Electrical and Electronics: Module 15

Module 15A: Alternating Current Motors (Optional)

Suggested time: 20 . 25 hours

Level: Advanced

Prerequisites: Modules 2, 13

Foundational Objectives

To analyze circuits and predict the output.
To increase self-esteem from success with equipment, materials and techniques used.
To become knowledgeable of the various principles and characteristics of electricity and electronics.
To use appropriate terminology for electricity or electronics in context.
To demonstrate the safe use and knowledge of meters and hand and power tools used in the electrical industry.

Common Essential Learnings Foundational Objectives

To understand electromagnetic induction and its application to the use of motors.
To identify and work with various types of fractional horsepower motors. (TL)
To work safely and cooperatively with others. (PSVS)

Learning Objectives	Notes
INDUCTION MOTORS
15.1 To explain the motor operating principle of an induction motor. (COM)	Using an induction motor, examine inductance and the interaction of magnetic fields.
15.2 To explain the principle of starting used in split phase motors.	Students may take apart a split phase motor and examine how it works.
15.3 To identify the parts of a split phase motor.
15.4To list several types of split phase induction motors. (COM)	Students review and examine the different types of split phase motors. Students will match motor type to appropriate purpose.
15.5 To draw schematic diagrams of different types of split phase induction motors. (IL)	Students may disassemble several types of motors and draw schematic diagrams based on what they discover.
15.6 To identify the leads on a split phase motor.	Using a multimeter, students take apart a motor and identify the different leads. (PSVS)
15.7 To connect and run a split phase motor. (TL)	Have students wire a split phase motor to the correct voltage. Students will reverse the direction of the motor rotation by changing the direction of current flow.
15.8 To identify safety devices used on induction motors. (CCT, NUM)	Identify internal overload devices on a motor. Determine the size of overload needed for a given motor.
15.9 To perform basic trouble-shooting on an AC motor. (CCT, PSVS)	Use the appropriate meters to determine problems students may encounter on certain motors. Students should understand the importance of the cooling systems and the enclosures of certain motors.

Module 15B: Alternating Current Motors (Optional)

Suggested time: 10 . 20 hours

Level: Advanced

Prerequisites: Modules 2, 13

Learning Objectives	Notes
SHADED POLE MOTOR
15.10 To identify the shading coil in a shaded pole motor. (CCT)	Students should take a shaded pole motor apart and label all the parts. (PSVS) Use a meter to identify the different windings on a shaded pole motor.
15.11 To explain the principles of operation in a shaded pole motor. (COM)	Using a shaded pole motor, explain how the rotating field is created.
15.12 To draw a schematic diagram of a shaded pole motor. (COM)	Have students draw the schematic wiring diagram of a shaded pole motor. Students wire a shaded pole motor to the appropriate voltage. Students will reverse the direction of the motor rotation by changing current direction. Compare the starting torque of the shaded pole motor to that of a split phase motor.
UNIVERSAL MOTOR
15.13 To explain the operation of an AC universal motor compared to a series DC motor.	Students should take apart a universal AC motor and compare it with a DC series motor.
15.14 To identify the parts and windings of a universal motor.	Have students take apart a universal motor and draw a schematic diagram of it.
15.15 To connect a universal motor to the correct operating voltage. (TL)	Connect a universal motor to proper current source. Demonstrate, in a controlled setting, what would happen if a load was no longer attached to the motor. Change the direction of rotation of the motor.
15.16 To compare starting torque of a universal motor with that of an induction motor. (CCT)
15.17 To list several uses for a universal motor. (COM)	Discuss with students where a universal motor may be used.