Podcast
Questions and Answers
What effect does lower resistance have on the current flow in an electric fan motor?
What effect does lower resistance have on the current flow in an electric fan motor?
Which setting on the selector switch corresponds to the highest resistance in the fan speed control?
Which setting on the selector switch corresponds to the highest resistance in the fan speed control?
When measuring resistance across the test points in the electric fan motor, what is the primary tool used?
When measuring resistance across the test points in the electric fan motor, what is the primary tool used?
If the resistance measured between Test Point 1 and Test Point 2 is 468 Ohms, what can be inferred about those test points?
If the resistance measured between Test Point 1 and Test Point 2 is 468 Ohms, what can be inferred about those test points?
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What will happen if the resistance setting on the fan speed control is set to the lowest resistance?
What will happen if the resistance setting on the fan speed control is set to the lowest resistance?
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What is the primary function of the electric motor in an electric fan?
What is the primary function of the electric motor in an electric fan?
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Which part of the electric fan is responsible for preventing injuries from the rotating blades?
Which part of the electric fan is responsible for preventing injuries from the rotating blades?
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In an electric fan, what is the role of the capacitor?
In an electric fan, what is the role of the capacitor?
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Which of the following correctly describes the function of the thermal fuse in an electric fan?
Which of the following correctly describes the function of the thermal fuse in an electric fan?
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What does a higher resistance in the motor winding typically indicate?
What does a higher resistance in the motor winding typically indicate?
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Which component directly supports the entire mechanism of an electric fan?
Which component directly supports the entire mechanism of an electric fan?
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What is the primary role of the stator in an electric fan's motor?
What is the primary role of the stator in an electric fan's motor?
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What describes the blade or impeller assembly of an electric fan?
What describes the blade or impeller assembly of an electric fan?
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Study Notes
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
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Description
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.
