Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8169180 | Motor controller of air conditioner The present invention relates to a motor controller of an air conditioner, including a converter for converting a commercial AC power into a DC power, an inverter including a plurality of switching elements, the inverter receiving the DC power, converting the DC pow... | 05/01/2012 |
| 8164298 | System and method for detecting loss of isolation while an AC motor is operating Methods and systems are provided for detecting loss of isolation of a motor, connections, or phase cables while an AC motor is operating. The system includes a power supply that is substantially isolated from the ground or chassis having a power supply voltage, and ... | 04/24/2012 |
| 8143840 | Device for controlling induction motor A device for controlling an induction motor includes a voltage/frequency controller, a pulse width modulation controller, and a converter. The voltage/frequency controller receives a controlling frequency, and outputs a controlling voltage corresponding to the contr... | 03/27/2012 |
| 8129931 | Motor control device, motor drive system, washing machine, air conditioner and method of changing magnetization amount of permanent magnet motor A motor control device includes a magnetization control unit energizing a motor winding to change magnetic flux content of permanent magnet motor, a current detector detecting current supplied to the motor, a vector control unit including a speed/position estimation... | 03/06/2012 |
| 8120307 | System and method for providing constant loading in AC power applications A system and method are provided for constant loading in AC power applications where at least one turn-on point of at least one half cycle of a modulating sine wave is randomly selected; at least one turn-off point is determined; and at least one slice located betwe... | 02/21/2012 |
| 8115445 | Operation control method and operation control apparatus for variable speed generator-motor An excitation device supplies a three-phase AC excitation current to a variable speed generator-motor, and controls the variable speed generator-motor based on a three-phase AC excitation current command value obtained by vector-synthesizing, based on a slip phase f... | 02/14/2012 |
| 8106622 | Control system for multiphase rotary machines A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the contro... | 01/31/2012 |
| 8089241 | Motor drive control apparatus, vehicle equipped with motor drive control apparatus, and motor drive control method When a target operation point of either a motor MG1 or a motor MG2 is included in a resonance range specified by operation points of the motor MG1 or the motor MG2 in the occurrence of resonance in a booster converter, a hybrid vehicle co... | 01/03/2012 |
| 8040090 | Brushless motor controller and brushless motor A brushless motor controller that controls a brushless motor by determining an energizing timing of a three-phase stator coil based on the rotational position and speed of a rotor. The controller includes a normal timing generation unit, an advancing timing generati... | 10/18/2011 |
| 8035334 | Electric power converter A voltage-command correction unit provided between an electric-power conversion unit and a voltage-command calculation unit provides a predetermined current range including the zero level for the detected output current, and, at a first clock time when the output cu... | 10/11/2011 |
| 8022659 | Control apparatus for AC rotary machine and control method for AC rotary machine A control apparatus for a rotary machine, comprising a variable-voltage variable frequency (VVVF) inverter for driving the rotary machine, a voltage detector for detecting a DC voltage at the inverter's input, current detectors for detecting phase currents of the ro... | 09/20/2011 |
| 8022660 | Control apparatus for AC rotary machine A control controls starting of an AC rotary machine by calculating a resistance drop component, corresponding to a resistance drop of the AC rotary machine, based on a detection current, and adjusts angular frequency of an AC output voltage based on subtracting the ... | 09/20/2011 |
| 8018195 | AC motor drive control device and method An AC motor drive control device includes a control mode judgment unit that performs a judgment based on required voltage amplitude required by a synchronous AC motor, in order to switch units for applying voltage to the AC motor to one of a rectangular wave voltage... | 09/13/2011 |
| 7902791 | Controller for variable speed alternating current motor A controller for operating a variable speed alternating current motor using inverters to which power is supplied from two or more power supplies including an energy accumulator has a first inverter for converting direct current supplied from the outside into alterna... | 03/08/2011 |
| 7825623 | Electric vehicle drive apparatus In an electric vehicle drive apparatus having an electric motor and a motor drive device, the electric motor having a stator, a rotor and a moving mechanism capable of changing a relative distance between the stator and the rotor to vary an effective magnetic flux o... | 11/02/2010 |
| 7710067 | Power supply system and power supply system control method A power accumulating unit of a power supply system includes a first switch section configured to achieve a first voltage output state in which an output voltage is substantially equal to a first motor driving voltage and a second switch section configured to achieve... | 05/04/2010 |
| 7679311 | System and method for dynamic field weakening A field weakening control system for use with an induction motor is disclosed. The field weakening control system has a sensing device configured to generate a signal indicative of a speed of the induction motor and a controller. The controller is configured to dete... | 03/16/2010 |
| 7436142 | Method for maintaining a direct voltage at the input of a DC/AC voltage converter, recording medium for this method, and electric vehicle This method maintains a direct voltage at the input of a DC/AC voltage converter in order to maintain an asynchronous motor in a magnetised state, the input of the converter being connected to a DC supply bus of an electric vehicle, and comprises, in a free wheel mo... | 10/14/2008 |
| 7411369 | Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage ... | 08/12/2008 |
