phytron SINCOS, Manual

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Manual SINCOS
10 MA 2066-A006 GB
3 Principle of Operation
To reach all intermediate positions between two full steps, both phase currents of a 2-
phase stepper motor have to be controlled and phase-shifted by 90 degrees. This control
is effected by an EPLD: By each control pulse a counter will be incremented or decrement-
ed in function of the direction of rotation. The counter value will be decoded equivalent to
the step resolution.
The actual transient current value is transmitted to two bipolar output stages. By applicat-
ing the constant current principle, the phase currents are in a wide range independent of
the supply voltage.
Microsteps can be programmed by dividing each full step into 1, 2, 4, 5, 10 or 20 micro-
steps. For step divisions of 2, a conventional half step or triangular phase current shape
can be selected. For step divisions of 4, 5, 10 or 20 triangular, sine-shaped or trapezoidal
phase current shapes can be selected.