Hi,
Is there a method to design or to choice bearings for electrical machines?
Which are constraints to take in account?
Best regards,
Daoud
CHECK THIS LINKS MAYBE HELP YOU
http://www.midpointbearing.com/wp-content/uploads/2017/06/SKF-Rolling-bearings-and-seals-in-electric-motors-and-generators.pdf
https://www.machinedesign.com/motorsdrives/how-make-bearings-last-electric-motors
http://www.promshop.info/cataloguespdf/rolling.pdf
The best method is to bring the load spectrum (number of revs for a given probability) and the bearing life curve (number of revs to failure for 90% probability) together in a log-log diagram and to calculate the damage sum accordiung to the Palmgren-Miner rule. Damage sum 1,0 sufficient for good bearings without additional safety. Such a diagram (example) was published by Renius in KONSTRUKTION 29 (1977) No.3, 85-93 (German).
I think that the inner ring of the bearing is a data, because you need to assemble the bearing over a shaft.
In relation to the load capacity of the bearing, as to load you only have the weight of the electrical machine, so the load capacity of the bearing (obtained from the catalog), need to be greater than the loaded shaft.
By last, a bearing with one line of balls reach to this purpose.
Best regards.
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