| 7408323 | Frequency converter, motor, motor drive system and maintenance method for motor drive system A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a... | 08/05/2008 |
| 7402919 | Control device for motor-driven 4WD vehicle and related method A control device controlling a motor-driven four wheel drive vehicle, where either of front wheels and rear wheels are driven by an engine and the others are driven by an AC motor, is provided with an electric power generator driven by an engine to generate first th... | 07/22/2008 |
| 7388347 | Method and inverter for controlling a direct current motor A three-phase direct-current motor is controlled by cyclically repeating three first switching states. In each of the three first switching states, one of the three phases of the direct-current motor is periodically switched over between a first and a second input v... | 06/17/2008 |
| 7385371 | Vector controller for induction motor A vector controller of an induction motor capable of correcting the set value of mutual inductance so as to match it to an actual value by additional processing on software without adding any special device. The vector controller (1) of an induction motor com... | 06/10/2008 |
| 7372233 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a ... | 05/13/2008 |
| 7368890 | Power converter with active discharging for improved auto-restart capability A method of operating a power converter in response to an interruption in an input power being provided to the power converter, as well as a power converter capable of performing such method and including a rectifier and an inverter coupled at least indirectly with ... | 05/06/2008 |
| 7348758 | Audible noise reduction for single current shunt platform A method and system for reducing audible motor noise in a system for reconstructing motor phase current from a DC bus current comprising current pulses on a DC bus in a PWM inverter motor drive system having a PWM cycle, and for controlling the motor, which forms a ... | 03/25/2008 |
| 7330011 | Motor driving apparatus A motor driving apparatus includes an inverter circuit for converting an output of a rectifier circuit connected to a single-phase AC power supply into a driving voltage, and outputting the driving voltage to a brushless motor, and an inverter control unit for contr... | 02/12/2008 |
| 7317292 | AC motor control method and control device It is possible to control the DC intermediate voltage to be constant without using a device for returning regenerative resistance or regenerative energy to a power source and to safely continue operation of an AC motor even if an instantaneous stop occurs. An AC mot... | 01/08/2008 |
| 7310475 | Motor driving apparatus A motor driving apparatus is provided which can minimize ripple current flowing through a DC link capacitor, and downsize the motor driving apparatus. It synchronizes the frequency of the inverter carrier signal for driving an inverter with the frequency of the DC/D... | 12/18/2007 |
| 7301301 | Electric car control apparatus In an electric car control apparatus for driving an induction motor, detection accuracy of a DC voltage is improved. A DC power supply device is provided which has a maximum potential terminal A, an intermediate potential terminal B, a minimum potential terminal C, ... | 11/27/2007 |
| 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 |
| 7281903 | Device for varying the pressure of the fluid delivered by a jet washer Device for varying the delivery pressure of a jet washer comprising a positive-displacement pump operated by a single-phase electric motor powered by alternating current and having a delivery nozzle of predetermined cross-section, and electronic means for controllin... | 10/16/2007 |
| 7282883 | Pivoting and barrier locking operator system A system for moving a barrier between limit positions, includes an operator motor assembly mounted proximate to the barrier, wherein at least a portion of the motor assembly is movable between an operating position and a locking position with the motor assembly bloc... | 10/16/2007 |
| 7282887 | Laser diode triggered soft start controller for a polyphase electric motor A solid state soft start controller system has a power supply, an electric motor, a thyristor electrically interconnected between the power supply and the electric motor so as to selectively allow current to pass from the power supply to the phases of the electric m... | 10/16/2007 |
| 7272479 | Electrically operated power steering controller and adjusting method of driving electric current offset in this controller The invention proposes an electrically operated power steering controller for inputting a driving electric current offset value of higher accuracy and being able to make an offset correction of a driving electric current by using this driving electric current offset... | 09/18/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7262577 | Method for estimating the sum of stator and rotor resistances A method for estimating the sum of the stator and rotor resistances of an induction machine using a frequency converter when the frequency converter is connected to the induction machine. The method comprises the steps of controlling the stator current of the induct... | 08/28/2007 |
| 7245095 | Control circuit of rotational speed of a fan A control circuit of rotational speed of a fan is provided, wherein by a switching of a switch unit, a PWM (Pulse Wide Modulation) unit can output a sampling pulse whose period is changing. A voltage is also changing following the period after taking a sample to an ... | 07/17/2007 |
| 7242163 | System and method for clamp current regulation in field-weakening operation of permanent magnet (PM) machines A device to regulate current produced by a permanent magnet machine responsive to a plurality of phase current signals. The motor produces torque for application on a shaft. A processing and drive circuit responsive to a direct current command signal and a quadratur... | 07/10/2007 |
| 7230403 | System and method for elimination of DC offset feedback in AC drives A DC offset compensation system and method significantly reduce a DC offset voltage in the voltage feedback loop of an AC motor drive control system. A control voltage error signal is demodulated and filtered and applied to the closed loop voltage feedback signals t... | 06/12/2007 |
