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This paper describes a mathematical model for the dynamic magnetic power losses in the laminated steel stator of high frequency permanent magnet machines, such as Brushless DC (BLDC) Motors. The model presented is based on a utilization of the dynamic Jiles-Atherton model. Accurate dynamic BH curve fitting and magnetic power loss derivations have been achieved, where the calculated magnetic losses have shown around 95% accuracy from 5 Hz to 2000 Hz, over a flux density range of 1.0 T to 1.6 T. This approach has been applied to estimate the magnetic power loss of a small scale, high frequency (>10,000 rpm) BLDC motor, with calculated and measured losses being in close agreement.

This paper proposes a novel, cost effective grid-connected inverter for a domestic micro combined heat and power (micro-CHP) system. A high frequency (~12,000 rpm), high voltage (~425 Vdc) brushless DC (BLDC) machine is used as the generator. The output of the generator is injected into the grid through a novel grid-connected inverter, utilizing a digital algorithm for the implementation of a constant frequency hysteresis current control. This allows a simplified output filter with smaller components to be employed. A grid synchronization method has also been designed, based on a low-pass filter and a micro-controller to optimize/tune the output power factor. The proposed method is successfully applied to a 500 W, 230 V, 50 Hz grid-connected voltage source inverter (VSI) prototype, where the output of the VSI has been demonstrated to comply with the operating regulations of the domestic distributed power generation systems. Index Terms-Grid-connected voltage source inverter (VSI), hysteresis current control (HCC), constant frequency control, distributed power generation, combined heat and power Manuscript

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