The Siren Board

I have a thunderbolt 1000 with a 3 phase rotator motor. I have a dual shaft motor that will fit where the 3 phase one was. My question is that the dual shaft one is 3450 RPM and it is 1/3 hp, but will that motor work? Will it spin too fast? The old motor does not have any info on it or any ID tag. I just don't want to mess anything up. Any help will be appreciated.

Yeah, that's about twice as fast as the rotator motor it's supposed to have (1800 rpm). But I think if you put it on the 2 rpm rotation speed setting (smallest pulley on the motor and biggest on the gear reducer), it would turn the horn at a little under 4 rpm. It's probably fine as along as you don't go over that.

Yeah I'd like to be able to adjust it and to have it to rotate at 2 rpm. I've looked at some belt drive furnace blower motors that spin at 1725 rpm and it would be perfect but, most of them I have looked at have a capacitor on the top that I am afraid will not fit in the rotator box. This is the first time I have worked on a thunderbolt so I do not want to mess it up. Thanks

Single phase rotator motors that normally came with later Thunderbolts have a start capacitor on top, which technically ends up being on the "bottom" since the motors are mounted inverted on the plate. So if the furnace motor you were looking at has that, I don't see why it wouldn't fit in there, but just make sure the motor is at least 1/3 horsepower and is a 56-frame. Even if the capacitor cover won't allow the motor to fit in there (again, I don't see why not), you could also always remove the cover and extend the two leads for the capacitor enough to move it elsewhere so that it will fit.

Make sure the motor you are getting is a capacitor start motor. Most of those fan motors are PSC (permanent split capacitor) and have no torque at all. Easy way to tell is the color of the capacitor. PSC motors will use a silver metal capacitor, cap start will use a black plastic capacitor under a cover.

Ok, thanks guys! I will get a motor with a capacitor. Do you guys know a good place to look for that kind of motor?

http://www.surpluscenter.com/Electrical ... 0-2676.axd

Twice as fast?

I'd love to see a Tbolt horn spinning at 8+ RPM!

Yeah, it would be funny to see but when I get it mounted I would like it to spin at a nice slow 2 rpm rotation. If it went more than 8 it might spin itself off of the pole