| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved position detection device of active magnetic bearings which provides for reduced power consumption and further integration benefit.SOLUTION: A position detection device (10) of active magnetic bearings maintaining the position of a rotating shaft comprises two sensing inductance coils (12A, 12B). The position detection device further comprises: a programmable digital component (16) for generating a 25 KHz square waveform signal; a current amplifier (18; 20A, 20B) receiving the 25 KHz square waveform signal and injecting two identical control currents into the two sensing inductance coils; a differential amplifier (22) for amplifying a voltage difference between the resulting voltages in the two sensing inductance coils, depending on the displacement of the rotating shaft; and an A/D converter (24) for delivering a position value from the voltage difference.SELECTED DRAWING: Figure 1 |
