As far as the formulas I know, you have to provide either one of the values to calculate the other two. Because,
1. The number of poles, P = 120*f / Ns, f – frequency, Ns – Synchronous speed
2. Synchronous speed, Ns = 120 * f/P, same above formula or using slip speed Ns = N + s
3. Slip speed, s = Ns – N, N – rotor speed
You have to assume one of the values to calculate the other.
Let’s consider a four pole induction motor.
1. Number of poles = 4
Then we can calculate synchronous speed and slip speed
2. Synchronous speed, Ns = 120 * f/P
f= 50hz, p = 4
120*50/4 = 1500 rpm
3. Then the slip speed = 1500 – 1400 =100rpm
As far as the formulas I know, you have to provide either one of the values to calculate the other two. Because,
1. The number of poles, P = 120*f / Ns, f – frequency, Ns – Synchronous speed
2. Synchronous speed, Ns = 120 * f/P, same above formula or using slip speed Ns = N + s
3. Slip speed, s = Ns – N, N – rotor speed
You have to assume one of the values to calculate the other.
Let’s consider a four pole induction motor.
1. Number of poles = 4
Then we can calculate synchronous speed and slip speed
2. Synchronous speed, Ns = 120 * f/P
f= 50hz, p = 4
120*50/4 = 1500 rpm
3. Then the slip speed = 1500 – 1400 =100rpm