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European & World Chapter

Fundamentals of DC Operation and Repair Tips

  • February 2020
  • Number of views: 132

Event date: 4/7/2020 - 4/8/2020 Export event

Event Location: Sulzer // Sulzer

The seminar will cover DC machine theory and operation, as well as repair tips. Topics will include testing and winding of armatures, fields, interpoles and compensating windings, machine work, balancing, assembly and final testing. The theory portion is structured so that it can be grasped by entry-level personnel, while the overall material is in-depth enough that those with 30 years of experience or more will benefit.

Partial list of topics covered in the seminar include:

  • DC machine operation explained pictorially
  • Importance of symmetry to proper performance
  • Disassembly, test & inspection tips
  • Comparison and explanation of electrical test methods
  • Data-taking tips, with emphasis on critical information
  • Commutation and commutation difficulties
  • Armature and field winding tips
  • Field compounding
  • Assembly tips & test methods
  • Accessories, including tachometers
  • Troubleshooting techniques

The accompanying book is not meant to replace the many good texts that cover the theory and design of DC machines, but to supplement them. Its purpose is twofold: to help the technician understand DC machine theory without complex formulae; and in a larger sense, to record in one place the repair procedures and tips usually learned the hard way during a long career of DC machine repair. It may take a decade or longer for a technician to become proficient and knowledgeable. We hope this book will cut many years from that timeline.

The text begins with DC theory (no math, we promise!), and then follows the logical progression of a DC machine through the service center. Disassembly, inspection and testing are covered in the initial chapters.

Subsequent chapters are organized around the main parts of a DC machine. The final chapters cover assembly, final testing and application issues. Sections focusing on components explain how those parts work, how they are made and how they can best be repaired.

Repair tips gleaned from EASA members’ decades of experience are liberally sprinkled throughout the book. While many texts about DC machines explain how they should work, this is the first (to our knowledge) to discuss all the exceptions that a repairer is liable to run across during a lifetime of working with DC machines. These might otherwise be labeled “lessons learned the hard way,” except that the reader can benefit from having all these special cases collected in one source. When possible, it is better to learn by reading than by trial and error; otherwise, the first encounter with a unique design can result in a painful “learning experience.”

A DC machine can be used interchangeably as a motor or generator, simply by changing the connection. Any DC motor can be driven and used to produce power, and any DC generator can be motorized to provide mechanical power. Although this text predominately refers to “motor;” the material applies to both motors and generators.

As with the other EASA publications—Principles of Large AC Motors, Mechanical Repair Fundamentals of Electric Motors, and Root Cause Failure Analysis—each section is designed to stand alone. The small amount of duplication is intentional, to save the reader from flipping back and forth between sections.

Course trainer - John Allen
After graduating from UMIST with a BSC in Electrical Engineering & Electronics, John started his working life in 1970 as an electrical design engineer. He is an authority in our industry, and is also representing EASA in IEC Ex committees and working as an independent engineer and Trainer.

£900 GBP (EASA Members)
£1000 GBP (Non-members)

Click here to register


Chapter Officers

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Mr. Derry Sheehan


Mr. David G. Griffin

General Manager

Mr. Frederic Beghain

Director - Region 9

Mr. Mathis Menzel, Sr
Menzel Elektromotoren GmbH

Chapter Members

Click a company's record below to view all the details.

