Torque pulsation restraining method of low-speed direct-drive permanent magnet motor servo system

• Main Authors: GAO YU, XUAN FUQIANG, YANG ZHIDA, BU FEIFEI
• Format: Patent
• Language: Chinese; English
• Published: 19.07.2019
• 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 torque pulsation restraining method of a low-speed direct-drive permanent magnet motor servo system, and belongs to the technical fields of power generation, power transformation and power distribution. According to the method, a virtual cogging torque which is distributed along the circumference of the axis section of the motor and is far larger than the actual cogging torque in amplitude is constructed by utilizing a quadrature axis current. The virtual cogging torque and the actual cogging torque are synthesized, so that only a unique and controllable positioning point is formed in one circle of a motor rotor; and the point is moved at a given speed of the motor, and a virtual damping item which is in negative correlation with the rotating speed error and capable of eliminating inherent oscillation of the rotating speed is introduced, so as to form a rotating speed controller to realize closed-loop control. According to the method disclosed by the invention, when the motor is driv