• Research Paper on:
    3 Phase AC Supplies' Use

    Number of Pages: 5

     

    Summary of the research paper:

    In five pages this paper discusses the 3 phase AC in terms of production, use, and also examines its mathematical implications. Three sources are cited in the bibliography.

    Name of Research Paper File: D0_JGA3phac.rtf

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    Unformatted Sample Text from the Research Paper:
    three-phase AC. Mathematical implications are included as well. THREE-PHASE AC According to Dr. Xing M. Wang, Faradays Law states that when a magnet rotates inside a  generator with three coils positioned at 120 degrees from each other then there is generated three-phase alternating currents (3-ph AC) (Wang 2001). However, Wang explains that by Amperes law  if there is a motor with three coils at 120 degrees and input the 3-f AC, there will be a rotating magnetic field. This will then cause an induced  current in the rotor that will then create a torque to rotate the rotor (Wang 2001). What this says is that three phase AC circuits have three independent AC power  sources which have the same amplitude as well as the same frequency. However, their phases are 2*PI/3 apart. In other words, an AC voltage is a rotating vector (its  x-component, vx = v cos(2*Pi*f*t), is what we detect). Then the 3-ph AC source has three rotating vectors, at 120 degrees from each other, and they all rotate at the  same frequency (e.g., 60 Hz in USA). Their sum is always zero (Wang 2001). TWO WAYS TO GET THREE-PHASE POWER The first way is to generate this power  directly. This would be by means of a three-phase alternator. This is the same way power companies produce it. The inherent problem in this is that for  those with no easy access to the electrical grid it takes a large diesel engine to drive the alternator. This method is what is used at construction sites or  in emergencies. Drawbacks to this method include cost, size and weight of the equipment, as well as the fact that the diesel engine must be running all the 

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