RequirementSummary032205-1

RequirementSummary032205-1 - i Requirement Summary DCMotors...

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Unformatted text preview: i Requirement Summary DCMotors Contents M.D. Fox 3/22/05 Design Project Two: DC Motor Drives ................................................................. 1 1 2 2 ASSIGNMENT ................................................................................................ 1 1. MOTOR CHARACTERIZATION. ........................................................... 2. FEEDBACK SPEED CONTROL ............................................................ 3. ENGINEERING REPORT. ..................................................................... ©1988-2005 FOX Research . All rights reserved. Design Project Two: DC Motor Drives ASSIGNMENT M. D. Fox Update : 3 ê 22 ê 05 à 1. MOTOR CHARACTERIZATION. 1. Obtain a Minertia DC motor in the laboratory. Be sure to record identifying numbers for the motor so you will be able to use the same one in subsequent laboratory sessions. For the single, unloaded motor, vary the armature voltage and measure the motor speed and armature current for each value of the armature voltage. Measure the armature resistance with an ohmmeter. a. Plot the speed versus the armature voltage. b. Determine the motor constant (in rpm/V) by fitting to a straight line. c. Use multivariate regression to deduce the armature resistance. 2. Plot the input power versus the speed. Plot the mechanical power loss versus the speed for the single motor. Repeat these procedures for a second Minertia DC motor. Are there significant differences in their characteristics? 3. Couple the two DC machines together. Vary the armature voltage to motor A, with no load connected to motor B. Measure the motor speed and the armature current for motor A for each value of the armature voltage. Using this information and that obtained for machine A alone, deduce the frictional losses in machine B as a function of the speed. 4. Repeat with machine B driving machine A. Use machine A as a motor and machine B as a generator. Connect a resistor across the armature of machine B so that .4 Ampere flows in the generator when rated voltage is applied to the motor. (This situation will be referred to as “full load.” [You may have to accept less current depending on the condition of the motor]. 5. Plot the speed versus the armature voltage for machine A under no-load and full load conditions. By what percentage does the speed decrease when full-load is applied at the rated armature voltage? You can take the rated armature voltage to be 10 Volt. 2 ReqtSummaryDCMotor032205-1.nb à 2. FEEDBACK SPEED CONTROL 1. Design a feedback control system such that the speed of the Minertia DC motor can be set to a specific speed using a MOSFET to stabilize that speed against sag due to increased mechanical load. 2. Under full-load conditions [Iload = .4 Ampere], the reduction in the speed should be one-quarter (or less) of that obtained by open loop control. 3. See the "Motor Feedback Control" write up for details on how to accomplish the feedback control design. à 3. ENGINEERING REPORT. Each student should submit a single engineering report providing designs, analysis, and the results associated with the required measurements. Be sure to include the necessary engineering equations and design calculations to justify your design. Use the report framework and style sheet provided to you in the "Lab Report Writing Tools" section of your WebCT course materials . Make sure to do all your own drawings and figures, and make sure they are properly captioned! The body of the report is limited to 10 pages, so remove all fluff and make sure only the key theory and results are included. Use references to avoid the need to repeat derivations done elsewhere, and to credit sources for figures and derivations including course notes as appropriate. Make sure your discussion and conclusions repeats and analyzes all key results. ...
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This note was uploaded on 11/18/2010 for the course ECE 3211 taught by Professor Marks during the Spring '08 term at UConn.

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