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In interior permanent magnet (IPM) machines, dq-axis coordinate system is usually employed to analysis the machine. In commonly, the d-axis is coincided with the axis of pole. However, dq-axis armature reaction will not only affect the amplitude of the PM flux linkage, but also make dq-axis offset from the position under no load condition. These will lead errors for the traditional dq-axis coordinate...
This paper proposes several slot-pole combinations of flux-reversal machines (FRMs) with fractional-slot windings (FSWs) to achieve a larger torque density and a lower pulsating torque. First, the general rules for the determinations of the winding pole pair and slot per pole per phase (SPP) are introduced, and then the feasible slot–pole combinations of three-phase FRMs with FSWs are given. Second,...
The effects of the structural and environmental parameters on coupling loss of leaky rectangular waveguide in tunnel are studied in this paper, the parameters include the tunnel size and the slot period of leaky waveguide. A new approach based on ray tracing method is proposed for computing the distribution of coupling loss above the upside wall of the leaky waveguide. The approach is verified by...
This paper proposes vernier reluctance dual-stator machines with semi-closed slot. The structure of vernier reluctance dual-stator machines with semi-closed slot is firstly given, followed by a comprehensive comparison with the conventional structure in aspects of no load flux linkage, cogging torque and torque. The effect of inner stator shift on the performance of vernier reluctance dual-stator...
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