8
Ele ctric cylin der s S RS A , SVS A a n d S L S A
8
2.2 Operating principle
The operating principle of Ewellix electromechanical cylin-
ders is described by the cinematic drawing below (estab-
lished in accordance with NF EN ISO 3952-1 standard).
The operating principle of Ewellix
electromechanical cylinders
J
1
J
1
J
2
J
3
w
a
w
b
S
c
x
1
2
3
4
5
Anti-rotation system
Comments
1
Motor rotor
ω
a
Rotating speed of motor shaft
ω
b
Rotating speed of roller screw or ball screw
2
Gear system between motor shaft and roller screw (or
ball screw) shaft. r is gear ratio.
ω
a
r =
–––
ω
b
3
Roller screw or ball screw = screw gear changing
rotation of screw (green color) into translation of nut
and pushing tube of cylinder (red color).
4
Pushing tube of cylinder
Sc
Translation speed of pushing tube
x
Translation move of pushing tube
5
Anti-rotation of pushing tube. Depending on cylinder
definition, this system is integrated into the cylinder or
located on the customer’s machine.
Description of kinematic joints
J
1
Revolute joint
J
2
Screw joint
J
3
Prismatic joint
J
1
J
2
J
3
Summary of Contents for SLSA Series
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