Basic Electricity - Senior Secondary 2 - Types and features of AC motor

Types and features of AC motor

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TERM: 1ST TERM

WEEK TEN

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: TYPES AND FEATURES OF AC MOTOR

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.)  Identify the types of AC generators

II.) State the features of AC motor

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher identify and discuss the types of AC generators

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher highlights some of the important features of AC motor and discuss them

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

TYPES AND FEATURES OF AC MOTOR

Types of AC motors

There are several types of AC motors, including:

  1. Single-Phase Induction Motor: These motors are commonly used in household appliances and small machinery. They have a single-phase power supply and typically utilize a split-phase or capacitor start-capacitor run design.
  2. Three-Phase Induction Motor: These motors are widely used in industrial applications due to their efficiency and reliability. They have a three-phase power supply and can be either squirrel cage or wound rotor types.
  3. Synchronous Motor: These motors operate at a constant speed and are synchronized with the frequency of the AC power supply. They are used in applications where precise speed control is required, such as in synchronous clocks, fans, and pumps.
  4. Brushless DC Motor (BLDC): Although technically not an AC motor, BLDC motors are often driven by AC power through electronic speed controllers (ESC). They are efficient, low-maintenance, and widely used in applications such as electric vehicles, drones, and computer cooling fans.

Features of AC motor

The main features of AC motors include:

  1. Stator: The stationary part of the motor that contains the coils of wire (windings) that produce the rotating magnetic field.
  2. Rotor: The rotating part of the motor that interacts with the stator's magnetic field to produce motion.
  3. Bearings: Support the rotor shaft and reduce friction for smooth operation.
  4. Enclosure: Protects the internal components of the motor from environmental factors such as dust, moisture, and debris.
  5. Cooling System: Helps dissipate heat generated during operation to prevent overheating and prolong motor life.
  6. Mounting Configuration: AC motors can be mounted in various configurations, such as foot-mounted, flange-mounted, or face-mounted, depending on the application requirements.
  7. Efficiency and Power Rating: AC motors are rated based on their efficiency, power output, and speed characteristics to ensure they meet the requirements of the intended application.

EVALUATION: 1. Mention 4 types of AC generators you know and explain them

  1. Identify 5 features of an AC motor

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively