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| Number | Title | Issue Date |
| 8183816 | Method for field-oriented operation to zero speed of an encoder-less asynchronous machine In a method for field-oriented operation to zero speed of an encoder-less asynchronous machine, wherein the associated field-oriented regulation device has a monitor with a machine model and rotation-speed adaptation, a model flux and a model current are calculated ... | 05/22/2012 |
| 8183803 | Brushless DC motor control system The present invention relates to a control technology of a three-phase DC motor. In order to resolve a problem in the prior art that the good current closed-loop control has not been realized on a three-phase square-wave brushless DC motor, the present invention pro... | 05/22/2012 |
| 8179066 | Method for controlling a load with a predominantly inductive character and a device applying such a method Method for controlling a load with a predominantly inductive character, whereby in order to feed a phase of the above-mentioned load (3), use is made of at least two connected output voltages, derived from one or several power electronic inverters (11,12;3... | 05/15/2012 |
| 8154240 | Control apparatus for electric railcar A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter reactor provided between the filter capacitor and an overhead line, an ... | 04/10/2012 |
| 8143836 | Motor controller A motor controller capable of effectively utilizing electrical energy accumulated in a capacitor and achieving a reduction in capacitance of the capacitor. The motor controller includes a converter that receives an input AC voltage and performs AC-to-DC power conver... | 03/27/2012 |
| 8125177 | System and method for adding voltages of power modules in variable frequency drives Systems and methods for providing electrical power and to downhole oil production equipment such as electrical submersible pumps, wherein the outputs of multiple power modules are individually filtered before being added together to obtain a high voltage output that... | 02/28/2012 |
| 8115444 | Common mode filter for motor controllers A motor drive circuit has a converter for coupling to an AC voltage source and an inverter coupled to the converter for providing a drive current for a motor. A common mode circulation loop is coupled to the converter and to the inverter, and circulates common mode ... | 02/14/2012 |
| 8102142 | Double ended inverter system for a vehicle having two energy sources that exhibit different operating characteristics A double ended inverter system for an AC electric traction motor of a vehicle is disclosed. The inverter system serves as an interface between two different energy sources having different operating characteristics. The inverter system includes a first energy source... | 01/24/2012 |
| 8102143 | Electric drive unit Electric drive units comprising a common active part having a stator and a rotor, which has windings and/or permanent magnets for a drive function and an energy transmission function, enable the rotor winding that is provided for energy transmission to be used to al... | 01/24/2012 |
| 8091665 | Vehicle drive system and vehicle equipped with it A vehicle drive system comprises inverters connected electrically with a power supply line and a ground line and controlling the current flowing through each stator coil of each of first and second motor generators, and a switch making or breaking the connection bet... | 01/10/2012 |
| 8084985 | Inverter control method Two current threshold values are adopted, which are larger than the upper limit of current of an operating region. When a rotating speed is smaller than a speed threshold value, the current threshold value is adopted as a criterion to judge whether an input current ... | 12/27/2011 |
| 8076896 | Inverter controller and method for operating the same An inverter controller comprising an AC motor as a load. A rectifying circuit converts AC power from an AC power source into DC power. A smoothing capacitor smoothens a DC voltage from the rectifying circuit. An inverter circuit converts DC power supplied via the sm... | 12/13/2011 |
| 8076897 | AC motor driving circuit and electric vehicle driving circuit In an AC motor driving circuit, a current source rectifier is provided on the output side of an AC generator and an AC motor is connected to the output side of the current source rectifier through a voltage source inverter. Along with this, one of terminals of each ... | 12/13/2011 |
| 8054032 | Discontinuous pulse width modulation for double-ended inverter system Systems and methods are provided for controlling a double-ended inverter system having a first inverter and a second inverter. The method comprises determining a required output current and determining a desired second inverter current. The method further comprises ... | 11/08/2011 |
| 8044632 | Power conversion device A power conversion device includes a converter that converts AC power to DC power, a converter controller that controls an output voltage of the converter, an inverter that converts the DC power to AC power at a variable frequency, an inverter controller that contro... | 10/25/2011 |
| 8044633 | Drive device of electric motor An electric motor has a field pole formed by a field current passing through a field winding. A voltage booting converter converts output voltage of a battery and outputs the voltage between a power source line and a grounding line. Field winding is electrically con... | 10/25/2011 |
| 8040101 | Alternating current motor drive circuit and electric vehicle drive circuit A current source rectifier is provided at an output of an alternating current generator, an alternating current motor is connected to an output of the rectifier via a voltage source inverter, furthermore, two arms having switching elements connected in inverse paral... | 10/18/2011 |
| 8026691 | Double ended inverter system with a cross-linked ultracapacitor network A double ended inverter system for an AC traction motor of a vehicle includes a fuel cell configured to provide a DC voltage, an impedance source inverter subsystem coupled to the fuel cell, a DC voltage source, and an inverter subsystem coupled to the DC voltage so... | 09/27/2011 |
| 8013564 | Multi-phase AC motor driving device A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current detecting resistances Ru, Rv, and Rw, respectively arranged on lower arm o... | 09/06/2011 |
| 7990098 | Series-coupled two-motor drive using double-ended inverter system Systems and apparatus are provided for an inverter system for use in a vehicle. The inverter system comprises a six-phase motor having a first set of three-phase windings and a second set of three-phase windings and a three-phase motor having a third set of three-ph... | 08/02/2011 |
