
B-65270EN/05 4.SERVO FUNCTION DETAILS
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4.5.6 Vibration Damping Control Function
(1) Overview
In a closed-loop system, the Pulsecoder on the motor is used for
velocity control and a separate detector is used for position control.
During acc./dec., the connection between the motor and machine may
be distorted, causing the speed transferred to the machine to slightly
differ from the actual motor speed. In such a case, it is difficult to
properly control the machine (reduce vibration on the machine).
The vibration damping control function feeds back the difference
between the speeds on the motor and machine (speed transfer error) to
the torque command, to reduce vibration on the machine.
This function has the effect of the machine velocity feedback function,
but is superior to the machine velocity feedback function in that
restrictions as imposed with the machine velocity feedback function
are eliminated.
(2) Control method
The following figure shows the block diagram for vibration damping
control:
Velocity feedback
Speed transfer error
Position command
Kp Motor
Torque command
+
−
+
−−
+
Velocity
compensator
Machine
Conversion
coefficient
Vibration-
damping
control gain
Filter
+
−
Position feedback
Fig. 4.5.5 Block diagram for vibration damping control
(3) Series and editions of applicable servo software
(Series 30i,31i,32i)
Series 90D0/A(01) and subsequent editions
Series 90E0/A(01) and subsequent editions
(Series 15i-B,16i-B,18i-B,21i-B,0i-B,0i Mate-B, Power Mate i)
Series 9096/A(01) and subsequent editions
Series 90B0/A(01) and subsequent editions
Series 90B1/A(01) and subsequent editions
Series 90B6/A(01) and subsequent editions
(Series 0i-C,0i Mate-C,20i-B)
Series 90B5/A(01) and subsequent editions