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| Number | Title | Issue Date |
| 7372226 | Method for switching off a power tool In a method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) is shut off as a function of a variable threshold value (E1) if the tool jams. The threshold value (E1) is determined in at l... | 05/13/2008 |
| 7372224 | System and method for determining barrier motor parameters without using sensors A barrier operator comprises a first measuring apparatus for measuring a current used by a direct current (dc) motor to move a barrier and a second measuring apparatus for measuring a generated voltage of the dc motor. A controller is coupled to the first measuring ... | 05/13/2008 |
| 6906487 | Anti-pinch window drive circuit An antipinch circuit prevents the motor driven closure of an automotive window if a soft obstacle is compressed between the window and the top of the door frame, and the window is opened in response to the sensing of the obstacle. The circuit measures the motor torq... | 06/14/2005 |
| 6515441 | Glass edge object detection sensor An object detection system includes a sensor in communication with a controller which identifies contact with the sensor. In a preferred embodiment the sensor is a piezo film which generates a signal when an object applies a predetermined force to the edg... | 02/04/2003 |
| 6225769 | Device for operating an electric motor A device for operating an electric motor (10) is proposed, which evaluates overloading or blocking of the drive (11) from a characteristic of a current (40, 41) flowing through the electric motor (10). In accordance with a first embodiment, the determinat... | 05/01/2001 |
| 5854546 | Suppression of radio frequency emissions For the suppression of radio frequency emissions from an electrical drive comprising an electric motor supplied with electrical power via an electronic controller having a high speed switching device which generates high frequency energy, an electrical sc... | 12/29/1998 |
| 5774625 | Arrangement for monitoring the rotational speed of a rotary-anode drive motor of x-ray The invention relates to an X-ray apparatus, comprising a rotary-anode X-ray tube, a device for monitoring the rotational speed of a rotary-anode drive motor of the X-ray tube, a sensor circuit for determining an angle signal which is dependent on the pha... | 06/30/1998 |
| 5712551 | Starting circuit protection apparatus and method for brushless DC motor compressor A brushless DC motor compressor starting circuit protecting apparatus for a refrigerator and a method thereof, for controlling excessive current flowing through a coil of a brushless DC motor which is caused by a pressure load of the refrigerator when a c... | 01/27/1998 |
| 5016133 | Apparatus for flicker protection when a servo-motor starts An apparatus for flicker protection when a servo motor driven sewing machine starts utilizing comparators. Setting the original voltage as the reference voltage and the dropped voltage as the monitor voltage, the comparator compares the voltages and, if t... | 05/14/1991 |
| 4675586 | Monitoring circuit for a door operating D.C. electric motor A monitoring circuit for a door operating D.C. electric motor, the circuit comprises a first means for detecting a back EMF of the motor and producing a load signal indicative of the magnitude of the back EMF, a second means for detecting the time rate of... | 06/23/1987 |
| 4468597 | Method for regulating the power supply to a direct-current motor and a device for the application of said method The power supply to an electric actuating motor is regulated by reducing the differences between current intensity or voltage and a reference value. Two transducers measure the current intensity and the voltage. A selection stage chooses the higher of the... | 08/28/1984 |
| 4305028 | System for evaluating the capability of a work-performing robot to reproduce a programmed series of motions A system for evaluating whether a work-performing robot can perform a series of programmed motions is disclosed which includes means for continuously comparing the velocity of the various links of a robot simulator, which is manually moved through the seq... | 12/08/1981 |
| 4274040 | Solenoid torquer system A solenoid torquer system with flux rate feed-back. The system includes a torquer coil and an associated core, and a device adapted to drive a current through the coil having an amplitude proportional to the difference between a coil current command signa... | 06/16/1981 |
| 4249117 | Anti-kickback power tool control An impending kickback condition in the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The ... | 02/03/1981 |
