07-12-2021, 07:32 PM
(This post was last modified: 07-12-2021, 07:57 PM by Bob Culver.)
The dyn is the 4 pole DEL model with parts not directly interchangeable with later. Identifiable by the closed end. Nothing cannot be fixed but there are a myriad dud Seven dynamos in the world. An insert could be turned up , but machining tubular pieces for press fits and bearing housings is time consumimg. And the cracks are extensive although probably OK with the light loading. I presume it has been working merily as is.It is hard to imagine what disaster would cause so much fracture and cracks. The model has two ball races; it is important these are not preloaded against each other or the smaller rigidly located (altho not much risk as is!).
This is the model originally with a functioning Summer resistance incorporated with part of the field winding. mf you have not already found, one of the Club sites covers in detail.
If ithe winding chances to be still there and OK, most disconnect.
If stuck for an intellectual challenge ,figuring the armature winding and mode of operation of a 4 pole dyn with only 2 main brushes is no mean exercise!
This is the model originally with a functioning Summer resistance incorporated with part of the field winding. mf you have not already found, one of the Club sites covers in detail.
If ithe winding chances to be still there and OK, most disconnect.
If stuck for an intellectual challenge ,figuring the armature winding and mode of operation of a 4 pole dyn with only 2 main brushes is no mean exercise!