Re: Delco Remy Generator Questions 6v or 12V?

Posted by Gerald J. on February 10, 2007 at 11:45:10 from (67.0.102.106):

In Reply to: Delco Remy Generator Questions 6v or 12V? posted by Gene Cockrell on February 10, 2007 at 11:19:45:

If wound for the same shaft speed, a 12 generator armature and field will have smaller wire than a 6 volt. Ratio of about 1.4:1 diameter, 2:1 cross section.

Shaft speed complicates things. Holding the same field excitation, simply turning the shaft twice as fast on a 6 volt generator makes 12 volts. Increasing the field current with shaft speed held constant increases the output voltage. That's limited by the magnetic saturation of the field cores along with the armature core.

The angle of wires leaving the commutator depends on which layer was put on last but it can affect the brush position.

The 6 volt starter worked for decades. If if won't crank with heavy duty (How heavy? 00 gauge is heavy, 2 isn't.) cables and battery, then there is need for starter attention. I believe in replacing bearings as well as brushes and solenoid and Bendix. Worn bearings (usually bronze bushings, simple sleeve bearings) let the armature drag on the pole pieces and that really kill shaft horsepower. When brushes are replaced they need to be sanded to the contour of the commutator and that commutator should have been turned and then the micas cut so they aren't touched by the brushes. Driving a worn out starter with 12 volts is like kicking a dead horse, doesn't make it work that much better for long.

Besides sturdy cables, the connections need to be clean through out the starting system.

Gerald J.

Replies:

• Re: Delco Remy Generator Questions 6v or 12V? Gene Cockrell 15:23:43 02/11/07 (0)

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