| 摘要 |
Power of three-phase AC mains is directly converted to DC power by a DC matrix converter employing insulated gate bipolar power transistors to directly connect the AC mains to an elevator DC motor for periods of time which are short compared with the period of the AC voltage, so as to continuously synthesize the desired AC voltage to the elevator motor. Filters are provided at the input and output of the DC matrix converters. Separate DC matrix converters may supply both the armature current and the field current to an elevator motor. Signals for selectively gating the power transistors are provided by converter control logic in response to a conventional phased locked loop, an elevator motion controller, and position speed and current control logic.
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