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Discussion in 'Beginner Electronics' started by Roddy Meatstick.............., Dec 31, 2006.

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  1. The vacuum cleaner motor makes just as much noise without the fan
    attached to the shaft. It's the cheap motor that makes all the noise. If
    they put a geared up induction motor in there it would be a lot quieter.
    Why don't they do that?
  2. PeterD

    PeterD Guest

    Cost, reliability, efficiency? That small vacuum motor is quite
    efficient, a compariable induction motor of the same power would be
    much larger, then the added cost of a high speed gear box (and its
  3. Some would pay the added cost for quietness. But I guess if you have
    central vac with the motor in the basement or outside you get the quiet.
    Portable quiet would be nice too.
  4. Jack

    Jack Guest

    It's the weight advantage of using the universal motor.
    An induction motor of the same power would weigh 3 times as much plus the
    weight of the gearbox.
    No one would buy a vacuum that weighed that much.
    In central vacuum systems where no one has to carry the motor they do use
    induction motors.
  5. jasen

    jasen Guest

    a vaccum cleaner is supposed to be a portable device.
    It'd take 2 guys to carry a 1.2KW induction motor upstairs.

    It's much more convenient to install ducted vacuum.

  6. PeterD

    PeterD Guest

    I recall once being in a store while they were vacuuming the floors.
    The machine they had was very quiet (almost silent, really). Down
    side? It was HUGE, the size of a 55 gallon drum, with a motor assembly
    that was quite large too. Not terribly portable, no way it would go up
    or down stairs without two people to move it. But it was quiet. I
    later checked how much it would have cost--and it was rather expensive
    too, about three times what a good non-commercial vacuum cleaner would
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