
B-65150E/04 4. SERVO FUNCTION DETAILS
− 225 −
• The valid AMR offset data range is between −45 (degrees)
and +45 (degrees). If a value out of this range is specified in
the parameter, an invalid-parameter alarm is issued.
NOTE) The invalid-parameter alarm detail No. is 1393.
4.14.2 Linear Motor Thrust Ripple Correction
(1) Overview
A linear motor has 10-mm, 15-mm, or 30-mm "ripples" that result from
its structure (in the case of 60 mm magnetic pole pair), which tend to
aggravate the motor feed irregularity. The occurrence of these ripples
depends solely on the motor position. So, the feed irregularity can be
improved by correcting the current command using servo software.
(2) Series and editions of applicable servo software
Series 9080/A(01) and subsequent editions (Series 15-B, 16-C, 18-C)
Series 9081/C(03) and subsequent editions (Series 15-B, 16-C, 18-C)
Series 9090/A(01) and subsequent editions (Series 16i, 18i, 21i, Power
Mate i)
Series 90A0/A(01) and subsequent editions (Series 15i, 16i, 18i, 21i,
Power Mate i)
(The Series 9066 does not support this function.)
CAUTION
When an AMR conversion coefficient is not set, an
alarm is issued. If it is set, but incorrect, no alarm is
issued. In this case, the linear motor fails to drive
correctly immediately after it passes phase Z. It may
move within one pole-to-pole span (60 mm) in the
worst case.
Torque command for correction
A
2
Sin (2
θ
+ P
2
)
+ A
4
Sin (4
θ
+ P
4
)
+ A
6
Sin (6
θ
+ P
6
)
Velocity loop
TCMD
+
Current loop
Activating phase angle
θ
Scale
Linear motor
+