Inverter unit with improved bus-plate configuration
First Claim
1. An inverter unit comprising:
- a plurality of capacitors for smoothing a direct current, each of said capacitors having a capacitor pole surface containing first polarity capacitor poles and second polarity capacitor poles and defining a first pole surface area;
a plurality of switching elements for inverting said direct current into an alternating current, each of said switching elements having a switching pole surface containing first polarity switching poles and second polarity switching poles and defining a second pole surface area;
insulating plate means for providing electrical insulation and defining an insulating surface area;
first bus-plate means for electrically connecting said first polarity capacitor poles and said first polarity switching poles, said first bus-plate means defining a first plate area that is at least the size of the area defined by the total of said first and second surface areas;
second bus-plate means for connecting said second polarity capacitor poles of said capacitors and said second polarity switching poles, said second bus-plate means defining a second plate area;
said first and second bus-plate means being disposed with said first plate area and said second plate area substantially adjacent to each other and said insulating plate being disposed therebetween.
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Accused Products
Abstract
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.
87 Citations
16 Claims
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1. An inverter unit comprising:
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a plurality of capacitors for smoothing a direct current, each of said capacitors having a capacitor pole surface containing first polarity capacitor poles and second polarity capacitor poles and defining a first pole surface area; a plurality of switching elements for inverting said direct current into an alternating current, each of said switching elements having a switching pole surface containing first polarity switching poles and second polarity switching poles and defining a second pole surface area; insulating plate means for providing electrical insulation and defining an insulating surface area; first bus-plate means for electrically connecting said first polarity capacitor poles and said first polarity switching poles, said first bus-plate means defining a first plate area that is at least the size of the area defined by the total of said first and second surface areas; second bus-plate means for connecting said second polarity capacitor poles of said capacitors and said second polarity switching poles, said second bus-plate means defining a second plate area; said first and second bus-plate means being disposed with said first plate area and said second plate area substantially adjacent to each other and said insulating plate being disposed therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification