Specialized Concentrated Focused
Machining Operations「35」
2) Servo Motor
ratio ondecelerati Mechanical
equivalent Pulse
pitchScrew
resolution Encoder
A
B
ratio gear Electronic
Electronic gear ratio: if a servo motor makes one circle per every 5000 pulse commands sent by the
system, setting electronic gear ratio of the servo motor can make the servo rotate twice with the same
amount of pulse commands (please refer to parameter setting of each servo brand).
Please see the servo motor label plate and then refer to the corresponding manual to confirm its encoder
resolution. A label plate of YASKAWA SGMSH type motor is as shown below, and the 4th character in
motor type is the serial encoder specification, so the resolution of this motor is 2
17
, i.e. 131072.
M o to r T y p e ：
T Y P E S G M S H -1 0 A C A 2 1
S ig n
S p e c .
R e m a rk
2
C
17-b it a b s o lu te
S ta n d a rd
T h e 4 th c h a ra c te r:
s e ria l e n c o d e r s p e c .
(T h e 4 th c h a ra c te r )
S ta n d a rd17-b it in c re m e n ta l
Fig. 4-4 Name plate of servo motor encoder resolution
For instance: (an example of YASKAWA) the screw pitch of a certain type machine is 5mm, with 17 bit
encoder resolution, 0.0001mm/p pulse equivalent and 1:1 deceleration ratio.
17
202 2 1310 72 81 92
1 1
203 5 / 0.0001 5 / 0.0 001 312 5
PN
Ele ctronic ge ar ratio
PN
Pulse Equivalent of Rotary Axis
The pulse equivalent of rotary axis refers to the rotation degree of the axis clamping the workpiece per
pulse. The rotary degree of workpiece per revolution of motor is equal to screw pitch.
1) Stepping motor
360
P u lse equiva le n t
360
S u b d ivision M e c hanica l de celera tio n ra tio
S tep p in g an g le
2) Servo motor
B Encoder resolution P ulse equivalent
Electronic gear ratio Mechanical deceleration ratio
A 360
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