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!
Determine the slip of a four-pole induction
motor running at 1440 r/min when connected to
a 50 Hz supply.
                               !
Ns
=
120
x
50

=

1500
r/min


















4
Slip speed = synchronous speed – rotor speed
Slip speed = 1500 – 1440 = 60 r/min
!

Percentage slip = 1500 – 1440 x 100 = 4 %
       1500
Note: At standstill (when starting) the slip is
 100% but IF the machine could reach
 synchronous speed the slip would be zero.

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7.4.4

  • 1.
  • 2. !
  • 3.
  • 4. Determine the slip of a four-pole induction motor running at 1440 r/min when connected to a 50 Hz supply. ! Ns
=
120
x
50

=

1500
r/min 

















4
  • 5. Slip speed = synchronous speed – rotor speed Slip speed = 1500 – 1440 = 60 r/min
  • 6. ! Percentage slip = 1500 – 1440 x 100 = 4 % 1500 Note: At standstill (when starting) the slip is 100% but IF the machine could reach synchronous speed the slip would be zero.