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| Number | Title | Issue Date |
| 8164292 | Motor controller of air conditioner The present invention relates to a motor controller, including a converter for converting commercial AC power into DC power, an inverter including a plurality of switching elements, the inverter receiving the DC power, converting the DC power into AC power of a spec... | 04/24/2012 |
| 8120299 | Motor controller of air conditioner The present invention relates to a motor controller of an air conditioner, including an inverter including a plurality of switching elements and adapted to convert a DC voltage, input through switching operations of the switching elements, into an AC voltage and sup... | 02/21/2012 |
| 7855524 | Voltage control and power factor correction in AC induction motors A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may combine the power factor correct with an AC induction motor. ... | 12/21/2010 |
| 7598692 | Electric power converter, electric power converter controlling method and electric power converting system An electric power converter, electric power converter controlling method and electric power converting system for converting multi-phase alternating-current inputted from a generator and outputting multi-phase alternating current for controlling a drive of a motor. ... | 10/06/2009 |
| 7495404 | Power factor control for floating frame controller for sensorless control of synchronous machines A system and method of controlling the power factor for providing either unity, leading or lagging results for the sensorless control of synchronous machines. The system and method provides an estimated angle of the phase current Park vector and uses a floating sync... | 02/24/2009 |
| 7420344 | Intelligent shift paper shredding mechanism and method of automatic shift of the same An intelligent shift paper shredding mechanism and a method of automatic shift of the same in accordance with the present invention includes a control circuit including a control chip electrically connecting with a shift circuit and a locked-stator detect circuit. T... | 09/02/2008 |
| 7354165 | Vehicle mirror system with control rise detent assembly A vehicular mirror system comprises a base frame attached to a motor vehicle and a support frame supporting a reflective element assembly and pivotally attached to the base frame for pivoting the reflective element assembly between a folded position and an unfolded ... | 04/08/2008 |
| 7317624 | Power factor correction method and apparatus and power supply using the same A power factor compensation method and apparatus adapted for use in a power supply which provides direct-current (DC) power via a capacitive input type smoothing circuit, and an improved power supply using the same. The power factor compensation method can correct a... | 01/08/2008 |
| 7309973 | Mitigation of harmonic currents and conservation of power in non-linear load systems An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-co... | 12/18/2007 |
| 7287869 | Vehicle mirror apparatus A vehicle mirror apparatus includes a stationary side shaft holder which has a shaft (3) and which is provided on a mirror base and a housing (5) which has rotating unit (6) and which can rotate around the shaft (3), the shaft (3) ... | 10/30/2007 |
| 7256564 | System and method for attenuating noise associated with a back electromotive force signal in a motor A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the mot... | 08/14/2007 |
| 7205739 | System and method for attenuating noise associated with a back electromotive force signal in a motor A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the mot... | 04/17/2007 |
| 7193383 | Enhanced floating reference frame controller for sensorless control of synchronous machines A method and system for controlling a power converter coupled to a polyphase power line. The method includes measuring at least two motor phase currents, obtaining a floating reference frame for the current Park vector, adjusting the reference frame based on an esti... | 03/20/2007 |
| 7193388 | Offset PWM signals for multiphase motor A multi phase motor includes a switching array for interconnecting a power source to each phase. A current sensor senses current supplied from the power source via the switching array to the winding and a controller generates offset PWM signals for controlling the s... | 03/20/2007 |
| 7184249 | Electric motor circuit with overload protection An electric motor circuit utilized, for instance, for adjusting a wing mirror of a vehicle is provided with a motor with a driving circuit. The driving circuit includes a relay switch element included in series with the motor and a protecting circuit for bringing th... | 02/27/2007 |
| 7172298 | Power fold mechanism for vehicle mirrors A power-folding vehicle mirror assembly is described, including: a base; a mirror head assembly mounted to the base for movement from a drive position to a front position and for movement from the drive position to a park position; a first clutch body mounted to the... | 02/06/2007 |
| 7157877 | Brushless motor driving device A brushless motor driving device having a current detecting unit for detecting a phase-current of a brushless motor, a voltage detecting unit for detecting a phase voltage of the brushless motor, and a signal input portion to which the detection value of the phase-c... | 01/02/2007 |
| 7154253 | Digitally controlled modular power supply for automated test equipment A digitally controlled hybrid power module is controlled by a programmable controller. The hybrid power module includes a digitally controlled switching supply with an output coupled to an input of a digitally controlled linear voltage regulator. Independent control... | 12/26/2006 |
| 7106018 | Method of balancing the rotation of a motor A method of balancing the rotation of a motor is provided. Whether or not the motor is in a balanced rotation is determined by detecting whether the variation of a power-factor angle is less than or equal to a preset balance angle according to the principle that the... | 09/12/2006 |
| 7104660 | Motorized retracting unit and motorized retractable rearview mirror A motorized retracting unit for a motorized retractable rearview mirror for a vehicle includes a shaft holder that has a main shaft, a gear case that is rotatably mounted on the main shaft, a plate, and a transmission mechanism that transmits driving power of a moto... | 09/12/2006 |
