Motor zero-position calibration system and method

Abstract

The invention discloses a motor zero-position calibration system. A first DC power source supplies power to a detected motor, an output shaft of the detected motor is in rigid connection with a position sensor, the position sensor outputs an angle signal of the detected motor to a signal processing module, the system is provided with a standard machine used for driving the detected motor to rotate at constant speed, the standard machine is connected with the output shaft of the detected motor, an output shaft of the standard machine is provided with a torque sensor, andthe torque sensor outputs a torque signal to the signal processing module. The motor zero-position calibration system and the motor zero-position calibration method are applied to zero-position calibration of an oil-cooling motor, and especially can be applied to a hybrid power vehicle integrated oil-cooling motor. Different from the traditional zero-position calibration process that a motor rotor is positioned at a position where the minimal force is applied to a motor rotor, resulting in imprecise positioning, the motor zero-position calibration system and the motor zero-position calibration method simulate the actual operating process of motor magnetic field directional control, can avoid the influence of cooling oil on zero-position calibration precision through identifying the position where the minimum force is applied to the motor rotor, and realize the precise and efficient zero-position calibration.

Description

Technical field [0001] The invention relates to the technical field of automobile drive motors, in particular to a zero calibration method of an integrated oil-cooled motor. Background technique [0002] At present, the types of drive motors used in new energy vehicles include AC asynchronous induction motors, permanent magnet synchronous motors, DC motors, DC brushless motors, etc. Among them, permanent magnet synchronous motors have the most specific applications because of their high efficiency and high power density. widely. [0003] Controlling permanent magnet synchronous motors is relatively complicated, and the most commonly used is vector control, that is, field-oriented control. This control method needs to accurately obtain the actual angle of the motor rotor. In practical applications, there is usually a deviation between the rotor position detected by the angular position sensor of the motor and the actual rotor magnetic field position. The zero calibration process o...

AI Technical Summary

Problems solved by technology

For oil-cooled motors, due to factors such as the viscosity of the cooling oil, the positioning angle of the motor rotor is likely to deviate from the theoretical angle, which affects the determination of the relative angle between the rotor position detected by the angular position sensor and the actual rotor magnetic field, which in turn affects to motor performance

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