Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8344682 | Method and apparatus for failsafe monitoring of a movement variable on an electrical drive A first and a second drive current for an electrical drive are generated as a function of a nominal value for a movement variable, such as drive torque or rotational speed. An alternating magnetic field is generated in the drive by the drive currents. The alternatin... | 01/01/2013 |
| 8217616 | Electric motor control with buck boost converter A power supply for an electric motor includes a converter that can increase and decrease a voltage supplied into an inverter and then into the stator windings of the motor. As a separate feature, the inverter includes a control coil which is positioned within a moto... | 07/10/2012 |
| 7880424 | Rotary electric apparatus having rotor with field winding inducing current therethrough for generating magnetic field A rotary electric apparatus comprise a synchronous machine of field winding type, an inverter, a DC power supply, a current flow regulator, and a controller. The DC power supply outputs first voltage of a first voltage value and second voltage of a second voltage va... | 02/01/2011 |
| 7800337 | Control apparatus for AC rotary machine and method for measuring electrical constant of AC rotary machine using the control apparatus A control apparatus for an AC rotary machine, including first voltage command calculation means for calculating first voltage commands from current commands, an angular frequency, and constant set values of the AC rotary machine, second voltage command calculation m... | 09/21/2010 |
| 7714529 | Permanent magnet synchronous motor and controller therefor A low-cost sine-wave drive for a 3-phase permanent magnet synchronous AC machines (PMSM) in open-loop control is based on the measurements of two linear Hall sensors. The two Hall sensors are excited by a magnetic ring with the same pole number as the PMSM rotor mag... | 05/11/2010 |
| 7659685 | Method of estimating the state of a system and relative device for estimating position and speed of the rotor of a brushless motor A method for estimating the state of a system, as well as an extended Kalman filter (EKF), allows nonlinear mathematical models to be used for describing the system. Accurate precision is provided since the method is based on an EKF technique while using a filter th... | 02/09/2010 |
| 7518332 | Brushless synchronous motor and driving control apparatus therefor A brushless synchronous motor is provided in a simple configuration and at a low cost. The brushless synchronous motor comprises a rotor having salient magnets arranged in a circumferential direction, a stator having driving magnetic poles arranged in the circumfere... | 04/14/2009 |
| 7518331 | AC rotating electric machine control method and electrical power train system Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient motor zone. In a case of rated power generation, when the motor spee... | 04/14/2009 |
| 7372222 | Control device for motor-driven 4WD vehicle and related control method A control device for a motor-driven 4WD (four-wheel-drive) vehicle includes a 42v alternator (motor-generator) driven by an engine to generate three-phase AC power with 42 volts, a step-up and step-down inverter rectifying and stepping down three-phase AC power, gen... | 05/13/2008 |
| 7358698 | Field-winding type of synchronous machine A field-winding type of synchronous machine comprises a stator with an armature winding wound phase by phase, a rotor having a rotor core with a field winding wound, and a circuit enabling an armature current to pass the armature winding, the armature current corres... | 04/15/2008 |
| 7352151 | Method of estimating magnetic pole position in motor and apparatus of controlling the motor based on the estimated position A magnetic pole position in a synchronous motor having salient poles is estimated from an instructed voltage applied to the motor, a current generated from the instructed voltage and parameters. To estimate the position substantially matching with a true magnetic po... | 04/01/2008 |
| 7348684 | Drive unit A drive unit is provided including a synchronous machine, a pulse counter unit for detecting a rotor position during the running operation of the synchronous machine, and a control unit. The control unit is constructed such that, with the start of the operation of t... | 03/25/2008 |
| 7329960 | System and method for propelling a large land-based vehicle using a dual function brushless dynamoelectric machine A propulsion system for a relatively large land-based vehicle, such as a locomotive or off-highway vehicle, is provided. The system may include a brushless dynamoelectric machine made up of a main alternator having a main rotor and a main stator, and an auxiliary al... | 02/12/2008 |
| 7329973 | Rotary electric machine The present invention provides a rotary electric machine, of which the occupied volume can be reduced and which allows a space in an electric apparatus equipped therewith to be utilized effectively. A slot insulator 15 is integrally formed with a holder mount... | 02/12/2008 |
| 7294988 | Synchronous motor drive unit and a driving method thereof A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its star... | 11/13/2007 |
| 7276876 | Synchronous motor driving apparatus A synchronous motor driving apparatus having a power converter which applies AC variable voltages having variable frequency to a synchronous motor includes a pulsating current application unit for applying pulsating current to the synchronous motor and a magnetic po... | 10/02/2007 |
| 7271565 | Apparatus for controlling speed of fan motor of air-conditioner An apparatus for controlling a speed of a fan motor (HIM (Hybrid Induction Motor)) of an air-conditioner extends a speed control range of a fan motor of an air-conditioner by controlling revolutions per minute (RPM) of the fan motor. In order to extend the speed con... | 09/18/2007 |
| 7268441 | Control device for motor generator In the control device for motor generator in which an engine is started and power generation is performed while a vehicle is running, a field current limit value Ifm in electric driving to start the engine is larger than a field current limit value Ifg in power gene... | 09/11/2007 |
