The most unusual 'anchor that's ever followed me home

[Edward Sharpe]

There are phase converters that use caps. in them somehow to convert single
phase to three phase for  use in running machine tools. The trick is to find
the prints for one of these. They are not as efficient as a rotary phase
converter ( i.e.. motor gen.) but will allow you to terrorize your
neighbors.

I am envious of your new toy and wish I could unleash it on a few on my
street ! Heh Heh!

Ed Sharpe, Archivist SMECC

Jeffrey Herman wrote:

> This should be an interesting thread - I encourage everyone to
> contribute!
>
> Yesterday, a Federal Signal Corp. "air-raid" siren somehow ended
> up in my garage - all 400 pounds of it. Model SD-10, 10 hp 240
> VAC single phase motor driving an aluminum rotor. The rotor has two rows
> of opennings - 12 opennings in one row, 9 in the other, which produce
> 2 tones, in a freq'y ratio of 4-to-3 (for example, 400 and 300 Hz
> tones). The stationary portion (the "stator") also has the same number
> of opennings which align exactly with those of the rotor. The rapid
> openning and closing of these matching ports is how the tones are
> created.
>
> The spec plate says the motor shaft spins at 3300 rpm, or 55 rps.
> Hence, at top speed, one hears 660 and 495 Hz tones (plus all
> the harmonics generated - this is what gives these sirens their
> distinctive sound).
>
> The plate also says "F.L. Amps 54." (What is "F.L."?)
>
> One question - how do I apply 3-phase 240vac to a single-phase
> motor?
>
> 73 from Nevada,
> Jeff KH2PZ/7
>
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