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| Number | Title | Issue Date |
| 8188701 | Power regenerative converter There are provided a smoothing capacitor (71) for storing an induced electromotive force generated by a three-phase induction motor (5), a regenerative transistor (81 to 86) for switching a terminal voltage of the smoothing capacitor to c... | 05/29/2012 |
| 7521889 | Method of braking induction motor and control apparatus In a DC braking method for stopping an induction motor, torque shock generated by an abrupt change of an output current phase is reduced to a predetermined value or less when a switch-over from a normal control state to a DC braking state. When a switch-over from a ... | 04/21/2009 |
| 7408312 | Control device for permanent magnet synchronous motor A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 fo... | 08/05/2008 |
| 7368889 | Motor control apparatus and control method thereof A motor control apparatus supplying AC power to a motor having a plurality of motor windings having an inverting part including a bridge circuit having a plurality of switching units, and supplying the AC power to the motor; brake relays short circuiting the motor w... | 05/06/2008 |
| 7326881 | Floor heating system A floor heating system including a sub-floor, a plurality of fasteners, a first heater conductor assembly and a second heater conductor assembly. The first conductor assembly including a first resistive conductor having a first length, first and second ends, and two... | 02/05/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7248008 | Shaded-pole A.C. motor with dynamic brake Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem swit... | 07/24/2007 |
| 7235948 | Forklift and method for controlling induction motor applied to the same A forklift having a cargo apparatus, the responsiveness of which to the operation by a user is improved. The forklift has: a DSP which generates a frequency instruction f* in response to the operation to a cargo apparatus operation lever, a voltage instruction V* fr... | 06/26/2007 |
| 7227330 | Overvoltage suppression technique for variable frequency drives operating reciprocating loads A motor control for a reciprocating load includes overvoltage suppression. The motor control comprises a variable frequency drive (VFD) operatively connected to a power source for operating a motor to drive the reciprocating load. A sensor determines motor torque. A... | 06/05/2007 |
| 7218068 | Power source for re-circulation pump and method of controlling the same A variable-voltage variable-frequency power source for an electric motor that drives a re-circulation pump for a boiling water nuclear reactor. The power source has a semiconductor electric power converter and a speed controller for controlling the semiconductor ele... | 05/15/2007 |
| 7190146 | Control system and method for an overhead bridge crane Included herein is a system and method for controlling a velocity vector of an overhead crane. A motor is attached to the crane and is positioned to move the overhead crane and has an output vector including a rotational direction and a rotational speed. A variable ... | 03/13/2007 |
| 7180534 | Scanning assemblies, printing devices, and related methods Scanning assemblies, printing devices, and related methods are described. In one embodiment, pole pieces are configured to be coupled with an input voltage source that can produce phase-shifted input voltages, the pole pieces defining at least first and second phase... | 02/20/2007 |
| 7170245 | Motor power supply control apparatus A motor power supply including a DC supply part having a pair of supply terminals; an inverter having a pair of connection terminals respectively connected to the supply terminals thereof to receive DC power therefrom and to supply AC power to a motor, a breaking re... | 01/30/2007 |
| 7164642 | Optical disk reproducing apparatus and method for controlling spindle motor In a process of braking an spindle motor, a frequency of a read clock signal synchronized with an RF signal output from an RF amplifier is measured as a first frequency by a braking control circuit. A brake is then applied to the spindle motor for a predetermined ti... | 01/16/2007 |
| 7148652 | Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors A controller for a variable frequency drive monitors electrical power from a variable frequency drive motor while a brake is maintaining a load driven or moved by the motor without requiring additional feedback components of a closed loop configuration. If excess el... | 12/12/2006 |
| 7135833 | Motor control for flux-reduced braking A method and apparatus for braking an AC motor in the higher portion of its speed range includes substantially reducing flux before applying reverse torque commands to brake the motor. A DC link bus regulator is employed to prevent increases in bus voltage and frequ... | 11/14/2006 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 7126313 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 10/24/2006 |
| 7122986 | Motor operator system for a power switch A motor and a rotary potentiometer, or other position sensor, running on the motor shaft are mounted in a first enclosure with an output shaft for driving a power switch open or closed. A part of the system outside the first enclosure makes use of a motor position s... | 10/17/2006 |
| 7034477 | Domestic electrical appliance including an electric motor Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage sour... | 04/25/2006 |
| 6906493 | Electronic brake for motor In an electronic system, motor braking is accomplished by applying direct current (DC) voltage, developed across a capacitive element during a run mode operation, across terminals of an alternating current (AC) or an induction motor. While the motor is ON, i.e. duri... | 06/14/2005 |
