NOTE
This value at the encoder channel output...
o
Already contains the encoder gearing ratio factor (N/D)
o
Will be passed this way through the system (incl. the
gearing gear ratio already)
o
I.e. is “the value” from the encoder evaluation system
The encoder gearing ratio has a multiplicative effect on the position progress, i.e.
either “expanding” or “compressing”.
A distinction can be drawn between an encoder’s motor mode and field mode:
Motor mode: The encoder is the motor commutation encoder
Field encoder: The encoder is
not
the motor commutation encoder (instead, it
is an additional encoder in the “field”, e.g. used for position control purposes)
In motor mode, the encoder gearing is used exclusively to synchronize the motor
shaft with the encoder shaft (default: 1:1 if the shaft is the same). In this case, a
position progress value will be passed to the system at the encoder channel output.
This value will be proportional to the position progress of the motor’s commutation
(adjusted for the pole pair number).
In field mode, the encoder gearing can be used “freely” for scaling purposes.
MOOG
ID
No.:
CB40859-001
Date:
02/2018
MSD Servo Drive - Device Help
88
6 Encoder
6.8 Channel 4: Virtual encoder
Fig. 6.6: Virtual encoder dialog box
