When coils are shorted, grounded or damaged, a motor requires rewinding. At Keener Electric Motors, we approach rewinding with a careful, thorough process that ensures your motor will be working like new.
Rewinding involves removing the coils, inserting and connecting new coils and insulating the complete winding.
Removing the old coils from the stator iron allows us to determine the number of wires per slot, the number of turns per coil, the span of the coils, wire sizes used, coil groups and internal connection and return the winding to factory specifications.
Collecting winding data to replicate the original motor is a critical step to ensure that any previous errors in winding are not repeated. Winding data includes the number of slots, wire size, number of coils, number of turns per coil, critical dimensions, bracing and insulation parameters.
We test the stator iron to make sure it can be reused, then place it in a burnout oven for 6-8 hours to incinerate the old varnish and insulation material. After it cools, we remove the old coils from the stator iron and determine the number of wires per slot.
The new coils are made from inverter duty coated wire on our winding machine and installed by hand on both sides of the frame. Coil ends are either tied together or with leads that run externally into the junction area for connection to the power supply leads.
All connections are insulated and tied down to ensure the leads are secured in the proper position and that coil ends cannot contact the frame or the rotor. To fill the voids, the frame and windings are submerged in varnish and baked for 6-8 hours to cure the varnish.
Motor rewind services include:
- AC 3 Phase
- AC 1 Phase
- DC Field Coils
- DC Armature
- AC 2 Speed