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Topic: Rotor (electric)

    Note: these results are not from the primary (high quality) database.

07.23.2003 - Physicists build world's smallest motor using nanotubes and etched silicon With a strong electrical jolt to the stators, the team was able to jerk the rotor and break the outer wall of the nested nanotubes, allowing the rotor to spin freely on the nested nanotube bearings. The entire electric motor is about 500 nanometers across, 300 times smaller than the diameter of a human hair. The rotor could be rapidly flipped back and forth to create a microwave oscillator, or the spinning rotor could be used to mix liquids in microfluidic devices. www.berkeley.edu /news/media/releases/2003/07/23_motor.shtml   (1394 words)

Electric motors & motor controls engineering - hysteresis motor The torque of the rotor acts in direction of positive theta, tending to align the magnetic axis of the distributed rotor flux density with the magnetomotive force axis of the stator. "The hysteresis motor is a permanent-magnet machine designed such that the stator magnetomotive force can produce and change the state of magnetization of the rotor material. Are the differences between hysteresis syncrounous motor and squirrel induction cage motor confined to the rotor? www.eng-tips.com /viewthread.cfm?qid=26261   (1394 words)

The ELECTRIC MOTOR: Here and Now In most cases, regardless of type, electric motors consist of a stator (stationary field) and a rotor (the rotating field or armature) and operate through the interaction of magnetic flux and electric current to produce rotational speed and torque. In this motor, when the stator magnetic field rotates and the rotor windings are shorted, the stator magnetic field motion induces a field into the wound-rotor, once again causing the rotor to turn at nearly the speed of the rotating stator magnetic field. A third type, the shunt-connected motor in which the armature and field windings have the same DC source, is not widely used because of the lack of speed control capabilities imposed by the winding connection. www.freescale.com /webapp/sps/site/overview.jsp?nodeId=02nQXG3MYxCKS2JjTF   (1821 words)

(WO 2005/018074) COMMUTATOR MOTOR AND ELECTRIC POWER DRILL (57) A commutator motor in which a field winding (1) wound around a stator (3) is connected with a rotor winding (4) wound around a rotor (6) through a commutator (7), and an AV power supply is connected with the field winding (1) and the rotor winding (4). A commutator motor in which the rotor can be sustained reliably in a stop state through a simple and inexpensive arrangement is thereby obtained. For information on time limits for entry into the national phase please click here www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=05/18074.050224   (185 words)

Commutator (electric) - Wikipedia, the free encyclopedia The brushes are dark gray and contacting the commutator contacts, and the rotor winding is violet. It typically consists of a set of copper contacts, fixed around the circumference of the rotating part of the machine (the rotor), and a set of spring-loaded carbon brushes fixed to the stationary part of the machine (the stator) that complete the electrical circuit from the rotor's windings to the outside of the machine. A commutator is an electrical switch that periodically reverses the current in an electric motor or electrical generator. en.wikipedia.org /wiki/Commutator_(electric)   (320 words)

Encyclopedia: Helicopter Dual-rotor helicopters have a differential between the two rotor transmissions that can be adjusted by an electric or hydraulic motor to transmit differential torque and thus turn the helicopter. Rotomotion is currently selling a line of small (less than 50 kg) rotorcraft UAVs, including an all electric helicopter. For pitch (tilting forward and back) or roll (tilting sideways) the angle of attack of the main rotor blades is altered or cycled during the rotation creating a differential of lift at different points of the rotary wing. www.nationmaster.com /encyclopedia/Helicopter   (7418 words)

