Method for adaptively acquiring initial position of motor rotor

Abstract

The invention discloses a method for self-adaptive acquisition of the initial position of the motor rotor, which controls the motor to be in a free-rotating state, through the I qcmd = 0, I dcmd = The current command of the magnetic field weakening current. When the initial position of the motor rotor is aligned, the motor is in a static state. If the initial position is not aligned, the motor will rotate. Adjust the offset angle of the initial rotor position through the motor controller until the motor stops Rotate, and finally make the d-axis direction of the motor rotor coincide with the A-axis of the stator. The invention can quickly detect the initial position of the motor rotor in real time, avoiding the need for each motor to be calibrated on a stand, saving manpower and material resources, improving the accuracy of torque control, avoiding repeated labor, and improving work efficiency. Suitable for mass production of motors and their motor controllers in mass production.

Description

technical field [0001] The invention relates to an adaptive acquisition method for the initial position of a motor rotor, which belongs to the field of permanent magnet motor control. Background technique [0002] Permanent magnet motors are widely used in pure electric vehicles and hybrid electric vehicles. For mass-produced permanent magnet motors, due to current processing technology problems and cost considerations, there is a certain deviation in the initial position of the rotor of each permanent magnet motor. The initial position information of the rotor is the prerequisite for the motor to start and run normally, and it is also a necessary condition for the correct implementation of the control algorithm. If the detection of the initial rotor position is wrong, it will seriously affect the calculation of the rotor position in the future, so that other series of algorithms about motor control cannot be completed correctly, which will cause the motor to run in disorder...

AI Technical Summary

Problems solved by technology

If the detection of the initial rotor position is wrong, it will seriously affect the calculation of the rotor position in the future, so that other series of algorithms about motor control cannot be completed correctly, which will cause the motor to run in disorder and make it unable to enter the normal running state

[0003] At present, the detection of the initial position of the permanent magnet motor rotor usually requires methods such as mechanical structure positioning or manual measurement of the motor’s back EMF to find the initial angle, which requires engineers to recalibrate the initial position of each motor on the bench. Lifting work efficiency is low, not suitable for mass production of motors

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