Abstract
This paper discusses an inverter-driven single-phase brushless direct-current (BLDC) motor assembled by a housing for a cordless vacuum cleaner. Air gap in the single-phase BLDC motor is asymmetrically designed to satisfy starting and continuous torque by considering voltage fluctuation in a battery. By varying both advance and conduction angles in response to the change of battery voltage, the proposed single-phase BLDC motor with asymmetric air gap is able to maintain sufficient output power. The system efficiency of a vacuum cleaner driven by the proposed motor assembly is estimated by means of fluid dynamics in air watt, and it is also verified experimentally. From the results of the condition of 100,020 r/min, it was confirmed that the motor efficiency was in good agreement with the estimated efficiency, and air flow efficiency of 45.7% and system efficiency of 41.8% were achieved.
Highlights
Consumer electronics markets are rapidly changing from conventional to premium home appliances, with superior performance, convenience, and better design
Competition among premium products is accelerated in cordless vacuum cleaner applications
Attention is paid to a brushless direct-current (BLDC) motor, but there is a lack of literature and research to support this trend
Summary
Consumer electronics markets are rapidly changing from conventional to premium home appliances, with superior performance, convenience, and better design. A universal motor has been used in a conventional vacuum cleaner, but it is not suitable for a premium cleaner requiring high efficiency with high speed [1]. For this reason, attention is paid to a brushless direct-current (BLDC) motor, but there is a lack of literature and research to support this trend. A single-phase BLDC motor for cordless vacuum cleaners is designed to satisfy starting and continuous torque by considering voltage fluctuation in a battery by means of asymmetric air gap.
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