| 7986121 | Inverter apparatus and a semiconductor device used for the same An inverter apparatus is for correcting deviations among current detectors of a three-phase motor. The inverter apparatus includes bidirectional switching elements that have on and off states in the cases in which there are 1 and 0 mean on- and off-states. The state... | 07/26/2011 |
| 7982426 | Electric power system An electric power system comprises an AC motor, a first DC voltage unit, an inverter as a power converter, being connected between the AC motor and first DC voltage unit, for exchanging power between these two components; and a controlled DC power supply which is co... | 07/19/2011 |
| 7973510 | Apparatus for controlling inverter The apparatus for controlling an inverter is disclosed which detects a rotation angle of a load using a current supplied to the load when the inverter utilizes a voltage/frequency control to control the driving of the load, and accurately drives the load using the d... | 07/05/2011 |
| 7960937 | Inverter unit, integrated circuit chip, and vehicle drive apparatus A miniaturizable, low-cost highly reliable inverter unit. A control circuit section for controlling operating timing of high breakdown voltage semiconductor elements included in an inverter circuit section and first and second drive and abnormality detection circuit... | 06/14/2011 |
| 7956569 | Double ended inverter system with an impedance source inverter subsystem A double ended inverter system suitable for use with an AC electric traction motor of a vehicle is provided. The double ended inverter system cooperates with a first DC energy source and a second DC energy source, which may have different nominal voltages. The doubl... | 06/07/2011 |
| 7952317 | Motor driving inverter circuit module, motor driving apparatus having the motor driving inverter circuit module, and inverter integrated circuit package The motor driving inverter circuit module includes first-phase, second-phase, and third-phase high voltage drivers generating first-phase, second-phase, and third-phase upper arm and lower arm driving signals in response to input signals for driving the first-phase,... | 05/31/2011 |
| 7948205 | Multi-phase AC motor driving device A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current detecting resistances Ru, Rv, and Rw, respectively arranged on lower arm o... | 05/24/2011 |
| 7936146 | Motor control device A motor control device has: a motor current detecting portion for detecting, based on a current flowing between an inverter and a direct-current power supply, a motor current flowing through a three phase motor; a specified voltage value producing portion for produc... | 05/03/2011 |
| 7923960 | Method for controlling a polyphase voltage inverter A method for driving a power bridge (1) which is used for controlling a multiphase electric load (3), is connectable to said electric load (3) through several arms and is drivable by switching functions determining control vectors for controllin... | 04/12/2011 |
| 7906933 | Apparatus and method for driving an induction motor An induction motor drive includes a plurality of inverters, a changeover switch which changes over outputs of the plurality of inverters to be supplied to one induction motor and a changeover controller which controls the changeover switch on the basis of a failure ... | 03/15/2011 |
| 7898197 | Motor control device A motor control device includes a motor current detector for detecting motor current flowing in a three-phase motor based on current flowing between an inverter driving the motor and a DC power supply, a specified voltage vector generating portion for generating a s... | 03/01/2011 |
| 7888905 | Method and system for controlling a power inverter in electric drives Methods and systems for controlling a power inverter in an electric drive system of an automobile are provided. A signal controlling the power inverter is modified utilizing a first voltage distortion compensation method if a modulation index of the signal is less t... | 02/15/2011 |
| 7880426 | Polyphase voltage converter control method A method for driving a power bridge (1) which is used for controlling a multiphase electric load (3), connectable to said electric load (3) via several arms and drivable by switching functions which determine free wheel controlling vectors and a... | 02/01/2011 |
| 7876064 | Motor drive inverter that includes III-nitride based power semiconductor devices An inverter for driving a motor includes one or more power stages for producing one or more power signals for energizing the motor, each power stage including first and second III-nitride based bi-directional switching devices connected in series between a DC voltag... | 01/25/2011 |
| 7872441 | Systems and methods for operating Z-source inverter inductors in a continuous current mode Systems, apparatus, and methods for operating inductors in a Z-source inverter in a continuous current mode are provided. One system includes an AC motor, a Z-source inverter, and a processor. The inverter is configured to provide current and reactive power to the A... | 01/18/2011 |
| 7855527 | Inverter device The inverter device contains the following structure: an inverter circuit which has upper-arm switching elements that are connected on a positive side of a DC power source and lower-arm switching elements that are connected on a negative side of the DC power source;... | 12/21/2010 |
| 7852040 | Motor driver system and method for controlling motor driver A motor driver system and its control methods are discussed. Even when a command magnetic flux decreases as a motor operates in a field weakening region, a current angle can be maintained always below a limit value, thereby obtaining the stability of the motor contr... | 12/14/2010 |
| 7847499 | Electric load apparatus, electric load controlling method and computer readable recording medium recording program for causing computer to execute control of electric load An electric load apparatus (100) includes a DC power source (B), a voltage sensor (10, 20), system relays (SR1, SR2), a capacitor (11, 13), a DC/DC converter (12), an inverter (14), a current sensor (24), a rot... | 12/07/2010 |
| 7843161 | Inverter device This invention provides an inverter device that can detect a step-out state of an AC motor by a simple process without depending on a rotation speed of the AC motor and also surely hold an abnormal state in the step-out state of the AC motor. The inverter device ... | 11/30/2010 |
| 7843162 | Current regulator and current control method and system for AC motors Methods and systems are provided for controlling an AC motor via an inverter. The method includes determining a delay-compensated offset based on a synchronous frame current, producing a current error based on a synchronous frame current and a commanded current, pro... | 11/30/2010 |
