Beko WMB61631S Motor issue
Hi,
my daughter has a Beko WMB61631s which recently stopped spinning. I figured it was probably the brushes so removed the motor to check, the brushes were fine but there was quite a lot of carbon all over the motor and especially around the brushes and commutator, I cleaned this up, but it still didn’t spin, I then found the motor control pcb had blown, 2 tracks were burnt out on the back and I tested the rectifier and this was bad, I figured that maybe the carbon build up had caused this, I tested the motor with my test meter and there was no short circuit or anything, I purchased a used motor control pcb from eBay and fitted it, now the motor does spin, but literally at full speed for a second or so then stops, then after a couple of minutes it spins again, but only for a second or so again. If I disconnect the motor tachometer from the main board it spins at full speed again but for longer, so I guess the main board is getting feedback from the tacho, I am asking if anyone knows if it’s possible the used board I bought is at fault, or, is it the tacho on the motor, or could it be the main board? Is there any tests I could do, I tested the resistance on the tacho and at rest it was about 90 ohms and this increased when the motor was turned.
any help would be much appreciated, I know she can’t afford a new machine right now but I don’t want to keep guessing and spend as much as a new machine on parts!
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Beko WMB61631S spins briefly at full speed due to likely tacho magnet fault
- The problem
- A Beko WMB61631S stopped spinning. After the motor was cleaned and a burnt motor control PCB was replaced with a used board, the motor would only run briefly at full speed, then stop, and repeat after a delay.
- Likely cause
- The accepted diagnosis was that the magnet inside the motor which runs within the tacho coil had fallen off, come loose, unscrewed or broken. This would cause the PCB to lose motor speed control, so the motor spins uncontrollably when powered.
- What fixed it
- Inspect the motor tacho magnet and its mounting for being loose, detached, unscrewed or broken, and repair or replace the faulty motor/tacho-related part as required. The discussion did not confirm the exact repair carried out.
- Checks to try
- Motor brushes were checked and found fine
- Carbon contamination around brushes and commutator was cleaned
- Motor control PCB was found with two burnt tracks
- Rectifier on the motor control PCB tested bad
- Used replacement motor control PCB was fitted
- With tacho connected, motor spun at full speed briefly then stopped
- With tacho disconnected, motor spun at full speed for longer
- Tacho resistance measured about 90 ohms at rest and increased when the motor was turned
- Parts or tools mentioned
- Motor control PCB
- Rectifier
- Motor tachometer/tacho coil
- Tacho magnet
- Test meter
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
Hello Fordie. If the magnet inside the motor that runs inside the tacho coil has fallen off, or come loose, unscrewed or broken then the PCB loses control of the motor speed and every time motor is powered it spins.
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