Long stroke latching applications - much longer
than traditional linear solenoids
Permanent magnetic latching design for lock
and position control applications - both extend
and retract possible
2 position, off/on solenoid - no return spring
needed
Flexible design - case is not in
lux path; case
can be plastic or metal to suit your application
Higher starting force at long stoke and low
power
Ledex® introduces a new solenoid concept in their
PMA family of magnetic latching linear actuators. These
unique solenoids utilize permanent magnet technology
to produce on/off linear force without the need for any
magnetic steel components.
Incorporating a permanent magnet allows the unit to
be driven in two directions. The force-stroke curve is
relatively
lat over the entire length, and is suitable for
low power operations.
The addition of a steel washer will cause the magnets
to latch at either or both ends of the stroke. Long strokes
greater than one inch can be achieved with more
signi
icant starting forces than traditional DC solenoids.
Other than these steel washers, no metallic components
are required which can greatly reduce the mass of the
actuator. The units shown in the photo have a metal
output shaft and case, but can also be made with plastic.
The mass will then be dramatically reduced to primarily
the copper coil and magnets.
In direct correlation to the mass, eliminating the need
for metallic components allows for significant cost
reduction as well. While copper and magnets are still
present, the remaining plastic parts will be minimal.
Dimentions in (mm)
PMA Bi-Directional Locking Solenoids
How the PMA Concept works
PMA solenoid design consists of a coil assembly and an
output shaft assembly
Dual coil, opposite polarity, common wind
Permanent magnet actuates within field
Remaining components non-magnetic, only
serve for structure and stops
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