Nagpur Motors manufactures standard 3-phase squirrel cage induction motors as per IS 325 and IEC 44. The present range is IEC frame 63 to 180 L in different polarities.
Standard Specification :
  • Voltage 415 Volts +/- 10%
  • Frequency 50 Hz +/- 5%
  • Insulation Class F (Temperature Rise limited to class B)
  • Ambient Temp. 45 Degree C.
  • Altitude 1000 Mtrs
  • Protection IP 44 (Terminal Box IP 54)
  • Mountings B3-Foot, B5-Flange, B14-Face
Construction Features
Motors in frame sizes 90 to 180 L have for close-grained grey cast iron motor housings and end covers. Frame 90 motors can be supplied with Alluminium motor housings on request. Motors in frame 71 and 80 are supplied with Pressure Die Cast Alluminium housings as a standard feature. However, motors in these two frames can also be supplied with Cast Iron housings on request. Motors in frame 63 are available with Pressure Die Cast motor housings as well as end covers.
Terminal Box Position
Motors in frame 90 to 160 L have terminal box on right hand side, which can be changed to left hand side by simple reverse assembly. Frame sizes 63, 71, 80 and 90 (with Pressure Die Cast Housings) have terminal box on top. Frame 180 L motors have terminal box on top, which can be changed on request to terminal box on either side.
Bearing Arrangements
Motors up to frame 132 are supplied with shielded bearings of high dynamic capacity without inner bearing cover. Frame 160 and 180 are supplied with open type bearings with separate inner and outer bearing covers.
HP KW FRAME SIZE
2 POLE 4 POLE 6 POLE 8 POLE
3000 RPM 1500 RPM 100 RPM 7500 RPM
0.16 0.12 63 63 71 71
0.25 0.18 63 63 71 80
0.33 0.25 63 71 71 80
0.5 0.37 71 71 80 90S
0.75 0.55 71 80 80 90L
1 0.725 80 80 80 100L
1.5 1.1 80 90S 90L 100L
2 1.5 90S 90L 100L 112M
3 2.2 90L 100L 112M 132S
4 3 100L 100L 132S 132M
5 3.7 100L 100L 132S 132M
5 3.7 100L 112M 132S 160M
7.5 5.5 132S 132S 132M 160M
10 7.5 132S 132M 160M 160L
15 11 160M 160M 160M 180L
20 15 160M 160M 180L
25 18.5 160L 180L
30 22 180M 180L
Mountings
Motors can be used in any of the standard mountings as shown in figure attached as per IS 1231 and IS 2253.
Foot cum Flange mounted or Foot cum Face mounted motors can also be supplied.
Dimensions
Motors are in IEC frame sizes and the fixing dimensions conform to IS 1231 for foot mounted motors and IS 2223 for flange mounted motors. The overall dimensions of motors are given in Tables attached.
Foot Mounting
FEAME FIG A AB AC AD B BB C D E F GA GD GE H HA HC HD K L
63 B 100 119 116 58 80 97 40 11 23 4 12.5 4 2.5 63 8 120 152 7 210
71 A 112 130 114   90 110 45 14 30 5 16 5 3 71 8 143   7 225
71 B 112 132 134 67 90 115 45 14 30 5 16 5 3 71 10 139 172 7 255
80 A 125 150 164   100 122 50 19 40 6 21.5 6 3.5 80 8.5 162   10 295
80 A 125 152 156 78 100 125 50 19 40 6 21.5 6 3.5 80 12 159 179 10 295
90S B 140 172 184 160 100 131 56 24 50 8 27 7 4 90 10 182   10 330
90L A 140 172 184 160 125 156 56 24 50 8 27 7 4 90 10 182   10 330
100L A 160 192 208 175 140 180 63 28 60 8 31 7 4 100 12 204 257 12 390
112M A 190 226 232 185 140 180 70 28 60 8 31 7 4 112 12 228 281 12 390
132S A 216 256 270 205 140 180 89 38 80 10 41 8 5 132 13 267 320 12 470
132M A 216 256 270 205 178 218 89 38 80 10 41 8 5 132 13 267 320 12 500
160M A 254 320 328 275 210 310 108 42 110 12 45 8 5 160 23 324 394 15 660
160L A 254 320 328 275 254 310 108 42 110 12 45 8 5 160 23 324 394 15 660
180M A 280 370 370   242 320 121 48 110 14 51.5 9 5.5 180 25 335 440 15 740
180L A 280 370 370   242 320 121 48 110 14 51.5 9 5.5 180 25 335 440 15 740
Flange Mounting
FEAME AC AD D E F GA GD GE L M N P LA LD S T
63 116 58 11 23 4 12.5 4 2.5 210 115 95 140 9 16 10 3
71 144 114 14 30 5 16 5 3 265 130 110 160 9 18.5 10 3.5
80 164 134 19 40 6 21.5 6 3.5 310 165 130 200 10 20.5 12 3.5
90 184 160 24 50 8 27 7 4 330 165 130 200 10 21 12 3.5
100 208 175 28 60 8 31 7 4 400 215 180 250 11 25 15 4
112 232 185 28 60 8 31 7 4 400 215 180 250 11 25 15 4
132 270 205 38 80 10 41 8 5 500 265 230 300 12 26 15 4
160 328 275 42 110 12 45 8 5 660 300 250 350 13 34 19 5
180 370 190 48 110 14 51.5 9 5.5 740 300 250 350 13 34 19 5
Std. Face Mounting                      Large Face Mounting
FEAME AC AD D E F GA GD GE L M N P T S DEPTH M N P T S DEPTH
63 116 90 11 23 4 12.5 4 2.5 210 75 95 90 2.5 M5 6 100 95 120 3 M6 10
71 144 114 14 30 5 16 5 3 265 85 110 105 2.5 M6 8 115 110 140 3 M8 10
80 164 134 19 40 6 21.5 6 3.5 310 100 130 120 3 M6 8 130 130 160 3.5 M8 10
90 184 160 24 50 8 27 7 4 330 115 130 140 3 M8 10 130 130 160 3.5 M10 12
100 208 175 28 60 8 31 7 4 400 130 180 160 3.5 M8 10 165 180 200 3.5 M10 12
112 232 185 28 60 8 31 7 4 400 130 180 160 3.5 M8 10 165 180 200 3.5 M10 12
132 270 205 38 80 10 41 8 5 500 165 230 200 3.5 M12 12 165 230 200 3.5 M12 12