Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7106013 | Motor drive apparatus driving 3-phase brushless motor without using hall sensor A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which voltage is higher/lower, a zero ampere current detection circuit detecting,... | 09/12/2006 |
| 7095141 | Travelling field synchronous AC motor The invention relates to a synchronous AC electric motor with concentrated windings (2), whereby one primary side pole is comprised of a series of toothed-modules (4) with each toothed-module (4) being connected in the correct electrical phase s... | 08/22/2006 |
| 7075265 | High phase order electrical rotating machine with distributed windings A rotating induction machine, containing five or more different phases, having windings distributed according to a sinc function with a cutoff frequency allowing low-order spatial harmonics but preventing higher order spatial harmonics from flowing. In a preferred e... | 07/11/2006 |
| 6998726 | Method and system for providing single-phase excitation techniques to a start exciter in a starter/generator system A system and method is provided for starting a prime mover coupled to a synchronous starter/generator. The system includes an exciter converter that provides a non-fundamental only signal to a field winding of an exciter of the synchronous generator. The non-fundame... | 02/14/2006 |
| 6987375 | Dual-stage drive for switched reluctance electric machines A dual stage drive for a switched reluctance motor (SRM) is disclosed, the SRM having a plurality of phase coils associated therewith. In an exemplary embodiment, the dual stage drive includes at least one of the plurality of phase coils coupled to a first power bus... | 01/17/2006 |
| 6946768 | Pole winding pattern having parallel wound paths The winding (W1) comprises at least two poles and at least one phase, with which the poles are wound. The phase comprises at least two parallel-wired winding branches (1WA, 1WB, 1WC, 1WD). At least two of the winding branches (1... | 09/20/2005 |
| 6940251 | Decoupling of cross coupling for floating reference frame controllers for sensorless control of synchronous machines A synchronous motor controller and method of controlling a synchronous motor without using rotor position sensors are provided. In a floating synchronous reference frame controller, phase currents are measured and a current Park vector is determined. The error betwe... | 09/06/2005 |
| 5313149 | Current supply control apparatus for inductance load The present invention relates to a current supply control apparatus capable of actuating a large inductance load at a low electric power source voltage and also capable of improving a responsibility in a current supply control of the inductance load. When... | 05/17/1994 |
| 5189357 | Method and apparatus for improving performance of AC machines A method and apparatus for improving the performance of polyphase AC machines. The polyphase AC machines are excited both with a fundamental frequency and with an odd harmonic of the fundamental frequency. The fundamental flux wave and the harmonic flux w... | 02/23/1993 |
| 4736147 | Method of starting motors by harmonics and electrical motors started by this method The present invention provides a method for starting motors by harmonics for synchronous motors, wound-rotor and cage-rotor asynchronous motors started thereby. During the starting period, according to the present invention, the connection of the stator w... | 04/05/1988 |
| 4634950 | Electric apparatus An electric machine which is adapted to function as a motor or generator without any major electrical or mechanical modifications and conforms to conventional electric machine manufacturing practices. This machine has associated therewith, microprocessor ... | 01/06/1987 |
| 4476424 | Variable speed induction motor drive system A variable speed induction motor drive system operating at a leading power factor. A prescribed reactive power is coupled to the motor's rotor, to permit line commutation of an inverter supplying the motor's stator, and to permit the inverter to be suppli... | 10/09/1984 |
| 4459530 | Electric rotating apparatus An electric rotating machine which is adapted to function as a motor or a generator without any major electrical or mechanical modifications. This machine has associated therewith, microprocessor controls. There is provided two balanced phase synchronous ... | 07/10/1984 |
| 4459502 | Self-cascaded reluctance motor with axially laminated rotor A self-cascaded reluctance motor is provided with an axially laminated rotor. The motor includes a stator winding having two sets of terminals and wound such that the number of poles between one set of terminals differs from the number of poles between th... | 07/10/1984 |
| 4445081 | Leading power factor induction motor device A variable-speed, leading power factor AC machine which may be supplied through a line-commutated inverter.... | 04/24/1984 |
| 4058755 | Kramer system utilizing a commutatorless motor A speed control system for an induction motor controlled by a converting arrangement coupled with a commutatorless motor which operates without commutation failure notwithstanding wide variations in the speed of the commutatorless motor. The speed control... | 11/15/1977 |
