Design and evaluation of a new flux-intensifying permanent magnet brushless motor

In this paper, a new type of flux-intensifying permanent magnet brushless (FI-PMBL) motor is proposed, where a new salient rotor and different stator windings are combined to compare the characteristics. This motor is characterized by d-axis inductance larger than q-axis inductance. Design steps for the rotor structure of new motor are laid out and the key design challenges are discussed. Finite-element method (FEM) is used to evaluate performances, such as air gap flux density, EMF under no load, torque and power characteristic under maximum torque per ampere (MPTA) and constant power speed range (CPSR) conditions. The proposed motor shows benefits in torque under flux intensifying condition, reducing cogging torque, extending the range of speed.