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A novel type of mechanically robust buried magnet rotor structure is proposed for medium speed permanent magnet machines. A machine utilizing the construction is built, tested, and compared to another machine with traditional V-shaped poles. The machine is also simulated using finite element method and the results are compared to tested values. The obtained results demonstrate the feasibility of the construction.

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Finite element analysis of winding losses in electrical machines can be computationally uneconomical. Computationally lighter methods often place restrictions on the winding configuration or have been used for time-harmonic problems only. This paper proposes a domain decomposition type approach for solving this problem. The slots of the machine are modelled by their impulse response functions and coupled together with the rest of the problem. The method places no restrictions on the winding and naturally includes all resistive AC loss components. The method is then evaluated on a 500 kW induction motor. According to the simulations, the method yields precise results 70-100 faster compared to the established finite element approach.Index Terms-Finite element analysis, eddy currents, proximity effects, reduced order systems.

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