SIP compressor motor help needed

[raveboy2012]

Hi all,

Picked up my first compressor the other day - It's a SIP workshop . However the motor was not working so I removed the unit form the tank -

It's a single phase motor with the usual start capacitor but when I removed the electrical connection blanking plate I think i could see what the problem was -

There appear to be a few burnt wires - So my questions are, what are the 3 wires going off into the motor ? Would they be neutral and 2 lives ? Also there appears to be a disconnected black wire as well which you can see. The lead coming from the connector block goes to the start capacitor. The main lead that comes from the on/off/cutoff switch is not shown as I left it on the tank.

I also thought I would try to access the motor connections from the drive end so tried to get the piston assembly off but it seems to be stuck. Would the crank be on a spline on the motor and thus just pull off or do I have to take one of the cylinder heads off to access the shaft ?

All thoughts and comments would be gratefully received as I would really like to try and get this motor working and not have to invest in a new one.

Cheers
raver

 

[mike 109444]

Recon it might be toast going by the cooking of the wires.
Any hoo to take apart come at it from other end. Remove fan then remove fan inner grill, this may come off by removing the bolts going the length of themotor. now you should be able to remove the outer of the motor with it's fielc coils leaving behind the shaft (comutator?) still attached to the pistons ect. look at the field inside the chunk you have removed and if it looks burned/cooked it's stuffed. Probley stalled for previous owner and was left trying to run but not turning hence fried. There is effectly two lives as in one will be the "start" winding and the other will be the "run". Problem with direct drive is it's not so easy to replace motor as it's part of the pump assembly.

 

[piman]

Hello Raveboy,

I don't see any capacitor which is necessary for the motor to self start. You can try and power it up then flick the fan to see if it will run, if it does all it needs is a capacitor. Otherwise I would contact SIP to get a price for e replacement stator so you can see if it is worth repairing? You don't need to dismantle the pump end, just unbolt the stator from the base. You'll need to remove the fan first then lever the end bell off the stator, it's a light interference fit on the non drive end bearing.

Alec

 

[raveboy2012]

Hi guys, many thanks for your answers. I only paid 30 quid for the whole thing so i guess its not a major bummer if i have to get a new motor.
The start capacitor is underneath the mounting base plate at the bottom. The motor still turns so i still might have a go at taking it apart so see if i can fix anything. Might stick a meter across the windings and see if i have a loop.
As a last resort en you think it would be easy to get a replacement motor?

Thanks guys
Raver

 

[brightspark]

Hi guys, many thanks for your answers. I only paid 30 quid for the whole thing so i guess its not a major bummer if i have to get a new motor.
The start capacitor is underneath the mounting base plate at the bottom. The motor still turns so i still might have a go at taking it apart so see if i can fix anything. Might stick a meter across the windings and see if i have a loop.
As a last resort en you think it would be easy to get a replacement motor?

Thanks guys
Raver

i wouldnt bother getting a new motor big $$$ and if the pump packs in after u did its a waste with it being direct drive . belt drive are worth changing as u can use the motors on something else

 

[raveboy2012]

Do you think it would be possible to convert it to belt drive if i changed the motor and the orientation of the cylinders?

 

[octo0072000]

Do you think it would be possible to convert it to belt drive if i changed the motor and the orientation of the cylinders?

No you would need a new pump and a motor

 

[raveboy2012]

Ok guys, so I managed to strip the pump unit off and get the end plates of the motor off, however the motor winding flying leads were pretty rubbish and perished.

[/URL]

[/URL]

So my options are to get it re-wound (Expensive ) or I am hoping someone has a spare FIAC direct drive motor they could sell me. This one is a 1.5HP single phase 1400RPM with what looks like 2 windings - shaft diameter is 23mm (2 AC feeds). Please PM me with options or alternatives

Thanks in advance peeps
Raver

 

[Badger1bear]

launch it in the bin and buy a new one or at least a working second hand one

 

[raveboy2012]

Yeah thought that would be the answer but the rest of it seems all good apart from the crusty flying leads !

 

[Badger1bear]

so buy an identical compressor to that one and then you will have spares

 

[mike 109444]

Due to the burned wires you no longer have a winding of wire aprox 3 to 400 meters long you have a lump of copper attached to the power cables aprox 1/2 meter long = heater!!.
Take it to a rewinder and then use there skip or weigh in the copper to get some of your £30 back.

 

[raveboy2012]

OK thanks for the pointers guys, guess I have to get a new one

 

[Badger1bear]

I know money can be tight but if you want stuff to last it's best not buying cheap unless you want it for spare parts