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| Number | Title | Issue Date |
| 7852105 | Winding diagnostic system and method A winding diagnostic system is provided. The system includes a core having a winding to generate a magnetic flux. A retention device for holding the winding in place is provided. The system further includes a sensor disposed in a sensing relation with the retention ... | 12/14/2010 |
| 7847579 | Systems and methods to evaluate permanent magnet motors Methods and systems for evaluating a permanent magnet motor are provided. The method includes the steps of spinning a rotor of the permanent magnet motor; determining a total harmonic distortion of the permanent magnet motor; and comparing the determined total harmo... | 12/07/2010 |
| 7847580 | System and method for motor fault detection using stator current noise cancellation A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor pro... | 12/07/2010 |
| 7795898 | Fan having function for detecting fault in the fan A fan having a function for detecting a fault such as a breakage or a loss of a rotating part of the fan as well as reduction in the rotational speed of the fan, the function being not affected by an operating condition of the fan. The fan includes a stationary part... | 09/14/2010 |
| 7777516 | System and method for bearing fault detection using stator current noise cancellation A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor pro... | 08/17/2010 |
| 7772870 | Method and apparatus for layer short detection of electric rotating machine There is provided a detector for detecting a layer short of a field winding in operation by measuring, with a field detector, a magnetic field generated from a field winding of an electric rotating machine. In the present invention, a field detector is installed out... | 08/10/2010 |
| 7759966 | Methods and systems for evaluating permanent magnet motors A method for evaluating a permanent magnet motor, which includes a rotor with a plurality of magnets mounted thereon, and a stator with a plurality of windings in proximity to the rotor and coupled to an inverter, includes spinning the motor such that a voltage is i... | 07/20/2010 |
| 7759965 | Systems and methods to evaluate permanent magnet motors Methods and systems for evaluating a permanent magnet motor are provided. The method includes the steps of spinning a rotor of the permanent magnet motor; determining a total harmonic distortion of the permanent magnet motor; and comparing the determined total harmo... | 07/20/2010 |
| 7750663 | Method and apparatus for testing an electronic motor An apparatus for testing an electric motor is described. The motor comprises stator windings and a rotor arranged along a rotation axis. The apparatus is adapted to measure a physical quantity of the stator winding while the rotor is being rotated about the rotation... | 07/06/2010 |
| 7705623 | Method and device for detecting interlaminar short circuits A method for determining a short circuit between at least two stator laminates in an electrical machine having a rotor mounted on a shaft and a stator, includes rotating the rotor on the shaft relative to the stator so to pass a magnetic stator flux, varying over ti... | 04/27/2010 |
| 7649378 | Methods for evaluating permanent magnet motors after manufacture and during service A method evaluates a motor assembly having a first permanent magnet motor in a transmission of an automotive drive system at an end of manufacturing line evaluation. The first motor includes a first rotor with a first plurality of magnets mounted thereon, and a firs... | 01/19/2010 |
| 7642806 | Test apparatus, system, and method with a magnetic feature A magnetic test apparatus, in accordance with one embodiment, comprising a rotor coupled to a drive shaft, wherein the drive shaft is mechanically coupled to a drive system; a stator coupled to at least one brush holder; at least one brush held by the brush holder, ... | 01/05/2010 |
| 7616023 | Method of detecting a malfunction of an encoder for a vehicle drive system A method of detecting a malfunction of an encoder used in a vehicle drive system includes determining an error of a motor speed based on an estimated motor speed, wherein the estimated motor speed is a function of measured current over a predetermined interval of ti... | 11/10/2009 |
| 7612576 | Method for detecting an inverter hardware failure in an electric power train In a method for detecting an inverter hardware failure in an electric power train comprising high voltage cables, at least one electric machine and at least two inverter legs with two power electronic switches respectively for pulse-width-modulating a DC voltage fro... | 11/03/2009 |
| 7570074 | Electronic overload relay for mains-fed induction motors An induction motor having a rotor and a stator is protected during running overloads by connecting the motor to an overload protection relay that can be tripped to interrupt power to the motor in the event of an overload, tracking the stator winding temperature of t... | 08/04/2009 |
| 7545163 | Three phase motor diagnostics and phase voltage feedback utilizing a single A/D input A motor system utilizes a single feedback output to determine various fault states for a 3-phase motor in a non-operational condition. The same single feedback output may be used to determine the applied phase voltage for a 3-phase motor in an operational condition.... | 06/09/2009 |
| 7538571 | Starter zero current test apparatus and method An alternator and starter tester system having a starter current zero test. The current is measured before and after a solenoid of a starter motor is energized and deenergized to determine if the starter motor should be failed. This allows the operator to quickly de... | 05/26/2009 |
| 7414425 | Damping control in a three-phase motor with a single current sensor While a PWM-controlled, FET-switched three-phase motor is operating in a mechanical damping mode, a single current sensor is used to measure current in the motor. When mechanical feedback into the motor exceeds a predetermined threshold, a bank of the FET switches c... | 08/19/2008 |
