Abstract
ABSTRACT Surface loss due to higher harmonic magnetic flux in solid pole synchronous motor is generally quite significant. This loss is present in both synchronous and solid rotor induction motors. Grooving may be adopted as a method to reduce the surface loss of the solid pole. As the presence of the grooves on solid poles causes a part of the eddy current which is considered as an end effect problem, strictly theoretical solution of the problem is extremely difficult. In this paper loss equation of two layer rotor construction and approximate equation of the loss equation are analyzed. If the depth of the groove is small compared with the depth of harmonic flux penetration, the part of the solid pole surface is considered partly to be the two layer rotor construction. Measured value of surface loss of grooved solid rotor is described and studied by considering the end effect. Correction cofficient kr1, about the end effect is obtained by the experiment. The surface loss reduction factor is also obtained...
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