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Torque Characteristic of the Synchronous Reluctance Motor for Different Rotor Design

The basic design principle for a SynRM rotor is to create a magnetic structure that provides minimum magnetic reluctance in one direction (direct or d axis) and maximum reluctance in the orthogonal direction (quadrature or q axis). The synchronous reluctance motor has some inherent advantages over induction motor and permanent magnet synchronous motor technologies. Reluctance technology most obvious benefits are rotor synchronization for applications where many machines and their drives are required to be synchronous (over IM), no permanent magnets (over PMSM), no rotor conductors (over IM), and ease of control. A stator of a SynRM are made as standard smooth polyphase arrangement used in most modern AC machines, while a rotor design are transverse laminated or multiple-flux barrier rotor for which manufacturers use standard mass production techniques similar to those used for squirrel cage induction motor rotors. The idea of rotor design and its optimization aim in order to minimize the air gap harmonics and their effect on torque ripple. Thus, the flux segments and barriers have a purpose to canalize the flux in the motor. Motor efficiency and saliency ratio of transversally laminated rotors can be enhanced by proper placement, proper shape and the proper number of the flux barriers. In this paper will be analysed SynRM (4 poles, 36 slots on the stator, 1500 rpm rotational speed) with and a variety of shapes and number of flux barrier rotor.

synchronous reluctance motor ; optimization ; multiple-flux barrier rotor ; torque characteristic ; FEM

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