Mitsubishi Electric MELSEC-Q Series - Page 619

13 - 15
Chapter 13 Control Sub Functions
(1) For "Ball screw" + "Reduction gear"
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
Machine
Reduction ratio 9/44
First, find how many millimeters the load (machine) will travel (
S
) when
the motor turns one revolution (AP).

AP (Number of pulses per rotation) = 4194304 [PLS]

S
(Movement amount per rotation)
= Ball screw pitch

Reduction ratio
= 10 [mm]

9/44
= 10000.0 [

m]

9/44
Substitute this for the above expression (1).
At this time, make calculation with the reduction ratio 9/44 remaining as a
fraction.
AP
=
4194304 [PLS]
S
10000.0 [

m]

9/44
=
4194304

44
10000.0

9
=
184549376
90000.0
=
23068672
=
23068672 (AP)
11250.0 11250.0 (AL)

1 (AM)
=
23068672 (AP)
1125.0 (AL)

10
(AM)
Thus, AP, AL and AM
to be set are as follows.
AP = 23068672... [Pr.2] AP = 23068672 .... [Pr.2]
AL = 11250.0 …[Pr.3] or AL = 1125.0 …... [Pr.3]
AM = 1 …………[Pr.4] AM = 10 ………... [Pr.4]
Note): These two examples of settings are only examples. There are
settings other than these examples.