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Anonymous Poster

Motor Problems

03/04/2008 5:52 AM

what usually causes a motor to have difficulty in starting after running and producing a humming sound then eventualy causing the mains to trip.the motor can run if i push it as it will be humming.how can i solve this problem
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
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#1

Re: motor

03/04/2008 6:29 AM

Assuming it is a single-phase motor,

  • is the starting capacitor in-circuit at switch-on?
  • is the starting capacitor still a 'going-concern'?

If not, then the supply will trip on over-current, as the motor is in a stall condition.

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Abbas
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Join Date: Sep 2007
Posts: 49
Good Answers: 1
#2

Re: Motor Problems

03/05/2008 7:09 AM

There is no starting torque on the motor shaft.

For single phase motor case, you should follow as explained PWSLACK.

For three phase motor case, be sure that you have three phases at motor terminal. By voltage measurement it is confusing. I have been involved with these problem and couldn't find out the reason by voltage measurement. Then I checked the supplying three phase paths from MCC busbars. Busbar connector of phase "R" was not in right position and was connected to Neutral main busbar.

Good Luck

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