Research Of High-performance Permanent Magnet Brushless DC Motor Speed Control System

Brushless DC motor keep a good characteristic of DC motors. It use electroniccommutation, and its structure is simple. Its reliability has been improved. Brushless DCmotor has been widely used in the National defense, industrial, civilian areas. Thereforehigh-performance brushless DC motor speed control system has become a research hotspot.Some inherent factors limited to improve the performance of brushless DC motors, such asnonlinear, object uncertainty parameter perturbations and mechanical resonance, etc., theclassic control strategy is difficult to obtain satisfactory results.In this paper, the purpose is to improve motor’s performance, studied the methods ofspeed brushless DC motor, based on sliding mode variable structure control method, usedfuzzy control, adaptive control, inversion of control, etc. as an adjunct, while retaining theadvantages of sliding mode control method while weakening SMVSC deficiencies. Designa brushless DC motor controller allows to obtain a better dynamic and static performance.The following is the content of this paper.(1) It is not a linear brushless DC motor system, which include nonlinear anduncertain factors, therefore we must first establish a brushless DC motor speed controlsystem of nonlinear mathematical model.(2) Buffeting of the variable structure control is the main disadvantage, when designcontroller, join adaptive control, global sliding mode control, and differential and integral.In the new control algorithms, adaptive can reduce buffeting, while the integral term is tosolve the problem of the existence of sliding mode control static error. The simulationresults show that this method can give a brushless DC motor speed control system bettercontroller. By comparison with a normal and ordinary sliding PID control, the systemperformance improvement is more obvious.(3) For the nonlinear problem of brushless DC motor speed control system, theinversion of control, adaptive control, fuzzy control, sliding mode variable structurecontrol combine to retain the strong robustness Sliding Mode Variable Structure Controland inversion of control can be a good deal advantages of nonlinear systems, avoiding the mere inversion control sliding mode control and drawbacks. The simulation shows that themethod applied to the control of brushless DC motor, allowing performance brushless DCmotor is more obvious.(4) As the brushless DC motor speed control system to object, based on the specialmotor control chip Dspic30F5015microchip company as the master control chip, thedesign of brushless dc motor speed controller, completed the design of hardware circuitand software control program writing.(5) Using the LabView design the PC monitoring interface, and implement thecommunication between PC and single chip microcomputer.PC can real motor speed size,rotating speed and direction and speed of a given value, and so on.