By Tennis C.
Tennis C. crucial electronics for software program people (ISBN 0977616681)(Pragmatic Bookshelf, 2007)
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Sample text
The brushes consist of small “fingers” that contact the rotating shaft. Sometimes one or more of the fingers may temporarily lose contact with the rotating shaft for a moment. In normal operation it’s okay as the rest of the brush is still in contact with the shaft. But when the generated voltage becomes very high (near 1000V) it can cause a spark between a brush finger and the shaft when contact is lost. This sparking isn’t good for the brushes or the DC motor, which means that it becomes expensive to utilize a DC motor at high voltages (near 1000V).
Over time, the power requirements of your house change as electrical appliances turn on or off. This means that the resulting alternating current generated by this voltage may be higher or lower at any given point in time. If no electricity is being used, then no current flows into your house. But the 230V AC is still present. AC Waveforms While a DC voltage doesn’t change, AC voltage is always alternating back and forth in a fixed way. The voltage is constantly changing from some positive value, down to 0, then down further into a negative value.
As the commutator turns, the rotating coil of wire in the magnetic field induces a current in the wire and that current begins to flow. As the coil passes through the peak value, the current begins to come back down towards zero again. This is also exactly the same as AC. However, at the 180 degree point things change. With the DC commutator, at the 180 degree spot there is a small gap between the two sides of the commutator. As the commutator passes through this break, the current flow is zero.