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Project Report Practical 3

This experiment was conducted to observe the behavior of a synchronous motor under various load conditions. When load was applied, the motor's speed initially dropped but then increased back up to the synchronous speed until it reached overload, at which point it lost synchronism and was unable to maintain synchronous speed. Current drawn by the motor increased with load as it worked to compensate for speed loss. The synchronous motor was set up with a load machine and various measurements were taken as load was increased and the motor became overloaded.

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84 views1 page

Project Report Practical 3

This experiment was conducted to observe the behavior of a synchronous motor under various load conditions. When load was applied, the motor's speed initially dropped but then increased back up to the synchronous speed until it reached overload, at which point it lost synchronism and was unable to maintain synchronous speed. Current drawn by the motor increased with load as it worked to compensate for speed loss. The synchronous motor was set up with a load machine and various measurements were taken as load was increased and the motor became overloaded.

Uploaded by

Bafundi Cishe
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Project Report Practical 3:

This experiment was performed to determine how a synchronous motor behaves under load
conditions.

In the theoretical aspect when a synchronous motor is loaded the speed of the rotor will initially
drop but it will pick up again to sustain the synchronous speed. However if the motor is overloaded
it won’t be able to reach the synchronous speed due of the heavy load thus losing synchronism.

The machine will draw more current at loaded conditions because it is trying to compensate for the
loss of speed.

We set up the synchronous machine and an electro dynamometer to create the mechanical load.
The rotor is connected to a variable DC supply with an ammeter and voltmeter for the reading.
There is also a voltmeter and ammeter at the 3 phase supply. We did not use the second wattmeter
so the results were not as accurate as desired.

We are supposed to increase the load while the motor is running and at the same apply a direct
current until it reaches unity power factor. We must also increase the load until the motor is
overloaded and falls out of synchronism. This is called the pull out torque. A synchronous motor
which has been pulled out of synchronism should be disconnected from the supply as quickly as
possible.

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