Rotor: Testing and Inspection
Rotor60 A / 70 A Types
- Using ohmmeter, check for continuity between slip rings of rotor. If there is no continuity, replace rotor (1).
Resistance between slip rings of rotor (for 60 / 70 A types) 2.5 - 2.9 Ohm
- Using ohmmeter, check that there is no continuity between slip ring and rotor core. If there is continuity, replace rotor (1).
- Check slip rings for roughness or scoring. If rough or scored, replace rotor.
80 A Type
- Using ohmmeter, check for continuity between slip rings of rotor. If there is no continuity, replace rotor.
Resistance between slip rings of rotor (for 80 A type): About 2.9 Ohm
- Using ohmmeter, check that there is no continuity between slip ring and rotor. If there is continuity, replace rotor.
- Check slip rings for roughness or scoring. If rough or scored, replace rotor.
Using a vernier caliper, measure the slip ring diameter. If the diameter is less than minimum, replace the rotor.
Standard diameter of slip ring: 14.2 - 14.4 mm (0.559 - 0.567 in.)
Minimum diameter of slip ring: 12.8 mm (0.504 in.)