What happens if a three phase induction motor is suddenly
single-phased while running? Which type of winding
connection will be affected?
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Answer Posted / stefan
#4
Usually when talking about "single-phased" motor, it means
that two of three phases are connected. In these cases, the
motor will slow down, and the phase currents for the
remaining phases will be increased. I don't know how much. I
am also not sure if the overload device would cut-off the
motor from power supply. Unless problem is not noticed, the
motor will most likely burn. When the motor is opened, you
should be able to see that 2 of the 3 phase windings are
black, and one is good looking (if motor is Y-connected)
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