A New Hybrid Excitation Flux Switching Motor Using Low Cost Ferrites With Flux Regulation Capability

Abstract

In this article, a new single phase flux switching motor (FSM), which using low cost ferrites instead of NdFeB to provide the main flux, called hybrid excitation FSM (HEFSM) is proposed. The HEFSM can be used in light industrial scenarios such as electric tools, household appliances, pumps and fans, etc. The field winding is placed in the vacant slot of stator, without bringing in any redundant mechanical components for hybrid excitation. To improve the flux regulation capability, an auxiliary air gap is set up inside the stator yoke so that the main flux can be adjustable via the field winding and the stator auxiliary air gap. A simplified magnetic circuit is developed to analyze the flux regulation capability of the motor. Several potential stator configurations for HEFSM are compared, studied and optimized. The dimensional parameter optimization design of the proposed motor is carried out utilizing the multi-objective optimization approach and three-dimensional finite-element analysis (FEA). An 8/4 pole HEFSM with the proposed configuration is prototyped. The experimental results are conducted and compared with those of FEA simulations. Additionally, the electromagnetic vibrations and acoustic noises, which are consistently viewed as the biggest drawback of this type of motor, are also measured and estimated.