This manual covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on IEC motors and standards.
Anyone who has spent much time reading the EASA AC Motor Redesign book, or motor design textbooks, will recall that there are certain stator-rotor slot combinations that can detract from the performance of an electric motor.
Most of these are readily identified by counting the number of stator slots and rotor bars, then comparing the difference to the table presented in this article. The number of poles is a factor, which is why we should always consult the table when changing motor speed.
Topics discussed in this article include:
- Stator slot-rotor bar combinations
- Motor starting
- What is rotor skew
- Benefits of rotor skew
- Operating on reduced voltage
Getting The Most From Your Electric Motors
This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
- Installation, startup and baseline information
- Operational monitoring and maintenance
- Motor and baseline installation data
- How to read a motor nameplate
- Motor storage recommendations
Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
EASA Technical Manual
Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.