Contents: Checking the rotor ↓ Stator check ↓
Checking the rotor
1. Check if there is a break in the excitation winding.
Using an ohmmeter, measure the resistance between the slip rings.
- Nominal resistance - 3.9 - 4.1 Ohm
If resistance tends to infinity (i.e. the circuit is open) — replace the rotor.
2. Check if the excitation winding is shorted to ground.
Using an ohmmeter, measure the resistance between the rotor pole and the slip ring.
If the resistance is 0 (the circuit is closed), then replace the rotor.
3. Check the slip rings.
a) Check the working surfaces of the contact rings. They should not have any burrs or chips.
b) Using a caliper, measure the diameter of the slip rings.
- Nominal diameter - 32.3 - 32.5 mm
- Minimum allowable - 32.1 mm
If the diameter of the slip rings is less than the minimum allowable, replace the rotor.
Stator check
1. Check if there is a break in the stator winding.
Using an ohmmeter, measure the resistance between the terminals of the stator winding coils.
If resistance tends to infinity (i.e. the circuit is open) - then replace the stator.
2. Check if the stator winding is shorted to ground.
Using an ohmmeter, measure the resistance between the stator housing and the terminals of the stator winding coils.
If the resistance is "0" (i.e. the circuit is closed) - then replace the stator.
