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| Number | Title | Issue Date |
| 7477028 | Actuator control system A system for maintaining appropriate control of an actuator in the event of a power disruption without being adversely affected by the period of the power disruption. The actuator may close during the power disruption but will be fully opened upon the return of powe... | 01/13/2009 |
| 7301295 | Stabilizer control device A stabilizer control device includes a stabilizer having torsion bars and a brushless motor having an exciting coil, a rotating direction switching device switching a rotating direction of the brushless motor, an excitation control device for controlling power suppl... | 11/27/2007 |
| 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 |
| 7234536 | Power screwdriver A power screwdriver is disclosed having a drive which is coupled via a clutch, disengaging as a function of torque, to a tool drive shaft for driving a tool. The screwdriver comprises an electronic control unit for controlling the drive, and a sensor which is couple... | 06/26/2007 |
| 7215093 | Motor drive circuit and motor drive method that can positively perform a brake operation A motor drive circuit includes a first transistor. The collector of a second transistor is connected to the emitter of the first transistor in series. A motor is connected to a connection point between the first and second transistors. A first brake control circuit ... | 05/08/2007 |
| 7158329 | Disk drive employing active braking using inductive sense A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. Disk control circuitry executes a spin-down operation of the spindle motor by estimating an a... | 01/02/2007 |
| 7071645 | Braking device for an electric motor, electrical apparatus provided with the braking device, and a method of braking A braking device for an electric motor of a power tool has a short circuit switch for short circuiting an armature winding of the electric motor during a braking process, the short circuit switch for controlling its switch condition having a control input, a control... | 07/04/2006 |
| 7053570 | Control circuit for a dual directional direct current motor employing a single alternating current power source A control circuit operates a dual directional DC motor from an AC power source. A controller has first and second position indication inputs adapted to receive respective first and second position indications. The controller also has first and second direction outpu... | 05/30/2006 |
| 6979976 | Driving apparatus for driving a brushless motor A driving system for driving a brushless motor effects a rotation control of a rotor by sequentially switching application of a current to magnetic coils disposed in a stator in response to a detection signal from a pole-position detector. The driving system compris... | 12/27/2005 |
| 6879123 | Device to control a 3-phase motor A device to control a 3-phase motor having an inverter connected to each phase terminal and a brake to arrest the 3-phase motor, includes a power supply to supply power to the brake and the inverter at the same time based on a predetermined synchronization signal. T... | 04/12/2005 |
| 6741050 | Method of controlling and switching for braking an electronically commutated electrical motor A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using... | 05/25/2004 |
| 6601513 | Motor control method and apparatus, time recorder having same and impact type printing apparatus A motor control method and apparatus for stopping an object moved by a motor accurately at a predefined target position, shortening the time period required in stop control, in which the motor is driven at a first (high) speed up to a distance from the ta... | 08/05/2003 |
| 6538411 | Deceleration control of a personal transporter A system and method for automatically decelerating a personal transporter of the kind that has a controller for controlling the motion of the transporter. Upon detection of a fault condition, a goal value of a control variable is set, the control variable... | 03/25/2003 |
| 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 |
| 6429609 | Drive device, especially for moving and turning the slats of a blind in a runner In a drive device which is especially suitable for moving and turning the slats of a blind in a runner and in which the rotational movement of a drive wheel (2) can be alternately transmitted to a turning drive means effecting the rotational movement of t... | 08/06/2002 |
| 6429614 | Method and device for controlling an electronically commutated polyphase D.C. motor A device and method for driving a polyphase DC motor, in which a phase selector circuit, in each case, selects only one phase, which is fed to a commutation detection circuit. After each commutation detected by a commutation detection circuit, as a result... | 08/06/2002 |
| 6353297 | Series motor A series motor with commutator is disclosed which is especially suited as universal motor for a braked power tool. The series motor comprises a switch for switching between a motor mode and a braking mode, wherein, in motor mode, at least one field windin... | 03/05/2002 |
| 6310452 | Single cycle positioning system utilizing a DC motor A single cycle positioning system utilizing a DC motor wherein a wide ranging incoming AC supply voltage is rectified and a fixed frequency variable duty cycle pulse width modulation is provided to apply a predetermined rms DC voltage to the motor for a s... | 10/30/2001 |
| 6268708 | Control apparatus for electric power steering system In control devices of electric power steering systems, steering characteristics are improved by control being carried out by means of a signal based on rotor speed or steering angle after failure of a torque sensor is detected. In the present invention, i... | 07/31/2001 |
