> On Jun 27, 2007, at 10:06 PM, Vasile Surducan wrote:
>
> The key is not only the winding number/cross section (which is a
> problem of mechanical power versus efficiency) but the presence
> of the magnetic flux amplifier (brass tube as a support for  
> windigs) and
> an end of the slug made from brass with a cone shape and perfect  
> match into the
> negative cone of the ending brass tube.
>
> Inspire yourself from a high power DC relay design. The efficiency of
> such construct is huge compared with a poor iron slug.
>
> Vasile
>
Why brass ?
Cedric
>
> On 6/27/07, Cedric Chang <cc@nope9.com> wrote:
>> I am rewinding a solenoid for the fuel control on a truck injector
>> system.
>> A slug that is restrained by a small spring is pulled into the
>> solenoid to allow fuel to flow.
>>
>> Since I have a fixed amount of space, I am wondering if it
>> is better to have many windings of a smaller gauge wire or
>> fewer windings of a larger gauge wire.  I am not worried about
>> inductance or ease of winding.
>>
>> I am seeking the optimum tradeoff between heat dissipated
>> by the coil and maximum magnetic field inside the solenoid.
>>
>> I am guessing that the amount of heat dissipated is inversely
>> related to the square of the diameter of the wire ( holding
>> everything else constant ).
>>
>> The B-field seems as though it would also be related to the
>> inverse of the square of the wire diameter.  ( divide the diameter
>> by two and get 4 times as many windings. )
>>
>> If I keep everything constant except I vary the current through the
>> solenoid, the B-field seems to vary linearly with the current while
>> the heat dissipated by the solenoid seems to vary the square
>> of the current.  Would this suggest that lowering the current and
>> increasing the number of windings would improve the solenoid
>> capabilities.
>>
>> I feel I have made a mistake here somewhere since a gazillion
>> windings and nearly zero current would give me the magnetic
>> field I want.
>>
>> Of course there must be some amount of energy required to
>> move the slug into the solenoid.
>>
>>
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