A magnetic sensor for non-contact measurement of the temperature of a spinning device is studied in the present work. This sensor specifically applies to the control and safe operation of turbo-molecular pumps. The sensing element consists of a “magnetic capsule”, composed of a quasi-ideal permanent magnet with high Curie temperature and a Fe–Ni alloy cylinder, mounted on the rotor, and a detecting coil stuck on the pump frame,where a voltage pulse is induced at every turn by the passage of the capsule. It is demonstrated that the sensor can be designed so as to have a linear voltage-versus-temperature behaviour, where the signal strength depends on the distance between the revolving magnet and a fixed pickup coil and is independent of rotor speed.
Contactless magnetic temperature sensors for turbo-molecular pumps / Bottauscio, Oriano; Chiampi, M; Crotti, Gabriella; Fiorillo, F; Giors, S; Pittà, G; Quartarone, C.. - In: SENSORS AND ACTUATORS. A, PHYSICAL. - ISSN 0924-4247. - A153-2:(2009), pp. 212-217.
Contactless magnetic temperature sensors for turbo-molecular pumps
BOTTAUSCIO, ORIANO;CROTTI, GABRIELLA;
2009
Abstract
A magnetic sensor for non-contact measurement of the temperature of a spinning device is studied in the present work. This sensor specifically applies to the control and safe operation of turbo-molecular pumps. The sensing element consists of a “magnetic capsule”, composed of a quasi-ideal permanent magnet with high Curie temperature and a Fe–Ni alloy cylinder, mounted on the rotor, and a detecting coil stuck on the pump frame,where a voltage pulse is induced at every turn by the passage of the capsule. It is demonstrated that the sensor can be designed so as to have a linear voltage-versus-temperature behaviour, where the signal strength depends on the distance between the revolving magnet and a fixed pickup coil and is independent of rotor speed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
