A NOVEL PERMANENT-MAGNET MOTOR WITH DOUBLY SALIENT STRUCTURE

A new type of doubly salient machine is presented in which the field e xcitation is provided by nonrotating Permanent Magnets. This doubly sa lient permanent magnet (DSPM) motor is shown to be kindred to square w aveform permanent magnet brushless de motors, Linear and nonlinear ana lyses are made to investigate the characteristics of this new type of PM motor, A prototype DSPM motor is designed and comparisons made betw een this new type of motor and the induction motor, It is shown that b y fully exploiting modern high energy PM material and the doubly salie nt structure, the DSPM motor can offer superior performance over exist ing motors in terms of efficiency, torque density, torque-to-current r atio, torque-to-inertia ratio etc., while retaining a simple structure amenable to automated manufacture.