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This paper presents a successful automatic voltage regulation of high-efficiency interior permanent-magnet (IPM) synchronous generators for pico-hydro power generation system. A 1-kW 4-pole V-type IPM generator with low voltage regulation is used for laboratory test in stand-alone hydro energy conversion system. It has been found from experimental results that the constant output voltage is supplied...
Over the past 25 years, line-start fractional horsepower interior permanent magnet synchronous motors have expanded their presence in the domestic marketplace from few specialized niche markets in high efficiency machine tools, household appliances, small utility motors and servo drives to mass-produced applications. A closer examination reveals that several different knowledge-based technological...
This paper presents a novel single-phase reluctance generator with low-cost ferrite magnets between adjacent stator teeth. The stator has both 4-pole field and 8-pole armature windings. The armature windings are connected to the input terminals of a single-phase full-bridge rectifier circuit as AC power source. The DC output terminals are connected to the field windings to increase the excited flux...
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,...
This paper describes the effects of cage-bars for the stability of circumferentially magnetized permanent-magnet synchronous generators when the load changes. Two kinds of the generators whose rotors have cage-bars and no cage-bars have been made and used for the measurement of the load characteristics. In addition, a conventional interior permanent-magnet synchronous generator without cage-bars is...
This paper presents a numerical analysis method to accurately predict the steady-state and transient performance of a single-phase capacitor-run permanent-magnet motor with skewed rotor slots. Two-dimensional time-stepping finite-element analysis has been used to successfully predict the steady-state and dynamic transient performance of the prototype motor by using a multislice model. The agreement...
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 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, the...
This paper presents the novel starting performance analysis for a single-phase capacitor-run permanent magnet motor with skewed rotor slots. 2-D time-stepping finite element analysis has been used to successfully predict the starting performance of the prototype motor by using a multislice model. The agreement between computed and measured results of the prototype motor validates the proposed analysis...
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