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| Number | Title | Issue Date |
| 7400103 | Controller for a multi-phase brushless DC motor Control of rotational speed of a direct current multi-phase brushless motor is provided using an apparatus and method that works at low speed but does not depend upon Hall effect sensors. An apparatus for accelerating rotation of the motor shaft has a power stage ci... | 07/15/2008 |
| 7253582 | Disk drive estimating angular position of spindle motor during spin-up by computing differences in winding current rise times A disk drive is disclosed comprising a spindle motor having a plurality of windings including at least a first winding, a second winding, and a third winding. During a spin-up operation, a voltage is applied to the first winding and a first rise time is measured for... | 08/07/2007 |
| 7233125 | System and method for controlling an induction motor A system controls an induction motor driven by a power inverter circuit. An operational amplifier circuit is operatively connected to the power inverter circuit and operative therewith for sensing DC current and controlling acceleration and deceleration of the induc... | 06/19/2007 |
| 7126307 | Interface circuit for actuating an electrical device and circuit arrangement for actuating an electric motor therewith An interface circuit for actuating an electrical consumer, especially a pole-changing rotary-current induction motor, with a first contact element assigned to a signal line carrying an alternating voltage signal to generate at least two different control signals. A ... | 10/24/2006 |
| 7000268 | Patient transfer and transport bed The present invention is a transfer and transport device and method for moving a patient from a bed to another location within a medical facility. The transport device includes an integral transfer mechanism for transferring a patient from a hospital bed to the devi... | 02/21/2006 |
| 6484633 | Side wall for an ink fountain of a printing machine The side wall (5) for an ink fountain of a printing machine has two plates (11, 14) fixed some distance apart and an intermediate plate (13) having a front edge (13a) in the shape of an arc of a circle. This intermediate plate (3) is mounted between the p... | 11/26/2002 |
| 5875281 | DC solid state series wound motor drive Direct current (DC) solid state series wound motor drives for hoist and crane applications. A microprocessor controlled electronic system is employed to control the speed, direction, acceleration and deceleration of a direct current DC solid state series ... | 02/23/1999 |
| 5804937 | Vehicle door operating apparatus A vehicle door operating apparatus includes a torque sensor or detecting torque applied to a knob of a vehicle door, a velocity sensor for detecting a moving velocity of the vehicle door, and a controller unit. The controller unit modifies a target curren... | 09/08/1998 |
| 5594306 | Electric motor for portable machine tools An electric motor for portable machine tools, comprising an output shaft for operating, means for sensing the speed of said output shaft; means for sensing the magnitude and the phase of the input voltage of the electric motor itself; means for sensing th... | 01/14/1997 |
| 5355061 | Windshield wiper system The present invention is an improved windshield wiper assembly. The assembly includes a wiper blade which undergoes oscillatory rotary motion and is swept back and forth between two extreme locations across a windshield to remove rain and other precipitat... | 10/11/1994 |
| 5012165 | Conveyance with electronic control for left and right motors A conveyance (10) is provided with automatic limiting (223) of the rate of change in power supplied to first (26a or 232a) and second (26b) motors, whether the motors are electrical or hydraulic; and dynamic braking of electric motors (26a and 26b) is ach... | 04/30/1991 |
| 4904909 | Controller for electric clamp A controller for an electric clamp closes the clamp rapidly at first, then runs at a slower speed while contacting the workpiece, and speeds up again after contacting it, to close with full clamping force. Arrival of the clamp at the position for slowing ... | 02/27/1990 |
| 4626750 | Solid state d.c. motor control The system includes a plurality of parallel-connected power field effect transistors arranged for connection in series with the traction motor with a common control circuit connected to the gate electrodes of the field effect transistors to control the on... | 12/02/1986 |
| 3979651 | Direct current and synchronous motor system A motor control system in which direct current is sequentially applied to portions of the motor stator windings in response to rotor position signals generated by Hall effect devices until the rotor has reached a desired angular velocity corresponding to ... | 09/07/1976 |
| 3968414 | Bypass contactor control A system for operating a bypass contactor in a time-ratio DC to DC control vehicle drive system. In order that the contactor be energized, it is necessary that the voltage across the motor exceed some minimum value, and that directional contactors be clos... | 07/06/1976 |
