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| Number | Title | Issue Date |
| 8179072 | Method for counting the number of revolutions of a burr of a coffee mill and appliance comprising such a mill A method for counting the number of revolutions of a burr of a coffee mill driven in rotation by an electric motor. According to the method: at least one electrical parameter Pi of the motor that varies in proportion to the speed of said motor is measured... | 05/15/2012 |
| 8169177 | Electric vehicle An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges whether an overcurrent is generated in an inverter for generation or an... | 05/01/2012 |
| 8169178 | Detection of the angular position of the rotor of a brush motor without using sensors A method of detecting an angular position of a rotor of a motor includes detecting switching ripple peaks and armature current disturbance peaks using a peak detector configured to generate a square wave having edges coinciding with detected peaks. The method furthe... | 05/01/2012 |
| 8072169 | Method of controlling washing machine and motor A method of controlling a washing machine and a motor determines whether a BLDC motor is in a normal state in software without hardware and a user is notified of an abnormal state of the BLDC motor if the BLDC motor is in an abnormal state, thereby ensuring safety. ... | 12/06/2011 |
| 8054026 | Short circuit phase identification method A vehicle drive apparatus includes a battery that is a direct current power source, a converter that increases the voltage of the battery, an inverter connected to a motor that drives the vehicle, an inverter connected to a motor generator that functions as a motor ... | 11/08/2011 |
| 8040096 | Rotary electric system with star-connected multiphase stator windings In a rotary electric system, a switch member includes at least one of a first switch and a second switch. The first switch is connected between a neutral point of multiphase stator windings and a high-side electrode of a direct current power source. The second switc... | 10/18/2011 |
| 8004226 | Method and system for detecting a failed current sensor in a three-phase machine A method of detecting one or more failed current sensor and estimating a phase current for the failed current sensor on a three-phase machine is disclosed. The method may include detecting one or more failed current sensor by determining if an absolute value of a su... | 08/23/2011 |
| 7919946 | Detection method for an electrical polyphase machine The recognition of a polyphase machine (1) connected to a converter (10) is suggested in order to adapt the converter (10) to the connected machine (1) prior to an active productive operation. The following is arranged for. Connecting of ... | 04/05/2011 |
| 7911170 | Sensorless measurement of the rotation frequency of a rotor of an asynchronous machine The present invention relates to a device (20) and a method for sensorless measuring a mechanical rotor frequency of a rotor (6) of an asynchronous machine (40), wherein the rotor (6) has a predetermined defect and the asynchronous machin... | 03/22/2011 |
| 7898203 | Systems and methods for dynamically compensating motor resistance in electric motors Electric motor controllers that dynamically adjust a motor resistance parameter are described. In order to adjust the motor resistance parameter, power is applied the electric motor while the controlled vehicle is stopped and its brake is set so that the vehicle rem... | 03/01/2011 |
| 7834573 | Winding fault detection system A control system is disclosed. The control system has an electric machine coupled to provide power to or receive power from a DC bus and a controller in communication with the electric machine and the DC bus. The controller is configured to receive a voltage from th... | 11/16/2010 |
| 7764038 | Devices, systems, and methods for relieving stress Certain exemplary embodiments comprise a method that can comprise, via a device that originates sub-harmonic vibrations, applying a vibration treatment, to a rotor of an electric motor for a predetermined time period. The rotor can be thermally sensitive. The vibrat... | 07/27/2010 |
| 7692396 | Electromotive furniture drive An electromotive furniture drive for adjusting at least one movable component of a piece of furniture, has at least one electric motor for adjusting the movable component, at least one operating device with switching elements for actuating the electric motor, at lea... | 04/06/2010 |
| 7646160 | Sensor calibration and parameter identification in a multi-phase motor drive In a multi-phase motor drive that includes a bus capacitor, a multi-phase motor, a multi-phase inverter, multiple switches each having an on-state and an off-state, and multiple current sensors each being in series with respective phase winding, a method for checkin... | 01/12/2010 |
| 7629761 | System for measuring current in multiple motor coils using a single sensing element A circuit enables current to be measured in at least two motor leads of a three-phase motor being supplied by a power source generating a chopped sinusoidal waveform for the motor leads. The circuit includes a DC power supply having a pair of output terminals, a cur... | 12/08/2009 |
| 7570004 | System and method for detecting a motor shorting relay failure Methods and systems for detecting a motor shorting relay failure. Exemplary embodiments include methods and systems for determining a motor shorting relay failure in a motor, the motor having first phase winding in a first leg of the motor, a second phase winding in... | 08/04/2009 |
| 7560887 | Control and power module for a rotating electric machine A control and power module for a rotating electric machine comprising a bridge of switches, a plurality of driver circuits for driving a bridge of switches, a control circuit and a plurality of communication connections between driver circuits and a control circuit.... | 07/14/2009 |
| 7462999 | Brushless servo motor tester A permanent magnet brushless (PMBL) servo motor test apparatus and method allow testing of a motor in place. A set of static and dynamic tests is performed to determine proper motor operation of armature windings and rotor feedback devices. The test system of the pr... | 12/09/2008 |
