
B-65382EN/02 CONFIGURATIONS AND SELECTION 1.SYSTEM CONFIGURATION
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1.4.5 Driving Multiple Motors with a Large-Capacity Amplifier
With the methods introduced above, one motor is combined with one
amplifier. Combining one motor with one amplifier is the best method
from control and motor protection viewpoints because current is
controlled individually. For a machine having many axes, however,
the number of axes available for the CNC may be insufficient because
as many hardware axes as the number of amplifiers are required. To
resolve this problem, a method for connecting multiple motors in
parallel and driving them with a large-capacity amplifier is available.
The following figure is a typical example of this method. Two motors
can be seen as one motor from the amplifier. Therefore, the number of
linear encoders is one and the number of required axes is also one.
Servo amplifier #1
Magnetic pole
sensor
Linear motor #1
Linear motor #2
Axis #1
High connection
rigidity between
motors
Linear encoder
CNC
Position detection
circuit
Machine
NOTE
To drive multiple motors with one amplifier, special
installation and parameter settings different from
those used in ordinary cases are required. For
details, see Part III, "HANDLING, DESIGN, AND
ASSEMBLY," and contact FANUC.