Method and system for correcting initial angle of rotor of permanent magnet synchronous motor

Abstract

The invention discloses a method and a system for correcting an initial angle of a rotor of a permanent magnet synchronous motor. The method comprises the following steps: controlling a motor controller to drive the permanent magnet motor to operate, and outputting the initial angle of the rotor; controlling the motor controller to perform vector control on the permanent magnet motor according to a current value set for a fixed straight axis, and controlling the permanent magnet motor to operate at a set running speed by using a prime motor; acquiring output torque of the permanent magnet motor; judging whether the output torque exceeds the error range of a target torque or not; if so, compensating the initial angle so as to obtain a corrected value of the current initial angle, detecting the torque again and judging; if not, ending the correction. After the method and the system for correcting the initial angle of the rotor of the permanent magnet synchronous motor are adopted, the accurate adjustment and location of the initial angle of the rotor are realized; furthermore, when initial angles of rotors of different motors need to be adjusted and corrected, only the motor needs to be changed, so that the universality of the correction system is realized.

Description

technical field [0001] The invention relates to the technical field of motor testing, in particular to a method and system for correcting the initial angle of a rotor of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have low power consumption, high efficiency, and wide speed range, and are widely used in the field of electric vehicles. The control of permanent magnet synchronous motors for vehicles mostly uses vector control algorithms, and the high-performance vector control of permanent magnet synchronous motors is inseparable. Accurate rotor initial angle, so it is necessary to identify and confirm the initial rotor angle of each factory permanent magnet synchronous motor. If the identification is inaccurate, it may cause the permanent magnet synchronous motor to fail to start normally, out of step, and will greatly reduce the efficiency of the motor, and even affect the mileage of the vehicle. [0003] In the pri...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a permanent magnet synchronous motor rotor initial angle correction method and correction system to solve the problem that the existing rotor initial angle positioning method cannot accurately locate the initial rotor angle, and at the same time solve the problem of poor tooling versatility

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