AAV’s Motor Rewinding Sales and Service provides a range of services for electric motors, including:

Vibration Analysis
Complete Repair of Servo Motors
Electric Motor Rewinds up to 750HP
Bearing Sales, Selection and Installation
VPI Windings available upon request
Class H Insulation & Inverter Duty Wire used in All Rewinds
Motor repair from Fractional HP to 750HP, 12 to 575 Volts
Resistivity, Hi-Pot, Megger©, Surge Test & Electrical Diagnostic Testing

All motor rewinds are done using Class H insulation and inverter duty wire, ensuring that the motor can withstand high temperatures and frequent starts and stops. AAV repairs electric motors ranging from fractional HP to 750HP and 12 to 575 volts. We also offer various electrical diagnostic tests, including resistivity, hi-pot, Megger©, and surge tests, to ensure the motor is operating at its optimal level.

AAV's EASA AR100 Certified Motor Rewinding

Advanced Air and Vacuum is a trusted provider of electric motor services, boasting over 150 years of combined experience in the industry. We have built a reputation for excellence by providing reliable and high-quality services to our clients. In addition to our wealth of experience, Advanced Air and Vacuum is EASA AR100 accredited. This accreditation is an internationally recognized standard for electric motor service centers, which signifies that we have demonstrated a commitment to quality and excellence in our work. As an EASA AR100 accredited service center, we have undergone a rigorous auditing process to ensure that our facilities, equipment, and personnel meet the highest standards of professionalism and expertise. This combination of experience and accreditation makes Advanced Air and Vacuum a top choice for those in need of electric motor services.

winding copper on the grill to size, rewinding an electric motor

Signs you May Need a Motor Rewind:

If you have been informed that your electric motor requires rewinding, it means that the coils have been damaged, shorted, or grounded in some way. There are numerous underlying issues that lead to motor failures, which usually manifest themselves as insulation failures or grounded/shorted coils. Insulation failures may occur in several forms, such as shorted turn-to-turn or phase-to-phase windings, coil-to-coil, or grounding at the slot’s edge. These problems may be caused by contamination, abrasion, voltage surges, the machine’s age, or vibration. Thermal deterioration is another common cause of motor insulation failures, resulting from poor connections in the motor terminal, high currents in the stator due to a locked rotor, excessive load demands that surpass the motor’s rating, or excessive reversals and starts.

Some signs that a motor may need to be rewound include:

  • The motor is making unusual noises or vibrations
  • The motor is overheating
  • The motor is drawing more current than usual
  • The motor is producing less power than it should be
  • The motor is failing to start or is starting slowly
  • The motor is emitting a burning smell or smoke

If any of these signs are present, it is important to have the motor inspected by one of our professional motor rewind technicians to determine if rewinding is necessary.

AAV's Motor Rewind Process

  1. Strip windings
  2. Rewind coils using a computerized machine for an ideal regularity & accuracy
  3. Rewind materials (like copper and insulation)
  4. Electronically test the windings
  5. Process stators and armatures through varnish machines to complete rewind


  1. What is a motor rewind? → Motor rewinding is a process of replacing the copper wire coils and insulation inside an electric motor’s stator or rotor. This process is typically done to restore the motor’s functionality after it has experienced damage or wear.
  1. When is Motor Rewinding necessary? → Motor rewinding is necessary when an electric motor’s coils or insulation become damaged, worn, or fail. This can result in decreased performance, increased energy consumption, or complete motor failure. Rewinding the motor can restore its performance and functionality and is often a more cost-effective solution than replacing the entire motor.
  1. How long does motor rewinding take? → The time required for motor rewinding can vary depending on the size and complexity of the motor, as well as the extent of the damage. Typically, though, the process can take anywhere from a few days to several weeks to complete. One of our professional motor rewind technicians can provide you a more accurate estimation after they have assessed the condition of the motor.
  1. Can any type of motor be rewound? → Most types of electric motors can be rewound, including AC motors, DC motors, and servo motors. However, the rewinding process can be more complex for some types of motors, such as those with multiple winding layers or specialized insulation requirements. It is important to consult with a professional motor rewinding service provider to determine if a specific motor can be rewound.
  1. Is it better to rewind a motor or replace it with a brand new motor? → Whether it is better to rewind a motor or replace it depends on several factors, including the extent of the damage, the age of the motor, and the cost of a replacement motor. In some cases, rewinding a motor can be a cost-effective way to extend its lifespan and restore its functionality. That being said though, if the motor is significantly damaged or outdated, it may be more cost-effective to replace it with a newer, more efficient model. One of our professional motor service providers can provide guidance on the best course of action for your specific motor.