This program explains AC motors in detail. The general operation of three-phase (3?) and single-phase (1?) motors is reviewed as well as the components that form a motor. Also covered in detail are the three different types of single phase capacitor motors.
The start and acceleration methods of Full-Voltage (Across-The-Line) and Reduced-Voltage are presented. The program explains in detail the five types of reduced voltage starts which include: Primary resistor, Autotransformer, Wye-Delta, Part winding and Solid-state.
Also presents in detail the operation of reversing AC motor circuits using drum switches, manual, and magnetic starters. Accelerating and decelerating circuits are also explained, along with braking techniques using friction brakes, plugging switches and electric braking. Multi-speed motors are also covered including constant torque, constant horsepower and variable torque.
This module also includes a thorough explanation of troubleshooting AC motors and what symptoms to look for to avoid motor failures. Also presented is the topic of 1? and 3? AC motors starting and working but not correctly and how to identify its causes and how to fix the problems.
|