Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7291997 | Servo system A motor has built therein a brake for stopping the rotation of the motor and a brake controlling circuit for controlling the brake. The motor is further provided with a bypass circuit for supplying an electric power directly to the brake and a terminal for connectin... | 11/06/2007 |
| 7180255 | Controlling the release of a brush motor which has applied a load A method for controlling the release of a brush motor which has applied a load includes several steps. One step includes applying a release current to the brush motor to rotate the brush motor in a direction toward releasing the applied load of the brush motor. Anot... | 02/20/2007 |
| 7005816 | Electromagnetic suspension system for vehicle An electromagnetic suspension system for a vehicle, comprises an electromagnetic actuator interposed between a sprung mass and an unsprung mass and disposed substantially in parallel with an spring element. An electric motor is provided for driving the electromagnet... | 02/28/2006 |
| 6992453 | Actuator control system An actuator control system restrains hindrance to an object under control by an interfering substance that exists on its traveling path when the object is moved toward a target position on one axis while the object has been positioned at a target position on the oth... | 01/31/2006 |
| 6900609 | Method and control structure for damping low-frequency load oscillations in drives with a motor and load According to the invention, the controller cascades are suitably divided up and the oscillation damped only in the load rotational-speed controller. Here, a motor rotational-speed setpoint value (z) of a quickly regulated motor rotational-speed controller (9)... | 05/31/2005 |
| 6801010 | Vibration suppression positioning controller To provide a vibration-damping positioning controller capable of effecting stable positioning operation within a short period of time. The vibration-damping positioning controller has an integrator 6 for integrating a differential value of the target p... | 10/05/2004 |
| 6441573 | Blended electrical/friction braking system with electric brake feedback monitor and method of use thereof A blended electrical/friction braking system includes an electric brake feedback monitor which monitors a first signal corresponding to an electric brake effort request of an electric motor of an electrically powered vehicle. The electric brake feedback m... | 08/27/2002 |
| 6084374 | Controller and filter used therein The controller comprises (a) an interpolation calculator for dividing move data of a robot arm tip position into each sample period, the data fed from a position teaching section, (b) a load inertia calculator, (c) a gravity torque calculator, (d) acceler... | 07/04/2000 |
| 5777814 | Apparatus for preventing picture fluctuation and correcting pulse in video cassette recorder An apparatus for preventing a picture fluctuation and correcting a reverse pulse in a servo system for a video cassette recorder having a still or slow motion playback function. The apparatus comprises speed and phase error detectors for detecting speed a... | 07/07/1998 |
| 4914366 | Positioning control system A plurality of speed-sliding compensation amount functions are stored in a sliding compensation amount data memory and one of these functions is selected in response to input of a selection signal. In the selected function, sliding compensation amount dat... | 04/03/1990 |
| 4570113 | Rotary member control A method and apparatus for controlling the position of a rotary member, particularly a rotary knife, utilizes a motor that is continuously coupled to the rotary member. A shaft position sensor and velocity sensor cooperate with motor control and drive cir... | 02/11/1986 |
| 4417312 | Electronic controller for valve actuators An electronic controller is provided to control the energization of an electrical actuator to readjust a valve which controls the flow of a fluid in a controllable process. The controller is responsive to two signals, one of which is produced by a process... | 11/22/1983 |
| 4345193 | Driver for postage meters A driver for positioning the postage amount handles of a postage meter, the driver including motors which, in response to control signals from a postage computer, axially displace shafts along paths generally parallel to the paths of the postage meter han... | 08/17/1982 |
| 4329633 | Motion damping apparatus Apparatus is disclosed for controlling the movement of a movable element to bring the movable element to rest at a desired stopping position. The apparatus comprises a multiphase drive motor having a drive shaft coupled to the movable element for driving ... | 05/11/1982 |
| 4328450 | Closed loop velocity control system for a movable element Apparatus is disclosed for controlling the movement of a movable element between an initial starting position and a final stopping position. The apparatus comprises drive means coupled to the movable element and responsive to motor drive signals for movin... | 05/04/1982 |
| 4316131 | Control apparatus of flying shears In a control apparatus of a flying shear wherein a clutch is actuated to transmit the rotation of a drive motor to a cutting blade to rotate the same for achieving cutting and then the clutch is disengaged and the cutting blade is stopped by means of a br... | 02/16/1982 |
| 4246525 | Motor control system A system for accurately stopping a motor operated positioning device permits satisfactory motor tolerance limits for economical production by incorporation of a processor controlled motor plugging routine. The plugging routine includes an initial reverse ... | 01/20/1981 |
| 4216422 | Solid state motor control circuit providing a dynamic braking function A solid state motor control circuit for controlling the operation of a servo motor comprises a comparator circuit including a differential amplifier having its inputs connected across terminals of the motor and having its output connected to a drive circu... | 08/05/1980 |
| 4201935 | Method and apparatus for controlling the feed of machine tools An improved feed for a D.C. motor driven feed including a feed screw and nut which moves the table of a machine tool through predetermined positions in accordance with orders to change the rate of feed. The improved feed includes a power damping circuit, ... | 05/06/1980 |
| 4193022 | Analog/digital numerical control system An analog/digital numerical control system that utilizes analog techniques to process large scale (macro) differences and digital techniques to process small scale (micro) differences. In this manner, advantage is taken of the respective virtues of both a... | 03/11/1980 |
| 4130787 | Reliability monitoring system A system for monitoring a machine tool under automatic control is provided which uses the actual path of the tool in all directions of motion for comparison with a mathematically ideal path to detect tool error. Machine tool position is obtained from inde... | 12/19/1978 |
| 4088938 | Electronic apparatus for positioning and using AC motors A solid-state valve actuator control system using three-phase AC motors as prime movers having a summing point with a set point input, a position feedback input and a velocity feedback input. Velocity feedback being produced by differentiating position fe... | 05/09/1978 |
| 4023080 | Phase synchronizing circuit A circuit for synchronizing a motor at the receiving end of a communication link with one at the transmitting end thereof, the circuit preventing an indication of synchronization until the receiving end motor reaches its rated speed.... | 05/10/1977 |
| 3995208 | Control circuit A control system for a d.c. motor, in which a cyclical d.c. drive signal is applied to the motor power input terminals as the system approaches balance. In each cycle, during at least part of the time interval between drive signal application to the motor... | 11/30/1976 |
| 3940676 | Damping control for positioning apparatus A positioning apparatus includes a platen and a head independently movable relative to the platen. First and second coils having a particular phase relationship are disposed relative to each other on the head are independently energized to produce first a... | 02/24/1976 |
