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| Number | Title | Issue Date |
| 7133603 | Motor driving apparatus, digital camera, and motor controlling method A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a moto... | 11/07/2006 |
| 7071656 | Torque computation unit for vehicle generator A torque computation unit of a vehicle generator includes a rotor, an armature winding, a field coil and a field current switching element. The torque computation unit includes a field current detecting circuit, an output current detecting circuit and a rotation spe... | 07/04/2006 |
| 6721496 | Electrical resonance circuits for high efficiency direct current motors Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “lin... | 04/13/2004 |
| 6408130 | Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities The invention relates to an electric drive device with a DC motor (2) comprising a control circuit with an electronic commutator (3). The invention is characterized in that a derivation of a control signal (V_i_ref) is obtained from an induced motor volta... | 06/18/2002 |
| 5867002 | Electromechanical device with variable resistance circuit for controlling a load, particularly of an electric motor The invention concerns an electromechanical device with variable resistance circuit serving to control a load. The device comprises a connection (10) for a source of power (12), a connection (14) apt to be connected to a load (16) supplied by the source o... | 02/02/1999 |
| 5347895 | Brake lathe with electronic feed control A brake lathe for truing brake rotors includes a tool holder driven by a direct current motor to move a cutting tool radially with respect to the rotor axis in direct proportion to the number of turns of the drive shaft of the direct current motor. A tool... | 09/20/1994 |
| 5075604 | Variable resistance switch A variable resistance switch includes first and second flexible contact arms engageable by a pair of cam followers operable sequentially by an actuator movable in a first and an opposite direction. The actuator also carries a wiper movable therewith over ... | 12/24/1991 |
| 4426605 | Method of operating a shunt-wound DC motor as well as controlling device for the execution and application thereof So as to permit operating a shunt-wound motor with the series characteristic without the use of electronic armature current adjusters, it is proposed to start the motor (1) with the connection of start-up resistances (R1 -R4) and to ... | 01/17/1984 |
| 4135121 | Variable-speed drive system with hydrostatic transmission and electric shunt motor A drive system for a utility vehicle, such as a fork-lift truck, comprises a hydrostatic transmission whose pump is driven by an electric shunt-wound motor having a field winding so energized, under the control of a potentiometer responsive to the fluid p... | 01/16/1979 |
| 4131832 | Speed sensitive field weakening control for traction motors Disclosed herein is a control for a direct current motor including a field weakening solenoid switch including a solenoid coil, which control includes a switch connected in series with a coil for connecting and disconnecting the coil to a source of direct... | 12/26/1978 |
| 3950683 | Motor control system having dead band control A motor control system is disclosed for use in controlling a DC motor. This system employes a high gain DC amplifier for providing command signals to a motor control circuit which, in turn, controls energization of the motor to vary the motor speed depend... | 04/13/1976 |
