Speed sensorless control method of permanent magnet synchronous motor

Abstract

The invention discloses a speed sensorless control method of a permanent magnet synchronous motor, and belongs to the field of permanent magnet motors. A conventional assumption rotating coordinate method is adopted as a basis, on the basis of a model motor method, an estimation rotating speed is directly adopted as a control quantity through a sliding mode control method, then, a self-adaption law of the estimation rotating speed is obtained through a Lyapunov non-linear design method, an algorithm is greatly simplified, the system response speed is increased, meanwhile, forward and reverse rotation of the motor can be achieved, and the method can be used for the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a permanent magnet synchronous motor. Background technique [0002] In the high-performance permanent magnet synchronous motor servo system, it is usually necessary to install a speed sensor to feed back the speed signal, so as to realize closed-loop control. However, as the requirements for control accuracy become higher and higher, problems such as increased cost, difficult installation, larger system size, and inability to adapt to harsh environments brought about by the use of speed sensors have greatly restricted the application of permanent magnet synchronous motors. [0003] So far, researchers around the world have proposed many speed sensorless control methods, most of which are based on the mathematical model of the motor to design the identification algorithm. The algorithm is complex, the calculation is large, and the forward and reverse control of the motor cannot be reali...

AI Technical Summary

Problems solved by technology

However, as the requirements for control accuracy are getting higher and higher, the problems caused by the use of speed sensors, such as increased cost, difficult installation, larger system size, and inability to adapt to harsh environments, have greatly restricted the application of permanent magnet synchronous motors.

[0003] So far, researchers around the world have proposed many speed sensorless control methods, most of which are based on the mathematical model of the motor to design the identification algorithm. The algorithm is complex, the calculation is large, and the forward and reverse control of the motor cannot be realized. The influence of the dead time of the power electronic inverter on the estimation algorithm is not considered

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