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    • 29. 发明专利
    • METHOD FOR OPERATING A THREE-PHASE INVERTER OF A CONVERTER-FED MAGNETIC BEARING
    • CA2835551C
    • 2019-06-04
    • CA2835551
    • 2012-04-12
    • SIEMENS AG
    • DENK JOACHIMKOPKEN HANS-GEORGSTOIBER DIETMARVIERING FRANK
    • F16C32/04
    • The invention relates to a method for operating a three-phase inverter (6) of a converter-fed magnetic bearing (2), the two coils (12, 14) of which are connected by a first connection (20, 22) to a respective output (W, V) of the three-phase inverter (6) at one end and are connected by a second connection (24, 26) to each other and to a third output (U) of the three-phase inverter (6) at the other end. According to the invention, a variable control current (2*iq) of the magnetic bearing (2) is injected into an output (U). A constant bias current (id) of the magnetic bearing (2) flows between the two additional outputs (V, W) of the three-phase inverter (6) and thus serially through the two coils (12, 14). In order to form the difference control of the magnetic bearing (2), the control current (2*iq) is divided among the two additional outputs (V, W), such that a control current (iq) flows parallel through the two coils (12, 14). As a result, a converter-fed magnetic bearing (2) is obtained, the operating method of which is further developed in such a manner that the effective current load of the three-phase inverter (6) is significantly reduced and the current rise velocity of the control current of the magnetic bearing (2) is significantly increased.