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| Number | Title | Issue Date |
| 8084986 | Dead-time compensation apparatus of PWM inverter and method thereof A dead-time compensation method is applied to a PWM inverter, which is provided to drive an induction motor using a constant V/f control. The method first calculates a root-mean-square current of the output instantaneous current of the inverter. Afterward, a lookup ... | 12/27/2011 |
| 8072181 | Controller for electrically adjustable furniture A controller for electrically adjustable furniture includes a main-voltage area and a low-voltage area that are electrically isolated from one another. A rectifying power supply unit, which is located in the main-voltage area, serves to generate a rectified voltage ... | 12/06/2011 |
| 7821224 | Voltage estimation feedback of overmodulated signal for an electrical vehicle A voltage estimation system for motor control feedback is described. The system may include one or more control modules which may generate voltage commands. An overmodulation or “clipping” module receiving a voltage command can generate a clipped voltage. Rather... | 10/26/2010 |
| 7808203 | Motor control device A motor control device that includes a first speed estimator estimating the rotation speed of the rotor of a permanent-magnet synchronous motor and that controls the motor so that a first estimated rotation speed estimated by the first speed estimator follows the sp... | 10/05/2010 |
| 7432683 | PWM pattern sequence to reduce losses in voltage source inverters A method for controlling an inverter uses sequences of predetermined states where each state uniquely corresponding to a set of control signals provided to the inverter that is coupled to a motor. The method includes repeatedly applying a first center null timing se... | 10/07/2008 |
| 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 |
| 7405534 | Apparatus and method for controlling velocity of motor An apparatus controlling a velocity of a motor having a rotor, includes a sensing velocity calculator sensing a rotation velocity of the motor, and calculating a sensing velocity on the basis of the sensed rotation velocity of the motor; a velocity estimator estimat... | 07/29/2008 |
| 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 |
| 7385372 | Auxiliary bus system Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power fro... | 06/10/2008 |
| 7358699 | Rotating electric machine with built-in control device The invention is intended to obtain a rotating electric machine with a built-in control device in which the control device is kept from receiving heat from a main body of the rotating electric machine and the control device can be cooled in a desirable fashion. A he... | 04/15/2008 |
| 7350435 | Motor, especially a gear motor or a selector motor of a transmission actuating system, and method for detecting the moving direction of a motor The invention relates to a method for determining the moving direction of a motor, especially an electric motor of a transmission actuating system for gear selection and/or shifting, whereby at least one signal of the motor is detected. The inventive method is chara... | 04/01/2008 |
| 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 |
| 7339334 | Real-time responsive motor control system The present invention discloses a real-time responsive motor control system comprising a central MCU (Microcontroller Unit) core logic and at least one PWM (Pulse Width Modulation) MCU core logic. The central MCU core logic takes care of all interrupt events. The PW... | 03/04/2008 |
| 7340355 | Compensated current differential relaying method and system for protecting transformer Disclosed is a compensated current differential relaying method and system for protecting a transformer more correctly by calculating and estimating an exciting current including a core-loss current and a magnetizing current, and, in particular, to a compensated cur... | 03/04/2008 |
| 7339346 | Motor and drive control device therefor The invention provides a motor for a brushless DC motor, which has small torque ripple even if a trapezoidal wave current is supplied and has a small size and reduced motor noise, and a drive control device for the motor as well as an electric power steering apparat... | 03/04/2008 |
| 7339344 | Self tuning method and apparatus for permanent magnet sensorless control A plurality of parameters of a Permanent Magnet Synchronous Motor (PMSM) is determined by a motor controller for differentiating between a plurality of PMSMs. This is achieved by first applying regulated DC motor currents at a commanded fixed rotor angle and measuri... | 03/04/2008 |
| 7333413 | Optical storage device rotation speed control apparatus and method A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sen... | 02/19/2008 |
| 7330012 | High frequency bus system Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power fro... | 02/12/2008 |
| 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 |
| 7292004 | Motor driving apparatus A motor driving apparatus for driving a motor includes a single-phase rectifier circuit having an input connected to a single-phase AC power supply, an inverter circuit that is connected to the single-phase rectifier circuit and applies a current and a voltage to th... | 11/06/2007 |
