Description

Course Objective

• Identify the components of an AC Motor and explain their function.
• Explain the basic principles of magnetism.
• Interpret the characteristics of a current as represented on a sine wave.
• Describe the effect of AC current on a conductor.
• Describe the methods of increasing magnetic flux in a conductor.
• Explain how a rotating field is created in an AC Motor.
• Explain and be able to calculate synchronous speed.
• Explain induction and its effect on a rotor.
• Explain the relationship between phased current and rotor spin.
• Explain slip and know its formula.
• Describe the design of a squirrel cage rotor and function of components.
• Describe the design of a wound rotor and function of a wound rotor’s components.
• Define torque and explain its role in motor operation.
• Explain the design of a reluctance motor and how it works.
• Explain the design of an externally excited motor.
• Explain how an externally excited motor works.
• Explain the function of a motor starter and the most common types of motor starters.
• Describe a variable speed drive and its effect on voltage and frequency.
• Distinguish a single-phase motor from a three-phase motor.
• Explain the design of a split-phase motor and how it works.
• Explain the design of a capacitance start motor and how it works.
• Identify the general characteristics and advantages of a DC motor.
• Identify the basic components of a DC motor.
• Explain the function of DC motor components.
• Identify the components of the armature and brush assembly; explain their function.
• Explain the effect of armature current on the main flux field and motor action
• Explain the process of commutation and how it maintains direct current in a DC motor.
• Describe how the number of windings and commutator segments effects torque and mechanical power of a DC motor.
• Explain how armature reaction shifts the neutral plane in a DC motor.
• Explain how armature reaction affects motor operation.
• Explain what measures will correct armature reaction.
• List the requirements for induced voltage in a motor.
• Explain counter-EMF.
• Explain the design of a series wound DC motor and how it works.
• Explain the design of a shunt wound DC motor and how it works.
• Explain the design of a compound wound DC motor and how it works.
• Explain the design of a permanent magnet DC motor and how it works.
• Explain how a universal motor runs off of DC power.
• Explain the design of a brushless DC motor and how it works.
• Explain why a reduced voltage starter is sometimes needed in a motor.
• Explain how a reduced voltage starter works.
• Explain what determines the direction of rotation of a DC motor.
• Explain how a reverse contactor works.
• Explain how to control the speed of a DC motor.
• Explain how a tapped resistor works.
• Explain a DC drive’s control system and how it works

Included Modules

1. Introduction to AC Components and Motors: This is the first lesson in the AC/DC Motor Theory Course. This lesson identifies the components of an AC motor and explains their functions. Basic magnetic principles, sine waves, methods of increasing magnetic flux in a conductor, and how a rotating field is created in an AC Motor are presented.
2. Advanced AC Motor Principles: The second lesson in the AC/DC Motor Theory Course, this lesson explains synchronous speed and how to calculate it. The lesson demonstrates the relationship between phased current and rotor spin and induction and its effect on a rotor. Slip and how to calculate slip using its formula are also covered.
3. Three-Phase Motors – Part 1: This is the third lesson in the AC/DC Motor Theory Course. This lesson defines and explains the components and functions of various three-phase motors. The lesson also defines torque and explains its role in motor operation.
4. Three-Phase Motors – Part 2: This is the fourth lesson in the AC/DC Motor Theory Course. This lesson defines and explains the components and functions of externally excited motors, starters, and variable speed drives. There is also a review topic to reinforce the information covered in the lesson, Three-Phase Motors – Part 1.
5. Single-Phase Motors: This is the fifth lesson in the AC/DC Motor Theory Course. This lesson trains the participants to distinguish single-phase motors from three-phase motors. Split-phase motors and capacitance start motors are discussed.
6. Introduction to DC Motors: This is the sixth lesson in the AC/DC Motor Theory Course. This lesson introduces the learner to DC Motors and their basic components.
7. Introduction to DC Motor Theory: This is the seventh lesson in the AC/DC Motor Theory Course. The lesson introduces participants to DC motor theory.
8. Armature Reaction, Compensation, and Induced Voltage: The eighth lesson in the AC/DC Motor Theory Course, this lesson demonstrates armature reaction, compensation, and induced voltage.
9. Series, Shunt, and Compound DC Motors: This is the ninth lesson in the AC/DC Motor Theory Course. This lesson instructs the participant in the design of series wound, shunt wound, and compound DC motors and how they work.
10. Permanent Magnet, Universal, and Brushless DC Motors: This is the tenth lesson in the AC/DC Motor Theory Course. This lesson instructs the student in the design of permanent magnet, universal, and brushless DC motors and how they work.
11. DC Motor Controls: This is the final lesson in the AC/DC Motor Theory Course. This lesson trains participants in starters, rotation direction, speed control, and drive controls of DC motors.