TM 55-2210-224-34
3-64. TRACTION MOTOR ASSEMBLY (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
Table 3-6. Traction Motor Data (continued)
ITEM
SPECIFICATION
Standard Impedance (60 cycle, ac, armature assembled, brushes lifted)
Exciting Field at 9 amps
Maximum
17.5 volts
Minimum
15 volts
Commutating Field at 24 amps
Maximum
18 volts
Minimum
16 volts
(60 Cycle, ac, armature removed)
Exciting Field at 20 amps
Maximum
18.8 volts
Minimum
17.2 volts
Commutating Field at 15 amps
Maximum
7.7 volts
Minimum
7.1 volts
Pole Bores (measured between centers of opposite pole faces)
Exciting Field
Maximum
11.76 in. (298.7 mm)
Minimum
11.74 in. (298.1 mm)
Commutating Field
Maximum
11.91 in. (302.5 mm)
Minimum
11.90 in. (302.2 mm)
Brush Data
Pressure per brush
7-7/8 to 8-1/2 lb (3.5 to 3.8 kg)
Size (new)
5/8 in. x 1-3/4 in. x 2 in. lg
(15.8 mm x 44.4 mm x 50.8 mm)
Minimum length (worn)
7/8 in. (22.2 mm)
Clearance (brush holder to commutator)
1/16 in. (1.58 mm)
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