Electric Control II : Pid Motor Control Lab

727 WordsNov 14, 20143 Pages
Motor Control II: PID Motor Control Lab Nicholas Evan Sizemore MEGR 3171L Section L07 15 November 2014 Theory PID controllers, also known as a proportional integral device controller, are one of the most commonly used controllers in industry. A PID algorithm is derived from three coefficients. These tuning parameters are the proportional, integral and derivative coefficients, which are adjusted per device to obtain an optimal response. The sole purpose of a PID controller is to control the desired output of the system via given parameters at the input of the system. The manner in which this process is accomplished is by measuring the output of the system. From the measured value, it is compared to the desired values. A error of the output will cause an adjustment in the error signal, e(t). The schematic diagram of the control is indicated with a plus/minus circle containing a cross. The plus/minus indicates whether the value measured should be adjusted by adding or subtracting to the overall outgoing signal. If the value is subtracted then the ultimate goal is a negative feedback. The opposite can be said for a positive feedback. A positive feedback response will conclude that the system has an unstable response. This error signal is directed back into the controller that will in turn generate an accommodating control signal. This information can be understood further by reviewing Figure 1. Figure 1: Block Diagram of Basic Feedback Control Loop

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