| 摘要 |
A magnetic bearing device is provided which is capable of reducing vibration, as well as electric andmagnetic noise, generated from a pump device while making it possible to control the position of a rotor at high speed and high power. Also provided is a pump device having the magnetic bearing device mounted thereto. Switching is made between a high voltage mode in which an electromagnet coil 151 is supplied with electric power from a high voltage power source 171 and a low voltage mode in which the electromagnet coil 151 is supplied with electric power from a low voltage power source 271. The switching is made based on whether or not a current change speed diL/dt is below a reference current change speed diLs/dt. When the current change speed diL/dt is equal to or larger than the reference current change speed diLs/dt, the device is switched to the high voltage mode. When the current change speed diL/dt is less than the reference current change speed diLs/dt, the device is switched to the low voltage mode. <IMAGE>
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