Inverter with constant voltage to frequency ratio output capability
This invention provides an inverter apparatus and method of operation which permits the use of existing CCFT drive circuit technology while preventing CCFT saturation at low output frequencies. A mult... Read More
Inventors: Baker, Donal E.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Integrated drive-generator system
A primary feature of the invention disclosed herein is to provide a new integrated drive generator system structure and which has new and improved size, weight, and mounting characteristics. The integ... Read More
Inventors: Cordner, Michael A.; Flygare, Wayne A.; Grimm, Duane H.;, Assignee: Sundstrand Corporation (Rockford, IL) |
Brushless doubly-fed generator control system
A VSG system converts available energy from a resource, such as steam, hydro or wind, into variable speed rotational mechanical energy with a turbine. The mechanical energy is converted into electrica... Read More
Inventors: Lauw, Hian K.;, Assignee: The State of Oregon acting by and through the State Board of Higher (Eugene, OR) |
Solid state circuit breaker with three phase capability
This invention relates to solid state circuit breakers for controlling the supply of power from an AC supply to a load and particularly to such circuit breakers suitable for application in three-phase... Read More
Inventors: Mitchell, James T.; Billings, William W.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Apparatus for processing energy regenerated by an AC motor
We claim: 1. An apparatus for processing energy regenerated by an AC motor which comprises: a rectifier circuit (2) for supplying a direct current to the lines of a DC power source by rectifying an al... Read More
Inventors: Sakamoto, Keiji; Toyozawa, Yukio;, Assignee: Fanuc Ltd. (Tokyo, JP) |
Induction motor drive circuits
I claim: 1. A drive circuit for a three-phase induction motor, the circuit comprising first and second switching means associated with each phase of the motor, connection means for connecting all the ... Read More
Inventors: Williams, Barry W.;, Assignee: |
PWM control for power converter system utilizing pulse dropping at minimum pulse widths
A feature of the present invention is that a pulse generation unit for supplying a pulse pattern, which determines the ON-OFF timings of the semiconductor devices of a power converter such as an inver... Read More
Inventors: Inaba, Hiromi; Shima, Seiya; Ando, Takeki; Kurosawa, Toshiaki; Mitsui, Nobuo;, Assignee: Hitachi, Ltd. (Tokyo, JP) |
Circuitry for electronically commutating a direct-current motor
The object of the invention is to ensure that the motor will always be at optimum torque. This object is attained by way of the invention recited in the major claim. Further embodiments that attain th... Read More
Inventors: Gleim, Gunter;, Assignee: Deutsche-Thomson Brandt GmbH (Villingen, DE) |
Method for the formation of the actual load angle value for a field-oriented regulated rotary field machine and corresponding regulation
With field-orientation it is achieved that the field-parallel and the field-perpendicular components of the nominal current vector can be impressed on the machine independently of each other. The fiel... Read More
Inventors: Reng, Leonhard;, Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE) |
Pressure constraint of a rotating article such as a flywheel
Accordingly, it is an object of this invention to provide a design for rotating articles whereby the maximum kinetic energy per unit mass which they can tolerate before breaking up is increased. It is... Read More
Inventors: Lois, Lambros;, Assignee: |
Supplemental automotive vehicular heater system and method of providing same
Briefly, in accordance with the invention, a transformer is coupled to the stator windings of the alternator of the vehicle so that the voltage regulator forces the alternator to operate at an elevate... Read More
Inventors: Offiler, Stephen B.; Berg, Peter G.; Kawate, Keith W.;, Assignee: Texas Instruments Incorporated (Dallas, TX) |
Multiphase frequency selective phase locked loop with multiphase sinusoidal and digital outputs
A circuit for providing a multiphase digitally synthesized sinusoidal output signal representative of a predetermined symmetrical component set of a multiphase source signal and having a predetermined... Read More
Inventors: Stacey, Eric J.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Programmable appliance controller
The present invention provides an appliance programmable controller which utilizes a cyclically operated mechanism such as a rotating cam drum for causing actuation of a plurality of appliance functio... Read More
Inventors: Hamilton, Martin W.; Baran, Michael; King, Todd; Leverque, Denis;, Assignee: Eaton Corporation (Cleveland, OH) |
Synchronous phase marker and amplitude detector
It is, therefore, an object of the present invention to provide an instrument capable of accurately measuring the average flow velocity or volume flowrate of an arbitrary fluid, e.g., a gas, a liquid ... Read More
Inventors: Potzick, James E.; Robertson, Baldwin;, Assignee: The United States of America as represented by the Secretary of Commerce (Washington, DC) |
Digital pulse width modulation control of brushless DC motors
The present invention is an improved torque controller for brushless DC motors which provides precise torque commands of even small magnitude. With the invention, the torque command is applied to the ... Read More
