| 摘要 |
A power control system ( 12 ) for an electric motor having at least one magnetic bearing includes a DC/DC converter ( 18 ) supplied from a DC link bus ( 179 ) connected to a main power supply ( 14 ), the bus ( 17 ) supplying power for the electric motor and for a bearing actuator the converter ( 18 ) provides low voltage DC power supplies for a motor controller ( 23 ), a bearing controller ( 24 ) and a supervisory controller ( 26 ), the later monitoring the main power supply and communicating with the motor controller ( 23 ) and bearing controller ( 24 ) so as to cause the motor to operate as a generator in the event of a failure of the main power supply ( 14 ) to thereby supply power to the DC link bus ( 17 ) to maintain operation of the magnetic bearing. Circuit switching components are connected to the motor winding and selectively switched in a manner causing current generated in the motor winding to flow in one direction into the DC link bus ( 17 ) only while the winding voltage is greater than that of the DC link bus ( 17 ).
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