CN112124078A - Power-off control method and power-off control system of permanent magnet synchronous motor - Google Patents
Power-off control method and power-off control system of permanent magnet synchronous motor Download PDFInfo
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- CN112124078A CN112124078A CN202011065033.6A CN202011065033A CN112124078A CN 112124078 A CN112124078 A CN 112124078A CN 202011065033 A CN202011065033 A CN 202011065033A CN 112124078 A CN112124078 A CN 112124078A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/10—Electrical machine types
- B60L2220/14—Synchronous machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
Abstract
The application discloses a power-off control method and a power-off control system of a permanent magnet synchronous motor, the power-off control method of the permanent magnet synchronous motor increases the carrier frequency of a control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency when the motor vehicle is in a preset state, so as to control the permanent magnet synchronous motor to be powered off quickly, ensure that the permanent magnet synchronous motor has excellent control performance on current in the quick voltage change stage at the initial stage of quick power off, prevent the current loop from losing efficacy and preventing the permanent magnet synchronous motor or a controller from being burnt out due to overcurrent, when the quick power-off time exceeds a preset time value, the quick power-off voltage reaches the vicinity of an inflection point, the slope gradually becomes slow, at the moment, the control signal is reduced from the maximum carrier frequency to a preset carrier frequency, the switching loss is reduced, the system efficiency is improved, and the problem that the power-down process of the permanent magnet synchronous motor is slow is solved.
Description
Technical Field
The application relates to the technical field of vehicle engineering, in particular to a power-off control method and a power-off control system of a permanent magnet synchronous motor.
Background
With the continuous development of new energy technology, the types of electric automobiles are more and more, and the electric motor coach becomes an important choice in more and more cities by the characteristics of zero emission, high torque and the like.
However, in the practical application process, after the electric motor coach is subjected to high voltage, the capacitor of the permanent magnet synchronous motor can slowly release the stored electric energy, so that the voltage is slowly reduced, and if the electric motor coach is required to be restarted, the whole coach cannot be subjected to high voltage, so that the whole coach is abnormally started.
Disclosure of Invention
In order to solve the technical problem, the application provides a power-off control method and a power-off control system of a permanent magnet synchronous motor, so as to solve the problem that the power-off process of the permanent magnet synchronous motor is slow.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a power-down control method of a permanent magnet synchronous motor for controlling a power-down process of a permanent magnet synchronous motor of a motor vehicle, the power-down control method of the permanent magnet synchronous motor comprising:
detecting the state of the motor vehicle, providing a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state so as to control the permanent magnet synchronous motor to be powered off, and starting timing after the carrier frequency of the control signal provided to the permanent magnet synchronous motor is increased to the maximum carrier frequency, wherein the control signal is a PWM (pulse width modulation) signal;
when the timing time exceeds a preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency;
and judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
Optionally, the detecting a state of the motor vehicle, and when the motor vehicle is in a preset state, providing a control signal to the permanent magnet synchronous motor to control the permanent magnet synchronous motor to power down, and starting timing after increasing a carrier frequency of the control signal provided to the permanent magnet synchronous motor to a maximum carrier frequency, where the control signal is a PWM signal includes:
detecting the state of a motor vehicle based on a vehicle controller of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
based on the motor controller, after the motor controller receives the power-down control instruction, a control signal is provided for the permanent magnet synchronous motor to control the permanent magnet synchronous motor to be powered down, and timing is started after the carrier frequency of the control signal provided for the permanent magnet synchronous motor is increased to the maximum carrier frequency, wherein the control signal is a PWM signal.
Optionally, when the timing time exceeds a preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency includes:
and when the timing time exceeds the preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency by a preset step length according to a preset period.
Optionally, the value range of the preset period is 50ms +/-10 ms;
the value range of the preset step length is 2kHz +/-0.5 kHz.
Optionally, the value range of the preset voltage is 10V ± 2V.
A power down control system for a permanent magnet synchronous motor for controlling a power down process of a permanent magnet synchronous motor of a motor vehicle, the power down control system comprising:
the power-off starting module is used for detecting the state of the motor vehicle, providing a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state so as to control the permanent magnet synchronous motor to be powered off, and starting timing after the carrier frequency of the control signal provided to the permanent magnet synchronous motor is increased to be the maximum carrier frequency, wherein the control signal is a PWM (pulse width modulation) signal;
the frequency modulation module is used for reducing the control signal from the maximum carrier frequency to a preset carrier frequency when the timing time exceeds a preset time value;
and the voltage judging module is used for judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage or not, and if so, the power-off control process is exited.
Optionally, the power-off initiation module includes:
the state detection unit is used for detecting the state of the motor vehicle based on a vehicle control unit of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
and the signal sending unit is used for providing a control signal to the permanent magnet synchronous motor to control the permanent magnet synchronous motor to be powered off and starting timing after increasing the carrier frequency of the control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency based on the motor controller, wherein the control signal is a PWM (pulse width modulation) signal.
