Celebrity Inventors
Superstar singer Michael Jackson co-patented a "Method and means for creating anti-gravity illusion" in 1993.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7348750 | Method, apparatus and article for load stabilization A system, method, and article for protecting a power source for a machine from sudden changes in load. In one embodiment, energy is wasted in a winding of a motor in response to a decrease in a load presented to the power source. ... | 03/25/2008 |
| 7346272 | Anti-trap protection detection based on comparing the duty cycle of a PWM control system In order to create a method and an apparatus for anti-trap protection detection for displaceable window and door elements by means of which faster and more stable adjustment to current physical conditions can be achieved during system actuation, in the system the mo... | 03/18/2008 |
| 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 |
| 7166981 | Actuator, motor unit and controller unit An actuator, which allows a controller to be commonly applied to a plurality of models without requiring complicated setting operation of control parameters, and is superior in cost effectiveness, reusability and expandability, is provided. And further, a motor unit... | 01/23/2007 |
| 7095209 | Method and apparatus to regulate torque provided to loads A method and apparatus for use with a controller for controlling a machine wherein a torque reference value is provided, the method for identifying an error representative of the difference between the torque reference value and the torque applied to the machine and... | 08/22/2006 |
| 7075255 | Variable speed controller for a family of multi-tap motors A system for variable speed motor control provides continuous variable speed motor controller for each motor or motor application within a family of multi-tap motors while using a single controller. The single controller utilizes a wave chop technique providing vari... | 07/11/2006 |
| 7026771 | Motor control apparatus and electric appliance using the same A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed sampling period. The processor obtains a load current instant value every s... | 04/11/2006 |
| 6922038 | Speed control circuit for a dc brushless motor A speed control circuit for a dc brushless motor includes a switch circuit and a voltage-detection circuit. The voltage-detection circuit is actuated depending upon high or low voltage of power supply to thereby cause the switch circuit to output high or low operati... | 07/26/2005 |
| 6885970 | Saliency-based position estimation in permanent magnet synchronous motors A method and system for the sensorless estimation of the states of the mechanical subsystem of a motor are disclosed. In particular, the method and system split the estimation problem into two sub-problems: the estimation of motor parameters as a function of positio... | 04/26/2005 |
| 6844701 | Overmodulation systems and methods for induction motor control Systems and methods for controlling an induction motor including detecting a field weakening operation state of the motor, wherein the field weakening operation state is detected when a flux current, Id, in the motor is reduced to a predetermined fraction... | 01/18/2005 |
| 6844700 | Inverter apparatus An inverter apparatus for converting a DC power converted from an input AC power to an output AC power of a variable frequency and a variable electric power to drive an induction motor at a variable speed. The inverter apparatus includes a rectifying unit, a filter ... | 01/18/2005 |
| 6822419 | Speed control circuit for a DC brushless motor A motor speed control circuit includes a switch circuit and a voltage-detection circuit. The voltage-detection circuit is actuated depending upon high or low voltage of a power supply to thereby cause the switch circuit to output high or low operating voltage to a d... | 11/23/2004 |
| 6670786 | Apparatus for controlling an induction motor If a speed instruction value is less than a predetermined value, the output current of a power-conversion unit is controlled to be larger than a current value in an ordinary no-load operation, or a frequency instruction value is calculated based on a spee... | 12/30/2003 |
| 6661195 | Starting motor for an internal combustion engine, having a safety device A starting motor for an internal combustion engine, where a control circuit monitors or controls the temperature of the starting motor or the carbon brushes, and if necessary, limits or switches off the primary current. The temperature is indirectly deter... | 12/09/2003 |
| 6636012 | Stator and rotor resistance identifier using high frequency injection A method and apparatus for generating stator and rotor resistance estimate, the method including the steps of providing high frequency injection voltage signals to a three phase motor, rotating three phase feedback current therefrom, converting the feedba... | 10/21/2003 |
