Motor Generator.

DATA ON MOTOR GENERATOR

RATING – CONTINIOUS (45 o AMBIENT):

MOTOR:

1500 volts12 amps1320 rpm15 kw

GENERATOR:

110 volts109 amps1320 rpm12 kw

WEIGHTS (APPROXIMATE):

Armature only225 kg

Complete machine920 kg

ARMATURE – DIMENSIONS:

MotorGenerator

Core diameter254 mm223.85 mm

Core length178.45 mm165.7 mm

Distance between bearingMax. 986.98 mm

Abutment faceMin. 986.60 mm

Overall length of shaft1147 mm

ARMATURE BANDING (MOTOR & GENERATOR):

Res – I – Glas tapeRes – I – Glas tape

U.T.S. minimum115 kg115 kg

RESISTANCE AT 20 o C IN OHMS (AVERAGE):

MotorGenerator

Armature winding4.400.66

Line series winding (1500 V)0.480.091

Shunt winding (110 V) - 45.3

110 V separately excited winding25 -

Complete winding1.500.035

POLE BORES (AVERAGE VALUES):

MotorGenerator

Main poles260.86 mm228.09 mm

Compoles274.83 mm231.90 mm

LINERS AT THE BACK OF THE POLES:

MotorGenerator

Main pole linerSteel-

Thickness2.0 mm-

Complete liner mat -Half hard brass

Thickness -1.25

COMMUTATORS:

MotorGenerator

Length of working face29 mm38 mm

Nominal new diameter241.3 mm190 mm

Minimum worn diameter217 mm173 mm

Mica thickness (nominal)0.8 mm0.8 mm

Mica undercutting0.8 to 1.25 mm0.8 to 1.25 mm

BRUSH GEAR:

MotorGenerator

Number of brush holders24

Number of brushes/ holder21

Size of brush - Length43 mm43 mm

- Width22.23 mm31.75 mm

- Thickness2 x 6.25 mm12.5 mm

Minimum length at which brush

Becomes inoperative16 mm16 mm

Brush gearEG 225IM 9101

(Morgan’s)(Morgan’s) or (RE59, Ringsdorff)

Brush rake9 o trailing10 o trailing

Spring pressure on new brush570 – 680 gm800 – 920 gm

Clearance between brush-holder Max 3.0 mmMax. 3.6 mm

And commutatorMin. 2.0 mmMin. 1.5 mm

Gap between earthing bar & 13.0 mm

Arcing plate ME14.0 mm

ARMATURE BEARINGS:

MotorGenerator

Type6308/C4NU 310/C3

(For MG 51, BXNH(For MG 51B & CW)

309/C4)

(For MG51CW)

Diametrical clearances0.028 to 0.0460.050 to 0.080 (For BX)

Of free bearing, 0.070 to 0.100.050 to 0.080 (For CW)

When new fit between0.045 to 0.0420.015 to 0.042 (For CW)

Inner race and shaft0.008 to 0.030.015 to 0.042 (For BX)

Fit between bearing0.024 mm0.025 mm

Cartridge and end shield0.002 mm0.002 mm

Clearance to interferenceboth in BX & CW -

LUBRICATION – ARMATURE BEARINGS:

Note:

Quantities indicated for lubricants are approximate and are for general guidance only. The actual quantity and interval between re-lubrication should be determined from experience and duty.

Make and grade:IOC – Servogem 3 or HP – Lithon 3

Quantity used for first fill Motor end – 75 gms and Generator end – 90 gms

Replenishment period6 months

Replenishment quantity Motor end – 14 gms and Generator end – 14 gms

MOTOR GENERATOR TYPE – 51 BY

Motor 20 H.P 1500 D.c 1320 RPM, 12 Amps, Generator out put 12 kw 110V 109 Amps
Weight 921 Length 1157mm
MOTOR / GENERATOR
Core Length
Diameter
Commutator
New Commutator Diameter
Condemming size of commutator
Segment Mica Thickness
Mica Under Cutting
BRUSH BOX
Number of Brush Holder
Number of Carbon brush in each brush holder
New carbon brush length
Width
Thickness
Condemming Size of Carbon brush
Carbon brush Grade
Spring Pressure / 177.45mm
254.00 mm
241.00mm
217.00mm
0.86 mm
0.80 to 1.25 mm
2
1
43.00 mm
22.20 mm
6.35 mm
16.00 mm
EG 225
570 to 680gms / 165.10mm
223.85 mm
190.00mm
173.00mm
0.84mm
0.80 to 1.25mm
4
1
43.00 mm
31.75 mm
12.70 mm
16.00 mm
RE59, EG14D, EG 98B
800 to 920 gms

M.C. Protective Resistance : 9.7