Hi everyone,
I am trying to make a piezoelectric bimorph exciter, basically a DC motor that will control a piston with the element attached to the top. my problem is that these elements only operate at a specific frequency 27 Hz, 2 Hz either side and it stops operating as a generator so it needs to be extremely accurate!
I have decided to use a DC motor control system, PWM controlled by a potentiometer, that will have a feedback loop from a tacho fed back into an op-amp, the op-amp doesn't need a fast response.
Questions,
1) is PWM necessary if i use DC supply?
2) Are there any other methods in which to control a dc motor at such a specific frequency?
3) can i use the exact same motor as the controlled motor as the tacho and feed the generated voltage back into the op-amp?
Cheers for the feedback
I am trying to make a piezoelectric bimorph exciter, basically a DC motor that will control a piston with the element attached to the top. my problem is that these elements only operate at a specific frequency 27 Hz, 2 Hz either side and it stops operating as a generator so it needs to be extremely accurate!
I have decided to use a DC motor control system, PWM controlled by a potentiometer, that will have a feedback loop from a tacho fed back into an op-amp, the op-amp doesn't need a fast response.
Questions,
1) is PWM necessary if i use DC supply?
2) Are there any other methods in which to control a dc motor at such a specific frequency?
3) can i use the exact same motor as the controlled motor as the tacho and feed the generated voltage back into the op-amp?
Cheers for the feedback