Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 8183817 | Apparatus for switching windings of AC three-phase motor A winding switching apparatus for switching windings of an AC three-phase motor is provided. In each winding switching section of the winding switching apparatus, a positive-side charging resistor, a negative-side charging resistor, and a capacitor are connected in ... | 05/22/2012 |
| 8164297 | Power converter and motor driving system An object of the present invention is to provide a power converter in which the open-phase can be detected in a broader frequency region even if a predetermined relation is kept between the output voltage and the frequency. In order to achieve the above objects, a p... | 04/24/2012 |
| 8159177 | System for realizing rotor variable frequency speed control asynchronously and simultaneously by driving multiple motors via one inverter A system for realizing rotor variable frequency speed control asynchronously and simultaneously is disclosed. Multiple motors are driven via one inverter, which consists of a motor group, a rectifier group, a chopper group, an isolator group, an amperite group, a po... | 04/17/2012 |
| 8143838 | Phase current estimation apparatus for motor and magnetic pole position estimation apparatus for motor A phase current estimation apparatus for a motor capable of suitably improving estimation accuracy of phase currents is provided. The phase current estimation apparatus 10 of the motor includes a control unit 24 that decomposes a command voltage vector... | 03/27/2012 |
| 8138712 | Motor drive system and its control method A ripple detection unit detects a ripple current width of a motor current controlled according to PWM control. A ripple reference setting unit sets a reference value of the ripple current width. A frequency adjusting unit sets a control signal indicating a carrier f... | 03/20/2012 |
| 8138711 | Motor controller of air conditioner and method of the motor controller The present invention relates to a motor controller for an air conditioner and a motor control method. The motor controller including a converter converting AC utility power into DC power and an inverter having a plurality of switching elements, the inverter receivi... | 03/20/2012 |
| 8115433 | Electrical system for pulse-width modulated control of a power inverter using phase-shifted carrier signals and related operating methods Systems and methods are provided for pulse-width modulated control of power inverter using phase-shifted carrier signals. An electrical system comprises an energy source and a motor. The motor has a first set of windings and a second set of windings, which are elect... | 02/14/2012 |
| 8115430 | Methods, systems and apparatus for controlling operation of two alternating current (AC) machines A system is provided for controlling two AC machines. The system comprises a DC input voltage source that provides a DC input voltage, a voltage boost command control module (VBCCM), a five-phase PWM inverter module coupled to the two AC machines, and a boost conver... | 02/14/2012 |
| 8106620 | Vector control device for alternating-current electric motor There is provided a vector control device for an alternating-current electric motor having a damping controller which automatically calculates an optimum damping operation amount and does not require any gain setting itself, whereby an adjustment work of a control s... | 01/31/2012 |
| 8106619 | Position sensorless controller for permanent magnet motor In a calculation for estimating axis error in a permanent magnet motor, a d-axis commanded voltage value is added to the product of three signals, which are a q-axis detected current value or commanded current value, an inductance value, and an estimated speed value... | 01/31/2012 |
| 8072180 | Synchronous sampling of PWM waveforms A device for filtering a carrier frequency of a PWM waveform. The device includes a low-pass filter for converting the PWM waveform into an analog signal. The device further includes a sampling analog-to-digital converter receiving the analog signal from the low-pas... | 12/06/2011 |
| 7960940 | Motor control device A motor control device for controlling a d-axis current and a q-axis current on dq coordinates to control a motor, includes a q-axis current command value setting unit which sets a q-axis current command value, an upper limit/lower limit setting unit which sets an u... | 06/14/2011 |
| 7928686 | Electric motor control device, electric vehicle, and hybrid electric vehicle An electric motor control device includes a direct current power source; an inverter interposed between an electric motor and the direct current power source, the inverter device controlling an exchange of electric power therebetween; an inverter control unit that g... | 04/19/2011 |
| 7821223 | Vector controller for a permanent magnet motor and inverter module In a system in which current is detected in an inexpensive manner or in a system in which a position detector is omitted, the present invention provides a high-efficiency vector controller for a permanent magnet motor that can minimize current at the same torque eve... | 10/26/2010 |
| 7800339 | Drive control assembly for controlling a motor A drive control assembly for a motor including a variable frequency drive module for providing variable speed control for the motor, a bypass module for providing bypass control for the motor, and a switch for switching control for the motor between the variable fre... | 09/21/2010 |
| 7791309 | Motor controller and method of controlling the motor The present invention relates a motor controller and a motor control method of controlling a motor having a stator coil and a rotator. The motor controller includes: an activating operator receiving an operation command with a prescribed target frequency while the m... | 09/07/2010 |
| 7719226 | Highly responsive permanent magnet motor controller Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated a... | 05/18/2010 |
| 7710066 | Motor control device A motor control device that controls a permanent-magnet synchronous motor has: a magnetic flux controller that derives, as a specified excitation current value, a specified current value corresponding to a d-axis component of a current passing through an armature wi... | 05/04/2010 |
| 7679308 | Motor control device Let the rotating axis whose direction coincides with the direction of the current vector that achieves maximum torque control be called the qm-axis, and the rotating axis perpendicular to the qm-axis be called the dm-axis. A motor control device switches its operati... | 03/16/2010 |
