Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7952316 | Variable frequency reduced speed variation electric drive A multiple-winding induction machine may be used to obtain a reduced-speed-variation electric drive when using a variable-frequency power distribution system. Each winding may have a different number of poles. The winding with the smallest number of poles may operat... | 05/31/2011 |
| 7382103 | Magnetic gearing of permanent magnet brushless motors A permanent magnet brushless 3-phase motor comprises windings R, Y, B, each divided into a plurality of sections 1-5 and switch means S1-S12 for selectively connecting the section of the respective winding e.g. R in series and/or parallel... | 06/03/2008 |
| 7348703 | Monopole field electric motor-generator with switchable coil configuration A pair of stators produce a magnetic field within a space between them a ferromagnetic toroidal rotor is rotationally mounted within the magnetic field. A plurality of windings are wound radially on the rotor and each winding provides a plurality of coils. Each of c... | 03/25/2008 |
| 7263840 | Automatic LN2 distribution system for high-purity germanium multi-detector facilities A cryogenic fluid distribution device may include a fluid flow passage for distributing cryogenic fluid to an apparatus, an overflow passage positioned downstream of the apparatus, and a sensor coupled to the overflow passage, the sensor having an active component f... | 09/04/2007 |
| 7235891 | Power system having generator driven by engine An apparatus for controlling the operation of power conditioners (10) for supplying the generated power to an external power system such as a commercial power system, in which power conditioners (10) are interconnected to an external power system, the ... | 06/26/2007 |
| 7224079 | Driving/electric-power generating system for vehicle An AC generator comprises a rotor and a stator having a three-phase winding. A three-phase inverter is connected to the three-phase winding. Here, the three-phase winding comprises at least two independent three-phase windings. Switching elements for respective phas... | 05/29/2007 |
| 7218075 | Electronic circuit for starting a single phase induction motor An electronic circuit for starting a single phase induction motor, of the type containing a rotor and a stator with at least one running coil (B1) and one starting coil (B2), for operating jointly with an alternating current source (F), comprising: a t... | 05/15/2007 |
| 7213520 | Diesel electric locomotive A diesel electric locomotive includes a main generator for a drive apparatus and an auxiliary generator for auxiliary appliances, connected to a diesel engine. The main generator is connected by a first rectifier to the direct current traction intermediate circuit o... | 05/08/2007 |
| 7196490 | Variable speed motor A variable speed motor includes first and second main windings wound on a stator, and a relay for performing a switching operation between serial/parallel connections of the first and second main windings to control motor speed. The variable speed motor further incl... | 03/27/2007 |
| 7091691 | Variable speed motor An outer-rotor variable-speed motor, to which single-phase AC power is applied and on which a rotor is provided outside a stator, comprises first and second main windings provided on a stator of the motor to form a plurality of poles, a frequency detector for detect... | 08/15/2006 |
| 7078826 | Hybrid gas turbine engine starter-generator A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a conventionally wound main stator that is selectively configurable as a multi-pole AC stator and a mul... | 07/18/2006 |
| 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 |
| 7075255 | Variable speed controller for a family of multi-tap motors A system for variable speed motor control provides continuous variable speed motor controller for each motor or motor application within a family of multi-tap motors while using a single controller. The single controller utilizes a wave chop technique providing vari... | 07/11/2006 |
| 7026785 | Motor controller A system and method for controlling an electric motor is disclosed. The method comprises determining the operating load of the electric motor and then calculating the voltage to be applied to the electric motor in response to the operating load. The voltage to be ap... | 04/11/2006 |
| 6979979 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 12/27/2005 |
| 6979968 | Method and system for managing processor execution time utilizing variable frequency switching The present invention includes a method for managing processor execution time in a motor controller. The method includes receiving motor speed data, comparing the received motor speed data to predetermined motor speed ranges, determining a motor speed range based on... | 12/27/2005 |
| 6946815 | Switch for a variable-speed induction motor A switch for a variable-speed induction motor includes conductive connecting pieces, a rotary member, and a driving unit. The connecting pieces are mounted in a housing, are adapted to be connected to the induction motor, and have distal contact parts that surround ... | 09/20/2005 |
| 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 |
| 6940202 | Electrical machine having a stator winding with a plurality of filars A stator for an electric machine includes a generally cylindrically-shaped stator core having a plurality of circumferentially spaced core slots. A stator winding includes a plurality of phases, each including a plurality of filars, each filar extending circumferent... | 09/06/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 6900614 | Rotation speed search apparatus for increasing an output voltage of an inverter and method thereof A rotation speed search apparatus for an induction motor includes: a voltage control unit for comparing a rated current of a motor and a current detected from the motor and generating an output voltage; and a frequency control unit for comparing a reference excitati... | 05/31/2005 |
| 6891294 | Electric motor vehicle comprising same An electric motor for a motor vehicle or other machine. The motor includes a support member with electromagnets (coils) and a moving member with permanent magnets. The coils are divided into groups, each group having several sets of coils, each set having several co... | 05/10/2005 |
