http://motors.ceressoft.org/
http://www.mech.uwa.edu.au/NWS/How_to_do_stuff/motor/studentsmanual.pdf
2007-02-09 07:13:57
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answer #1
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answered by Poor one 6
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There are several basic principles to follow. If you understand them, you can tie things together.
1. Changing magnetic fields: this applies to either the magnet is moving or a conductor cutting across a magnetic field. A conductor (as part of an electric circuit) cutting across fixed magnetic fields will create (induce) an electric current in the circuit.
2. An electric current produces a magnetic field around it.
If you combine the 2 principles together, you can have 2 scenarios.
1. A current carrying conductor (usually a rod with a load) inside a fixed magnetic field arrangement (a simple DC motor). The magnetic field produced by the conductor go to "attract and repel" cycles and as a result, the conducting rod rotates. The current comes from an external source, eg, a battery.
This is the motor.
2. If the rod is made to move by mechanical means such as pushed by water or wind, inside a fixed magnetic field, a current is induced. The rod is part of an electric circuit. So a current begins to flow in the circuit. This is power generation.
An extra guideline to remember is that you will NEVER get something for nothing. You don't generate electricity without an external power source. You don't get mechanical motion without a supply of electric source.
Because we are combining magnetic field, current flow, and mechanical force, you can follow the left or right hand rules to do so.
2007-02-09 08:09:39
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answer #2
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answered by Sir Richard 5
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