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| Number | Title | Issue Date |
| 8159792 | Motor control device In a motor control device that drives a plurality of motors with one DC power supply, detection of a short circuit fault occurring in the motors is realized with an inexpensive configuration. In order to drive the plurality of motors (105, 106), a current det... | 04/17/2012 |
| 8035934 | Shift switching device and shift switching method A shift-by-wire shift switching device and shift switching method that switch a shift range of an automatic transmission using an electric motor. The shift switching device includes a controller that determines whether a fault has occurred in a current supply line o... | 10/11/2011 |
| 8018695 | Fuel pump control apparatus A control apparatus for controlling a fuel pump includes: an electronic switch provided in a circuit for connecting a power supply to a motor for driving the fuel pump; a current detector which detects a current which flows through the motor; and a controller which ... | 09/13/2011 |
| 8014110 | Variable speed drive with integral bypass contactor Systems and methods for operating a variable speed drive to receive an input AC power at a fixed AC input voltage and frequency and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter stage to conver... | 09/06/2011 |
| 7843671 | Electric machine control system A drive system for an electrical machine is provided. The system includes a control unit and a monitoring unit, which is independent of the control unit. The control unit includes a device that converts one or more incoming operating parameters of the electrical mac... | 11/30/2010 |
| 7813089 | Motor controller and electric power steering apparatus In a motor controller, if a failed electric current flow in any one of phases of a motor is detected, a motor control signal is generated, based on a phase other than the phase with the failed electric current flow, in such a manner that a motor electric current mat... | 10/12/2010 |
| 7768750 | Cordless power tool To provide a cordless power tool which can suppress heat generation of a protection unit and prevent the erroneous operation. A cordless power tool 1 includes a body casing 10; a battery 20 which is detachably attached to the body casing 10 | 08/03/2010 |
| 7733616 | Abnormality detecting device of electric power converting device and abnormality detecting method Each of three-phase arm of an inverter has first and second switching elements connected in series together at a connection point to the corresponding phase coil of the three-phase motor. Control device turns on the first switching element of the i-th (i is a natura... | 06/08/2010 |
| 7623328 | Driving control apparatus for motion mechanism and control method of driving control apparatus When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also a control signal to the drive circuit is cleared. ... | 11/24/2009 |
| 7589942 | MEMS based motor starter with motor failure detection A motor starter is disclosed. The motor starter includes control circuitry integrally arranged with at least one current path and a processor included in the control circuitry. The motor starter further includes at least one processor algorithm residing on the proce... | 09/15/2009 |
| 7545613 | Method of controlling seatbelt retracting device with motor In controlling a seatbelt retracting device having a mechanism for retracting a seatbelt with a motor, a current flowing to the motor is detected, and a rate of increase in the current is calculated. The motor is stopped when the rate of increase in the electricity ... | 06/09/2009 |
| 7508637 | Antilock system for a permanently excited electric motor drive As an antilock system for a permanently excited electric motor drive, especially for a steering booster servo drive of a motor vehicle, in the event of a winding short-circuit, an interruption of at least one winding phase (MP1 or MP2 or MP3) of... | 03/24/2009 |
| 7463464 | Method and apparatus for sensing brushless DC motor average current from overcurrent protection circuitry A method and an apparatus that permit the measurement of the motor average current directly from the output of the amplifier and filter stage used for instantaneous dc-link overcurrent protection. As such, only one amplifier and filter stage is sufficient to provide... | 12/09/2008 |
| 7450355 | Power supply apparatus with function of detecting abnormality of current sensor A current detector (60) samples a motor current (MCRT_A) from a controlling sensor and a motor current (MCRT_B) from a monitoring sensor, and holds respective motor current maximum values (MCRT_Amax, MCRT_Bmax) at each prescribed operation cycle. An abnormali... | 11/11/2008 |
| 7403360 | Central vacuum cleaning system control subsystems A central vacuum cleaning system control subsystem for use in a central vacuum cleaning system having a motor includes a central vacuum unit control module with a receiver for wirelessly receiving command signals, and a power stage for controlling the motor in accor... | 07/22/2008 |
| 7394629 | Motor overload tripping system and method with multi-function circuit interrupter A technique is provided for controlling operation of motors of different sized or ratings. Components used to apply and interrupt current to the motors may be shared in control devices for the different motors. The components may include contactors or circuit interr... | 07/01/2008 |
| 7372676 | Motor coil-shorting detecting unit In order to be acceptable for safety critical applications, it is necessary for an electrical machine to allow continued operation despite an electrical short circuit in one of the operational phases of that electrical machine. It will be appreciated that an electri... | 05/13/2008 |
| 7372677 | Control apparatus for internal combustion engine-driven vehicle having power supply unit A control apparatus for an internal combustion engine-driven vehicle equipped with a power supply unit having an AC generator driven by an internal combustion engine, and a power converter which converts an output voltage from the AC generator into an AC voltage of ... | 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 |
