Although this looks like a sardine can with wires...it actually is a Bosch electric sunroof motor, from a Porsche 356. Bosch built these in 6 and 12 volt varieties and they all look similar. Bosch DID stamp a voltage identifier on the thin aluminum covers of these little buggers.
Here are all the gubbins of a sunroof motor. I put my digital caliper in the photo to give some idea of the size of the motor. The orange wires in the "U" shaped case are the dual field windings. There are actually TWO windings on each side, which is necessary to make the motor turn both directions. One way to open the sunroof, the other way to close it. The case end piece--to the right of the "U"--has the armature brushes in place. You can see the armature in the center of the photo.
These are just two of eight pages of my own HOW-TO instructions that I made as I did the reconditioning of these motors. I take a dim view of recreating the wheel and these personal instructions make it easy to remember how to do it when I get to the next motor of this type, a week, or six months from now.
I actually had three of these motors to recondition--a six volt and two twelve volt units. This is a late twelve volt motor.
Here are the three victims. Top motor is a six volt unit. Bottom left is an early 12 volt motor [which had burned out field windings] and to the right is a late 12 volt motor. Two are hot to trot to run Porsche sunroofs open and closed, the other is spare parts.
City Car Design
6 years ago