Motor temperature determination method and device and vehicle

Abstract

The invention provides a motor temperature determination method, which relates to the field of motor control, is applied to a motor controller, and comprises the following steps: determining a motor direct-axis first current value and a motor quadrature-axis first current value based on a current motor torque value and a pre-stored current torque function; determining a motor direct-axis inductance value and a motor quadrature-axis inductance value based on the motor resolver angle value, the motor direct-axis first current value and the motor quadrature-axis first current value; fitting a motor stator temperature curved surface equation and a motor rotor temperature curved surface equation based on the motor direct-axis inductance value and the motor quadrature-axis inductance value; and determining the motor stator temperature and the motor rotor temperature based on the motor stator temperature curved surface equation and the motor rotor temperature curved surface equation, thereby realizing a scheme of determining the motor stator temperature and the motor rotor temperature through the motor controller without adding a motor temperature sensor. The motor fault caused by the damage of the temperature sensor is avoided, and the reliability and stability of the motor are improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method, device and vehicle for determining the temperature of a motor. Background technique [0002] With the development of the field of motor control, a temperature sensor is usually installed on the motor stator to collect the temperature of the motor stator. When it is detected that the temperature of the motor stator is too high, the motor is controlled to stop running to avoid motor damage caused by motor overheating, etc. ACCIDENT. [0003] Usually, a positive temperature coefficient thermistor sensor (Positive Temperature Coefficient, PTC) is embedded in the winding of the motor stator. Under normal circumstances, the PTC sensor is in a low resistance state, which does not affect the normal operation of the motor. When the inside of the motor is overheated due to a fault, the thermal resistance of the PTC sensor jumps, and the associated relay is de-energized and released,...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a motor temperature determination method, device and vehicle to solve the problem of setting a temperature sensor on the motor stator, which cannot collect the temperature of the motor rotor, resulting in low reliability of the temperature detection results, and if the temperature sensor Failure will cause the motor to fail to work normally and reduce the reliability of the motor

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