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Topic: Electric motor

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  Electric Motors - Electric Motor Manufacturers - Electrical Motors
Electric motors are used in many applications and many industries instead of fuel engines because they are cleaner and less expensive to run.
Electric motors are also a good alternative to fuel engines in many cases because they release no exhaust or emission, which solves a health hazard.
When selecting electric motors, take into consideration the size of the space where the electric motors will have to fit, the requirements for power input and motion output, the desired speed of the motion to be produced, the type of current to be used and the overall cost limits.
www.iqsdirectory.com /electric-motors   (1683 words)

 PowerPedia:Electric motor - PESWiki
The modern DC motor was invented by accident in 1873, when ZĂ©nobe Gramme connected a spinning dynamo to a second similar unit, driving it as a motor.
Generally, the rotational speed of a DC motor is proportional to the voltage applied to it, and the torque is proportional to the current.
In all BLDC motors, the stator-coils are stationary.
peswiki.com /index.php/PowerPedia:Electric_motor   (7631 words)

 Electric Motors - Introduction to Electric Motor Service Factors
Increases in electric motor temperature are measured by the resistance method in the temperature rise table.
Electric motors feature a nameplate temperature rise, which is always expressed for the maximum allowable load.
But the second electric motor will have to be larger than the first in order to dissipate the additional heat it generates at 125% load.
www.electricmotors.machinedesign.com /guiEdits/Content/bdeee1/bdeee1_4.aspx   (322 words)

 Electric Motors - Sizing and Dimensions
Choose a motor for which the load is 75 to 100% of the motor's rated capacity.
The motor must be able to start the load from dead still, accelerate it to operating speed, and then continue applying enough torque to maintain speed.
Motors in these applications can operate at or near their rated capacities because the temperature rise is controlled.
www.electricmotors.com /sizing.html   (1481 words)

  Method of regulating an electric motor and corresponding electric motor - Patent 7038420
It is known for such electric motors to be controlled as a function of a temperature measured on the internal combustion engine, preferably in association with regulation of the real speed of the electric motor as measured by means of suitable sensors, such as Hall effect sensors.
In a particular embodiment, the setpoint is a pulse voltage setpoint having a duty ratio representative of a percentage of a nominal speed of rotation of the electric motor, the setpoint being converted to correspond to a mean voltage prior to calculating the divergence between the setpoint and the measured value.
Also preferably, the method includes steps of measuring current at the terminals of the electric motor and of feeding the electric motor in such a manner as to maintain the measured current at a value that is less than or equal to a predetermined current threshold.
www.freepatentsonline.com /7038420.html   (1598 words)

  Electric motor - Wikipedia, the free encyclopedia
Generally speaking the rotational speed of a DC motor is proportional to the voltage applied to it, and the torque is proportional to the current.
A stepper motor may also be thought of as a cross between a DC electric motor and a solenoid.
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.
en.wikipedia.org /wiki/Electric_motor   (5340 words)

 Improving Motor Efficiency
Electric motors consume 64 percent of the electricity produced in this country.
Although they are generally efficient, motors are often run at lowered efficiency because the motor size is not matched to the horsepower requirements of the task.
Since motors run most efficiently near their designed power rating, it is good practice to operate between 75 percent and 100 percent of full load rating.
www.psnh.com /Business/SmallBusiness/Motor.asp   (476 words)

 The blacksmith's motor   (Site not responding. Last check: )
Power was supplied from a stationary battery to the moving electric locomotive, using the rails as conductors for the electricity.
The electricity source for the magnets was a galvanic battery of the type developed by Volta.
He built a model electric train that operated on a circular track; power was supplied from a stationary battery to the moving electric locomotive using the rails as conductors to transmit the electricity.
www.memagazine.org /backissues/july99/features/blacksmith/blacksmith.html   (2263 words)

 07.23.2003 - Physicists build world's smallest motor using nanotubes and etched silicon
The entire electric motor is about 500 nanometers across, 300 times smaller than the diameter of a human hair.
The electrostatic motors represent a milestone in nanotechnology, and prove that nanotubes and other nanostructures several hundred times smaller than the diameter of a human hair can be manipulated and assembled into true devices.
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.
www.berkeley.edu /news/media/releases/2003/07/23_motor.shtml   (1394 words)

 Glossary of Electric Motor Terms
Motor is located in the air stream to cool the motor.
The part of the motor that houses the bearing supporting the rotor and acts as a protective guard to the internal parts of the motor.
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).
www.electricmotorwarehouse.com /Glossary.htm   (2333 words)

 Cooled electric motor protecting components from coolant - Patent 5081384
A cooled electric motor as set forth in claim 2, wherein said electric motor further comprises a connection box and a rating plate, said bearing shields having attachment surfaces for securing thereto said connection box and said rating plate.
The electric motor is used in the higher protection systems where components of a machine must be so protected against foreign bodies or the ingress of water that it results in not enough cooling air being supplied to the winding heads of the coils in the stator.
Formed on the motor casing are feet 11 having holes, through which screws extend attaching the motor to the foundation, and an eyelet 12 for the insertion of a crane hook.
www.freepatentsonline.com /5081384.html   (2018 words)

 Electric Vehicles USA, Inc. - DC Electric Motor Info - DC Electric Vehicles and Home Power Supplies   (Site not responding. Last check: )
Permanent magnet motors are very efficient, but only in a very narrow rpm band, and quickly lose their efficiency in the varying speeds of normal driving.
The Horsepower ratings for Electric Motors are a little deceiving, Electric Motors have about 3 times the torque than gas motors and the peak horsepower is basically limited only to the controller used.
The motor is wired so that the negative output side of the controller goes into the field winding, the field winding output is shorted to the armature, and the other armature connection is hooked to the positive side of the battery pack.
www.cloudelectric.com /generic.html?pid=66   (1129 words)

 electric motor — Infoplease.com
The traditional electric motor consists of a conducting loop that is mounted on a rotatable shaft.
In an alternating current (AC) motor, the current flowing in the loop is synchronized to reverse direction at the moment when the plane of the loop is perpendicular to the magnetic field and there is no magnetic force exerted on the loop.
The speed of AC induction motors is set roughly by the motor construction and the frequency of the current; a mechanical transmission must therefore be used to change speed.
www.infoplease.com /ce6/sci/A0834219.html   (621 words)

 icWales - Welsh car team pioneer electric dream   (Site not responding. Last check: )
Imagine an electric car that produces hardly any noise, no air pollution, and is as fast as a Ferrari.
It is hard not to laugh when recalling Sir Clive Sinclair's C5 electric three-wheeler, which was supposed to be the ideal urban runabout, but proved a catastrophic flop.
There are no gears - the motor provides enough torque at one revolution per minute to put a vehicle into motion - and it spins at up to 2,500rpm.
icwales.icnetwork.co.uk /0100news/0200wales/tm_objectid=15580050&method=full&siteid=50082&headline=welsh-car-team-pioneer-electric-dream-name_page.htmlmick   (413 words)

 Industrial Electric Motor Sales, Repair, Rewind Service
Electric Motor Sales over the Internet can possibly result in selling thousands of models of electric motors, inverters, variable frequency drives and electric motor products at discount prices.
Electric Motor Repair often entails providing mechanical and motor repair services to a broad array of industrial and commercial accounts including printing, pulp and paper, power and manufacturing in general.
Motors need to be rewound for two reasons: because excess heat has damaged the insulation so that electricity passes from winding to winding without going thru them all, or else because the winding has been cut in a place that is not near the end of the coil.
www.emservicenter.com   (272 words)

 Electric motor basics
This characteristic is constant for a motor regardless of the voltage level and is known as the torque constant or Kt and expressed as in/oz/amp or mm/N/amp.
However losses due to electrical resistance in the wire, the steel in the motor reacting against changes in magnetic fields and parasitic drag in the moving parts mean a motor is less than 100% efficient.
Also a motor remaining at high temps may fail because the modern adhesives use to construct it suffer heat induced fatigue and the magnets separate from the casing or shaft.
www.fastelectrics.com /elecmotorbasics.htm   (1086 words)

 Alternative Fuels Data Center: Electric Vehicles   (Site not responding. Last check: )
Although electricity production may contribute to air pollution, an EV is a zero emission vehicle and its motor produces no exhaust or emissions.
Electric vehicles have been used in several fleet applications including airline ground service and baggage handling, internal transit for national parks, and university and business campus security.
Electric batteries have a limited number of charging cycles (the number of times a battery can be charged and discharged) and will typically need to be replaced within 3-6 years.
www.eere.energy.gov /afdc/afv/elec_vehicles.html   (984 words)

 Electric Motors & DC Motors
The Electric Motors Reference Center, from Machine Design, is designed to provide design engineers with the information they need to specify or purchase electric motors including: AC motors, DC motors, stepper motors and servo motors.
Electric motors, both ac motors and dc motors, come in many shapes and sizes.
In any case, electric motors should be selected to satisfy the dynamic requirements of the machines on which they are applied without exceeding rated electric motor temperature.
www.electricmotors.machinedesign.com   (312 words)

 Electric Motor Rebuilders, Inc.
If a motor with a turn to turn fault short stays in service circulating currents may produce hot spots and the ground wall insulation will eventually burn up causing a shut down.
If your company has had an electric motor or generator repaired only to have the machine run hot and burn up after a short operating time, the most likely cause was a damaged stator lamination core.
Water injection temperature controlled burning of electric motor & generator stators alleviate the damage caused if the oven has a thermal runaway, simply put the water injection system keeps the temperature at the preset levels overcoming the potential of lamination core iron damage due to extreme temperatures, in some cases up to 1500 deg.
www.electricmotorrebuilders.com /Service.cfm   (541 words)

 ELECTRIC MOTOR SERVICE CENTER Inc. Electric Motor Principles   (Site not responding. Last check: )
When the stator in an electric motor is energized with AC power, the poles of the stator reverse and change polarity (direction of north and south).
Maximum torque in a motor is developed when the rotor is at 70% to 80% of synchronous (stator) speed.
This motor develops two speeds from one winding by connecting the pole structure as straight pole and consequent pole.
home.comcast.net /~sagnetworks/motors.htm   (1697 words)

 Electric bicycles, electric bikes, electric bicycle, electric bike
Electric Bicycles that are powered by a motor of 750 watts or less and having a top speed that does not exceed 20 mph are considered a bicycle, and not a motor vehicle.
Because of these changes, electric bike riders are exempt from insurance, registration and driver's license requirements that are imposed on motor vehicles.
The many advantages offered by electric bicycles, as well as the improvements in electric bicycle technology, are certain to make them very popular.
www.fiveflagsmotorbikes.com /ElectricBicycles.htm   (210 words)

 electric motor   (Site not responding. Last check: )
In a two-pole motor, if the electromagnet is at the balance point, perfectly horizontal between the two poles of the field magnet when the motor starts, you can imagine the armature getting "stuck" there.
It is possible to have any number of poles, depending on the size of the motor and the specific application it is being used in.
The armature in this motor is a set of thin metal plates stacked together, with thin copper wire coiled around each of the three poles of the armature.
www.bergen.org /AAST/projects/Engineering_Graphics/pencil_sharpener/inside.html   (473 words)

 What are Electric Motors?
Electric motors are a technological device than generates mechanical energy from electrical energy.
The uses of electric motors are usually for appliances and power-generated equipment.
Electric motors that are power consuming are more costly.
www.electric-motors.org   (150 words)

 Electric Bikes | Folding Bicycles | Powered motor kits | Scooters
Electric bikes, electric powered tricycles and electric bicycle motor kits let you enjoy the outdoors, and provide the fun you deserve.
It is in general less expensive to purchase a pre-built ebike but the electric assist motor kit allows you to use the bike you already know and love.
Electric scooters are usually used for commuting to work (short distances only) or for fun.
www.nycewheels.com   (712 words)

 Electric motor
The motor armature is 20-penny nail pushed into a hole in a large cork.
The terminals of the armature winding are scraped bare of insulation and fastened to the glass tube so as to form what is known as the commutator.
It is by means of the commutator that electrical connection is established with the revolving armature coils.
bizarrelabs.com /motor1.htm   (469 words)

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