| 6737822 | Traction motor drive system A power system for an electric motor drive such as may be used in an electrically propelled vehicle incorporates the combination of a high power density battery and a high energy density battery to provide an optimal combination of high energy and high power, i.e., ... | 05/18/2004 |
| 6707268 | Alternative drive power arrangement having an electric motor with multiple armatures A system for providing driving torque to wheels on a vehicle includes an electric motor having the capability of independently driving rotatable axle shafts. One example includes a single stator with a first armature associated with a first axle shaft and a second a... | 03/16/2004 |
| 6636693 | DC motor matrix converter with field and armature circuits A regenerative converter for a DC motor (55) having an armature (A, B) and a field (57), comprises a conventional three-phase matrix converter (6) including a three-phase bridge (7), the output of two phases being connected (52, 53) across the armature of... | 10/21/2003 |
| 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 |
| 6417644 | Apparatus and method to generate braking torque in an AC drive A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the n... | 07/09/2002 |
| 6388894 | Pre-wiring device for contactors A pre-wiring device creating a logic function such as an inverter function or a star-delta start function between at least two multi-pole contactors located side by side and used particularly in electrical control equipment of motors. A same pre-wiring de... | 05/14/2002 |
| 6262555 | Apparatus and method to generate braking torque in an AC drive A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the n... | 07/17/2001 |
| 6204627 | Motor control apparatus A transformer outputs different (high or low) secondary voltages. A switch outputs high or low secondary voltage according to a mode signal. An electric power converter including a rectifying circuit and a switching circuit either charges a smoothing capa... | 03/20/2001 |
| 6184604 | Brake mechanism and powered actuator A brake mechanism includes a reduction gear train, a motor structure, and a braking means. The reduction gear train transmits at least a rotation force in a first rotational direction supplied from a drive source. The reduction gear train is imparted with... | 02/06/2001 |
| 6177772 | Method and apparatus for braking a polyphase DC motor A circuit and method for braking a disk drive when a power fault occurs has a circuit (10) for producing an output signal (28) indicating that the motor of the disk drive has slowed at least to a predetermined rotational speed after the occurrence of the ... | 01/23/2001 |
| 6166512 | Controller for diesel electric locomotive In controller for diesel electric locomotive, after output from an alternating current generator driven by a diesel engine is rectified into direct current power, the direct current power is inverted into alternating current power by an inverter to thereb... | 12/26/2000 |
| 6157153 | Motor driver A motor driver has a braking control circuit. The braking control circuit shuts off the supply of an electric current to the coils included in the motor when a motor control signal shifts to a predetermined level and, after a predetermined length of time ... | 12/05/2000 |
| 6118234 | Method and apparatus for effecting dynamic braking of a direct current motor A double pole, double throw switching arrangement for effecting dynamic rotor braking of user controlled operation of a reversible direct current servo motor. Two columns of stationary center and oppositely disposed side contacts are disposed in spaced pa... | 09/12/2000 |
| 6094024 | Dynamic braking system for a motorized lifting mechanism A dynamic braking system for a motorized lifting mechanism such as a crane, hoist or the like allows the load to be lowered at a controlled rate during a power failure. An auxiliary power source is activated to apply an excitation current to the stator wi... | 07/25/2000 |
| 6037729 | Apparatus and method for braking electric motors A braking circuit for braking an electric motor having an armature and run and brake windings, which includes a switching circuit disposed between a source of electrical power and the run winding, this circuit being operable to disconnect the run winding ... | 03/14/2000 |
| 6011378 | Traveling control apparatus for electric vehicles A control apparatus by which a duty ratio in consideration of how energy stored in storage cells is consumed is set to ensure a steady traveling feeling, a regeneration brake which can produce stable braking forces regardless of how storage cells are cons... | 01/04/2000 |
| 5894211 | Electric machine An electric machine includes a rotor and a stator, a rotor position transducer being provided to detect the position of the rotor relative to the stator. Phase windings are sequentially energizable to drive the rotor. The rotor position transducer is powe... | 04/13/1999 |
| 5892341 | Quick set electric motor brake control A control circuit (10) is provided for an electric motor brake (12) having an electromagnetic brake coil (14) energizable to actuate the brake to a released condition permitting rotation of an electric motor (16), and de-energizable to enable actuation of... | 04/06/1999 |
| 5818185 | Process and device for monitoring and controlling the speed of rotation of an electric drive with frequency converter for hoisting gears A process and a device for monitoring and/or controlling the speed of rotation of an electric drive having an asynchronous motor equipped with a braking device (11) and connected via a frequency adapter (13) to an alternating current system (12), e.g. thr... | 10/06/1998 |
