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| Number | Title | Issue Date |
| 7291994 | System and method for establishing spindle motor current during cold temperature operation of HDD When a HDD is operating at a temperature below a threshold, a partial sine wave is input to the spindle motor to activate the motor to reduce undesirable speed oscillations of the motor. At normal operating temperatures a full sine wave is input for noise reduction.... | 11/06/2007 |
| 7271561 | Fan module and control device thereof Fan module and control device thereof. The fan module comprises a plurality of fans and the control device. The control device comprises a temperature sensing circuit, and a driving circuit. The temperature sensing circuit detects an ambient temperature of the fans ... | 09/18/2007 |
| 7272303 | Method and control circuit for driving an electric motor of a seatbelt retractor An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are provided each of which has a trigger input and a control signal outp... | 09/18/2007 |
| 7248007 | Control system to monitor the functioning of an electromechanical drive in a vehicle A control system for an electromechanical drive in a vehicle has a motor (29) whose connections (24, 25) are connected to the assigned control elements (2, 3) of a bridge circuit, a control circuit (21) with signal connections (12, 13 | 07/24/2007 |
| 7244106 | Process and device for flow control of an electrical motor fan A method and configuration from maintaining a constant of air to a protective helmet (4) from a fan (3) in a battery powered fresh air unit. The fan (3) is a radial fan with a filter (5) positioned on the suction side of the fan and is op... | 07/17/2007 |
| 7233092 | Permanent magnet synchronous motor The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg | 06/19/2007 |
| 7212365 | Servo writer Disclosed is a servo writer when, detecting an abnormality from servo signals written on a tape-shaped recording medium, such as a magnetic tape, corrects the abnormality through a simplified procedure, thereby allowing for an increase in the transport speed of medi... | 05/01/2007 |
| 7145742 | Velocity controlled disk drive head retraction after power loss A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor after a sudden power loss. The control apparatus includes a measuring circuit for measuring a back electromotive force (back EMF) from the electric motor d... | 12/05/2006 |
| 7133603 | Motor driving apparatus, digital camera, and motor controlling method A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a moto... | 11/07/2006 |
| 7126294 | Method and device for controlling photovoltaic inverter, and feed water device A photovoltaic inverter control method includes steps of monitoring a variation in output voltage of a solar battery by a power and voltage monitoring circuit (51) and, when the variation occurs, accelerating or decelerating an electric motor (3) to ma... | 10/24/2006 |
| 7110634 | Optic switching mechanism Techniques for switching an optical element from one path to another, where each path has high dimensional stability in a harsh thermal and dynamic environment, are disclosed. In one particular embodiment, the optic is mounted on a rotable platform. A spring mechani... | 09/19/2006 |
| 7086819 | Single lever with button for selectively controlling either tilt or lift of a forklift mechanism In a load handling apparatus for a counterbalance type forklift, a single tiltable operating lever is disposed on a body of the forklift, a mast which is tiltable in an anteroposterior direction is disposed on the forklift, a liftable fork is disposed on the mast, a... | 08/08/2006 |
| 7046917 | Speed controlling device of a motorized cart for a person to ride on A device of a cart includes a control, a speed regulating potentiometer, a microprocessor, a digital-to-analogue converter, a motor controlling unit, and a switch; the control is angularly displaceable and near to handlebars of the cart; the potentiometer is connect... | 05/16/2006 |
| 7036435 | Drive device of the bull-wheel of a single carrying-hauling rope chair lift with fixed rope grips A bull-wheel of a fixed carrying-hauling rope chair lift is driven by a geared motor mechanism having a coaxial shaft line extending perpendicularly to the bull-wheel in a substantially vertical direction. The geared motor mechanism is composed of an electric motor ... | 05/02/2006 |
| 7026780 | Method for stabilizing the movement of an articulated chain of a chain block, especially to prevent the formation of a resonance oscillation of the chain, and a chain block apparatus The invention concerns a method for stabilizing the motion of an articulated chain of a chain block, especially to prevent the formation of resonance oscillation of the chain, in which an articulated chain is led across a polygonal chain wheel with non-uniform pitch... | 04/11/2006 |
| 6960894 | Cordless, powered surgical tool A powered tool for performing surgical procedures. The tool includes a handpiece in which a power generating unit is housed. A control member is mounted to the handpiece. The control member is mounted to the handpiece so that the orientation of the control member ca... | 11/01/2005 |
| 6934468 | Brushless DC motor and circuit for controlling the same Disclosed is a multiphase brushless DC motor of a concentrated winding type having shunt connection, and a control circuit. The brushless DC motor includes a rotor made up of a permanent magnet with M number of poles, and a stator operating in K number of phases by ... | 08/23/2005 |
| 6873124 | Rotational speed controller for electrically powered tools A rotational speed controller maintains a constant low speed during idling, a constant high speed when a load is applied and controls motor rotational speed in the range between low and high speed to ensure safe operation when used in an electrically powered tool. W... | 03/29/2005 |
| 6508636 | Freon compressor A freon compressor comprises a compressor device and an electromotor device. The electromotor device is used for driving the compressor device and consists of a stator and a rotor rotating within the stator. The stator further consists of a stator core an... | 01/21/2003 |
| 6385395 | Fan motor with its speed controlled by operating periods of a pulse wave A fan motor whose speed is controlled by an operating period of pulse waves includes first and second rectifying circuits, a voltage comparison circuit, and a differential amplifier. A pulse wave is inputted into the first rectifying circuit, an actual sp... | 05/07/2002 |
