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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 19:26 - 13 Mar 2021 Post subject: Anyone know about washing machine motors? |
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My 9 year old panasonic NA127VB4 has packed in. Odd failure. All the pumps, heaters etc work, it's the motor. It sometimes works, sometimes jerks a couple of times as if it's going to start moving then stops and the machine just stops there. You can never get two "starts" where it will move properly in a row off it. It does it both when it's simply trying to rotate the drum or when it's trying to spin so i don't think instability is a factor. There is a slight whining noise from the motor area when it runs but I'm not sure if that's new or just me looking for something.
Being a resourceful chap, I cleaned the motor armature with IPA and changed the brushes (which were nearly down to a nub). Put it all back together agains and... no change.
The drum itself rotates smoothly.
One of the motor bearings is perceptibly looser than the other but there's no actual detectable play. I've tested the resistance of the windings, field coils and movement sensor (I think it's a hall effect?) against the manual. All appear to be within normal limits.
I stripped the motor and noticed these dings in the rotor. They are symmetrically diagonally opposite (if there's a ding on the front on one side, there is a similar size ding on the back and opposite side). I can't see any damage in the field coils or housing that explains this but surely it's significant? Must have taken a fair old whack.
The whole area is enclosed in the field coils and motor housing so it's not like something can just drop in there.
Suggestions? (Yeah, yeah, I know, buy a new one but I've gone this far now)
https://lh3.googleusercontent.com/pw/ACtC-3dcgPrmLsZ6_aFewaZ_RisLTKBM3IEEJ2uRpVVqLc44Ly2_Y5o8xljTAd2t7p8vSKcu_83eQIm_qL7vET6IxTf5lv3lHOAWVFo3eQ0lhWCRr9LEHGoN4dkF9JqsUoxvPkMf8F5RFi6QvTL22H80ebwX=w1529-h860-no
https://lh3.googleusercontent.com/pw/ACtC-3f_2jPz9PIYNSfY-UMX3VjpAeh_oj0LMuAW6rsoeJZR4H8vXG8KofrclpD9XEgK5G5QMOtxAlzhv0k5rDP10ifHyQ2o1tZZEqKUSATHImhrK9_9XcigIedmDuTt3hZhu6p46kEsVEh7-if2sy7aTqUE=w1529-h860-no
https://lh3.googleusercontent.com/pw/ACtC-3dNc4n13Xuiwn1PMSSBmvzNxnw5O6V3FwwO-EHArBcPljDoh_gS4kR9tkQbhZDM7z3hPuaxBrUV0Y4dKsy9tQMQ8KOlMa6uwjavG8MUqjhaYd2fguGKyNOpe3t4Kz5jcUlKQvO2hQC8a4p3NikvWmO6=w1529-h860-no
https://lh3.googleusercontent.com/pw/ACtC-3dOHuuqHaYkXb0mvcvp2xmqV3jiw2M857sWUV1x_lHoHWLeZskTgnHydWYzCvFYp2kwpDGslQzBL9K3n_IeY-amSpwqPsEE6qqWyXGCMWRCmaOl6qE-pnrkMKdjsSHdIkWVNAoIMQteMJAKHrJvWUS0=w1529-h860-no ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Islander |
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Islander World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 20:05 - 13 Mar 2021 Post subject: |
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At this point I'm not sure about anything. I'd sure like to know where those dings came from. Interesting how they are in the centre of and inline with the iron cores and not inline with the spindle.
I should add I put it into a diagnostic cycle too which is supposed to just spin the drum with no balancing etc and it did the same thing btu did not return any errors.
It's pretty much looking like new washer time. A new motor is £70 which is a third of the way to a new machine with no garauntee it'll fix it. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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stinkwheel |
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stinkwheel Bovine Proctologist
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virus |
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virus World Chat Champion
Joined: 17 Aug 2006 Karma :
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Posted: 20:09 - 13 Mar 2021 Post subject: |
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Those dents look like balancing to me too, they are too even and in a logical pattern opposite each other to be random damage, especially with no damage to the magnets. ____________________ own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance. |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 20:23 - 13 Mar 2021 Post subject: |
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Just for the shit of it I've pulled the bearings (more to see if I could). One of them has a noticeable notch which you couldn't feel with it on the shaft. Not much but it's there. I wonder if this is sending an oddball "wobble" signal to the hall effect sensor and making it cut out? ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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sickpup |
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sickpup Old Timer
Joined: 21 Apr 2004 Karma :
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Posted: 20:46 - 13 Mar 2021 Post subject: |
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I would be measuring the voltage at the motor while trying to run. If it has a constant voltage when it's trying to run it suggests its the motor OR the motor sensor/tacho coil which tells the machine the speed the motor is rotating.
If the motor is 12v I would test it off a car battery, if 230V off the mains as this would eliminate or put the blame squarely on the motor.
If the motor is ok I'd look at the tacho coil. Easy way to check it s a multimeter on DC volts, connect to the tacho coil which has 2 wires and rotate the drum, should give a few volts. Tacho coil will have 2 wires the same colour probably thinner than the others
Lots of youtube vids for checking the motor and tacho coil.
Thats about the extent of my knowledge which is probably the same as yours.
This explains a bit better than do. |
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stinkwheel |
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stinkwheel Bovine Proctologist
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Islander World Chat Champion
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sickpup Old Timer
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WD Forte |
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WD Forte World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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Posted: 00:05 - 14 Mar 2021 Post subject: |
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Cheers. Yes, i got that and the componants seem to test out OK.
I was kind of discounting the PCB area because it works sometimes but not others. I can have as poke though.
I did wonder if there was a duff starter capacitor on the motor but I can't see one anywhere. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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A100man |
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A100man World Chat Champion
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Islander World Chat Champion
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Posted: 12:08 - 14 Mar 2021 Post subject: |
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stinkwheel |
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stinkwheel Bovine Proctologist
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doggone World Chat Champion
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Robby Dirty Old Man
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 16:15 - 14 Mar 2021 Post subject: |
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Hmm. There is a diode setting on one of my multimeters. I tested that one and a similar one next to it and they both show infinity one way, and a similar reading the other, which is pretty much what I'd expect. So probably not the diode.
Off to find out how you test a capacitor? ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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steve the grease |
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steve the grease Crazy Courier
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 17:52 - 14 Mar 2021 Post subject: |
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Hmm. Discharged capacitor starts with low resistance which steadily increases but doesn't reach infinity. I think that's normal since it's not been removed from the board so you wouldn't expect it to become fully saturated. Wonder if I should just replace it anyway.
I'd have thought if a critical IC had failed, which is the only other thing in the vicinity of that scorch mark, it would either work or not. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Old Thread Alert!
The last post was made 3 years, 40 days ago. Instead of replying here, would creating a new thread be more useful? |
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