Chapter 4 Running
2. Electronic gear is used for graduator drive
Graduator
Reducer ratio R
Servomotor
Encoder resolution
Pt(pulse/rev)
The graduator load has
Electronic gear ratio( N ) = Pt
M Pc × R
Here,
Pc
=
360°
ΔP
For example:
Known the encoder line number C=2500 line, the reducer gear ratio 1/3, a pulse travel equivalent
ΔP=0.1°Calculate the electronic gear ratio.
Calculation step:
z Calculate the resolution of the encoder (Pt)
Pt = 4 × C = 4 × 2500 = 10000( pulse/ rev)
z Calculate the command pulse numbers for one turn of the load shaft (Pc)
Pc
=
360°
ΔP
=
360°
0.1°
=
3600
z Calculate the electronic gear ratio
Electronic gear ratio( N ) = Pt = 10000 = 30000 = 25
M Pc × R 3600 × (1/ 3) 3600 3
z Set parameters (By first numerator as an example)
Numerator N=25，denominator M=3，set P029=25 and P030=3.
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