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 |
| 8188698 | Integrated fan drive system for air-cooled heat exchanger (ACHE) An integrated fan drive system for air-cooled heat exchangers. The integrated fan drive system has a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan that is directly connected to the rotatable shaft, and a variable frequency drive devic... | 05/29/2012 |
| 8183805 | System for controlling the steady-state rotation of a synchronous electric motor The control system comprises a switch (TR) in series with a stator winding (W) between two terminals (A, B) connected to an alternating supply voltage source (V), a first detector circuit (2) capable of providing a signal (Voi) indicating when the ... | 05/22/2012 |
| 8183810 | Method of operating a motor Embodiments of the invention provide a method of operating a motor connected to a power device having a reduced current rating. The motor can include an increased torque constant and/or an increased back electromagnetic force constant in order to decrease a peak cur... | 05/22/2012 |
| 8183808 | Motor overload protecting method A motor overload protecting method includes (a) detecting an instantaneous motor current value in real-time, calculating a current integral value in each of a corresponding integral period, and resetting the current integral value to 0 at an end of the integral peri... | 05/22/2012 |
| 8183812 | Synchronous oscillating fan system for livestock shelter A synchronous fan system is provided which intermittently calibrates the fans by rotating periodically the fans each to a common stop position. ... | 05/22/2012 |
| 8179076 | Chip structure capable of smoothing slope of signal during conversion The present invention discloses a chip structure capable of smoothing slope of signal during conversion. And the chip structure is suitable for a DC motor which is embedded in a portable electronic device. The DC motor is for adjusting the focal distance of a digita... | 05/15/2012 |
| 8179065 | Position sensorless control of permanent magnet motor Systems and methods of controlling a permanent magnet motor without a mechanical position sensor are provided. In accordance with one embodiment, a motor control system includes an inverter configured to receive direct current (DC) power and output a power waveform ... | 05/15/2012 |
| 8179080 | Reciprocating actuator with closed loop servocontrol A reciprocating actuator includes at least one element moving reciprocally relative to a rack, a device for driving the moving element in a driving direction, an element for returning the moving element in an opposite direction, at least one sensor for detecting the... | 05/15/2012 |
| 8179083 | Starting device for electric motors Starting device for electric motors provides a circuit including: a first branch connected at one end to a common point and at the opposite end to the start winding of the motor, whereon a starting capacitor, a resistor and fixed contacts of a relay are inserted in ... | 05/15/2012 |
| 8174220 | Apparatus for controlling permanent-magnet rotary electric machine Apparatus controlling a permanent magnet rotary electric machine. After the apparatus controls a current control portion, when a rotor of the machine rotates at a constant speed, to supply a predetermined current to an armature, the apparatus performs a dq vector co... | 05/08/2012 |
| 8174215 | Motor speed controller In a motor speed controller, feedback control is implemented at a gain independent of the target rotational speed ωT while the increase in the circuit size or processing load is reduced. The rotational speed ω of the motor is controlled on the basis of ... | 05/08/2012 |
| 8169173 | Method for controlling a vehicle drive unit A method for controlling a vehicle drive unit, the vehicle drive unit having at least two individual motors. A total actual torque is continuously compared with an allowable total torque, the total actual torque being calculated from individual actual torque values ... | 05/01/2012 |
| 8169170 | Motor driving device, motor device, and integrated circuit device A motor driving device (100) includes an inverter (20), a speed control unit (40), and a regeneration preventing means (50). The inverter (20) converts supplied DC power to driving power for driving a motor (10), and supplie... | 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 |
| 8164286 | Method for starting a permanent magnet single-phase synchronous electric motor and electronic device for implementing said method Method for starting a single-phase synchronous electric motor using permanent magnets with simple and cost-effective implementation, said method comprising a step of application of a control logic of the switch that provides a first and a second condition for switch... | 04/24/2012 |
| 8164293 | Method of controlling a motor Embodiments of the invention provide methods of controlling a motor, such as a servo motor. One method can include monitoring a current temperature of the motor and a power stage of the motor substantially continuously and substantially in real-time. This method can... | 04/24/2012 |
| 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 |
| 8159167 | Electronically commutated motor An electronically commutated motor (20) has a rotor (28) and a rotor position sensor (30), which sensor, during operation, furnishes a rotational position signal (34). A stator interacts with the rotor (28). The stator has a stator... | 04/17/2012 |
| 8154237 | Sealed electric compressor A sealed electric compressor having a normally-off type pressure switch and a fuse element. The pressure switch is placed in a sealed housing, connected parallel to a main winding of an electric motor, and, when the pressure of refrigerant in the sealed housing is a... | 04/10/2012 |
| 8154239 | Medical manipulator A medical manipulator includes an actuator block having a motor, a coupler detachably mounted on the actuator block and having a rotor connected to a rotatable shaft of the motor, a distal-end working unit mounted on a distal end of a joint shaft, which extends from... | 04/10/2012 |
| 8148929 | Power electronic module IGBT protection method and system A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for reducing the switching frequency of an inverter module based on the junction temperature variation of the IGBT. ... | 04/03/2012 |
