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Topic: Commutator (electric)

Related Topics

DC motor

Stator

Brushless DC electric motor

Electric motor

Rotor

Current (electricity)

Direct current

Stepper motor

Wind turbine

Squirrel cage rotor

Distributed generation

Electromagnetism

Linear motor

Armature

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	Electric motor
		The principle of conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the British scientist Michael Faraday in 1821 and consisted of a free-hanging wire dipping into a pool of mercury.
		Without a commutator to wear out, the life of a DC brushless motor can be significantly longer compared to a DC motor using brushes and a commutator.
		Commutation also tends to cause a great deal of electrical and RF noise; without a commutator or brushes, a brushless motor may be used in electrically sensitive devices like audio equipment or computers.
	www.jgames.co.uk /title/Electric_motor (4064 words)

	Commutator (electric) (Site not responding. Last check: )
		The commutator itself is the red and blue curved segments.
		A commutator is an electrical switch that periodically reverses the current in an electric motor or electrical generator.
		Commutators enable motors to run on, and generators to produce, direct current instead of alternating current.
	www.toolhost.com /Commutator_%28electric%29.html (304 words)

	Electric Scooters Care - Scooter Motors
		Generally, manufacturers are extremely careful to avoid this type of problem from occurring so the chances of you receiving an electric scooter with a motor defect are slim.
		If you need to clean the commutator, you will want to be very gentle, using emery paper.
		If you are not sure where to find small motor brushes, check with your local automotive shop that handles electrical parts or one where they rebuild generators and alternators.
	www.electric-scooters-electric-scooters.com /care_Scooter-Motors-Issue.htm (397 words)

	Electric Motor Commutator
		The commutator must have a smooth, defect-free surface that is concentric with the armature's shaft to provide efficient, reliable and quiet motor operation.
		This is because the commutator is not concentric with the rotational axis of the armature.
		The bright areas in the Top View image of the commutator occur because the commutator surface is not concentric with the rotational axis of the armature.
	www.k9ape.com /new/Commutator.html (707 words)

	Electric Motors and Generators - MSN Encarta
		Electric Motors and Generators, group of devices used to convert mechanical energy into electrical energy, or electrical energy into mechanical energy, by electromagnetic means (see Energy).
		A commutator of many segments used with a drum armature always connects the external circuit to one loop of wire moving through the high-intensity area of the field, and as a result the current delivered by the armature windings is virtually constant.
		The action of the commutator and the connections of the field coils of motors are precisely the same as those used for generators.
	encarta.msn.com /encyclopedia_761574329/Electric_Motors_and_Generators.html (1676 words)

	Electric dispatchers (Site not responding. Last check: )
		An Electric Dispatcher switching system is actuated by an electric clock mechanism and is designed to set in motion automatically, either simultaneously or consecutively, and to stop in the same way, a number of electric appliances or machines.
		Electric current is distributed through the connector structure to an electric wire system connected to technical equipment of a factory or institution in conformity with a time table previously dialed on a sectorized dial plate of the Electric Dispatcher.
		The Electric Kaleidoscopes are special Electric Dispatchers with magnets which operate and control automatically an one-minute program of luminous displays or luminous advertisement on buildings or special screens, or automatically control the function of electric devices or machines for the same period of time.
	www.sacnewsmonthly.com /invent/tilling_machine_sandy_soil/electric_dispatchers.html (3485 words)

	Small-sized direct current rotary electric appliance - Patent 4037125
		A rotary electric machine as defined in claim 5, wherein said brush is provided with a damper continuously disposed between portions of adjacent surfaces of said first and second elastic members, and arranged to absorb spontaneous vibrations of said first and second thin, planar elastic members.
		4, for example, wherein the commutator in a disc-shape is fixed on the rotor shaft substantially perpendicularly thereto so that the brushes may be in contact with the surface of the commutator in a direction substantially parallel thereto, thereby reducing the axial length of the commutator.
		Two contact pieces contacting with the commutator are formed integrally between the two elastic arm portions, and at an outside position where it is nearer to one of the arm portions to thereby widen the width of the brush and to shorten its length.
	www.freepatentsonline.com /4037125.html (3294 words)

	PowerPedia:Electric motor - PESWiki
		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 the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet.
		Commutation also tends to cause a great deal of electrical and RF noise; without a commutator or brushes, a brushless motor may be used in electrically sensitive devices like audio equipment or computers.
	peswiki.com /index.php/PowerPedia:Electric_motor (7597 words)

	Glossary of Electric Motor Terms
		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.
		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 (2343 words)

	motor (Site not responding. Last check: )
		The key to an electric motor is to then go one step further so that, at the moment that this half-turn of motion completes the field of the electromagnet flips.
		The commutator and brushes work together to let current flow to the electromagnet, and also to flips the direction the electrons are flowing in, at just the right moment.
		The contacts of the commutator are attached to the axle of the electromagnet, so they spin with the magnet.
	www.bergen.org /AAST/projects/Engineering_Graphics/pencil_sharpener/motor.html (679 words)

	Integrated fuel pump - Patent 6328538
		The integrated electrically driven fuel pump recited in claim 1 wherein said second open fitting end of said flow bore includes threads for engagement of one of a plug, for return of fluid back to said pump inlet, and a fitting, for return of fluid to a reservoir.
		The integrated electrically driven fuel pump recited in claim 1 and further comprising sealing structures adjacent said opening between said upper motor space for insuring that a fluid within said impeller space is isolated from said upper motor space.
		Where an electric fuel pump size reduction is to be had, to reduce its overall size, the electric motor brush structure suffers an intensified size reduction affecting its efficiency and longevity.
	www.freepatentsonline.com /6328538.html (2702 words)

	Ring cap for use on commutator in miniature electric motor for absorbing electrical noise/sound patent invention (Site not responding. Last check: )
		A rotor assembly for an electric motor, including: a rotor shaft, an armature, wire windings and a commutator, wherein the rotor assembly further includes a ring cap directly connected with the commutator.
		Electrical current flowing through the armature creates an alternating magnetic field within the housing that interacts with the magnetic field of the permanent magnets.
		However, in accordance with the instant invention, a ring cap 38 is provided on the commutator for acting a reservoir for absorption of any noise/sound generated from rotation of the commutator around the terminals.
	www.freshpatents.com /Ring-cap-for-use-on-commutator-in-miniature-electric-motor-for-absorbing-electrical-noise-sound-dt20051201ptan20050264126.php (2189 words)

	Reliance Electric DC Motor Brush Life White Paper - C-7090
		When electric current is passed between the carbon and copper in the presence of water vapor, a microscopic layer of copper carbon composite or film, is formed.
		In a DC motor, commutation is the process of periodically reversing the current flowing in individual armature coils in order to maintain unidirectional torque as the armature coils move under alternate field poles.
		Brush probes that contact the commutator and provide a voltage signal equal to the armature voltage and mechanical devices that move with the brush spring and close a contact are also available on some motors to tell you that it is time to change brushes.
	www.reliance.com /prodserv/motgen/c7090 (3515 words)

	Generating Electrical Current - Succeed in Physical Science
		Electrical current can be generated by means of moving wire through a magnetic field.
		An electric motor is very similar to a generator, except that power is provided to turn the rotors.
		The difference between an AC and a DC generator is that the AC generator uses slip rings to transfer the current to the electrical circuit, while the DC generator uses a split-ring commutator.
	www.school-for-champions.com /science/electgeneration.htm (1336 words)

	commutator (electric)
		commutator (electric) is one of the topics in focus at Global Oneness.
		For an electrical switch that periodically reverses the current see commutator (electric) In mathematics, the commutator gives an indication of how poorly a certain binary operation fails to be commutative.
		The subgroup generated by all commutators is called the derived group or the commutator subgroup of G. Note that one must consider the subgroup generated by the set of commutators because in general the set of commutators is not closed under the group operation.
	www.experiencefestival.com /commutator_electric (342 words)

	Brushless Electric Motors
		The commutator is the copper part at the back of the armature which is also broken into segments.
		All this works when an electric current is applied to the commutator, which electrifies one section of the armature at a time, which creates a magnetic field in the core, which reacts with the permanent magnets mounted on the case.
		This commutator function is now built in to the electronic speed controller, which also converts the DC current from the battery into AC.
	www.flyelectric.com /ans.brushless.html (594 words)

	Commutators
		TEMCO is capable of handling commutators ranging in size from 5" to 12' in diameter.
		By using our handy online commutator quote form, you can provide us with all the information we'll need to design your commutator in a matter of minutes.
		TEMCO has been producing high-end commutators for over 60 years, and our current commutator manufacturing capabilities include commutators built to existing model specs, new commutators with all-new steel parts, and new commutators with wire-banded assembly and Mica V-Rings.
	www.elecmat.com /electrical-copper/commutator.htm (252 words)

	Dan's Motorcycle Electric Starters
		The power needed to work the little electric magnet is small so a regular sized wire is used to power it from a switch on the handlebar.
		Now I could go into turning the commutator (In a lathe) and undercutting the Mica gap (Hack saw blades work good, go down about 0.3mm or.012", and chamfer the edges a bit so the brushes don't get damaged.) but unless you are rebuilding lots of starters, you just will not need to do this.
		If you had an electric starter, it would have been made out of the best materials available and you would be using it a lot.
	www.dansmc.com /electric_starters.htm (2686 words)

	cars - Electric motor
		The negative aspect is the maintenance and reliability problems caused by the commutator, and as a result such motors will rarely be found in industry but are the most common type of AC supplied motor in devices such as food mixers and power tools which are only used intermittently.
		For higher-power applications where a polyphase electrical supply is available, the three phase (or polyphase) AC induction motor is used.
		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.
	www.carluvers.com /cars/Electric_motor (3352 words)

	Electric Motors -- AC Motors -- DC Motors
		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.
		commutator, and as a result such motors will rarely be found in industry but are the most common type of AC supplied motor in devices such as food mixers and power tools which are only used intermittently.
		All induction motors are characterized by the fact that when no load is applied to the motor, the rotor rotates at a slightly slower rate than the mains frequency (or an integer submultiple of the mains frequency).
	www.edinformatics.com /inventions_inventors/electric_motors.htm (3589 words)

	The Electric Boat Association (EBA)
		Cedric explained that use of improved magnets make his new Indian made motors are more efficient than previous Lynch motors and how improvements to the commutator and brush design have made a significant reduction in noise.
		The Mary Gordon was built in 1898 by Sergeants of Eel Pie Island on the Thames of teak planking on oak frames.
		At that time electric boats or launches were very popular on the Thames and at 52 ft in length The Mary Gordon was one of the largest, she could carry 75 adults or 120 children in comfort.
	www.electric-boat-association.org.uk (319 words)

	Howstuffworks "How Electric Motors Work"
		To understand how an electric motor works, the key is to understand how the electromagnet works.
		The "flipping the electric field" part of an electric motor is accomplished by two parts: the commutator and the brushes.
		The diagram at the right shows how the commutator and brushes work together to let current flow to the electromagnet, and also to flip the direction that the electrons are flowing at just the right moment.
	science.howstuffworks.com /motor.htm/printable (1508 words)

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