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Sunny Day Dyno Instructions: Measuring Motor Torque and Rotational Velocity - Prof. Matthe, Study Guides, Projects, Research of Mechanical Engineering

University of North Texas (UNT)Mechanical Engineering
Prof. Matthew Jason Traum

Instructions on how to use the sunny day dynamometer to estimate the torque and rotational velocity of a small motor. A procedure for attaching the measuring disc, taking rpm readings, and calculating torque using the provided formula sheet. Safety precautions and tools required are also mentioned.

Typology: Study Guides, Projects, Research

Pre 2010

Uploaded on 08/19/2009

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Dynamic๎˜ƒDynamometer๎˜ƒInstructions๎˜ƒ
Dayโ€Kaylorโ€Walton๎˜ƒ๎˜ƒ
Precision๎˜ƒRotational๎˜ƒVelocity๎˜ƒand๎˜ƒVariable๎˜ƒRevolutions๎˜ƒPer๎˜ƒMinute๎˜ƒTwo๎˜ƒRadius๎˜ƒ
System๎˜ƒfor๎˜ƒForce๎˜ƒCalculations๎˜ƒand๎˜ƒTorque๎˜ƒConversion๎˜ƒ
or๎˜ƒ
Sunny๎˜ƒDay๎˜ƒDyno๎˜ƒ
๎˜ƒ
Deโ€Obfuscation๎˜ƒDocument๎˜ƒ
By๎˜ƒBrian๎˜ƒKaylor๎˜ƒ
๎˜ƒ
Introduction:๎˜ƒ
Thank๎˜ƒyou๎˜ƒfor๎˜ƒ*choosing*๎˜ƒto๎˜ƒuse๎˜ƒthe๎˜ƒSunny๎˜ƒDay๎˜ƒDyno.๎˜ƒThe๎˜ƒSunny๎˜ƒDay๎˜ƒDynamometer๎˜ƒis๎˜ƒa๎˜ƒ
simple๎˜ƒtool๎˜ƒwhich๎˜ƒmeasures๎˜ƒRPM.๎˜ƒWith๎˜ƒthe๎˜ƒSunny๎˜ƒDay๎˜ƒDynamometer๎˜ƒand๎˜ƒa๎˜ƒstopwatch,๎˜ƒ
you๎˜ƒwill๎˜ƒbe๎˜ƒable๎˜ƒto๎˜ƒestimate๎˜ƒthe๎˜ƒtorque๎˜ƒand๎˜ƒrotational๎˜ƒvelocity๎˜ƒof๎˜ƒa๎˜ƒsmall๎˜ƒmotor.๎˜ƒPlease๎˜ƒ
follow๎˜ƒall๎˜ƒinstructions๎˜ƒcarefully๎˜ƒand๎˜ƒuse๎˜ƒthe๎˜ƒattached๎˜ƒformula๎˜ƒsheet๎˜ƒto๎˜ƒhelp๎˜ƒyou๎˜ƒwith๎˜ƒ
your๎˜ƒcalculations.๎˜ƒThe๎˜ƒSunny๎˜ƒDay๎˜ƒDyno๎˜ƒdevelopment๎˜ƒteam๎˜ƒrecommends๎˜ƒthe๎˜ƒuse๎˜ƒof๎˜ƒeye๎˜ƒ
protection,๎˜ƒgloves,๎˜ƒelbow๎˜ƒpads,๎˜ƒsmiles,๎˜ƒand๎˜ƒcommon๎˜ƒsense๎˜ƒwhile๎˜ƒoperating๎˜ƒthe๎˜ƒSunny๎˜ƒ
Day๎˜ƒDyno.๎˜ƒ๎˜ƒ
Tools:๎˜ƒ
The๎˜ƒdynamometer๎˜ƒis๎˜ƒmade๎˜ƒof๎˜ƒtwo๎˜ƒpieces:๎˜ƒa๎˜ƒhandheld๎˜ƒcontact๎˜ƒtachometer,๎˜ƒand๎˜ƒan๎˜ƒ
inertial๎˜ƒdisk.๎˜ƒThe๎˜ƒinertial๎˜ƒdisc,๎˜ƒor๎˜ƒmeasuring๎˜ƒdisc,๎˜ƒis๎˜ƒbrittle๎˜ƒand๎˜ƒshould๎˜ƒbe๎˜ƒtreated๎˜ƒwith๎˜ƒ
care.๎˜ƒTo๎˜ƒattach๎˜ƒthe๎˜ƒmeasuring๎˜ƒdisc๎˜ƒto๎˜ƒthe๎˜ƒtachometer,๎˜ƒinsert๎˜ƒthe๎˜ƒtachometer๎˜ƒshaft๎˜ƒinto๎˜ƒ
the๎˜ƒmatching๎˜ƒreceptacle๎˜ƒin๎˜ƒthe๎˜ƒcenter๎˜ƒof๎˜ƒthe๎˜ƒdisc๎˜ƒuntil๎˜ƒthe๎˜ƒsmall๎˜ƒperpendicular๎˜ƒalignment๎˜ƒ
bar๎˜ƒon๎˜ƒthe๎˜ƒtachometer๎˜ƒshaft๎˜ƒis๎˜ƒseated๎˜ƒproperly.๎˜ƒA๎˜ƒstopwatch๎˜ƒis๎˜ƒincluded๎˜ƒfor๎˜ƒtime๎˜ƒ
measurements.๎˜ƒ
๎˜ƒ
๎˜ƒ
๎˜ƒ
pf3
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Download Sunny Day Dyno Instructions: Measuring Motor Torque and Rotational Velocity - Prof. Matthe and more Study Guides, Projects, Research Mechanical Engineering in PDF only on Docsity!

