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Discussion Starter #1
I have 4160 volts AC motor, I found a dark spots on the rotor. And the ampere meter is oscillating and there is a high starting sound , this motor used in a water pumping station. FLA is 35
check attached file....

I want help to solve this problem
 

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I have 4160 volts AC motor, I found a dark spots on the rotor. And the ampere meter is oscillating and there is a high starting sound , this motor used in a water pumping station. FLA is 35
check attached file....

I want help to solve this problem
These are symptoms often associated with a broken rotor bar. Have you had a qualified motor shop look at the motor? Broken rotor bars are usually diagnosed more thoroughly BEFORE you go to the expense of removing the rotor by using a spectrum analysis of the current waveform, looking for what are called "side bars" of current harmonics as the broken bar passes through the stator fields and does not interact with them normally. Now that the rotor is out, it should be a lot easier.
 

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Discussion Starter #5
Do you have a motor shop that can rebar the rotor?
unfortunately, I sent it to a shop but he said that I must replace the rotor,

the motor is very old and I contacted the manufacturer but they said that this motor frame is obsolete.
this motor price is about $ 50,000.

that's why I want to repair it.
thanks
 

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THE "BIG RED MACHINE"
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can you take a picture of the motor ,rotor?
how do you think the rotor rod broke or failed?

you might have to ship it to Italy or something to get it fixed.
what's the motor Data?
 

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THE "BIG RED MACHINE"
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what shape is the water pump in?
how many motor pump stations do you have online?
 

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Discussion Starter #8
can you take a picture of the motor ,rotor?
how do you think the rotor rod broke or failed?

you might have to ship it to Italy or something to get it fixed.
what's the motor Data?
there are dark spots on the rotor surface , I think because of heat caused by partially broken rotor bars ...

Check attached files
 

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THE "BIG RED MACHINE"
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they want 50 thousand for that? the motor doesn't look that big.
look at a bunch of different websites for motor shop see if they have it in stock, even a used one.
 
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