Revision and rewinding of high voltage motors

Maintenance Partners has decades of experience with the maintenance and rewinding of high voltage motors. The work for high voltage motors can be divided into onsite inspections and workshop repairs.


Onsite inspections

The first inspections for high voltage motors are usually carried out on site. Dismantling the high voltage motor is usually not necessary, because we can make a “technical snapshot” using endoscopy or non-destructive material testing. The motor’s isolation value motor is determined by high voltage measurements such as DLA-measurements and Partial Discharge (PD or partial discharge) measurements. These measurements result show a clear picture of the motor’s condition and offer an indication of the remaining lifetime.

An extensive inspection can be carried out if more detailed information is required about the condition of the motor. For these extensive inspections, end-plates need to be removed to allow for elaborate electrical measurements and mechanical inspections. As part of an extensive inspection, we also perform small repairs on the windings and isolation of both the rotor and stator.

Online Monitoring

Apart from onsite inspections, Maintenance Partners also offers the option to monitor the condition of the motor while it is in operation by using online monitoring. The advantage of online monitoring is, that the motor will be measured 24 hours a day and that we can intervene if necessary.

Repairs in the workshop

If the inspections show that the operational reliability of the high voltage motor can no longer be guaranteed, an on site inspection is not enough.

During a standard revision, the motor is be cleaned and dismantled. In addition, all seals and bearings are replaced.

Rewinding of high voltage motors

In case of severe aging or damage to the windings, the only solution is to rewind the motor in most cases. The lead time for rewinding high voltage motors is often shorter than the delivery time for a replacement motor. Before we can start winding the high voltage motors, the coils have to be completely measured and reverse engineered.

Apart from winding high voltage motors in the workshop, we can also take care of the revision and replacement of laminated cores. By using the latest materials, our engineering department can improve the efficiency and life expectancy of the high voltage motor.

When the winding is finished, the motor is assembled and the mechanical and electrical aspects are checked in detail. At this stage, ultrasonic and ELCID tests are used.

Winding of a 12 Megawatt stator

An example of one of our projects is the winding of a 12 Megawatt stator for a Dutch customer. For more information about this project we recommend reading the article on our website.


For more information, call us at +32 (0)3 744 1501 or send us a message:

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