25 Nov
2008
25 Nov
'08
11:03 a.m.
Fred Cisin wrote:
A clever trick if you can do it!.
You can't get jeut any speed from such a motor. For a synchronous motor,
IIRC the speed (in rpm) is (mains frequency * 60)/(number of pole pairs).
I have no idea how many poles the normal motor is, but I doubt you'll be
able to make one for the 'other frequenct' that uses the same pulleys.
OR, . . .
modify your disk controller to run at a differnt bit rate
The motor's just a simple AC-driven affair, is it not? Replacing with a
similar motor of the correct frequency would be another option, assuming that the pulley can easily be removed from the original and
swapped over (brain
wants to tell me that it was just secured with an allen key on the original
motor, but maybe that's wishful thinking).
It is. The pulley is easy to remove and replace. IIRC the 50Hz conversion
kit consisted of a larger pulley (so the surface speed of the pulley and
thus the belt ended up the same) and a longer belt (to fit round the
larger pulley). The spidle flywheel was unchanged.
I'm going to run into the same issue as the OP
sometime, as I have a pair of
SA800's to bring over to the US at some stage - I believe the spindle motor
portion's exactly the same between the 800 and 801.
I thought the 800 and 801 were essentially the same drive anyway. The
spindle motor should tbe the same in the 850 series (double sided) too.
-tony