On 22 September 2010 02:50, Jon Elson <[email protected]> wrote:

> Solenoids are not generally linear devices.  As the armature is pulled
> into the
> coil, the magnetic field becomes stronger as the air gap shrinks.

Doesn't this depend on the design? If it is a pure solenoid the
air-gap is constant, but the
amount of plunger inside the coil varies in a linear way, which may be
(but probably isn't) compensated by a linear spring.

This is not the case for the typical relay-style electromagnet (also
often called a solenoid) where the core  is static and attracts a
moving arm.

-- 
atp

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