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| Number | Title | Issue Date |
| 7414375 | Fan voltage regulation control device A fan voltage regulation control device includes a voltage regulation control unit for providing the power to a heat-dispersing fan, wherein the voltage regulation control unit is connected to a temperature detecting element and a voltage detecting unit. The tempera... | 08/19/2008 |
| 7385795 | Cordless power tool with a protected weak link element A method consistent with an embodiment may include selecting one of a plurality of components of a power supply system of a cordless power tool to be a protected weak link element. The method may also include configuring the protected weak link element to fail from ... | 06/10/2008 |
| 7362066 | Overload protection system An overload protection system and method of protecting a drive unit includes a torque arm assembly mounted to a fixture and a gear reducer. The reducer includes a bracket mounted to an axle of the reducer which is positioned adjacent to a measuring device. The torqu... | 04/22/2008 |
| 7312593 | Thermal regulation of AC drive An apparatus for the thermal regulation of an AC drive for providing power to a motor includes a temperature sensor producing a signal indicative of temperature, a heater resistor connectable across a DC link of the AC drive, and a first switch. A controller is oper... | 12/25/2007 |
| 7268508 | Direct current motor control circuit and wiper system using said circuit The invention relates to a direct current motor control circuit. The invention also relates to the use thereof in a windscreen wiper system for vehicles. An MOS FET transistor with an anti-parallel diode (M3) is serially mounted on the braking system (M2 | 09/11/2007 |
| 7239103 | Synchronous motor startup lock detection circuit and method A startup failure detection system provides an indication of motor startup failure based on a flux amplitude signal value. The flux amplitude signal is derived from motor flux estimations in combination with a rotor angle estimation. The flux amplitude signal value ... | 07/03/2007 |
| 7227325 | Method and arrangement for protecting a frequency converter A method and an arrangement for protecting a frequency converter in a system comprising a motor and a frequency converter supplying it via a bipolar or multipolar supply connection, the arrangement comprising first connecting means adapted to couple poles of the sup... | 06/05/2007 |
| 7208909 | Motor protection inhibit circuit A circuit for inhibiting a protection device of a motor includes first, second, and third comparators and an inhibit signal generator. The first comparator is operable to determine if a motor current signal associated with the motor exceeds a starting threshold to i... | 04/24/2007 |
| 7193382 | Apparatus for detecting over current of motor in vehicle An apparatus for over current detection of a motor for use in a vehicle. This invention prevents the motor from burning out by more precisely detecting an over current of the motor within an overall drive area of the motor. This can be accomplished by setting, as an... | 03/20/2007 |
| 7187149 | Commutation technique for an AC-to-AC converter based on state machine control A system for controlling a commutation of a load current is provided. The system comprises a AC-to-AC converter that includes a plurality of switching elements, an energy source that provides an oscillating voltage and is connected to the converter, an electrical lo... | 03/06/2007 |
| 7148638 | Method and apparatus for embedding motor error parameter data in a drive motor of a power driven wheelchair A drive motor assembly for a power driven wheelchair comprises: a stator housing for containing field coils of a stator of the motor assembly; at least one sensor disposed in the stator housing for sensing rotation of the motor; a memory storing motor error paramete... | 12/12/2006 |
| 7084588 | Method, apparatus and article for motor control voltage dropout detection A control subsystem for an electric motor determines whether power was interrupted, and delays torque production if power was interrupted. The control subsystem may employ two separate non-volatile memory locations, or alternatively a single non-volatile memory loca... | 08/01/2006 |
| 7042181 | Method and system for controlling motor torque A method and system for controlling motor torque provides improved responsiveness and reliability in motor control applications. The motor control system includes a power converter, a voltage detector for detecting the converter input voltage and a control circuit f... | 05/09/2006 |
| 7023164 | Robot and over-current protection device for a robot It is so arranged in a robot as to monitor the over-current state of each motor and that of two more than two motors when put together by seeing the total current value of the motors being monitored in parallel with absorption of both the static load torque and the ... | 04/04/2006 |
| 7015666 | Device for sensing an obstacle in the opening range of a closure element of a motor vehicle A device for sensing an obstacle in said opening range of an automotive closure element movable between an open position and and closed position, more particularly an electrically powered door window (20) or sunroof is provided with a weatherseal (30) ... | 03/21/2006 |
| 7002313 | Electric power steering device control apparatus An object of the present invention is to provide a controller for an electric power steering apparatus which has a function capable of detecting abnormality of motor current detection circuits even while a steering operation is being executed and can execute alterna... | 02/21/2006 |
| 6989642 | Method and apparatus for embedding motor error parameter data in a drive motor of a power driven wheelchair A drive motor assembly for a power driven wheelchair comprises: a stator housing for containing field coils of a stator of the motor assembly; at least one sensor disposed in the stator housing for sensing rotation of the motor; a memory storing motor error paramete... | 01/24/2006 |
| 6972536 | Closure member control device and method for limiting positional deviation of closure member A control unit stores a count value, which is used to detect an operational position of a roof glass, in a RAM. The control unit determines whether the count value is properly stored in the RAM when a voltage of a power supply falls below a predetermined voltage and... | 12/06/2005 |
| 6965206 | Method and system for fail-safe motor operation An electric device includes a motor and a motor drive for commanding a torque generated by the motor. A fault control circuit detects a fault condition associated with the motor drive. Upon detection of the fault condition, the fault control circuit adjusts the torq... | 11/15/2005 |
| 6960895 | Coupled RFI choke as stall detection means for brush type DC motor A brush type DC motor 10 having an armature 15 and positive and negative power leads is provided. The motor includes an RFI choke 12 as a transformer in series with at least one of the positive and negative power leads to amplify current such th... | 11/01/2005 |