Dynamic Dynamometer Instructions

Dayโ€Kaylorโ€Walton

Precision Rotational Velocity and Variable Revolutions Per Minute Two Radius

System for Force Calculations and Torque Conversion

or

Sunny Day Dyno

Deโ€Obfuscation Document

By Brian Kaylor

Introduction: Thank you for choosing to use the Sunny Day Dyno. The Sunny Day Dynamometer is a simple tool which measures RPM. With the Sunny Day Dynamometer and a stopwatch, you will be able to estimate the torque and rotational velocity of a small motor. Please follow all instructions carefully and use the attached formula sheet to help you with your calculations. The Sunny Day Dyno development team recommends the use of eye protection, gloves, elbow pads, smiles, and common sense while operating the Sunny Day Dyno. Tools: The dynamometer is made of two pieces: a handheld contact tachometer, and an inertial disk. The inertial disc, or measuring disc, is brittle and should be treated with care. To attach the measuring disc to the tachometer, insert the tachometer shaft into the matching receptacle in the center of the disc until the small perpendicular alignment bar on the tachometer shaft is seated properly. A stopwatch is included for time measurements.

Procedure:

  1. Weigh the measuring disc by itself and calculate the radius by measuring the diameter of the disc. Record these values.
  2. Calculate your motorโ€™s shaft/gear radius by measuring the shaft/gearโ€™s diameter with dial calipers. Record this value.
  3. Ensure that the tachometer switch is on the middle โ€œRPMโ€ setting, and locate the โ€œonโ€ button on the side of the unit. This button must be held down to activate the display.
  4. Connect your motor to a power source, then position the measuring discโ€™s outer edge against the rotating shaft/gear of your motor so that the motor causes the measuring disc to rotate.
  5. Press the โ€œonโ€ button on the tachometer and observe the RPM reading. After the reading has stabilized, record the RPM value. This is the maximum RPM value.
  6. Stop the motor and disc. Have one group member stand ready with the stopwatch. Start the motor from rest, and record time it takes for the measuring disc to go from rest to the maximum RPM value.
  7. Turn off all equipment and proceed to Calculations.

Calculating motor RPM is more simple. The motor and measuring disc are in direct contact, so their outer edges travel the same โ€œdistanceโ€ while rotating. By comparing their circumferences you can calculate the RPM of the motor: RPM2r* (^) disc ฯ€ = RPM (^) motor2rmotor gear* ฯ€ or: RPM (^) motor = RPMr* (^) disc /rmotor gear Conclusion: Now that you have calculated the torque and rotational speed of your motor, all that remains is to calculate the propagation of uncertainly with partial derivatives and graph the instrument calibration with error bars. Just kidding! Thatโ€™s next semester.