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This paper compares the radial vibration forces in 10-pole/12-slot fractional-slot SPM and IPM machines which are designed to produce the same output torque, and employ an identical stator but different SPM, V-shape and arc-shape IPM rotor topologies. The airgap field and radial vibration force density distribution as a function of angular position and corresponding space harmonics (vibration modes)...
Cogging torque is one of the important issues for permanent magnet machines. Due to the interaction between the permanent magnets and slotted armature lamination, there exists cogging torque in slotted permanent magnet machines, which may cause noise and vibration. To reduce the cogging torque, the expression of the cogging torque was studied based on the Fourier analysis in this paper. Based on the...
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