ABB Pte., Ltd.2 Tuas Ln Singapore 638611 Singapore65-6-8619722 
Abu Adel Engineering & Mechanical Services Est.Salwa Industrial Area St. No. 15, Gate No. 35 Doha Qatar974-44600235http://www.aaes.net
Actemium Maizieres Motor & Drive70 Ronte de Metz 57280 Maizière- Lès-Metz France33-387-801683http://www.actemium.com/en/
Advanced Oilfield Technology Co., LLCRuwi Muscat 112 Oman968-24503744http://www.aotcglobal.com
ADYARDPlot No. 10 Mussafah Abu Dhabi 7604 United Arab Emirates971-2-554-7722http://www.interserve.com
Aerospace Engineering Group, S.L.Poligono Industrial EL Campillo, Bloque 1D 48500 Abanto Y Ciervana Vizcaya Spain34-94-6363711http://www.aerospacengineeringroup.aero
AIG Pumps and Seals17 Ray Craib Crescent Beacon Bay East London, Eastern Cape 5205 South Africa043-740-0241http://www.aigpumps.co.za
Al Samamat Industrial ServicesP. O. box 31749 Light Industrial Park Ibn e Sina Street Yanbu Al Sinaiyah, Kingdom of Saudi Arabia 41912 Saudi Arabia966-1-43254047http://www.alsamamat.com
Al-Barq Electric CenterSayhat Street Al-khodariya Industrial City Dammam, Eastern Province 31433 Saudi Arabia966-5-94456655http://www.bec.engineering
Alconza Berango S.LArana Bidea 13 48640 Berango Bizkaia Spain34-94-668-0011http://www.alconza.com
Alfanar Technical ServicesPO Box 35388 Jubail Industrial City 31961 Saudi Arabia966-1-33418777http://www.alfanartechnicalservices.com
Al-Huwais Arabian Est.Dammam Industrial Area Dallah-Sanaiyah Dammam, Riyadh 31434 Saudi Arabia966-3-3822-3091http://www.alhuwaisarabian.com
Almarshad Group for GeneratorsRiyadh Takhassussi St Riyadh 11485 Saudi Arabia966-1-12422690http://www.almarshad.com
Arabian Qudra Co.Rabwa-Exit 13 Riyadh 11485 Saudi Arabia966-1-4934557http://www.arabianqudra.com
Ashoor Electric Motors2652 Alhada St., Alfaisalya Dist. (2) Off Madina Rd. Kilo-9 Jeddah 21452 Saudi Arabia966-1-26391687http://www.ashoormotors.com
Assemblin El ABElektrikergatan 3 Box 67 80291 Gävle Sweden46-104-472-4000http://www.assemblin.com
Assemblin ElverkstadKlerkgatan 18 S-70225 Orebro Sweden46-10-4726000http://www.assemblin.com
Avonmore Electrical Co., Ltd.Killarney Rd, Roskeen Mallow County Cork Ireland353-22-47477http://www.avonmore-electrical.com
Bakker RepairRingersstraat 2 3364BA Sliedrecht Netherlands31-184-410555http://www.bakker-repair.com
BENNING GmbH & Co. KGMuenster Strasse 135-137 46397 Bocholt Germany49-2871-93-269http://www.benning.de
BEWBECNo. 32B Bommasandra Industrial Area Hosur Road, Bangalore, Karnataka Bangalore Karnataka 560099 India91-9900-114946http://www.bewbec.com
Cape Armature Winders (Pty) Ltd64 Killarney Ave., Killarney Gardens Cape Town, Western Cape 7441 South Africa27-21-5561488http://www.capearm.co.za
Central Electrical (A.W.) Co Ltd Trading As Central GroupKitling Road Knowsley Business Park Prescot Liverpool L34 9JA United Kingdom44-151-5466000http://www.gocentral.co.uk/
Clemessy Motors172 avenue Aristide Briand B.P. 42407 Mulhouse Cedex France03-89-32-3720http://fr.motors.clemessy.com
CLENG LtdUnit 10 Quarrbank Ind estate, Quarrybank Street Birkenhead Wirral CH41 2ZD United Kingdom44-0-151-345-6784http://www.cleng.co.uk
Coil PartnersMecidiye Mh. Selcuk Cad. No: 85 Sultanbeyl, Istanbul 34930 Turkey90-216-3122000http://www.coilpartners.com.tr
Construction De Bobinages Electriques C.B.E. Sarl34, BD Batali Med Ben Mekki Rn Casablanca 20290 Morocco212-522-408186 
CPM Engineering, Ltd.Barton Dock Rd Trafford Park Manchester M32 0ZF United Kingdom44-161-8656161http://www.cpm-uk.com
Cyclect Singapore Pte Ltd33 Tuas View Crescent Singapore 637654 Singapore65-6-8686000http://www.cyclect.com.sg/
Daniel GroupAl Quoz Industrial Area 1, 18A Street PO Box 73466 Dubai United Arab Emirates971-4-3476784http://www.danielgroup.ae