User Manual Instruction Manual

13-82

GV6000 AC Drive User Manual

13.32 Notch Filter

The GV6000 has a notch filter in the torque reference loop used to eliminate

mechanical resonance created by a gear train. Notch Filter Freq (419) sets the center

frequency for the 2 pole notch filter, and Notch Filter K (420) sets the gain.

Due to the fact that most mechanical frequencies are described in Hertz, Notch Filter

Freq (419) and Notch Filter K (420) are in Hertz as well. The following is an example

of a notch filter.

A mechanical gear train consists of two masses (the motor and the load) and spring

(mechanical coupling between the two loads). See Figure 13-25.

Figure 13.24 – Notch Filter Frequency

Figure 13.25 – Mechanical Gear Train

Gain

0 db

Notch Filter Frequency

Notch Filter K

Kspring

BLBm

Jm Jload