Motor problem Bosch WFO2865GB

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Viewing 7 posts - 1 through 7 (of 7 total)
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  • January 29, 2010 at 5:56 pm #52067
    CJAPeterborough
    Participant

    Hi Again

    Just picked up a machine with reports of a failed motor -machine would turn but not spin
    and on inspection replaced totally worn brushes.
    The motor looks in good condition.

    The brushes slide up and down nicely and look fine to me however when the machine is put on a spin
    it struggles to build up spin speed and then cuts out,try again a few times and then the timer flicks to zero.

    So can I ask for some pointers-is it dodgy brushes
    (they are third party ones but havent had a problem with them before now
    Perhaps a bad contact (I did clean the connector and it looks sound)

    Knowing my luck the motor is fubar of course?

    Thanks in advance for your help

    Chris

    January 29, 2010 at 7:22 pm #310495
    helo_75
    Participant

    did you have any clothes in?

    January 29, 2010 at 7:22 pm #310496
    nomadPaul
    Participant

    Chris , its sometimes worth trying a few runs at the lowest spin speed first , gradually moving up in speed in case the new brushes need bedding in.
    However , if the worn brushes were that low , maybe exposing the copper braid , they may have damaged either the commutator or the motor has overheated due to excessive arcing and sparking.

    January 29, 2010 at 7:34 pm #310497
    CJAPeterborough
    Participant

    Re: Motor problem Bosch WFO2865GB

    thanks for the replies guys…

    One of the brushes was down to maybe 5mm the other a bit longer.
    I had hoped the motor would be OK as the machine was still rotating but unable to spin.

    I have had the brushes out twice now and convinced myself that the angle of contact is good and that they slide nicely.
    The commutator is smooth and prob the best I have seen….

    Tried on the slowest spin with nothing in the drum same issue tries to build up and then cuts, tries again this time shorter and again and then timer to zero.

    Can you tell me what the resistances across the 3 pair of connectors should be?
    Is the tacho bad?

    Doing a search and this particular fault has been posted a few times for this model without definate conclusions so far….

    thanks again

    January 29, 2010 at 8:27 pm #310498
    Penguin45
    Participant

    Re: Motor problem Bosch WFO2865GB

    4/5 ohms across the armature is about right. Stripping the motor and cleaning out the carbon dust can help.

    All too often I find that an armature is effectively cooked by people running the brushes right to the very end – it then generates electrical noise as soon as it tries to pick up speed, which the computer doesn’t like and aborts the spin programme.

    Penguin45.

    January 29, 2010 at 8:39 pm #310499
    CJAPeterborough
    Participant

    Re: Motor problem Bosch WFO2865GB

    thanks for you reply

    Will investigate some more tomorrow.

    Luckily I have a spare motor to swap in so can eliminate
    the connectors and wiring.

    Will strip down the dodgy motor and post back with some pics….

    January 30, 2010 at 10:56 am #310500
    CJAPeterborough
    Participant

    Re: Motor problem Bosch WFO2865GB

    Things have improved this morning as I decided to try a pair of laminated
    (slightly longer and better quality) brushes.
    Also dressed the commutator with my stick of calcium (some say you should
    some say you shouldnt) to shiny new copper surface.

    My resistance readings are now

    Across the brushes 6.0ohm (varies 5.5 to 6.5 when rotating the motor by hand)

    Pins 2-3 2.1ohm
    Pins 4-5 6.8ohm (again varies 6.5-7.5 on rotation)
    Pins 6-7 23ohm

    Looks like I am getting a good contact.

    Starting to run some checks now but I am hopeful!

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