If the engine runs jerkily - the speed fluctuates, the shaft jerks, the torque is uneven - the reason is a violation of the symmetry of the magnetic field or in the power supply. Let's figure out what to check.
Electrical reasons
- Breakage of the rotor “squirrel cage” rods.The classic cause of jerking in asynchronous motors is the torque pulsates with the sliding frequency.
- Breakage or poor phase contact - current imbalance.
- Voltage sag and fluctuationsin network.
- Frequency converter malfunctionor incorrect setting.
Mechanical reasons
- Uneven load from the mechanism.
- Slippage of the coupling or belt.
- Rotor touching the stator.
How determine
| Check | What it reveals |
|---|---|
| Currents in phases under load | Phase loss, imbalance |
| No-load current | Breakage of rotor rods |
| Voltage network | Sagging and oscillations |
| Checking the coupling/belt | Mechanical slippage |
Breakage of the rotor rods is an insidious malfunction: the engine seems to be running, but with jerking and overheating. It is determined by special methods during diagnostics, and is eliminated by repairing or replacing the rotor.
Does the engine jerk and run unevenly? Elektromotors engineers in Tashkent will identify the cause of jerking and restore smooth operation - contact us.