A method and system for controlling the speed of a DC motor

A DC motor and speed control technology, which is applied in the control system, vector control system, motor generator control, etc., can solve the problems of large overshoot and chattering
CN109450318BActive Publication Date: 2021-03-16GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2021-03-16

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Abstract

The invention discloses a direct current motor speed control method, comprising the following steps: building a model of a direct current motor, and obtaining a first state equation of an input voltage and angular velocity of the direct current motor according to the model; building an adaptive sliding mode surface, and according to the first state equation, determining correspondence between a first-order derivative of a sliding mode surface of adaptive sliding mode control and a switching function; and according to the correspondence, determining a controlled quantity of the direct current motor. In the method disclosed by the invention, the adaptive sliding mode control is adopted for controlling speed of the direct current motor, and as the sliding mode surface is variable, in a control process, adaptive slope adjustment is performed, thus a track enters a final sliding mode switching area at the highest speed, and overshoot and chattering are obviously reduced. The invention alsodiscloses a direct current motor speed control system, having the same beneficial effects with the direct current motor speed control method.
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Description

technical field

[0001] The present application relates to the technical field of automatic control, in particular to a method and system for controlling the speed of a DC motor. Background technique

[0002] DC motors are widely used due to their high power density, low inertia, and fast response. One of the common ways.

[0003] At present, most DC motors based on sliding mode control adopt the traditional sliding mode control method. The sliding mode surface function of the traditional sliding mode control is:

[0004]

[0005] Among them, s is the sliding surface, is the derivative of s, sgn() is a sign function, and k is a coefficient greater than 0; although the traditional sliding mode control method can achieve the purpose of controlling each controlled variable, because its sliding mode surface is fixed, it has overshoot Big, chattering big problem.

[0006] Therefore, how to provide a solution that can solve the above technical problems is a problem that tho...

Claims

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