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Influence of stator slot openings on loaded rotor eddy current loss
Pages: 17-24
Year: Issue:  11
Journal: Electric Machines and Control

Keyword:  induction motorsslot openingsharmonic fieldeddy current loss2-D finite element;
Abstract: In order to calculate the eddy current loss in rotor of induction motor precisely and investigate the influence of stator slotting on the loss, a small induction motor with aluminum casting rotor, which has 4 pole pairs and its rated power is 2. 2 kW, was analyzed in detail. The relationship between air gap harmonic magnetic field and stator slot opening was discussed by the theoretical analysis of harmonic mag-netic field in induction motor. Distributions of magnetic field density and eddy current in different posi-tion of rotor were also obtained by using two-dimensional finite element method. Finally, through establis-hing motor models with different stator slot opening, comparative analysis was carried out on the eddy cur-rent loss in rotor core and bars. Simulation result shows that, both the value of harmonic field in air gap and eddy current density in rotor surface increase with stator slot opening. And the eddy current loss of rotor core and bars also increase with it, which rising tendency plays out with a quadratic function expres-sion.
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