ROTOR RESISTANCE STARTERS
o
The
easiest method of starting wound rotor (slip-ring) induction motors is to
connect some extra resistance in the rotor circuit as shown in fig.
o
Connection
of extra resistance in the rotor circuit decreases the starting current and at
the same time increases the starting torque.
o
As the
motor starts rotating the extra resistance is gradually cut out.
o
When the
motor attains rated speed the resistance is fully cut out.
When the motor attains rated speed the
resistance is fully cut out and the slip ring terminals are short circuited.
The motor now operates on its own
characteristics which give rise to maximum torque at a low slip.
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