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| Number | Title | Issue Date |
| 8174227 | Fan control system A fan control system includes a temperature detecting circuit and a rotation rate control circuit. The detecting circuit includes a first amplifier, a second amplifier, and a thermistor. The control circuit includes a first terminal, a second terminal, and a third t... | 05/08/2012 |
| 8084981 | Rechargeable electric power tool In a rechargeable electric power tool, upon changeover of a trigger switch, a microcomputer determines the magnitude relation between the detected temperature outputted from the first thermistor and the first temperature threshold value, the second temperature thres... | 12/27/2011 |
| 8080962 | Motorised barrier roller A fire or smoke barrier 1 has a curtain 2 deployed from a motorized roller 3 mounted in a head box 4. Remote from the head box and connected to the motor via a cable 5 is a motor controller circuit 6. A short circuit... | 12/20/2011 |
| 7394216 | Automatic anti-trap device An automatic anti-trap device is provided to add safety to other apparatuses. The automatic anti-trap device of this invention has a driving circuit to control a motor, a current sensor to generate a current signal, a current ripple peak value circuit to generate a ... | 07/01/2008 |
| 7358468 | Complex home appliance and method of controlling and installing the same A complex home appliance and a method of controlling and installing the same. The complex home appliance includes a single power supply unit shared by two or more component home appliances of the complex home appliance. The two or more component home appliances are ... | 04/15/2008 |
| 7352147 | Power supply to provide operation power for cooling fans A power supply to provide operation power for cooling fans includes a non-stop power system to provide DC power in normal conditions to a remote switch control circuit to set a computer in an ON or OFF condition. The non-stop power system also outputs the DC power t... | 04/01/2008 |
| 7339362 | Alterable DC power supply circuit An alterable DC power supply circuit includes a regulator, a resistor, and an adjustable load resistance. The regulator includes a voltage input pin, a voltage output pin, and an adjusting pin. The resistor is coupled between the voltage output pin and the adjusting... | 03/04/2008 |
| 7331532 | Acoustic noise reduction using fan speed control A method and apparatus is disclosed for acoustic noise reduction using fan speed control. The acoustic noise reduction using fan speed control includes a plurality of temperature detectors disposed at a plurality of locations within an electronics equipment enclosur... | 02/19/2008 |
| 7317296 | Electric motor The electric motor is equipped with an electronic control, for example in the form of a frequency converter (2) and comprises at least one Seebeck element (6) whose one side is connected to the motor (1) in a heat-conducting manner and whose oth... | 01/08/2008 |
| 7307396 | Overload protection system for an electrical device A protection system for an electrical device may include at least one temperature sensitive element located in a region adjacent to a component of the electrical device and configured to provide an output related to an actual temperature in the region. The system ma... | 12/11/2007 |
| 7305316 | Microcontroller methods of improving reliability in DC brushless motors and cooling fans A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An expected fan speed is determined, where the expected fan speed corresponds ... | 12/04/2007 |
| 7295897 | Mapping a plurality of sensors to respective zones in a fan control system A fan control system in which a sensor selection block having a number of sensor inputs may be combined with an autofan block having a number of zone inputs, where the number of sensor inputs is greater than the number of zone inputs. Each one of the sensor inputs o... | 11/13/2007 |
| 7275533 | Pressure controller for a mechanical draft system Systems and method for controlling the flow of air through a mechanical draft system are disclosed herein. A pressure controller for controlling air pressure comprises an appliance controller configured to control the operation of a plurality of appliances, an intak... | 10/02/2007 |
| 7256562 | Control circuit for a cooling fan A control circuit for a cooling fan is provided that adjusts input power and drive a cooling fan. The control circuit comprises a temperature detector for detecting temperature; a power controller for controlling driving power to the cooling fan based on the input p... | 08/14/2007 |
| 7245099 | Electronic apparatus that allows cooling fan to be driven with certainty even at the time of software malfunction/lock-up or at the time of controller failure A voltage for driving a cooling fan is usually output from a fan voltage control circuit. Whether to cause the fan voltage control circuit to output the drive voltage or not is controlled by a system management utility (software) and a bridge controller (hardware) o... | 07/17/2007 |
| 7190139 | Learning method for a motorized screen with orientable slats and device therefor The learning method is one which comprises an action of the installer having at least as consequences the ending of the powering of motor controlling the translational movement of the slats in the direction of extending, if this movement is in progress, and/or the i... | 03/13/2007 |
| 7173226 | Complex home appliance and method of controlling and installing the same A complex home appliance and a method of controlling and installing the same. The complex home appliance includes a single power supply unit shared by two or more component home appliances of the complex home appliance. The two or more component home appliances are ... | 02/06/2007 |
| 7157878 | Transient compensation voltage estimation for feedforward sinusoidal brushless motor control A method for controlling a voltage mode controlled electric machine comprising: receiving a torque value representative of a desired torque; obtaining a speed value indicative of a rotational velocity of the electric machine; acquiring a phase advance value indicati... | 01/02/2007 |
| 7129660 | Motor-temperature estimation apparatus and motor control apparatus A motor-current square value calculation section 45 calculates, as a motor-current square value, the sum of respective square values of two phase currents converted from three phase currents flowing through an electric motor. A temperature estimation calculat... | 10/31/2006 |
