Direct torque control system of permanent-magnet synchronous motor

Abstract

The invention relates to a direct torque control system of a permanent-magnet synchronous motor. According to the control system, an extended kalman filter (EKF) observer is adopted for stator magnetic linkage and rotation speed estimation, according to a mathematical model of the permanent-magnet synchronous motor, the state variable x of the system equals to [Psi alpha, Psi beta, Omega gamma, Theta gamma] T, the input variable mu equals to [mu alpha, mu beta] T, the output variable y equals to [Iota alpha, Iota beta ] T, and state equations and output equations (11) of the system are obtained. The motor rotating speed is used as the input of an automatic data rate changer (ADRC) speed controller, the measurement value Te of the electromagnetic torque is calculated through the obtained stator magnetic linkage, in addition, the measurement value Te and electromagnetic torque given signals are compared, comparison results are used as the input of a space voltage vector pulse generator, and the output of the space voltage vector pulse generator is connected with a voltage source inverter of the permanent-magnet synchronous motor. The direct torque control system has the advantages of good dynamic performance, better stability performance, high robustness and high anti-interference capability.

Description

Technical field [0001] The invention relates to a permanent magnet synchronous motor control system. Background technique [0002] The development of permanent magnet synchronous motors benefits from the development of power electronics technology and modern control theory. Permanent magnet synchronous motors use permanent magnets to generate air-gap flux without external excitation, and have extremely high power density and torque / inertia ratio. And it has the advantages of small size, light weight, high energy conversion efficiency, high operating reliability, wide speed range, etc. It occupies an increasingly important position in small and medium-sized motion control systems and high-performance control occasions, becoming aerospace, steel rolling, CNC Important research objects in the fields of servo systems, electric vehicles, elevators, ships and submarines. The PID controller is used as the speed regulator in the previous control system, and the voltage integrator is use...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of poor dynamic performance, poor steady-state performance, poor robustness and anti-interference ability of the existing permanent magnet synchronous motor control system, the present invention provides a motor with good dynamic performance and good steady-state performance. Direct torque control system for permanent magnet synchronous motor with strong robustness and anti-interference ability

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