Interturn short circuit is an insidious winding malfunction in which adjacent turns are shorted to each other due to insulation damage. The engine is still running, but it gets hot, loses power and is doomed to burn out quickly. Let's figure out how to recognize it.
Signs of an interturn short circuit
- Local overheating of part of the winding.
- Reduced power and torque.
- Increased current in one of the phases.
- The smell of overheated varnish.
- Buzz and vibration.
Why occurs
The main reason is aging or overheating of the winding wire insulation. Also, short circuits are provoked by overvoltage, vibration, moisture and abrasive dust.
How to determine
| Method | What it shows |
|---|---|
| Comparison of phase resistance | Underestimated resistance in the defective phase |
| Current measurement by phases | Current imbalance |
| Thermal imager | Local overheating |
| Special device (turn tester) | Accurate detection of short-circuit turns |
It is difficult to detect an interturn short circuit with a simple multimeter - the difference resistance is low. Therefore, special devices are used for accurate diagnosis. A full check is carried out during winding diagnostics.
What to do
An interturn short circuit cannot be partially treated - the damaged winding can only be restored by rewinding. The sooner the defect is identified, the lower the risk that the engine will burn out completely and damage the stator iron.
Is the engine heating up and losing power? Possible interturn short circuit. Elektromotors engineers in Tashkent will carry out accurate diagnostics and rewinding - leave a request.