4 Product Description
22
Rev. 09/2022
4.1.7
Digression: Direct Control of Stepper Motor
In the standard application, the stepper motor of the VariFuel3 gas mixer is driven by the Vari-
Step3 stepper motor driver. For example, if you want to implement a direct activation from a
master control, you receive the technical details for activation of the stepper motor in the fol-
lowing section.
Technical Data of the Stepper Motor
Feature
Value
Design
2-phase, bipolar
Maximum phase current
2.8 A
Recommended current
1.4 A (full step operation mode)
2 A (microstep operation mode)
Step width
0.9°
Recommended control
1/16 microstep operation mode
Holding torque at maximum
phase current
1.75 Nm (15.5 lb-in)
Rotation angle
Series 140-80:
262°
Series 200-120:
308°
Technical Data of the Encoder
Feature
Value
Measuring method
Magnetic
Operating voltage
5 V
Type
Incremental, quadrature signal
Signal form
A, B, index; TTL-compatible
Resolution
4,096 CPR
Index position
Open position
You can find the assignment of the connectors on the stepper motor and encoder in the section
Connector Stepper Motor / Encoder