SIEMENS
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Siemens NC 62 · 2016
Linear motors
SIMOTICS L linear motors for SINAMICS S120
SIMOTICS L-1FN3
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Overview
In combination with the SINAMICS S120 drive system,
SIMOTICS L-1FN3 linear motors provide an optimally tuned
linear direct drive system for the requirements of modern
mechanical engineering.
The motors comprise a primary section and a secondary section
track with magnets made of rare-earth material. The primary
section has fixed dimensions, while the secondary section track
is made up of individual elements (secondary sections) to suit
the required traversing range. Through parallel operation of the
motors, feedrate force and length can be scaled beyond the
available spectrum.
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Benefits
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Outstanding dynamic response and very high traversing
velocity
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Excellent precision
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Simple installation
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Drive components are free of wear thanks to contactless drive
force transmission
The main advantage of linear direct drive technology is the
extensive avoidance of the effects of elasticity, backlash, and
friction, as well as natural oscillation in the drive train. This results
in a higher dynamic response and increased precision. If
suitable measuring systems are used and the temperature
conditions are appropriate, the motors can be positioned in
the nanometer range.
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Application
Version for peak load
Used in machine axes that are temporarily accelerated, e.g. S3
duty or when large forces are required for a short time.
Typical applications:
•
Highly dynamic, flexible machine tool and production
machine construction
•
Laser machining
• Handling
Version for continuous load
Used in machine axes with constant acceleration changes, e.g.
S1 duty, with high process/weight forces or for operation without
water cooling.
Typical applications:
• Grinding
•
Non-circular machining (e.g. oscillating applications)
•
Z axes without weight compensation, quills
•
Handling, Cartesian robots
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Design
The simple mechanical construction without transmission
elements, such as ballscrew, coupling or belt, enhances the
reliability of the drive components.
Heat loss occurs almost exclusively in the primary section and is
dissipated via an integrated liquid cooling system. The Thermo-
Sandwich dual-circuit cooling system allows the motor to be
decoupled from the machine, and is also an inexpensive cooling
design.
The stainless steel encapsulation of the primary section ensures
the high mechanical ruggedness and resistance to soiling re-
quired for use in machine tools and production machines, as
well as high resistance to corrosive liquids. In addition, the motor
places minimal demands on the preparation of mounting sur-
faces thanks to the large air gap. The mounting tolerances for
the air gap are
±
0.3 mm (0.012 in).
Design variants
SIMOTICS L-1FN3 linear motors are available as single-sided or
double-sided motors.
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Single-sided motors
The single-sided version consists of a primary section that is
arranged in parallel to the associated secondary section.
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Double-sided motors
The special secondary section of the double-sided version is
positioned between two primary sections (one primary section
with standard winding and one with complementary winding).
The design as a double-sided motor is particularly suitable
for applications with movable secondary section and small
traversing paths with extremely fast acceleration rates, e.g.
non-circular machining.
© Siemens AG 2016