| 7411404 | Apparatus, system, and method for detecting an electrical short condition in a dynamoelectric machine A system, apparatus, and method (10) for detecting an electrical short condition in a dynamoelectric machine are described. The method includes determining an operating parameter of a dynamoelectric machine (14) responsive to at least one output signal... | 08/12/2008 |
| 7382138 | System and method for non-destructive testing of rotors A method is provided for testing an electrical characteristic of a rotor. In one embodiment, the method may include applying current to the rotor, measuring voltage drop between first and second positions on the rotor, and evaluating the electrical characteristic of... | 06/03/2008 |
| 7382150 | Sensitivity switchable detection circuit and method A sensitivity switchable detection circuit includes a high gain circuit for outputting a first signal, a low gain circuit for outputting a second signal, and an output switching circuit for switching between the first signal and the second signal. When the first sig... | 06/03/2008 |
| 7372233 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a ... | 05/13/2008 |
| 7372227 | Apparatus for braking a synchronous machine A method is proposed for braking a synchronous machine 1, with the armature windings (u, v, w) of the synchronous machine 1 being short-circuited, optionally by interposing at least one braking resistor. In order to keep the braking moment constant ove... | 05/13/2008 |
| 7363175 | Query based electronic battery tester An electronic battery tester for testing a storage battery provides a test output indicative of a condition of the battery. Electronic measurement circuitry provides a measurement output related to a condition of the battery. The battery condition is determined base... | 04/22/2008 |
| 7355436 | Method for error detection in a drive mechanism A method for error detection in a drive mechanism, having a multiphase electric motor and a converter connected upstream thereof, wherein the converter controls voltages of individual phases of the electric motor, and individual phase currents in the individual phas... | 04/08/2008 |
| 7352145 | Voltage-sensitive oscillator frequency for rotor position detection scheme A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry.... | 04/01/2008 |
| 7342369 | Differential ripple detection method and system Method and system of monitoring operations of an electric motor. The method and system being applicable to any number of motors of the type used to drive moveable members, including but not limited to motors used to drive automatic vehicle windows and motors used to... | 03/11/2008 |
| 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 |
| 7339414 | Method and circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance The invention relates to a method and a circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance, which contains a controlled semiconductor switch, such as a triac, and an electric consumer. Said switc... | 03/04/2008 |
| 7339394 | Current sensing in a two-phase motor A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first step 100 includes reading a duty cycle... | 03/04/2008 |
| 7336462 | Alternator and starter tester protection apparatus and method An method and apparatus testing an alternator and/or starter assembly including a power source for energizing the alternator and/or starter, a computer processor for monitoring electrical current supplied to energize the alternator and/or starter wherein the compute... | 02/26/2008 |
| 7336060 | Circuit and method for controlling a DC-DC converter by enabling the synchronous rectifier during undervoltage lockout A control circuit for a DC-DC converter that prevents a deficiency from occurring due to sudden interruption in power supply. The control circuit activates and inactivates a main switching output transistor and a synchronous rectification output transistor to conver... | 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 |
| 7332839 | Electric machine having a laminated core with a portion jutting from the outer surface to form a gap for a flux sensor An electric machine includes a stator and a rotor interacting with the stator, wherein the stator and/or the rotor has/have a conducting device for guiding a magnetic flux. The conducting device includes a gap which is provided in a path of the magnetic flux, and a ... | 02/19/2008 |
| 7329846 | Electric range An electric range includes a circuit board provided with at least one semiconductor chip and adapted to control an electric current to be applied to an induction heating device, a heat sink to absorb heat of the semiconductor chip to discharge the heat to the outsid... | 02/12/2008 |
| 7319304 | Shunt connection to a PCB of an energy management system employed in an automotive vehicle A method of coupling a shunt to a printed circuit board (PCB) of an energy management system is provided. The method includes coupling flexible electrical connectors to the shunt and soldering the flexible electrical connectors to connection points on the PCB of the... | 01/15/2008 |
| 7312605 | AC power supply testing module and method for booting a main board An AC power supply testing method upon booting a main board is provided. The testing method is applied to a main board, a microprocessor is in connection with the main board, and a relay is connected with the microprocessor, an AC power supply and a system power sup... | 12/25/2007 |
| 7310002 | Motor inspection method A method of measuring the counter-electromotive force of the motor accurately is disclosed. The counter-electromotive force of the motor changes with the rotational position and the rotational speed. The value of the counter-electromotive force measured during the i... | 12/18/2007 |
| 7304446 | Sensorless and brushless DC motor A sensorless and brushless motor is disclosed including a stator, a rotor, a control circuit and an induction coil (50). The stator includes a stator core (30) and a stator coil (34) wound around the stator core. The rotor includes a rotor magne... | 12/04/2007 |
| 7300041 | Vertical alternator holding apparatus and method for alternator testing An apparatus for supporting an alternator for testing uses a supporting pin mounted to extend in a first direction relative to the alternator. A first holding pin extends in a second direction relative to the alternator, and has two ends with a first end having a bo... | 11/27/2007 |
