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20
S
E
R
V
O F
L
E
X
S
F
C
Size
LF dimension [mm]
005
7.85
010
9.15
020
10.75
030
12.4
035
15.5
040
15.5
050
20.5
060
25.2
080
30
090
30
100
30
¢
Feed-screw systems
¢
How to evaluate the eigenfrequency of
feed-screw system
¢
Mounting
Motor
Feed
screw
Bearing
Table
Coupling
J1
J2
Rotative direction
Axial direction
LF
LF
(1) Oscillation phenomena of servo motors
If the eigenfrequency of the entire feed-screw system is under
400 to 500Hz, oscillation may occur depending on the gain
adjustment of the servo motor.
The problems can be avoided by raising the eigenfrequency
of the mechanical system or adjusting the tuning function (filter
function) of the servo motor.
(1) Select the coupling according to the normal operating torque
and maximum torque of the servo motor/stepping motor.
Nf: Eigenfrequency of the entire feed-screw system [Hz]
k
: Torsional stiffness of the coupling and feed screw [N·m/rad]
J1: Moment of inertia of the driving side
J2: Moment of inertia of the driven side
The concentricity of the right and left bore diameters is ensured
by adjusting with an specialized jig. However, the assembly
accuracy may be disturbed if a strong impact is given to the
product. Please handle it with care.
(1) Confirm the clamping bolts are loosened. Remove the rust,
dust and oil content on the inside diameter surface of the
shaft and coupling. (Wipe off the oil content completely with a
waste cloth, etc.)
(4) Make sure that the insertion length of the coupling into the
shaft is kept in the position so that the target shaft is in
contact with the entire length of the flange (LF dimension) as
illustrated below.
(2) Resonance caused by stepping motors
Resonance can occur within a certain speed range due
to the pulsation frequency of the stepping motor and the
eigenfrequency of the entire system. Resonance can be
avoided by not applying the resonant rotation speed, or by
reviewing the eigenfrequency in the design phase.
Contact us for unclear points concerning oscillation
phenomena of servo motors.
Contact us for unclear points concerning resonance of
stepping motors.
(2) In the following feed-screw system, evaluate the entire
eigenfrequency: Nf from the torsional stiffness:
k
of the
coupling and feed screw, the moment of inertia: J1 of the
driving side and the moment of inertia: J2 of the driven side.
(3) Confirm the two clamping bolts are loosened and the coupling
is movable to the axial and rotative directions.
If it does not move smoothly, adjust centering of both shafts
again.
If the concentricity can not be confirmed with the method
described above, confirm the mounting accuracy by other
measures.
(2) Insert the coupling into the shaft. At this time, do not apply
more than necessary force such as compression or pulling to
the element part of the coupling.
After the coupling is mounted into the motor, do not apply
excessive compression when inserting the coupling into the
mating shaft.
Design Check Items
SFC MODEL
Содержание COUPLINGS
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