Zero-position calibration system and method for permanent magnet synchronous motor

Abstract

The invention discloses a zero-position calibration system and method for a permanent magnet synchronous motor. The system comprises a high-voltage DC power supply, a motor controller, a relay and a permanent magnet synchronous motor which are connected in sequence, wherein a control board of the motor controller is also designed with a three-phase back electromotive force sampling circuit, a voltage comparison circuit, a rotation value latching mode selection circuit and a relay control circuit respectively; and the motor controller is also connected with an upper computer through a CAN line.According to the scheme, a control board circuit and a control program of the motor controller are added and modified, thereby realizing one-key calibration of the rotational zero position of the motor without additional circuit and dynamometer dragging, and omitting a complicated bench mounting process. The zero-position calibration system and method are easy to operate, and short in calibrationtime. According to the scheme, a rotational zero position is calculated by means of forward and reverse rotation and filter averaging under the same accelerating torque and limited rotational speed,so that the algorithm is more reasonable and more accurate, and the problem of circuit delay does not need to be considered.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a permanent magnet synchronous motor resolver zero calibration system and a calibration method. Background technique [0002] Permanent magnet synchronous motors have been widely used in electric vehicle drive systems, and their speed detection and control are inseparable from the motor rotor position. At present, the motor rotor position detection is usually realized by a resolver and a corresponding decoding circuit. The detection accuracy of the zero position of the motor resolver will directly affect the performance, efficiency and other indicators of the permanent magnet synchronous motor. Existing methods for detecting the zero position of the resolver usually use bench calibration or use a dynamometer to drive a motor to collect back electromotive force. [0003] Currently, to obtain the zero position of the resolver through bench calibration, the motor and the corr...

AI Technical Summary

Problems solved by technology

[0003] Currently, to obtain the zero position of the resolver through bench calibration, the motor and the corresponding motor controller need to be installed on the test bench, and then the tester operates the bench and related control host computer, and the zero position of the resolver needs to be continuously debugged. Acquisition, operation is complicated and time-consuming, and the accuracy needs to be further verified; the method of using the dynamometer to drag the motor to collect the back EMF also needs to install the motor on the side of the dynamometer, and use the dynamometer to drag the motor to a certain speed to collect the back EMF , using the counter electromotive force zero-crossing angle to obtain by comparing the read angle of the resolver. On the one hand, this method relies on the dynamometer to drag, and on the other hand, it needs a special device or circuit to realize it. The entire operation process is also time-consuming.

Images