There are three
methods for tranducer drive/control that are most commonly employed:
DC drive, pulse drive, and AC drive. These methods are typically
used for displacement transducers, pulse drive motors and ultrasonic motors,
respectively. Displacement transducers are usually controlled in a closed-loop
mode. The pulse drive motor is typically operated in the open-loop mode,
but special care must be taken to suppress overshoot and mechanical ringing
that can occur after the pulse voltage is applied. The AC voltage applied to
ultrasonic motors is not very large, but the drive frequency must be precisely
matched with the mechanical resonance frequency of the device for optimum performance.
Heat generation, which is a potentially significant problem with this design,
can be effectively minimized with the proper selection of operating parameters.
Text
Content