They're simpler than alternators and thus more reliable, but a magneto the size of an alternator won't be able to produce nearly as much current as the alternator, making it useless in passenger cars. A magneto simply can't supply enough amps to charge a 12V battery capable of supporting your lights Contact online >>
They''re simpler than alternators and thus more reliable, but a magneto the size of an alternator won''t be able to produce nearly as much current as the alternator, making it useless in passenger cars. A magneto simply can''t supply enough amps to charge a 12V battery capable of supporting your lights, stereo, engine management and electric windows.
The major point that differentiates between an alternator and generator is that in an alternator, the magnetic field rotates around a stationary armature and in generator; the armature rotates inside a stationary magnetic field.
A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current. Unlike a dynamo, a magneto does not contain a commutator to produce direct current.
Defining the Alternator. An alternator is an electrical generator converts mechanical energy into alternating current (AC). Unlike generators that create a stationary magnetic field, an alternator creates a rotating magnetic field, which induces an electromotive force within stationary wire coils.
It is basically an electrical generator that has been tuned to create a periodic high-voltage pulse rather than continuous current. An electrical generator (or a magneto) is the reverse of an electromagnet. In an electromagnet there is a coil of wire around an iron bar (t
A magneto is device similar to an alternator for creating electrical energy. Many small gas engines, including several road worthy motorcycles, use them to generate electrical energy. They can be used for supplying spark or charging a battery.
I am guessing that efficiency (i.e. cost or power demand) plays the major role in deciding to use a magneto or an alternator. When is a magneto more efficient than an alternator? Is there some general rule of thumb used to decide which to use on an application?
Interesting fact: magnetos are used in some race cars in lieu of an alternator as part of a crank-fired spark plug setup. this is because this setup creates much less parasitic drag on the engine, thus freeing up more of the horses to turn the wheels.
A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current. Unlike a dynamo, a magneto does not contain a commutator to produce direct current. It is categorized as a form of alternator, although it is usually considered distinct from most other alternators, which use field coils rather than permanent magnets.
Magnetos were used for specialized isolated power systems such as arc lamp systems or lighthouses, for which their simplicity was an advantage. They have never been widely applied for the purposes of bulk electricity generation, for the same purposes or to the same extent as either dynamos or alternators. Only in a few specialised cases have they been used for power generation.
Production of electric current from a moving magnetic field was demonstrated by Faraday in 1831. The first machines to produce electric current from magnetism used permanent magnets; the dynamo machine, which used an electromagnet to produce the magnetic field, was developed later. The machine built by Hippolyte Pixii in 1832 used a rotating permanent magnet to induce alternating voltage in two fixed coils.[2]
The surviving machine has an applied field from four horseshoe magnets with axial fields. The rotor has ten axial bobbins. Electroplating requires DC and so the usual AC magneto is unworkable. Woolrich''s machine, unusually, has a commutator to rectify its output to DC.
Most early dynamos were bipolar[note 1] and so their output varied cyclically as the armature rotated past the two poles.
To achieve an adequate output power, magneto generators used many more poles; usually sixteen, from eight horseshoe magnets arranged in a ring. As the flux available was limited by the magnet metallurgy, the only option was to increase the field by using more magnets. As this was still an inadequate power, extra rotor disks were stacked axially, along the axle. This had the advantage that each rotor disk could at least share the flux of two expensive magnets. The machine illustrated here uses eight disks and nine rows of magnets: 72 magnets in all.
The rotors first used were wound as sixteen axial bobbins, one per pole. Compared to the bipolar dynamo, this did have the advantage of more poles giving a smoother output per rotation,[note 2] which was an advantage when driving arc lamps. Magnetos thus established a small niche for themselves as lighting generators.
The Belgian electrical engineer Floris Nollet (1794–1853) became particularly known for this type of arc lighting generator and founded the British-French company Société de l''Alliance to manufacture them.
The de Méritens magneto generator illustrated shows the ''ring wound'' armature. As there is now only a single rotor disk, each horseshoe magnet comprises a stack of individual magnets, but acts through a pair of pole pieces.
Dynamos and alternators require a source of power to drive their field coils. This could not be supplied by their own generator''s output, without some process of ''bootstrapping''.
The invention of the self-exciting field by Varley, Siemens & Wheatstone removed the need for a magneto exciter. A small residual field in the iron armature of the field coils acted as a weak permanent magnet, and thus a magneto. The shunt wiring of the generator feeds some of its output current back into the field coils, which in turn increases output. Because of this, the field ''builds up'' regeneratively, though this may take 20–30 seconds to do so fully.[10]
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