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| Number | Title | Issue Date |
| 8144439 | Method and circuit for producing rotor position signals and for the commutation of brushless direct-current motors, without using sensors A method and a circuit are provided for the commutation of brushless direct-current motors (BLDC motors), without using sensors, and especially to a method and a circuit for producing rotor position signals, without using sensors, for the commutation of brushless di... | 03/27/2012 |
| 8144438 | Motor control center communication system A motor control center communication system configured to interface with a communication network. The system includes a plurality of motor control units (MCUs), and a MCU controller configured to transmit and receive data signals via the communication network to and... | 03/27/2012 |
| 8125747 | Method for mitigating negative sequence effect resulting from non-symmetrical short circuit failure of synchronous electric machine based systems A drive system for a multi-phase electric machine with a permanent magnet rotor, the drive system may comprise conduction paths for each phase. Detectors on each of the conduction paths may determine electrical condition of the conduction path. At least one selectab... | 02/28/2012 |
| 8089736 | Driving device and protection method thereof A driving device includes a motor, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The first rotating portion is fixed to the rotating shaft. The second rotating portion is e... | 01/03/2012 |
| 8085515 | Electric power source for motor vehicle An electric power source for a motor vehicle is equipped with a welded state discriminator, and while a positive-side contactor and negative-side contactor are controlled to be switched off, the welded state discriminator detects a voltage of a positive-side contact... | 12/27/2011 |
| 8085514 | Modular on-machine controller A modular control assembly is provided for on-machine control of a desired machine. One embodiment has a machine mountable base and a replaceable control unit, wherein the machine mountable base has a machine protection device. In various embodiments of the machine ... | 12/27/2011 |
| 8045301 | Motor drive device When an upper arm of U-phase has failed because of short-circuit, lower arms of V-phase and W-phase as the opposite arms are switching-operated. When only the lower arm of V-phase is turned on, a route of motor current passing through an IGBT element from a V-phase ... | 10/25/2011 |
| 8040643 | Power supply switching apparatus with severe overload detection Power supply switching apparatus comprising an output switch for supplying power from a power supply to a load connected to an output terminal, a driver for controlling turn-on of said output switch, and a control signal generator for controlling said driver to prod... | 10/18/2011 |
| 8031446 | Method of detecting output phase loss for motor driver A method of detecting an output phase loss (OPHL) for a motor drive detects an abnormal OPHL operation when at least one phase of a three-phase current is continually zero. Each phase of the three-phase current is acquired, sampled, filtered, and compared. Hence, a ... | 10/04/2011 |
| 7994747 | Suppressing phased motor voltage transients on disconnect A clamping circuit is included in a phased motor control circuit, particularly on an electrical connection connected to at least one electrostatic discharge cell and/or the driver control electronics of the phased motor control circuit. The clamping circuit triggers... | 08/09/2011 |
| 7948721 | AC motor bypass with fault annunciation, serial communication and fault tolerant coil control A motor bypass is controlled by a digital signal processor (DSP) with embedded control software that allows fault detection and annunciation, serial communications between both a variable frequency drive (VFD) and a bypass controller and the bypass controller and a ... | 05/24/2011 |
| 7944652 | Inverter with protection function A pulse width modulator generates a PWM signal whose duty ratio is feedback-controlled so that a detection voltage according to a current across a secondary coil of a transformer is brought close to a reference voltage. A logic control unit performs a switching cont... | 05/17/2011 |
| 7848066 | Motor drive device and electronic device using the same A motor drive device includes: chopping signal generation means for generating a chopping signal Sa when drive current of a driver has reached a first threshold value; chopping signal cut-off means for cutting off the chopping signal Sa when the drive current has re... | 12/07/2010 |
| 7773351 | Motor control microcomputer and control method for the same An object of the present invention is to improve safety of a motor by instantaneously detecting the abnormality of a PWM signal. To achieve the object, provided is a motor control microcomputer for outputting PWM signals to a motor drive circuit driving a motor, whi... | 08/10/2010 |
| 7733615 | Dynamic braking load analyzer A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being redu... | 06/08/2010 |
| 7701678 | Electric motor control A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The system includes aspects which permit, among other things, electromagnetically disconnecting a failed permanent magnet motor from said system, weight savings in m... | 04/20/2010 |
| 7623326 | Method and device for switching off an inductive load in a failsafe manner A method and a device for switching off an inductive load in a failsafe manner are proposed. According to one aspect of the invention, the method and the device are configured such that a predefined inductive voltage is generated during switch-off. The predefined in... | 11/24/2009 |
| 7609491 | Clothes dryer motor with broken belt switch A clothes dryer includes a motor adapted to be mounted on a frame of the dryer for driving a dryer belt to rotate a drum of the dryer. The motor includes a rotor adapted to rotate the belt, at least one winding energizable to cause rotation of the rotor, and a first... | 10/27/2009 |
| 7606011 | Motor controller with automated input power determination A motor controller automatically determines a motor input power setting based upon manually entered motor output values. The motor controller includes an interface and an input power determining module that determines the motor input power setting from the entered m... | 10/20/2009 |
| 7561386 | Switch monitoring circuit A switch monitoring circuit includes a switch arranged to be turned ON/OFF in response to an operation, a capacitor connected to both ends of the switch, a voltage applying unit that applies a voltage to the switch in response to a command, a voltage detecting unit ... | 07/14/2009 |
