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Burning smell, sparks and noise from Miele vacuum cleaner motor

Discussion in 'Electronic Repair' started by Graz, Oct 2, 2008.

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  1. Graz

    Graz Guest

    The only electronics (on a face plate) attached to the motor are a ST
    electronics BTB16 600BW chip (used for phase control in motor speed
    controllers) and an unidentified cylindrical component marked only as
    "43-02 97C".

    Just curious whether the failure of either of these could be causing
    the motor failure symptoms in the subject line,
     
  2. Daniel Rudy

    Daniel Rudy Guest

    At about the time of 10/2/2008 1:20 AM, Graz stated the following:
    That 43-02 sounds like a motor running capacitor...43uf maybe? The 97C
    means that it will function correctly up to 97 degrees Celsius. A
    failure of the cap will cause problems. The chip mentioned is not a IC
    per say, but it's a triac.
    http://www.datasheetcatalog.org/datasheet/stmicroelectronics/7471.pdf is
    the datasheet on it.

    It sounds like the motor is a standard induction motor with a 90 degree
    phase controlled startup winding.
     
  3. Graz

    Graz Guest

    OK, thanks. I will try to measure the ESR on it. What sort of
    problems could failure cause?
    Apparently it's also brushless. And not amenable to dissasembly.
     
  4. Daniel Rudy

    Daniel Rudy Guest

    At about the time of 10/2/2008 4:11 AM, Graz stated the following:
    Failure to start or trouble starting. I'm willing to bet the triac is
    out. Personally, I would replace both. With that being a motor cap,
    you may want to get something in the 250-480v range.
    Induction motors are brushless, and you can take them apart. I've done
    it quite a few times. The stator is just the windings. The rotor is
    quite simple, basically just a bunch of steel laminates inside an
    aluminum cage. You have bearings on both ends. There isn't much to
    them. The only ways that an induction motor can fail is either a
    winding opens or shorts (which rarely happens), or the bearings go out
    (more common), and that's it. It's kinda unusual to see a low
    horsepower induction motor have a separate starting circuit, even if it
    is single phase.


    Here's some theory if you are interested.
    http://www.reliance.com/mtr/mtrthrmn.htm
     
  5. Graz

    Graz Guest

    It starts fine, just sparks quite a bit, is noisy, and there's an
    electrical burning smell (from the sparks, presumably)
    The cap checks out OK. It won't cost me much to replace the triac so
    it's worth a shot. I can get hold of a BTA16-600BW (locally) easily
    enough, but the BTB16-600BW will be more difficult. According to the
    data sheet, the only difference between them is that the "A" is
    insulated and the "B" is not, so I imagine I could use the "A"?
    It just seemed odd to me that the actual motor on a vacuum cleaner
    less than 6 years old would pack up. Especially one made by Miele,
    which prides itself on the quality of its products.
    Thanks for that, bookmarked. All your help much appreciated.
     
  6. Franc Zabkar

    Franc Zabkar Guest

    Are you describing a thermal fuse or thermal cutout?

    http://images.asia.ru/img/alibaba/photo/51516102/Thermal_fuse.jpg
    http://www.applianceblog.com/archives/ThermalCutout.jpg
    http://www.appliancepartsworldwide.com/Products/5304408936.jpg
    - Franc Zabkar
     
  7. Graz

    Graz Guest

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