DC motor repair rewinding tips

Whether to repair or replace a motor is a decision that must take the specific business's needs and budget into account.

08/29/2017


Whether to repair or replace a motor is a decision that must take the specific business's needs and budget into account. Courtesy: L&S Electric.Regular maintenance extends the life of an electric motor. Despite a good program, all motors fail. Failure occurs when the motor experiences a catastrophic problem or if it has simply run its course.

Rewind/repair or replace

When a motor fails, look at all options to keep productivity delays brief. It is often a matter of looking at the economic benefits associated with each option. There are two options to consider when a motor fails: rewind/repair or replace. Look at many different factors associated with the failed motor before the decision. Factors include:

  • The condition of the stator core and rotor
  • The ROI of replacement
  • The sustainability of the motor for its intended application

It is important to look at the viability and the costs involved before making a decision. Evidence of more damage only becomes apparent after disassembling the motor.

Replacing the motor

A motor failure, if bad enough, creates problems beyond the windings. A catastrophic failure results in damage to the stator core, rotor, end brackets, bearings, and shafts. If there is that much damage, replacing the motor is the best option.

Weigh the options of replacing the failed motor with a higher efficiency motor. The higher efficiency standards provide even more benefits than repairing the failed motor. Before deciding to buy a higher efficiency motor, determine all the related costs to see if a new motor is a viable choice. If the price is too high, then repairing the motor becomes a strong option.

New motor delivery

Consider the cost and timing for delivery of a new motor. If the motor in question is a large motor or one that has particular features, it takes several months before the replacement arrives. On the other hand, a standard electric motor may be in stock and the replacement is faster. Repairing the motor takes place in far less time than waiting months for a new motor to arrive.

Repairing the motor

If the decision is to repair the motor, lead times are faster than some new motor delivery schedules.

Do research

There are many electric motor repair shops to choose. Ensure that the shop you choose has guidelines for their repair services. Some shops are members of organizations that provide guidelines and certifications. Good repair shops also have a quality management system (QMS). Using the proper practices in motor repair results in no loss of motor efficiency. A repair shop tests the motor before and after the repair. These tests, check the windings for any core losses.

Ultimately, the decision to repair or replace the motor is one that needs to make sense for the specific business and budget. Electric motors represent a significant investment for any facility. If repairing a failed motor, do diligent homework on all the repair shops in the area.

David Manney is marketing administrator at L&S Electric. This article originally appeared on L&S Electric's online blog. L&S Electric is a CFE Media content partner. Edited by Carly Marchal, content specialist, CFE Media, cmarchal@cfemedia.com. 



The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
Pipe fabrication and IIoT; 2017 Product of the Year finalists
The future of electrical safety; Four keys to RPM success; Picking the right weld fume option
A new approach to the Skills Gap; Community colleges may hold the key for manufacturing; 2017 Engineering Leaders Under 40
Control room technology innovation; Practical approaches to corrosion protection; Pipeline regulator revises quality programs
The cloud, mobility, and remote operations; SCADA and contextual mobility; Custom UPS empowering a secure pipeline
Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Power system design for high-performance buildings; mitigating arc flash hazards
VFDs improving motion control applications; Powering automation and IIoT wirelessly; Connecting the dots
Natural gas engines; New applications for fuel cells; Large engines become more efficient; Extending boiler life

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
The maintenance journey has been a long, slow trek for most manufacturers and has gone from preventive maintenance to predictive maintenance.
This digital report explains how plant engineers and subject matter experts (SME) need support for time series data and its many challenges.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me