Directed Electronics 3200HS Especificações descarregar pdf (Página 15)

R01AN0168ED0101 Rev. 01.01 15

Application Note

Chapter 3 About Stepper Motor Movement

3.3 Recirculation of Inductance

Recirculation means performing a short-circuit on a stepper motor coil, during

the low-phase of the attached PWM. During the high-phase of the PWM the

output voltage drives a current through the coil, and during the low-phase, this

current of the coil, which represents an amount of energy, can be discharged

through the short-cut.

If recirculation is enabled, the PWM output of ISM performs a driving of the

output FET stages, which looks like this for a certain quadrant:

Figure 3-4 Inductive Output driving with Recirculation enabled

Obviously, the generated short-circuit by “~PWM(t)” avoids voltage peaks,

because the current i(t) can continuously discharge. If recirculation is switched

off, the disadvantage of the inductive voltage peak becomes obvious:

Figure 3-5 Inductive Output driving with Recirculation disabled

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