Approximately 90% of all industrial applications use three phase induction motors. Why? The standard utility service is three phase, 60 hertz. It is the most practical motor for uses requiring over five horsepower. Special mechanical or electrical features for unusual conditions can be readily incorporated into a three phase induction motor.
The purpose of this home study guide is to familiarize you with AC motor fundamentals and motor terminology.
AC motors are used all over the world in residential, commercial, industrial and utility applications, and U.S. Electrical Motors manufactures a wide variety of these motors for a wide variety of applications.
A thorough understanding of this material will give you the ability to select and price the right AC motor for you or your customer’ s application. We hope that you find the format of this course user-friendly; it has been designed to provide you with simple, straightforward answers to your AC motors questions.Motor development began in the 1800’ s with Oersted and Faraday’ s research on magnetism, and Sturgeon’ s development of the electromagnet in 1825. Davenport received the first patent on an electric motor in 1837. By 1890, AC generating stations came into being, but many diverse routes were being taken at this time. Edison was working in his Pear Street station – on DC.
The city of Manhattan was on DC, Niagara Falls was generating at 25 cycles, California at 50 cycles, and Philadelphia was utilizing two phase power.
National Electrical Manufacturers’ Association (NEMA).NEMA will be referred to frequently in this course; they have established standards for a wide range of electrical products, including motors. NEMA is primarily associated with motors used in North America. The standards developed represent general industry practices and are supported by the motor manufacturers. These standards can be found in NEMA Standard Publication No. MG-1.
source:http://electrical-engineering-portal.com
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