Double-closed-loop controller and double-closed-loop control method of permanent magnet synchronous motor

Abstract

The invention provides a double-closed-loop control method of a permanent magnet synchronous motor. The double-closed-loop control method includes the steps: A, detecting three-phase current, actual rotating speed and a rotor position angle of the permanent magnet synchronous motor, and transforming the three-phase current to obtain stator current in a d-q axis coordinate system; B, controlling the actual rotating speed of the motor and expectation rotating speed by a rotating speed loop fractional order controller to obtain q axis reference current, controlling d axis current and d axis reference current by a current loop fractional order controller to obtain d axis voltage, and controlling q axis current and q axis reference current by the current loop fractional order controller to obtain q axis voltage; C, performing a series of transformations for d-q axis voltage and the rotor position angle, then outputting three-phase voltage, and controlling the permanent magnet synchronous motor. The invention further provides a double-closed-loop controller of the permanent magnet synchronous motor. The controller overcomes the shortcomings of poor applicability and weak anti-jamming capability when a current loop is controlled by the aid of an integer order, so that the motor has better dynamic rotating speed performance and anti-load jumping capability, and the efficiency of a motor system is improved.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a double closed-loop control method for permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motors are widely used in industrial production, CNC machine tools, aerospace and new energy pure electric vehicles and other fields. The permanent magnet synchronous motor is a strongly coupled nonlinear system, which is inevitably subject to external interference during actual work, and under complex and changeable working environment conditions, system parameters and loads are prone to change, which will lead to permanent magnet synchronous motor The control performance becomes worse, which directly affects the speed output of the system. Therefore, the control strategy is an important guarantee to achieve satisfactory performance output and improve the robustness of the permanent magnet synchronous motor speed contro...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a double-closed-loop control method for a permanent magnet synchronous motor. The control method overcomes the defects of poor applicability and weak anti-interference ability when the current loop is controlled by an integer order in the prior art, and adopts a double-closed loop of the speed loop and the current loop. The fractional-order control scheme enables the motor to obtain better speed dynamic performance and load jump resistance, and significantly improves the power factor of the motor and improves system efficiency

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