Abstract
This article describes a rotor making technology for the production of high-efficiency single-phase induction motors (SPIMs) to be used in refrigerator compressors. Rotors can have different aluminum fill factors according to the fabrication method. In order to examine the association between the fill factor and the efficiency of the rotor, we analyzed the distribution of magnetic flux density using the finite element method (FEM). Next, we made prototype rotors by conventional casting methods and by the proposed casting method and compared their fill factors. In addition, SPIMs were made using the rotors, and their efficiencies were measured using a dynamometer. Moreover, the SPIMs were put to use in a compressor, for testing, and for each SPIM the refrigerating capacity of the compressor was measured with a calorimeter. Based on the results of the FEM analysis of the magnetic flux density and the experiments, the reliability and validity of the proposed method were proven.
Highlights
The use of electric motors as the power sources of machines and equipment is increasing gradually in today’s industries, and most of them are induction motors (IMs)
Themethods, prototype were made by the conventional pressure die‐casting and centrifugal casting by proposed centrifugal casting and part they were through casting methods, and by the proposed casting method, and they were compared through wereexperiments
In order to exclude the influence of other variables related to motor efficiency except the fill factor, the experiment used the same measurement variables related to motor efficiency except the fill factor, the experiment used the same conditions forconditions each rotor.for
Summary
The use of electric motors as the power sources of machines and equipment is increasing gradually in today’s industries, and most of them are induction motors (IMs). Because SPIMs can use commercial power (110 V~220 V) as it is without additional power switching devices, they are used commonly for home appliances— as the driving system of refrigerators and air-conditioners. These days, home appliances demand higher electric energy for their diverse functions and enlarged capacity, and this is raising a problem with regard to the performance of SPIMs as sources of mechanical power. In order to solve the performance problem, IMs have been replaced by the low-power and high-efficiency brushless direct current motors (BLDCMs). A BLDCM has a rotor with an interior permanent magnet and an additional controller is required in order to control the rotor
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