| 7659688 | Method and system for resolver alignment in electric motor system Methods and systems are provided for aligning a resolver in an electric motor system. The method includes commanding a d-axis current command and a speed command, operating an electric motor without a load in response to the d-axis current command and the speed comm... | 02/09/2010 |
| 7622886 | Method for determination of the risk to disturbance-free operation of a frequency converter The invention relates to a method for determining the chance of a disturbance-free operation of a frequency converter (2) connected to a feeding network (18). According to the invention, during the operation of said frequency converter (2), an i... | 11/24/2009 |
| 7595604 | Motor control device Let the rotating axis whose direction coincides with the direction of the current vector that achieves maximum torque control be called the qm-axis, and the rotating axis perpendicular to the qm-axis be called the dm-axis. A motor control device switches its operati... | 09/29/2009 |
| 7586286 | Method and apparatus for motor control A system and method for controlling a permanent magnet motor are disclosed. Briefly described, one embodiment receives a torque command and a flux command; receives information corresponding to a direct current (DC) bus voltage and a motor speed; computationally det... | 09/08/2009 |
| 7583049 | Sensorless control systems and methods for permanent magnet rotating machines Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator... | 09/01/2009 |
| 7583048 | Controller for motor A controller for a motor carries out field weakening control by using a simple construction to change the phase difference between two rotors, which are disposed around a rotating shaft, without depending on the number of revolutions of a motor. The controller for a... | 09/01/2009 |
| 7576511 | Motor control device and motor control method The present invention employed a motor control device including: current sensors which detect currents in each phase of a three-phase motor; a coordinate conversion device which computes a d-axis actual current and a q-axis actual current in dq-coordinates from phas... | 08/18/2009 |
| 7573227 | Controller and control method of permanent magnet type rotary motor A controller of a permanent magnet type rotary motor of the present invention includes: a current difference calculator decomposing a primary voltage difference which is a difference between a primary voltage of the permanent magnet type rotary motor and a maximum v... | 08/11/2009 |
| 7567054 | Control circuit and method of controlling rotation frequency of spindle in optical disc drive for reducing frequency difference of output signals respectively corresponding to different disc rotation modes A control circuit and a control method of controlling a rotation frequency of a spindle in an optical disc drive, the control circuit comprising: a spindle controller, electrically coupled to the spindle, for driving the spindle to rotate an optical disc according t... | 07/28/2009 |
| 7567055 | Controller for brushless motor A controller for a brushless motor determines difference between target currents and detected currents in a dq coordinate system and determines a target voltage applied to an armature winding based on a feedback calculation, such as PI (Proportional Integral) calcul... | 07/28/2009 |
| 7560896 | Vector control apparatus for permanent magnet motor A vector control apparatus for a permanent magnet motor operated in the region of weak magnet field, wherein when the output voltages of the power converter saturate, the phase error command value represented by the difference between the angular position of the ref... | 07/14/2009 |
| 7545116 | Driver for induction motor and method of driving the same An object of the present invention is to provide a driver for an induction motor which performs an operation at an acceleration suitable for the magnitude of a load and is excellent in efficiency, without an acceleration failure. The driver for an induction motor in... | 06/09/2009 |
| 7545115 | Motor control and driver for electric boosting application The invention proposes a system for driving a compressor, comprising an induction motor (2) for driving the compressor (3), said induction motor including a squirrel cage rotor, and a controller (1) for controlling the induction motor, said cont... | 06/09/2009 |
| 7511449 | Electric motor system implementing vector and slip control A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter operationally connected to the power source and the electric machine and con... | 03/31/2009 |
| 7511448 | Motor control device In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unit 9 outputs a superimposed signal idh of a repetitive waveform, such as a triangular wave or a sine wave. A d-axis current command gene... | 03/31/2009 |
| 7511450 | Frequency converter, motor, motor drive system and maintenance method for motor drive system A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a... | 03/31/2009 |
| 7504797 | Motor control device A motor control device includes an estimator for estimating a rotor position of a motor having a salient pole by using a value corresponding to a q-axis inductance of the motor as an operation parameter where an estimated axes for the control corresponding to d-q ax... | 03/17/2009 |
| 7482777 | Motor control device The motor control device includes a current detecting portion for detecting a phase current that flows in an armature winding of a stator of a three-phase motor based on current that flows between an inverter for driving the motor and a DC power supply. The motor co... | 01/27/2009 |
| 7463006 | Motor and drive control device therefor The invention provides a drive control device for the motor as well as an electric power steering apparatus using the motor and the drive control device. Respective phase current command values are calculated on the basis of vector control. Pseudo-vector control for... | 12/09/2008 |
| 7456603 | Phase detection circuit, resolver/digital converter using the circuit, and control system using the converter A small-sized and low-cost phase detection circuit which has improved noise immunity. The phase detection circuit comprises a multiplier for multiplying an input signal by a reference signal and outputting a first signal, an integration circuit for integrating the f... | 11/25/2008 |
| 7453231 | Electric vehicle control device An object of the present invention is to provide an electric vehicle control device which is capable of detecting even a state in which only one phase of one induction motor is disconnected in a system where a plurality of induction motors are connected in parallel ... | 11/18/2008 |