Optionally, the frequency modulation module is specifically configured to reduce the control signal from the maximum carrier frequency to a preset carrier frequency in a preset step length according to a preset period when the timing time exceeds the preset time value.
Optionally, the value range of the preset period is 50ms +/-10 ms;
the value range of the preset step length is 2kHz +/-0.5 kHz.
Optionally, the value range of the preset voltage is 10V ± 2V.
It can be seen from the above technical solutions that the present application provides a power-down control method and a power-down control system for a permanent magnet synchronous motor, wherein the power-down control method for the permanent magnet synchronous motor increases a carrier frequency of a control signal provided to the permanent magnet synchronous motor to a maximum carrier frequency when the motor vehicle is in a preset state, so as to control the permanent magnet synchronous motor to power down quickly, ensure that the permanent magnet synchronous motor has excellent control performance on current at a quick power-down initial voltage change stage, prevent a current loop from failing, and prevent the permanent magnet synchronous motor or a controller from being burnt down due to overcurrent, when the quick power-down time exceeds a preset time value, the quick power-down voltage reaches a position near an inflection point, a slope gradually decreases, and at this time, the control signal is reduced from the maximum carrier frequency to the preset carrier frequency, so as to reduce switching loss, the efficiency of the system is improved, and the problem that the power-down process of the permanent magnet synchronous motor is slow is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of a power-off control method of a permanent magnet synchronous motor according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a power-off control method of a permanent magnet synchronous motor according to another embodiment of the present application;
fig. 3 is a schematic flowchart of a power-off control method for a permanent magnet synchronous motor according to another embodiment of the present application;
fig. 4 is a schematic flowchart of a power-down control method of a permanent magnet synchronous motor according to still another embodiment of the present application;
fig. 5 is a schematic structural diagram of a power-off control system of a permanent magnet synchronous motor according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a power-off control system of a permanent magnet synchronous motor according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a power-off control method of a permanent magnet synchronous motor, which is used for controlling the power-off process of the permanent magnet synchronous motor of a motor vehicle, and as shown in fig. 1, the power-off control method of the permanent magnet synchronous motor comprises the following steps:
s101: detecting the state of the motor vehicle, providing a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state so as to control the permanent magnet synchronous motor to be powered off, and starting timing after the carrier frequency of the control signal provided to the permanent magnet synchronous motor is increased to the maximum carrier frequency, wherein the control signal is a PWM (pulse width modulation) signal;
s102: when the timing time exceeds a preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency;
s103: and judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
The preset state may include a rapid power-off state, and the detection of the state of the motor Vehicle may be performed by a Vehicle Control Unit (VCU) of the motor Vehicle. The process of providing a Control signal to the permanent magnet synchronous Motor to Control the power-off of the permanent magnet synchronous Motor can be finished by a Motor Control Unit (MCU) of the Motor vehicle.
When the motor vehicle is in a preset state, the power-off control method of the permanent magnet synchronous motor increases the carrier frequency of a control signal provided for the permanent magnet synchronous motor to be the maximum carrier frequency so as to control the permanent magnet synchronous motor to be powered off quickly, ensures that the permanent magnet synchronous motor has excellent control performance on current in a quick voltage change stage at the initial stage of quick power-off, prevents a current loop from being out of work and avoids the situation of burning the permanent magnet synchronous motor or a controller due to overcurrent, when the quick power-off time exceeds a preset time value, the quick power-off voltage reaches the vicinity of an inflection point, the slope gradually becomes slow, and at the moment, the control signal is reduced from the maximum carrier frequency to be the preset carrier frequency so as to reduce switching loss, improve system efficiency and solve the problem of slow power-off process of the permanent magnet synchronous motor.
The following describes a specific implementation manner of each step of the power-off control method of the permanent magnet synchronous motor provided in the embodiment of the present application.
Optionally, on the basis of the foregoing embodiment, in an embodiment of the present application, as shown in fig. 2, the power-down control method for the permanent magnet synchronous motor includes:
s201: detecting the state of a motor vehicle based on a vehicle controller of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
s202: based on the motor controller, after the motor controller receives the power-down control instruction, providing a control signal to the permanent magnet synchronous motor to control the permanent magnet synchronous motor to power down, and starting timing after increasing the carrier frequency of the control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency, wherein the control signal is a PWM signal;
s203: when the timing time exceeds a preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency;
s204: and judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
In this embodiment, specific to the state of the motor vehicle and the specific execution subject of the power-off process of the permanent magnet synchronous motor, in a general case, referring to fig. 3, after step S201 and before step S202, the method may further include: s2012: and judging whether the permanent magnet synchronous motor has a fault or not based on the motor controller, performing a subsequent process of providing a control signal when the permanent magnet synchronous motor has no fault, and quitting the whole power-off control process when the permanent magnet synchronous motor has a fault.
