2. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 1Winter Quarter Product Analysis Lab 3

3. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 2Winter Quarter Product Analysis Objectives Combine previous lab experiences to better understand the workings of a completed product. Develop an appreciation for horsepower and wattage considerations in product design. Expand the library of electrical schematic symbols used to designate components. Develop reverse engineering skills.

4. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 3Winter Quarter Product Analysis Contents: Power Conversion and Approximation Schematic Components Motor Discussion

5. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 4Winter Quarter Power Conversion watt [for James Watt], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the amount of power that is delivered to a component of an electric circuit when a current of 1 ampere flows through the component and a voltage of 1 volt exists across it.

6. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 5Winter Quarter Power Conversion horsepower, unit of power in the English system of units. It is equal to 33,000 foot-pounds per minute or 550 foot-pounds per second or approximately 746 watts. The term horsepower originated with James Watt, who determined by experiment that a horse could do 33,000 foot- pounds of work a minute in drawing coal from a coal pit.

7. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 6Winter Quarter Schematic Symbols Commonly Used Symbols: DC SourceAC SourceMotorGround ResistorCapacitorFuseSPST Switch N.C. Push Button Switch N.O. Push Button Switch Female Connector Male Connector

8. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 7Winter Quarter Breakaway View Laminated Core Rotor Stator Winding Poles “Shaded” with Copper Wire

9. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 8Winter Quarter Shading Theory Shading Coils Rotor Stator Winding

10. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 9Winter Quarter Shading Theory

11. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 10Winter Quarter Shading Theory

12. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 11Winter Quarter Shading Segments

13. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 12Winter Quarter Flux Wave Rotation

14. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 13Winter Quarter Motor Speed Motor theory tells us that the speed of an ac motor is directly proportional to the frequency and inversely proportional to the number of poles as follows: Thus, for a 2-pole motor running at 50 hz: rpm = 120 f N p s rpm = = 3000 120 x 50 2

15. Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 3P. 14Winter Quarter Motor Slip The rotor of an induction motor will not rotate at the theoretical speed due to slip. The equation for slip is: Thus, if the anticipated rpm was 3600 and the actual rpm was 3440: