I have an electric drill (large) it has 4 wires going to the motor, six connections on a double-pole,double throw switch and is connected to 120V AC. One of the four wires is connected to the neutral (white) of the power line, the other three must be connected to the switch to make it reversable. Can any one help?
The motor is constructed with 2 different windings in it so that it can reverse. There is a relation between the rotor and the stator; the stator has essentially 2 different windings. the only 2 things I can suggest is take it to a motor repair shop. Maybe they'll be familiar with it and tell you right there. Or you'd have to contact the manufacturer for specific wiring construction/ info. I always mark the wires before disassembly.
It is most likely this is a commutator motor with brushes and a field, the so called universal motor, meaning it works with AC or DC. Being a drill it is most likely a series motor, with field and armature coils in series. To reverse such a motor the connections to either the field or the armature are reversed. The four wires to the motor would be field and armature. The six connections to the switch allow either the armature or field to be reversed. The basic connection is the neutral goes to one end of the motor and the active goes to the other end. Now consider the reversing switch. Draw it out on paper The other end of the winding with neutral goes to one changeover pole. The Active goes to the other changeover pole. The two wires from the reversing winding go to the normally open and normally closed contacts, but are crossed over. Thus NC may be straight and NO crossed over. The 2 jumpers are the crossover from NO to NC poles.
