light detection circuit corresponding to the photodiode;
when the star sealing circuit is in a star sealing state, the photosensitive diode is disconnected; when the star sealing circuit is in a star sealing releasing state, the star sealing detection circuit forms a conducting loop through the first relay, the photosensitive diode and the second relay;
the light detection circuit is used for detecting whether the photosensitive diode is conducted or not, the output end of the light detection circuit is the detection signal output end and outputs the first detection signal and the second detection signal respectively, and the first detection signal and the second detection signal are used for indicating the conduction and the disconnection states of the photosensitive diode.
8. The synchronous motor control circuit according to claim 7, wherein the light detection circuit includes a photo transistor and a first capacitor, two ends of the photo transistor are respectively connected to two ends of the first capacitor, and two ends of the first capacitor are the detection signal output end.
9. The synchronous motor control circuit of claim 7, wherein the seal detection circuit further comprises a power supply, a second capacitor, and a fourth diode;
the negative electrode of the power supply is a detection access end of the satellite sealing detection circuit and is connected with the normally open contact of the first relay, the positive electrode of the power supply is connected with the positive electrode of the photosensitive diode, the negative electrode of the photosensitive diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is the other detection access end of the satellite sealing detection circuit and is connected with the normally open contact of the second relay; and the second capacitor is respectively connected with the anode and the cathode of the power supply.
10. The synchronous machine control circuit of claim 9, wherein the seal detection circuit further comprises a third capacitor, a fourth capacitor, a first resistor, and a second resistor;
the third capacitor is connected with the second capacitor in parallel; one end of the first resistor is connected with the anode of the power supply, and the other end of the first resistor is connected with the anode of the photosensitive diode; one end of the second resistor is connected with the anode of the photosensitive diode, and the other end of the second resistor is connected with the cathode of the photosensitive diode; one end of the fourth capacitor is also connected with the anode of the photosensitive diode, and the other end of the fourth capacitor is also connected with the cathode of the photosensitive diode.
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