Closed Loop Position Controller
Closed Loop Position Controller In a closed loop position controller system, the positional information from an output potentiometer (Po) which is mechanically coupled to a motor is fed back to a control amplifier. Then, the reference position input from the input potentiometer (Pi) is combined with the feedback signal at the input of the amplifier which drives the motor in proportion to the difference between two signals. When the two positions are identical, the output of the amplifier becomes zero. A simplified system diagram of a closed loop position controller which will be used in this experiment is shown in Figure 2. Figure 2 : Close loop position controller There are three amplifiers in Figure 2. The A 1 is an error signal generator, A 2 is an error signal amplifier and A 3 is the driver for the motor M. As Pi is turned away from Po, the difference between two potentiometers voltages become an error signal which appears at the input of A 1 . The error signa...