| 6841967 | Coil winding number variable type motor and coil winding number varying method for varying cooling and heating capacity of reciprocating compressor A coil winding number variable type motor for varying a cooling and heating capacity of a reciprocating motor includes: a plurality of coils separately wound and connected in series to each other so as to vary turn ratio among motor coils; a plurality of relays resp... | 01/11/2005 |
| 6815926 | Single phase induction motor with partially shared windings A single phase, three-speed induction motor having 4, 6, and 8-pole speed configurations. In one embodiment, the motor is constructed and arranged to be used in connection with a washing machine. The 8-pole speed winding shares a portion of the 4-pole speed winding,... | 11/09/2004 |
| 6633151 | Electric vehicle drive system An electric drive system is provided to generate varying amounts of output torque supplied to a driven member over a wide range of constant revolutions per minute speeds to reduce power consumption. The electric motor includes a rotor and a stator assembl... | 10/14/2003 |
| 6456033 | Pole change induction motor The present invention provides a pole change induction motor that can obtain an arbitrary ratio between the numbers of poles and that can select an arbitrary number of turns to thereby obtain a very wide operating range and stabilize an operation when the... | 09/24/2002 |
| 6304053 | Automatic firing change when motor leads swap on delta motor soft starter Problems associated with delta motors and motor controllers being subjected to swapped lead conditions as well as with time consuming troubleshooting are eliminated in a motor controller that automatically changes firing circuit timing for proper operatio... | 10/16/2001 |
| 6255797 | AC motor with reactor interposed between AC motor and power source A reactor (32) and a switch (35) are interposed in parallel between U-phase, V-phase and W-phase on a power source side (31) and U, V and W terminals on a motor side (33). A changeover switch )37) is interposed between Z, X and Y terminals on the motor si... | 07/03/2001 |
| 6169383 | Self adapting motor controller Problems associated with maintaining a large inventory of multiple types of motor controllers designed to accommodate a single motor type are eliminated in a motor controller that automatically senses if it connected to a delta motor or a wye motor and co... | 01/02/2001 |
| 6135720 | Air compressors of sliding vane eccentric rotor type An air compressor includes a stator, which includes an inlet and an outlet and defines a substantially cylindrical bore, and a rotor eccentrically rotatably mounted in the bore. The rotor is connected to be rotated by a three-phase asynchronous electric m... | 10/24/2000 |
| 6121746 | Speed reduction switch A speed reduction switch for a multiple speed induction motor includes a speed selector switch and a delay element. As the motor is switched from a high speed to a lower speed, the delay element temporarily prevents electrical connection of a motor auxili... | 09/19/2000 |
| 6066935 | Pole-changing asynchronous fan motor with continuously adjustable speed The invention relates to a fan installation with at least one pole-changing asynchronous motor (6, 7) for the driving of a fan (8, 9), a regulating device (14, 15) being provided by which the speed of rotation of the asynchronous motor (6, 7) is continuou... | 05/23/2000 |
| 6049149 | Brushless DC motor having opposed pairs of axial magnetic field type permanent magnets and control system therefor A brushless DC motor includes opposed pairs of axial magnetic field type permanent-magnets. Two opposed stators are axially arranged at two opposite sides of a rotor, each and stator includes a plurality of equiangularly spaced electromagnetic zones and i... | 04/11/2000 |
| 6008616 | Pole change induction motor and control apparatus and method for the same An apparatus for a pole change induction motor and control method for the same which are applicable to, for example, a driving source of an electric vehicle without power transmission are disclosed. In the control apparatus and method for the pole change ... | 12/28/1999 |
| 5880571 | Method of and system for controlling a variable speed induction motor A method of and system for controlling an induction motor detects input frequency to the motor and connects windings of the motor in one of a plurality of configurations in dependence upon the detected frequency.... | 03/09/1999 |
| 5818195 | Dual state controller for brushless electric motors A controller is provided for use with electric motors which will achieve a two mode motor operation. In this operation, a first mode is utilized having a torque configuration thus more efficiently providing high torque outputs from the motor. However, a s... | 10/06/1998 |
| 5650707 | Inverter-controlled induction machine with an extended speed range A four pole induction machine with an extended speed range includes a stator with six independent stator coil groups (a pair of said coil groups constitutes a stator phase winding) and two current regulated inverters. Each of the inverters supplies curren... | 07/22/1997 |
| 5614799 | Brushless direct current motor having adjustable motor characteristics A brushless direct current motor includes a permanent magnet mounted to a rotor and a set of commutated stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configurati... | 03/25/1997 |
| 5436546 | Method and apparatus for switching back a change-pole motor To enable a gentle switching back of a change-pole motor to a low speed while ensuring the full moment or torque on passing into motor operation, a method for switching back the change-pole motor to the lower speed is proposed wherein initially there is a... | 07/25/1995 |
| 5070291 | Connection switching apparatus for three-phase induction motor Low rotational speed characteristics of a three-phase induction motor driven by a PWM inverter are improved by rapid Ɗ-Y connection switching by semiconductor switches (1, 2, 3, 4, 5), for example, TRIAC's.... | 12/03/1991 |
