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Thursday, March 26, 2009

Calculate the Full Load Current of AC Motor

Figure 2 is the menu of the data which defines the electrical and
the thermal model of the motor.


Figure 2: Menu of Essential Motor Data

To fill in the data, we have used the stated voltage and horse
power to calculate the full load current:


We used 6 times full load current as the locked rotor current and
calculated the full load speed using one percent slip at full load.
Depending on the class and application of the motor, the locked
rotor torque can take on values of 0.8, 1.0, or 1.2. The value of
0.8 is the appropriate value for a pump motor.

Source pdf
http://www.selinc.com/techpprs/6023.pdf

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