Question

What is the formula to calculate the slip speed (Nslip) of 3 phase squirrel cage induction motor?​

Answer 1

Answer:

3 फेस स्क्विरल केज मोटर

N slip = Ns - Nr

Answer 2

Answer:

The formula of the slip in the induction motor is given below.

Slip = (Ns-Nr/Ns)*100

Explanation:

• Inherently, the squirrel cage induction motor is a fixed-speed motor, whose speed is controlled by the number of poles, and the frequency of the supply to which it is connected. A small speed change is noticeable as the load on the motor changes, as a result of the slip.
• The equation for motor speed is:
• $N=\frac{f*120}{p} -s$
• Where: N = motor speed in revs per minute
• f = frequency of supply to the motor in Hz
• p = number of poles on the stator
• s = slip of motor in revs per minute.

When the Value of Slip is ‘0’

• If the slip value is ‘0’ then the speed of the rotor is equivalent to revolving magnetic flux. So there is no motion among the coils of the rotor as well as revolving magnetic flux. So, there is no flux cutting act in the rotor coils. Therefore, emf will not be generated within rotor coils for generating rotor current. So this motor will not work. So, it essential to have a positive slip value in this motor and due to this reason, the slip will never become ‘0’ in an induction motor.

When the Value of Slip is ‘1’

If the slip value is ‘1’ then the rotor in the motor will be stationary

When the Value of Slip is ‘-1’

• If the slip value is ‘-1’ then the speed of the rotor in the motor is more comparable with the synchronously revolving magnetic flux. So, this is possible only when the rotor within the motor is turned in the revolving magnetic flux direction using the prime mover
• This is only possible when the rotor is turned in the direction of revolving magnetic flux by some prime mover. In this condition, the motor operates as an induction generator.

When the Value of Slip is >1

• If the slip value of the motor is greater than one then the rotor will turn in the opposite direction to the revolution of magnetic flux. So if the magnetic flux is revolving in the direction of clockwise, then the rotor will turn rotating in the anti-clockwise direction. So, the speed among them will be like (Ns + Nr). In braking or Plugging of this motor, the slip is greater than ‘1’ is attained to rapidly bring the rotor of the motor at rest.

Formula

The formula of the slip in the induction motor is given below.

Slip = (Ns-Nr/Ns)*100

• In the above equation, ‘Ns’ is the synchronous speed in rpm whereas the ‘Nr’ is the rotational speed in the rpm (revolution for each second)

Learn more about the slip of induction motor

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