Motor control method, system and vehicle

Abstract

The invention discloses a motor control method, system and vehicle. The method includes: detecting the torque of the motor; detecting the rotational speed of the rotor of the motor; querying the preset relationship curve between the motor and the torque of the motor at different temperatures according to the torque of the motor and the rotational speed of the rotor of the motor to obtain the temperature of the rotor of the motor; The temperature adjusts the torque of the motor, wherein the relationship curve between the motor and the motor torque at different temperatures includes the correspondence between the torque of the motor, the rotational speed of the rotor of the motor and the temperature of the rotor of the motor. The method of the invention can accurately predict the performance index of the motor, thereby better exerting the efficiency of the motor and effectively improving the power performance of the vehicle.

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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