05023527 is referenced by 79 patents and cites 185 patents.

Control circuit for an electronically commutated motor which has a rotatable assembly and further has a stationary assembly with a plurality of winding stages having terminals for energization, and switches for applying a voltage to one or more of the terminals of the winding stages at a time and commutating the winding stages in a preselected sequence to rotate the rotatable assembly. A preselected sequence of winding stages are left correspondingly unpowered so that a plurality of the winding stages are unpowered at some time. The winding stages generate back emf signals and also couple electrical signals from each energized winding stage to the unpowered winding stages which signals can interfere with detection of back emf for position sensing purposes. The control circuit includes a first circuit for selecting at least two of the unpowered winding stages which have electrical signals coupled to them that have a predetermined relationship in polarity and magnitude. A second circuit produces an electrical output from the voltages on the winding stage terminals of the winding stages selected, so that the electrical signals coupled from each energized winding stage are substantially canceled when they have the predetermined relationship while the back emf is preserved for position sensing substantially free from interference from the electrical signals that are coupled from each energized winding stage to the unpowered winding stages. Other control circuits, electronically commutated motor systems and methods of control and operation are also disclosed.

Title
Control circuits, electronically commutated motor systems and methods
Application Number
482407
Publication Number
5023527
Application Date
April 18, 1990
Publication Date
June 11, 1991
Inventor
Amritlal H Patel
Fort Wayne
IN, US
James A Beatty
Fort Wayne
IN, US
David M Erdman
Fort Wayne
IN, US
Agent
Ralph E Krisher Jr
Assignee
General Electric Company
IN, US
IPC
H02P 6/02
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