| The brushless DC motor(BLDCM) control system is a novel speed-variable system. It offers excellent characteristics of operation, control and economy, and shows great developing potentiality. Furthermore, our country has rich rare-earth resources, and manufacture of rare-earth magnet steels has already reach international standards. It has strategic significance that the competitive power of our country's mechanical and electrical products will be enhanced in international markets, if making full benefit of and giving full play to our advantages in this field, and developing rare-earth permanent-magnet motors to form a series of products of BLDCM. In view of above-mentioned reasons, this thesis makes a detailed study on the control technology and methods to BLDCM.On the basis of the summary for the development and application of permanent magnet BLDCM speed-variable system, this thesis introduces a control system, which uses DSP TMS320LF2407A to control the commutation and speed of BLDCM . The fuzzy PI hybrid control scheme is applied, and a novel fuzzy PI intelligent method is proposed to control the speed servo system. The simulation results show that it works well with high dynamic and static performance owing to its advantage in quick response and good robustness. PWM modes used in the BLDCM control system are introduced, and different effect of the armature current with the PWM modes are analyzed. The recently research results for PWM modes of the BLDCM are summarized. At the same time,by discussing the advantages and the disadvantages of the different PWM modes,and the simulation results can prove the conclusion above.
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