
B-65280EN/05 FANUC AC SPINDLE MOTOR αi series 4.ADJUSTMENT
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4.2.2 HRV Filter
(1) Overview
The HRV filter can attenuate signals which are in certain frequency
band. When a strong resonance point is present in an area not lower
than 100 Hz, and it is impossible to increase the velocity loop gain,
the velocity loop gain can be increased by using this filter.
NOTE
For machines in which the rigidity of the part
connecting the spindle and motor is considered to
change with time, or for machines whose spindle
inertia changes largely depending on the tool or
workpiece used, do not use the HRV filter.
(2) Series and editions of applicable spindle software
Series 9D50/E(05) and subsequent editions
Series 9D70/A(01) and subsequent editions
(3) Details
Fig. 4.2.2 shows the HRV filter configuration.
The HRV filter is applied to the proportional (the value immediately
after the torque command filter in Fig. 4.2.1) of the torque command
after the command is passed through the torque command filter. The
HRV filter attenuates signals in a set frequency band to avoid machine
resonance.
Four filter stages in total can be applied. For each stage, filter
characteristics are set by using three parameters including the center
frequency, band width, and damping.
Torque command
(proportional)
Torque
command
(integral term)
HRV filter
+
+
To m ot or
Fig.4.2.2 HRV filter configuration