| 7288922 | Control apparatus for automotive alternator having capability to accurately detect temperature of alternator A control apparatus for a vehicle generator includes a switch, a regulator, a fault condition detector, and a PWM signal generator. The switch is selectively turned on and off so as to intermittently excite the generator. The regulator controls on/off operation of t... | 10/30/2007 |
| 7272302 | PSC motor system for use in HVAC applications with field adjustment and fail-safe capabilities A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides... | 09/18/2007 |
| 7265954 | Method for estimating DC motor coil temperature, DC motor control method and their devices Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil. ... | 09/04/2007 |
| 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 |
| 7244106 | Process and device for flow control of an electrical motor fan A method and configuration from maintaining a constant of air to a protective helmet (4) from a fan (3) in a battery powered fresh air unit. The fan (3) is a radial fan with a filter (5) positioned on the suction side of the fan and is op... | 07/17/2007 |
| 7239102 | Phase adjustment circuit, motor driving control circuit, and motor apparatus A motor apparatus is constructed to compensate for a delay in operation of the motor apparatus, so that the efficiency is improved and noise is reduced over a broad motor rpm range by driving the motor at the optimum timing. The motor driving control circuit of the ... | 07/03/2007 |
| 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 |
| 7227323 | Motor driving apparatus A motor driving apparatus applicable to various types of motor driving apparatuses and having a power storage section for storing a regenerative current and supplying power to an inverter section at the time of acceleration. The motor driving apparatus further compr... | 06/05/2007 |
| 7227331 | Safety interlock and protection circuit for permanent magnet motor drive A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and... | 06/05/2007 |
| 7221121 | Frequency converter for different mains voltages The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According to the present invention, the maximum output power of the frequency converter... | 05/22/2007 |
| 7218074 | Method and system for limiting the current output by a speed controller operating according to a U/F control law The present invention relates to a method for limiting the current output by a speed controller (V) for three-phase asynchronous electric motor (M), said controller (V) operating according to a control law (LC) of pure U/F type. Said method is characterized in that ... | 05/15/2007 |
| 7212407 | Electrical power converter method and system employing multiple output converters A support may receive one or more power electronic circuits. The support may aid in removing heat from the circuits through fluid circulating through the support. The support, in conjunction with other packaging features may form a shield from both external EMI/RFI ... | 05/01/2007 |
| 7211984 | Start-up and restart of interior permanent magnet machines A method of starting a permanent magnet machine. A machine stator voltage in a stationary reference frame is sensed. An initial speed of a rotor of the machine is estimated based on the sensed voltage, and state variables of control algorithms are initialized based ... | 05/01/2007 |
| 7201010 | Compressor control system for vehicle air conditioner In a compressor control system for a vehicle air conditioner, a hybrid ECU of the vehicle controls a rotation speed of a compressor electric motor. In this case, an output circuit, which outputs a driving signal for driving the compressor electric motor, only needs ... | 04/10/2007 |
| 7202628 | 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... | 04/10/2007 |
| 7199535 | Doubled-ended inverter drive system topology for a hybrid vehicle A double-ended inverter system for a vehicle having a load, a first energy source, and a first inverter system coupled to the first energy source and adapted to drive the load. The double-ended inverter system further having a secondary energy source, a second capac... | 04/03/2007 |
| 7197390 | Electric vehicle with adaptive cruise control system A novel system for adaptively controlling an electric vehicle to maintain desired speed under variable driving conditions. The system includes a control circuit for producing a control signal to control an electric motor of the vehicle. The control signal is formed ... | 03/27/2007 |
| 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 |
| 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 |
| 7187548 | Power converter having improved fluid cooling A thermal support may receive one or more power electronic circuits. The support may aid in removing heat from the circuits through fluid circulating through the support, which may be controlled in a closed-loop manner. Interfacing between circuits, circuit mounting... | 03/06/2007 |
