Vehicle permanent magnet synchronous motor torque estimation method based on power flow and medium

Abstract

The invention provides a vehicle permanent magnet synchronous motor torque estimation method based on power flow and a medium. The method comprises a motor shaft end output torque calculation step: calculating to obtain the output power of the motor shaft end according to any one parameter or any combination of multiple parameters of the input power of the direct current bus, the power loss of thedirect current busbar, the controller loss, the motor copper loss, the motor iron loss and the friction loss, and calculating to obtain the output torque value of the motor shaft end through the output power of the motor shaft end. According to the method, the actual torque is estimated, the deviation can be calculated with the torque instruction of the vehicle control unit, and torque compensation is carried out, so that higher torque control precision is achieved.

Description

technical field [0001] The present invention relates to the technical field of permanent magnet synchronous motors, in particular to a method and medium for estimating the torque of permanent magnet synchronous motors for vehicles based on power flow. Background technique [0002] With the wide application of new energy electric vehicles, motors and controllers are the core of power control. The requirements for automotive permanent magnet synchronous motors and their control performance are getting higher and higher at home and abroad. The performance directly affects its performance in the field of electric vehicles. development of. [0003] Electric vehicles require that the deviation between the torque command of the vehicle controller and the actual output torque of the motor shaft end is very low, that is, the torque control accuracy is very high, and the deviation between the actual torque and the torque command of the vehicle controller is estimated, and torque compe...

AI Technical Summary

Problems solved by technology

[0004] The existing permanent magnet synchronous motor torque estimation is roughly divided into two types. The first is based on the online estimation of the motor torque model. This method requires motor parameters, and the estimation of the motor parameters. The accuracy of the motor parameter calculation directly affects the torque estimation accuracy; the second Two kinds of off-line torque and phase current and speed fitting estimation, fitting requires a large amount of calibration data

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