MAGNETIC BEARING DEVICE, AND VACUUM PUMP PROVIDED WITH SAID MAGNETIC BEARING DEVICE

WIPO Patent Application WO/2014/171222

A1

[Problem] To provide a lower-cost and more compact magnetic bearing device by omitting the DC/DC converter that was conventionally used to obtain a control power supply voltage of the magnetic bearing device, and to provide a vacuum pump provided with said magnetic bearing device. [Solution] This magnetic bearing device is provided with a position detection means which detects the radial position and the axial position of a rotating body, a magnetic bearing means which by means of an electromagnet controls the radial position and the axial position on the basis of the radial position and the axial position detected by the position detection means, an excitation circuit which includes a switching element for connecting and disconnecting the electromagnet and the power source, an electromagnet current detection means which detects as a signal the current in the electromagnet, a power supply voltage detection means which detects as a signal the voltage of the power supply, and a pulse width calculation means which, for each timing, calculates the pulse width for pulse-controlling the switching element, wherein the pulse width is calculated on the basis of the voltage of the power supply detected by the power supply voltage detection means and the current detected by the electromagnet current detection means.

KAWASHIMA TOSHIAKI (JP)

PCT/JP2014/056054

October 23, 2014

March 07, 2014

Click for automatic bibliography generation  

EDWARDS JAPAN LTD (JP)

F16C32/04; H02K7/09

JP2004286045A	2004-10-14
JP2007252094A	2007-09-27
JP2004301322A	2004-10-28
JP2003172354A	2003-06-20
JPH0874849A	1996-03-19
JP2003293980A	2003-10-15
JP2010200524A	2010-09-09

See also references of EP 2988009A4

View/Download PDF      PDF Help

Previous Patent: ROLL FORMING DEVICE

Next Patent: INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, AND PROGRAM