| 7102314 | Brushless motor control apparatus having overheat protecting function A brushless motor control apparatus detects a phase current flowing in a brushless motor, converts the phase current to a vector current including a d-axis current of a magnetic flux direction component and a q-axis current of a torque direction component orthogonal... | 09/05/2006 |
| 7095208 | Inverter controller for driving motor and air conditioner using inverter controller A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter, so that a small, light and low-cost inverter controller for driving a motor can be i... | 08/22/2006 |
| 7090470 | Apparatus and method for preventing a piston and valve collision in a linear compressor An apparatus and method for controlling a linear compressor is provided. The linear compressor controlling apparatus includes a voltage detection unit, a current detection unit, a control unit and a compressor drive unit. The voltage detection unit detects a voltage... | 08/15/2006 |
| 7061195 | Global closed loop control system with dv/dt control and EMI/switching loss reduction A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides ... | 06/13/2006 |
| 7049774 | Apparatus for controlling power factor compensation in inverter control circuit and method thereof The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power facto... | 05/23/2006 |
| 7038329 | Quality power from induction generator feeding variable speed motors A prime mover (28) in a heat recovery system drives an induction generator (8) which feeds power to a utility grid (9) through a breaker (10) but also powers a load including auxiliary induction motors (11, 12). To provide acceptab... | 05/02/2006 |
| 7023160 | Method for controlling doubly-fed machine A method for operating a doubly-fed machine by determining its rotational speed (nact), forming a rotational speed reference (nref), measuring network voltage and current, and calculating network active power (Pact) and reactive powe... | 04/04/2006 |
| 7008067 | Electrically operable pivoting actuator for door mirror of motor vehicle An electrically operable pivoting actuator for a door mirror is disclosed. The pivoting actuator comprises a frame, an electromotor, and an annular coupling member secured onto a horizontally extended support of the door mirror, the coupling member comprising two di... | 03/07/2006 |
| 6998814 | Method for measuring the electromotive force constant of motors A method for measuring the electromotive force of motors is provided. The method enables the motor to rotate in single phase mode, and thereby measures the electromotive force constant of the motor. According to the principles and the method, motors do not have to w... | 02/14/2006 |
| 6979091 | Door mirror set plate A door mirror set plate is formed of synthetic resin. On a base plate, a support shaft is vertically provided to rotatively support a door mirror body. A curved surface section is embedded at an outside periphery of a base of the support shaft. A flat section is for... | 12/27/2005 |
| 6958589 | Inverter controller for driving motor and air conditioner using inverter controller A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter. A PN voltage corrector calculates a ratio of the DC voltage detection value of the i... | 10/25/2005 |
| 6933693 | Method and apparatus of detecting disturbances in a centrifugal pump The present invention is directed to a centrifugal pump wherein voltage and current data are detected from voltage and current sensors in the motor controller of a pump motor. A power signal is then generated from the voltage and current data and spectrally analyzed... | 08/23/2005 |
| 6919712 | Excitation control device and excitation control method A reference voltage of an output terminal of a synchronous machine is set according to a reactive current output from the synchronous machine, a reference voltage of the high voltage side of a transformer, and a phase compensation transfer function to quicken attenu... | 07/19/2005 |
| 6882913 | Electrical control system for automotive vehicle having electrically assisted power steering An electrical system for increasing the amount of voltage available to an electric power steering motor under high demand conditions includes a vehicle speed sensor that ascertains the speed of the vehicle, a steering wheel sensor that ascertains the rotational spee... | 04/19/2005 |
| 6819072 | Disk drive servo arm retract and spindle brake circuit A spindle motor control circuit for controlling a motor; including a control circuit to control the motor during at least a low state, a pulse state and a high state, the motor braking during said low state, the control circuit receiving a flyback voltage from the m... | 11/16/2004 |
| 6801005 | Method and apparatus for controlling three-phase power A method and apparatus for controlling the supply of three-phase power by calculating phase trigger firing delays for all six zero-crossing points based on the measurement of one zero-crossing point of one phase. The method includes the steps of (a) measuring the ze... | 10/05/2004 |
| 6741059 | Controller for a wound rotor slip ring induction machine The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to cont... | 05/25/2004 |
| 6720753 | Power generation system using synchronous generator An apparatus for controlling a synchronous generator having a converter. A voltage detector detects a terminal voltage of a stator of the synchronous generator. A current detector detects a current flowing through the stator. A rotor position estimating part estimat... | 04/13/2004 |
| 6709240 | Method and apparatus of detecting low flow/cavitation in a centrifugal pump The present invention is directed to a centrifugal pump wherein voltage and current data are detected from voltage and current sensors in the pump motor. A power signal is then generated from the voltage and current data and spectrally analyzed to determine the low ... | 03/23/2004 |
| 6559619 | Energy management controller An improved energy controller that increases the electrical efficiency of AC induction motors and electrical lights that is comprised of a microcontroller integrated with a signal control circuit to regulate the amount of the input line A/C signal that pa... | 05/06/2003 |
