In order for a voice coil motor to operate in closed loop, it needs to be connected
to a motion controller and amplifier (brush or linear). A feedback device (encoder,
LVDT) is also needed in order to close the position loop. See diagram 1 for operation
A program or motion profile will be written on a PC or laptop and
downloaded to the motion controller. This program will contain parameters such as
speed, acceleration, deceleration, PIDs, desired position, etc…
Based on the program parameters, the motion controller will send
a +/- 10V reference signal to the amplifier.
The servo amplifier will take the reference input signal and provide the necessary current to generate the required force from the motor to move to the desired position.
The motor will move to the desired position at the programmed speed
Motor position is sent back to the controller (typically 500 times
per second) to verify that the desired position has been reached and maintained.