Slip is a fundamental concept for an asynchronous motor. Without it, the machine simply would not work. Let's understand what it is in simple words.
What is slip
The magnetic field of the stator rotates at a synchronous speed (for example, 1500 rpm). The rotor always spins a little slower - say 1450 rpm. The difference between them is called slip. Usually it is several percent.
Why is it needed
It is the lag of the rotor from the field that induces currents in it and creates torque. If the rotor caught up with the field, the currents would disappear and the torque would disappear. Therefore, an asynchronous motor fundamentally cannot rotate synchronously with the field under load.
How slip changes with load
| Load | Slip | Revolutions |
|---|---|---|
| Idling | Minimum | Close to synchronous |
| Nominal | Small (2–5%) | Nominal |
| Overload | Increasing | Falling |
What does increased slip indicate?
If the engine under load loses a lot of speed (high slip) - this is a sign of overload or malfunction, such as broken rotor rods. Such defects are revealed by diagnostics, and eliminated by repair of an asynchronous motor.
Does the engine lose speed under load? Elektromotors engineers in Tashkent will identify the cause - contact us.