[email protected] (glen herrmannsfeldt) wrote:
<snip>
https://ia601603.us.archive.org/35/items/bitsavers_ibm140xSY2nd3MaintManualDec71_21919776/SY24-3395-3_1403_Models_N1_and_3_Maint_Manual_Dec71.pdf
See page 31 (or 1-26).
Induction motors run slightly slower (they aren't perfectly synchronous)
than some integer fraction of the line frequency. At 60Hz, one might
run at 3500 RPM or 1750RPM or 1150RPM (a little slip below 3600, 1800,
and 1200). A 50Hz motor might run at 2900 RPM or 1450RPM or 950RPM.
But it isn't hard to change the gear coupling the motor to the chain
or train, such that the speed is right.
Proving, once again, that documentation beats memory! (I think the 3211
was direct drive and I confused the two.) I might tanke a trip down
memory lane later by paging through the book...I haven't seen that book
in a Long, Long Time!
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
[email protected]
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