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2-6 Installation MN1240

Example:. Provide an estimate L

life for a BSM90 motor with a radial load or

force of 130 lbs (570 N) located 3” (76mm) from the bearing. Operating speed

is 1000 RPM.

1. Determine the systems capacity − at the distance for our application. To

do this, refer to Figure 2-4 and read information from the curve:

a. Locate our distance (3”) on the X axis.

b. Pick a speed (8,000 RPM) and locate the intersect with the 3”.

c. Read the force (100 lbs) on the Y axis.

Figure 2-4 BSM90 Load Capacity Curves

X"

(Radial Force)

Step 1a

Step 1b

Step 1c

d. Next, insert these numbers into equation (1) above and solve for

capacity “C” (round off for clarity):

16667

16 x 10

8x10

100

20, 000 +

16667

8000

100

C + 2125

2. Now that capacity is known, it is possible to estimate L

with the

applications load of 130 lbs (570 N) and 1000 RPM.

16667

16 x 10

1x10

2125

130

+ 72, 795 hours

This relates to 72,795 hours / 8500 hours/yr = 8.56 years.

Conclusion

Life is a statistical calculation based upon 90 percent of identical parts

reaching or exceeding an estimate. It depends on many different factors and

is impossible to predict precisely, however calculations provide a guideline.

Motor Poles

BSM50/63/80 Series motors are 4 pole (2 pole pair)

BSM90/100 Series motors are 8 pole (4 pole pair)

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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