Festo Контроллер двигателя SEC-ST - Manual (Page 12)

Contents and general instructions
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Festo SEC−ST−48−6−P01−EN en 0606c
This can be calculated as follows:
NumberĄofĄstepsĄperĄrevolution
+
360°
MotorĄstepĄ.angle
Resolution +
FeedĄconstantĄofĄtheĄaxis
@ GearĄmultiplication
Steps
ńRevolution
Example
Motor step angle: 0.9° (+/− 5%) at half−step
Feed constant of the positioning axis:120mm/revolution
Gear multiplication:
1/4 ( gear reduction i = 4 )
The above example results in a resolution of 0.075 mm per
step.
All positions that this motor−gear−axis combination can run to
are divisible by 0.075.
In contrast, if the motor runs in quarter step, the resolution is
0.0375 mm; in one−tenth step, even a resolution of 0.00375
mm per step would be possible. Axis play, circumferential
backlash of any gears and the tolerance of the stepping moĆ
tor itself have to be calculated in. The stepping motor’s toleĆ
rance must always be taken into account as the absolute vaĆ
lue of the full step.
This must be considered when very precise positioning asĆ
signments are to be executed.