Abstract—
In this paper, a permanent magnet brushless DC motor (PMBLDCM) fed through a three-phase voltage source inverter (VSI) is used to drive a compressor load of an air conditioner. The PMBLDCM drive is fed through a diode bridge rectifier (DBR) from single-phase AC mains using a buck forward DC-DC converter as a single-stage power factor correction (PFC) converter. The speed of the compressor is controlled using a concept of the voltage control at DC link proportional to the desired speed of the PMBLDCM. Therefore the VSI performs only as an electronic commutator for the PMBLDCM. The stator current of the PMBLDCM during step change of the reference speed is controlled within the specified limits by an addition of a rate limiter in the reference DC link voltage. The proposed PMBLDCM drive with the voltage control is designed, modeled and its performance is simulated in Matlab-Simulink environment for an air conditioner driven through a PMBLDC motor. The obtained results of the proposed speed control scheme are presented to demonstrate an improved efficiency of the PMBLDCM drive system with PFC feature in wide range of the speed and the input AC voltage.
In this paper, a permanent magnet brushless DC motor (PMBLDCM) fed through a three-phase voltage source inverter (VSI) is used to drive a compressor load of an air conditioner. The PMBLDCM drive is fed through a diode bridge rectifier (DBR) from single-phase AC mains using a buck forward DC-DC converter as a single-stage power factor correction (PFC) converter. The speed of the compressor is controlled using a concept of the voltage control at DC link proportional to the desired speed of the PMBLDCM. Therefore the VSI performs only as an electronic commutator for the PMBLDCM. The stator current of the PMBLDCM during step change of the reference speed is controlled within the specified limits by an addition of a rate limiter in the reference DC link voltage. The proposed PMBLDCM drive with the voltage control is designed, modeled and its performance is simulated in Matlab-Simulink environment for an air conditioner driven through a PMBLDC motor. The obtained results of the proposed speed control scheme are presented to demonstrate an improved efficiency of the PMBLDCM drive system with PFC feature in wide range of the speed and the input AC voltage.
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