Abstract
The spoke-type permanent magnet synchronous motor (PMSM), which is a general ferrite magnetic flux-concentrated motor, has a low portion of reluctance torque at the total torque magnitude. Therefore, as a way to increase the reluctance torque, there is a double-layer spoke-type PMSM that can maximize the difference in inductance between the d-axis and the q-axis. However, in the double-layer spoke-type PMSM, cogging torque, torque ripple, and total harmonic distortion (THD) increase with reluctance torque, which is the main cause of vibration and noise. In this paper, a method is proposed that provides the same effect as skew without dividing stages of the permanent magnet by dividing the core of the rotor into two types so that it is easy to manufacture according to the number of stages, unlike extant skew methods. Based on the method, the reduction in cogging torque and THD was verified by finite element analysis (FEA).
Highlights
The spoke-type permanent magnet synchronous motor (PMSM) concentrates the magnetic flux density and can replace the NdFeB magnet used in the extant PMSM with a ferrite magnet
In general spoke-type PMSM, the portion of reluctance torque is low because the difference in inductance between the d-axis and the q-axis is not large
The stack1 cuts the left part fixing the permanent magnet, and the stack2 cuts the right part fixin2goft1h4e permanent magnet to apply the same effect as skew. This is expressed as a core skew, and through this core skew, the design to reduce cogging torque, torque ripple, carnodssT-sHtaDckiesdcoinntdouscttaecdk1wahnilde sctoancksi2dseorinthgapt rthoedupcetrimviatyn.ent magnet can be inserted in one shape as the conventional shape. 1.2
Summary
The general interior permanent magnet synchronous motor (IPMSM) uses NdFeB magnets to take advantage of the high airgap magnetic flux density. The stack cuts the left part fixing the permanent magnet, and the stack cuts the right part fixin2goft1h4e permanent magnet to apply the same effect as skew In this paper, this is expressed as a core skew, and through this core skew, the design to reduce cogging torque, torque ripple, carnodssT-sHtaDckiesdcoinntdouscttaecdk1wahnilde sctoancksi2dseorinthgapt rthoedupcetrimviatyn.ent magnet can be inserted in one shape as the conventional shape. CTohnevreenfotiroen,atlhMe osdhealpSepeocfiftichaetiroontsor core is divided into stack and stack so that the permIannethnitsmpaapgenre,tacsatnudbye tionsreerdtuedceincoogngeinsghatopreqause,bteofroqrueearnidppclreo,sasn-sdtaTcHkeDdf.oTrhaedsotaucbkle1cluaytsetrhseploekfte-ptayrptefimxiontgorthweapsecromnadnuecnttedmbaygnsetl,eactnindgthaewstaaschkin2gcumtsactheinreigmhtoptoarrthfiavxing twheo poepremraatninegntamreags:nLeot wto sappepeldy athned shaimghesepffeeecdt.as skew. In this paper, this is expressed as a core sWkeaws,hainngd mtharochuignhetmhiostcoorrseasrkeewcl,atshseifideedsiignntototwreodutycpeecso:gBgeinltg-tytoprequmeo, torqaunedridpiprelec,t adnrdivTeHtyDpeis.
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