MAGNETIC BEARING DEVICE

PURPOSE:To provide a magnetic bearing device having a moving distance detecting means by which inductance L of a coil, that is, only gap length information X can be detected by removing influence of a duty ratio component from a switching ripple current signal and influence of a frequency (a control...

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Bibliographic Details
Main Authors SHINOZAKI HIROYUKI, SHIRAO YUJI
Format Patent
LanguageEnglish
Published 17.03.1995
Edition6
Subjects
BEARINGS
BLASTING
ELEMENTS OR CRANKSHAFT MECHANISMS
ENGINEERING ELEMENTS AND UNITS
FLEXIBLE SHAFTS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
ROTARY BODIES OTHER THAN GEARING ELEMENTS
SHAFTS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:PURPOSE:To provide a magnetic bearing device having a moving distance detecting means by which inductance L of a coil, that is, only gap length information X can be detected by removing influence of a duty ratio component from a switching ripple current signal and influence of a frequency (a control frequency area and a variation in a DC component) component lower than a switching frequency can be removed. CONSTITUTION:In a magnetic bearing device which has a pulse width modulating(PWM) type electric power supply 21 and a means to detect a moving distance of a body 13 to be supported and supports the body 13 to be supported in a noncontact condition by magnetic forec of a switching ripple current supplied to an electromagnet of the electric power supply 21, the means to detect the moving distance of the body 13 to be supported has means 17 and 18 to measure a rise and a fall in the switching ripple current, and estimates the moving distance of the body 13 to be supported from the switching ripple current signal.
Bibliography:Application Number: JP19930240530