General Information
We have a range of single coil, dc and ac and
dual coil dc solenoids.
- Solenoid Basics
- Single Coil Solenoid
A solenoid is a device that converts electrical
energy into mechanical work. Solenoids are made
up of a free moving steel plunger that sits within
a wound coil of copper wire. When electric current
is introduced, a magnetic field forms which draws
the plunger in. The exposed end of the plunger
can be attached to equipment, and when the solenoid
is activated, the plunger will move to open, close,
turn on or turn off that equipment. Single coil
devices are generally safer to use since the current
required is low, but single coil devices are bulky.
To allow a solenoid to be held energized for
long periods of time without overheating, two
separate coil windings are used instead of one.
The first coil operates at a high current level
to provide maximum pull or push. The second coil
simply holds the plunger in place after it has
completed its stroke. Since the current required
to hold the plunger in place is low, Dual coil
solenoids can be energized continuously without
overheating. This design concept results in a
highly compact solenoid approximately 1/2 the
size of a comparable single coil unit. After energizing
and pulling the plunger, the pull coil must be
turned off as soon as possible to prevent overheating
or burnout.
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