• Title/Summary/Keyword: Motors in Household Appliances

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Reestablishment of RPN Evaluation Method in FMEA Procedure for Motors in Household Appliances (가전용 모터의 FMEA 실시 과정에서의 RPN 평가방법 재정립)

  • Kim, S.Y.;Kim, H.G.;Yun, W.Y.
    • Journal of Korean Society for Quality Management
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    • v.35 no.1
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    • pp.1-9
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    • 2007
  • Failure mode and effects analysis (FMEA) is a widely used technique to assess or to improve reliability of products at early stage of design and development. Traditionally, the prioritization of failures for corrective actions is performed by developing a risk priority number (RPN). In practice, due to insufficient evaluation criteria specific to related product and processes, RPN is not properly evaluated. This paper reestablishes an effective methodology for prioritization of failure modes in FMEA procedure. Revised evaluation criteria of RPN are devised and a refined FMEA sheet is Introduced. To verify the proposed methodology, it is applied to RPN evaluation for motors in household appliances.

Three phase Switched Reluctance Motor for 200W rated air conditioner blower (에어컨팬용 3상 SRM(200와트급))

  • Lim Jun-young;Kim Sang-young;Choi Yong-won
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.259-259
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    • 2004
  • To date, induction motors have mainly been used for heating, ventilation, and air conditioning (HVAC) applications, however, there is significant research being done world-wide on the use of switched reluctance motor(SRM) in household home appliances. This papers proposes three phase SRM for the air-conditioner blower that has cost merit and good performance respectively compared with conventional induction motor.

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A Study on a Flux Switching Motor Drive for Fan Application

  • Kim, Nam-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.7
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    • pp.49-56
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    • 2009
  • A new class of electronically commutated brushless motors, the flux-switching motor (FSM), is gradually emerging for use in power tools and household appliances especially fan and pump application thanks to green policies, This motor offers such advantages as high-power density and relatively high efficiency compare to induction motors, and low cost and simple motor structure compare to the BLDC motor. This paper presents the principle of the FSM and design of the 12/6 pole FSM drive system for fan application. Test results of the prototype motor are provided to verify the validity of the fan application with a TMS320F2812 DSP and inverter.

A study for the output power improvement DC servo driver to make remodeling back iron (Soft Magnetic Back Iron의 개선을 통한 servo driver 출력 향상을 위한 연구)

  • 최도순
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 1999.12a
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    • pp.693-700
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    • 1999
  • The Servo motor is consistent with the magnet rotor, winding, magnetic back iron and the sensor. Especially the soft magnetic back iron in the servo motor, which consists of the magnet rotor and winding, and between these two components lies the magnetic circle. Its important to monitor the output power of to make conclusive decision for designs. In these days main household electrical appliances, business machinery and tools are made by process of miniaturization. Because of this miniaturization in hardware, miniaturization of the servo motor is essential But the decrease inside affects the power output. For improve of these has been several attempt at improving the power output of these smaller servo motors. There has been experiment in the servo motor composition, composing of the improvement of the soft magnetic back iron through comparison of the out put power plans are being made.

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Analysis of the Utilization Characteristics of Electrical Power and Equipments on the Farms (농촌의 전력및 전기기기의 이용특성분석)

  • 박승우;류한열
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.17 no.4
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    • pp.3943-3955
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    • 1975
  • The purposes of this study are to evaluate the utilization characteristics of electrical power consumption, to grasp the present trends in the use of electrical equipments, to estimate the demand factor and load factor being held, and to evaluate the efficiency of electical uses for the recently electrified farms cultivating paddy rice. For the purposes, 109 sample farms located in eleven villiages electrified in six different years from 1968 to 1973, were chosen at random and investigated on 35 items concerning to electrical uses and wiring systems. The survey was carried out in 1975, in the vinicity of Suweon city. The results are summarized as follows: i) The average annual power consumption on sample farms is considered to be low, being 242.9 Kwh. in 1974, and varied according to the different electrified year and size of cultivated land, respectively. It has significant positive correlation to the area of farm, too. ii) Between the number of year of electrical uses and the power consumption, there is very significant positive correlation, which could be expressed as Y=43.041+16.108 X, where X represents the number of years of electrical uses. The annual increment of power consumption is much greater at the beginning of the electrification than that at the later years, its average being approximately 20 percent. However, it is recommended that any estimation of long-term increments should be carefully investigated. iii) The monthly power consumption varies considerably throughout a year, in which the heaviest farm load occurs in November. Observing the seasonal variation of consumption, the winter-time is the heaviest season while the summer is the lowest. The result implies house lighting is chief contribution to the present electrical consumption on the farms. Comparing the variation of monthly consumption ratios between the sample farms and industries, the electrical uses on the farms are independant of the industrial uses, and further, the agricultural uses are of inverse pattern to the farms from the results that there is negative correlationship between them, iv) The number of electrical equipments used on the farms are occupied chiefly by lighting sources. Next to the lighting sources, household appliances of small quantity and some motors are used. The mean electrical quantity is about 1, 127.4 watt, which corresponds to about 37.6 per cent to the contracted quantity. The composition of quantity is chiefly occupied by the electrical motor of about 1.5 hp., single-phased. The number of the annual utilization hours of each equipment is tabulated in Table IV-5. In contradiction to the high utilization of lighting sources and small household appliances, the motor is poorly used for approximately 22 hours in a year. v) More than 55 per cent of farms want to purchase new electrical equipments such as small household appliances and electrical motors in their number. The impulse of purchasing such items is stimulated by the contacts to the mass media and their knowledge on such equipments. Consequently, the increase of electrical uses could be prompted by such trials as education and demonstration. vi) The demand and load factors on the farms vary considerably according to the greater variation of the power consumption, daily or monthly. The daily demand factor is 22.4 per cent and load factor 18.6 per cent, while the annual demand factor is 1.3 per cent and load factor 70 per cent approximately. Therefore, the low efficiency of construction cost requires re-evaluation of the present contracted quantity of 3 Kw. or increase of electrical uses. vii) The electrical energy on the farms devoted chiefly to lighten the farm residences does not contribute to the farm incomes. Consequently, the cost of electrical consumption presses considerably upon the farm economy. Therefore, there is great need to build up the electrical uses on the farms through the development of new works and techinques to utilize any electrical equipments on the production of farm products. Further more, such the development should be related to increase the actual income of the farm consumers.

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