Brushless DC motor simulation control method and brushless DC motor simulation system

A brushless DC motor and control method technology, applied in general control systems, control/regulation systems, instruments, etc., can solve the problems of unstable rotational speed, difficult and efficient control, torque ripple of brushless DC motors, etc., and achieve strong inhibition , the effect of improving acceleration performance and improving driving stability

Inactive Publication Date: 2017-06-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, brushless DC motors have always had the problems of torque ripple and unstable speed. Traditional PID control has been more maturely applied to the speed control of motors. However, due to the influence of nonlinear factors such as motor load and different working conditions, traditional control It is difficult for the strategy to maintain the ideal performance of the design in practical applications
[0003] To solve this problem, the conventional PI controller is proposed in the prior art to control the brushless DC motor. However, due to the armature reaction and phase resistance changes of the brushless DC motor during operation, it is time-varying, Multi-variable, strongly coupled nonlinear system, therefore, it is difficult to achieve efficient control with classical PI control

Method used

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  • Brushless DC motor simulation control method and brushless DC motor simulation system
  • Brushless DC motor simulation control method and brushless DC motor simulation system
  • Brushless DC motor simulation control method and brushless DC motor simulation system

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Embodiment 1

[0052]The brushless DC motor is composed of stator three-phase windings, permanent magnet rotor, rotor position detector, etc. The motor in this embodiment is preferably a permanent magnet brushless DC motor with two-phase conduction, three-phase six-state star connection, and for Two-phase conduction three-phase six-state permanent magnet brushless DC motor, in order to facilitate the analysis of its mathematical model and the characteristics of electromagnetic torque, the following assumptions are made to simplify the analysis: 1) Regardless of the armature reaction, its air-gap magnetic field The induced back electromotive force is approximately regarded as a trapezoidal wave at an electrical angle of 120°; 2) Neglecting the influence of cogging and commutation process, the armature conductor is continuously distributed on the inner surface of the stator; 3) Neglecting the saturation of the motor magnetic circuit, eddy current and hysteresis loss are not considered ; 4) Both...

Embodiment 2

[0097] Figure 5 A brushless DC motor simulation system capable of realizing the above control method is shown, which includes:

[0098]BLDCM body module 1 that can simulate the operating characteristics of real motors;

[0099] a speed control module 2, which is used to output the magnitude of the reference current;

[0100] Hall signal generating module 3, which is used to generate analog Hall signals, and realize motor commutation through the analog Hall signals;

[0101] A reference current module 4, which is connected to the speed control module and the Hall signal generating module, for providing a reference current according to the magnitude of the reference current and the analog Hall signal, and outputting the reference current;

[0102] A current hysteresis control module 5, which is linked to the reference current module, is used to receive the reference current and the input actual current, and adjust the actual current to generate and output an inverter control ...

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Abstract

The invention relates to a brushless DC motor simulation control method and a brushless DC motor simulation system. The brushless DC motor simulation control method comprises steps that S1, back electromotive force in a BLDCM body is acquired; S2, a PI controller is used to establish a speed control module; S3, a Hall signal generating module is established; S4, a reference current module and a current hysteresis control module are established; S5, an inversion circuit module is established. On basis of analysis of brushless DC motor mathematic model, by combining with conventional PI control and fuzzy control advantages, fuzzy PI control and current hysteresis control are used for a permanent magnet brushless DC motor double-closed loop control system used for an electric vehicle, and then simulation verification of a control strategy is carried out, and therefore the rotation speed response of the DC brushless motor is fast and overshoot-free, and strong inhibition performance related to load disturbance is provided, good dynamic, static characteristics are provided, and then the acceleration performance and the driving stability of the electric vehicle are improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a simulation control method and simulation system of a brushless DC motor. Background technique [0002] The hub motor for electric vehicles is a brushless DC motor (BLDCM), which uses an electronic commutator to replace mechanical brushes and mechanical commutators. It uses a permanent magnet rotor, has no excitation loss, and has high energy density. And efficiency, suitable for the operating characteristics of electric vehicles, so it has become an ideal drive motor for direct wheel drive electric vehicles. However, brushless DC motors have always had the problems of torque ripple and unstable speed. Traditional PID control has been more maturely applied to the speed control of motors. However, due to the influence of nonlinear factors such as motor load and different working conditions, traditional control It is difficult for strategies to maintain the ideal performance at desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 严运兵陈涛钱能叶刚张振宇邹梓杰
Owner WUHAN UNIV OF SCI & TECH
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