Stultz Electric Motor & Controls: Electric Motor Repair

Electric Motor Repair
Many times, it is more economical to repair or rewind than to replace your electric motors and generators. We will inspect and advise you as to what is your most cost effective option. All repairs and rewinds are delivered back to you in better than new condition backed by our repair warranty. Our facilities are equipped to handle repairs, rewinds and overhauls in-house to 40 ton/8000hp. Please contact Luci Woods at for more information.


  • Standard and Custom Rewinds including:
    • Low voltage AC random rewinds up to 600 volts
    • Medium voltage AC formed coil rewinds 2300, 4160 and 6900 volts
  • Armature rewinding
  • DC stator field rewinding
  • Wound rotor motor rewinding
  • Motor rebuild and custom reports include:
    • Over 800 different tests, conditions, or data inputs
    • Permanent data base records of all data collected during the repair process
    • Over twenty-five custom formats of repair procedures
    • Incorporation of custom tests, or specific instructions from customers, into the motor repair procedure
  • Commutator replacement or rebuilding
  • Pump rebuilding
  • Gear box rebuilding
  • Hoist and crane rebuilding
  • Brush holder redesign and replacement
  • Endbell bearing housing bushings with compatible materials
  • Shaft repairs or replacement
  • VPI Vacuum Pressure Impregnation (Epoxy Resin)
  • Complete rotor re-barring
  • Dynamometer Load testing
Testing Services

The Schulz Group offers a wide variety of testing to ensure that your electric motor or generator will exceed your performance expectations.

  • AC Testing to 13,800 volts/DC Testing to 800 volts
  • Dynamometer testing: AC horizontal to 1500hp/1000hp vertical
  • Core loss testing, conventional or utilizing digital EL CID
  • Data Acquisition systems including the ADRE system by Bently-Nevada
  • Hipot, surge, and power factor testing of all size motors and generators
  • Switchgear testing and maintenance

Vacuum Pressure Impregnation Systems (VPI)

A motor winding that undergoes VPI is virtually impervious to oil, moisture, and chemical contaminants.

  • VPI provides a 100% solid mass structure that gives you the greatest mechanical strength.
  • A cooler running motor due to superior heat dissipation, with the highest level of environmental protection.
  • Used for AC and DC motor stators, armatures, field coils, transformers, and applications such as lifting magnets.

Dynamic Balancing

Proper balancing promotes longer bearing life. Nearly anything that rotates, or is supported in bearings that allow it to rotate, needs balancing to ensure quality performance and equipment reliability. The Schulz Group can provide dynamic balancing to 20,000 lbs.

Laser Alignment

Laser alignment increases operating time of equipment, increases productivity, and decreases down time. Laser alignment, performed by a properly trained technician, provides more accurate alignment than feeler gauges or dial indicators, in less time.

Replacement Coils and Winding

All coils are inspected for fit, finish, electrical soundness and dielectric integrity. Coils are Hi-Pot tested to ensure insulation values and surge tested at 100% of the determined original test voltage.

  • Armature Coils
  • Brake Coils
  • DC Field & Interpole Coils
  • 13,200v available
  • AC Synchronous Field Coils
  • 460v AC to 6000v AC VPI Form >Wound Stator Coils
  • Specialty Control Coils


Predictive & Diagnostic Services:
  • Infrared Thermography
  • Vibration Trending & Analysis
  • On-Line Motor Testing
  • Dynamic Balancing & Laser Alignment


Hydro-Generator On-Site Repair:

Photos, rebuild listing, available services, ...



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Stultz Electric Motor & Controls
1 McAlister Farm Road, Portland ME 04103
Ph: 207-699-2501  Fx: 207-699-2508