Permanent magnet synchronous motor model prediction speed control method of no-load torque observer

Abstract

The invention discloses a permanent magnet synchronous motor model prediction speed control method of a no-load torque observer. A mechanical motion equation is processed by using a backward Euler discrete formula, and a candidate voltage vector is associated with a speed prediction value in a control period; load torque items in a speed prediction model and a quadrature-axis current prediction model are eliminated by utilizing the thought of incremental model prediction control, so that a load torque value can be obtained without designing a load torque observer, adjustable parameters do not need to be increased, and the complexity of a control system is reduced; the current can be limited only by adding an error tracking term of the quadrature-axis current in the value function.

Description

technical field [0001] The invention belongs to the technical field of motor control, in particular to a model-predicted speed control method of a permanent magnet synchronous motor with a no-load torque observer. Background technique [0002] Permanent magnetic materials refer to materials that can maintain a constant magnetic field once magnetized. At present, the commonly used permanent magnet materials mainly include ferrite, rare earth cobalt, and RuFeB. The development of permanent magnet materials, especially RuFeB permanent magnet materials with high energy product, high coercive force and low price, makes permanent magnet motors cheaper, smaller in size and superior in performance. Permanent magnet motors mainly include brushless DC motors and permanent magnet synchronous motors (Permanent Magnet Synchronous Motor, PMSM). The brushless DC motor is driven by a square wave current, and the permanent magnet synchronous motor is driven by a sine wave current. [0003...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a permanent magnet synchronous motor model predictive speed control method without a load torque observer, which solves the problem that a load torque observer needs to be constructed in the permanent magnet synchronous motor model predictive direct speed control strategy

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