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S ingle phase induction motors (SPIMs) nowadays are widely used in domestic and commercial areas because of cheap cost, simple structure, low noise and small dimensions etc. Split phase, start and run-capacitor single phase induction motors are well known SPIM motor types [1]. Although a lot of advantages have mentioned, a SPIM has some disadvantages. Its efficiency is low and starting performance is not so good to compare the other electrical machines types.The optimal design of an induction motor in terms of electromagnetic torque means starting and breakdown torques are higher value [2]. Many researchers have investigated to improve the starting torque and efficiency of a SPIM. Some of them have focused the influence of rotor slot geometry like rotor slot type, shape, skewing, number of rotor slot, slot opening and core material.Zhou Rui et al [3], have modeled two single phase induction motors with Maxwell 2D software and changed their dimensions in Maxwell 2D to find optimal slot geometry with respect to starting performance and efficiency. In similar studies; S. Sobhani et al [4] have examined dimensions of two SPIMs and mechanical

This study investigates the effect of rotor geometry on performance in switched reluctance motors (SRM) using models analyzed by the 2-D Finite Element Method (FEM). All models have the same stator geometry, winding features, and air gap, but have different rotor geometries. The SRM model operates at nominal speed of 3000 rpm; with 6/4 pole and 150 W output power. Magnetic model analysis was undertaken for the 3 different rotor models. Electrical performance characteristics; speed, phase current, source current, efficiency, electromagnetic torque, and load torque were determined. Magnetic flux density and flux lines in the stator and rotor and the current densities in windings are presented. The optimal rotor model for SRM was determined by considering electrical and magnetic performance data.

E CS is a machine that provides recycling via separation of nonferrous metals by means of the eddy current effect. It separates copper, aluminum, brass, silver and similar valuable metals from wastes. The most important component of ECS that affects separation performance is magnetic drum. Higher rates of rotation and the multipolarity of the magnetic drum results in greater magnitudes of eddy currents in the metal that will be separated according to Faraday principles. In this case, the separation efficiency increases, while making the separation of smaller sized particles possible [1]. In General ECS, the drum is driven by a coupled motor. This motor rotates the drum directly by coupling or with a belt and pulley mechanism. In this case, reaching higher speeds is difficult due to loss in transfer organs and the balance effect. ECS machine and working principle scheme are given in Fig.1. This study proposes the design of an outer rotor BLDC motor to be installed in the drum to increase the ECS performance and to separate metals with small particle sizes. A BLDC motor consists of a stator with