| 6636013 | Method of rapidly starting an asynchronous motor In order to accelerate an asynchronous motor with a squirrel-cage rotor even under load extremely quickly, and in particular within the time of an electromagnetic rotor time constant, in order to be able to cause it to start with a so-called kick start, w... | 10/21/2003 |
| 6628101 | Electronic shorting of wound rotor windings A method for shorting rotor windings in a wound rotor induction machine is disclosed. The method includes the steps of monitoring rotor current for a frequency indicative of a desired steady-state operating condition and electronically shorting the rotor ... | 09/30/2003 |
| 6600278 | Clean power common buss variable frequency drive system A N pulse variable frequency drive for driving two or more motors that is the combination of two or more variable frequency drives with each drive driving an associated one of the two or motors. One application is a decanter centrifuge which has a main mo... | 07/29/2003 |
| 6597148 | Method for controlling an electrical machine and an inverter A method for controlling an electrical machine while it is connected to an inverter comprising phase-specific switching components generating an output voltage, an optimum switching table arranged to select a switching combination for the switching compon... | 07/22/2003 |
| 6580234 | Monitoring apparatus A monitoring apparatus for monitoring operation of a no-back device of an actuator assembly driven by a motor, the apparatus comprising sensor device operable to sense an operating parameter of the motor for determining when the motor's output drive is in... | 06/17/2003 |
| 6532405 | Method for detecting a locked axle on a locomotive AC traction motor An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an AC motor. The method includes conducting a speed test by estimating axle speed and comparing estimated axle speed to measured vehicle... | 03/11/2003 |
| 6504329 | Apparatus and method for controlling permanent magnet electric machines A control scheme for an surface-mounted permanent-magnet synchronous (SMPMS) drive uses a combination of an open-loop magnetizing current reference calculation and a stabilizing feedback term, which speeds-up the torque transient response. The feedback te... | 01/07/2003 |
| 6465983 | Overcurrent protection device At Step Sb3, a duty factor, which was calculated at Step Sb2 on the basis of a data for a feed-back control, is compared with a limit value of the duty factor. If the duty factor is less than the limit value, a pulse for the PWM control is modulated to ha... | 10/15/2002 |
| 6359416 | Adaptive predictive synchronous current frame regulator method and apparatus A method and apparatus for controlling a synchronous frame current regulator wherein the apparatus includes a current predictor and a current predictor adjuster, the current predictor predicting the current provided to a plant from both a forcing function... | 03/19/2002 |
| 6344726 | Method of controlling an induction motor If a speed instruction value is less than a predetermined value, the output current of a power-conversion unit is controlled to be larger than a current value in an ordinary no-load operation, or a frequency instruction value is calculated based on a spee... | 02/05/2002 |
| 6327524 | System for high efficiency motor control A device for high efficiency motor control includes an induction motor and a controller. The induction motor generates a motor torque and has a given rotor resistance and magnetizing inductance at a specific temperature. The controller is coupled to and c... | 12/04/2001 |
| 6194864 | Control device for induction motor An induction motor control device includes a power conversion circuit, a current sensor, a current component calculation circuit for calculating first and second current components, a magnetic flux command calculation circuit for calculating a magnetic fl... | 02/27/2001 |
| 5986438 | Rotary induction machine having control of secondary winding impedance A rotary induction machine having wound primary and secondary windings with resistive means connected in series with secondary windings and inductive reactive means connected across said resistive means, with the inductive reactance means and resistive me... | 11/16/1999 |
| 5740880 | Speed tracking of induced armature field in electric power assisted steering Electric motors having controllable induced armature fields, such as induction motors and synchronous reluctance motors, are used in power assisted steering systems for motor vehicles. Power is conserved by tailoring induced armature fields or rotor flux ... | 04/21/1998 |
| 5247237 | Control device of induction motor An object of the invention is to provide a control device of an induction motor where an inverter circuit can be protected from overcurrent by stable current limitation operation not only at steady operation but also at rapid acceleration/deceleration or ... | 09/21/1993 |
