Desing of BLDC motor for water pump using bonded-ferrite

This paper presents the design comparisons of BLDC motor for the water pump for washer. Before the study, the Nd-Fe-B magnet was applied in the conventional water pump motor. This water pump BLDC motor should have waterproofing property, so the IPM rotor using Nd-Fe-B magnet is encapsulated by synthetic resin plastic. This motor´s manufacturing cost was expensive by the using of Nd-Fe-B magnet and the process of plastic capsulation. We studied about the rotor design change using ferrite ring magnet to reduce material cost in the condition of the same stator core design. In the proposed water pump SPM BLDC motor using ferrite PM, the outer and inner diameter of stator is fixed to the value of the conventional IPM BLDC motor using Nd-Fe-B magnet.