Function

An integral part of each traction motor is the armature coil rotor with the extensive electrical windings which develop the rotating field in the motor.

The armature coil rotor has a complex shape disc on one end of the rotor shaft which serves as an end plate, containing the windings and acting as a structural feature.
The main shaft is friction welded on the inside face of the disc; a smaller pinion shaft is press fit into the outer face of the disc.

An Example in Steel Casting Traction Motor Rotor Disc