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EASA Tech Notes

  • January 2019
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The latest revisions of EASA Tech Notes are now included as part of the EASA Technical Manual (as of 2012). Tech Notes will no longer be issued as separate documents once they have officially be incoporated into the EASA Technical Manual.

The list below will help you locate these latest revisions.

List updated 10/1/2019

Number Title Page of the EASA Technical Manual
1 Hoist Troubleshooting Withdrawn
2 Function of the Interpole in DC Machines 3-29
3 Connecting the Variable-Speed Commutator Motor 2-175
4 Frog-Leg Windings for DC Machines 3-49
5 Dynamometer Testing Electric Motors 7-30
6 New International Connection Diagrams for Foreign 6- and 12-Lead Wye-Delta Motors 2-40
7 Suffixes to NEMA Frames 2-6
8 Understanding Motor Efficiency and Power Factor (replaced with The Impact of Voltage and Frequency Variation on Motor Life and Performance) 2-83
9 TIG-Welded Commutator Connections 3-47
10 Winding Connections for Multi-Mode Three-Phase Motors 2-165
11 Voltage Stresses in Three-Phase, AC Motors (Withdrawn and replaced with: Voltage Stress: Not as Simple as It Sounds) 2-218
12 Conversion Factors for Lap and Concentric Windings 2-188
13 Solid Round Magnet Wire Data 6-2
14 The Commutator and Its Maintenance 3-41
15 Some Aspects of Magnetic Centering Effects on Sleeve Bearing Induction Motors 10-97
16 Guidelines for Maintaining Motor Efficiency During Rebuilding 2-99
17 Stator Core Testing Withdrawn
18 Troubleshooting a DC Motor at the Job Site 3-53
19 Lubrication of Rolling Bearings in Electric Machines Withdrawn
20 Cause and Analysis of Anti-Friction Bearing  Failures in AC Induction Motors (Now titled: The Cause and Analysis of Bearing Failures in Electric Motors) 8-33
21 Thrust Anti-Friction Bearings for Vertical Motors (Now titled: Understanding and Adjusting Thrust Rolling Bearing Systems for Vertical Motors) 8-23
22 Brushholders and the Performance of Carbon Brushes 3-33
23 Testing of Squirrel Cage Rotors 7-27
24 UL 1446 Systems of Insulating Materials 6-18
25 Rewinding Inverter Duty Motors 2-221
26 Can Energy Efficient Motors Be Rewound Satisfactorily? (replaced with The Effect of Repair/Replace
on Motor Efficiency)

The Cause and Analysis of Bearing and Shaft Failures in Electric Motors
• Bearing Failures
• Shaft Failures


28 Assuring the Mechanical Integrity of Electric Motors 10-4
29 Application Considerations of Pulse-Width Modulated Inverters 5-33
30 Fabrication of Replacement Shafts For Electric Motors 10-119
31 The Cause and Analysis of Stator and Rotor Failures in AC Induction Machines 2-120
32 Standards for Dynamic Balancing 10-17
33 Taking Data on Form-Wound Motors and Generators 2-235
34 PWM Amplifiers 5-8
35 Rewinding Form-Wound Motors and Generators 2-241
36 Armature Banding With Fiberglass 10-93
37 Interspersed Windings: What Are They? 2-153
38 Repairing Sleeve Bearings 8-42
39 Procedure Writing: It Takes A Little Time, But The Results Are Worth It Withdrawn
40 An Analytical Approach to Solving Motor Vibration Problems 10-27
41 Electric Motor Shaft Analysis 10-115
42 Procedures for Checking End Play in Ball Bearing Machines 8-50
43 Making and Installing a New Motor Shaft 10-123
44 Guide for Procuring Form Wound Coils for Motors and Generators 2-239
45 Servo Drives 5-24
46 The (Potential) Pitfalls of Parallel Circuits 2-211
47 Concentric-to-Lap / Lap-to-Concentric Conversions 2-177
48 Squirrel Cage Rotor Testing See Section 7
49 Simple Troubleshooting of Amplifiers in the Field 5-17

Categories: Technical topics
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Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 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
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  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

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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

EASA Technical Manual cover

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.