Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8138702 | Control method and motorstarter device A method for controlling an electric motor with a softstarter. A softstarter device for control of electric motors. Motor torque is controlled in dependence of a torque error signal, based on a calculated difference between the motor torque and a reference torque va... | 03/20/2012 |
| 8125171 | Process for driving an electric machine and driver system therefor A method for operating an electric machine with a driver system is provided, in which an operating variable of the electric machine and/or of the driver system is monitored. The validity of the input variables is checked with regard to their checksum and whether the... | 02/28/2012 |
| 8084975 | Brushless motor, brushless motor control system, and brushless motor control method A brushless motor control system according to the present invention detects a rotor stop position when activating the brushless motor including a stator having coils of three phases U, V, and W, and controls a phase voltage for energizing the coils of the respective... | 12/27/2011 |
| 8040091 | Method and apparatus for stall detection Stall detection apparatus for an electric motor controller has an input for receiving a drive error flag indicating if the controller is unable to achieve the required motor velocity and an input for receiving a signal in order to measure, directly or indirectly, th... | 10/18/2011 |
| 7919943 | Fan system and starting method thereof A fan system includes a connecting device, a controlling device and a fan device. The connecting device includes a first pin receiving at least one driving signal, and a second pin receiving a start signal, wherein a length of the first pin is greater than a length ... | 04/05/2011 |
| 7919944 | Motor driving circuit A motor driving circuit for controlling a current amount flowing through a motor coil includes: a comparator configured to output a comparison signal indicating a comparison result between a set current amount and a current amount based on an inputted set current si... | 04/05/2011 |
| 7821215 | Pump controller system and method Embodiments of the invention provide a method of detecting a fault condition in a motor of a pump. The method includes sensing a first current value and a speed of the motor, attempting a recovery operation if the first current value is greater than a current thresh... | 10/26/2010 |
| 7821214 | Load driving apparatus, vehicle incorporating the same, and control method for load driving apparatus An ECU estimates an output allowable power of a power storage device based on the temperature and SOC of the power storage device. The ECU also calculates a threshold power based on the power required to start an engine. When the ECU determines that the output allow... | 10/26/2010 |
| 7800328 | Fan motor driving circuit A fan motor driving circuit controls an energized state of a fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor of a driving object. A variable reference voltage circuit generates a voltage whose voltage level chan... | 09/21/2010 |
| 7795826 | Brushless motor driving circuit and motor having the same circuit A brushless motor driving circuit includes a deviation detector for receiving a PWM input signal, which issues an instruction for rpm control, and detecting a deviation from duty ratio 50% of the PWM input signal, a determiner for detecting a comparison result at a ... | 09/14/2010 |
| 7777438 | Motor start circuit Motor start circuit for an induction motor-with a main winding and an auxiliary winding having two end connections supplied with current via current supply connections, and with a start circuit device serving the purpose of stopping the current flow through the auxi... | 08/17/2010 |
| 7759888 | AC motor controller There is provided an AC motor controller capable of detecting an abnormal state of a motor cable while an AC motor is operating without using a special circuit but using a processor. The AC motor controller includes an AC motor; an inverter for driving the AC... | 07/20/2010 |
| 7755312 | Motor drive device and electric equipment using this A motor drive device comprising an H-bridge circuit having four switching elements connected in an H bridge form to a motor coil L, a control circuit for on-off controlling each switching element, and a PWM signal generating circuit for generating a PWM signal havin... | 07/13/2010 |
| 7719217 | Drive device for a brushless motor A drive device for a brushless motor executes an abnormality diagnosis (disconnection/short-circuit) of a motor side circuit. In detecting abnormality of the motor side circuit, the drive device includes a terminal voltage monitor circuit that monitors a terminal vo... | 05/18/2010 |
| 7638961 | Drive system and control method of the same In response to a system-off instruction, the drive system control technique of the invention controls individual motors of an electric cooling water pump and an electric cooling fan to stop (step S100), waits for elapse of a preset reference time period since... | 12/29/2009 |
| 7622876 | Overload prevention device for permanent magnet DC motors A method, apparatus or computer program implements an overload prevention approach involving monitoring a speed of a motor; detecting an overload condition of the motor based on the monitored speed; and controlling an operation of the motor according to the detected... | 11/24/2009 |
| 7609016 | Systems and methods for driving a motor A control system includes a controller configured to provide a drive signal, and a switching device configured to generate an output control signal as a function of the drive signal in an on-state mode of operation. The control system also includes a timing network ... | 10/27/2009 |
| 7560885 | Method and apparatus for controlling motor An apparatus for controlling a motor includes a plurality of switching elements configured to switch energizing phases of the motor; and a driving unit configured to drive at least one of the switching elements. The driving unit drives a predetermined switching elem... | 07/14/2009 |
| 7550939 | Redundant instantaneous trip detection A motor circuit protector that trips in accordance with an instantaneous trip curve that is split into three protection regions, a self-protection region, an in-rush avoidance region, and a locked-rotor avoidance region. Software modules for detecting whether primar... | 06/23/2009 |
