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In three-phase induction machines, the non-sinusoidal winding distribution normally causes space harmonics in the air-gap field, with negative impacts on stray-load losses and parasitic torques. An appropriate coil pitch choice is a traditional design strategy to improve the air-gap field waveform. In this paper an alternative technique is investigated based on using stator coils with unequal size...
This paper analyzed the no load air gap flux density waveform of surface mounted permanent magnet synchronous motor (PMSM) and then proposed a new method to improve the air gap flux density waveform. Multiple permanent magnets are adopted as a main pole for motor instead of a single one, and the mathematical model to eliminate the harmonics is derived. According to the mathematical model, a PMSM finite...
A method for coupling the stator and rotor fields of induction motors in time harmonic finite element (FE) analysis with consideration of space harmonics is presented. The coupling scheme is derived from Fourier series of the magnetic vector potential at air-gap interface conditions. A transformation technique is used to introduce the coupling scheme in the saturated time harmonic FEs model coupled...
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