RoboPi v1.00
User Manual v0.85
Copyright 2014 William Henning
Why the ENABLE signal of three wire drivers is useful
Most motor drivers will actively break the motor if the A and B inputs are at the same level.
When PWM speed control is used, both inputs are guaranteed to be driven low during the “off” period
of the PWM signal – which will short the two motor leads, actively breaking.
This is less than ideal for the motor, as it will get short spurts of power, then break, repeatedly.
The practical effect of this is that low speed motor control will not be linear, and the motor will sound
like it is grinding.
http://Mikronauts.com
23
2014-01-27