| 7256564 | System and method for attenuating noise associated with a back electromotive force signal in a motor A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the mot... | 08/14/2007 |
| 7245096 | Method and apparatus for controlling the speed of a DC motor A method and apparatus for controlling the speed of a DC electric motor receives a periodic commutation signal having a fixed duration on cycle and an off cycle. The commutation signal then is modified to form a periodic modified commutation signal having substantia... | 07/17/2007 |
| 7235947 | Synchronous motor control method and synchronous motor control system A desired q-axis current is determined based on a desired torque, and a desired d-axis current is determined based on the rotating speed of a synchronous motor when the terminal voltage of the synchronous motor coincides with a predetermined maximum permissible volt... | 06/26/2007 |
| 7230399 | Vehicular generator-motor system A vehicular generator-motor 1 is composed of a rotor, a stator having three phase armature winding 2, and a converter 4. The rotor is provided with a field winding 3 for magnetizing a plurality of magnetic pole pieces 14a... | 06/12/2007 |
| 7227339 | Power generation controller of vehicle power generator The present invention relates to a power generation controller of a vehicle power generator, which includes: voltage detection means for sampling a voltage of a battery based on a reference clock signal; duty range setting means for setting a range for an ON/OFF rat... | 06/05/2007 |
| 7224138 | Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. ... | 05/29/2007 |
| 7208908 | Apparatus and method to control torque and voltage of an AC machine A method of controlling a power converter (258) of a synchronous machine drive system (100) determines position and speed of a rotor (350) of the synchronous machine (300); regulates a current vector relative to a reference frame, having ... | 04/24/2007 |
| 7205739 | System and method for attenuating noise associated with a back electromotive force signal in a motor A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the mot... | 04/17/2007 |
| 7199547 | Apparatus, method or system for controlling mobile body In order to control the position of a mobile body without using a position detector, a magnetic pole position of a rotor of a synchronous motor is estimated based on electrical quantities in relation to electric power supplied to the synchronous motor and then the m... | 04/03/2007 |
| 7170261 | Generator with dual cycloconverter for 120/240 VAC operation A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first ... | 01/30/2007 |
| 7145310 | Method and system for controlling permanent magnet synchronous motor A system for controlling a permanent magnet synchronous motor calculates fundamental a d-axis (or q-axis) voltage command based on a difference between a d-axis (or q-axis) current command and a d-axis (or q-axis) current feedback signal, calculates a harmonic suppr... | 12/05/2006 |
| 7132816 | Brushless wound field synchronous machine rotor position tracking with exciter stator current harmonic tracking A field oriented control system for a brushless wound field synchronous machine that determines positioning of a rotor for the machine from exciter stator electrical potentials and current harmonics. ... | 11/07/2006 |
| 7122994 | Control apparatus for a starter/generator system A control apparatus (202) for a starter/generator (110) of an aircraft electrical power system is provided. During a start mode of operation, AC power is provided by the control apparatus (202) to an exciter stator (114) of the starter/ge... | 10/17/2006 |
| 7106021 | Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. ... | 09/12/2006 |
| 7098623 | Method in connection with permanent magnet synchronous machines A method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine the method comprising the steps of calculating first stator flux vector estimate ({circumflex over (ψ)}d,i+j{circumflex over (ψ)}q,i) usi... | 08/29/2006 |
| 7064513 | Phase angle control for synchronous machine control A synchronous machine with 3-phase sensors set 120° apart and 90° advanced is used to provide commutation from a direct current source. A time delay circuit with an electronically implemented algorithm controls torque by delaying the 90° advance. This delay is co... | 06/20/2006 |
| 7045986 | Position sensing method and apparatus for synchronous motor generator system A position sensing apparatus (300) derives rotor position of a synchronous machine (200) from signals output from the machine (200). In one embodiment, the position sensing apparatus (300) comprises: a bandpass filter (322) that fi... | 05/16/2006 |
| 7034497 | Carrier injection sensorless control of aircraft variable frequency wound field synchronous starter/generators A carrier injection sensorless (CIS) starting control system that is capable of determining the angular position and velocity of a rotor for a wound field synchronous machine at or near rest and comprises north-south pole determination and a variable or dual frequen... | 04/25/2006 |
| 7026783 | Drive system A drive system includes a central power supply with a line-commutated converter and a DC/DC converter connected downstream of the line-commutated converter, and a plurality of inverters, each inverter having an output connected a load, for example a motor, and a DC ... | 04/11/2006 |
| 6998726 | Method and system for providing single-phase excitation techniques to a start exciter in a starter/generator system A system and method is provided for starting a prime mover coupled to a synchronous starter/generator. The system includes an exciter converter that provides a non-fundamental only signal to a field winding of an exciter of the synchronous generator. The non-fundame... | 02/14/2006 |
| 6984959 | Wound field synchronous machine control device A synchronous machine control device includes a flux command generator, a magnetic flux estimator, a divider, a flux controller and γ- and δ-axis armature current controllers. The flux command generator produces a flux command from the synchronous machine turning ... | 01/10/2006 |
| 6982533 | Method and apparatus to regulate 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... | 01/03/2006 |
