1. 1 LAB 3: Product Analysis ENG H192 Hands-on Lab

2. Fundamentals of Engineering – Honors – ENGR H192 2 Objectives: Product Analysis  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.

3. Fundamentals of Engineering – Honors – ENGR H192 3 Contents: Product Analysis  Power Conversion and Approximation  Schematic Components  Motor Discussion

4. Fundamentals of Engineering – Honors – ENGR H192 4 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.

5. Fundamentals of Engineering – Honors – ENGR H192 5 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.

6. Fundamentals of Engineering – Honors – ENGR H192 6 Schematic Symbols Commonly Used Symbols: DC SourceAC SourceMotorGround ResistorCapacitorFuseSPST Switch N.C. Push Button Switch N.O. Push Button Switch Female Connector Male Connector

7. Fundamentals of Engineering – Honors – ENGR H192 7 Part II Shaded-Pole Motor Lecture

8. Fundamentals of Engineering – Honors – ENGR H192 8 Breakaway View Laminated Core Rotor Stator Winding Poles “Shaded” with Copper Wire

9. Fundamentals of Engineering – Honors – ENGR H192 9 Shading Theory Shading Coils Rotor Stator Winding

10. Fundamentals of Engineering – Honors – ENGR H192 10 Shading Theory

11. Fundamentals of Engineering – Honors – ENGR H192 11 Shading Theory

12. Fundamentals of Engineering – Honors – ENGR H192 12 Shading Segments

13. Fundamentals of Engineering – Honors – ENGR H192 13 Flux Wave Rotation

14. Fundamentals of Engineering – Honors – ENGR H192 14 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. Fundamentals of Engineering – Honors – ENGR H192 15 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: