Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8013556 | Motor control device and vehicle including the same A current instruction generation unit generates a d-axis current instruction and a q-axis current instruction based on a torque instruction for an AC motor, using a map in which a current instruction capable of lowering noise (vibration and sound noise) (low-noise c... | 09/06/2011 |
| 7504791 | Electric power tool with optimized operating range The invention relates to an electric power tool (1), having an electric motor (8) that serves to drive a tool (6). The electric power tool (1) is characterized in that a sensor unit (9) that detects the contact pressure of the tool... | 03/17/2009 |
| 7477033 | Rotation drive system having a speed reduction device with elastic bodies An input shaft speed signal for rotating a motor at a predetermined rotational speed is output from a rotation control unit to the motor. A rotational speed reduced by a speed reduction device with elastic bodies is detected by an output rotation sensor. A CPU obtai... | 01/13/2009 |
| 7453224 | Sensing mechanical transitions from current of motor driving hydraulic pump or other mechanism A circuit and method for detecting an operating transition of a mechanical apparatus driven by a hydraulic prime mover comprising a hydraulic pump driven by an electric motor, the operating transition causing a change in the force applied by the mechanical apparatus... | 11/18/2008 |
| 7423393 | Car control method and car control apparatus A car control apparatus including a wheel sensor, wheel torque calculating means for calculating wheel torque from the wheel speed, drive force detecting means for detecting drive force generated by an electric motor, car body drive force calculating means for calcu... | 09/09/2008 |
| 7417393 | Load driver capable of suppressing overcurrent A control device determines whether a motor generator is controlled in a PWM control mode, an overmodulation control mode or a rectangular-wave control mode. If a command to perform a boosting operation by a voltage step-up converter is issued while the motor genera... | 08/26/2008 |
| 7414377 | System and method for automatic current limit control A motor controller system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A sensor senses AC line voltage. A control circuit controls operation of the solid state switches. Th... | 08/19/2008 |
| 7402970 | Electric power steering device The present invention includes a control part for controlling switching elements on diagonal lines in the upper and lower stage of an H bridge circuit respectively by different duty ratios based on a steering torque exerted on a steering system, and an electric powe... | 07/22/2008 |
| 7388342 | System and method for controlling a motor using forced speed control A system and method for operating a motor drive unit. The motor drive unit is coupled to a motor driving a load and is configured to selectively control the motor according to a torque control mode and a speed control mode. The motor drive unit includes a circuit co... | 06/17/2008 |
| 7370468 | Turbojet electromechanical thrust reverser with servo-controlled door displacement A turbojet thrust reverser includes two doors each displaceable between an open position and a closed position of the reverser by at least one respective control actuator. Two electric motors drive the control actuators for the doors; each motor being controlled by ... | 05/13/2008 |
| 7362068 | Closing member control system A controller reduces an output of the drive motor when a window glass reaches a speed shift position, which is between a fully open position and a fully closed position of the window glass, in a closing operation of the window glass. The controller increases the out... | 04/22/2008 |
| 7352545 | Compressor terminal fault interruption method and apparatus A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputti... | 04/01/2008 |
| 7342370 | Electronic control system with torque and/or speed boost for motor vehicle seats A motor vehicle seat adjuster includes a DC motor and a control system operably connected to the motor to control seat motion to a desired motion profile. Power to the motor is variable from less than 100% of normal power to greater than 100% of normal power. The de... | 03/11/2008 |
| 7342371 | System and method for detecting motor run condition A motor control system for detecting motor run condition comprises power switches for connection to an AC line for controlling application of AC power to the motor. An input receives a motor start command. A controller is connected to the input and controls operatio... | 03/11/2008 |
| 7339336 | Movable barrier operator auto-force setting method and apparatus A method is provided for use with a movable barrier operator that has no user-initiable dedicated learning mode of operation. At least one parameter is monitored that corresponds to force as applied to a movable barrier to selectively cause the movable barrier to mo... | 03/04/2008 |
| 7339337 | Power plant A propeller is driven by an electric motor through a mechanical drive train. The output torque of the motor to the drive train is controlled by a controller with respect to a normal torque reference signal and an emergency torque reference signal. When a measured de... | 03/04/2008 |
| 7327104 | Control apparatus for electrically-powered vehicle A control apparatus for an electrically-powered vehicle that includes an electrical motor, a motor control unit, and a traction control unit that controls a drive force so as to suppress spinning of driving wheels based on an operation request, includes: a driver re... | 02/05/2008 |
| 7318485 | Method of Controlling the direction of rotation of a power tool The invention discloses a power tool for screwing or drilling having a motor for driving a drive shaft, a controller for controlling the power tool, a motor switch for switching the motor on and off, switch for reversing the power tool between clockwise and counter-... | 01/15/2008 |
| 7304452 | Motor control device A motor control device for controlling a permanent magnet motor includes a current detector detecting current flowing through three-phase windings, an induced voltage computing unit obtaining voltage induced at each phase from the detected three-phase winding curren... | 12/04/2007 |
| 7294988 | Synchronous motor drive unit and a driving method thereof A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its star... | 11/13/2007 |
| 7271559 | Method and switching apparatus for recording the current in an electrical device A system and method for measuring the electrical current used by an electrical device and controlled according to the Pulse Width Modulation (PWM) method, such as a DC motor, the system using a Field Effect Transistor (FET) coupled to the electrical device such that... | 09/18/2007 |
| 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 |
| 7258648 | Model-based control for torque biasing system A power transmission device equipped with a torque biasing system and control system for controlling the torque biasing system is operable to determine a torque command and calculate a torque error based on the torque command and a model-based torque. A control sign... | 08/21/2007 |
| 7259533 | Method of controlling motor drive speed Disclosed is a method of controlling drive speed of a motor operating in overload conditions. The method includes the steps of: driving the motor at a predetermined reference speed; detecting phase voltage and phase current applied to the motor; determining whether ... | 08/21/2007 |
| 7248009 | Motor temperature control using estimated motor temperature based on motor power dissipation A system and method of controlling motor temperature is based on computed motor power dissipation and a thermal model of the motor, rather than a measured motor temperature, in a control loop that limits the motor drive to prevent overheating. An ambient temperature... | 07/24/2007 |
| 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 |
| 7236907 | Steering angle sensor assembly with pulse width modulated output signal A steering angle sensing system includes at least one steering angle sensing device for outputting an analog signal representative of a steering angle position of a steering wheel. A first processor is operably coupled to the at least one steering angle sensing devi... | 06/26/2007 |
| 7234564 | Haptic controller for road vehicles An electric assisted steering system for a motor driven road vehicle, having assist torque signal generating means which generates an assist torque signal for the steering system in response to the driver's applied torque and sensed vehicle speed to reduce the drive... | 06/26/2007 |
| 7234536 | Power screwdriver A power screwdriver is disclosed having a drive which is coupled via a clutch, disengaging as a function of torque, to a tool drive shaft for driving a tool. The screwdriver comprises an electronic control unit for controlling the drive, and a sensor which is couple... | 06/26/2007 |
| 7235946 | Actuator current control method The present invention relates to an actuator current control method. The method of the present invention comprising the steps of measuring a feedback current passing through an actuator, determining PWM duty according to an error component between a target current p... | 06/26/2007 |
| 7227324 | Parking brake and method for controlling the same A method for controlling an electrically actuable parking brake is described. In this method the cutoff current of the electric motor is varied to compensate for example for changes in the application force associated with aging or wear or for changes in the applica... | 06/05/2007 |
| 7208893 | Motor driving control device to be driven at interval of constant time A motor driving control device includes a motor, a switch unit that controls driving of the motor, a current detection resistor that outputs a detection voltage indicating a current of the motor, a comparator that compares the detection voltage with a target current... | 04/24/2007 |
| 7208896 | Electric jack load balancing method and device An electric jack load balancing method and device for reducing the difference in load carried by each jack of a pair of electric jacks while adjusting the attitude of a platform. The device includes a controller configured to reduce the difference in load carried by... | 04/24/2007 |
| 7205737 | Systems and methods of monitoring a motor load Systems and methods of detecting an overload condition. In one embodiment, a method of monitoring a load of a DC motor includes intermittently de-energizing the motor; monitoring a first voltage; and measuring a first interval of time between a starting time and an ... | 04/17/2007 |
| 7200472 | Control device and method for fuel cell powered vehicle A system controller 100 controlling an electric power generation system of a fuel cell powered vehicle realizes functions as a fuel-cell power-generation response time estimation section 101, by which power-generation response time of a fuel cell 1 | 04/03/2007 |
| 7199534 | Electric jack stroke limit detection method and device A method and device for detecting the stroke limit of an electric motor-driven jack while the jack is being used to adjust the attitude of a mobile platform. A controller is programmed to detect when an electric jack motor has driven a jack to a jack stroke limit by... | 04/03/2007 |
| 7193381 | Electric jack ground contact detection method and device An electric jack ground contact detection method and device for detecting ground contact of an electric motor-driven jack as the jack is being extended to adjust the attitude of a mobile platform. The device includes a controller that monitors the electrical power d... | 03/20/2007 |
| 7191608 | Cooling apparatus There is provided a cooling apparatus which can prevent an abnormal increase in pressure of a high side at the time of starting. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; and a control device which controls a ... | 03/20/2007 |
| 7193385 | Digital control of motor drives A digital controller is easily implemented for variable speed or torque control of an electric motor or generator by using a comparator to determine a choice of control state outputs. ... | 03/20/2007 |
| 7187145 | Motor controller Control parameters can be easily and precisely adjusted, the response of a motor controller can be highly accurately made at high speed and a vibration can be suppressed to a low level. Even when an inertia is varied during an operation or a viscous friction ... | 03/06/2007 |
