Close Loop Position Controller

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Title Closed loop position controller Objective To study the relationships between system gain and deadband of a closed loop position controller. Background study An open loop control is a control system which send the input electrical signals to produce an output. A closed loop control is the open loop control with part of the output signal feedback to the input. This is to compare the desired output with the actual output in order to adjust the system to a desired state. The difference between the actual and desired output are called offset. While the range of input change to which the system does not respond is called the dead-band. When the gain of the input signal is not sufficient the offset will be relatively high. This offset is the dead-band for a position controller. Output Output Input Input Output Potentiometer Output Potentiometer Motor Motor Motor Driver Motor Driver Summing Amplifier Summing Amplifier Amplifier Amplifier Attenuator Attenuator Input Potentiometer Input Potentiometer Function of each components in the control system 1) Summing amplifier Summing amplifier is a type of inverting operational amplifier which can sum up more than one input. In a closed loop control system, input signal and feedback signal will sum up at the summing amplifier and the total signal will be amplified to a desired output. 2) Attenuator Attenuator is used to attenuate the signal flow across. The variable of resistance is indicate from 0 to 10 as the attenuation control. The higher the attenuation the lower the gain. 3) Amplifier Amplifier is used to improve and amplified the signal. 4) Motor driver Motor driver contain H-bridge which boost up current without the change in voltage source. This produce a sufficient starting torque to drive the motor. 5) Potentiometer Rotary potentiometer are used for the

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