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| Number | Title | Issue Date |
| 8148937 | Alternating-current motor control apparatus When a rectangular wave voltage control mode is selected, a control apparatus estimates the output torque of an alternating-current motor based on the outputs of a current sensor and a rotation angle sensor, and executes torque feedback control by adjusting the phas... | 04/03/2012 |
| 8076899 | Valve timing control apparatus An electric power supply driver executes duty control of turning on and off of a selected switching element to supply electric power to a corresponding stator coil in a case where an actual rotational direction and a target rotational direction of a motor shaft coin... | 12/13/2011 |
| 7999503 | Control module for dynamic operation of a power inverter using an application specific integrated circuit Systems and apparatus are provided for a control module for operating an inverter in a vehicle. A control module comprises a first circuit card assembly and a microprocessor mounted on the first circuit card assembly. The microprocessor is configured to determine a ... | 08/16/2011 |
| 7911176 | Systems and methods involving permanent magnet electric machine rotor position determination A method for determining rotor position comprising sending a signal to a stator, receiving a first signal indicative of a first estimated stator inductance, and receiving a second signal indicative of a second estimated stator inductance. The method further includes... | 03/22/2011 |
| 7868581 | Induction motor analysis and control method An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of... | 01/11/2011 |
| 7701165 | Induction motor controller An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of... | 04/20/2010 |
| 7667428 | Fan system and power monitoring apparatus thereof A power monitoring apparatus for receiving an external input signal includes a first modulating unit, a second modulating unit and a comparing unit. The first modulating unit receives and modulates an input signal into a first signal. The second modulating unit rece... | 02/23/2010 |
| 7518334 | Method and device for controlling a brushless DC motor A method and a control device for a brushless DC motor, which has an AC/DC inverter supplied by an intermediate direct voltage circuit for feeding the DC motor, a pattern generator for controlling switches of the AC/DC inverter having a variable frequency and phase ... | 04/14/2009 |
| 7443129 | Quenching device for a converter bridge with line regeneration There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-ph... | 10/28/2008 |
| 7432678 | Motor driving apparatus and control method thereof A motor driving apparatus includes a speed control circuit for outputting a speed control signal on the basis of a target speed command and rotating speed information of a motor, a PWM signal generating circuit for generating and outputting a PWM signal on the basis... | 10/07/2008 |
| 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 |
| 7362597 | AC voltage generating apparatus and motive power outputting apparatus A motive power outputting apparatus includes motor generators, inverters, and a transformer. The motor generator includes a three-phase coil, and the motor generator includes a three-phase coil. The inverter allows an in-phase AC current to pass through an U-phase c... | 04/22/2008 |
| 7358700 | Induction motor controller An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of... | 04/15/2008 |
| 7345449 | Method of rotating a polyphase motor at less than rated speed A polyphase AC induction motor is connected to a power supply through a soft starter having three sets of inverse parallel connected silicon controlled rectifiers with each set corresponding to one particular phase. Low speed starting and operation of the motor can ... | 03/18/2008 |
| 7342380 | System and method for adjustable carrier waveform generator A system and method for controlling an inverter of a motor control unit includes a controller having a user interface configured to allow user selection of a waveform increment value or a waveform amplitude threshold. The controller also includes an integrator confi... | 03/11/2008 |
| 7337526 | Method for manufacturing squirrel cage rotor Ceramic adhesive is applied inside the slots of an electric machine squirrel cage rotor prior to casting or insertion of rotor conductors. This heat-resistant insulation provides superior electrical insulation that is also mechanically rugged, thus enabling casting ... | 03/04/2008 |
| 7336514 | Electrical power conservation apparatus and method An electrical power control apparatus and method for power factor correction in a conventional 60 hertz or other conventional frequency electrical AC power supply communicated to an inductive load. A plurality of interruptions of current in the line on both sides of... | 02/26/2008 |
| 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 |
| 7315147 | Motor and motor drive system Provided is a motor having a combination of a plurality of coil pairs and a permanent magnet, wherein these coil pairs are supplied with an excitation signal from a drive circuit so as to be excited at alternate opposite poles, and the permanent magnet is constitute... | 01/01/2008 |
| 7294989 | Frequency converter overvoltage protection A method of protecting a frequency converter against overvoltage by controlling an AC motor during braking or during light load and a frequency converter, wherein the frequency converter is a voltage-controlled PWM frequency converter operating in single quadrant ( | 11/13/2007 |
| 7279865 | Method and apparatus for monitoring motor status using induced motor voltage A motor drive unit includes a controller, a voltage inverter, and a speed estimator. The controller is operable to generate at least one command signal for controlling a motor associated with the motor drive unit. The voltage inverter is operable to generate motor d... | 10/09/2007 |