| 5859511 | Motor with input-controlled high side driver A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5672948 | Digital, Back EMF, single coil sampling, sensorless commutator system for a D.C. motor A digital, back EMF, single coil, sensorless up/down counter frequency adjustment system for a d.c. motor includes means for detecting the occurrence of a null voltage during the back EMF commutation state of a field coil; counter means for counting in on... | 09/30/1997 |
| 5377296 | Mine winder or hoist drum electric motor control for preventing excitation of oscillation The invention provides a control system for an electric motor arranged to drive a rope drum of a mine winder or a hoist system which includes a conveyance supported by a rope and which forms an oscillating system. The control system includes load sensor w... | 12/27/1994 |
| 5005207 | Method of controlling the speed of a D.C. motor and device for carrying out the method A device for controlling the speed of a d.c. motor (M) employs a method in which the motor supply voltage (V) is controlled by a control voltage (Vo) supplied by a comparator circuit (11) which compares a reference signal (Sref) with a signal (... | 04/02/1991 |
| 4905300 | Motor control and power systems and methods of operation thereof A pulsating D.C. voltage is developed by a rectifier 86 and is filtered by a capacitor 100 to facilitate application of a relatively smooth, enhanced D.C. voltage to a motor 106. The charged voltage of capacitor 100 is applied across a series circuit whic... | 02/27/1990 |
| 4764711 | Back emf loop closure The back emf voltage of a motor is extracted from the applied motor voltage and motor current by means of a control system including a back emf sensor, an adaptive motor resistance circuit, and a position integrator. In the back emf sensor a corrected mot... | 08/16/1988 |
| 4721893 | Process and apparatus for controlling the electric motor drive of a unit for the manufacture of moldings from multi-component plastics To control the intermittent movement of a conveyor belt or carousel, fitted with molds, in a unit for the manufacture of moldings from multi-component plastics, an intended/actual value comparison of the speed of the conveyor belt or carousel as a functio... | 01/26/1988 |
| 4707646 | Method of limiting motor power output The power output of a variable speed motor is limited to a safe level by determining the maximum allowable speed corresponding to a maximum power output limit over a range of load conditions and then maintaining the speed of the motor below those maximum ... | 11/17/1987 |
| 4686439 | Multiple speed pump electronic control system An electronic control system for a multiple speed fluid pump and motor. A parameter of the motor, the pump, or the fluid which is expelled from the pump is measured by a sensor. When a predetermined value of the parameter is reached, the sensor provides a... | 08/11/1987 |
| 4677357 | Furnace draft control with remote control feature An apparatus for controlling the speed of a combustion blower motor includes first means for generating an output signal representative of a differential pressure. A second means provides a second signal representative of a desired airflow output of the b... | 06/30/1987 |
| 4675586 | Monitoring circuit for a door operating D.C. electric motor A monitoring circuit for a door operating D.C. electric motor, the circuit comprises a first means for detecting a back EMF of the motor and producing a load signal indicative of the magnitude of the back EMF, a second means for detecting the time rate of... | 06/23/1987 |
| 4659976 | Method and apparatus for maximizing utilization of an electric motor under load The present invention relates to an electronic device that is used to calculate the actual torque being produced by an electric motor at any instant in time and comparing this value of torque ratiometrically either with the maximum (peak) torque that the ... | 04/21/1987 |
| 4649327 | Electric motor control circuit The motor control circuit is constituted by a current controlling circuit having a first output terminal connected to a source terminal via a resistor, a second output terminal connected to the source terminal through a motor to be controlled, the current... | 03/10/1987 |
| 4644238 | Airflow control apparatus An apparatus for controlling an airflow to a boiler or the like and maintaining a desired quantity thereof. The apparatus comprises a controller for generating a control signal of a level corresponding to a required airflow, a variable-frequency power sup... | 02/17/1987 |
| 4639650 | Control system for a cooling fan in an impact printer A control system for an impact printer having a cooling fan, in which a current for driving a printing device is detected as a voltage and the detected voltage is compared with a reference value. When the detected voltage is lower than the reference value... | 01/27/1987 |
| 4629954 | Closed loop control method for hydraulic apparatus A non-linear function f(A) of an effective value D' with respect to a desired value A regarding speed, pressure or the like of an actuator of a hydraulic apparatus in a closed loop control for the hydraulic apparatus is operated and a value regarding quan... | 12/16/1986 |
| 4620140 | Control device for variable speed electric motor A control device for a variable speed electric motor determines a quantity of light received from a short-circuit current of a solar battery, and also determines a cell temperature of the solar battery from an open circuit voltage, thereby producing a cur... | 10/28/1986 |
| 4567410 | Capacitive article density monitor A capacitance article density monitor which is adjusted to have a zero voltage output when no articles are positioned adjacent a sensor and wherein the output of the circuit may be utilized directly to control a variable speed drive for a machine to which... | 01/28/1986 |
| 4506199 | Agricultural fan control system Agricultural fan control system for controlling operation of fan in an agricultural installation including a thermostat temperature control, a manual constant speed adjustment temperature control, and an automatic variable fan speed with a minimum tempera... | 03/19/1985 |
| 4484116 | Prime mover and method of operating an electrical switch A prime mover adapted for selective energization across a power source. The prime mover has a winding circuit, a rotatable assembly, and an electrical switch including a housing, a first pair of switch means adapted for connection in circuit relation with... | 11/20/1984 |
