ElmoMC SimplIQ Servo Drives Composer User Manual - Manual (Page 92)

This block may be used to damp a single resonance of the system. Set the f value to
equal the resonance frequency you wish to damp (in Hz) and change the damping to
decrease the level of resonance inhibition. Decreasing the damping value widens the
frequency range in which the filter is most active, and increases the inhibition.
However, due to the uncertainty of resonances and certain drawbacks of notch filters,
low damping factors should not be used. As a rule of thumb, always use a damping
factor greater than 0.07; lower values may be dangerous.
For a low-pass filter, select LowPass from the Second order component block. The
following is the low-pass filter formula:
ω 2
s 2 + 2 · d · ω · s + ω 2 ω = 2 · π · f
The user-configurable parameters are:
ƒ
d: the Damping ratio
ƒ ω = 2 π
f: the complex pole Frequency
(in Hz)
You can use this block to inhibit the system response to frequencies higher than
f
.
For a single pole component, select Single pole from the Pole component block. The
following is the single-pole block formula:
ω
s + ω
The user-configurable parameter is:
ƒ
ω = 2 π f: the pole Frequency (in Hz)
This block may be used to inhibit the system response to frequencies higher than
f
, as
with a complex pole filter. This is probably a weaker solution than a complex pole
because high frequencies are better attenuated by complex pole than by a pole.
For a double pole component, select Double pole from the Pole component block. The
following is the double-pole component formula:
ω 2
s 2 + 2 · d · ω · s + ω 2 ω = 2 · π ·
f
This formula is the same as the LowPass formula in the Second order component block
and therefore has the same parameters.
While designing the filter, you can click Redraw to view the Bode plot. This will be the
Bode plot of the discrete results.
To accept the filter design and use it as the new filter, click OK. The Advanced Filter
ON button will be turned on (green). To disable the filter, return to the Advanced Filter
Designer and select None for each of the two components.
Elmo Composer User Manual Using the Advanced Filter Designer
MAN-COMPUM (Ver. 1.9)
A-2