
Axis
4. SELECTING A MOTOR
B–65142E/04
DESCRIPTIONS FOR THE α series
44
Item
Motor specifications and characteristics
Motor type (desired size and output)
Feedback type (when an absolute, incremental or pulse
position detector is required)
Options (when a brake, non–standard shaft, etc. is
required)
Separate type pulse coder (yes/no)
Acceleration/deceleration time in rapid traverse msec
Acceleration/deceleration time in cutting feed msec
Feed–forward during rapid traverse (yes/no)
Position loop gain 1/sec
Dynamic brake stop distance mm
Note
Be sure to fill in units other than the above if used. (Sometimes “deg” is used instead of “mm” for the rotary
axis.)
* Note required values for selecting the motor.
*1 If possible enter the total load inertia. If you enter the inertia of coupling, reduction gear and pulley
(motor shaft conversion) in the next item, you can also calculate the total load inertia by adding the
weight of the moving object and ball screw values by logical calculation in the case of a linear shaft.
*2 Steady–state load torque refers to the steady–state components such as friction (holding torque is
included in the case of a gravity shaft) when the motor is rotating at a fixed speed. Enter the state–state
load torque as far as possible. If details are unknown, use a value calculated logically from the weight
and friction coefficient.
Enter the steady–state load torque of the rotary axis in the same way as for load inertia as it cannot be
calculated logically. You need not enter the torque required for acceleration/deceleration.
*3 Servo delay and setting times must also be taken into consideration in the positioning time.
Operating
patterns/
Remarks
Enter typical operating patterns (time in horizontal column and torque and speed in vertical column, etc.) if
they are already known.
In cases where the machine tool makes special movements or the motor is rotated continuously, enter as
many details as possible. Feel free to enter any other comments.
Fill in this blank with a general name of machine tools, such as lathe,
milling machine, machining center, and others.
Fill in this blank with the type of machine tool decided by machine tool
builder.
Fill in this blank with the name of CNC (16i–MA, 21i–TA, PMi–D, etc.)
employed.
Enter the specifications and output of the spindle motor. (This item is
needed when selecting PSM.)
Fill in this blank with names of axes practically employed in CNC
command. If the number of axes exceeds 4 axes, enter them in the second
sheet.
4.3.1
Title
Kind of machine tool
Type of machine tool
CNC equipment
Spindle motor output
Axis