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When magnets are moved across a wire they indice a current at 90 deg. to the direction of counterclockwise rotation (the "right-hand rule"). When passed over a greater length of wire wrapped in this direction it will induce a greater electromagnetic force (current).
In the stator on your bike the magnets move (rotate) and the wire coils are fixed; in a car alternator the magnets are fixed and the coiled wires move.
Simpler Example:
If you have ever taken apart a lawnmower, there is a magnet on the flywheel and a coiled wire inside the solid state ignitor. When the magnet passes by the wire it induces a charge which fires the spark plug. Funny thing is that in a 4-stroke lawnmower the spark plug fires every rotation regardless of whether it needs to or not.
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The stator spins at a billion zillion miles per hour. This gernerates a warp drive (matter/anti-matter) field that enables us to reach speeds of warp 10 or better. And keeps the Klingons at bay too. WHOOOOOOA, where did that come from? Its too early, looking for some coffee!Comment
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So it is kind of like an Alternator in a car???Comment
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"Kinda" is the correct description. An alternator has the stator, coil and regulator/rectifier all in one convienient package for a mere fraction of the price. An alternator is also belt driven. The stator is connected via a drive shaft to the innards of your motor which keeps it spinning on its merry way. The stator cranks out 3 phase AC voltage which is in turn converted by the R/R into usuable DC volts. The R/R feeds the battery, to keep it charged, and also provides the "oomph" to the ignition system after startup. The stator/coil in your bike is cooled by an oil bath, while an alternator is air cooled. See how I can be after a couple cups of coffee. Never ask me a serious question when I am tired.
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Actually, the stator is static, ie, it does not move. The magnet is attached to the end of the crankshaft and spins around the stator. And, unlike an alternator in a car, the output of this AC Generator is dependant on the RPM of the engine. Spin the engine faster, more juice. The Reg/rect rejects this excess as heat, hence the fins on it.Comment
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My bag.......McConnell is correct in stating that the stator is the stationary item. Guess I should have gotten a 3rd cup of coffee.
Its the coil magnet that spins.
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Stator and rotor explained
This can be explained in a (hopefully) simple way:
Every electrical machine, like a motor or a alternator, has two basic parts. Something that moves, and something that doesn't move. The moving part is called a rotor, because it rotates. The other half is the stator, because it's static and bolted to the outside world.
The machine can absorb energy and drive something as in a motor, or it could have something else pushing it and thus giving us energy back as in an alternator. The machine looks exactly the same and uses the same terms, stator and rotor.
Energy is transferred to or from the machine due to the fact that a loop of cable moving in a magnetic field outputs a current, and vice versa. So what we need is a magnetic field and a moving wireloop, or maybe a static loop and a moving magnet. Depending on how we construct the machine we use the rotor or the stator, or both, to produce currents and magnetic fields.
In our GS-bikes, the stator has all the loops of electrical wire, and is placed stuck at the side of the crankshaft. The crankshaft rotates and has magnets on it. So the magnetic field moves around the wires, a current is created and we have something to charge our battery with. Of course, the amount of current created is dependant to the speed of the magnets moving. Thus, we need a rectifier and a regulator to charge correctly.
The stator is basically just three coils of wire spread out on a circle. Therefore, when the stator is working you can measure almost no resistance over one coil. If the stator is burned out, the wireloops will be cut and the resistance close to infinity.
This became a long post. Thanks for reading...
/ Henrik, owner of a '79 gs750e.Comment
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Thanks for the info guys
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wow that gave me a headache. LOL
another item, automotive alternators do not have actual magnets, they use a electromagnet, wich is a wire wraped in a circle and when electricity is passed through it, becomes a magnet.
Car alternators regulate there output by adjusting the amount of power aplied to the electromagnet and varying the "field".
little to no power aplied and you get little to no output.Comment
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