Abstract
This paper develops a brushless DC motor control technique without using any sensors. Back emf of motor is considered as a parameter for commutation. Also this system incorporates cuk converter as a power factor correction converter for PMBLDC motor fed through a diode bridge rectifier from a single phase AC mains. Three phase VSI is used in this system as an electronic commutator for BLDC motor based compressor in an air conditioner. Here the proportionality between Dc link voltage and speed is considered and speed control in this system is attained by maintaining this proportionality. Wide range speed control is possible by controlling the dc link voltage. Proposed system is designed, modelled and simulated in a Matlab environment and evaluatory analysis of system is done.
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