
Axis
B–65142E/04
4. SELECTING A MOTORDESCRIPTIONS FOR THE α series
43
Select a suitable motor according to load conditions, rapid traverse rate,
increment system and other factors. To aid in selecting the correct motor,
we recommend filling in the “Servo Motor Selection Data Table” on the
following page.
This section describes the items to fill in the Servo Motor Selection Data
Table.
Servo Motor Selection Data Table
Machine Type
NC model FS Power Mate
Spindle
motor
Item
Specifications of moving object
*
Axis movement direction (horizontal, vertical, rotation, slant
_ degree)
* Weight of moving object (including workpiece, etc.) kgf
* Counterbalance kgf
*
Table support (sliding, rolling, static pressure) or friction
coefficient
Diameter mm
Pitch mm
Length mm
*
Ball
screw
Rack and pinion (diameter of pinion, traveling
distance of the machine tool per revolution of
the pinion)
Other
* Total gear ratio
Mechanical specifications
Traveling distance of the machine tool per revolution of the
motor mm
Least input increment of NC (resolution) mm
* Maximum rapid traverse feedrate mm/min
Motor speed in rapid traverse min
–1
* Cutting rapid traverse mm/min
*1 Motor shaft converted load inertia kgf·cm·s
2
Inertia of coupling, reduction gear and pulley kgf·cm·s
2
*2 Steady–state load torque kgf·cm
* Cutting thrust kgf
Maximum cutting torque (including steady–state load)
kgf·cm
Maximum cutting duty/ON time %/min
Positioning distance mm
*3 Required positioning time sec
In–position set value µm
Rapid traverse positioning frequency (continuous,
intermittent) times/min
Machine tool efficiency
4.3
HOW TO FILL IN THE
SERVO MOTOR
SELECTION DATA
TABLE