18-07-2012, 08:02 PM
Hi Rob, they are a simple circuit, but can create a lot of interference fron the brushes if not suppressed (and sometime when they are!).
The motor is basically a shunt wound 240v ac/dc machine with the armature and field commoned at one end to neutral. The other end of the field goes to mains L. The other end of the armature goes via the rheostatic foot pedal to mains L. The light is also wired in there as well. Note that the field winding is often energised at all times it is plugged in.
Hope this helps, Ed
The motor is basically a shunt wound 240v ac/dc machine with the armature and field commoned at one end to neutral. The other end of the field goes to mains L. The other end of the armature goes via the rheostatic foot pedal to mains L. The light is also wired in there as well. Note that the field winding is often energised at all times it is plugged in.
Hope this helps, Ed
