Norgren has introduced a multi-position airless cylinder to complement
its existing range of pneumatic cylinders. The electric actuator can move
loads of up to 11kg at very high speeds, and is fully programmable to
deliver high stroke accuracy. The device is able to store multiple stroke
end points, each with its own defined speed, acceleration and force
parameters. The positions can be programmed anywhere in the stroke range.
The unit can be run from a programmable controller's I/O modules or via
an optional fieldbus connection.
There is no mechanical connection between the actuator's moving and
stationary masses. Movement is produced by the interaction of two
magnetic fields, one from permanent magnets in the slider and the other
produced by stator windings. Unlike conventional motors, however, either
part can move if the other is held fixed. Positions are programmed into
the device via a laptop or it may be 'taught' desired positions simply by
moving it manually and storing that position in its memory.
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