Low-pass filter and electronic speed control system for electric

Details Low-pass filter and electronic speed control system for electric Low-pass filter and electronic speed control system for electric

1994-12-19

1997-11-11

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 96, 307105, H02P 500

Patent

active

056868065

ABSTRACT:
A three-phase, low-pass filter for use in an electronic speed control system and wherein an adjustable speed drive is disposed in signal transmitting relation relative to an electric motor by an electrical conduit having a predetermined length, and wherein each single-phase circuit of the three-phase, low-pass filter includes an inductor having input and output nodes, a first resistor electrically coupled in parallel to the inductor, a second resistor having input and output nodes, and wherein the input node of the second resistor is electrically coupled to the output node of the inductor, and a capacitor having input and output nodes, and wherein the input node of the capacitor is electrically coupled to the output node of the second resistor, and wherein the low-pass filter is electrically coupled to the electrical conduit and operable to substantially filter out frequencies that tend to excite the natural resonant frequency of the electrical conduit.

REFERENCES:
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patent: 4622474 (1986-11-01), Christl et al.
patent: 4700288 (1987-10-01), Baraban et al.
patent: 4864484 (1989-09-01), Krueger et al.
patent: 4939486 (1990-07-01), Bergdahl et al.
patent: 5251120 (1993-10-01), Smith

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