
Descri
tion
Design.
Date Ed
2005.10.17
SHEET
DRAW. No.
CUST.
TITLE
C. Ma
Newly designed
Notice of the update of Digital Servo
Software 90B1 series
B-65270EN/05-005
FANUC LTD
4
9
2790 (FS15i)
Smoothing compensation performed 1.5 times per pole pair
2377 (FS16i)
Compensation gain (high-order 8 bits) Compensation phase (low-order 8 bits)
2793 (FS15i)
Smoothing compensation performed 3 times per pole pair
2380 (FS16i)
Compensation gain (high-order 8 bits) Compensation phase (low-order 8 bits)
Setting the compensation gain of the following parameters with a nonzero
value can switch between the negative direction smoothing compensation
and the positive direction smoothing compensation. In this case, the
smoothing compensation parameter explained above applies only to feeding
in the positive direction.
2791 (FS15i)
Smoothing compensation performed 1.5 times per pole pair (negative direction)
2378 (FS16i)
Compensation gain (high-order 8 bits) Compensation phase (low-order 8 bits)
2794 (FS15i)
Smoothing compensation performed 3 times per pole pair (negative direction)
2381 (FS16i)
Compensation gain (high-order 8 bits) Compensation phase (low-order 8 bits)
Since the optimum compensation parameters differ from motor to motor
(depending on the motor rather than the model), these parameters must be
determined for each synchronous built-in servo motor.
Variation in torque command that is generated when the motor is fed at a
low speed depends on the position. The application of smoothing
compensation cancels this position-dependent characteristic, allowing the
motor to move smoothly.
The measuring instruments that can be used to determine these parameters
include "SERVO GUIDE" (Ver. 3.12 or later planned).
By using SERVO GUIDE, these parameters can be determined easily.
Follow the procedure below to measure the activating phase and torque
command, which are required to determine the compensation parameters.
<1> Set channels as follows:
Channel 1: Smooth compensation counter for Synchronous built-in servo
motor
Select the target axis for measurement, and set "ROTDD" as the data kind.