AC and DC Motor Repair

DREISILKER has mastered the art of electric motor repair. Our advanced Motor-Safe™ Repair process often improves equipment beyond its original state. This repair method is an uncompromising process which has been painstakingly perfected to result in a repair that will match OEM specs or better.

All repairs begin with thorough documentation, testing, and inspection. Rewinding starts with the original windings being carefully removed by our Motor-Safe stripping method. This method maintains the integrity of core iron and mechanical characteristics without damage. In 30 years of using this method, we have never damaged or distorted a single rotor.

All coils are wound on computerized machines for uniformity and accuracy utilizing Class H wire, phase insulation, and other insulating materials. Windings are tied down at both ends and electrically tested prior to varnishing. Stators and armatures are processed on trickle varnish machines which offer six distinct advantages over conventional dip and bake methods. Form wound coils are made in house and are completed in our Vacuum Pressure Impregnation System.

Recognizing no two repairs are alike, we also have the flexibility to meet a wide variety of customer repair requirements. We carry a full stock of replacement parts, materials, and a complete wire inventory to handle special repairs. Our many capabilities include complete machine shop services, CNC lathe, dynamic balancing, vibration analysis, transformer winding, documentation, assembly, and testing.

Take A Closer Look At Motor-Safe™ Repair

Motor-Safe Repair Versus Burnout Oven Methods


A
• Using Motor-Safe Repair, old windings are warmed, then mechanically pulled out at or below 410°F (Class H).
• Avoids damage to stator iron core; does not warp or distort iron housing.
• Burnout oven temperatures exceed 680°F which compromise integrity of core with frame damage & distortion.

B
• Using Motor-Safe Repair, stator laminations remain undamaged by heat.
• Prevents circulating “eddy” currents or hot spots; maintains iron structure, efficiency, temperature & amperage draw.
• Burnout oven damages laminations, causing energy losses into higher motor temperatures & uneven amperage draw.

C
• Motor-Safe Repair requires shorter stripping process time.
• Time-efficient method has shorter lead time.
• Time-consuming oven method, is done typically with many stators incinerated simultaneously over 8 to 12 hrs.

D
• Motor-Safe Repair produces minimal waste & uses less energy.
• Eco-friendly with minimal carbon footprint plus energy efficiencies.
• Burnout ovens have negative environmental issues plus excessive energy use.

E
• Motor-Safe Repair returns motor to OEM or better specifications.
• Energy efficiency is maintained or improved, reducing operating cost.
• Burnout oven heat results in lamination damage and core loss to increase energy costs.

F
• With Motor-Safe Repair, new windings are wound using computer-controlled technology.
• Original wire size and wiring data are recorded, to be replicated with uniformity and accuracy.
• Other shops may change specifications, substitute inferior materials, or modify original design.

G
• Using Motor-Safe Repair, advanced varnishing methods are used to extend motor life.
• Motor is cooler-running, more rigid, sealed better for specific application.
• Other shops may use one type of varnishing method for all motors and applications.

H
• Using Motor-Safe Repair, all rotating components are dynamically balanced.
• Ensures vibration-free performance and longer bearing life.
• Without dynamic balancing, bearing life is reduced and vibration issues may occur.

i
• Using Motor-Safe Repair, all motors are thoroughly tested to NEMA and IEEE standards.
• Verifies all motor functions have been restored to original condition or better.
• Without systematic testing, motor condition cannot be proven; duty life may be significantly reduced.

J
• Using Motor-Safe Repair, motor frame structure remains unchanged.
• Without distortion, motor frame holds original shape and keeps correct air gap.
• Extreme oven heating of frame changes levels of four feet, creating “soft foot” effect; also changes shape of core affecting air gap, thus creating other negative operating issues.

Results of Competitor's Burnout Methods
Burnout Oven Damage To Motors
Incoming Stator Needing Repair After Burnout Oven Damage
Detail of coil damage after competitor's burnout
Detail of lamination damage due to burnout
Lamination discoloration due to burnout
Developing a Motor Repair Specification

This Powerpoint presentation gives an overview of the DREISILKER process; Impact of Motor Repair; Studies and History; Cost of Quality; Review of IEEE Std 1068-2010. Included are: Seven Steps to Quality Motor Repairs:
1. Become better informed about motor repair and maintenance.
2. Pre-qualify and select a quality electric motor repair facility before you need it.
3. Acquire or write a set of motor rebuilding standards.
4. Establish a spare motor inventory system.
5. Request a completed motor repair report of each repaired motor.
6. Test new and rebuilt motor when they are received at your plant.
7. Maintain communication system and relationship with your repair shop.

What Makes DREISILKER Different
1985 Dreisilker Rewind Process Video


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