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Chaps.
I’m trying to repair an inflatable spa which uses a vacuum motor to inflate it and then produce the bubbles.
The motor has burnt out, (arching badly across the armature).
I guess i could have it rewound, but it’s a cheap chines thing, and would probably cost more to have rewound than it’s actually worth.
I’m trying to source something which will fit into the housing, and seen quite a few Dyson motors on the fleabay, but i’m struggling to find any dimensions for these things.The motor in question has a vacuum chamber of around 125mm diameter, but i could squeeze 128mm in there, and is around 50mm deep.
Overall height is around 135, but there some head room to go up to around 150mmThe motor installed is a ronning motor td-8419m23
Any experts out there who can recommend anything.Advice on changing brushes
You’ll see from my previous post that i’m trying to source a vac motor. Could I instead ask you advice on brushes, as it might be easier to answer.
The motor was not running when i got this thing, i delved inside and found one of the brushes was excessivly worn, to the point, that i’m not sure if it was even making contact. The other one was fine with loads of meat left on it.
So trying to be clever, I created a new brush from an old one that i had kicking about.
Before i write this motor off, could the arching be down to mis-matched brushes ?
And if it is down to mis-matched brushes, given the fact that it’s unlikely i’ll find the correct ones, would any brushes work, provided they were evenly matched.
What would cause one to wear out and another one not.Re: Advice on changing brushes
Very likely commutator damaged beyond repair causing the arcing. It’s the usual way with vac motors
Re: Advice on changing brushes
A friend came up trumps with a Zanussi vac yesterday, a horrible looking yellow thing.
The motor had an 125mm fan chamber, so whilst not the exact motor, a few self tapping screws to stop it spinning, a squirt of silicone to seal it in the motor case, and it’s now fully functional again.The Chinese motor is destined for the bin.
Re: Advice on changing brushes
I’ve got the very same issue with the same (cheap) motor. Can you tell me the exact make/model or other references for the replacement Zanussi Vacuum cleaner motor you used?
I stripped the Ronning Motor TD-8419M23(900) [1] down, tested the commutators for shorts (between each the resistance was ~ 90 Ohms), cleaned and polished them, and replaced the brushes with a pair from another identical motor. It began to arc during testing and can, I think, be thrown away.
In stripping it down I had to drill out 8 studs (using a 4mm drill bit) that retain the blower blades and air flow chamber and replaced with M4 bolts (13mm and 20mm for the chamber).
The carbon brushes are 7mm x 6mm x ~ 30mm with ~40mm tails and 72mm springs. They are retained by a folding brass flap where the tail is spot-welded. When being bent this easily snaps so I used solder when fitting replacements from another identical motor.
I have ordered some 7mm x 6mm x 20mm replacements just in case they help but I think the issue is with the communtators.
[1] http://www.ronningmotor.com/index.php/products/universal-series-73/vacuum-cleaner.html
Re: Advice on changing brushes
Sorry for the late response. I don’t visit too often.
I don’t know the exact model, as I recently binned the plastics, but it looked identical to this.http://www.ebay.co.uk/itm/Zanussi-1600- … 4d0e3f72ac
The motor has a shaft on the end which is used for the belt drive.
I cut mine off with a dremmel. Ensure you mask the motor off first, so no metal filings and debris can’t get in etc.Mine developed another fault this weekend. Upon close inspection, I think it’s because I left the starting capacitor attached to the Zanussi motor.
The PCB also has a starting capacitor, so you might want to consider cutting the one out on the Zanussi motor.
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