| 6182723 | Switchable router brake system Improvements made to a router a relate to a switchable router brake system. The switchable brake system permits a motor brake to be selectably engaged to operate when the router motor is turned off. When engaged, the motor brake, which comprises a brake r... | 02/06/2001 |
| 6114820 | Power window apparatus having safety unit A power window apparatus is provided for detecting pinching in accordance with the opened/closed position of the window and a state of rotation of a motor, the apparatus having a position sensor which detects a safety-control suspension region of the wind... | 09/05/2000 |
| 5828195 | Method and apparatus for electronic braking of an electric motor having no permanent magnets Apparatus for braking either a linear or rotary electric motor having no permanent magnets comprising at least one position sensor for outputting an electrical characteristic representative of motor position and an electronic circuit for generating a puls... | 10/27/1998 |
| 5691617 | Disc drive transducer deadbeat settle method utilizing interval correction A method for settling a transducer (18) of a hard disc drive (10) on a target track (30) on a rotating disc (12) of the disc drive at the end of a seek to the target track in a determined time period. The time period is divided into two deadbeat intervals... | 11/25/1997 |
| 5041772 | Locomotive dynamic brake control An apparatus for controlling dynamic braking in a vehicle having at least one drive motor of the type having an armature and a field. The motor is adapted to function as an alternator during dynamic braking for dissipating power through a resistor grid. T... | 08/20/1991 |
| 4922161 | Method and apparatus for improving the regulation of the speed of a motor An automatic braking and speed control for a device driven by an electric motor. A controller provides a pulsed output voltage having a pulse width dependent upon the load seen by the motor (16). When the drive pulses are present two diodes (52,54) and a ... | 05/01/1990 |
| 4914362 | Electric circuit with limit switches for limiting rotatable range of electric drive unit An electric circuit with limit-switch for limiting rotatable range of an output shaft of an electric drive unit disposed between an electric motor and a control device for supplying a drive current thereto, comprising a first snap action limit switch disp... | 04/03/1990 |
| 4896084 | Single input, single supply three-state controller A circuit for controlling three modes of operation of a multiple terminal load using a single positive DC voltage 12, simple circuitry, two relays 26, 30 and a single input control line 17. The circuit senses a switch 16, or logic device generating three ... | 01/23/1990 |
| 4546297 | Electric actuators An electric actuator having an output member movable into and out of a force-exerting position, electric motor means operable both to move the output member to and from its force-exerting position and, when the output member is in that position, to contro... | 10/08/1985 |
| 4546295 | Electric actuators The present invention provides an electric actuator having an output member movable from a first variable position to a second variable position; an electric motor operable to control a spring system to exert an output force on the output member when in i... | 10/08/1985 |
| 4546298 | Electric actuators An electric actuator having an electric motor operable to determine the output force generated on an output member by a spring system, and an adjustable stop by which can be limited the maximum value of the output force, the position of the adjustable sto... | 10/08/1985 |
| 4546296 | Electric actuators An electric actuator which comprises an electric motor operable to a varying degree correspondingly to cause a spring to generate on an output member an output force which varies in accordance with the varying degree of operation of the electric motor.... | 10/08/1985 |
| 4489257 | Driving and braking system for electric motors A driving and braking system having solid state switches for use with an electric motor. A first switch in series with a motor armature carries current from a power supply to the motor during the driving operation. A second switch couples a voltage from t... | 12/18/1984 |
| 4453113 | Regenerative brake control for transit vehicle There is disclosed apparatus for controlling the regenerative brake operation of a transit vehicle, in relation to the polarity condition of coupled power lines having an insulator gap, by sensing that the power lines are successively supplying in relatio... | 06/05/1984 |
| 4401927 | Process and device to control the electric braking of a direct current motor A direct current motor includes a chopper in series with the field coil of the motor to regulate the current flowing through the armature of the motor during electrical braking when the motor functions as a generator to produce current. In addition, a shu... | 08/30/1983 |
| 4388569 | System for automatic control of dynamic braking of independent transport facility A system for automatic control of dynamic braking of an independent transport facility comprises an exciting-current regulator of traction motors provided with rotational-speed transducers whose outputs are connected to the input of a traction-motor react... | 06/14/1983 |
| 4362975 | Device for controlling a bidirectional DC motor This device for controlling the operation of a bidirectional DC motor comprises a pair of double-throw control reversing switches and a pair of ON-OFF switches, a solenoid-operated brake associated with the motor shaft, and two pairs of unidirectional ele... | 12/07/1982 |
| 4275341 | Electronic power supply circuit for a series connected DC motor The circuit effects a changeover from the traction configuration to the braking configuration or vice-versa in less than one millisecond. It includes the field winding (3) of the motor (1) disposed between a traction thyristor (12) and a main chopper (13)... | 06/23/1981 |
