Brushless direct current motor control method

Abstract

The invention discloses a brushless direct current motor control method, belonging to the technical field of control of a brushless direct current motor. The control method comprises the following steps of: optimizing the parameters of a proportional integral (PI) controller by using generalized predictive control guidance; introducing the parameters into a brushless direct current motor control system to replace a speed ring PI controller and obtain a new generalized predictive PI control method of the speed ring; and converting a controlled quantity obtained through calculation by the generalized predictive PI control method into a space vector pulse width modulation (SVPWM) signal, and inputting the SVPWM signal after amplification into an inversion driving circuit so as to change output voltage of an inverter and further control the rotational speed of an electric motor. By the brushless direct current motor control method, the tracking control on the rotational speed of a brushless direct current electric motor is achieved. The control method has the advantages of no overshot, short adjustment time, low steady-state error, fast response speed, high control quality and form simplicity, and is convenient to implement.

Description

technical field [0001] The invention relates to a brushless direct current motor control method, in particular to a brushless direct current motor control method based on generalized prediction PI, and belongs to the technical field of brushless direct current motor control. Background technique [0002] The most notable features of brushless DC motors are good speed regulation performance, high efficiency, energy saving and compact structure. Relevant test data show that the average energy saving of brushless DC motors is as high as 10%, and the power saving rate of dedicated brushless motors is 15%-20%. The power-to-mass ratio is greatly improved. Therefore, the in-depth research on the control system of the brushless DC motor is of great significance. [0003] In the current engineering practice, the PID control method is generally used to control the motor, but the single PID control is only suitable for linear systems, and the parameters cannot be adjusted online. Th...

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Problems solved by technology

However, its controller form is more complex, not easy to understand and master, unlike the PID controller, which is simple in form, easy to understand and master, which largely limits the promotion of applications

There are existing patents that use the generalized predictive control algorithm to guide and optimize the PID controller, such as "Water Tank Liquid Level Control Method Based on Generalized Predictive Control Optimization", Publication No. CN104076831A, thus combining the excellent control performance of generalized predictive control and the simple structure of PID control, Overcome the shortcomings of the two algorithms, but there are still deficiencies in the transformation of theory into practice and ease of use

However, there is no existing technology to optimize PI with generalized predictive control and apply it to the control of brushless DC motors.

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