Course Title: AC and DC Motors

Delivery Medium: Video Tapes

Course Overview: This comprehensive training program consists of four lessons that train participants to understand, maintain, and test AC and DC motors.

Intended Audience: This program is excellent for the training of electricians and electronic technicians as well as for the multi-craft training needs of process and manufacturing facilities.

Associated Course Lessons

Lesson Title: Lesson 1- AC Motor Theory

Lesson Prerequisite: This lesson is designed for participants familiar with Ohm's Law and 3-Phase Motors.

Lesson Description: This lesson shows and explains the principles upon which AC motor operation is based, the basic components of an AC motor and how they work, and the types of motors commonly found in the industry, their design, how they are different and where they are commonly used.

Lesson Outcome: Upon successful completion of this lesson, participants will be able to 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 explain the function of its components; describe the design of a wound rotor, and explain the function of its components; define torque and explain its role in motor operation; explain the design of a reluctance rotor and how it works; explain the design of an externally excited motor and how it works; explain the function of a motor starter, and describe the most common types; describe the function of 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; and explain the design of a capacitance start motor and how it works. Upon successful completion of this lesson, participants will be able to 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 explain the function of its components; describe the design of a wound rotor, and explain the function of its components; define torque and explain its role in motor operation; explain the design of a reluctance rotor and how it works; explain the design of an externally excited motor and how it works; explain the function of a motor starter, and describe the most common types; describe the function of 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; and explain the design of a capacitance start motor and how it works. Upon successful completion of this lesson, participants will be able to 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 explain the function of its components; describe the design of a wound rotor, and explain the function of its components; define torque and explain its role in motor operation; explain the design of a reluctance rotor and how it works; explain the design of an externally excited motor and how it works; explain the function of a motor starter, and describe the most common types; describe the function of 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; and explain the design of a capacitance start motor and how it works.

Lesson Title: Lesson 2- AC Motor Maintenance

Lesson Prerequisite: This lesson is designed for participants who are familiar with basic electrical principles and electrical safety, and preferably with AC motor theory.

Lesson Description: This lesson covers basic AC motor maintenance procedures including preventive maintenance inspection, cleaning, and lubrication as well as motor disassembly, cleaning and inspection, motor reassembly, and post-maintenance testing. This lesson also presents common motor problems and corrective actions that may be taken.

Lesson Outcome: Upon successful completion of this lesson, participants will be able to identify characteristics of a motor maintenance program; identify types of motor maintenance; identify safety procedures to use during motor maintenance; identify reasons for having and categories of information for a record-keeping system; select appropriate motor maintenance tools and instruments for given tasks; identify characteristics of preventive motor maintenance; inspect a motor for general maintenance and for identifying problems; take measurements of current, temperature, and vibration; clean and lubricate a motor as warranted by a preventive maintenance inspection; identify characteristics of periodic motor maintenance; identify the major components of an AC motor; perform pre-maintenance testing: winding insulation resistance and winding resistance; disassemble a motor, clean and inspect a disassembled motor; reassemble a motor and perform post-maintenance testing; identify causes and corrective actions for a motor that won't start, or for a motor with abnormal noise or for a motor overheating, or for a motor with overheated bearings.

Lesson Title: Lesson 3- DC Motor Theory

Lesson Prerequisite: This lesson is designed for participants who are familiar with Ohm's Law and 3-Phase Motors.

Lesson Description: This lesson explains the basic components of a DC motor and how they work; the principles upon which DC motor operation is based; the types of motors commonly found in industry, how they are different, and where they are commonly used; and the procedure and devices used to control a DC motor.

Lesson Outcome: Upon successful completion of this lesson, participants will be able to identify the characteristics and advantages of DC motors; identify the components of a DC motor; identify an armature and its components; identify a brush assembly and its components; understand motor action, flux fields and magnetic fields; identify commutators, their components and function; understand the affects of adding coils to a commutator; understand armature reaction and how to correct it; identify compensating windings and interpoles; understand CEMF and motor speed; identify common DC motor types such as series-wound, shunt, compound and permanent magnet motors and their usage; identify universal motors and their usage; understand reduced-voltage motor starters; understand constant torque and horsepower; identify direction of rotation and polarity; understand reversing DC motors and variable speed drives.

Lesson Title: Lesson 4- DC Motor Maintenance

Lesson Prerequisite: This lesson is designed for person who are familiar with basic electrical principles and electrical safety, and preferable with AC and DC motor theory and AC motor maintenance.

Lesson Description: This lesson presents information about DC motor maintenance, including commutator inspection and maintenance as well as brush maintenance. It explains various types of commutator problems and how to remedy these problems and describes how to select, install, and seat brushes.

Lesson Outcome: Upon successful completion of this lesson, participants will be able to identify differences between AC motors and DC motors; identify components of a DC motor commutator and their functions; identify factors that affect commutation; describe the color of the commutation and explain the function of the oxide film; identify wear patterns including streaking, threading and grooving and their causes and corrective actions; identify the causes of arcing and corrective actions; identify the causes of high mica and corrective actions; identify the causes of uneven segments and corrective actions; identify the causes of thrown solder and corrective actions; explain how to prepare a commutator for reconditioning; describe how to clean and check the commutator after maintenance; describe how to inspect various aspects of a brush; identify the factors to be considered when selecting brushes; identify the procedures for cleaning and inspecting the brush holders; identify the steps involved in setting the height of the brush holder; identify the procedure for installing brushes; explain how to seat brushes, and explain how to adjust spring pressure.

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