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Solenoids |
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Solenoids are the most common actuator components. The
basic principle of operation involves a moving ferrous core (a piston)
that will move inside a wire coil as shown below. Normally the piston is
held outside of the coil by a spring. When a voltage is applied to the
coil and current flows, the coil builds up a magnetic field that attracts
the piston and pulls it into the centre of the coil. The piston can be
used to supply a linear force. There are many and varied applications of
solenoid actuators. All requiring a similar type of movement and force |
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