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Control-Based Performance Improvements of a Single-Phase Induction Machine with a Large Air Gap and a Copper-Coated Solid Rotor

This paper demonstrates that, within the context of a rotary anode X-ray tube drive, step function commutation of a single phase induction machine with a phase-shift capacitor offers reduced losses compared to block commutation and rivals the losses achievable with sinusoidal commutation but with significantly less control effort. The start-up behavior resulting from these three different voltage waveforms using the original capacitor value are analyzed by means of 2D-/3D-FEM parameter extraction for an equivalent circuit model and corresponding laboratory tests.