Abstract
A single-phase Flux Reversal Machine for high speed applications has a reliable rotor and a good specific power. This paper shows that eliminating the regions of negative torque of this machine can be reached if an asymmetric rotor is used. This machine with an asymmetric rotor was compared with that with a symmetric rotor. In the rated loading mode, the calculated torque ripple of the flux reversal machine with the symmetric rotor is 297%, while that of the one with the asymmetric rotor is 185% which is less by 1.6 times. The proposed high-speed flux reversal machine with the asymmetric rotor can be applied in low-cost drives of household appliances (vacuum cleaners, hand dryers, blenders, washing machines) and in electric power hand tools (angular grinders, miter saws, drills) to replace single-phase synchronous motors or single-phase Hybrid Switched Reluctance Motors.
Highlights
Low-cost single-phase permanent magnet synchronous motors are used in low-power applications of variable speed
This paper demonstrates that eliminating the intervals of negative torque is possible in the Flux Reversal Machines (FRMs) of design [3,6] if an asymmetric rotor is used
The calculated torque ripple of the FRM with the symmetric rotor is 297%, while that of the FRM with the asymmetric rotor is 185% which is less by 1.6 times
Summary
Low-cost single-phase permanent magnet synchronous motors are used in low-power applications of variable speed. Like traditional synchronous motors with magnets on the rotor, FRMs are supplied by bipolar current, which increases the peak-to-peak current sweep at given its maximum and RMS values, compared to the HSRM [3]. These decrease losses in the winding, increase the motor efficiency, and decrease the cost and the size of the FRM DC–AC converter [3]. The characteristics of the single-phase FRM with the symmetric rotor and that with the novel asymmetric rotor are compared for the case of high-speed applications Both configurations are intended to use in low-power household devices (the rated rotational speed is 18 000 rpm, the rated loading torque is 0.4N m, the rated shaft power is 750 W). The calculated torque ripple of the FRM with the symmetric rotor is 297%, while that of the FRM with the asymmetric rotor is 185% which is less by 1.6 times
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