User's Manual
Table Of Contents
Digital Servo Drivers
2.4.4 PWM output
Brushless Stepper/Brush DC
U.M.
Type
3-phase mosfet inverter
centered 20 kHz PWM
double H bridge
40kHz PWM microstepping
-
PWM frequency
20k 40k
Hz
PWM CONFIGURATION
The possible configurations are shown below.
In fig. 2.3 two coils are controlled independently so it is possible to control individual bipolar stepper
motors.
hall sensor
hall sensor
Figure 2.3: Double H bridge
In fig. 2.4 are driven the coils of a three-phase motor and a braking resistor. This configuration allows
control of brushless motors. The third current is calculated by difference from the other two.
hall sensor
hall sensor
frenatura
Figure 2.4: Three-phase bridge
Sirius Electronic Systems s.r.l. 9