System and method for controlling operation of a permanent magnet motor and vehicle including such a system

Abstract

The present invention relates to a system for controlling the operation of a permanent magnet motor, the system comprising: a temperature sensor installed on the core coil of the permanent magnet motor, and the temperature sensor is used for sensing the current temperature of the core coil and a control module in electrical communication with the temperature sensor and the permanent magnet motor, the control module controls the operation of the permanent magnet motor according to the current temperature of the iron core coil; wherein the control module is set Two control strategies are used to control the operation of the permanent magnet motor before the current temperature of the iron core coil is lower than the first temperature, wherein the first temperature is the temperature when the maximum output power of the motor starts to decrease. The invention also relates to a method for controlling the operation of a permanent magnet motor. According to the present invention, a balance can be achieved between the maximum efficiency and the maximum output power of the electric motor, thereby reducing the possibility of the reduction of the maximum output power during the operation of the electric motor.

Description

Technical field [0001] The present invention relates to permanent magnet motors, and more particularly to systems and methods for controlling permanent magnet motors, and a vehicle including such a system. Background technique [0002] As environmental pollution becomes more and more serious, clean energy vehicles such as electric vehicles or hybrid vehicles are increasingly concerned. The electric vehicle or hybrid vehicle utilizes or at least partially utilizes electrical energy to drive the permanent magnet motor to rotate, which in turn will allow the vehicle to exercise on the road. During the permanent magnet motor operation, due to the loss of the electric mechanical resistance, the loss of the magnetic material caused by the magnetic material in the core is referred to as iron loss during the magnetic material in the core. In order to reduce the loss of the motor, improve the efficiency of the motor, usually use two control strategies to control the operation of the motor...

AI Technical Summary

Problems solved by technology

However, the problem with the maximum efficiency control strategy is that although the total loss of the motor is reduced, the increased direct-axis demagnetization current causes the copper loss of the motor to increase, which will cause the motor to overheat

However, for electric motors used in electric vehicles or hybrid vehicles, such a reduction in maximum output power will inevitably lead to a reduction in vehicle speed or a smaller torque output during driving, which will bring a negative impact on the driver. bad driving experience

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