A position sensorless control method for multi-phase permanent magnet synchronous motor

Abstract

The invention discloses a position sensorless control method of a multi-phase permanent magnet synchronous motor. The stator current state space model is constructed under the estimated dq axis system, and according to the q-axis of the estimated current value and the actual current value in each control cycle The error component is integrated to obtain a preliminary estimated speed, and the d-axis error component between the estimated current value and the actual current value is used to correct the preliminary estimated speed to realize the motor speed estimation. The motor of the present invention can directly start quickly in a vector closed-loop from a static state, does not need multiple algorithm switching in the full speed range, has the advantages of fast start capability, good high-speed operation stability, and strong low-speed operation load capacity.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a position sensorless control method of a multi-phase permanent magnet synchronous motor. Background technique [0002] Compared with traditional three-phase motor systems, multi-phase permanent magnet motors have more prominent advantages in high-power and high-reliability applications: high power can be achieved with smaller capacity devices; multi-phase motor systems can achieve redundant control and improve system performance. Reliability; small electromagnetic torque ripple; reduce DC bus current harmonics. It has received extensive attention in the fields of ship propulsion, urban light rail, locomotive traction, aerospace and other fields. [0003] The high-performance permanent magnet synchronous motor vector control needs to obtain the rotor magnetic pole position information. The method of adding a mechanical encoder to obtain the rotor magnetic pole ...

AI Technical Summary

Problems solved by technology

[0003] The high-performance permanent magnet synchronous motor vector control needs to obtain the rotor magnetic pole position information. The method of adding a mechanical encoder to obtain the rotor magnetic pole position may cause many problems, such as the complex hardware structure, which is difficult to use under harsh conditions. For some The motor with special structure makes it difficult to install the encoder. It is necessary to increase the mechanical connection between the controller and the encoder and the encoder and the motor, which increases the complexity of the system and reduces the reliability of the system.

[0004] In order to solve the above problems, speed estimation methods based on high-frequency injection method and back electromotive force method have been proposed one after another. The commonly used position sensorless control algorithm has a limited scope of application, and a method of fusion of multiple algorithms is used in the full speed range, resulting in unstable operation. , thus affecting the starting performance, running stability and low-speed performance of the motor

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