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| Number | Title | Issue Date |
| 7221117 | Method and system for controlling an electric motor in the event of flux reduction The present invention relates to a method and a system for correcting references (xref), in the case of flux reduction, used in a speed variator for controlling an electric motor M having a three-phase supply, for example of the synchronous or asynchronou... | 05/22/2007 |
| 6919705 | Drive system A drive system, includes a motor having a neutral terminal, a converter, which has a voltage intermediate circuit and is electrically connected to the motor, a switching device, and a holding brake, which is mechanically connected to the motor. The holding brake has... | 07/19/2005 |
| 5909017 | Elevator energy conservation system An elevator energy conservation system is disclosed comprising an elevator motor driven by generator having two power supplies. A primary power supply provides electricity to the generator when the elevator motor is in use, while a smaller power supply us... | 06/01/1999 |
| 4743814 | Static power conversion for adding DC motors A method and apparatus of adding a DC drive motor to an existing Ward-Leonard motor-generator motion drive for a material handling device which utilizes static power conversion to supply the armature current of the added DC drive motor. Existing drive mot... | 05/10/1988 |
| 4707644 | Auxiliary starting for electric motors A fluid-powered auxiliary starting system for electric motors is disclosed which includes an accumulator means for supplying an amount of fluid at high pressure to a fluid-operated motor and a clutch of similar device for connecting the output shaft of th... | 11/17/1987 |
| 4186332 | Limited rotation moving iron motor with novel velocity sensing and feedback A device for providing a voltage indicating the angular velocity of rotation of the armature in a limited rotation, polarized, moving iron galvanometer. The device includes a means for providing a first voltage dependent upon the angular velocity of the a... | 01/29/1980 |
| 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 |
