Control method and system of motor and vehicle

Abstract

The invention discloses a control method and system of a motor and a vehicle. The method comprises a step of detecting the torque of a motor, a step of detecting the rotation speed of a motor rotor, a step of inquiring a relation curve of a preset motor and the motor torque under different temperatures according to the torque of the motor and the rotation speed of the motor rotor so as to obtain the temperature of the motor rotor, and a step of adjusting the torque of the motor according to the temperature of the motor rotor, wherein the relation curve of the motor and the motor torque under different temperatures comprises a corresponding relationship among the motor torque, the rotation speed of the motor rotor and the temperature of the motor rotor. According to the method, the performance index of the motor can be accurately predicted, thus the efficiency of the motor can be played well, and the power of the vehicle can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a motor control method, system and vehicle. Background technique [0002] Compared with asynchronous motors, permanent magnet synchronous motors have the advantages of high power density, high efficiency, and small size, and are more and more widely used in the field of electric vehicles. In order to make better use of the performance of the permanent magnet synchronous motor, it is necessary to adjust its own torque according to the relevant parameters of the permanent magnet synchronous motor (such as the temperature of the motor stator and rotor). [0003] In related technologies, the torque of the motor stator is usually adjusted according to the temperature of the motor stator, while the influence of the temperature of the motor rotor on the torque is ignored. This is because the stator temperature of the permanent magnet synchronous motor can be detected by the embedde...

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Problems solved by technology

This is because the stator temperature of the permanent magnet synchronous motor can be detected by the embedded temperature sensor, and then the torque of the motor can be adjusted. However, the rotor of the permanent magnet synchronous motor is mainly composed of magnetic steel and permanent magnets. Due to the structural characteristics of the rotor itself , it is impossible to embed a temperature sensor inside it to monitor the rotor temperature in real time. Therefore, in related technologies, the influence of the temperature of the motor rotor on the torque is usually ignored, which will cause a large deviation in the calculation of the motor control torque and affect the efficiency of the motor system.

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