• Title/Summary/Keyword: motor RPM

Search Result 450, Processing Time 0.03 seconds

Design and Characteristic Analysis of an 200[kW], 30000[rpm] Induction Motor for Gearless Turbo Machine (Gearless 터보기기용 200[kW], 30000[rpm] 유도전동기 설계 및 특성 해석)

  • Jo, Won-Young;Woo, Kyung-Il;Cho, Yun-Hyun
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.30 no.3
    • /
    • pp.420-427
    • /
    • 2006
  • This paper describes design and characteristic analysis of the 200[kW], 3000[rpm] induction motor for gearless turbo machine. It was designed by the loading distribution method and the results of characteristics obtained by the equivalent circuit method are compared with the results of circle diagram. To verify the validation of design 2D finite element method is used and also 3D finite element method is used to calculate the current density curve of the rotor bars when they are broken.

Design of Brushless DC Motor Speed Control System for Handpieces (핸드피스용 BLDC 모터 속도 제어시스템의 설계)

  • Kwak, Seong-Woo;Yang, Jung-Min
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.11 no.6
    • /
    • pp.597-604
    • /
    • 2016
  • In this paper, we develope a speed control system of a BLDC motor for handpieces used in beauty applications. To reduce implementation cost, the control system utilizes hall sensors embedded in BLDC motors for speed estimation. The developed power module of a motor uses only 220V home voltage, so that the control system does not need any other power sources. An over-speed limit controller is also developed to slow down a motor when the speed goes up rapidly for a moment upon some heavy load is removed. The control system is designed to operate a handpiece with speed in the range of 5,000~30,000 RPM. Experiment results show the validity of the developed system, which maintains the speed of a motor steady even though a load is varied.

A Study on the Current Minimization of a Outer-Rotor Type BLDC Motor for Low Voltage Application (저전압용 외전형 BLDC 전동기의 소비전류 최소화에 대한 연구)

  • Kim, Han-Deul;Chung, Gyo-Bum;Shin, Pan Seok
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.21 no.2
    • /
    • pp.211-216
    • /
    • 2018
  • This paper presents a numerical optimization technique and switching phase control technique aiming at improvement of efficiency of the low voltage BLDC motor. The optimization technique is performed using the generalized sensitivity technique, response surface method(RSM) and sampling minimization technique. In order to minimize current consumption of the BLDC motor, the switching method of the driving device is optimized using RSM with finite element analysis. The ratings of BLDC motor are 50 W, 24 V, 1200 rpm. As optimizing results, the input current is reduced from 2.78 to 2.51 [A] when the switching phase is shifted by -2.65 [DEG_ELC] at the rated driving speed of 1200 [rpm]. It is confirmed that the proposed method reduces the consuming current of the low voltage BLDC motor through switching phase control method using the numerical optimization method.

Development of An Integrated Controller for a Direct Drive Turbo Compressor (직접 구동방식 터보 압축기를 위한 통합 제어기 개발)

  • 권정혁;변지섭;최중경
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.40 no.4
    • /
    • pp.225-234
    • /
    • 2003
  • Turbo compressors need high speed rotating impeller in structure, high rate gearbox and conventional induction motor. This mechanical system increased moment of inertia and mechanical friction loss. Recently turbo compressor has adopted a super high-speed motor and driver and have made its size smaller and mechanical friction loss at minimum. In this paper, variable super high - speed motor controller, compressor controller and MMI controller are implemented with only one DSP (TMS320VC33) chip for a 150HP, 70,000rpm direct drive turbo compressor. It was required hardware and software integration. The result of integration, Controller hardware became simple and all control software are developed same developing tool. The implements turbo compressor meets the requirements.

Rotordynamics of a Centrifuge Rotor-Bearing System for 100,000 rpm Operation (100,000 rpm 운전용 원심분리기 로터-베어링 시스템의 회전체동역학 해석)

  • 이안성;김영철;박종권
    • Journal of KSNVE
    • /
    • v.8 no.3
    • /
    • pp.450-456
    • /
    • 1998
  • A rotordynamic analysis is performed with a centrifuge rotor-bearing system for the raing speed of 100,000 rpm. The system is composed of a centrifuge rotor(or simply the rotor), flexible shaft, motor rotor and shaft, and two support rolling element bearings of the motor shaft. Design goals are to achieve wide separation margins of critical speeds and favorable unbalance responses of the rotor at the associated critical speeds. The latter requirements are especially important as the system crosses multiple numbers of critical speeds and as the system may not have enough separaton margins around the rating speed. As the system adopts an extra-flexible shaft, it is shown that the rotor has satisfactory small unbalance responses over higher criticals while having an unsatisfactory large one at the first critical. To supress this a bumper ring or guide bearing needs to be installed at a suitable location of the flexible shaft. It is also shown that even with the flexible shaft the dynamics of the motor must be incoporated into the full system model to accurately identify the fourth critical speed, which is close to the rating speed, and higher ones. The analysis is based on the finite element method.

