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A Fast Permanent Magnet Width Determination Method for Multiple-Layer Flux-Barrier Permanent Magnet-Assisted Reluctance Machines
Abstract:
In order to maximize the reluctance torque component, multiple-layer flux
barriers are usually employed in permanent magnet-assisted synchronous
reluctance (PMAREL) motors. However, the permanent magnet (PM) dimension of each
layer should be carefully designed to achieve the best performance with the
minimum PM material. This article investigates this issue and proposes a method
to define the PM width according to the sinusoidal no-load airgap flux density
distribution. First, the accuracy of the no-load magnetic circuit for airgap
flux density calculation is verified with finite element analysis (FEA),
considering single or multiple flux-barriers per pole. The effects of the
location, width, and thickness of the PM are investigated separately. Then the
PM width is derived by the equations developed from the no-load magnetic
circuit. The proposed method reduces both the PM mass and the torque ripple.
This approach provides a fast and efficient way to determine the width of the
magnets in different layers of flux barriers.