| 7558031 | Intelligent automatic bypass for a motor control device An intelligent automatic bypass for a motor control device determines if a fault that is occurring is a restricted or non-restricted fault. A restricted fault is one that may damage or destroy the motor if an automatic switch to bypass is allowed to occur for all fa... | 07/07/2009 |
| 7542251 | Auto-protected power modules and methods A linear power controller system may be implemented that includes locked-rotor protection circuitry that is primarily assembled using analog circuit components. The locked rotor protection circuitry may be part of a power module in the system. The power module may b... | 06/02/2009 |
| 7535684 | Overspeed protection for sensorless electric drives Overspeed protection of sensorless electric drives is needed in the aerospace industry. Methods for overspeed protection may include software implementations, hardware implementations or combinations thereof. Typical high-speed rotating machinery is designed to sust... | 05/19/2009 |
| 7489483 | System and method for look ahead detection of electrical problems at a motor of a vehicle A system for sensing short circuits and open circuits prior to operation of a motor (i.e., while the motor is in a static state), thereby sparing the electrical system from destructive effects of these electrical problems. In addition, the system may detect a short ... | 02/10/2009 |
| 7486489 | System and method for speed control and stall protection combination for electric motors such as in engine cooling applications A speed control and stall protection system 10 for an electric DC brush motor includes a DC brush motor M. At least one relay K3 is connected between the motor and a power supply. A speed sensing circuit 20 is constructed and arranged to generat... | 02/03/2009 |
| 7477493 | Alternator control device for vehicle A vehicle alternator control device in which, when a signal detection portion detects a determined input signal, an operating mode of an overvoltage warning portion is switched to a detection operating mode by an overvoltage warning operating mode switching portion.... | 01/13/2009 |
| 7446989 | Device for protection of the bearing of an electrical machine against damaging passage of current A device for protecting the bearing of an electrical machine against the damaging passage of current, wherein the electrical machine comprises a stator and a rotor pivotally mounted relative to the stator by the bearing. The device is provided with a compensation ci... | 11/04/2008 |
| 7443642 | Electric motor control A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The system includes aspects which permit, among other things, electromagnetically disconnecting a failed permanent magnet motor from said system, weight savings in m... | 10/28/2008 |
| 7433164 | Ceiling fan motor control module A ceiling fan motor control module includes a digital core controller coupled to a brushless motor for computing, processing, transmitting and controlling signals and providing a soft start and stop function, a back stage output device for receiving signals from the... | 10/07/2008 |
| 7425805 | Three-in-one control device for a ceiling fan A three-in-one control device for a ceiling fan includes a signal receiving module, which is able to receive segmented controlled signals, stepless controlled signals and wireless controlled signals respectively, for transmitting controlled signals to a micro comput... | 09/16/2008 |
| 7426099 | Controller method, apparatus and article suitable for electric drive A control system, method and article allows a monitoring module to monitor operation of a main controller in an electric drive, by providing questions and evaluating the accuracy and/or timeliness of responses from the main controller. Upon detection of an excessive... | 09/16/2008 |
| 7417388 | Running machine with wheels A running machine that can prevent overturning of a body in the case of occurrence of an abnormality is provided. The running machine substantially supports the body with coaxially arranged drive wheels, and can drive while maintaining the balance of the body. A con... | 08/26/2008 |
| 7400104 | Voltage converting device, computer readable recording medium with program recorded thereon for causing computer to execute failure processing, and failure processing method A control device detects whether or not an up-converter fails, based on a DC voltage from a voltage sensor, an output voltage from a voltage sensor, and a duty ratio in controlling switching of NPN transistors. If a failure in the up-converter is detected, the contr... | 07/15/2008 |
| 7397222 | On-line testable solid state reversing DC motor starter A solid state reversing DC motor starter that is testable on-line and satisfies the requirements for nuclear safety grade equipment. The motor starter employs a bridge of solid state switches which connect the polarity of the motor winding to conform to the desired ... | 07/08/2008 |
| 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 |
| 7385795 | Cordless power tool with a protected weak link element A method consistent with an embodiment may include selecting one of a plurality of components of a power supply system of a cordless power tool to be a protected weak link element. The method may also include configuring the protected weak link element to fail from ... | 06/10/2008 |
| 7383133 | Diffuse seismic imaging systems and methods Systems and methods are disclosed to construct subsurface images from diffuse seismic energy. Various disclosed system embodiments include multiple seismic sensors that each convert received seismic energy into one or more seismic signals. One or more processor comb... | 06/03/2008 |
| 7375934 | Power converter controlling apparatus and method applying a fault protection scheme in a motor drive system A method and apparatus control a power converter (20) of a motor drive system. The power converter (20) is controlled during a first operating mode by applying a current control scheme, which sets power converter commands to control active and reactive... | 05/20/2008 |
| 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 |
| 7372686 | Power supply apparatus capable of detecting abnormality in current flowing in drive circuit A current detection unit samples motor current at every cycle corresponding to a cycle of the highest processing speed of a CPU. A current integral calculation unit integrates the value of the sampled motor current over a sampling period to calculate and output a cu... | 05/13/2008 |
