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This paper presents a successful design of a high-efficiency interior permanent-magnet generator which keeps terminal voltage constant from no load to rated load under a constant speed. This means the generator does not need the voltage control due to the voltage drop associated with the increase in load. Time-stepping finite-element analysis has been used to successfully predict the electromotive...
This paper presents the new scheme for high-efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation. When the terminal voltage Vi of the hysteresis motor running at synchronous speed is continuously increased up to nVi (n > 1) and then continuously decreased to Vi, input currents are reduced and output power is increased at the same time. Because of this,...
A-single-phase reluctance generator treated in this paper is a kind of a small steam turbine generator. The stator has both 4-pole field and 8-pole armature windings and the iron core has residual magnetism. The rotor is 4-pole and skewed. The no-load induced voltage waveform is computed by using the finite-element method. The computed values taking skew into account agree well with the experimental...
This paper presents the method to determine the optimum values of the capacitance and rotor-slot skew pitch to maximize the efficiency of a single-phase capacitor-run permanent-magnet motor using the time-stepping finite element analysis and response surface methodology. The optimum values of the capacitance and rotor skew pitch to maximize the efficiency at the rated voltage and output are obtained...
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