| 7084593 | Method and apparatus for thermal management of an electric power assist steering control system by compensating steering motor current An electric power assist steering control system having an electric motor actuator and a motor driver circuit for generating and applying a motor current to the electric motor actuator. A current sensor is included for measuring the motor current from the motor driv... | 08/01/2006 |
| 7075261 | Method and apparatus for controlling a fan A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined amount of current, which may break the inertia of the fan propeller an... | 07/11/2006 |
| 7038408 | Fan motor speed control circuit A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The s... | 05/02/2006 |
| 7036605 | Power tools A detector is disclosed that detects impact sounds, e.g., a hammer striking an anvil or oil pulses from an oil unit. The detector may comprise a receiver that selectively converts sound within a narrow frequency range into electric signals. Preferably, the impact so... | 05/02/2006 |
| 7038415 | Motor driving device A temperature sensor (33) detects the temperature of a MOS transistor (7), and a current detecting circuit (35) detects current flowing in the MOS transistor (7). When the voltage corresponding to the detected temperature or the voltage c... | 05/02/2006 |
| 7029239 | Piecewise linear control of the duty cycle of a pulse width modulated signal A system may include a PWM generator and control logic. The PWM generator is configured to generate a PWM signal having a duty cycle dependent on a duty cycle value generated by the control logic. The control logic is configured to generate the duty cycle value to h... | 04/18/2006 |
| 7019480 | Synchronous-motor controller A synchronous-motor controller including an inverter for converting direct current to alternating current in order to supply a synchronous motor with a current responsive to a torque instruction value, a temperature sensor for measuring a temperature of the inverter... | 03/28/2006 |
| 7012400 | Control circuitry for controlling rotational speed of a DC motor A control circuitry, electrically connected to a DC motor and a variable voltage source for modulating a rotational speed of the DC motor. The control circuitry includes a voltage reference component and a switching circuit. The voltage reference component is electr... | 03/14/2006 |
| 6970643 | Radiator having a fan in variable rotation speed A radiator includes a voltage regulator for providing a reference voltage, a fan including a power end connected to the reference voltage via a first resistor and a feedback end for outputting a pulse signal indicating the rotation speed of the fan, an integration c... | 11/29/2005 |
| 6946809 | Motor driving system A motor driving system includes a power supply unit, a voltage-stabilizing unit, a signal-generating unit, a comparing unit, and a control unit. The power supply unit provides an input supply voltage to each other unit in the system. The voltage-stabilizing unit inc... | 09/20/2005 |
| 6906485 | Spindle motor control using a current profile to taper current transitions Method and apparatus for operating a motor. During a commutation state current is applied to a motor while field effect transistors (FETs) are held in an enable or disable state to effect current in phases of the motor. The phases have a high FET and a low FET. Cont... | 06/14/2005 |
| 6900607 | Combined feedforward and feedback parameter estimation for electric machines A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller responsive to at least one of: a current sensor, and a temperature sensor. Where the controller executes a parameter estimation proce... | 05/31/2005 |
| 6873514 | Integrated solenoid system An integrated solenoid system including a single housing containing a solenoid, a controller and one or more electrical connections. The controller includes temperature compensating means and/or voltage compensating means thereby providing predetermined, substantial... | 03/29/2005 |
| 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 |
| 6847187 | Detection of loss of cooling air to traction motors A thermal protection apparatus for an AC traction motor including a stator, a rotor, a blower fan and an inverter includes a method and apparatus for predicting the motor temperature assuming that the blower is operational. The method and apparatus also determines a... | 01/25/2005 |
| 6810202 | Apparatus for controlling rotational speed of motor An apparatus for controlling a rotational speed of a motor, coupled to a sensing unit capable of outputting a sensing signal. The apparatus includes a controlling unit, coupled to the sensing unit, for outputting a controlling signal according to the sensing signal ... | 10/26/2004 |
| 6737824 | Fan acceleration control A circuit is arranged control the acceleration of a fan by limiting the rate of change in fan speed control signals. The control system includes an acceleration controller that low pass filters a target fan speed control signal. The low pass filtering signal minimiz... | 05/18/2004 |
| 6495982 | Electric motor control A start-up switch 50 for an electric motor 1 comprises a resistive element (54) which is so constituted as to be connectable to an electric current path (15) and which has such a characteristic that its resistance value increases by the heat generated by ... | 12/17/2002 |
| 6453260 | Apparatus and method for collecting motor test data A system for motor thermal protector device performance test data collection includes a microprocessor configured to measure elapsed times of reset and trip power cycles of a motor winding through a thermal protector device. An operator interface terminal... | 09/17/2002 |
| 6407525 | Thermal control variable speed fan motor A thermal control variable speed fan motor comprises a rectifying circuit, a differential amplifier, and a temperature-sensing circuit. The rectifying circuit converts a speed signal detected from the fan into a voltage that is outputted to a negative ter... | 06/18/2002 |
| 6396675 | Computer power supply device having dual adjustment temperature controlled air flow device A high-efficiency, automatic detecting, and self-adjustable temperature controlled air flow device, more particularly a computer power supply having dual adjustment temperature controlled air flow device, includes a primary fan mounted at a front end of a... | 05/28/2002 |