| 6930457 | DC motor brush filter circuit The present invention provides a motor control circuit including a motor with a motor winding and a brush, a battery, a relay, and a ground return circuit. The battery is for energizing the motor. The relay selectively provides connection between the battery and the... | 08/16/2005 |
| 6891347 | Cooling fan control based on cabinet intrusion Various systems and methods are provided for cooling a cabinet. In one embodiment, a method is provided that comprises the steps of controlling a speed of the at least one cooling fan in response to a temperature of the cabinet, and, controlling the speed of the at ... | 05/10/2005 |
| 6888327 | System for protecting a power semiconductor output stage that switches an inductive load A system for protecting a power semiconductor output stage that, as a function of a control signal, connects an inductive load to a direct-current supply voltage and disconnects it therefrom. Protection from the induced voltages is achieved, without a freewheeling d... | 05/03/2005 |
| 6882122 | Electronically switchable motor with overload protection Electronically commutable motor whose output stages are controllable by an electronic control unit, using PWM control signals, and are feedable from a supply voltage source. A limitation to a maximum load with overload protection is achieved, at least upon exceeding... | 04/19/2005 |
| 6874326 | Air conditioning system with two compressors and method for operating the same Disclosed are an air conditioning system with two compressors and a method for operating the same, so as to variably change a compression capacity of a refrigerant according to the variation of cooling load. Herein, when a full operation order is inputted to the two... | 04/05/2005 |
| 6876164 | Complementary fan rotational speed control method and apparatus A complementary fan rotational speed control method and apparatus for simultaneously monitoring the rotation speeds of two or more fans includes a control unit to output pulse width modulation (PWM) control power supply to activate operation of a first fan and a sec... | 04/05/2005 |
| 6870347 | Permanent magnet synchronous motor driving system, and method of testing permanent magnet synchronous motor driving system A permanent magnet synchronous motor driving system includes: 1) a permanent magnet synchronous motor, and 2) an inverter. The permanent magnet synchronous motor includes three phase terminals. A resonant frequency is generated between an inductance and a ground ele... | 03/22/2005 |
| 6864653 | Equipment fan An improved fan useful for ventilating applications in motor vehicles features a modular structure, which facilitates quick replacement of any components likely to fail. A first module (110) is intended for permanent installation on the part that is to be coo... | 03/08/2005 |
| 6825625 | Device with an electromotor An arrangement having an electric motor (10) has a microcontroller (12) for influencing at least one motor function and a nonvolatile storage element (14) for storing at least one variable as a definition for that motor function. The arrangement... | 11/30/2004 |
| 6815923 | Stepper motor jam detection circuit Methods, devices and circuits for detecting malfunctions in stepper motors. A signal from a driver circuit to a stepper motor that is proportional to the current in the windings of the stepper motor is detected. This signal is then amplified and integrated for ease ... | 11/09/2004 |
| 6806669 | Motor overload coil control A motor overload coil control is disclosed for use in a motor starter/relay contactor. The control includes an 8-bit, 8-pin microcontroller that together with an I/O reduction circuit, is capable of functioning 13 I/O's with only 5 I/O pins on the microcontroller. T... | 10/19/2004 |
| 6801009 | Current limitation process of brush and brushless DC motors during severe voltage changes A closed-loop control system for a DC motor includes a DC motor 12, a current sensor 14 for determining a current of the motor, a voltage sensor 32 for measuring a voltage of the motor 12, and a micro-controller 33. The micro-contr... | 10/05/2004 |
| 6794843 | Ventilator having a muting device A ventilator having a muting device includes a central processing unit, and a fan motor. The fan motor is connected to a start capacitor which is electrically connected to a temperature sensing circuit which is electrically connected to the central processing unit, ... | 09/21/2004 |
| 6788014 | Drive control system for a multiphase motor powered by a power converter A drive control system for a multiphase motor powered by a power converter of a type including a multi-pulsed bridge circuit with a plurality of controllable converter valves and a same number of electrically isolating devices, includes a control unit, with the inpu... | 09/07/2004 |
| RE38486 | Electric motor control circuit An electric motor control circuit that prevents lowering of a motor's rotation speed when a load is applied in the case where a rotation speed is adjusted within a range that doesn't exceed a predetermined upper limit of rotation speed. When a base current of a tran... | 04/06/2004 |
| 6654262 | Inverter with pre-charging capacitor to reduce inrush current A power conversion device that limits an inrush current while reducing overall weight and volume of the device even under a high rated power. One and the other ends of an initial charging circuit having a DC power source, a switch, and a diode connected i... | 11/25/2003 |
| 6653804 | Method and apparatus for controlling a bucket hoist using a flux vector AC drive A dual hoist bucket crane controller for operating a closing motor and a holding motor using a close inverter adapted to control the closing motor and a hold inverter adapted to control the holding motor where the hold inverter and the close inverter are ... | 11/25/2003 |
| 6621243 | Drive unit for a movable part of a vehicle The invention relates to a drive unit for a closure of an open roof construction. It comprises an electric motor having a drive shaft and transmission means and an electric circuit including said motor and control means to actuate the motor. An emergency ... | 09/16/2003 |
| 6577086 | Device for disconnecting a neutral point of a motor A circuit for disconnecting a neutral point of an electric machine includes an inductance connected to a lead of the electric machine; a three-terminal solid-state switch that has a first terminal connected to the inductance, a second terminal connected t... | 06/10/2003 |
| 6563281 | Device for controlling the operation of driving apparatus A device for monitoring operation of a driving arrangement including at least a servo-mechanism, which includes a regulator, a driving motor controlled by the regulator, and an element which can be set in motion by the driving motor. A detection arrangeme... | 05/13/2003 |
