Motortech VARIFUEL2, Assembly Instructions Manual

Page: 27 / 50

4 Product Description
Rev. 09/2020 27
4.1.7 Digression: Direct Control of Stepper Motor
In the standard application, the stepper motor of the VariFuel2/2+ gas mixer is driven by the
VariStep3 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 (15.49 lb-in)
Rotation angle Series 100-60 : 192°
Series 140-80: 250°
Series 200-120: 330°
Series 250-150 : 230°
Series 300-190: 278°
Series 350-225 : 306°
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
Pole Connector Stepper Motor/Encoder on page 26.