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Uses for old vacuum motor?

Discussion in 'General Electronics Chat' started by Myrmidon, Aug 5, 2009.

  1. Boncuk

    Boncuk New Member

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    It won't suck the solder through the motor if a diffusor is used. It has the advantage of low resistance to the air stream and solder blobs are separated in a canister which might be a coffee creamer can.

    As the air speed reduces the heavy part of the air load drops to the bottom of the can.

    See the function from the attached sketch.

    BTW, vacuum cleaners transporting dirt over the motor are outdated for quite a while. The sucked air passes through a filter before it continues to the motor, which is normally encapsuled outside the air stream. The motor is cooled on the pressure side of the turbine wheel. Without filter the turbine wheel could be damaged haeavily if solid parts pass through.
     

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    Last edited: Aug 7, 2009
  2. Externet

    Externet Member

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    -Is that residual magnetism good for generating any useable power ?

    -How does a vacuum cleaner universal motor starts the generating process and how produces magnetic flux and which is the field winding on an universal motor ?

    -If the windings are put in parallel then it is not a vacuum cleaner universal motor motor any more, is it ?

    :confused:
     
  3. colin55

    colin55 Well-Known Member

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    When wired as a shunt motor, the residual magnetism in the armature starts to produce voltage in the field and this voltage flows to the armature and current is allowed to flow from the filed winding to the armature. This produces magnetic flux in the armature and the poles pass the field poles and produce more voltage and more current. This situation in creases and increases until a maximum is reached. If we connect across the brushes, we can tap off a certain voltage and a certain current.

    We are talking about using a motor as a generator. The field winding is the outside winding - the stationary winding - the winding the does not turn - the winding connected to the case.

    Actually it is. A motor can be connected in parallel or series and it is still classified as a Universal motor.
    The reason the windings are placed in series for 100v or 240v is to reduce the amount of wire (resistance) in the windings.
    In addition, a series-wound motor runs at a higher RPM.
    You really need to get a book on this as a brief description will not give you a full understanding of how the motor works and why various things have been chosen.
     
  4. dave

    Dave New Member

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  5. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    If the windings are put in parallel you may get it to self excite but most of the steel in a universal motor is the type that doesn't hold a residual magnetic charge.
    If it does its still going to take the high operating RPM's it normally ran at to get it to self excite. And after it does due to the low resistance of the stator windings you are going to end up with a low voltage very high RPM generator. With a rather limited operating RPM band.

    If your very good with a hack saw or a file you may be able to cut slots into the stator poles and put high powered neodymium magnets in them.

    Still for the time and effort your best off buying a permanent magnet motor on line for a few 10's of dollars. You will get far more power out of it and at a much lower RPM too! ;)
     
  6. colin55

    colin55 Well-Known Member

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    This in incorrect. The armature is multi-pole and it will generate a voltage (and current) at relatively low RPM.

    As a shunt motor the energy will be delivered at a low RPM. The only wastage will be the current to drive the field.
     
  7. choliebrown

    choliebrown New Member

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    hello can i put a fan blade on a vacuum motor and use it for a fan? aren't these ac/dc motors simular to a regular window fan you buy at walmart for 20.00 and what about heat disapation how does a window fan motor cool itself? thanks ahead of time for any help:confused:
     
    Last edited: Oct 9, 2012
  8. Mr RB

    Mr RB Well-Known Member

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    No, they are a different motor with a lot more RPM and a lot more power and noise.
     

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