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The miniaturization and high efficiency of permanent magnet synchronous motors (PMSMs) are desired in numerous applications. PMSMs have a number of design parameters in order to enable miniaturization and high efficiency. One such parameter is the ratio of the external diameter to the stack length (D/L). In this paper, we examine the effect of D/L on torque and efficiency in outer rotor surface permanent...
Silicon steel is mainly used as the core material in motors due to its low cost. However, it is impossible to expect a significant improvement in torque performance unless the problem of magnetic saturation is solved. In order to dramatically improve torque performance, it is necessary to use a rotor and stator core material that has a high saturation flux density. Therefore, this paper describes...
Although motors that use rare-earth permanent magnets typically exhibit high performance, high costs and concerns about the stability of raw material supplies can limit production. This paper proposes a permanent-magnet-assisted synchronous reluctance motor (PMASynRM) with ferrite magnets that do not use rare earth materials. The performance of the proposed PMASynRM is evaluated based on the 2-D finite...
This paper proposes a novel control scheme for wide speed range operation of synchronous reluctance motors. The proposed scheme consists of a combination of maximum torque per ampere control, maximum torque per flux control, flux-weakening control and torque limiting. These controls are based on a mathematical model in a rotating reference frame that is synchronized with the stator flux linkage. The...
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