Switched Reluctance Motor (SRM) was used in 1838 in Scotland for the first time as a locomotive motor. Although this motor's basic working principle variable reluctance motor theory had been known before, it was started to be used for variable and adjustable speed applications merely after 1980's. In recent years, through the technological progress of power electronic materials appropriate opportunities have been supplied for the use of this motor. SRM is structurally very base. It has salient poles both at its rotor and stator. Excitation windings are placed only on stator poles. Their being base and lasting, highly efficient are the most important advantage of them. Although a lot studies have been done on them by academicians, their use in the fields of application is not widespread [1-4]. There are many surveys on SRM in literature: Moellem and Ong have realized torque prediction of SRM in their survey using finite elements method. Garrigan and colleagues have observed radial forces in SRMs in their survey. Fenercioglu and Tarimer have searched the factors affecting phase inductance of SRM. Tang and colleagues have made the transience analysis of SRM under constant and variable speed to evaluate the motor's electromagnetic force and noise. Sundaram and colleagues using finite elements method have made comparative magnetic analysis of different polar surface SRMs. Gizlier and colleagues have observed simulation and magnetic features of SRM by using finite elements method [2, 5-9]. In this paper, rotor pole of a 12/8-pole SRM have been modified by helical method without changing its geometry, magnetic analyses have been made separately as flat rotor and modified rotor with Ansoft Maxwell 3D, the results have been evaluated comparatively.
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