ELPROM ZEM is a joint stock company with almost half-a-century long experience and tradition in manufacturing of electrical machinery. Its production is well known in all former socialist countries, as well as in many West European countries , Asia, Afric Repair and replacement of stator and rotor windings, replacement or partial repair of the magnet line, replacement of bearings and bearing assemblies, as well as repair of other parts and units are carried out for this nomenclature of electric machines. series asynchronous electric motors with squirrel-cage rotor for supply voltage 3 and 6 kV, in accordance to Bulgarian State Standards, IEC and GOST Standards, with degree of protection IP 23, from 2 to 8 poles, power from 200 to 1000 kW, height of rotation axle from 355 to 450 mm; series synchronous electric motors with squirrel-cage rotor for supply voltage 6 kV, 50 Hz, power from 315 to 2000 kW, with degree of protection IP 23; www.bia-bg.com /Business/directory/elpromzem.html   (555 words)

Assessment of Research Needs for Wind Turbine Rotor Materials Technology -- Executive Summary Emerging technologies in active and passive control of both the rotor and the generator need to be studied on an overall system basis considering the probable gains in structural efficiency and reduction in blade life-cycle cost. Failure of the rotor blades was one of the principal and most serious structural failures. In carrying out its charge the committee examined an extensive literature on wind machines and wind turbine rotor materials and was briefed by many experts on these subjects, both in the wind industry and in related industries. www.nap.edu /execsumm/0309044790.html   (2673 words)

Electric motor - Wikipedia, the free encyclopedia A linear motor is essentially an electric motor that has been "unrolled" so that instead of producing a torque (rotation), it produces a linear force along its length by setting up a traveling electromagnetic field. A rotary switch called a commutator reverses the direction of the electric current twice every cycle, to flow through the armature so that the poles of the electromagnet push and pull against the permanent magnets on the outside of the motor. As in the single-phase motor, through electromagnetic induction, the rotating magnetic field induces a current in the conductors in the rotor, which in turn sets up a counterbalancing magnetic field that causes the rotor to turn in the direction the field is rotating. en.wikipedia.org /wiki/Electric_motor   (2673 words)

Maintenacne World: Maintenance and Troubleshooting of Electric Motors Electrical unbalance usually indicates an electrical failure such as an open stator or rotor winding, an open bar or ring in squirrel cage motors or shorted field coils in synchronous motors. Electrical unbalance occurs when the magnetic attraction between stator and rotor is uneven around the periphery of the motor. Various electrical failures in the motor windings or connections manifest themselves in sparking and poor commutation. www.maintenanceworld.com /Articles/relianceelectric/maintenance-troubleshooting-electric-motors.htm   (3393 words)

Patent 4199718: Bearing wear detector for AC rotary electric instrument Accordingly, when three detecting coils are disposed in the axial clearance of the rotary electric instrument, the number of the rotor channels should preferably be selected from the multiple other than three. Generally, on designing an electric motor, the direction of the load power applied to the bearing or a power applied to the radial direction of the rotor is indefinite. By the way, in a rotary electric instrument commonly used, the direction of the axial load is changed due to a mounting angle against a cooperative machine, a weight of the load and the like. www.freepatentsonline.com /4199718.html   (3393 words)

Westclox Electric Clock Motor History Self-starting motor designed and made by Western Clock Co. Large rotor contained between plates, field coil located away from rotor to keep the bearings cool. Quote from February 19, 1929 annual report from the general manager to the Board of directors: "In accordance with appropriation made by the Board April 10, 1928, we acquired the patents and patent applications owned by William H. Greenleaf for $50,000, and an agreement was entered into whereby Mr. Does this relate to their use of Haydon electric motor patents? clockhistory.com /westclox/products/electric/motors   (1411 words)

PreGrant Publication Database Search Results: CCL/310/237 in PGPUB Production Database Axially sliding contact type of a commutator, a rotor including the commutator, and an electric motor having the rotor Commutator, and electrical motor and fluid pump using the same Commutators for electric motors and method of manufacturing same appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=0&p=1&f=S&l=50&Query=CCL/"310/237"&d=PG01   (94 words)

