TITLE: BUILDING AND RUSE PROPORTIONAL-INTEGRAL (PI) CONTROLLER FOR ANY DC MOTOR UNIT WITH IMPROVEMENT PERFORMANCE.
This report is about a simulation analyze of modeling classical control technique of dc motor drive with improvement in proportional-integral (PI) control which is often used closed-loop procedure to control velocity of electric motor. The speed regulator uses a PI controller in order to obtain the electromagnetic torque necessary to reach the specified speed. Current controller controls the armature current by computing the right thyristor shooting angle or by using the firing gate angle. This builds the rectifier output volts needed to get the desired colonne current and so the desired electromagnetic torque. This kind of report also contains the work previously completed and work planned for the next term.
Figure1: Proportional Integral control (PI)
Figure 2: main thought of PI control
The control schematic of PI control dc motor converter-controlled separately-excited dc engine drive can be shown above. The motor drive proven is a speed-controlled system. The thyristor link converter gets its alternating current supply through single-phase transformer thus the dc outcome is fed to the colonne of the dc motor. The field is usually separately excited, and the discipline supply may be kept regular or governed. The power motor has a tachogenerator whose output is utilized for closing the speed loop. The output of the tachogenerator can be filtered to eliminate the waves to provide the signal, П‰mr. The speed control П‰r* can be compared to the Velocity signal to produce a speed error signal. This signal is usually processed through a Proportional-integral (PI) controller to determine the torque command. The torque command is limited, to keep it inside the safe current limits, and the current control is received by right scaling. The armature current command ia* is when compared to actual armature current ia to have a zero current mistake. Since there is certainly an error, PI current control mechanism processes that to alter the control transmission vc. The control transmission modifies the triggering perspective О± to become sent to the converter for implementation.
The inner current loop assures a fast current response and in addition limits the current to a safe preset level. This interior current loop makes the converter a linear current amp. The outer speed loop helps to ensure that the actual rate is always corresponding to the commanded speed and any transitive is defeat within the quickest feasible time without going above the engine and convsersion app capability. The operation of the closed-loop speed controlled drive, the speed can be maintained frequent by changing the electric motor terminal ac electricity as force torque changes. A rate from no to scored value commanded, and the motor unit is assumed to be for standstill. This will generate a large speed problem and a torque command. The armature current is going to generate the triggering angle to supply a preset maximum dc volt quality across the engine terminals. The inner current trap will keep up with the current on the level allowed by their commanded worth, producing a matching torque. As the motor start jogging, the torque and current are maintained at their particular maximum level, thus increasing the motor unit rapidly. If the rotor reaches the instructed value, the torque control will settle down to a benefit equal to the sum with the load torque and other motor unit losses to hold the electric motor in steady-state.
Meet with supervisor discussing about final year degree task. Learn and study more detailed about ac/dc motor, inauguration ? introduction motor and its modeling. Several researchers are created on the net about MATLAB software and its applications. Articles from IEEE website happen to be read about the dc motor. This project use power motor drive as insert. Decisions are meant to study regarding controller of DC electric motor by evaluating between Proportional-Integral (PI) control mechanism and Fuzzy Logic Control. Supervisor given idea to generate block established by using carries on block...
References: Sen, P. C., Thyristor DC Hard disks, J. Wiley and Sons, 1981.
Mohan, Undeland and Robbins, Electric power Electronics third edition, John Wiley & Son, INC, 2003
Nondahl, Thomas A., Microprocessor Control of Motor Pushes and Electric power Converters, training course, IEEE Industry Program Society, October 1993.
Cyril W. Lander., Power Electronics 3rd copy, McGraw-Hill, 1993.
Muhammad H. Rashid., Electrical power Electronics Circuits, Devices, and Applications 3 rd edition, Pearson Prentice Lounge, 2004.
R. Krishnan. Electric Motor Hard drives, Modeling, Evaluation, and Control, Prentice Lounge, 2001