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The aim of this paper is to investigate the pole (2p) and slot (Qs) number combinations with concentrated windings to yield a minimum electromagnetic noise resulting from vibration mode order and torque variation. Preferentially, a novel method of finding possible pole and slot number combination is provided based on the new factor, i.e., Ccw called key winding factor. In addition, the relationship...
This paper presents the analytical method for analyzing the electromagnetic noise in fractional slot permanent magnet (PM) motors. The electromagnetic noise is mainly caused by the radial force and the torque variation. On load condition, the radial force density can be evaluated by integrating the open circuit magnetic and the armature reaction field using the conformal mapping and the winding function...
This paper proposes a rotor tooth shaping method to reduce the cogging torque of an axial flux-switching permanent magnet machine. The rotor tooth is shaped in different configurations, including constant, trapezoidal, asymmetrical, extended, and square shapes. 3-D finite element analysis is performed to compare the proposed shapes of rotor tooth. Peak-to-peak cogging torque, fundamental flux linkage,...
This paper proposes a novel 6 slot-4 pole axial flux switching permanent magnet machine using dual-rotor single-stator. The analytical method is used to find offset angle to eliminate even harmonics of flux linkage and back-EMF of a conventional 6 slot-4 pole topology. The analytical method is verified with finite element analysis. Proposed novel topology is also compared with a conventional dual-rotor...
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