Rotor - Wikipedia, the free encyclopedia In radio, a rotor is an electric motor designed to turn a receiving antenna to match the direction of the received signal. In electrical engineering, the rotor of an electric motor or dynamo,is called an armature "Rotor" is a fictional character from the Sonic the Hedgehog universe Rotor (Sonic the Hedgehog) en.wikipedia.org /wiki/Rotor   (272 words)

Brushless DC electric motor - Wikipedia, the free encyclopedia Two subtypes exist: The three-phase AC synchronous motor has three electrical connections and the stepper motor has a lot of poles on to rotor and on the stator. In the 'outrunner' configuration, the radial-relationship between the coils and magnets are reversed; the stator coils form the center (core) of the motor, while the permanent magnets spin on an overhanging rotor which surrounds the core. A brushless DC motor (BLDC) is a DC electric motor that uses an electronically-controlled commutation system, instead of a mechanical commutation system. en.wikipedia.org /wiki/Brushless_motor   (600 words)

Cypher Machines Hagelin small machine together with packing case and electric keyboard. Three diferent electric keybords for ease of operation on the Hagelin's small machine. Sigaba cables for tandem operation and spare rotor box. www.geocities.com /ResearchTriangle/Node/3751/cypher.html   (40 words)

ipedia.com: Shaded-pole synchronous motor Article They work by using a squirrel-cage rotor and a split stator that has copper shorting rings placed on it so as to shade a portion of the stator's magnetic field enough to provide starting torque. Shaded-pole synchronous motors are a class of AC motor that uses single phase electric power to convert electric power to mechanical energy. They work by using a squirrel-cage rotor and a split stator... www.ipedia.com /shaded_pole_synchronous_motor.html   (134 words)

Brushless DC (BLDC) Motor A brushless DC (BLDC) motor is a rotating electric machine where the stator is a classic three-phase stator like that of an induction motor and the rotor has surface-mounted permanent magnets. On the contrary, in the brushless DC motor, the polarity reversal is performed by power transistors switching in synchronization with the rotor position. In this respect, the BLDC motor is equivalent to a reversed DC commutator motor, in which the magnet rotates while the conductors remain stationary. freescale.com /webapp/sps/site/overview.jsp?nodeId=02nQXGrrlPY7r8hv0V   (535 words)

Brushless DC electric motor A brushless DC motor is an electric motor that operates like a DC motor, but with the roles of the rotor and stator reversed. The motor has no brushes and no commutator in the traditional sense, but the role of the commutator is played by an electronic circuit, that switches the current to the different stator coils at the appropriate times. Some brushless DC drive circuits use the back EMF in the undriven coils to sense the rotor position, so they do not need the Hall effect sensors. www.sciencedaily.com /encyclopedia/brushless_dc_electric_motor   (288 words)

PreGrant Publication Database Search Results: CCL/29/598 in PGPUB Production Database Rotor of a permanent-magnet motor and corresponding manufacturing method Method for fabricating stator core and back yoke of outer rotor type motor in washing machine Brushless permanent magnet machine with axial modules of rotor magnetization skew and method of producing the same appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=0&p=1&f=S&l=50&Query=CCL/"29/598"&d=PG01   (379 words)

NASA Selects New Aircraft Technologies For Research Revolutionary Propulsion for Aeronautical Vehicles is the combined effort of the lead General Electric Aircraft Engines, Cincinnati, Ohio, and partners General Electric Corporate Research and Development, Schenectady, N.Y.; Lockheed Martin Tactical Aircraft Systems; Advanced Projects Research, Inc., La Verne, Calif.; Air Force Research Laboratory, Dayton, Ohio; Glenn and Dryden. And finally, the goal of the Variable Diameter Tilt Rotor flight experiment is to advance the technology readiness of a concept that optimizes the rotor configuration for both hover and cruise flight. Designed to power a new generation of commercial aircraft that will fly at five times the speed of sound, the Hypersonic Transport Propulsion System (HYPR) is the brainchild of Japan's New Energy and Industrial Technology Development Organization (NEDO), a branch of the Ministry of International Trade and Industry. www.spacer.com /news/aircraft-00a.html   (641 words)

