
4. SERVO FUNCTION DETAILS B-65150E/04
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4.5.3 Torque Command Filter
(1) Overview
The torque command filter applies a primary low-pass filter to the
torque command.
If the machine resonates at a high frequency of one hundred Hz and
over, this function eliminates resonance at such high frequencies.
(2) Series and editions of applicable servo software
Series 9041/A(01) and subsequent editions (Series 0-C, 15-A)
Series 9046/A(01) and subsequent editions (Series 0-C, 15-A)
Series 9060/C(03) and subsequent editions (Series 15-B, 16-A, 18-A,
20, 21, Power Mate)
Series 9066/A(01) and subsequent editions (Series 20, 21, Power Mate)
Series 9064/B(02) and subsequent editions (Power Mate-E)
Series 9065/A(01) and subsequent editions (Power Mate-E)
Series 9070/A(01) and subsequent editions (Series 15-B, 16-B, 18-B)
Series 9080/A(01) and subsequent editions (Series 15-B, 16-C, 18-C)
Series 9081/C(03) and subsequent editions (Series 15-B, 16-C, 18-C)
Series 9090/C(03) and subsequent editions (Series 16i, 18i, 21i, Power
Mate i)
Series 90A0/A(01) and subsequent editions (Series 15i, 16i, 18i, 21i,
Power Mate i)
(3) Explanation
Fig. 4.5.3 shows the configuration of a velocity loop including the
torque command filter.
Fig. 4.5.3 Configuration of velocity loop including
torque command filter
As shown in Fig. 4.5.3, the torque command filter applies a low–pass
filter to the torque command. When a mechanical system contains a
high resonant frequency of more than 100Hz, the resonant frequency
component is also contained in the velocity feedback shown in Fig.
4.5.3 and may be amplified by proportional term. However, the
resonance is prevented by interrupting the high–frequency component
of the torque command using the filter.
VCMD
Motor
TCMD
Velocity feedback
+
−
PK1V/s + PK2V
Kt/Jm • s
Torque command filter