the rotating stator ar tries to accelerate the rotor in one direction climate the other since of the solved magnetic field of the rotor and no torque is produced. The motor will vibrate v each cycle until it overheats


You are watching: Why can an induction motor never operate at synchronous speed

1. Minimize the rate of stator magnetic ar 2. Use an exterior prime mover to accelerate motor to synchronous speed3. Use damper windings
bars laid right into notches sculpted int he challenge of a sync. Motor"s rotor and then shorted out on each end by a big shorting ring -unidirectional since of non-zero median torque-alternate directions because torque averages to 0
why have to a voltage used to a sync. Engine be reduced for procedure of frequencies reduced than rated value?
when frequency is reduced, impedance will be reduced, therefore if voltage is not decreased then current will go over design and overheat windings
an induction motor constantly runs in ~ a speed less than synchronous speed due to the fact that the rotating magnetic field that is produced in the stator will generate flux in the rotor which will certainly make the rotor rotate. Due to lagging of flux current, the rotor will never ever reach that is rotating magnetic ar speed
it is provided to create a change rotor resistance -current flowing with the height of the bar has small leakage inductance-current flowing with the bottom the the bar has a huge leakage inductance
why is it crucial to alleviate the voltage applied to one inductor motor as electrical frequency is reduced?
as frequency is reduced, the motor rotates in ~ a higher speed therefore if us don"t alleviate voltage climate induction motor can burn out
to rise speed of rotor, voltage is increased yet if that is increased too lot then engine will become damaged
for a wound-rotor induction motor, starting can be accomplished at short currents by inserting extra resistance. This boosts the beginning torque and reduces the starting current
use a short circuit test where the rotor is locked so it can"t move, a voltage is applied to the motor and the result voltage, current, and power space measured
this is used to prevent sparking throughout neutral plane change and l di/dt voltages, yet the disadvantage is it can increase flux weakening
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