The theory is that if the PWM signal is high the H-Bridge is switched to
say turn the motor clockwise. If the PWM signal is low
the H-Bridge is switch to turn the motor counter clockwise. Therefore
with 50% the motor is first asked to turn one way and then
the other. That results in the motor essentially being locked in place.
The above is not the way it works. No one would design anything like
that. But let's say you did. What would happen? The motor would
vibrate and slowly rotate and have close to zero torque
It does work with high enough switching frequency because motor
inductance average out applied voltage to a more or less triangular
current over one switching period. With high enough switching frequency
current ripple is low enough average is more or less equal to analog
voltage and current.
...
Nicklas Karlsson
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
