PJacobs
New member
- Apr 24, 2007
- 1
I am having difficulty in working out how to connect the grinding wheel motor in a late 1940's Black and Decker Valve Resurfacer. (B & D have no longer any drawings for this machine and were unable to help).
I was given this machine in totally dismantled condition. The 240 volt ac motor that drives the 5 inch grinding wheel has an armature with 21 poles, and there are 63 segments on the commutator.
It has three carbon brushes disposed at 90 degrees to one another around one half of the commutator, one brush holder remains connected to one end of the field winding. There are two copper wound chokes and the remains of a capacitor, but no interconnecting wiring. I recognise the chokes and capacitor(s?) are for altering the phase angles, but cannot fathom how to connect them ... none of my books deal with such a configuration.
I imagine the motor would drive the grinding wheel at around 4000rpm
Can anyone give me some direction as to how to connect the brushes and field winding via chokes and capacitors ... or perhaps direct me to a book which covers this type of machine?
I was given this machine in totally dismantled condition. The 240 volt ac motor that drives the 5 inch grinding wheel has an armature with 21 poles, and there are 63 segments on the commutator.
It has three carbon brushes disposed at 90 degrees to one another around one half of the commutator, one brush holder remains connected to one end of the field winding. There are two copper wound chokes and the remains of a capacitor, but no interconnecting wiring. I recognise the chokes and capacitor(s?) are for altering the phase angles, but cannot fathom how to connect them ... none of my books deal with such a configuration.
I imagine the motor would drive the grinding wheel at around 4000rpm
Can anyone give me some direction as to how to connect the brushes and field winding via chokes and capacitors ... or perhaps direct me to a book which covers this type of machine?