Help identifying a capacitor

[Seadog]

Well done that man. And lucky that the shorting section was reachable

 

[Al Strachan]

Well done that man. And lucky that the shorting section was reachable

Thanks! and yes i was certain myself that i was going to be teased with the break 2mm inside the stator.

 

[KemppiFrog]

Blimey, that is brave (or Scorrtish..) I tend to collect motors of bits of kit that have conked, esp jetwashers (sturdy); So usually have a spare that will take over.
BTW, centrifugal switches are not usually used with caps. They activate starter windings for a short (very short)time until the motor is up to speed.
Just had this hard experience on my Drill. Switched didn't release and two seconds later the motor burst into flames.. Sort of catches your attention.

 

[Seadog]

BTW, centrifugal switches are not usually used with caps. They activate starter windings for a short (very short)time until the motor is up to speed.

Nope, you're wrong.

Capacitor start motors have a capacitor in series with the run winding which switches out once the motor has started to spin. You're thinking of a split-phase motor.

 

[Al Strachan]

Yup, for a single phase ac motor you’ll always need a capacitor to give a phase shift to create rotating field, or In Some cases an inductor for shaded pole motors.

 

[KemppiFrog]

Except that the motor on my pillar drill had a centrifugal switch and no cap? Used the start windings to give it spin, then cut them out. When the switch stuck, it burned out the motor.
My lathe has a similar motor with no cap. Both date from '60s or earlier and single phase. So, maybe not wrong in these cases? Older motors, so not what you are used to?

I had to deal with 3-phase pumps which had star/delta systems. The relay start system switches from one to the other as they spun up. Not what I have here.

 

[KemppiFrog]

Nope, you're wrong.

Capacitor start motors have a capacitor in series with the run winding which switches out once the motor has started to spin. You're thinking of a split-phase motor.

Umm,
I often pull cap start motors to bits, one today from a pool pump with noisy bearings. No switches involved.

 

[eil]

It will be a PSC motor (permanent split capacitor) if no switching involved

 

[Seadog]

Except that the motor on my pillar drill had a centrifugal switch and no cap? Used the start windings to give it spin, then cut them out.

As I said above, it's a split-phase motor.

 

[KemppiFrog]

As I said above, it's a split-phase motor.

I was replying to the bit about cap starts having switches, not seen one. Just my view.

 

[Al Strachan]

I was replying to the bit about cap starts having switches, not seen one. Just my view.

I’m the other way. Seen (and freed off) plenty centrifugal switches in my sparky days, but never seen a split phase motor, or If have it’s erased from memory! It’s not the best!