Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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 |
| 8174220 | Apparatus for controlling permanent-magnet rotary electric machine Apparatus controlling a permanent magnet rotary electric machine. After the apparatus controls a current control portion, when a rotor of the machine rotates at a constant speed, to supply a predetermined current to an armature, the apparatus performs a dq vector co... | 05/08/2012 |
| 8134322 | Motor control apparatus In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting pe... | 03/13/2012 |
| 8030870 | Method and device for reducing the influence of a DC component in a load current of an asynchronous three-phase motor A method for reducing the influence of a DC component in a load current of an asynchronous three-phase motor, in which the voltages of two of the three phases are controlled by adjusting firing angles of semiconductor devices of the type turning-off at zero-crossing... | 10/04/2011 |
| 7969109 | Electrical actuator An electric actuator includes a motion conversion mechanism and a position detector. The motion conversion mechanism converts rotation of a rotary shaft of a motor into linear motion of an output shaft. The position detector detects a permanent magnet M, which moves... | 06/28/2011 |
| 7804264 | Commutation method and apparatus for a DC to AC inverter driving a three-phase asynchronous AC motor Present invention belongs to the field of inventers, motor controllers and pulse modulated waveform generation methods and circuits. More specifically it belongs to such methods and circuits utilizing fundamental vectors. This invention features better and more effi... | 09/28/2010 |
| 7768221 | Method, system, and apparatus for controlling an electric motor The present invention provides systems and methods for power factor control of a motor. A phase detector uses a line voltage of a power supply and a motor terminal voltage of a motor. The output of the phase detector is synchronized to a zero crossing of the motor c... | 08/03/2010 |
| 7755314 | Electric-motor-equipped vehicle An electric-motor-equipped vehicle of the present invention includes an electric motor which receives a power supply from a storage apparatus and drives the vehicle, or assists a driving of the vehicle by an internal combustion engine. The electric motor includes: a... | 07/13/2010 |
| 7679303 | Evaluation device and method for rotary drive, corrective manipulated variable setting device and method, control device and method, and program An evaluation device for a rotary drive that evaluates periodic velocity fluctuation of the rotary drive is provided. The evaluation device includes a rotational velocity fluctuation detector, a reference signal generator, and a multiplier-accumulator. The rotationa... | 03/16/2010 |
| 7436139 | Phase advance angle optimization for brushless motor control A control system for a multiphase permanent magnet motor having a controller for producing a control signal to energize each phase winding. The controller includes a current value calculator for determining a value of phase current advanced in phase with respect to ... | 10/14/2008 |
| 7420345 | Circuit for driving an appliance for treating laundry A circuit for driving an appliance for treating laundry, includes a motor circuit having an AC motor, and a door-locking circuit. The motor circuit and the door-locking circuit may be driven by a single common electronic switching element. ... | 09/02/2008 |
| 7345443 | Motor control apparatus It is an object of the invention to provide a motor control apparatus capable of ensuring a control function even for a large inertia moment ratio. In a motor control apparatus including a position detecting portion (1B) of a motor (18) for driv... | 03/18/2008 |
| 7342372 | Method for power control of an electric motor The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternatin... | 03/11/2008 |
| 7342366 | Controller for brushless motor The controller for a brushless motor controls motor current by executing updates of applied voltage to a coil in accordance with rotational position of a rotor, the target current, and the actual current flowing through the coil. The updates of applied voltage to th... | 03/11/2008 |
| 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 |
| 7279857 | System, method, and computer-readable medium for reduction of commutation-related acoustic noise in a fan system A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for contro... | 10/09/2007 |
| 7271558 | Method for the generation of electrical pulses In rotating systems with angular references, angular- and/or time-based pulses must be generated which can be described in a generic manner to meet various requirements. The parameters for definition of the pulse are assigned as a value pair to permit more flexibili... | 09/18/2007 |
| 7268503 | Vibration linear actuating device, method of driving the same device, and portable information apparatus using the same device A vibration linear actuating device includes a vibrating linear actuator and a driver (52) for driving actuator. Actuator includes mover having permanent magnet magnetized in a radial direction, stator having coil (2) and facing the permanent magnet, a... | 09/11/2007 |
| 7262568 | Brushless DC motor coupled directly to AC source and electric apparatus using the same motor A brushless DC motor is disclosed, in which a commercial AC source is full-wave rectified by a rectifier and then converted into a generally flat and low DC voltage not more than 45V by a DC voltage converter. The low DC voltage is applied in a full-wave driving met... | 08/28/2007 |
| 7253575 | Industrial optical shutter A highly versatile optical shutter for industrial and scientific applications is disclosed. The has a aperture which defines a light path through the shutter, and a shutter vane or blade that is moved into and out of the light path using a precision, microprocessor ... | 08/07/2007 |