Optionally, on the basis of the foregoing embodiment, in another embodiment of the present application, as shown in fig. 4, the power-down control method for the permanent magnet synchronous motor includes:
s401: detecting the state of a motor vehicle based on a vehicle controller of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
s402: judging whether the permanent magnet synchronous motor has a fault or not based on the motor controller, performing a subsequent control signal providing process when the permanent magnet synchronous motor has no fault, and quitting the whole power-down control process when the permanent magnet synchronous motor has a fault
S403: based on the motor controller, after the motor controller receives the power-down control instruction, providing a control signal to the permanent magnet synchronous motor to control the permanent magnet synchronous motor to power down, and starting timing after increasing the carrier frequency of the control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency, wherein the control signal is a PWM signal;
s404: when the timing time exceeds the preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency in a preset step length according to a preset period;
s405: and judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
The present embodiment provides a feasible implementation process, specifically, "when the timing time exceeds a preset time value, the control signal is reduced from the maximum carrier frequency to a preset carrier frequency". The value range of the preset period can be 50ms +/-10 ms; the value range of the preset step length is 2kHz +/-0.5 kHz. For example, the preset period may be 40ms, 50ms, 60ms, etc., and the preset step may be 1.5kHz, 2kHz, 2.5kHz, etc. In an embodiment of the present application, step S403 specifically includes: and when the timing time exceeds the preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency according to a preset period of 50ms and a step length of 2 kHz.
Optionally, the maximum carrier frequency may be 8kHz, and the preset carrier frequency may be 1.2 kHz.
Optionally, the value range of the preset voltage is 10V ± 2V. For example, the preset voltage may be 8V, 9V, 10V, 11V, 12V, or the like, and in a specific embodiment of the present application, the preset voltage is 10V, that is, when the bus voltage of the permanent magnet synchronous motor is less than or equal to 10V, the regulation completed by powering down is considered to be satisfied, the powering down control process is exited, and if not, when the timing time exceeds the preset time value, the step of reducing the control signal from the maximum carrier frequency to the preset carrier frequency by a preset step length according to a preset period is returned.
The following describes a power-down control system of a permanent magnet synchronous motor provided in an embodiment of the present application, and the power-down control system of the permanent magnet synchronous motor described below may be referred to in correspondence with the power-down control method of the permanent magnet synchronous motor described above.
Accordingly, an embodiment of the present application provides a power-off control system of a permanent magnet synchronous motor, as shown in fig. 5, for controlling a power-off process of the permanent magnet synchronous motor of a motor vehicle, the power-off control system of the permanent magnet synchronous motor including:
the power-off starting module 100 is configured to detect a state of the motor vehicle, provide a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state, control the permanent magnet synchronous motor to power off, increase a carrier frequency of the control signal provided to the permanent magnet synchronous motor to a maximum carrier frequency, and start timing, where the control signal is a PWM signal;
a frequency modulation module 200, configured to reduce the control signal from the maximum carrier frequency to a preset carrier frequency when a timing time exceeds a preset time value;
and the voltage judging module 300 is used for judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
Optionally, as shown in fig. 6, the power-down initiation module 100 includes:
the state detection unit 101 is used for detecting the state of a motor vehicle based on a vehicle controller of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
and a signal sending unit 102, configured to provide, based on the motor controller, a control signal to the permanent magnet synchronous motor after the motor controller receives the power-down control instruction, so as to control the permanent magnet synchronous motor to power down, and start timing after increasing a carrier frequency of the control signal provided to the permanent magnet synchronous motor to a maximum carrier frequency, where the control signal is a PWM signal.
Optionally, the frequency modulation module 200 is specifically configured to reduce the control signal from the maximum carrier frequency to a preset carrier frequency by a preset step length according to a preset period when the timing time exceeds the preset time value.
Optionally, the value range of the preset period is 50ms +/-10 ms;
the value range of the preset step length is 2kHz +/-0.5 kHz.
Optionally, the value range of the preset voltage is 10V ± 2V.
In summary, the present application provides a power-down control method and a power-down control system for a permanent magnet synchronous motor, wherein when the motor vehicle is in a preset state, the power-down control method increases the carrier frequency of a control signal provided to the permanent magnet synchronous motor to a maximum carrier frequency to control the permanent magnet synchronous motor to power down quickly, so as to ensure that the permanent magnet synchronous motor has excellent control performance on current at a quick voltage change stage of a quick power-down initial stage, prevent a current loop from failing, and cause an overcurrent to burn the permanent magnet synchronous motor or a controller, when the quick power-down time exceeds a preset time value, the quick power-down voltage reaches a position near an inflection point, the slope gradually decreases, and at this time, the control signal is reduced from the maximum carrier frequency to the preset carrier frequency to reduce switching loss and improve system efficiency, the problem of the slow power-down process of the permanent magnet synchronous motor is solved.
Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power-down control method of a permanent magnet synchronous motor, which is used for controlling a power-down process of the permanent magnet synchronous motor of a motor vehicle, and comprises the following steps:
detecting the state of the motor vehicle, providing a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state so as to control the permanent magnet synchronous motor to be powered off, and starting timing after the carrier frequency of the control signal provided to the permanent magnet synchronous motor is increased to the maximum carrier frequency, wherein the control signal is a PWM (pulse width modulation) signal;
when the timing time exceeds a preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency;
and judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage, and if so, exiting the power-off control process.
2. The power-off control method of the permanent magnet synchronous motor according to claim 1, wherein the detecting the state of the motor vehicle and providing the control signal to the permanent magnet synchronous motor to control the power-off of the permanent magnet synchronous motor and start timing after increasing the carrier frequency of the control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency when the motor vehicle is in a preset state, the control signal being a PWM signal comprises:
detecting the state of a motor vehicle based on a vehicle controller of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
based on the motor controller, after the motor controller receives the power-down control instruction, a control signal is provided for the permanent magnet synchronous motor to control the permanent magnet synchronous motor to be powered down, and timing is started after the carrier frequency of the control signal provided for the permanent magnet synchronous motor is increased to the maximum carrier frequency, wherein the control signal is a PWM signal.
3. The method of claim 1, wherein said reducing the control signal from the maximum carrier frequency to a preset carrier frequency when the timed time exceeds a preset time value comprises:
and when the timing time exceeds the preset time value, reducing the control signal from the maximum carrier frequency to a preset carrier frequency by a preset step length according to a preset period.
4. A power-off control method of a permanent magnet synchronous motor according to claim 3, characterized in that the value range of the preset period is 50ms ± 10 ms;
the value range of the preset step length is 2kHz +/-0.5 kHz.
5. The power-off control method of the permanent magnet synchronous motor according to claim 1, wherein the preset voltage is within a range of 10V ± 2V.
6. A power down control system for a permanent magnet synchronous motor for controlling a power down process of a permanent magnet synchronous motor of a motor vehicle, the power down control system comprising:
the power-off starting module is used for detecting the state of the motor vehicle, providing a control signal to the permanent magnet synchronous motor when the motor vehicle is in a preset state so as to control the permanent magnet synchronous motor to be powered off, and starting timing after the carrier frequency of the control signal provided to the permanent magnet synchronous motor is increased to be the maximum carrier frequency, wherein the control signal is a PWM (pulse width modulation) signal;
the frequency modulation module is used for reducing the control signal from the maximum carrier frequency to a preset carrier frequency when the timing time exceeds a preset time value;
and the voltage judging module is used for judging whether the bus voltage of the permanent magnet synchronous motor is less than or equal to a preset voltage or not, and if so, the power-off control process is exited.
7. The system of claim 6, wherein the de-energization start module comprises:
the state detection unit is used for detecting the state of the motor vehicle based on a vehicle control unit of the motor vehicle, and sending a power-off control instruction to a motor controller of the motor vehicle when the motor vehicle is in a preset state;
and the signal sending unit is used for providing a control signal to the permanent magnet synchronous motor to control the permanent magnet synchronous motor to be powered off and starting timing after increasing the carrier frequency of the control signal provided to the permanent magnet synchronous motor to the maximum carrier frequency based on the motor controller, wherein the control signal is a PWM (pulse width modulation) signal.
8. The system according to claim 6, wherein the frequency modulation module is configured to decrease the control signal from the maximum carrier frequency to a preset carrier frequency in preset steps according to a preset period when the timing time exceeds the preset time value.
9. The power-off control system of the permanent magnet synchronous motor according to claim 8, wherein the preset period has a value range of 50ms ± 10 ms;
the value range of the preset step length is 2kHz +/-0.5 kHz.
10. The power-off control system of the permanent magnet synchronous motor according to claim 6, wherein the preset voltage is within a range of 10V +/-2V.
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| CN202011065033.6A CN112124078B (en) | 2020-09-30 | 2020-09-30 | Power-off control method and power-off control system of permanent magnet synchronous motor |
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| CN112124078B CN112124078B (en) | 2022-04-26 |
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| US20130015802A1 (en) * | 2011-07-14 | 2013-01-17 | Toyota Jidosha Kabushiki Kaisha | Method for discharging charges remaining in capacitor in drive apparatus |
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| US20180079315A1 (en) * | 2016-09-19 | 2018-03-22 | Ford Global Technologies, Llc | Active discharge circuit for link capacitor using phase leg switches |
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| CN112124078B (en) | 2022-04-26 |
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