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OT 240v electric motors
philw - 1/3/09 at 03:52 PM

My air compessor's motor has just stopped and is making a humming noise, as has my tumble dryer, now not knowing a thing about electric motors the question is, does the capacitor provide an initial start current? if i turn the tumble dryer drum by hand it will start.
Or are both motors fOOOked

[Edited on [1235922830R0=033131p: by philw]


daniel mason - 1/3/09 at 03:55 PM

what sort of motors are they


philw - 1/3/09 at 03:57 PM

quote:
Originally posted by daniel mason
what sort of motors are they



Well, i dont know electric


mr henderson - 1/3/09 at 03:58 PM

They will both be induction motors, probably capacitor start.


dinosaurjuice - 1/3/09 at 03:59 PM

sometimes if the bearings wear the rotor is pulled against the stator when intially turned on, but if spun will run OK but noisily.. happened to a cheap fretsaw i had. took about an hour to strip, change bearings and rebuild.


philw - 1/3/09 at 04:01 PM

quote:
Originally posted by mr henderson
They will both be induction motors, probably capacitor start.


How do i test them?


mr henderson - 1/3/09 at 04:02 PM

quote:
Originally posted by mr henderson
They will both be induction motors, probably capacitor start.


Thinking some more about it, the TD motor could be a permanant magnet type. Post a pic and we will tell you.


philw - 1/3/09 at 04:03 PM

quote:
Originally posted by mr henderson
quote:
Originally posted by mr henderson
They will both be induction motors, probably capacitor start.


Thinking some more about it, the TD motor could be a permanant magnet type. Post a pic and we will tell you.


Hang on then


philw - 1/3/09 at 04:12 PM

Here you go



mr henderson - 1/3/09 at 04:55 PM

That looks like an induction motor to me, although more complex that usual as, presumably, it reverses?

Quite a large capacitor, looks like the sort of thing that would be used as a start capacitor.

I'd unplug the motor and get a meter on those windings to start with


philw - 1/3/09 at 05:15 PM

quote:
Originally posted by mr henderson
That looks like an induction motor to me, although more complex that usual as, presumably, it reverses?

Quite a large capacitor, looks like the sort of thing that would be used as a start capacitor.

I'd unplug the motor and get a meter on those windings to start with



Right, according to my google search on how to test motor windings they seem ok, but my multi meter is unable to test the capacitor, if i take the belt off of the motor it seems to start ok.


mr henderson - 1/3/09 at 05:37 PM

Thinking back to my days with Hotpoint, the next step would be to test the components by sustitution, and swapping the capacitor, if it looks from the wiring to be the motor capacitor, would be the next thing to try.

That's where service engineers have it over DIY mechanics, they don't have to bother with exhaustive test procedures and wiring diagram studies, just swap a bit and see if it runs

John


splitrivet - 2/3/09 at 10:19 AM

Bit late for this reply but it sounds like the start capacitor.
Cheers,
Bob


philw - 6/3/09 at 12:24 PM

Cheers guys, both fixed for the grand sum of £23.24p