MTPV compensation method and system for driving permanent magnet synchronous motor

Abstract

The invention relates to an MTPV compensation method and system for driving a permanent magnet synchronous motor. The method includes: drawing the voltage limit ellipse of the dq rotating coordinate system at each speed after the motor enters the field weakening region, and adjusting parameters to make the voltage limit ellipse When approaching the theoretical MTPV curve, carry out the calibration of the reference current command table of the motor; judge whether compensation is required according to the ratio of the total voltage of the motor to the DC bus voltage of the controller; The value of the DC bus voltage compensates the d-axis stator current in the reference current command table. The voltage of the dq axis is the total voltage u of the motor s As a condition for modifying the stator current id value in the reference current command table, the d-axis stator current in the reference current command table is compensated according to the value of the DC bus voltage of the controller, so as to achieve the purpose of compensation and improve the inverter voltage utilization The rate is low and the loss is reduced.

Description

technical field

[0001] The invention relates to the field of motor control, in particular to an MTPV compensation method and system for driving a permanent magnet synchronous motor. Background technique

[0002] The permanent magnet synchronous motor for vehicles is the core component of driving the car. High-performance motor control determines the rapid development of electric vehicles. The permanent magnet synchronous motor speed control system generally consists of DC power supply, inverter, controller and motor. Currently, the drive There are two main motor drives for electric vehicles: vector control and direct torque control.

[0003] Vector control is actually the control of the three-phase stator current. By converting the three-phase stator alternating current into two-phase direct current, the magnitude of the dq axis current is directly controlled to realize the vector control of the permanent magnet synchronous motor. The torque of the motor is controlled by co...

Examples

Embodiment 1

[0046] Embodiment 1 provided by the present invention is an embodiment of the MTPV compensation method for driving a permanent magnet synchronous motor provided by the present invention, and the embodiment of the method includes:

[0047] Step 1. Draw the voltage limit ellipse of the dq rotating coordinate system at each speed after the motor enters the field weakening area, and adjust the parameters to make the voltage limit ellipse close to the theoretical MTPV curve, and then calibrate the reference current command table of the motor.

[0048] The process of drawing a voltage limit ellipse involves:

[0049]After the voltage reaches the limit of the output voltage of the inverter, the speed of the motor is continuously increased by increasing the d-axis stator current. At this time, the voltage limit ellipse at each speed is drawn.

[0050] The output voltage of the inverter is limited by the DC input voltage. When the magnetic synchronous motor is controlled, when the volt...

Embodiment 2

[0075] Embodiment 2 provided by the present invention is an embodiment of a MTPV compensation system for driving a permanent magnet synchronous motor provided by the present invention, such as Figure 5 Shown is the structural block diagram of the embodiment of a kind of drive permanent magnet synchronous motor MTPV compensation system provided by the present invention, by Figure 5 It can be seen that the system includes: the system includes: a reference current command table calibration module 101 , a compensation judgment module 102 and a compensation calculation module 103 .

[0076] The reference current command table calibration module 101 is used to draw the voltage limit ellipse of the dq rotating coordinate system at various speeds after the motor enters the field weakening area, and adjust the parameters to make the voltage limit ellipse close to the theoretical MTPV curve to calibrate the reference current command table of the motor .

[0077] The compensation judg...

technical field

[0001] The invention relates to the field of motor control, in particular to an MTPV compensation method and system for driving a permanent magnet synchronous motor. Background technique

[0002] The permanent magnet synchronous motor for vehicles is the core component of driving the car. High-performance motor control determines the rapid development of electric vehicles. The permanent magnet synchronous motor speed control system generally consists of DC power supply, inverter, controller and motor. Currently, the drive There are two main motor drives for electric vehicles: vector control and direct torque control.

[0003] Vector control is actually the control of the three-phase stator current. By converting the three-phase stator alternating current into two-phase direct current, the magnitude of the dq axis current is directly controlled to realize the vector control of the permanent magnet synchronous motor. The torque of the motor is controlled by co...

Examples

Embodiment 1

[0046] Embodiment 1 provided by the present invention is an embodiment of the MTPV compensation method for driving a permanent magnet synchronous motor provided by the present invention, and the embodiment of the method includes:

[0047] Step 1. Draw the voltage limit ellipse of the dq rotating coordinate system at each speed after the motor enters the field weakening area, and adjust the parameters to make the voltage limit ellipse close to the theoretical MTPV curve, and then calibrate the reference current command table of the motor.

[0048] The process of drawing a voltage limit ellipse involves:

[0049]After the voltage reaches the limit of the output voltage of the inverter, the speed of the motor is continuously increased by increasing the d-axis stator current. At this time, the voltage limit ellipse at each speed is drawn.

[0050] The output voltage of the inverter is limited by the DC input voltage. When the magnetic synchronous motor is controlled, when the volt...

Embodiment 2

[0075] Embodiment 2 provided by the present invention is an embodiment of a MTPV compensation system for driving a permanent magnet synchronous motor provided by the present invention, such as Figure 5 Shown is the structural block diagram of the embodiment of a kind of drive permanent magnet synchronous motor MTPV compensation system provided by the present invention, by Figure 5 It can be seen that the system includes: the system includes: a reference current command table calibration module 101 , a compensation judgment module 102 and a compensation calculation module 103 .

[0076] The reference current command table calibration module 101 is used to draw the voltage limit ellipse of the dq rotating coordinate system at various speeds after the motor enters the field weakening area, and adjust the parameters to make the voltage limit ellipse close to the theoretical MTPV curve to calibrate the reference current command table of the motor .

[0077] The compensation judg...

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