Vehicle lift stops under load 2.2kw 1ph motor

[Graeme Harrold]

The Lift is a must have bit of kit in a workshop, therefore I would sugest you go for a new motor rather than rewind. Youll get a better waranty on the motor new, than if you just have it re-wound. WIll pay for itself in notime.....

 

[High Tower]

I'm not saying it deff has gone for a burton but I would want to know before I did anything else if it was
My money

 

[Guinnal]

Would a faulty start or run capacitor give symptoms like these?

 

[High Tower]

Doubtfull

 

[Hawk81]

Yea sounds like windings are shot, data plate will tell amps rated, measure amps on phase line to compare as that will normally show a fault.

Only reservation I have is that this is a live test with the conductors exposed, motor running and under load, basic as it is, if your not confident I would probably farm it out to a spark

i dont believe the windings to be shot. if they were the motor would not work at all. this motor only stops under load.

 

[High Tower]

i dont believe the windings to be shot. if they were the motor would not work at all. this motor only stops under load.

Hence i havent said it certainly is, it is a possibility, worn brushes etc have seen it a lot on 3ph, current pull drops on a phase, motor starts buy wont run under load.

Good chance its a undersize motor but if it was your money wouldnt you want to test all possabilitys before throwing money away?

 

[Hawk81]

of coarse test all possible faults. i was simply saying i dont think it is the windings. you said you thought they were shot. either 1 of us could be right. i was just offering another opinion.

 

[High Tower]

of coarse test all possible faults. i was simply saying i dont think it is the windings. you said you thought they were shot. either 1 of us could be right. i was just offering another opinion.

Without doubt mate, the key to diagnosing faults from a distance without the ability to test for ourselves is to get as many opinions as possible and one will hopefully be right

I have to admit that i became less convinced about a winding fault once the op pointed out in the original post that it was a single phase motor

 

[High Tower]

Hawk, where in NI u from?

 

[Hawk81]

Hawk, where in NI u from?

Kilkeel

 

[UNG]

Does the lift manufacturers single phase motor use a continuous rated start winding without a centifugal switch that would switch it out of circuit once the motor has started on most single phase motors

Your motor sounds like it only has a start duty winding that is switched out of circuit and once the load increases on the motor it stalls as the start ( direction ) winding is no longer in circuit and therefore not providing the torque that your lift requires

You will need to check the exact spec of the lift manufacturers motor I would think this has continous rated start winding that will overcome the stall that you are experiencing under load

 

[High Tower]

Kilkeel

Nice so you can probably see the sea from where your sat


I live in Birmingham but was born in craigavon and family are from cliogher

 

[Hawk81]

Nice so you can probably see the sea from where your sat


I live in Birmingham but was born in craigavon and family are from cliogher

very good another norn ire connection on here. yeah i live right on the coast

 

[Guinnal]

Does the lift manufacturers single phase motor use a continuous rated start winding without a centifugal switch that would switch it out of circuit once the motor has started on most single phase motors

Your motor sounds like it only has a start duty winding that is switched out of circuit and once the load increases on the motor it stalls as the start ( direction ) winding is no longer in circuit and therefore not providing the torque that your lift requires

You will need to check the exact spec of the lift manufacturers motor I would think this has continous rated start winding that will overcome the stall that you are experiencing under load

If this was the case with my motor, would it restart for a short period after stopping ( loaded) if i tried switching it on again.

I.E if it runs out of torque as it speeds up then stops,should i be able to raise it by switching on & off etc raising a small distance at a time as the issue repeats itself?
(i hope this makes sense)

If so, then it doesn't. It reaches the same height every time and will not restart at all, going up- although it is obviously trying to.

(I don't have the exact spec of the lift manufacturer's single phase motor)

Thanks for all suggestions so far.

 

[UNG]

Have you checked the motor capacitors are healthy?

Does the motor stall or does it trip the overload protection

If you have run the motor to a point where it has stalled I would not expect it to restart

You do not mention what make or model the lift is which may assist in offering you advice on a fix

Are you running the motor through a contactor and overload if so have you set the overload correctly and wired it properly for single phase