/diy/ - Do It Yourself

>>1592585
The chosen number of turns relates to torque, not speed. Without load torque (here fan torque) all settings lead to the same shaft speed close to the synchronous speed (pic) and the slip is near zero. The synchronous speed only depends on the frequency and the number of poles. This is not a multi-speed motor. The actual fan speed is governed by the torque balance which results in a certain relative difference between the shaft speed and the magnetic field speed, called slip.