Initial alignment method of permanent magnetic synchronous motor rotor of pure electric vehicle

Abstract

The invention discloses an initial alignment method of a permanent magnetic synchronous motor rotor of a pure electric vehicle, comprising the following steps: 1, respectively detecting a deviation amount of a permanent magnetic synchronous motor between a zero position of a rotary transformer mounted on a motor axle and a mechanical zero position of the motor at six level states; 2, judging the deviation amount in the first step: if the deviation amount is smaller than the preset error, calculating an average value of the six deviation values as an initial position of the motor rotor; if the deviation amount is larger than the preset error, detecting an outlet sequence of the permanent magnetic synchronous motor and then repeating the above steps. The initial alignment method has the following advantages: 2, the detection method is simple and practical; 2 during the detection process, the motor is detected without being mounted on a testing stand; 3, the detection device is simple, a switch and a contactor set are needed and a frequency converter and a motor controller are not needed to detect; 4, the detection accuracy is high, the maximum initial alignment error by the method does not exceed +- 5 degree electrical angles; 5, the outlet sequence of the motor is detected by a certain logical relationship judgment.

Description

technical field [0001] The invention relates to a positioning method for a rotor of a permanent magnet synchronous motor after assembly, in particular to an initial positioning method for a permanent magnet synchronous motor rotor of a pure electric vehicle. Background technique [0002] At present, when controlling the permanent magnet synchronous motor for pure electric vehicles, the vector direction of the three-phase current synthetic magnetic field of the stator is controlled by the controller. In order to effectively control the stator magnetic field vector, accurate measurement of the rotor position is required. The existing method for determining the initial position of the rotor of a permanent magnet synchronous motor is to determine the initial position of the rotor after energizing a certain phase current of the motor to achieve an accurate positioning of the motor rotor position; the disadvantage is that the control system is relatively complicated and requires c...

AI Technical Summary

Problems solved by technology

The existing method for determining the initial position of the rotor of a permanent magnet synchronous motor is to determine the initial position of the rotor after energizing a certain phase current of the motor to achieve an accurate positioning of the motor rotor position; the disadvantage is that the control system is relatively complicated and requires control software to determine the initial position of the rotor. Cooperate

Another method is to use the salient pole effect of permanent magnet synchronous motors to accurately identify the initial position of the motor rotor by adding high-frequency excitation current to the motor windings, but this method cannot be applied to surface-mounted permanent magnets without salient pole effects Synchronous motors have poor applicability to different types of motors, and the detection device is complicated

Images