Determination of the Effect of the Slot-Pole Number Change of the Radial-Flux Permanent Magnet Brushless DC Motor on the Magnetic Flux Density

Abstract

Permanent magnet brushless direct current machines (PMBLDCM) have been used in many applications in recent years. Thanks to its different structural features, its usage area increases from domestic applications to electric vehicles. In the design process of the motor, although designs with inner or outer rotors are generally used, different alternative designs such as surface magnets, inner surface magnets or embedded magnets are also realized. In this study, design modeling of a 1.5 kW PMBLDC motor was performed and how different stator slot numbers and different pole numbers affect the magnetic flux density changes at different points of the motor were investigated. Magnetic analysis results were obtained from RMxprt program. Magnetic flux density changes of in the stator tooth and yoke parts, in the air gap part, rotor yoke part and in the poles were analyzed. The most appropriate slot-pole number values were determined.

Keywords

• magnetic analysis
• slot-pole number combination
• pmbdcm