  • PDF

The Development of DSP Based Multi Controller for Direct Drive Method Turbo Compressor (DSP를 이용한 직접 구동방식의 터보 압축기용 통합 제어기 개발)

  • 권정혁;변지섭;최중경;류한성
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.6 no.6
    • /
    • pp.885-890
    • /
    • 2002
  • Turbo compressor needs high speed rotation of impeller in structure, high rated gearbox and conventional induction motor. This mechanical system increased the moment of inertia and mechanical friction loss. Resently the study of turbo compressor applied super high speed motor and drive, removing gearbox made its size small and mechanical friction loss minimum. In this study we tried to develope variable super high speed motor controller, compressor controller and MMI controller under one DSP based systems for 1500Hp, 70,000rpm direct drive Turbo compressor. It have to do unitification of each controller"s hardware and software. The result of study is applied to a 150Hp direct turbo compressor and makes it goods.oods.

A study on driving characteristics of thin ultrasonic motor (박형 초음파 모터의 특성 연구)

  • Jeong, Seong-Su;Park, Tae-Gone
    • Proceedings of the KIEE Conference
    • /
    • 2007.07a
    • /
    • pp.1285-1286
    • /
    • 2007
  • In this study, novel structured thin ultrasonic rotary motor has been proposed. Ultrasonic motors are based on an elliptical motion on the surface of elastic body. ATILA ver. 5.2.4 was used for optimizing stator. The motor was fabricated by using designed stator. And characteristics of the motor were compared with simulated results. When the motor was fabricated with these results, 860[rpm] speed was obtain by input voltage of 16[Vrms] at 92.5[kHz].

  • PDF

Development of Heat Dissipation Measuring System for 1.2-kW BLDC Motor (1.2kW 급 BLDC 모터의 열 발산 측정 시스템 개발)

  • Lee, Injun;Ye, Jungwoo;Lee, Daehun;Hwang, Pyung;Shim, Jaesool
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.37 no.11
    • /
    • pp.1423-1428
    • /
    • 2013
  • In this study, a heat dissipation measurement system is developed to analyze a 1.2-kW BLDC motor. It is important to check the temperature of the motor because an increase in temperature causes problems in the motor insulations, which in turn influences the motor life. A generator for a vehicle is installed to set up a load. We changed the load from 165 to 495 W. While the rpm varies from 2000 to 4000 under various load conditions, the changes in temperature were measured for the operating period by using a thermocouple. The results of experiments conducted under natural convection conditions suggest that the temperature was not stationary with the rpm, load, and coil of the motor and it kept increasing over $120^{\circ}C$. However, under forced convection conditions, the temperature stationarily reached $84^{\circ}C$ after 4000 s. The difference between the maximum and the minimum temperatures was $10-26^{\circ}C$ with an increase in the rpm and load. The orders of high temperature were as follows: motor coil (Ch#1), side of motor surface (Ch#5), inside of motor cap (Ch#2), upper side of motor surface (Ch#4), and inner wall of the motor (Ch#3).

DC Motor Speed Control by Variable Structure PI Control (가변 구조 PI 제어에 의한 직류 전동기의 속도제어)

  • Lee, Sung-Bak;Lee, Jong-Kyu;Won, Young-Jin;Han, Wan-Oak;Cho, Joon-Hee
    • Proceedings of the KIEE Conference
    • /
    • 1992.07b
    • /
    • pp.1225-1227
    • /
    • 1992
  • This paper presents a study on the variable structure PI(proportional and integrate) control which is insensible to the variation of parameters or external disturbance for driving DC motor. In the presented variable structure PI control (VSPIC), the sliding mode control was used at the below of 4000 rpm and PI control also used at the above of 4000 rpm with no load. In other way, the PI control was used at the below of 4000 rpm and the sliding mode control at the above of 4000 rpm with some loading, and then the output waveform following the variation of load was measured. intel 8031 microcomputer unit and IBM PC was combined to form the full system and the speed control was performed with it. The experimental result of the fast response to speed was more improve than it was open loop state. For load varing, the sliding mode insensible to external disturbance was applied and the improved response was obtained.

  • PDF

Development of a Compact Refrigeration Compressor and the Study of Basic Performance for Portable Refrigerator (휴대용 냉동기 적용을 위한 소형 냉동컴프레서 개발 및 기본 성능에 관한 연구)

  • Jang, Jun-Young;Kim, Young-Jun;Nam, Yeon-Woo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.24 no.5
    • /
    • pp.385-390
    • /
    • 2012
  • This paper discusses the applicability of a compact rolling piston refrigeration compressor to portable refrigerators. The capacity of this compressor is 1 cc. Using a 12 V BLDC motor, the compressor is driven from 2500 rpm to 6000 rpm. The height of the compression module and motor is approximately 56 mm, and their weight is approximately 374 g. We confirmed the effective operation of the compressor components by evaluating their compression and cooling performance.