field coil
field winding

The field coils are connected in series or parallel with the armature winding.

Some older or simpler arrangements use a single field coil with a pole at each end.

With two suction cups he fixed a field coil over the area.

I'm turning on the field coils in exactly 2 minutes.

The outer field coils draw their power from the grid.

This field may be generated by either a permanent magnet or a field coil.

Most of these used a single transverse field coil mounted above the rotor.

His right went between the field coils and into the negatron stream.

Both dynamos and alternators required a source of power to drive their field coils.

"Anything you can do to fix the field coils in a hurry?"