Northrop Grumman Systems Corporation

Other

Satcon Technology Corporation

Westinghouse Electric Corporation

William B Hall

Thomas C Underwood

Thomas C Matty

David L Schantz, Jr

Frank A Lindberg

Frank E Altoz

Geoffrey B Lansberry

Ngon B Nguyen

James L Munro

Richard M Young

Marshall G Jones

William B Winkel

Edward T Wagner

Charles S Kerfoot

Michael J Ankrom

James H DeOms

Ronnie L Starling

Patricia A O'Donnell

Brian H Smith

Eric L Mohler

Beth A Herman

Joseph J Springer

Todd M Zaranski

Brian A DeAbreu

Aaron D Valdivia

A rope swinging device includes a strap attached to an optional handgrip, and a clamp attached to the strap. The clamp may be attached to a rope that is swung by a user.

Rope swinging device

A method of using a weight holding device includes the steps of positioning the strap behind a bar, wherein the handgrip is positioned opposite the strap-separating component, and the strap is suspended from the handgrip, raising the lowest portion of the strap, bringing the handgrip through the raised portion of the strap, and pulling the handgrip upwards so that the strap tightens around the bar.

Methods of using a weight holding device

A weight holding device includes a strap and a strap-separating component attached to the strap. The strap-separating component maintains a separation between two portions of said strap when a weight is suspended from said weight holding device. An optional handgrip may be included.

Weight holding device

A device for performing physical exercise includes a substantially rigid elongated pole, an elastic band comprising components for attaching the elastic band to the pole, and an anchor component for securing the elastic band to an external object.

Exercise pole device

An integrated system for comprehensive control of an electric power generation system utilizes state machine control having particularly defined control states and permitted control state transitions. In this way, accurate, dependable and safe control of the electric power generation system is provided. Several of these control states may be utilized in conjunction with a utility outage ride-through technique that compensates for a utility outage by predictably controlling the system to bring the system off-line and to bring the system back on-line when the utility returns. Furthermore, a line synchronization technique synchronizes the generated power with the power on the grid when coming back on-line. The line synchronization technique limits the rate of synchronization to permit undesired transient voltages. The line synchronization technique operates in either a stand-alone mode wherein the line frequency is synthesized or in a connected mode which sensed the grid frequency and synchronizes the generated power to this senses grid frequency. The system also includes power factor control via the line synchronization technique or via an alternative power factor control technique. The result is an integrated system providing a high degree of control for an electric power generation system.

Integrated control system and method for controlling mode, synchronization, power factor, and utility outage ride through for micropower generation systems

Integrated control system and method for controlling mode, synchronization, power factor, and utility outage ride-through for micropower generation systems

A line power unit controls electrical power delivery to a grid from a three phase permanent magnet generator. A line power unit controller receives a power level command and controls a main inverter that draws DC power from a DC bus to deliver the commanded power to a grid. The DC bus is fed DC voltage via a three phase permanent magnet generator and a rectifier. The inverter delivers power to the grid via a filter, transformer and main contactor. The line power unit controller also controls the main contactor to break the connection with the grid. A precharge circuit draws power from the grid to precharge the DC bus to a precharge voltage. Alternatives include a start inverter separate from the main inverter that permits simultaneous delivery of power to the grid and commutation of the permanent magnet generator as a motor to spin an engine connected thereto at a speed sufficient to permit engine starting. Another alternative utilizes a single inverter for engine starting and power delivery which does not permit these operations to be simultaneously performed. Further alternatives include eliminating the transformer by utilizing a high-voltage rated main inverter.

Line power unit for micropower generation

Integrated control system and method for controlling mode,

A communications processor is disclosed for a power generation system that permits data and control signals to be communicated to and from the power generation system and a host computer. The control signals include a power level command and power factor that are sent from a remote host to the power generation system which responds by delivering the requested power level having the desired power factor to a grid. The remote host receives performance data that permits an operator to accurately gauge the performance of the power generation system including the performance and any fault conditions of a line power unit, generator, and engine driving the generator. The communications processor unburdens the line power unit controller that is responsible for controlling power generation from the task of processing input data and driving local displays. The host may also be provided at a location remote from the power generation system. The host, local or remote, preferably includes a graphical user interface that permits an operator to monitor and control the power generation system in an efficient and highly effective manner. A dedicated serial bus connects the communications processors of multiple power generation systems. By utilizing a round-robbin polling of each power generation system across the dedicated serial bus, real-time control can be achieved.

Communications processor remote host and multiple unit control devices

A battery charger which supplies charging current for a high voltage, high current battery in accordance with a charge profile which preferably includes both a charge pulse sequence as well as a discharge pulse sequence. Charging power is obtained from a three phase power line the voltage of which is reduced by an isolation transformer. Conversion of ac to dc is accomplished by a switching transistor power converter having a control for supplying transistor switching signals. The control is responsive to the angle of line voltage, the actual line current and a reference signal indicative of desired charge current, to generate the transistor switching signals. Any deviation between actual and desired current is then corrected by modification of the transistor switching signals.

Apparatus for charging energy storage means from a multiphase power

An electric vehicle propulsion system having a motor with first and second electrically isolated windings and a system control unit for controlling the motor, wherein the system control unit includes a first power bridge for driving the first windings and a second power bridge for driving the second windings.

Electric vehicle propulsion system employing AC induction motor control

Battery charger apparatus

A coolant pump assembly for an electric vehicle includes a positive displacement pump having an inlet port, an outlet port, and a rotor, a variable-speed ac motor having a rotatable shaft mated with the rotor of the pump for rotating the rotor of the pump to circulate coolant through the inlet and outlet ports of the pump, and a motor control unit, communicating with a DC power source of the electric vehicle, for controlling the speed of the motor to provide a variable coolant flow through the electric vehicle.

Electric vehicle coolant pump assembly

Growing community of inventors

Annapolis, MD, United States of America

William B Hall