1 Jan
2022
1 Jan
'22
11:33 a.m.
On Jan 1, 2022, at 2:21 PM, Grant Taylor via cctalk
<cctalk at classiccmp.org> wrote:
On 1/1/22 12:17 PM, Dennis Boone via cctalk wrote:
Largely true, but some disk drives (RP06? RP04?) use 3-phase spindle motors. And
mainframes may use 3-phase power supplies; CDC 6000 mainframes do, though with those
it's 3 phase 400 Hz produced by motor-generators (which in turn run off 3-phase mains
power).
paul
IIRC nothing in the VAX cpu actually requires 3
phase. The PDU(s) just eat that from the wall.
I think that's the same with all the /computer/ equipment that I've seen which
connects to 3? power. A single phase could be used for all of it. But I'm told that
it's simpler / more economical (from a wiring / cable plant point of view) to deliver
more power to the equipment as 3? than it is 1?.