| 7271565 | Apparatus for controlling speed of fan motor of air-conditioner An apparatus for controlling a speed of a fan motor (HIM (Hybrid Induction Motor)) of an air-conditioner extends a speed control range of a fan motor of an air-conditioner by controlling revolutions per minute (RPM) of the fan motor. In order to extend the speed con... | 09/18/2007 |
| 7250740 | Method and apparatus for generating pulse-width modulated waveform In a method of generating pulse-width modulated waveform, the cycle of a carrier wave for the waveform is determined together with a first dead time value and a second dead time value both of which are set in a plurality of up-down counters, respectively. Using the ... | 07/31/2007 |
| 7242248 | Class D amplifier A Class D amplifier receives an input signal and comprises a crossing detector and a signal generator that generates first and second periodic signals. Each period of the first periodic signal comprises first and second intervals, and each period of the second perio... | 07/10/2007 |
| 7211973 | System and process for utilizing back electromotive force in disk drives A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utiliz... | 05/01/2007 |
| 7208911 | Method for controlling a cycle-skipping control system including computer readable code and controller for performing such method A method, computer-readable code, and controller are provided for controlling a cycle-skipping control system having at least one cycle skipper connected to a multi-phase AC (alternating current) power source to drive a variable frequency load. A respective firing s... | 04/24/2007 |
| 7208910 | Method for modifying baseline circuit architecture for a cycle-skipping control system including computer readable code and controller for performing such method A method, computer-readable code, and controller are provided for configuring a cycle-skipping control system having two or more cycle skippers connected to a common multi-phase AC (alternating current) power source to drive a variable frequency load. One or more ci... | 04/24/2007 |
| 7208903 | Control device for alternating-current motor In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational freque... | 04/24/2007 |
| 7196491 | System and method for stall detection of a motor A motor starter system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A voltage sensor senses AC line voltage and the motor terminal voltage. Current sensors sense motor curr... | 03/27/2007 |
| 7193387 | System and method for motor speed estimation using hybrid model reference adaptive system Motor drives, motor speed controllers, motor speed estimation systems, and methods are presented for controlling motor startup speed and for estimating motor speed during startup, in which a speed estimate controller provides a rotor speed estimate based on a first ... | 03/20/2007 |
| 7187155 | Leakage inductance saturation compensation for a slip control technique of a motor drive An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop. The control is based on a command... | 03/06/2007 |
| 7168118 | Method for controlling spinning speed in drum-type washing machine Object of the present invention lies on improving a system stability by reducing an allowable eccentricity of laundry below a preset value when a spinning speed reaches to a maximum even if a voltage higher than a rated voltage is applied, by varying a maximum limit... | 01/30/2007 |
| 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 |
| 7135834 | Modified field oriented control In accordance with certain embodiments, the present technique provides a reduced current field-oriented-control scheme. For example, the present technique provides a method of controlling an induction device in which a predetermined reduction factor is employed to r... | 11/14/2006 |
| 7135833 | Motor control for flux-reduced braking A method and apparatus for braking an AC motor in the higher portion of its speed range includes substantially reducing flux before applying reverse torque commands to brake the motor. A DC link bus regulator is employed to prevent increases in bus voltage and frequ... | 11/14/2006 |
| 7129672 | Controller apparatus for synchronous motor and controlling method thereof For providing a controller apparatus for a synchronous motor and a controlling method thereof, enabling to be manufactured, easily and cheaply, and to obtain a lock mechanism, but without necessity of mechanisms, such as, an electromotive lock mechanism, wherein the... | 10/31/2006 |
| 7122985 | Sensorless brushless motor A sensorless brushless motor controls a rotational speed of a rotor by sequentially energizing a plurality of excitation coils constituting a stator in accordance with a logical product between an energizing timing signal generated on the basis of a back electromoti... | 10/17/2006 |
| 7106024 | Filter with increased first harmonic response and reduced phase shift in a wide frequency band for encoderless drive applications A method and apparatus for use with a controller that supplies voltages to an induction machine via supply lines, the voltages including a fundamental voltage component and an injected voltage component, the line voltages also including harmonic voltage components w... | 09/12/2006 |
| 7102312 | Motor driving apparatus, driving method thereof and mobile terminal A motor driving apparatus and a driving method thereof, and a mobile terminal in which a terminal voltage value of a terminal is detected at a terminal voltage detection unit, and is held in a holding circuit. A difference between the terminal voltage value detected... | 09/05/2006 |
| 7102305 | Apparatus and method for controlling motor A motor control apparatus includes a direct-current power source and an inverter circuit, which includes a switching element. The motor control apparatus receives a current command value in every control cycle and calculates a current deviation accumulated value by ... | 09/05/2006 |
