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Motors and Generators.
Title: Motors and Generators.
Category: Science & Technology / Physics
Details: Words: 2088 | Pages: 8.9 (approximately 235 words/page)
Motors and Generators.
Magnetism and Moving charges
*Oersted had showed in the 19th century that a current carrying conductor was surrounded by a magnetic field
*Moving charges experience a force in a magnetic field
Factors that effect the magnitude of force
*F = ILBsinƒÖ
Van Allen Radiation belts - example pf motion of charged particles in a field
*Charged particles trapped inside the earth's magnetic field, which oscillate back and forth between the poles
*These charged particles experience …showed first 75 words of 2088 total…
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…showed last 75 words of 2088 total…is limited by supply - to vary below 50 Hertz, a change in frequency is needed
Principle of AC induction motor
*Changing magnetic field in electromagnet induces current in rods of squirrel cage
*Current in rod, generate their own magnetic fields - oppose magnetic field of electromagnet
*Repulsion of magnetic fields cause the cage to rotate - repeated 100 time a second
Why the majority of motors are AC induction motors
*Cheap
*Simple in design
*Less moving parts - low maintenance
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