| 8143831 | Regulating device for regulating the voltage on a high-side load The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the ... | 03/27/2012 |
| 8143837 | Inverter control apparatus An inverter control apparatus includes: a state estimator that calculates an estimated current vector and an estimated magnetic flux vector from a motor command voltage vector, a detected current vector, and a motor parameter; a correction voltage calculator that ca... | 03/27/2012 |
| 8143835 | Method of driving DC/DC converter, method of controlling DC/DC converter apparatus, method of controlling driving operation of vehicle, and method of driving fuel cell system Under the same target voltage, a basic duty ratio depending on a target ON time is set, and prior and subsequent duty ratios before and after upper arm switching devices or lower arm switching devices are driven with the basic duty ratio are set as a basic duty rati... | 03/27/2012 |
| 8138698 | Motor rotation irregularity detection circuit A motor rotation irregularity detection circuit includes a first integrator for integrating a rotation detection signal that is output from a driver of a sensor-less motor; a differentiator for outputting a difference between a binary signal based on the integral in... | 03/20/2012 |
| 8138701 | Method for determining the position of a rotor of an electric motor without sensors Disclosed is a method for detecting the current position of a rotor, in particular the angle of rotation of the rotor, an electromotor and a method for detecting the speed and/or the angle of rotation of an electromotor. The speed of the electromotor is hereby impli... | 03/20/2012 |
| 8134325 | Controller The controller includes a position commander and an error corrector. The position commander outputs a position command value for moving a moving mechanism. The error corrector includes a feedforward controller and a compensator calculator. The feedforward controller... | 03/13/2012 |
| 8134317 | Motor controller, motor drive system and pump unit A motor controller for controlling a permanent magnet motor having a rotor having a permanent magnet and a stator having multiphase windings including a position detector generating and outputting rotor rotational position signal; a waveform data storage storing sin... | 03/13/2012 |
| 8134322 | Motor control apparatus In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting pe... | 03/13/2012 |
| 8125179 | Controlling a power of an electrical motor A motor control circuit (MC) comprising input terminals (IT1, IT2) to receive a rectified input voltage (Vrm), and output terminals (OT1, OT2) to supply a motor drive signal (Vm). A switching circuit (1) is alternately in an on-sta... | 02/28/2012 |
| 8125167 | Motorized barrier adjustment apparatus and method A motorized barrier adjustment apparatus and method includes, in particular, in accordance with one embodiment, motorized barrier adjustment apparatus with a barrier. A controllable motor is connected with the barrier, the controllable motor is conformed to detect m... | 02/28/2012 |
| 8125170 | Techniques and apparatus for the measurement of mutual inductance in a switched reluctance machine A system and technique for measuring the mutual inductance in a switched reluctance machine (SRM). In a first example embodiment of the technique, a voltage pulse is applied to primary coil when the machine is stationery. By measuring current in the primary coil and... | 02/28/2012 |
| 8125176 | Motorized system for closing a building The invention relates to a motorized system for closing a building, of the roller shutter type with the particular feature that it has a two-phase asynchronous motor which comprises two windings (2; 3) and is combined with a speed-varying device (5). | 02/28/2012 |
| 8125174 | Motor driven electronic apparatus A driving method of a high speed rotation stepping motor exhibiting good starting performance, its driving circuit, and a vibration motor and a fan motor employing them. The motor driven electronic apparatus comprises a two pole flat stator, a rotor consisting of a ... | 02/28/2012 |
| 8125165 | Motorized screen configuration and grouped control methods, automatic controller for implementing this method and home automation installation comprising such an automatic controller An automatic control mechanism for a group of motorized screens in which each screen includes a load bar that is displaced according to a predefined travel and wherein the control mechanism determines a shift parameter between a first reference position of each scre... | 02/28/2012 |
| 8120299 | Motor controller of air conditioner The present invention relates to a motor controller of an air conditioner, including an inverter including a plurality of switching elements and adapted to convert a DC voltage, input through switching operations of the switching elements, into an AC voltage and sup... | 02/21/2012 |
| 8120305 | Method for starting single phase induction motor and electronic relay using the same An electronic relay for single phase induction motor, the electronic relay including a triac located between a start winding and a start capacitor of the single phase induction motor to control current flow of the start winding and an induced voltage detection circu... | 02/21/2012 |
| 8115432 | Triphase rotating electrical machine A triphase rotating electric machine includes three coils evenly distributed around a rotational axes of the machine, and at least one first sensor, capable of generating a periodic signal to represent the position of the machine around the axle and a control circui... | 02/14/2012 |
| 8115431 | Inverter control apparatus and motor drive system An inverter control apparatus that controls a three-phase inverter which transforms a direct-current voltage into an alternating three-phase voltage, the inverter control apparatus includes: a voltage command vector generation portion that generates a first voltage ... | 02/14/2012 |
| 8115434 | High-speed self-cascaded electric machine An electric machine is disclosed comprising a first energy source, a second energy source, and a stator which comprises a first set of windings and a second set of windings. The electric machine has a rotor and a controller, the controller configured to control the ... | 02/14/2012 |
