Mounting toroidal transformers

Discussion in 'Beginner Electronics' started by Stoatgobbler, Feb 17, 2009.

  1. Stoatgobbler

    Stoatgobbler Guest

    Hi there,

    Does anyone know if there is a reason why I cannot mount toroidal
    transformers one on top of another (stacking them) with a single metal
    mounting bolt going through both? I can't see anything on the web which
    suggests I don't do this.

    Stoat
     
    Stoatgobbler, Feb 17, 2009
    #1
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  2. Stoatgobbler

    Shaun Guest

    "Stoatgobbler" <> wrote in message
    news:t1Gml.6176$2...
    > Hi there,
    >
    > Does anyone know if there is a reason why I cannot mount toroidal
    > transformers one on top of another (stacking them) with a single metal
    > mounting bolt going through both? I can't see anything on the web which
    > suggests I don't do this.
    >
    > Stoat


    The magnetic flux from one transformer could interact with the other one
    being that they are that close to eachother. I've seen cases where cases
    where the toroidal transformer was made up of two or more rings stacked one
    on top of the other, and then the wire wrapped around them all.

    I used to repair industrial electronics and I've never seen someone stack
    toroidal transformers before. They mount them side by side with clearance.

    Shaun
     
    Shaun, Feb 17, 2009
    #2
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  3. Stoatgobbler

    Stoatgobbler Guest

    Shaun wrote:
    > "Stoatgobbler" <> wrote in message
    > news:t1Gml.6176$2...
    >> Hi there,
    >>
    >> Does anyone know if there is a reason why I cannot mount toroidal
    >> transformers one on top of another (stacking them) with a single metal
    >> mounting bolt going through both? I can't see anything on the web which
    >> suggests I don't do this.
    >>
    >> Stoat

    >
    > The magnetic flux from one transformer could interact with the other one
    > being that they are that close to eachother. I've seen cases where cases
    > where the toroidal transformer was made up of two or more rings stacked one
    > on top of the other, and then the wire wrapped around them all.
    >
    > I used to repair industrial electronics and I've never seen someone stack
    > toroidal transformers before. They mount them side by side with clearance.
    >
    > Shaun
    >
    >


    Well, I've mounted them on top of one another, I can't find any problem
    with it.....however....I've got I've used these toroids to create two
    split rail power supplies (two independent +22v - 0 - -22v supplies) and
    to make them independant I've "lifted" the 0v commons from the chassis
    earth via 60ohm resistors. The greater the current I pull out of the
    power supply the greater the potential difference across the 60ohm
    resistor. when I pull 1.1A from the power supply then I have nearly 17v
    across the 60ohm resistor. This voltage does not seem to vary with
    raising the upper toroidal away from the lower so I don't think its to
    do with this.

    I've never "played" with this, I did expect a voltage across it (due to
    eddy currents within the transformer?) but I thought it would be
    nominal....0.25A is not nominal.

    Is this normal?
     
    Stoatgobbler, Feb 19, 2009
    #3
  4. Stoatgobbler

    Shaun Guest

    "Stoatgobbler" <> wrote in message
    news:VKfnl.2504$2...
    > Shaun wrote:
    >> "Stoatgobbler" <> wrote in message
    >> news:t1Gml.6176$2...
    >>> Hi there,
    >>>
    >>> Does anyone know if there is a reason why I cannot mount toroidal
    >>> transformers one on top of another (stacking them) with a single metal
    >>> mounting bolt going through both? I can't see anything on the web which
    >>> suggests I don't do this.
    >>>
    >>> Stoat

    >>
    >> The magnetic flux from one transformer could interact with the other one
    >> being that they are that close to eachother. I've seen cases where cases
    >> where the toroidal transformer was made up of two or more rings stacked
    >> one on top of the other, and then the wire wrapped around them all.
    >>
    >> I used to repair industrial electronics and I've never seen someone stack
    >> toroidal transformers before. They mount them side by side with
    >> clearance.
    >>
    >> Shaun

    >
    > Well, I've mounted them on top of one another, I can't find any problem
    > with it.....however....I've got I've used these toroids to create two
    > split rail power supplies (two independent +22v - 0 - -22v supplies) and
    > to make them independant I've "lifted" the 0v commons from the chassis
    > earth via 60ohm resistors. The greater the current I pull out of the power
    > supply the greater the potential difference across the 60ohm resistor.
    > when I pull 1.1A from the power supply then I have nearly 17v across the
    > 60ohm resistor. This voltage does not seem to vary with raising the upper
    > toroidal away from the lower so I don't think its to do with this.
    >
    > I've never "played" with this, I did expect a voltage across it (due to
    > eddy currents within the transformer?) but I thought it would be
    > nominal....0.25A is not nominal.
    >
    > Is this normal?


    I don't have an answer for you about that.

    Shaun
     
    Shaun, Feb 23, 2009
    #4
  5. Stoatgobbler

    Guest

    On Feb 17, 3:28 pm, "Shaun" <> wrote:
    > "Stoatgobbler" <> wrote in message
    >
    > news:t1Gml.6176$2...
    >
    > > Hi there,

    >
    > > Does anyone know if there is a reason why I cannot mount toroidal
    > > transformers one on top of another (stacking them) with a single metal
    > > mounting bolt going through both? I can't see anything on the web which
    > > suggests I don't do this.

    >
    > > Stoat

    >
    > The magnetic flux from one transformer could interact with the other one
    > being that they are that close to eachother.  I've seen cases where cases
    > where the toroidal transformer was made up of two or more rings stacked one
    > on top of the other, and then the wire wrapped around them all.
    >
    > I used to repair industrial electronics and I've never seen someone stack
    > toroidal transformers before.  They mount them side by side with clearance.
    >
    > Shaun


    Consider placing a soft steel washer just larger in diameter than the
    toroid between each.
     
    , Mar 6, 2009
    #5
  6. Stoatgobbler

    Guest

    On Feb 17, 5:33 pm, Stoatgobbler
    <> wrote:
    > Hi there,
    >
    > Does anyone know if there is a reason why I cannot mount toroidal
    > transformers one on top of another (stacking them) with a single metal
    > mounting bolt going through both? I can't see anything on the web which
    > suggests I don't do this.
    >
    > Stoat


    The strongest magnetic field is produced in a rod shape through the
    center of the toroid, when stacking them make sure to orient them both
    with the same side facing up, or to put it another way, opposite sides
    facing each other if non-horizontally mounted. If they are ran near
    capacity, they will stay cooler if you do not block one of the larger
    sides with another (heat-producing) transformer.
     
    , Mar 11, 2009
    #6
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