Inventors: Maney, John J.;, Assignee: Harris Corporation (Melbourne, FL) |
Concrete vibrator
An object of the preset invention is to provide a concrete vibrator which is entirely free from the aforementioned various shortcomings of conventional concrete vibrators which employ, as the driving ... Read More
Inventors: Yoshida, Kenji; Shionoya, Akinobu; Matsushita, Kazuo; Baba, Isao;, Assignee: Sinano Electric Co., Ltd. (Tokyo, JP); Mikasa Sangyo Kabushiki Kaisha (Tokyo, JP) |
Dynamic drag arrangement for electrically propelled traction vehicles
FIG. 1 is a simplified block diagram of an electrical propulsion system according to the present invention. A control (not shown), which may be, for example, a speed control pedal or a throttle contr... Read More
Inventors: Gardner, Alvin Leonard; Turley, Barry Jay;, Assignee: General Electric Company (Erie, PA) |
Voice coil motor
It is therefore a primary object of the present invention to provide an improved construction for the shorted turn of a voice coil motor which will save cost and reduce the access time of the motor. I... Read More
Inventors: Hsiao, Yen-Yuan; Wu, Nan-Yang; Cheng, Sheng-Fang;, Assignee: Industrial Technology Research Institute (Hsinchu, TW) |
Vibratory acoustic compressor
It is a primary object of the present invention to provide an acoustic compressor capable of generating acoustic waveforms at extremely high pressures. Such a compressor is particularly suitable for i... Read More
Inventors: van Namen, Frederik T.;, Assignee: Harman International Industries, Inc. (Northridge, CA) |
Dynamic input method and apparatus for programmable controller
The object of this invention is to eliminate the above-described difficulties accompanying a conventional programmable controller. More specifically, the invention provides a dynamic input method for ... Read More
Inventors: Itoh, Tatsuo; Ito, Hisayoshi; Murasaki, Kiyomi;, Assignee: Mitsubishi Denki K.K. (Tokyo, JP) |
Underground trolley vehicle with brushless D.C. Motor
What we claim is: 1. A mining vehicle for use on a high voltage, D.C. trolley system of the type having an overhead high voltage conductor and a pair of parallel rails at ground potential, said mining... Read More
Inventors: Bartholow, Jess; Bartholow, Michael L.;, Assignee: Balco, Inc. (Blairsville, PA) |
Moldable polyphenylenesulfide
OF THE PREFERRED EMBODIMENTS The PPS in the moldable PPS for injection molding or extrusion molding is obtained by the heat-treatment of a partially crosslinked or noncrosslinked PPS at a temperature... Read More
Inventors: Narisawa, Shigeyuki; Yanase, Hiroshi; Kanno, Fukuo;, Assignee: Asahi Glass Company, Ltd. (Tokyo, JP) |
Pile warp tension control in a loom
What is claimed is: 1. A loom comprising at least one warp-tensioning element for moving into a path of warp yarns extending to and forming at least a top shed to deflect the warp yarns therefrom into... Read More
Inventors: Vogel, Rudolf; Ruedisueli, Anton;, Assignee: Sulzer Brothers Limited (Winterthur, CH) |
Motor control circuit
OF THE PREFERRED EMBODIMENTS The FIGURE shows, as part of a circuit arrangement for the triggering of motors in a block schematic diagram, a number of electricity sources which can be connected via a... Read More
Inventors: Gleim, Gunter;, Assignee: Deutsche Thomson-Brandt GmbH (DE) |
Dual polarity fast discharge integrator apparatus
A lead 10 in FIG. 1 supplies input signals through a resistor 12 to an inverting input of an operational amplifier generally designated as 14 and also through a resistor 16 to an inverting input of a... Read More
Inventors: Rhodes, Melvin H.;, Assignee: Rockwell International Corporation (El Segundo, CA) |
Servo motor control apparatus
We claim: 1. A servo motor control apparatus having a motor velocity feedback loop, with a motor torque feedback loop or motor current feedback loop formed inside the velocity feedback loop, a velocit... Read More
Inventors: Yamamoto, Yoichi; Tohya, Takayuki; Hiraga, Yoshiji;, Assignee: Kabushiki Kaisha Yaskawa Denki Seisakusho (Fukuoka, JP) |
Electronic control circuit for brushless direct current motor
OF THE INVENTION As illustrated by FIG. 1, an inverter 10 supplies current to three phases of the brushless direct current motor 20, which is formed of three stator windings 21, 22 and 23 herein repr... Read More
Inventors: Schwarz, Marcos G.;, Assignee: |
Self adaptive speed control system
The present invention controls the head or load velocity not by providing an accurate tachometer indication of the load velocity as in the case of the aforedescribed prior art systems but rather by de... Read More
Inventors: Rose, Andrew M.;, Assignee: Sperry Rand Corporation (New York, NY) |
Magnetostatic wave (MSW) filter with sharp upper cut-off frequency and channelizer formed therefrom
In the present invention the upper edge of the frequency response of the magnetostatic wave (MSW) filter is sharpened. A band limiting element (BLE) is coupled to the MSW filter, preferably in the fil... Read More
Inventors: Buck, Daniel C.; Stitzer, Steven N.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Door controller for mass transit vehicles
What is claimed is: 1. A door controller for transient vehicles having one or more doors and having a primary control system for controlling movement of the vehicle, mechanical linkage shiftably inter... Read More
Inventors: Mahoney, John C.;, Assignee: |
Generators or Motors 