| 7354028 | Method for controlling application of brakes in single drum hoist systems A method of damping the oscillations during an emergency stop of an ascending single drum hoist system in a shaft having a conveyance, the mechanical brakes applying a braking force to the drum and the drum rotating in a first direction having a speed, comprising ap... | 04/08/2008 |
| 7355826 | Power supply apparatus capable of detecting abnormality of current flowing through drive circuit A current detection unit starts sampling of a motor current at the timing when the motor current has exceeded a threshold value, and holds a maximum motor current value for each prescribed operation cycle. An abnormality determination unit determines whether the max... | 04/08/2008 |
| 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 |
| 7352546 | Motor overcurrent protection device A motor overcurrent protection device connectable to a motor. The motor has a rotary shaft and a controlling port. The motor overcurrent protection device includes a sensing unit, a driving unit and a controlling unit. The sensing unit includes a magnetic block arra... | 04/01/2008 |
| 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 |
| 7342276 | Method and apparatus utilizing monocrystalline insulator A semiconductor device, including: a semiconductor material; a conductive element; and a substantially monocrystalline insulator disposed between the semiconductor material and the conductive eleme... | 03/11/2008 |
| 7339424 | Apparatus and method for controlling temperature of electronic apparatus In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downwar... | 03/04/2008 |
| 7336047 | Motor vehicle steering system A motor vehicle steering system includes a motor driving circuit connected between a power supply and a ground for driving a multi-phase motor, PWM signal generating unit for generating an each-phase PWM signal for controlling a current flowing through each of phase... | 02/26/2008 |
| 7336455 | System and method for proactive motor wellness diagnosis The present invention is directed to a power meter or overload relay including a housing and a plurality of sensors configured to monitor operation of a motor. A processor disposed within the housing and configured to receive operational feedback from the plurality ... | 02/26/2008 |
| 7336456 | Control-motor system An objective is to detect a resolver malfunction without fail, using a low-cost resolver having the small number of the poles, and a control-motor system having advantage in small sizing and high-power outputting. In the control-motor system, the system for driving ... | 02/26/2008 |
| 7327545 | Electric generation control device of electric generator for vehicle An electric generation control device detects the occurrence of a failure such as a short circuit failure and an open failure in one of a pair of power transistors, which form a H bridge circuit composed of excitation switching elements and regeneration switching el... | 02/05/2008 |
| 7318483 | Fire fighting foam injection system with auto-start feature A fire fighting vehicle of the type having a system for introducing a liquid foam concentrate into a water delivery hose so that the percentage concentration of foamant in the mixture remains at a predetermined set value irrespective of variations in the water flow ... | 01/15/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7309968 | Motor control circuit and associated full bridge switching arrangement A motor control circuit for controlling a motor, the circuit comprising a switched mode power supply operable to drive a full bridge switching transistor arrangement and to provide a stable voltage to the motor control circuit, wherein the switching transistor arran... | 12/18/2007 |
| 7307676 | Liquid crystal display module A liquid crystal display module arranged to improve brightness and light efficiency of a direct-below-type back light unit. The liquid crystal display module includes a plurality of lamps; a reflection plate arranged to accommodate the plurality of lamps; a pluralit... | 12/11/2007 |
| 7301737 | Motor power line break detection method in AC servo driver An object of the invention is to provide a break detection method capable of lessening a delay of motor power line break detection. According to the invention, in a motor power line break detection method of an AC servo driver including a current detector and... | 11/27/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7287892 | Light source for back-lit displays A light source having a light pipe and a light generation section. The light pipe includes a two-dimensional sheet of transparent material having a transparent top surface that is substantially parallel to a reflective bottom surface. The light pipe includes light p... | 10/30/2007 |
| 7275851 | Radiating member, illuminating device, electro-optical device, and electronic device A radiating member, an illuminating device, an electro-optical device, and an electronic device are provided which are capable of absorbing the heat generated from an LED, thereby increasing the amount of electric current flowable through the LED. More particularly,... | 10/02/2007 |
| 7276871 | System and method for fault protection for permanent magnet machines A fault protection system and method of fault protection for permanent magnet machine (PMM)-based systems that utilize machine neutral decoupling (MND) to shut down a shorted winding and/or to isolate a short-circuit fault to prevent damage to a permanent magnet mac... | 10/02/2007 |
| 7277304 | Multiple inverter system with single controller and related operating method A multiple DC-to-AC inverter system, which is suitable for an electric or hybrid vehicle application, includes a plurality of inverters controlled by a single controller. One example embodiment includes four three-phase inverters driving one six-phase motor, where t... | 10/02/2007 |
