why motor starting current is High ?
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Answer Posted / ta
What the persons above said is true mathematically.
If you look at it as in theory, we know a DC Machine can act
as a Motor as well as a Generator. So as the Current is
supplied to the conductors present in a magnetic field, a
Force starts to act on the current carrying conductor. This
current forces the Rotor to rotate. At this time the only
Voltage is the supplied Voltage. As soon as the motion
starts there has to be an Emf induced which directly depends
on the speed of rotor. This induced voltage is called
Counter EMF or the Back EMF, which is absent at the instance
the motor is supplied a current. This EMF in effect acts
opposite to the Supplied Voltage. So whatever Drop of
volatge is in The resistance of Rotor wires is due to the
Total Supplied Voltage and Resistance is pretty low so the
current at the start is very high
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