Abstract
In this paper, the characteristics of interior permanent magnet synchronous machine (IPMSM) with concentrated windings are evaluated for three different rotor geometries. The reference machine is a fractional horsepower IPMSM with single-layer magnets (1-layered IPMSM). The maximum output power of the machine is 820 W. Based on the electrical properties and machine cost of the reference machine, IPMSM with two different rotor geometries are designed. The first one is an IPMSM with v-shaped magnets and the second one is an IPMSM with double-layer magnets topology (2-layered IPMSM). The machines are compared in two operating points: one in the base speed area and one in the field weakening range. The focus of the machine comparison is the parasitic effects due to the nonsinusoidal rotor field, e.g., back-EMF harmonics, torque harmonics, radial force densities, and iron losses.
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