| Selection Procedure |
| Selection Examples |
| A 5 HP, 4 Pole (1440 RPM) B5 Flange Mounted Motor is to be connected to the gear box with Hollow Input. Motor Frame Size is 112M. The output speed of the gear box should be 60 RPM. The Output shaft of the gear box is fitted with a 8 inch sprocket. This is used to drive a conveyor which works for 8 Hrs a day. Type of loading is uniform. |
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| Selection based on Input HP & Output RPM |
| A) |
Refer Table 10. Check for 5 HP & S.F.1.4 The nearest RPM is 64 & Model is 2039 |
| B) |
Now from Table 9, the thermal rating of Model 2039 is 4KW (= 5.36 HP). This is more than the connected power of 5 HP. Hence O.K. |
| C) |
Refer Table 9 for checking motor frame size. The motor which is to be connected to the gear box directly is 112M Frame Size. Now Hollow Frame size of 112 is available for Model 2039. Hence the selection is O.K. |
| D) |
Finally, we have to check the radial load. It is given by formula given in 2.1 |
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F = ( 14052200 x P x Fc ) / ( D x N ) = (14052200*5*1)/(200*60) = 5855 N |
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The radial Load Capacity of output shaft of Model 039 is 889 Kg = 8890 N
The allowable radial load Fr is calculated as given in 2.1
Fr = Fo x Lf x K |
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Assuming Sprocket position at a dist of 20 mm from the gear box face, L = 0.74 from Table 7
For the output speed of 30 RPM & for a Life of 10000 working hours K = 0.71 from Table 4
Hence Fr = 8890 * 0.74 * 0.71 = 4670 N |
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his is less than actual radial load of 5855 N. Hence either increase the sprocket diameter or give support on the other end of the shaft or go to higher model & check. Checking for higher model, let us select one size higher model 2050 The radial Load Capacity of output shaft of Model 050 is 1395 Kg = 13950 N The allowable radial load Fr is calculated as given in 2.1
Fr = Fo x Lf x K |
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Assuming Sprocket position at a dist of 20 mm from the gear box face, L = 0.74 from Table 7
For the output speed of 30 RPM & for a Life of 10000 working hours K = 0.71 from Table 4
Hence Fa = 13950 * 0.74 * 0.71 = 7329 N
This is higher than actual radial load of 5855 N. Hence selection is O.K.
Thus the final Model selected is 2050. |