Modeling and control of brushless DC motor for compressor driving

With the advantages of small size, light weight and more compact construction, brushless DC motor (BLDCM) has been widely applied to the field of industry. Centrifugal compressor converts the kinetic energy of the air into pressure, and it can be used to provide air to the full cell. The drive and control strategy of BLDCM not only affect the characteristics of centrifugal compressor, but also has an impact on the performance of full cell, especially in the range of high speed. Models of high speed BLDCM and centrifugal compressor with 1 kW rated power and 250,000 rpm rated speed are built in this paper. Drive and control method of three-phase six-state for the BLDCM is introduced in detail, and it is used to drive the centrifugal compressor. The characteristics of speed, torque, voltage and current are present and the relationship between air pressure and air mass flow is researched.

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