| 摘要 |
An inverter unit for driving a motor with multi-phased currents, each of the phases being derived from a.c. input voltages that are applied to respective input terminals, rectified and smoothed by capacitors before being applied to parallel-connected switching elements to develop each of the phased a.c. outputs. The capacitors may be connected in series and/or in parallel together with the switching elements. In order to reduce the effect of the distributed inductance contributed by the conductors used to connect the capacitances and switches, and thus the need for large snubber capacitances to compensate for the distributed inductances, the connectors are given a geometry and an orientation that causes the inductances to be minimized. Specifically, the conductors are of a bus-plate form, having a large area for improving heat dissipation, and an orientation so that the magnitude and direction of currents flowing through the bus-plates tend to minimize the effect of the distributed inductances. The bus-plates may comprise one or more separate conductive plates and may be shaped to provide slots for viewing indicators on the capacitors. |