AMPS - Electric Power - Electric Motors The rotor coils receive electric current via a so-called commutator, which is connected to a DC voltage through two brushes (hence the name). When electric current flows through a coil it creates a magnetic field with a strength proportional to the current's value, the number of windings of the coil and is inversely proportional to the coil's length. Electric motors have several designations such as 280, 300, 400, 480 and 600, which refer to the case length and also give an idea of their power and weight. www.amps-rc.com /Library/ElectricMotors/ElectricMotors.htm   (2965 words)

motor.html In the motor we built, the electrical energy stored in the battery is used to create magnetic fields that cause the rotor to turn. Converting electrical energy to mechanical energy is accomplished through the use of an electric motor. This is accomplished by winding turns of wire around an iron core, and connecting the wire across a voltage source, such as a battery. www.bae.ncsu.edu /programs/extension/4-h/activities/motor.html   (850 words)

Glossary of Electric Motor Terms The AC induction motor is named because the electric current flowing in its secondary member (the rotor) is induced by the alternating current flowing in its primary member (stator). Commutator: The part of a DC motor armature that causes the electrical current to be switched to various armature windings. The commutator also provides the means to transmit the electrical current to the moving armature through the brushes that ride on the commutator. www.electricmotorwarehouse.com /Glossary.htm   (2343 words)

Hysteresis motors (from electric motor) --  Encyclopædia Britannica power source that provides electric traction in a straight line, in contrast to rotary action of most motors; used in high-speed ground transportation, especially rail vehicles; stationary conductor (or third rail) fastened to road bed for power, which is carried to double stator fastened to vehicle to propel in linear direction. In special situations, the electric supply may come from a battery, as, for example, in an automobile. Self-contained devices that convert electrical, chemical, or nuclear energy into mechanical energy are called motors and engines. www.britannica.com /eb/article?tocId=45837   (2343 words)

Innovations: The power and efficiency of electric motors can be increased if there are sources of magnetic flux both on the stator and on the rotor. Although the prototype electric motors incorporating copper-based HTS materials are not yet suitable for commercial applications, the performance benefits that can result from the use of these materials has been satisfactorily demonstrated. HTS materials are especially beneficial for this type of motor because they are intrinsically hysteretic, implying that the magnetic flux cannot move freely throughout the material causing the magnetization and stator fields to be misaligned and, thereby, resulting in a large alignment torque. www.copper.org /innovations/2000/06/electric-motors-cuprate-supercondutors.htm   (2343 words)

Bell XV-3 The rotor tilt was controlled by an electric motor enclosed in a fairing at each wing tip. The Tilt Rotor, with its rotor facing straight into the airflow, had the potential to allow a much higher forward speed than would the compound helicopter. This concept used a more or less typical helicopter rotor to take off and land, then tilted the rotor forward to serve as a propeller for conventional forward flight. avia.russian.ee /vertigo/bell_xv-3-r.html   (2343 words)

Helicopter Components - Fuselage, Main Rotor, Empennage, Tail Boom, Tail Rotor, Power Plant A power plant is an electric motor that provides the power to spin the main rotor and the tail rotor. The tail rotor provides anti-torque which keeps the fuselage from spinning after it is lifted into the air. The main rotor is the wing of a helicopter. monte-thompson.rchomepage.com /helicopter-components.html   (2343 words)

City Electric Motor Company Inc. At City Electric Motor we offer new and used motors from all the major manufacturers providing Squirrel Cage, Vertical, Synchronous, DC, and Slipring (Wound Rotor) motors. City Electric Motor Company has been, and continues to be, a supplier of new and used electric motors since 1930. We have become one of the nation's largest electric motor shops and have built our reputation by offering quality and trust for over 75 years. www.cityelectricmotors.com   (161 words)

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