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.
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| Number | Title | Issue Date |
| 8102141 | Inverter device An inverter device driving an induction motor including main and auxiliary windings both having different winding specifications includes a three-arm inverter circuit having phase output terminals connected to the main winding, the auxiliary winding and a neutral wi... | 01/24/2012 |
| 7863853 | Electric motor control device An excitation current processor of a current controller processes the excitation current corresponding to the magnetic flux instruction from the magnetic flux instruction processor. It multiplies this excitation current with a boost coefficient to obtain an excitati... | 01/04/2011 |
| 7071657 | Method and apparatus for the production of power frequency alternating current directly from the output of a single-pole type generator A single-pole type generator with low loss magnetic core is excited by a field coil that is part of a low loss series resonant circuit tuned to a desired AC power frequency, which may be frequencies such as 50 Hz or 60 Hz or 400 Hz. The series resonant circuit is ex... | 07/04/2006 |
| 6693406 | Method of controlling a motor and a power supply apparatus The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current Iout, the voltage Uout and the frequency fout to an input of said motor, where the number of r... | 02/17/2004 |
| 6208113 | System for controlling the rotation of AC motors The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit suc... | 03/27/2001 |
| 6081083 | Switched reluctance motor In a switched reluctance motor and control system for such a motor, a rotor comprises four salient poles each having a width of about 50-degrees, and a stator has six salient poles each having a width of about 30-degrees. One Excitation winding is mounted... | 06/27/2000 |
| 6040679 | Variable capacity compressor having two-step motor strength adjustability An electrical control system for a variable capacity compressor having an A/C motor is provided. The control system includes a first circuit that has a start winding in series with a capacitor, a second circuit that has a main winding. The control system ... | 03/21/2000 |
| 4277735 | Control apparatus for induction motor An induction motor has a multi-phase primary winding (stator winding) and a multi-phase secondary winding (rotor winding) which are connected to each other in opposite phase relation. The both windings are fed with variable frequency A.C. current from a c... | 07/07/1981 |
| 4161680 | AC rotary machine apparatus An AC rotary machine apparatus comprises an AC rotary machine having AC windings forming five or seven phases and an AC feeder having solid state switches feeding AC power to the AC windings in five or seven phases.... | 07/17/1979 |
| 4132931 | Control system for a.c. motors A control system for an a.c. motor having a polyphase primary winding (stator winding) and a corresponding polyphase secondary winding. The primary and the secondary windings are supplied with current from different frequency converters provided separatel... | 01/02/1979 |
| 4093898 | Control system for regulating the speed of an electric motor A control system for regulating the torque and speed of an alternating current induction motor used in the traverse drive of an overhead travelling crane comprises an SCR bank controlled by a firing circuit responsive to actuation of an operator-controlle... | 06/06/1978 |
| 4030018 | Power converter system A power converter system for converting an AC voltage into a DC voltage, comprising a transformer means provided with a primary winding connected to an AC power source and a secondary winding divided into a plurality of sets of coils; and rectifier means ... | 06/14/1977 |