| 7423401 | AC rotary machine constant measuring apparatus for measuring constants of stationary AC rotary machine In an apparatus measuring constants of an induction motor, an inverter converts an inputted voltage command signal into a single-phase AC power and feeds the single-phase AC power to the induction motor, and a currert detector detects a current of the single-phase A... | 09/09/2008 |
| 7392158 | Drive unit for compressor and refrigerator An instantaneous current and instantaneous voltage of a three-phase coil of a brushless DC motor are detected, and the internal condition of a compressor is predicted from these detection values. The prediction about the internal condition of the compressor is made ... | 06/24/2008 |
| 7372228 | Electric power tool with memory capability The invention relates to an electric power tool having a control and/or regulating device for an electric motor. It is provided that the control and/or regulating device (4) is assigned an electronic memory element (5) for at least one operating state ... | 05/13/2008 |
| 7365507 | Power control apparatus for motor A power control apparatus for a motor is disclosed. The power control apparatus includes: a moisture sensor for detecting moisture soaking into a housing including the motor; and a switching unit which is switched by an output signal of the moisture sensor, and swit... | 04/29/2008 |
| 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 |
| 7352188 | Electrically operated vehicle abnormality judging device An electrically operated vehicle abnormality judging device. The invention has an electrically operated machine, a driving signal generation processing section for generating a driving signal by receiving a command value, an inverter for receiving the driving signal... | 04/01/2008 |
| 7323843 | Method and device for treating signals for detection of stator and rotor errors in magnetic circuits in a synchronous machine It is possible to determine the types and values of stator and rotor errors in magnetic circuits in a synchronous machine by measuring the induced voltage (ui) for the terminals of measurement loops which can capture an image of the induction in the measu... | 01/29/2008 |
| 7321846 | Two-wire process control loop diagnostics A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the pro... | 01/22/2008 |
| 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 |
| 7298110 | Integrated motor monitoring system An integrated motor monitoring system includes a housing and a motor disposed within the housing, the motor being configured to provide a power output. The integrated motor monitoring system also includes at least one monitoring device communicatively coupled to the... | 11/20/2007 |
| 7290450 | Process diagnostics A diagnostic device for use in a industrial process includes monitoring electronics or diagnostic circuitry configured to diagnose or identify a condition or other occurrence in the industrial process. The system can be implemented in a process device such as a flow... | 11/06/2007 |
| 7274866 | Power tool and method for controlling a power tool A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the controller, and a speed sensor for monitoring the speed of the motor to generat... | 09/25/2007 |
| 7265954 | Method for estimating DC motor coil temperature, DC motor control method and their devices Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil. ... | 09/04/2007 |
| 7260319 | Abnormality monitoring device for motor control system An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device ca... | 08/21/2007 |
| 7256701 | Motor driver A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply (1) is rectified by a first rectifying circuit (D1 to D6) and smoothed by a capacitor... | 08/14/2007 |
| 7254518 | Pressure transmitter with diagnostics In one embodiment, a pressure transmitter is provided which diagnoses the condition of a primary element and/or an impulse line which connects to a pressure sensor. A difference circuit coupled to the pressure sensor has a difference output which represents the sens... | 08/07/2007 |
| 7239149 | Search coil mount for facilitating inspection of a generator rotor in situ A mount is for installing a probe, such as for example, a search coil, in a variety of locations and orientations within an electrical generator, without requiring the rotor of the generator to be removed. The mount includes a block having a longitudinal hole and a ... | 07/03/2007 |
| 7233121 | Fan speed control circuit A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and ... | 06/19/2007 |
| 7220211 | Multispeed power tool transmission A multi-speed transmission assembly for a rotary power tool. The transmission assembly includes a plurality of transmission stages, with at least two of the transmission stages employing a movable reduction element that permits the transmission stage to be operated ... | 05/22/2007 |
| 7221115 | Method and apparatus for controlling multiplexed motors A control for stopping the rotation of the output shafts of a plurality of multiplexed motors configured in columns and rows with the first connector of each motor in a given column connected in parallel and with the second connector of each motor of a given row of ... | 05/22/2007 |
| 7215518 | Motor power supply line breaking detection method, motor control apparatus and electric power steering mechanism using the same and computer program thereof According to the breaking detection processing, it is determined that (A) iu of AC current (absolute value) supplied to a motor is less than 0.5 amperes or iv thereof is less 0.5 amperes or iw thereof is less than 0.5 amperes, (B) the angular velocity of the motor i... | 05/08/2007 |
| 7191933 | Automatic fare paying device for vehicles and method A compact fare paying device has a housing for receiving a monetary member and at least one verifier unit in the housing for determining the authenticity of the monetary member. A storage device such as a safe can receive the monetary member or a return device can r... | 03/20/2007 |
