Electric Motor Maintenance and Troubleshooting

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Electric Motor Maintenance and Troubleshooting

Introduction

 Electric Motor Maintenance and Troubleshooting

    Effective electric motor maintenance and troubleshooting require a complete understanding of a motor's internal structure. The electric motor theory in this text is directly relatable to maintenance and troubleshooting. The math and motor theory are not meant to be used as exact formulas for designing or redesigning a motor or an electrical system. Instead, they are directly applied to motor problems and solutions. The book covers all types of AC and DC motors. DC motor and generator operation (and components) will be explained first, followed by AC single-phase motors, and then three-phase motors. Connections and their numbering systems are included with the description of each machine.

Planning and Control of Maintenance Systems

    Two troubleshooting procedures will be presented. The first procedure tests the machine's components to quickly see if it should be removed for repair. The next procedure locates the problem inside the machine. Although electric machine problems can be difficult, there is no problem that does not have an explanation and a solution. It's just a matter of gathering all the facts, and applying the appropriate logic.

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Table of contents

CHAPTER 1 AC Electric Motor Theory

• AC Terminology
• Inductive Reactance
• Capacitance and Capacitive Reactance
• Oil-Filled Capacitor
• Electrolytic Capacitors
• The Series Generator
• The Compound Generator
• The DC Arc Welder
• Interpoles
• Operation of a DC Motor
• The Shunt Motor
• The Permanent Magnet DC Motor
• The Series Motor
• The Compound DC Motor
• The Stabilized Shunt Motor
• Speed Control for a Compound DC Motor
• Armature Components

CHAPTER 2 Troubleshooting and Testing the DC Machine

• Armature Problems
• Brush Problems
• Neutral Location in the Stator and Armature
• Field Testing the DC Machine
• Locating Problems in the DC Machine
• Locating Problems in the Shunt Field
• Drawing Simple Schematics of a Shunt Field
• Locating Problems in the Series Field
• Identifying Leads of a Compound DC Motor with an Ohmmeter

CHAPTER 3 The Single-Phase Motor

• Shaded-Pole Motor
• Split-Phase Motor
• Thermal Protective Devices
• Alternative Start-Winding Switches

CHAPTER 4 The Three-Phase Induction Motor

• Components of the Three-Phase Motor
• Operation of the Three-Phase Motor
• Amperes and Rotor Bar Design
• Introduction to Three-Phase Motor Types
• Multispeed Motors
• Multimode Nine-Lead Three-Phase Motors
• Identifying the Triple-Mode, Nine-Lead Three-Phase Motor
• S3mchronous Motor

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