| 7245096 | Method and apparatus for controlling the speed of a DC motor A method and apparatus for controlling the speed of a DC electric motor receives a periodic commutation signal having a fixed duration on cycle and an off cycle. The commutation signal then is modified to form a periodic modified commutation signal having substantia... | 07/17/2007 |
| 7230399 | Vehicular generator-motor system A vehicular generator-motor 1 is composed of a rotor, a stator having three phase armature winding 2, and a converter 4. The rotor is provided with a field winding 3 for magnetizing a plurality of magnetic pole pieces 14a... | 06/12/2007 |
| 7221116 | Motor control apparatus In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting pe... | 05/22/2007 |
| 7218073 | Fan motor speed control circuit A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The ... | 05/15/2007 |
| 7208897 | Motion control system for barrier drive A system for operating a barrier system such as a garage door, gate or fence. A DC motor is connected to and operates a barrier drive. A power amplifier is configured to receive power signals from a power supply and to output modulated DC signals to the DC motor. A ... | 04/24/2007 |
| 7202622 | Method for controlling an electric motor to reduce EMI A method for reducing EMI emissions in the control of an electric motor supplied by a switching inverter fed by a DC bus comprising controlling a phase advance of a conduction angle period during which a phase of the motor is fed power by the inverter to control the... | 04/10/2007 |
| 7202616 | Synchronous control method and device of the same A synchronous control device which is provided with drive motors and a central control unit generating a synchronous reference signal and with which the drive motor is controlled to rotate synchronously with the synchronous reference signal supplied from the central... | 04/10/2007 |
| 7202572 | Generator/motor system and method of operating said system A generator/motor system and a method for operating this generator/motor system with which the filter currents are reduced. The generator/motor system has, for this purpose, a rotational field machine (DM) and a pulse-controlled inverter and filter capacitors (C1... | 04/10/2007 |
| 7196485 | Universal low-power ceiling fan controller A universal low-power ceiling fan controller includes a brushless DC motor in a ceiling fan casing, a microprocessor connected to a power supply that operates with a remote-control device and has a transmitter and a receiver for transmitting data signals to the micr... | 03/27/2007 |
| 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 |
| 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 |
| 7190135 | Method of inverter linearization in electric machines through secondary modulation A method for implementing control signal linearization for an electric motor is disclosed. In an exemplary embodiment, the method includes receiving a desired voltage command to be applied to the motor and determining whether the magnitude of the desired voltage com... | 03/13/2007 |
| 7190145 | Method and apparatus for improving speed measurement quality in multi-pole machines A method and apparatus for improving speed measurement quality in systems having multi-pole machines is taught. The method compensates for pole misalignment by computing speed based upon moving average techniques. In one embodiment, a moving average speed averaged o... | 03/13/2007 |
| 7187153 | Motor-driven power steering apparatus In a motor-driven power steering apparatus, a plurality of rotational position detecting sensors are provided in an electric motor, and during an abnormality in any one rotational sensor, the electric motor can be driven by using a detected result of any other one r... | 03/06/2007 |
| 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 |
| 7180262 | Control system and method for electric drives with a.c. motors A vector-control system and method of a “sensorless” type for electric drives with a.c. motors is based upon generation of an oscillating magnetic field and upon measurement of the deviation, with respect to said oscillating field, of the flux generated thereby ... | 02/20/2007 |
| 7171715 | Full automatic washing machine and method for controlling the same Full automatic washing machine, and method for controlling the same, the full automatic washing machine including a spinning tub 2 movably fitted in an outer tub 1, a pulsator 3 rotatably fitted in the spinning tub 2 to be rotatable indep... | 02/06/2007 |
| 7161317 | Electromotive power steering controller An objective is to provide a specific realization means for easily determining malfunction of a system in an electromotive power steering controller. The electromotive power steering controller includes: a voltage controller for controlling voltage applying to a mot... | 01/09/2007 |
| 7157870 | Drive method for brushless motor and drive control apparatus therefor A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by motor current control means (74 in FIG. 2) in accordance with the deviation between a target motor current value and an actual mo... | 01/02/2007 |
| 7148641 | Direct current and alternating current motor and generator utilizing a periodic transformation system In an AC or DC motor operation and power generation system, a periodic transformation system reduces or prevents harmonic distortion, reduces resistance or impedance, and improves energy efficiency in a signal either consumed, such as in a motor, or produced, such a... | 12/12/2006 |
| 7148651 | Apparatus and method for controlling AC motor and module therefor A method and apparatus for controlling a permanent magnet synchronous motor by accurately detecting 3-phase motor currents from a DC input current in a full voltage range are provided. In the motor control apparatus for detecting the 3-phase motor currents on the ba... | 12/12/2006 |
