Electrical angle calibration method, evaluation method and system of permanent magnet synchronous motor

Abstract

The invention relates to the technical field of electrical angle calibration of alternating-current motors, in particular to an electrical angle calibration method, evaluation method and system of a permanent magnet synchronous motor. According to the method, the real-time electrical angle of the motor is accurately calculated through forward and reverse calibration of the multi-pole electrical angle of the motor, test data can be judged, the problem of inaccurate zero calibration caused by other factors is solved, and after an accurate test result is obtained, the calibration precision of the electrical angle of the motor can be effectively improved; control characteristics during closed-loop control of the motor can be improved.

Description

technical field [0001] The invention relates to the technical field of electrical angle calibration of AC motors, in particular to an electrical angle calibration method, evaluation method and system of a permanent magnet synchronous motor. Background technique [0002] Traditionally, brushed DC motors are widely used. However, brushed motors are not suitable for technical fields with high reliability requirements such as aerospace due to problems such as brush wear and motor commutation that easily generate electric sparks. [0003] The stator of the AC permanent magnet synchronous motor (hereinafter referred to as the permanent magnet synchronous motor) is a coil, the rotor is a permanent magnet, and no longer contains mechanical brushes. It adopts electronic commutation technology and has the characteristics of high power density, low moment of inertia and high reliability. , with the development of microelectronics technology, sensor technology and control theory, perman...

AI Technical Summary

Problems solved by technology

When the permanent magnet motor is in use, an encoder is generally installed on the coaxial motor (it can be an absolute or incremental encoder). The control method is divided into PMSM control method and pulse width excitation control method. Usually, the encoder and the rotor After the coaxial connection, due to the randomness of its installation, the initial relationship between the absolute position signal and the motor shaft is random and unknown. Therefore, after the encoder is installed, the electrical angle must be calibrated first to establish the electrical angle of the motor and the encoder. One-to-one correspondence between the code values, and then achieve the purpose of controlling the motor through the control algorithm, but the conventional calibration method is unstable, and the calibration results of the electrical angle are often inaccurate

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