Abstract :
THE STANDARDS FOR TRACTION MOTORS list them as class B (1943 AIEE Standard No. 77), which provides that peak value by resistance shall not exceed 160 C for the armature and 170 C for the fields. Modern diesel-electric locomotive traction motors often exceed these limits by 20 to 30 C. Coupled with this are severe vibration conditions, dust, water, varying humidity, highly variable maintenance, and shock.
