Motor Controlled Appliances Quiz - Electric Fans

Electronic Products Assembly and Servicing (EPAS)

• Subject: Maintain and Repair Consumer Electronics
• Course: Motor Controlled Appliances
• Student: Marie Conception S. Tura
• Grade Level: TVL-11

Lesson Objectives

• Identify external and internal parts of an electric fan, explaining their functions
• Measure motor winding resistance using an ohmmeter

What is an Electric Fan?

• A type of electronic appliance, run by an electric motor
• Converts electrical energy to mechanical energy
• Designed to provide comfort during hot periods

What's the Purpose of an Electric Fan?

• Convert electrical energy into mechanical energy
• Provide comfort during hot weather

External Parts of an Electric Fan (Table Top Fan)

• Base: Supports the entire mechanism, typically houses the on/off switch (regulator) with adjustable speeds (low, medium, high)
• Motor Housing: Contains the electric motor (rotor) to which the blade assembly is attached
• Blade/Impeller Assembly: Cuts and directs air
• Blade Guard: Protects from injury
• Plug: Connects to the power source
• Power Cord: Connects to the power supply

Internal Parts of an Electric Fan

• Electric Motor: Main part producing mechanical energy for propeller rotation
• Stator: Non-movable part providing electromagnetic energy to the rotor
• Rotor: Movable part of the motor that rotates
• Copper Winding/Coil: Set of copper wire supplying electricity to stator and rotor
• Capacitor: Used to start and make the fan spin by creating a magnetic flux (torque)
• Thermal Fuse: Safety device that opens circuits when overheating due to over-current, short circuit, or component failure
• Selector Switch/Control Switch: Allows intensity control of the airflow

Motor Resistance

• Higher resistance means a lower current leading to slower propeller rotation
• Lower resistance means a higher current leading to faster propeller rotation

Fan Speed Control

• Different settings on the selector switch correspond to varying resistances needed for different rotation speeds (high, moderate, low)

Schematic Diagram

• Diagram shows electrical connections for different fan speeds and components (capacitor, thermal fuse, speed control)

Motor Terminals/Test Points

• Six coloured wires in an electric motor, connected to windings within the stator
• Called test points; used to measure winding resistance

How to Measure Resistance of Motor Winding/Coil

• Use digital multimeter/tester
• Place probes between test points to measure resistance between those specific winding points

Activity I

• Measure resistance between each test point and record results in a table

Test your knowledge on the assembly and servicing of electric fans in this quiz. Learn about the internal and external parts of an electric fan, including their functions and measurement techniques. Ideal for TVL-11 students in the Motor Controlled Appliances course.