1.SYSTEM CONFIGURATION CONFIGURATIONS AND SELECTION B-65382EN/02
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When the connection rigidity between motors is low
The motors are driven with simple synchronous control based on
separate position control for each axis or complete synchronous
control. In this case, two linear encoders are required. The following is
a block diagram for simple synchronous control:
Servo amplifier #2
Servo amplifier #1
Magnetic pole
n
r
1
Linear motor #1
Linear motor #2
Position
mm
n
Axis #1
Axis #2
Machine
Low connection
rigidity between
motors
Linear encoder #1
Position detection
ir
i
1
CNC
Magnetic pole
n
r
2
Linear encoder #2
Position detection
ir
i
2
When the connection rigidity between motors is medium
If the motors cannot be driven successfully with the method
introduced on the previous page, they may be driven with velocity
tandem control using two linear encoders. The following is a block
diagram for velocity tandem control:
Servo amplifier #2
Servo amplifier #1
Magnetic pole
n
r
1
Linear motor #1
Linear motor #2
Velocity
mm
n
Axis #1
Axis #2
Machine
Medium
connection rigidity
between motors
Linear encoder #1
Position detection
ir
i
1
CNC
Magnetic pole
n
r
2
Linear encoder #2
Position detection
ir
i
2
1.4.4 Driving Three or More Motors
Use three or more motors with combining control methods introduced
in the previous subsection. The following shows an example of a
configuration for driving four motors with torque tandem control and
simple synchronous control in combination. In this example, the
two-output type of position detection circuit is used for using signals
from one linear encoder for all motors.
Servo amplifier #2
Servo amplifier #1
Magnetic pole
sensor
Linear motor #1
Linear motor #2
To rq u e
command
Axis #1
Axis #2
Machine
High connection
rigidity between
motors
Linear encocer
CNC
DSP#1
High connection
rigidity between
motors
Servo amplifier #4
Servo amplifier #3 Linear motor #3
Linear motor #4
To rq u e
command
Axis #3
Axis #4
High connection
rigidity between
motors
DSP#2
Position
detection
circuit
Output #1
Output #2