12 pulse package
Posted 24 February 2005 - 09:08 AM
A three phase rectified voltage results in a positive "pulse" of current on each phase and a negative "pulse" of current on each phase in each cycle. This results in six "pulses" per cycle. There are harmonics associated with these pulses.
The three phase supply has angular displacements of 120 degrees.
A 60 degree phase shifting transformer can be used to add an additional three phases offset by 60 degrees. This results in a six phase supply.
A six phase rectifier produces twelve "pulses" of current on the supply, and is used as a means of reducing the harmonic currents on the supply.
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Posted 24 February 2005 - 03:04 PM
What should the field control on a DC motor set the field to when the
>motor trips on Over-voltage or Over-speed. Why?
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