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IntroductionWe offer D.C. Speed Control System, DCS-201 usefull for control laboratory. Closed loop speed control of dc motor is a common experiment for studying various features of automatic control systems like control, regulation and disturbance rejection. The present unit is designed to demonstrate the working of PWM and SCR based controllers and show the resulting waveforms of the voltage supplied to the motor. Measurement of the timings on the waveforms under various conditions has been suggested to get a good insight into the operation of the system. The experiment is complete with all the sub-systems and a detailed operating literature is included which introduces the basic theory, suggested experiments and an interpretation of the results. An external CRO is all that is needed to view the waveforms and measure the timings. Highlights PWM Power ControlSCR Power ControlCRO Display of Waveforms4-Digit Speed Display in rpmContactless Eddy Current Braking Experiments Open loop speed control for PWM Controller, with and without loadOpen loop speed control for SCR Controller, with and without loadClosed loop speed control for PWM Controller with loadClosed loop speed control for SCR Controller with loadObservation and measurements on the voltage waveforms Features and Specifications Speed control of a 12V, 4W permanent magnet d.c. motorSpeed range: 0 to 2000 rpm (typical)Opto-interrupter based speed sensing4-digit speed display in rpmElectronic tachogenerator for feedbackSeparate unit for motor in a see-through cabinetSmooth, non-contact eddy current brake 220V10%, 50Hz mains operationSupporting literature and patch cords includedEssential accessory a CRO The experiment is complete in all respect except a CRO.
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Ravi Prakash (Ses Instruments Pvt. Ltd.)
452 Adarsh Nagar, Roorkee, Uttarakhand - 247667, India
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