Brushless direct current motor backstepping method control method and system

Abstract

The invention discloses a brushless direct current motor backstepping method control method and system. The method comprises the following steps: inputting an error eomega of a set mechanical angularspeed given value of the brushless direct current motor and of a mechanical angular speed omegam of the motor output by a rotating speed detection module into a speed backstepping controller for control to obtain a reference q-axis current of the motor, and taking an error between a q-axis assumed current and an actual q-axis current as an input of the current backstepping controller; assuming that an error with the actual d-axis current is used as another input of the current backstepping controller; inputting components of the stator voltage output by the current backstepping controller under the rotating coordinate system into a reverse Park conversion module; and inputting the components into a space vector modulation module, and obtaining three-phase switching control signals Sa, Sb and Sc required by the inverter after a space vector modulation algorithm. According to the invention, complete decoupling of the brushless direct current motor system is realized, the design process of the system is simplified, the adjustment parameters of the system are reduced, and the rotating speed, the current tracking performance and the anti-interference performance are improved.

Description

technical field [0001] The invention belongs to the field of brushless DC motor speed regulation, and in particular relates to a brushless DC motor backstepping control method and system. Background technique [0002] At the beginning of the 20th century, the development of brushed DC motors has become mature, but brushed DC motors have problems such as commutation friction, noise, short life, and high maintenance costs caused by mechanical brushes. Brushless DC motors use electronic commutation instead of brush commutation, which solves the above problems caused by mechanical brushes, and has a higher output torque to motor volume ratio. It is used in electric vehicles, household appliances, industrial automation and aerospace equipment. The field of application is becoming more and more extensive. The brushless DC motor is a nonlinear, strongly coupled, and time-varying system. The integral coefficient of the traditional proportional-integral-derivative (PID) control algo...

AI Technical Summary

Problems solved by technology

[0002] At the beginning of the 20th century, the development of brushed DC motors has become mature, but brushed DC motors have problems such as commutation friction, noise, short life, and high maintenance costs caused by mechanical brushes.

The brushless DC motor is a nonlinear, strongly coupled, and time-varying system. The integral coefficient of the traditional proportional-integral-derivative (PID) control algorithm does not change, resulting in a steady increase or decrease in the integral increment, which inevitably occurs during the control process. Positive or negative integral saturation cannot meet higher precision control requirements. The current nonlinear control method design is more complicated and difficult to implement

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