Position sensorless control method of five-phase fault-tolerant permanent magnet motor based on specific load

Abstract

The invention discloses a novel five-phase fault tolerant permanent magnet motor sensorless control method based on specific load. A novel back emf observer based on an active disturbance rejection observer is designed on a basis of a load provided by a motor. The state equation of the motor in a static two-phase coordinate system is used as a new control system, and the back emf of the motor is used as control quantity. The active disturbance rejection observer is used to observe a characteristic of alternating current quantity, and the back emf of the motor in the two-phase static coordinate system is observed, and finally, a phase-locked loop observer is used to acquire the rotating speed and the rotor position angle of the motor. By using the novel back emf observer provided by the invention, use of filters is prevented by parameter selection, and the operation bandwidth of the system and the precision of the estimated position angle are improved, and therefore the reliable operation of the five-phase fault tolerant permanent magnet motor sensorless system is realized.

Description

technical field [0001] The invention relates to a position sensorless control method for a five-phase fault-tolerant permanent magnet motor based on a specific load, which is suitable for the field of high-precision servo control of the permanent magnet motor. Background technique [0002] Due to the advantages of simple structure, high efficiency, and high power density, permanent magnet synchronous motors are increasingly used in aerospace, electric vehicles, and wind power applications. The stable operation of the permanent magnet synchronous motor requires a mechanical encoder to detect the rotor pole position. The detected rotor pole position is passed to the corresponding stator winding to generate a rotating magnetic field. The rotating stator magnetic field interacts with the rotor magnetic field to generate a rotating magnetic field. torque to transmit power to the load. Since the use of mechanical encoders leads to problems such as increased cost, reduced reliabil...

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Problems solved by technology

Among them, the sliding mode observer method is widely used. However, because the use of its switching function will cause system chattering problems, the noise in the result will increase, which requires multi-stage filters to eliminate and the cut-off of the filtering link The frequency will vary with the motor speed, increasing the complexity of the observer design

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