• Title/Summary/Keyword: Precision Rotor

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On-line Identification of Rotor Resistance for Sensorless Induction Motors Using Variable Rotor Flux (가변 회전자 자속 지령에 의한 센서리스 유도전동기의 회전자 저항 실시간 동정)

  • Lee Zhen-Guo;Jeong Seok-Kwon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.2
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    • pp.101-109
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    • 2005

  • The newly developed speed sensorless control scheme is proposed to estimate both motor speed and rotor resistance simultaneously using variable rotor flux. The rotor flux is given as sinusoidal waveform with an amplitude and a frequency without affecting precise torque control. Especially the proposed method makes the simultaneous estimation of rotor resistance and speed with high precision even though at the low speed area including a few rpm. Moreover, on-line identification of rotor resistance can be performed simply without calculating troublesome trigonometric functions and complicated integral computation. Therefore, the proposed system can be accomplished by using very cheap microprocessors for several applications. The results of the numerical simulations and experiments demonstrate that this method is effective to estimate the speed and on-line identification of rotor resistance for sensorless induction motors.

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Vibration Control of a Sealed and Pressurized Squeeze Film Damper Supported Rotor (가압 밀봉된 스퀴즈 필름 댐퍼로 지지된 로터의 진동제어)

  • 고영호;이건복;김창호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.589-593
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    • 1995

  • The vibration of rotors in high speed sometimes leads to system failure or reduces the system life, and has a direct connection with stability. In this paper, the system's modelling was conducted in experimentally and the controller was designed to reduce the vibration due to the rotor unbalance using Squeeze Film Damper(SFD). SFD vibration control was achieved in constant rotating speed based on the controller designed. the control was confirmed working quite well in terms of both numerical simulation and experiment.

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4-Axis Decentralized Control of Magnetic Bearing Equipped whth Collocatd Capacitance Sensor (동위형 축전 센서가 장착된 자기베어링의 4 축 분산식 제어)

  • 신동원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.336-340
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    • 1996

  • This paper presents the development of a collocated capacitance sensor and its application to the decentralized PID controller design for 4-axis magnetic bearing system. The main feature of the sensor is that it is made of a compact printed circuit board (PCB) so that it can be built in to the actuator coil of the magnetic bearing unit. The signal processing unit has been also developed. Then, decentralized PED controller is designed using simplified rotor system model. Finally, the experimental results on the performance of the collocated sensor based decentralized PID controller for a magnetic bearing rotor system is presented.

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고속회전용 자기베어링 시스템의 Eddy Current 효과에 관한 연구

  • 경진호;노승국;박종권
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.274-277
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    • 1997

  • Eddy current effect in a high speed rotor suspended by a mangnetic bearing is invstigated using electromagnetic field analysis technique. The non-zero conductivity model of a laminated rotor sleeve is proposed to concern electrical shorting of laminates due to rub, handling or press fit assembly,et al. As the rotating speed increase, the distibution of magnetic flux line is changed and the magnetic forces decrease remarkably. ANSYS Magnetics (version 5.3) is used for the magnetic field analysis.