| 7477031 | Control device for hybrid electric vehicle A hybrid electric vehicle is arranged such that a driving force of an engine and a driving force of an electric motor can be transmitted to driving wheels through a transmission and that the engine and the transmission can be mechanically connected and disconnected ... | 01/13/2009 |
| 7466094 | Motor driving apparatus, and initial driving method for three-phase motor The present invention relates to a method of driving a three-phase electric motor, comprising measuring a three-phase excitation current by selectively exciting two phases; calculating a current difference between excitation phase currents having the same phase; cla... | 12/16/2008 |
| 7453221 | System for controlling rotation of a disk drive A disk drive system is set forth that comprises a rotatable storage medium adapted to store data, a spindle motor disposed to rotate the rotatable storage medium, and a spindle motor control system. The spindle motor control system brakes rotation of the spindle mot... | 11/18/2008 |
| 7420343 | Current limiting DC motor starter circuit A current limiting DC motor starter employing a closed loop current measurement to provide precise current control that adapts to changing motor conditions, integrated with a solid state reversing motor starter. The motor starter further includes a calibrated overcu... | 09/02/2008 |
| 7411366 | Electric power-assist system for manually-operated vehicle An electric power-assist system for a manually operated vehicle, such as a bicycle, has a pedal with Hall sensors for producing a signal representing a rotational speed of the pedal, and an electric motor for power assisting the driving force of the bicycle. A speed... | 08/12/2008 |
| 7400466 | Method and apparatus for driving spindle motor using adaptive feedforward control A method and apparatus for driving a spindle motor using adaptive feedforward control. The method includes: detecting a temperature of a drive; calculating a feedforward value corresponding to the detected temperature; and generating a first control signal that is a... | 07/15/2008 |
| 7388411 | Semiconductor integrated circuit device and semiconductor integrated circuit system A semiconductor integrated circuit device according to the present invention includes: a sample circuit in which through current to be monitored flows during switching between transistors; a non-overlap circuit for outputting an output signal for the switching in th... | 06/17/2008 |
| 7382104 | Backpack style power-pack with flexible drive and quick connect power take-off for connection to a variety of powered tools The present invention relates to portable powered devices or tools for residential, commercial, or industrial applications, in which the power source may be carried on the back of the individual user, power is transferred via a flexible drive shaft, and the powered ... | 06/03/2008 |
| 7382105 | Motor driving device and electric power steering apparatus In a motor driving device where a motor having a winding wire with small inductance value is driven by a digital control means comprised of control means including a current command value calculating means, a current control means and a PWM control means whose sampl... | 06/03/2008 |
| 7375482 | Driving device of motor An object is to provide a driving device capable of smoothly shifting from a starting state to a sensor-less vector control, in a case where the device drives a motor by the sensor-less vector control, and the device includes a voltage detecting circuit which detect... | 05/20/2008 |
| 7368886 | Method of testing motor torque integrity in a hybrid electric vehicle A method of testing an electric motor that is adapted to provide a desired electric motor output torque to a vehicle powertrain system comprising an engine and the electric motor which are operatively and selectively coupled to a transmission. The method includes th... | 05/06/2008 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 03/25/2008 |
| 7339414 | Method and circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance The invention relates to a method and a circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance, which contains a controlled semiconductor switch, such as a triac, and an electric consumer. Said switc... | 03/04/2008 |
| 7334854 | Sensorless start-up method for driving a brushless DC motor At first, a plurality of detection modes are applied in sequence to a brushless DC motor, such that with respect to each of the detection modes a composite magnetic field generated by a motor current flowing through motor coils points in a different direction. Then,... | 02/26/2008 |
| 7321211 | Power variation control system for cyclic loads A method and apparatus for managing power demand of a motor in a cyclic load system having a rotational mass is provided. Flat power draw is achieved through continuous manipulation of the motor torque as a function of feedback velocity while using the rotational ma... | 01/22/2008 |
| 7319490 | Input switch with display and image capturing apparatus using the same An input unit of the present invention includes: an instruction input unit including a display part, a posture of the instruction input unit capable of being displaced by a pressure applied to a first face thereof including a display screen of the display part; a sw... | 01/15/2008 |
| 7298107 | Barrier operator controller with user adjustable force setpoint A control unit for a moveable barrier, such as a garage door, includes a microcontroller connected to a motor speed detector, motor current sensor or a sensor for determining forces exerted on or by the barrier. A user interface includes user actuatable switches for... | 11/20/2007 |
| 7298103 | Control and motor arrangement for use in model train A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arragement further includes a command control interface configured to receive co... | 11/20/2007 |
| 7294988 | Synchronous motor drive unit and a driving method thereof A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its star... | 11/13/2007 |
| 7289897 | Brake device for vehicle A brake device includes an actuator which is provided on a wheel side of a vehicle having a suspension, the actuator generates a braking force by being electrically driven. A drive controller is also provided for receiving a signal regarding the braking force from a... | 10/30/2007 |
| 7285926 | System and method for locomotive adhesion control A traction control system for controlling an electric traction motor drivingly coupled to a wheel of a tractive vehicle. The traction control system includes means for determining speed of the wheel, means for determining tractive effort of the wheel and a control c... | 10/23/2007 |
