1
David M Lerdman: Electronically commutated motor. General Electric Company, Ralph E Krisher Jr, A Burgess Lowe, October 2, 1979: US04169990 (258 worldwide citation)

A brushless DC motor is constructed with photosensitive device for detecting rotor shaft position. Arcuate permanent magnets on the rotor provide a DC flux field while distributed stationary armature windings, each spanning a fixed number of slots in the armature assembly, provide mutually perpendic ...


2
William R Archer, Roger C Becerra, Brian L Beifus, Mark A Brattoli, Rajendra K Shah: Control system and methods for a multiparameter electronically commutated motor. General Electric Company, Ralph E Krisher Jr, January 7, 1997: US05592058 (173 worldwide citation)

A system which drives a component of a heating, ventilating, and/or air conditioning (HVAC) system in response to a system control signal such as a temperature signal provided by a thermostat. The system includes a motor having a stationary assembly and a rotatable assembly. The rotatable assembly i ...


3
Rajendra K Shah: Method and apparatus for controlling a blower motor in an air handling system. General Electric Company, Ralph E Krisher Jr, December 18, 1990: US04978896 (99 worldwide citation)

Apparatus and method for controlling a motor having a stationary assembly with a plurality of winding stages for carrying motor current and further having a rotatable assembly in driving relation with a blower in an air handling system. The apparatus provides control of the blower speed over a range ...


4
Harold B Harms, Peter B Lytle: Electronically commutated motor. General Electric Company, Ralph E Krisher Jr, May 26, 1987: US04668898 (92 worldwide citation)

An electronically commutated motor has a printed circuit board with opposite sides and a heat dissipating means arranged in spaced apart relation at least in part in the path of at least some of the cooling circulated in the electronically commutated motor by the rotatable assembly thereof. A plural ...


5
Warren F Bessler, John M Hooker, Rajendra K Shah: Variable speed HVAC without controller and responsive to a conventional thermostat. General Electric Company, Ralph E Krisher Jr, April 25, 1995: US05410230 (88 worldwide citation)

A system for conditioning air in a space by heating or cooling the air to change its temperature. A thermostat located within the space generates a two state temperature signal having a cyclic parameter which corresponds to the temperature of the air in the space as it rises and falls. A compressor ...


6
Rajendra K Shah: Heating ventilating and/or air conditioning system having a variable speed indoor blower motor. General Electric Company, Ralph E Krisher Jr, February 20, 1996: US05492273 (87 worldwide citation)

A system which drives an indoor blower of a heating, ventilating, and/or air conditioning (HVAC) system in response to a system control signal. The system control signal has a BLOWER DEMAND state and a BLOWER END DEMAND state. The system comprises a motor having a stationary assembly and a rotatable ...


7
David M Erdman: Refrigeration system and control therefor. General Electric Company, Ralph E Krisher Jr, March 29, 1977: US04015182 (79 worldwide citation)

A refrigeration system is disclosed as comprising a compressor driven by an electronically commutated D.C. motor for circulating a suitable coolant through a condenser and then an evaporator disposed within a chamber or compartment to be cooled. The system is particularly adapted for use as an air c ...


8
Glen C Young, James R Kiefer: Electronically commutated motor for driving a compressor. General Electric Company, Ralph E Krisher Jr, June 13, 1995: US05423192 (78 worldwide citation)

A system which drives a compressor of a refrigeration system at one or more preset speeds. The system includes a motor having a stationary assembly and a rotatable assembly. The stationary assembly includes windings adapted to be commutated in at least one preselected sequence. The rotatable assembl ...


9
Glen C Young: Laundering apparatus. General Electric Company, Ralph E Krisher Jr, February 10, 1987: US04642537 (76 worldwide citation)

Control system for an electronically commutated motor includes circuitry for integrating the back emf of an unenergized motor winding to determine motor rotor position. However, integration should not occur on a field collapse voltage which precedes the back emf. A zero-approaching detector enables ...


10
David M Erdman, James A Beatty, Amritlal H Patel: Control circuits, electronically commutated motor systems and methods. General Electric Company, Ralph E Krisher Jr, June 11, 1991: US05023527 (73 worldwide citation)

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 co ...



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