An experimental investigation is conducted to determine the behaviour of brushless PM synchronous machine parameters in the high speed flux weakening operating range. Real-time operating characteristics are determined for two commercially available 4 N•m interior PM synchronous machines. Special computer assisted measuring techniques are employed using an experimental vector controlled drive, capable of providing sinusoidal excitation waveforms at up to 8000 rpm. Perturbation analysis is performed on the measured data and results are applied to a variation of the classical d-q axis equivalent circuit model. The experimental results are repeatable and show a significant variation in the machine parameters as a function of the torque angle. Magnetic non-linearities are also identified and accounted for through recomputation of the machine model over a wide range of operating points. The authors demonstrate that all tests can be performed with no previous knowledge of manufacturer proprietary information or results from finite element simulation.

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The measurement of the total losses of electrical machines is of most interest to designers for verifying their calculations. These measurements can be done in various ways, however, some lead to more accurate results than others. We will show why the conventional input-output procedure does not result in accurate loss figures. An alternate method is proposed. For this purpose a calorimetric measurement facility was designed and implemented. This paper is intended to present the calibration procedure for this facility, as well as results of tests performed on a 10 hp induction motor.

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