Model prediction and inversion control method of brushless direct current motor

Abstract

The invention relates to a model prediction and inversion control method of a brushless direct current motor. High-precision and high-stability control over the rotating angle and rotating speed of the motor under the action of torque interference and loads is achieved. In a motor digital control system, under the condition that motor parameters are known, the state evolution rules of the rotationangle and the rotation speed of the motor under controlled rotation are solved according to the mechanical characteristics and electrical characteristics of the motor. In each control period, voltageand current required for controlling the motor to rotate at present are obtained by means of inversion according to a rotation angle and a rotation speed planned by a motor control task and expectedto be reached subsequently by the motor, and the rule of the controlled rotation of the motor through measuring state variables such as the rotation angle, rotation speed and current of the motor. When the motor deviates in the rotation angle and rotation speed due to external moment interference or load action, compensation for the external moment interference and the load action is realized through compensation control. The method has the advantages of high motor control response speed, high control precision, and good control robustness under interference and load.

Description

technical field [0001] The invention relates to a digital control method of a brushless DC motor whose stator is a three-phase symmetrical star-shaped connection winding, in particular to a model prediction and inversion control method of a brushless DC motor, which can be widely used in this type of brushless DC Simple speed control and synchronous control of rotation angle and speed of the motor under various torque loads and disturbances. Background technique [0002] Brushless DC motors are widely used because of their simple structure, efficient and reliable operation, and easy control. The high precision, high stability, agile and fast rotation control of the brushless DC motor is an important guarantee for the realization and achievement of good performance indicators of various electric servo turntables, CNC machine tools, control and service robots. Under various tasks and load conditions, brushless DC motors are required to have control qualities such as timely re...

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Problems solved by technology

[0004] At present, the PID control, fuzzy control, robust control, sliding mode variable structure control, adaptive control and other methods of brushless DC motors have different degrees of control accuracy /Poor stability, weak robustness to disturbance and load, large subjective influence factors in controller design, etc., and usually designed from the perspective of system stability, there are ofte

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