-58-
(5) Specifying the stiffness coefficient (P_FsStf0/P_FsStf1, FSSTF0#)
Stiffness control/limited stiffness control softness is specified with the stiffness coefficient.
Set the stiffness coefficient for X, Y, Z, A, B, and C-axis each.
The stiffness coefficient is equivalent to the spring constant. The stiffness of the control increases
as the value increases, and decreases the control as the value decreases.
<Correlation between teaching position and reaction force>
If stiffness control mode is selected, when an external force acts on the arm tip, resulting in displacement
between the teach position and actual position, the robot moves to a position at which the reactive force
corresponding to the "displacement" and "stiffness coefficient" can be obtained.In the following image,
stiffness control is performed only for the tool Z-axis. By setting 0.5 [N/mm] for the Z-direction stiffness
coefficient, and the teaching position at 5 mm below the contact surface, force F produced on the contact
surface is calculated as follows.
The smaller the stiffness coefficient, the smaller the reactive force, helping to deal with
greater displacements.
When 0.0 is set with the stiffness coefficient, the reactive force is not generated in the
case of the position is changed by external force.
When the limited stiffness control, the robot is controlled within the specified reactive
force that is set with limit value.
F = 0.5 [N/mm] × 5 [mm] = 2.5 [N]
Actual position
(contact position)
Position command
(teaching position)
P_FsStf0 / P_FsStf1 = (
△
,
△
,
△
,
△
,
△
,
△
,0,0)(0,0)
△
= 0.0 to 1000.0
X, Y, Z
[N / mm]
A, B, C
[N·m / deg]
P_FsStf0=(+0.01,+0.01,+0.00,+0.00,+0.00,+0.00)(0,0)
Stiffness coefficient: Specify 0.01 [N/mm] for X, Y-axis component.
Program example
Summary of Contents for MELFA BFP-A3614
Page 1: ...Mitsubishi Industrial Robot Robot Seminar Textbook Force Sensor Application BFP A3614 ...
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Page 34: ... 23 2 F series a CR750 D controller ...
Page 35: ... 24 b CR751 D controller ...
Page 36: ... 25 c CR750 Q CR751 Q controller CPU module ...
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