Rotary speed control system and method of permanent magnet synchronous motor

Abstract

The invention discloses a rotary speed control system and method of a permanent magnet synchronous motor. A current sensor module is connected with the permanent magnet synchronous motor; the currentsensor module, a Clark coordinate conversion module and a Park coordinate conversion module are connected in sequence; the Park coordinate conversion module is connected with a nonlinear disturbance observator and a back-stepping controller separately; the nonlinear disturbance observator is connected with the back-stepping controller; the back-stepping controller, a Park coordinate inverse conversion module, a voltage space vector PWM module and an inverter are connected in sequence; the inverter is connected with the permanent magnet synchronous motor; and a rotary speed / position detection module is connected with the nonlinear disturbance observator, the back-stepping controller, the Park coordinate conversion module and the Park coordinate inverse conversion module separately. By adopting back-stepping control and the nonlinear disturbance observator method to replace the conventional PI controller, and by adopting a rotary speed-current single loop control mode to replace the conventional rotary speed loop and current loop cascading control structure, quick tracking control of rotary speed and current is realized.

Description

technical field [0001] The present invention relates to a permanent magnet synchronous motor (PMSM) speed control system and method, in particular to a PMSM speed control based on backstepping control and nonlinear disturbance observer with strong tracking and robustness and easy adjustment of control parameters System and control method. Background technique [0002] Permanent magnet synchronous motor (permanent magnet synchronous motor, PMSM) has the advantages of high efficiency, high specific power, high reliability, and easy maintenance. It has been widely used in CNC machine tools, robots, electric vehicle drive systems, and wind power generation. High-speed rail, aerospace and other fields also have good application prospects. With the rapid development of modern industry, the performance requirements of the permanent magnet synchronous motor control system continue to increase. However, the permanent magnet synchronous motor is a complex multi-variable, strongly co...

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Problems solved by technology

[0003] In order to solve the problems of complex controller design and difficult parameter adjustment in the prior art, the present invention discloses a permanent magnet synchronous motor speed control system and method. The method is based on backstepping control and nonlinear observer to design permanent magnet synchronous motors. The speed-current single-loop controller of the drive system replaces the traditional speed loop and current loop cascaded control to achieve fast and stable speed tracking. It is a new method to use advanced algorithms to realize motor speed control

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