A speed control method and control system for a motor

Abstract

The invention provides a speed control method and a control system of a motor, which adopts an asymmetrical S-shaped speed curve. The speed control method includes: in the acceleration stage of the motor, calculating and determining the acceleration curve equation according to a preset parabolic curve equation, and using the acceleration curve The equation controls the motor to accelerate and run; in the constant speed stage of the motor, the motor is controlled to run at a constant speed according to the speed corresponding to the acceleration termination time of the acceleration stage; The S-shaped speed curve controls the motor to decelerate. The present invention designs an acceleration curve of a quadratic parabola with an opening downward, so that the motor torque meets the load torque requirement during the acceleration phase, and the stroke of the motor is greatly improved within the same acceleration time, thereby improving the acceleration efficiency. , through reasonable trajectory planning for the entire movement process, the connection between the various movement stages is smooth and impact-free.

Description

technical field [0001] The invention belongs to the technical field of motion control, and in particular relates to a speed control method of a motor and a speed control system of the motor. Background technique [0002] In mechanical motion control, motors and machines are often unable to start and stop directly and at high speed. Therefore, it is necessary to design a reasonable acceleration and deceleration curve to make the starting process and stopping process fast and smooth. Especially in the process of acceleration and deceleration, it is hoped that under the condition of a given maximum speed, the shorter the acceleration and deceleration time, the better, and the smoother the operation of the controlled motor, the better. The achievability of the control algorithm is also required to be good. At present, common acceleration and deceleration curves include trapezoidal acceleration and deceleration and symmetrical S-shaped acceleration and deceleration curves. Among...

AI Technical Summary

Problems solved by technology

The S-shaped speed curve is commonly used, and the acceleration and deceleration stages are very smooth, which can meet the requirements of smooth shutdown under high-speed operation; but the speed response of the S-shaped curve is not fast enough in the acceleration and deceleration stages, resulting in the relative travel of the motor in the same time Not high, or at the same expected speed, it takes longer to move the same distance, which causes the processing speed and efficiency of the equipment to fail to meet the requirements

[0005] Therefore, in order to solve the problem of insufficient speed response and low acceleration efficiency in the acceleration stage of the common S-shaped curve, it is necessary to develop a speed curve to improve the processing speed and efficiency of the equipment without affecting the stability of high-speed shutdown

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