Re: [EVGRAY] Re: Repulsion/induction motor

Body

In 1945, my Dads auto shop had a 5 HP motor of this type on his air 
compressor.  I was always fascinated with how the brushes retracted and 
it was reversible.

On 12/9/2018 1:30 AM, Michael Cardiff [email protected] 
[EVGRAY] wrote:
>
> Another cool thing about them is how they reverse direction. Remove 
> the brush cover and you will see a lock screw that holds the brush 
> frame in place loosen that, move the holder the opposite way and the 
> motor reverses no change to wiring or switch required. most have a 
> scribe line  you line it up to tighten screw and off and running .  
> the only other thing  if the centrifugal clutch links are a worn some 
> you might have to lock the holder   with plus or minus a few thou from 
> the scribed line to get  full start torque ,and if using in extreme 
> cold on a heavy start keep the belts short  or use a jockey pulley ,I 
> have seen them snap new belts in bitter cold . I might still have a 
> old Electric Motor book that explained them better than I can if  I 
> can find it you can have it .By the way I am a retired Millwright and 
> Cobbler of equipment And other thing in the late 60's we had 1hp on a 
> old milking machine at home  that got harder and harder to start,Tthe 
> first Electrical shop My Dad took it to did not no what it was and 
> told us it was a DC motor and it would never work. My Dad said  BS as 
> he used it for years. He than to a  Old guy long retired who look like 
> he could have worked with Tesla. He opened the cover moved the brush 
> frame to line up the mark back in business the lock screw had loosened .
>
> ------------------------------------------------------------------------
> *From:* [email protected] <[email protected]> on behalf of 
> Warren Keillor [email protected] [EVGRAY] 
> <[email protected]>
> *Sent:* December 8, 2018 8:11 AM
> *To:* [email protected]
> *Subject:* Re: [EVGRAY] Re: Repulsion/induction motor
>
> Thank you Michael,
>
> I really have had no experience with IR motors, and this is helpful.
> It is an antique, but a nifty looking one.
> Cheers Warren
>
> Sent from Yahoo Mail on Android 
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>
>     On Sat, 8 Dec 2018 at 4:41 AM, Michael Cardiff
>     [email protected] [EVGRAY]
>     <[email protected]> wrote:
>     I know a little about I R motors I about installing a switch to
>     isolate the  brushes from the circuit to see if it would work as a
>     generator but I never got around to it .  Anyway  IR motors  were
>     still available in the late 70's but if I remember correctly the
>     5hp that we needed at time for a conveyor was close to 3000$ and
>     was special order which was a hell of a lot coin at the time.My
>     boss said no way when he could buy  a 5 cap start motor for a few
>     hundred $ We installed the new motor but it would only start with
>     out a load ,we replaced that with a 7.5hp still no start we ended
>     using a 10hp which still started hard but it worked ,but it was
>     probably half the physical size and the price was less than a 1/3 
>     of a 3hp R I.       I like to put them on compressors, In my
>     opinion A 3hp IR will replace a 7.5 hp cap start any day of the
>     week in hard start applications and the energy costs are way less.
>     (eg:compressors) I have rescued lots of them from our local scrap
>     yard and I only had a couple that were actually burned up and 
>     could not repair with new brushes and bearings . The compressor I
>     have in my shop was the largest head the Princess Auto sold and at
>     600 rpm  required a 5 hp.and at 800 a 7.5 hp. I run it with a 3 hp
>     at 850rpm 120 psi on 140 off Draws 16 amps.
>
>