Help with Shugart SA801 8" floppy with 230v 50 cycle motor...
jules.richardson99 at gmail.com
Wed Nov 26 07:49:14 CST 2008
Tony Duell wrote:
>> Fred Cisin wrote:
>>> 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
> A clever trick if you can do it!.
> You can't get jeut any speed from such a motor.
Yeah, I was rather posting when half asleep :-(
I suspect there might be a reasonable degree of commonality in small motor
designs, but I think you're right - there's no guarantee that all small motors
of a given design voltage / frequency will run at the same speed... (at least,
alternator frequency is dependent on RPM and pole count, so the RPM for a
motor is presumably dependent upon frequency and pole count)
>> 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.
Yep, I think my brain was mixing 801 and 850 up :-)
(without checking, I believe the 80x drives are single-sided, and the 85x are
double-sided variants - and the xx1 drives have some extra smarts on-board). I
suspect there's a high degree of commonality between them all, particularly in
the spindle drive (the double-sided drives presumably have some extra guts
related to the second head)
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