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OT: Bucking magnets
OT: Bucking magnets
Off Topic question
Bucking magnets in speaker building.
Which direction does one mount the magnet to increase magnet strength of
the existing magnet?
Pos to neg or neg to neg
Thanks
Mike Mueller
Off Topic question
Bucking magnets in speaker building.
Which direction does one mount the magnet to increase magnet strength of
the existing magnet?
Pos to neg or neg to neg
Thanks
Mike Mueller
Re: OT: Bucking magnets
On Nov 29, 10:42 pm, mike mueller <cabinetma...@earthlink,net > wrote:
> Off Topic question
> Bucking magnets in speaker building.
> Which direction does one mount the magnet to
> increase magnet strength of the existing magnet?
> Pos to neg or neg to neg
A couple of points: first, the word "bucking" can be taken as
a clue. They are configured to oppose, or "buck" instead
of oriented to attract. That would mean like poles are
oriented together, e.g.:
N--S S--N
Now, the second and more subtle point is that your
question is qualified: "to increase the strength of
the magnet." I assume by this you mean to increase
the field density in the gap, where it counts (Bucking
magnets are normally added to DECREASE the
external leakahe field).
If that's the case, you have several problems in getting
to where you are going:
1. While it so happens that MUCH of the time, the addition
of an oppositely-oriented magnet on the rear of a
conventional ceramic-ring-based magnet structure
can happen, there is no guarantee it WILL happen.
it's highly dependent upon the specific configuration
of the existing magnet. In other words, I wouldn't bet
any good money on it happening.
2. If the magnet system is already operating with the
pole faces at or near saturation, adding a bucking
magnet CAN NOT increase the energy in the gap:
you simply can't push any more flux through the
steel, the flux in the gap thus won't get any greater,
and that energy will go somewhere else, primarily
into the air as more external leakage.
3. If the person designing the magnet system was
half competent, the system is optimized for a number
of parameters, such as efficiency and stability.
Changing that design by adding an external magnet
is likely to make the system less efficiency and can
significantly copromise the stability of the system by
moving the operating point to a different region of the
B-H curve. By stability, I mean the ability of the system
to retain its magnetization, which can be compromised
by the influences of the magnet field generated by the
voice coil, by mechanical or thermal shock and more.
In other words, simply adding a bucking magnet to
"increase the magnetic strength" without a detailed
knowledge of the design and operating factors involved
stands a pretty good chance of irreversibly breaking the
magnet system.
On Nov 29, 10:42 pm, mike mueller <cabinetma...@earthlink,net > wrote:
> Off Topic question
> Bucking magnets in speaker building.
> Which direction does one mount the magnet to
> increase magnet strength of the existing magnet?
> Pos to neg or neg to neg
A couple of points: first, the word "bucking" can be taken as
a clue. They are configured to oppose, or "buck" instead
of oriented to attract. That would mean like poles are
oriented together, e.g.:
N--S S--N
Now, the second and more subtle point is that your
question is qualified: "to increase the strength of
the magnet." I assume by this you mean to increase
the field density in the gap, where it counts (Bucking
magnets are normally added to DECREASE the
external leakahe field).
If that's the case, you have several problems in getting
to where you are going:
1. While it so happens that MUCH of the time, the addition
of an oppositely-oriented magnet on the rear of a
conventional ceramic-ring-based magnet structure
can happen, there is no guarantee it WILL happen.
it's highly dependent upon the specific configuration
of the existing magnet. In other words, I wouldn't bet
any good money on it happening.
2. If the magnet system is already operating with the
pole faces at or near saturation, adding a bucking
magnet CAN NOT increase the energy in the gap:
you simply can't push any more flux through the
steel, the flux in the gap thus won't get any greater,
and that energy will go somewhere else, primarily
into the air as more external leakage.
3. If the person designing the magnet system was
half competent, the system is optimized for a number
of parameters, such as efficiency and stability.
Changing that design by adding an external magnet
is likely to make the system less efficiency and can
significantly copromise the stability of the system by
moving the operating point to a different region of the
B-H curve. By stability, I mean the ability of the system
to retain its magnetization, which can be compromised
by the influences of the magnet field generated by the
voice coil, by mechanical or thermal shock and more.
In other words, simply adding a bucking magnet to
"increase the magnetic strength" without a detailed
knowledge of the design and operating factors involved
stands a pretty good chance of irreversibly breaking the
magnet system.
Re: OT: Bucking magnets
On Nov 30, 6:35 pm, pierce.lind...@gmail,com wrote:
> On Nov 29, 10:42 pm, mike mueller <cabinetma...@earthlink,net > wrote:
>
> > Off Topic question
> > Bucking magnets in speaker building.
> > Which direction does one mount the magnet to
> > increase magnet strength of the existing magnet?
> > Pos to neg or neg to neg
>
> A couple of points:
Uh, that would be me writing, before I checked to see
who was logged in. :-)
On Nov 30, 6:35 pm, pierce.lind...@gmail,com wrote:
> On Nov 29, 10:42 pm, mike mueller <cabinetma...@earthlink,net > wrote:
>
> > Off Topic question
> > Bucking magnets in speaker building.
> > Which direction does one mount the magnet to
> > increase magnet strength of the existing magnet?
> > Pos to neg or neg to neg
>
> A couple of points:
Uh, that would be me writing, before I checked to see
who was logged in. :-)
Re: Bucking magnets
"mike mueller" <cabinetmaker@earthlink,net > wrote in
message news:fio0qm06bj@news1.newsguy,com
> Off Topic question
> Bucking magnets in speaker building.
> Which direction does one mount the magnet to increase
> magnet strength of the existing magnet?
> Pos to neg or neg to neg
Please explain what you are really trying to do.
"mike mueller" <cabinetmaker@earthlink,net > wrote in
message news:fio0qm06bj@news1.newsguy,com
> Off Topic question
> Bucking magnets in speaker building.
> Which direction does one mount the magnet to increase
> magnet strength of the existing magnet?
> Pos to neg or neg to neg
Please explain what you are really trying to do.
