Title :
New displacement sensor for a hybrid magnetic bearing in liquid nitrogen
Author :
Komori, M. ; Kobayashi, H. ; Shiraishi, C.
Author_Institution :
Kyushu Inst. of Technol., Fukuoka, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
This paper describes a newly developed displacement sensor. The displacement sensor is used for a hybrid magnetic bearing in liquid nitrogen. The principle of the displacement sensor is based on a differential transformer. The sensor is found to be useful in liquid nitrogen at 77 K (-196°C). Moreover, the sensor is applied to a hybrid magnetic bearing. The displacement sensor is found to be useful and promising
Keywords :
closed loop systems; coils; differential transformers; displacement measurement; electric sensing devices; low-temperature techniques; magnetic bearings; magnetic levitation; magnetic sensors; position control; superconducting magnets; three-term control; transient response; 77 K; PID controller; PWM circuit; closed loop characteristics; differential transformer; displacement sensor; electromagnets; hybrid magnetic bearing; impulse response; induced voltage; liquid nitrogen; magnetic levitation; magnetic sensor; position control; rotor displacement; secondary coils; superconducting bearing; Coils; Electromagnets; Magnetic levitation; Magnetic liquids; Magnetic sensors; Nitrogen; Pulse width modulation; Superconducting magnets; Temperature sensors; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
