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| Number | Title | Issue Date |
| 6998804 | Electric motor with electronic brake A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as seri... | 02/14/2006 |
| 6922037 | Rotating induction apparatus An electrical rotating apparatus comprises an inverter system that outputs more than three phases. The apparatus further includes a stator electrically coupled to the inverter system, and a rotor electromagnetically coupled to a magnetic field generated by the stato... | 07/26/2005 |
| 6545439 | Method and circuit arrangement for detecting motion, direction and position of a part driven by an electric motor An electric motor for driving a component, such as a vehicle window lifter or a machine tool, functions as a generator, when the motor drive voltage is switched off and the motor is short circuited. The motor keeps running due to inertia or other influenc... | 04/08/2003 |
| 6384556 | Motor driving circuit In order to brake a brushless motor in a forward rotation to give a reverse rotation force, source-side and sink-side transistors for supplying driving circuits *a, *b, *c, *d, *e, *f are periodically switched on and switched off based on the oscillation ... | 05/07/2002 |
| 6377006 | Method and apparatus for preventing the unauthorized opening of an electronic lock The present invention is an electronic lock having a shorting or shunt circuit designed to allow an authorized operator to open the electronic lock and which will prevent an unauthorized operator from opening the lock when authorized combination has not b... | 04/23/2002 |
| 5917295 | Motor drive system having a plurality of series connected H-bridges A motor drive system for selectively supplying a drive current to a multiple phase motor having each phase winding divided into a plurality of discrete windings includes a plurality of H-bridge drives to control the polarity and magnitude of the drive cur... | 06/29/1999 |
| 5828194 | Control circuit for control of a direct-current motor normally excited in series including structure for separate excitation during braking A control circuit provides, for connecting a motor to a d.c. voltage source (1), two half bridge (3, 7, 5, 9) each with a respective switch (3, 5) with controlled opening and closing; the first of the half bridge connects a pole of the excitation winding ... | 10/27/1998 |
| 5818180 | Voice coil motor feedback control circuit A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop prevents the BEMF from driving a voltage on the voice coi... | 10/06/1998 |
| 5751125 | Artificial heart with sensorless motor An artificial heart assembly, designed for implantation into a subject, which may be a total artificial heart or a ventricular assist device. The artificial heart assembly has a blood inlet conduit, a blood outlet conduit, a pumping mechanism for pumping ... | 05/12/1998 |
| 5189354 | Angular position selecting apparatus A permanent magnet rotor is connected to an output shaft and has more than one pair of magnetic poles. A stator has three phases connected in Y-connection including a first phase, a second phase, and a third phase. Each phase has as many series-connected ... | 02/23/1993 |
| 4980622 | Actuator two-fault tolerance apparatus Control apparatus having two-fault tolerance for two position, motor operated actuators includes electronic circuitry for disconnection of the power return to the actuator motor armature thereby insuring that the motor will not be activated upon an inadve... | 12/25/1990 |
| 4357567 | Reversible motor A reversible linear motor has a coil arrangement arranged alongside a conductive body such as a rotatable aluminium disc. The coil arrangement is made up of three separate coils: namely an inner coil and two interconnected outer coils on opposite sides of... | 11/02/1982 |
| 4306180 | Directional control system A circuit for controlling the drive direction of an electrically-driven vehicle, the circuit having a plurality of spring return input switches (20) each actuation of which changes the direction of the vehicle, via a flip-flop circuit (21), an amplifier (... | 12/15/1981 |
| 4225811 | Direct current motor with polyphase stator winding and electronic commutating device controlled by an angular position transmitter In a D.C. motor in which signals generated by an angular position transmitter control the commutation of the current flowing through the stator winding via a selection circuit containing Exclusive OR gates by means of which the polarity of the signals gen... | 09/30/1980 |
| 4158795 | Brushless DC motors A brushless DC motor capable of change of rotational direction is disclosed. The feed of a high-frequency voltage signal to switching elements is sequentially changed to orderly excite stator windings by the outputs from rotor angular position detectors s... | 06/19/1979 |
| 4139153 | Electronic reversible motor operated valve assembly An electronic reversible motor operated valve assembly adapted to be controlled by a two-wire thermostat. The assembly includes a valve casing having a pivotally mounted valve member, and a reversible motor drive unit having forward and reverse motor wind... | 02/13/1979 |
| 3946292 | Brushless motor driving system A driving system for reversibly rotating a D.C. brushless motor is disclosed. The system comprises Hall generators for detecting positions of a rotor, and a drive circuit for controlling conduction and interruption of current applied to stator windings ma... | 03/23/1976 |
