Method and apparatus for increasing current capacity of a distributed drive system
First Claim
1. An apparatus for reducing ripple current on a shared DC bus in a distributed motor drive system, wherein the distributed motor drive system includes a plurality of motor drives, each connected to the shared DC bus, and the DC bus includes a set of DC bus wires extending between at least a first portion of the plurality of motor drives and a second portion of the plurality of motor drives, the apparatus comprising:
- a housing operative to be mounted adjacent to one of the plurality of motor drives;
a first set of terminals accessible through a first opening in the housing and configured to receive the DC bus voltage from the set of DC bus wires;
a second set of terminals accessible through a second opening in the housing and configured to receive a set of DC bus bars, wherein the set of DC bus bars are operative to connect the second set of terminals to the adjacent motor drive;
an internal DC bus electrically connected between the first set of terminals and the second set of terminals; and
a plurality of capacitors electrically connected between a positive rail and a negative rail of the internal DC bus.
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Accused Products
Abstract
An improved system for connecting a DC bus cable and a remote motor drive includes a capacitance module and an extension module that may each be mounted adjacent to the remote motor drive. The capacitance module includes a first DC bus connector and a second DC bus connector. The first DC bus connector includes a terminal block configured to receive a pair of conductors for the DC bus. The first DC bus connector further includes a pair of intermediate bus bars where each of the intermediate bus bars are connected at a first end to the terminal block and at a second end to a circuit board contained within the capacitance module. Traces on the circuit board are routed between the second ends of the intermediate bus bars and the second DC bus connector. The second DC bus connector is configured to be connected to DC bus bars.
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Citations
9 Claims
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1. An apparatus for reducing ripple current on a shared DC bus in a distributed motor drive system, wherein the distributed motor drive system includes a plurality of motor drives, each connected to the shared DC bus, and the DC bus includes a set of DC bus wires extending between at least a first portion of the plurality of motor drives and a second portion of the plurality of motor drives, the apparatus comprising:
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a housing operative to be mounted adjacent to one of the plurality of motor drives; a first set of terminals accessible through a first opening in the housing and configured to receive the DC bus voltage from the set of DC bus wires; a second set of terminals accessible through a second opening in the housing and configured to receive a set of DC bus bars, wherein the set of DC bus bars are operative to connect the second set of terminals to the adjacent motor drive; an internal DC bus electrically connected between the first set of terminals and the second set of terminals; and a plurality of capacitors electrically connected between a positive rail and a negative rail of the internal DC bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification