Classify component parts of electronic motor drives.
BRIEF The initial requirement is the performance, in a small group, of the laboratory exercise number ELE10106 entitled “Thyristor Control of a Resistive Load”. This will be performed on 14th February 2017.
The remaining requirement is the submission of an original and individual Formal Report covering the performance of the laboratory exercise itself and including the following, (note the marks weightings given in the Marking Schedule below); a. Work as directed in the laboratory sheet, namely; i) Procedure 4 – Table of measurements. ii) Procedures 4 & 6 – Waveform plots 5.1 – 5.4 only. These must be of good quality. b. A description, in your own words, of the operation of the rectifier circuit used in the experiment (the single-phase, half controlled bridge rectifier). c. The theoretical equation for the dc voltage in this circuit is; )cos1(2 α π =+ rms dc xVV where Vrms is the value measured in part 7 of the laboratory exercise.
Calculate (to 1 decimal place) the theoretical values Vdc for the same angles as those measured in the laboratory, including 0° and 180°.
d. Using an Excel spreadsheet, or similar, plot both the measured and theoretical values of Vdc to a common base of delay angle, α, to show the relationship between Vdc and α. e. Perform an error analysis on these results. This should take the form of an evaluation of the “experimental error” associated with the laboratory work. This will allow a critical comparison to be made between the measured voltages and those obtained from the theoretical calculations.
The purpose of this is to determine whether or not the measured values “agree” with the theoretical values. In the event that this is not the case then a discussion should be provided which explains why. This process should include the quantification of the dominant errors associated with the measurements and the indication of these as “error bars” on the plot in part d. More information on this requirement has been provided in a separate sheet. f. Provide a brief summary statement of the highest presently available voltage rating and current rating of individual Thyristor devices used for power applications. g. The experimental circuit used a resistive load. In motor drive applications, the load is usually inductive in nature, i.e. it is an R-L load. Research and describe in your own words how the single-phase, half controlled bridge rectifier circuit would operate with such a load.