Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7202616 | Synchronous control method and device of the same A synchronous control device which is provided with drive motors and a central control unit generating a synchronous reference signal and with which the drive motor is controlled to rotate synchronously with the synchronous reference signal supplied from the central... | 04/10/2007 |
| 7145302 | Method and apparatus for driving a brushless direct current motor A method for driving a DC motor includes generating a first voltage pulse, based on a pre-determined speed input and duty cycle, and configured to generate motor current of reference current value sufficient to achieve a desired speed according to the speed input. S... | 12/05/2006 |
| 6823233 | Numerical controlling unit A numerical controlling unit that accelerates or decelerates a feeder-driving system includes; an acceleration setting part that can set a volume and a timing of an acceleration that should be supplied to the feeder-driving system, based on a predetermined target co... | 11/23/2004 |
| 6683436 | Self-starting motor control device and method for engine A control device for driving a self-starting motor for an engine is provided with a control means 4. If a starting switch 7 is switched ON when a start enabling signal of a start limiting means 5 and a non-start signal of a start detecting means 6 are in ... | 01/27/2004 |
| 6580244 | Active damping and backlash control for servo systems Two motors are used to provide motion control in a transport drive system. A primary motor, or a primary and secondary motor, provides primary power for accelerated motion. PWM signals are used to drive the motors according to predetermined fixed function... | 06/17/2003 |
| 6512342 | Brushless motor driving device A brushless motor driving device is so configured to control excitation of each phase armature coil an the basis of starting patterns supplied from a start circuit in a starting operation and a rotator position signal obtained from an induced voltage gene... | 01/28/2003 |
| 6509703 | Method and system for reduced voltage start-up of AC motors in multi-motor system A method and system that provides for simultaneous or independent start-up of two or more three-phase AC motors with reduced starting current. Two AC motors have their stator windings connected in series across the power network. If more than two AC motor... | 01/21/2003 |
| 6157159 | Stage system and exposure apparatus using the same A stage system includes a stage movable along a path, a first driving mechanism for accelerating or decelerating the stage on the basis of a resilience force of a resilient member, a first holding mechanism for holding a resilience force being accumulated... | 12/05/2000 |
| 6040666 | Machine tool control system and machine tool control method, and detection system and detection method therefor A machine tool has a spindle with a tooling body mounted thereon, a detector for detecting an acceleration time for the tooling body to reach from a rotation start to a predetermined rpm, a controller for controlling an rpm of the spindle under a lowered ... | 03/21/2000 |
| 5757147 | Method and apparatus for controlling multiple motor drive of printing machine A method and apparatus for controlling a multiple motor drive arranged to drive printing cylinders of a printing machine sychronously decelerates each of the drives upon a failure or defect occurring in one or more of the components of the drive system su... | 05/26/1998 |
| 4146824 | Low speed servo control A control system is described for use in a web transport in which a web is advanced from a supply spool to a take-up spool by a pair of drive motors, the latter of which are actuated by a servo control. The system includes a variable gain network which en... | 03/27/1979 |
