Basic Concept Of The Electronic Gear; For "Ball Screw" + "Reduction Gear" - Mitsubishi Electric QD77MS User Manual

[1] Basic concept of the electronic gear

The electronic gear is an item which determines how many rotations (rotations by
how many pulses) the motor must make in order to move the machine according
to the programmed movement amount.
Simple Motion module
Command
Control
unit
value
AL AM
The basic concept of the electronic gear is represented by the following
expression.




Electronic gear =
Set values for AP, AL and AM so that this related equation is established.
However, because values to be set for AP, AL and AM have the settable range,
values calculated (reduced) from the above related equation must be contained
in the setting range for AP, AL and AM.

(1) For "Ball screw" + "Reduction gear"

AP
Servo
PLS
amplifier
[Pr.2] (Number of pulses per rotation) = AP
[Pr.3] (Movement amount per rotation) = AL
[Pr.4] (Unit magnification)
Movement amount per rotation that considered unit magnification =
AP
S
When the ball screw pitch is 10mm, the motor is the HG-KR (4194304
PLS/rev) and the reduction ratio of the reduction gear is 9/44.
M
Reduction ratio 9/44
First, find how many millimeters the load (machine) will travel (
the motor turns one revolution (AP).
 AP (Number of pulses per rotation) = 4194304 [PLS]
 S (Movement amount per rotation)
13 - 14
Chapter 13 Control Sub Functions
Reduction ratio
PLS
M
ENC
PLS
Feedback pulse
= AM
AP
= ...(1)
AL  AM
Machine
= Ball screw pitch
= 10 [mm] 9/44


= 10000.0 [ m]
Machine
S
S
) when
Reduction ratio

When the control unit is
"mm", the minimum
9/44

command unit is 0.1 μm.