Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7164243 | System and method for establishing motor efficiency during balanced or unbalanced operating conditions A system and method for establishing a plurality of operating parameters of a multiphase motor. The plurality of electrical parameters may be established from stator resistance data and electrical input data. The system and method may be used to decompose the electr... | 01/16/2007 |
| 7106011 | Web roller assist drive An assist drive assembly for adjusting tension in a web generated when the web is moved over a roller in a contacting relationship therewith. A plurality of north and south pole elements are disposed about the roller. A controller is coupled to a magnetic pole senso... | 09/12/2006 |
| 6759826 | Control strategy for switched reluctance drive systems A switched reluctance drive is supplied from a power source and has a DC link, across which is a DC link capacitor. The phases of the machine are controlled by a controller which controls the switches connecting each phase winding to the DC link. The controller swit... | 07/06/2004 |
| 6605917 | Method and a device for controlling and regulating an alternating current rotating electrical machine, in particular a synchronous alternating current rotating electrical machine A method of regulating a rotating electrical machine includes a preparatory step of determining a discrete voltage control law for the machine. The discrete control voltage to be applied at each sampling time is determined in the form of a first term corr... | 08/12/2003 |
| 6465981 | Adaptive anti-windup method and apparatus for disc drive servo control A method and apparatus are provided for positioning a head over a disc in a disc drive while maintaining servo loop stability. The apparatus includes an actuator-head assembly having a large-scale actuator and a micro-actuator that are both able to move t... | 10/15/2002 |
| 6404160 | Numerical control apparatus In a numerical control apparatus 1, a synchronous control management unit 11 manages the dominant relation of plural axes to be controlled synchronously. In case of the position control system, in the axis control unit which controls the reference axis, a... | 06/11/2002 |
| 6359409 | Encoder An encoder operates in accordance with the transparent scanning principle. The encoder includes a rotating shaft, a partial disk connected nonrotatably concentrically with the shaft, an illuminating unit, and a scanning receiver located axially in front o... | 03/19/2002 |
| 5514978 | Stator turn fault detector for AC motor Motor current and voltage waveforms are measured and converted to digitized current and voltage waveforms. A weighted discrete fourier transform is applied to the digitized current and voltage waveforms to obtain negative sequence current and voltage phas... | 05/07/1996 |
| 5485064 | Self-synchronous motor and electrical traction system using a self-synchronous motor A self-synchronous electrical motor comprises a rotor, a stator formed by stator windings, at least one electronic switch series-connected with a stator winding to control a mean current in the winding, a sensor of the angular position of the rotor to con... | 01/16/1996 |
| 5473227 | Self-synchronous electrical motor A self-synchronous electrical motor comprises one rotor, one stator formed by at least one set of four stator windings, at least one electronic switch connected to a stator winding to control the current in the stator winding and a sensor of the angular p... | 12/05/1995 |
| 5389866 | Controller for a step motor A controller for a step motor which permits the actual step number of the step motor to properly follow up the target step number may be varied with time. The controller temporarily determines a duration shorter than an actually derived duration, and chec... | 02/14/1995 |
| 4678978 | Quieting circuits for permanent magnet synchronous motors Quieting circuits for synchronous electric motors bypass their phase shifting coils with a minor percentage of the total motor watts input.... | 07/07/1987 |
| 4598289 | Control device for a synchro receiver A control device suitable for synchros comprising three stator windings. The device comprises four circuit branches with the inputs of the first and the second branches interconnected to receive a first voltage from the ends of the stator windings of the ... | 07/01/1986 |
| 4445076 | Control system for synchronous motor employed as servomotor A control system for a synchronous motor which is employed as a servomotor, wherein a pulse coder is employed for detection of the absolute position of one of the field poles of the motor, the absolute position being a component of the input signals for g... | 04/24/1984 |
| 4327363 | System for transmitting heading information from a compass to several followers A synchro transmitter having a rotor driven by a compass communicates the heading information from that compass to a plurality of loads via respective synchro receivers whose rotors are energized with direct current or carry permanent magnets and whose st... | 04/27/1982 |
