Periodontal probe based on the fluorescent fiber position sensor

A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.

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Whisker-Like Position Sensor for Measuring Physiological Motion

IEEE/ASME Transactions on Mechatronics ◽

10.1109/tmech.2008.2001184 ◽

2008 ◽

Vol 13 (5) ◽

pp. 538-547 ◽

Cited By ~ 19

Author(s):

O. Bebek ◽

M.C. Cavusoglu

Keyword(s):

Position Sensor ◽

Physiological Motion

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Movement Control Method of Magnetic Levitation System Using Eccentricity of Non-Contact Position Sensor

Applied Sciences ◽

10.3390/app11052396 ◽

2021 ◽

Vol 11 (5) ◽

pp. 2396

Author(s):

Jong Suk Lim ◽

Hyung-Woo Lee

Keyword(s):

Motor System ◽

Control Method ◽

Magnetic Levitation ◽

Movement Control ◽

Position Sensor ◽

Semiconductor Wafer ◽

Control Command ◽

Levitation System ◽

Magnetic Levitation System ◽

Contact Position

This paper presents a method of utilizing a non-contact position sensor for the tilting and movement control of a rotor in a rotary magnetic levitation motor system. This system has been studied with the aim of having a relatively simple and highly clean alternative application compared to the spin coater used in the photoresist coating process in the semiconductor wafer process. To eliminate system wear and dust problems, a shaft-and-bearing-free magnetic levitation motor system was designed and a minimal non-contact position sensor was placed. An algorithm capable of preventing derailment and precise movement control by applying only control without additional mechanical devices to this magnetic levitation system was proposed. The proposed algorithm was verified through simulations and experiments, and the validity of the algorithm was verified by deriving a precision control result suitable for the movement control command in units of 0.1 mm at 50 rpm rotation drive.

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