Modular ac drive controller
AssigneeSiemens Electric Limited
InventorsDavid L. Duff, Nareshroy M. Patel
Life of this patent
Estimating the term…
Abstract
An ac drive controller including a phase assembly for each phase of a polyphase supply to a motor, each phase assembly including an invertor module and a corresponding filter module. The electrical interconnections between each filter module and each invertor module occur through electrically conductive clips and corresponding bus bars to which the electronic switching devices in the invertor are also connected. The filter and invertor module interconnections are located as close as possible to the points where the electronic switching devices are connected to the buses to minimize stray reactances while allowing for simplified assembly and servicing of the controller.
Claims14
An ac drive controller comprising:
- a power convertor to convert ac power supplied to the power convertor into negative and positive dc voltages;
- a plurality of invertor modules each being electrically connected to said power convertor to receive said positive and negative dc voltages and supplying an ac output voltage constituting one phase of a multiphase supply, each invertor module including at least first and second electronic switching devices, said first electronic switching device being connected between said negative dc voltage and said one phase and said second electronic switching device being connected between said positive dc voltage and said one phase, said first and second switching devices being responsive to control signals to supply alternately said negative and positive dc voltages to said one phase;
- a filter for each invertor module removably connected between said negative and positive dc voltages;
- electrical connection means to connect releasably said filters to said dc voltages adjacent the point where said switching devices are connected to said dc voltages to minimize stray reactance introduced by the electrical connection between said filters and said switching devices;
- and
- a control module to supply said control signals to each invertor module.
A phase assembly for use in an ac drive controller comprising:
- an invertor module to receive positive and negative dc voltages and supply an ac output voltage constituting one phase of a multiphase supply, said invertor module including means to receive a positive and a negative dc voltage, at least first and second electronic switching devices, said first electronic switching device being connected between said negative dc voltage and said one phase and said second electronic switching device being connected between said positive dc voltage and said one phase, said first and second switching devices being responsive to control signals to supply alternately said negative and positive dc voltages to said one phase;
- a filter removably connected between said negative and positive dc voltages;
- and
- electrical connection means to connect releasably said filters to said dc voltages adjacent the point where said switching devices are connected to said dc voltages to minimize stray reactance introduced by the electrical connection between said filters and said switching devices.
Dependencies are inferred from the claim text.