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Anonymous Poster #1

Single Phase Motor

06/19/2014 1:24 AM

What are the important reasons for single phase motor winding burnt?
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dj95401
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#1

Re: Single Phase Motor

06/19/2014 2:03 AM

What do your class note say?? Over loaded or old age? Or just plain shorted out from broken down insulation??

Oh NO! She's say'n that you had that poor old motor running uphill for too long and it just fried itself!

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#2
In reply to #1

Re: Single Phase Motor

06/19/2014 2:21 AM

Fire in the vicinity?

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IdeaSmith
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#3
In reply to #2

Re: Single Phase Motor

06/19/2014 2:36 AM

Is that important?

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Tornado
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#5
In reply to #3

Re: Single Phase Motor

06/19/2014 2:43 AM

Elephino; that's why the question mark was there.

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IdeaSmith
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#7
In reply to #5

Re: Single Phase Motor

06/19/2014 3:37 AM

Gotscha!

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dj95401
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#4
In reply to #2

Re: Single Phase Motor

06/19/2014 2:40 AM

And that too

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dj95401
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#6
In reply to #4

Re: Single Phase Motor

06/19/2014 2:45 AM

OMG! Is this the same guy with Black Smoke blowing out his stack??

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PWSlack
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#8

Re: Single Phase Motor

06/19/2014 6:23 AM

Without being able to see it from here some possibilities are:

  • Overload set inappropriately high and motor overloaded mechanically
  • Short circuit in windings
  • Operated at too high a voltage
  • Not spinning due to failure of the start capacitor circuit
  • Mechanical damage to the winding with any number of possible causes
  • Cooling fan not spinning
  • Airflow to motor obstructed
  • Fire in the vicinity of the motor
  • Etc.

There are no unimportant reasons.

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Andy Germany
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#11
In reply to #8

Re: Single Phase Motor

06/20/2014 11:03 AM

Good list but you forgot a very important one (at least!):-)

Voltage too low.

I saw as a young Engineer in the UK many of these types of motor fail (in card reader and punch equipment) due to incorrect patching of the mains transformers of then modern Univac computer systems from the USA. Output voltage should have been 220VAC and it was only 190VAC.....error in the install manual.....

Thr motors would run and seem fine but got extremely hot and failed in a few weeks.....New motor and patching correctly and then no more replacement motors......I think I replaced the fifth motor and my then manager wanted a permanent fix!! He got one!!!

I also rewrote the install manual on input transformers and their patching, it saved a lot of breakdowns in the 70's in London and around the capital....

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gckent
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#9

Re: Single Phase Motor

06/19/2014 11:51 PM

The smoke got out

http://thecompassadjuster.com/education/resources/smoke-theory-of-electricity.html
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rudy.leurs
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#10

Re: Single Phase Motor

06/20/2014 5:22 AM

What are the important reasons for single phase motor winding burnt?

... excessive heat.....

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Munster
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#12

Re: Single Phase Motor

06/21/2014 5:37 PM

To much sun!
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Andy Germany (1); dj95401 (3); gckent (1); IdeaSmith (2); Munster (1); PWSlack (1); rudy.leurs (1); Tornado (2)

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