AC stator winding to the highest quality standard.

Windings for CNC machines

The heart of the electric motor is the winding, and windings for machine tools, especially water cooled motorized spindles, require special consideration.  Some highlights of our process that guarantee proper operation and long life of your built-in spindle or other motor winding:

  • Phase relationships documented and checked so that leads are correctly labeled.
  • Non burn-out, mechanical stripping of old windings ensures that bonded lamination stacks with precision ground ODs remain in perfect condition.
  • Highly detailed winding data and schematics, including such details as exact lead length and lug size for each machine tool type, are on-screen in front of each technician during the winding process.
  • Ultra-flexible 200ºC Hitachi lead wire, the same as used at the factory by Fanuc, Mitsubishi, and Yaskawa, is used to ensure leads can be routed properly and last as expected in articulating or moving headstock applications.
  • Phase resistance measured and ensured to be within factory tolerances.
  • Windings are reproduced exactly as originally engineered-no conversions from concentric to straight pitch.

How the process works

Our process prevents core damage that may lead to costly downtime!It all begins with stripping or removing the failed winding. Our process of softening the existing varnish with moderate heat before pulling the coils mechanically is clearly superior to the "burnout" method favored by the motor repair industry. Exposing your stator core to the high temperatures of the burnout process risks damage to the insulation on the individual laminates. 

After stripping, the core is inspected and any burrs or rough edges that could damage the enamel wire are carefully removed. Class H ground wall insulation is added. Slot liners are cuffed to provide that extra protection where the coils are most vulnerable. 
A computerized winding machine optimizes coil manufacturing to produce highly consistent coils designed with minimal risk of failing turn-to-turn. 
After the coils are installed and internally connected, specially imported class H lead wire is installed. Fanuc, Yaskawa, and Mitsubishi use this product because it combines a 200C temperature rating and and high flexibility with extraordinary resistance to chemical attack. 
The completed winding is treated with a powerful epoxy varnish to protect it during service. Or better yet, completely molded into epoxy with our Epox-E-Pak process for the best protection and longest service life.



Years of experience are irreplaceable


Insertion of continuously wound coils made on a computerized machine

When your equipment is processed correctly no damage occurs
A correctly prepared Fanuc stator core ready for rewinding

Lack of knowledge can lead to machine down time
An identical stator, destroyed by the burn-off process by a traditional motor repair shop.

One more view of how a properly processed stator looks before winding
One more view of the stator core serviced by Endeavor Technologies, Inc. Make sure your equipment is treated like this and not damaged by improper repair techniques.