Question

A 5 HP, 3 phase, 400v star connected squirrel cage induction motor meant to drive a milling machine. At starting, the machine takes the current about______​

Answer 1

At starting, the machine takes the current about 6.33 Amp

Explanation:

Data given:

The power of 3 -phase squirrel cage induction motor = 5 HP

Voltage = 400 V

Solution:

For 3- Phase induction motor:

    Power = √ 3VL IL Cos θ

Power Factor Rating of I M , Cos θ = 0.85

     Power = √3 x 400 x IL  x 0.85

     0r  5 x 746 = √3 x 400 x IL  x 0.85

     or      3730  = 588.88 x IL

                    IL  =  3730/ 588.88

Line current  = IL = 6.33 Amp