Functions And Configuration - Mitsubishi Electric MR-J4-TM Instruction Manual

14. USING A LINEAR SERVO MOTOR
14. USING A LINEAR SERVO MOTOR
WARNING

14.1 Functions and configuration

14.1.1 Summary
The fields of semiconductor/LCD manufacturing systems, mounters, and others have strong demands for
high accuracy, high speed, and efficiency. Therefore, the number of systems using a linear servo motor for a
drive axis has been increasing. Since the linear servo system can obtain the characteristics of the high
speed and the high acceleration/deceleration greater than the ball screw drive system. The linear servo
system also does not have a ball screw wear which is a weak point in the ball screw drive system. This will
extend the life of the equipment. In addition, since a response error due to backlash and friction does not
occur, you can establish a high-accuracy system.
The following shows the differences between the linear servo motor and the rotary servo motor.
Category
Motor pole Magnetic pole detection
adjustment
Home position Reference home position
return
Absolute position Absolute position encoder
detection system battery
Auto tuning Load to motor inertia ratio
(J)
MR Configurator2 Motor speed
(SW1DNC-MRC2-_) (Data display and setting)
Test
operation
function
When using the linear servo motor, read "Linear Servo Motor Instruction Manual"
and "Linear Encoder Instruction Manual".
Item
Linear servo motor
Required
1048576 pulses unit
(initial value)
Not required
Load to motor mass
ratio
mm/s unit
Positioning Supported
operation
Motor-less None
operation
JOG operation None
Program Supported
operation
Differences
Rotary servo motor
Not required
(default setting)
One servo motor
revolution unit
Required
Load to motor
inertia ratio
r/min unit
Supported
Supported
Supported
Supported
14 - 1
Remark
Automatically executed at the first
servo-on after the power is turned
on.
For the absolute position linear
encoder, [Pr. PL01] can disable the
magnetic pole detection. The timing
of the magnetic pole detection can
be changed with [Pr. PL01]. (Refer
to (2) (b) of section 14.3.3.)
Home position return pitch can be
changed with parameter setting.
(Refer to section 14.3.3)
The following alarms and warnings
are not provided for the linear servo
motor.
[AL. 25 Absolute position erased]
[AL. 92 Battery cable
disconnection warning]
[AL. 9F Battery warning]
[AL. E3 Absolute position counter
warning]