anyone in the know about repairing motors

[gullyboy_131]

got an interview for a job next week as an electrical/mechanical fitter and employer says there may be some industrial ac/dc motor repair work invovled, anyone work in this area and be able to give me a leg up, would like to at least have some knowlodge to show willing. some info on rewinds and how it is carried out and the types of things that may need changing on ac/dc motors.

cheers you brainy bunch

 

[batty]

Gullyboy rewinds are normally done by specialist firms. I would think he means just getting them going. Usually contacts in switches or if they are burnt out it would mean taking them to have new bearings or rewind at specialist. Hope that helps.

Batty

 

[Evans Electric]

DC motors more complex than AC specially the speed controls ! Its a specialist field really, you find a lot of installation sparks are not that clued up. Rewinding is definitley specialist ! I once worked for a rewind co. but on installations, its a total mystery how they do it. You can't really blag your way through on motors, I've done basic 3 phase motors, nice and simple, star/delta and slip-ring AC on cranes but not DC. Modern speed contol is state of the art electronics which is another mystery to me as were the old Ward-Leonard systems and 1st generation electronics.

My mate specialises in elect breakdowns ,charges

 

[batty]

As sandra says you have got to know what you are doing. I don't get asked enough to look at them so I avoid them personally.

Batty

 

[Andy™]

most sparky know how to connect the cables to them, wire starters etc... if anything goes wrong with the motor, or electronic control gear (speed control etc), its usually specialists who get called in to deal with it

 

[gullyboy_131]

Gullyboy rewinds are normally done by specialist firms. I would think he means just getting them going. Usually contacts in switches or if they are burnt out it would mean taking them to have new bearings or rewind at specialist. Hope that helps.Batty

They actually repair motors in the workshop, he say most of his employees prefer to work out on site, in which i consider the easy work, sounds like a good thing to get into!

im still open to advice if anyone is in the know

thanks alot for the swift replies

 

[Janice]

Did some work for a company that wound their own motors a few years back.

Pretty well all motor rewinding is done by automatic machines but sometimes by hand and counting the turns. Coils are wound on formers (bit like using a lathe or a knitting machine) and then shaped, plastic sleeve is set into the stator grooves (and/or rotor if a brushed motor) and coils are eased into them. The tails from the coils are then connected up, either together or to a terminal plate or in the case of a rotor, soldered to the segments.

Intersting, but probably boring after the first day or so.

J

 

[Evans Electric]

Janice has reminded me of something. If I remember right, you can only wind a motor to do certain speeds, 1200 RPM was one I think, if any other speed is required you have to introduce speed control or gearing .

 

[gullyboy_131]

Had interview today & went ok ,far better than college actually see some burnt out windings, busted slip rings,(i would shake head and responed with 'poor maintenance') didnt really have a clue before i went about motors only what i had learnt at college. managed to hold conversations and all their test intrustments (all in one stuff) I would just add im not familer with this and that i normally use individual test equipment(i could feel my nose growing) no worries was the the reply we can train you

i pointed out a wound rotor motor blurted about resistor banks and said i havnt seen one of these in years, first time i have seen one.

just deciding if i want the job THANKS for the help everyone

 

[Andy™]

Well done. Hopefully you will get the job

 

[gullyboy_131]

Well done. Hopefully you will get the job

job was offered mate