Zero deviation identification method and system for vehicle permanent magnet synchronous motor

• Main Authors: KONG YONGQIANG, ZHANG YAFEI, LIU CHUANBAO, XING AIJUAN
• Format: Patent
• Language: Chinese; English
• Published: 04.08.2020
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a zero deviation identification method and system for a vehicle permanent magnet synchronous motor. The method comprises the steps of setting multiple groups of different voltage control angles, and at the same time collecting the d-axis current; comparing the maximum value of the d-axis current under each control angle; taking a voltage control angle corresponding to the maximum value of the d-axis current as a reference initial angle of the permanent magnet synchronous motor; taking the reference initial angle as a voltage control angle; correcting the reference initial angle to obtain an initial angle of the permanent magnet synchronous motor; obtaining an identification zero angle by subtracting the initial angle of the permanent magnet synchronous motor from the electrical angle represented by an encoder; comparing the identification zero angle with a set motor zero angle; and outputting a corresponding protection strategy or carrying out zero angle correction. The system comprise