1
Frank E Wills: Diagnostic system for heat pump. Borg Warner Corporation, James J Jennings Jr, March 27, 1979: US04146085 (80 worldwide citation)

A diagnostic system is provided for apparatus including a heat pump, a thermostat and a logic module intercoupled to regulate operation of the heat pump electro-mechanical units. The normal control and operating circuits for the heat pump are completed over a wiring harness plugged into an electrica ...


2
Frank E Wills: Pulse width modulated inverter system for driving single phase a-c induction motor. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner, November 10, 1987: US04706180 (56 worldwide citation)

A substantially perfect single phase sinusoidal shaped voltage waveform may be generated for driving a single phase a-c induction motor by employing a sinusoidally weighted pulse width modulated signal to switch a pair of solid state power switches on and off in alternation in order to connect the m ...


3
Frank E Wills, Harold R Schnetzka II: AC motor drive system with a two phase power supply. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner, June 8, 1993: US05218283 (47 worldwide citation)

A motor drive system for driving a conventional single phase PSC motor from a two-phase power source which allows for convenient motor direction reversal. In one embodiment, the PSC motor is supplied from a three-phase inverter that is controlled to generate two-phase power. In another embodiment, t ...


4
Frank E Wills, Jacob E Shaffer Jr: Driving system for single phase A-C induction motor. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner, October 12, 1993: US05252905 (43 worldwide citation)

By employing a single phase pulse width modulated inverter system, a-c power line voltage may be effectively converted to single phase, variable amplitude and frequency sinusoidal voltage for driving a single phase a-c induction motor at an adjustable speed. The motor may be driven directly in respo ...


5
Frank E Wills: Control system for AC induction motor. Borg Warner Corporation, James E Tracy, January 10, 1984: US04425539 (30 worldwide citation)

A control system is disclosed for connecting the primary windings of a three-phase AC inducton motor in a delta-connection at heavy loads and for automatically reconnecting the windings in a wye-connection at light loads to effect energy savings. Power sensing means produces a control signal which i ...


6
Frank E Wills, William Leslie Kopko: Variable-speed drive for single-phase motors. Work Smart Energy Enterprises, Rothwell Figg Ernst & Manbeck, September 19, 2000: US06121749 (28 worldwide citation)

A single-phase variable-frequency power supply with two output voltages drives a single-phase AC motor that has a start circuit and main winding. For permanent split-capacitor motors, the power supply maintains a constant voltage to the start winding while it reduces the voltage to the main winding ...


7
Frank E Wills, Harold R Schnetzka II, Roy D Hoffer: AC motor drive system. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner, August 4, 1992: US05136216 (27 worldwide citation)

A motor drive system for driving a conventional single phase PSC motor from a two-phase power source. In one embodiment, the PSC motor is supplied from a three-phase inverter that is controlled to generate two-phase power. In another embodiment, the PSC motor is connectable through a double-pole dou ...


8
Frank E Wills: Pulse width modulated inverter system for driving single phase a-c induction motor at a constant voltage/frequency ratio. March 17, 1987: US04651079 (25 worldwide citation)

A sinusoidally weighted pulse width modulated switching signal may be developed, for operating an inverter to apply sinusoidal voltage to a single phase a-c induction motor, by comparing a triangular voltage waveform of fixed frequency with a variable frequency sine wave voltage, the switching signa ...


9
Frank E Wills, Dean K Norbeck: Refrigeration system and method. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner L, September 17, 1996: US05555736 (22 worldwide citation)

A refrigeration system includes a temperature sensor in a freezing compartment, a temperature sensor in a cooling compartment, an adjustable damper controlling the flow of cooled air from the freezing compartment to the cooling compartment and variable speed drives for fan motors and a compressor mo ...


10
Frank E Wills, Dean K Norbeck: Refrigeration system and method. York International Corporation, Finnegan Henderson Farabow Garrett & Dunner, October 24, 1995: US05460009 (22 worldwide citation)

A refrigeration system includes a temperature sensor in a freezing compartment, a temperature sensor in a cooling compartment, an adjustable damper controlling the flow of cooled air from the freezing compartment to the cooling compartment and variable speed drives for fan motors and a compressor mo ...