Method for controlling slip mode variable structure of brushless direct current motor based on power exponential reaching law

A technology of brushed DC motor and sliding mode variable structure, which is applied in the direction of AC motor control, single motor speed/torque control, control system, etc., and can solve the problems of jitter response speed and undiscovered problems

Inactive Publication Date: 2018-06-29
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, many theories are limited to the sliding mode variable structure control motor with exponential reaching rate, but there are problems of jitter and response spe...

Method used

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  • Method for controlling slip mode variable structure of brushless direct current motor based on power exponential reaching law
  • Method for controlling slip mode variable structure of brushless direct current motor based on power exponential reaching law
  • Method for controlling slip mode variable structure of brushless direct current motor based on power exponential reaching law

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Embodiment 1

[0116] This embodiment provides a sliding mode variable structure control method for a brushless DC motor based on a power exponent approach rate. This embodiment is a brushless DC motor speed servo system (governing system) based on DSP design, mainly by brushless DC motor, integrated power drive board, DSP TMS320F28335 evaluation board (ie DSP control circuit module), DSP emulator, programming The software is composed of CCS5.5, and its system composition is as follows figure 1 shown.

[0117] The specific device model and features are described as follows:

[0118] (1) Brushless DC motor

[0119] The model of the brushless DC motor is 57BLF01, the specific parameters: number of magnetic poles: 8; number of phases: 3; rated voltage: 24V; rated speed: 3000rpm; holding torque: 0.2N-m; output power: 63W; peak torque: 0.6N-m; Peak current: 9.6A; Line resistance: 0.6Ω; Line inductance: 0.75mH; Torque constant: 0.065N-m / A; Back EMF 6.23V / kprm; Moment of inertia: 120g cm 2 .

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Abstract

The invention provides a method for controlling a slip mode variable structure of a brushless direct current motor based on a power exponential reaching law. The method comprises the following steps of S1, analyzing a mathematics model of the brushless direct current motor; S2, designing a slip mode controller; combining a power reaching law and an exponential reaching law, so as to obtain the improved reaching law-power exponential reaching law, and calculate the slip mode control rate at the current time; S3, setting a current loop and a speed loop for controlling the brushless direct current motor, wherein the current loop adopts the integral and proportional control type, and the speed loop adopts the slip mode variable structure control type using the power reaching law; S4, repeatedly updating the value of slip mode control rate i, so as to control the brushless direct current motor. The method has the advantages that the control quantity on the brushless direct current motor adopts three adjustable parameters, so that the control and adjusting are more flexible; a control strategy with high control quality, simple type and convenient implementing on the brushless direct current motor is provided.

Description

technical field [0001] The invention relates to the technical field of motor speed response optimization strategies, in particular to a sliding mode variable structure control method for brushless DC motors based on power exponent approach rate. Background technique [0002] With the rapid development of power electronics, brushless DC motors use electronic commutation devices to replace traditional brush commutation devices. Brushless DC motor not only has the excellent speed regulation performance of DC motor, but also has the advantages of simple structure and reliable operation of AC motor. As industrial control has higher and higher requirements for system accuracy, response speed, and stability, it is particularly important to seek a reasonable control method. [0003] The control object in the brushless DC motor speed control system is a nonlinear system, and the traditional PID (Proportional-Integral-Derivative, proportional-integral-derivative) control cannot meet ...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P23/00
CPCH02P6/08H02P23/0009
Inventor 郭伟高严凯乔东东李涛
Owner NANJING UNIV OF INFORMATION SCI & TECH
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