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RISS 인기검색어
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- 주제어 : 벨트풀리 (검색결과 2 건)
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V 벨트 풀리 드라이브의 결함에 대한 전기적 진단 방법 및 회전자 구조가 전동기 시험에 미치는 영향 분석
V-belt-pulley couplings are commonly used for speed reduction in induction motor driven industrial applications since they provide flexible transmission of power at low cost. However, they are susceptible to mechanical defects such as wear or crack that can lead to slippage or damage of the belt, which reduces the efficiency and lifetime of the system. There are many limitations to applying existing tests, which include visual inspection, thermal or mechanical monitoring, since they require visual or physical access to the motor and/or costly sensors/systems. Considering the large quantity of belt-pulley systems, the impact of economic loss incurred by low-efficiency operation and unplanned process outage can be significant. In this paper, electrical monitoring of belt-pulley coupling defects based on the analysis and trending of the stator current frequency spectrum under steady-state and startup conditions is presented. The proposed method is verified on 1) 6.6 kV motor driven pulpers, and on a 2) custom-built 380 V motor driven air compressor with speed reduction belt-pulleys under controlled fault conditions. It is shown that the proposed method can provide automated, remote, and safe detection of belt-pulley system defects based on current measurement available in the system for improving the system reliability and efficiency. In addition to the above topic, the effect of the rotor construction on motor tests, low voltage rotor test and surge PD test are analyzed and evaluated experimentally. The single-phase rotor rotation test(SPRT) is frequently used in the field for assessing the integrity of the rotor cage without motor disassembly. However, the inconvenience of the SPRT has triggered the advent of a portable low-voltage version of the test. This test has recently become common as it is convenient to use in an industrial environment. However, concerns on the reliability of the test have been raised due to frequent false test indications. The objective of this work is to provide an analysis and experimental evaluation of low-voltage rotor tests under controlled rotor fault conditions on 380-V and 6.6-kV motors. The results of the low-voltage test reveal that it cannot provide reliable diagnosis due to the low excitation flux level, particularly for motors with the closed rotor slot design. Partial discharge (PD) has been identified as one the main root causes of stator winding failures in low voltage (LV) random wound AC motors fed by PWM inverters. To ensure that PWM inverter-fed motors (type I) are PD-free under impulse excitation, the test procedure for acceptance testing of the stator insulation system was developed (IEC TS 60034-18-41). Although many successful cases of applying the TS have been reported, some concerns have been raised. It is implied in the TS that the rotor has no impact on the off-line surge PD test result, and testing is often performed without the rotor; however, it was observed that the test results can change with rotor insertion for some types of machines. The surge PD test must be performed under actual operation condition(with the motor assembled) to guarantee absence of PD. In this paper, the influence of the rotor on the surge PD test is investigated for AC machines, and it is shown that the PD inception voltage (PDIV) can change significantly depending on the rotor design. A detailed analysis is given along with experimental test results on a number of induction and permanent magnet (PM) synchronous motor samples with different rotor designs.
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RAMS 통계분석을 활용한 도시철도 전동차 출입문 부품 고장분석 및 개선에 관한 연구
The entrance and exit system of the city rail system is a device that handles the entry·exit of passengers. However, it is an important device affecting the operation of the city railroads since failure in the event of failure directly affects the safety of the passengers The type of belt-type door system was analyzed using the analysis of the RAMS integrated system statistics that are set up in Busan Metropolitan Railway for improved passenger service and safe operation of the city railroads. As a countermeasure to improve it, First, developing and applying the door belt pulley bearing and upper roller replacement equipment reduced the annual average failure rate of the belt pulley, the bearing, and the upper roller by 56.7 percent. Second, the development and application of the door operated testing machine reduced the annual average failure rate of the door belt pulley bearings and upper rollers by 91.7 percent by recognizing bearing defects and bad assembly conditions before the motor vehicle was shipped. The results are verified by statistical analysis of the RAMS integrated system.
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