| 摘要 |
<p>#CMT# #/CMT# The bearing (10) has a ferromagnetic body (16) forming a rotor held without contact between two stator electromagnets (12A, 12B). The electromagnets include respective excitation coils (26A, 26B) supplied with a current from a switching amplifier (18). A control device (22) controls an input signal to the amplifier based on the position of the body relative to magnetic circuits (24A, 24B) of the electromagnets. The control device includes a position estimating unit (30) to estimate the position of the body, and circuits (28A, 28B) to estimate inductance between the electromagnets and the body. #CMT# : #/CMT# An independent claim is also included for a method for controlling an input signal of an active magnetic bearing. #CMT#USE : #/CMT# Active magnetic bearing e.g. radial-type active magnetic bearing or axial type active magnetic bearing (all claimed), with self-position detection for an electrical motor. #CMT#ADVANTAGE : #/CMT# The control device includes the position estimating unit to estimate the position of the ferromagnetic body forming the rotor, and the circuits to estimate the inductance between the electromagnets and the body, thus enabling to reduce the level of disturbance on the calculation of the estimated rotor position as well as the calculation of a compensating signal. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an active magnetic bearing with auto-detection of position, including a rotor, two electromagnets and two circuits to estimate inductance between the rotor and the electromagnets. 10 : Active magnetic bearing 12A, 12B : Stator electromagnets 16 : Ferromagnetic body 18 : Switching amplifier 22 : Control device 24A, 24B : Magnetic circuits 26A, 26B : Excitation coils 28A, 28B : Inductance estimation circuits 30 : Position estimating unit.</p> |
