From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Analysis of a generator and motor system with variable magnetic poles, referencing a Cadillac car experiment.
| Identifier | ExFiles\Box 52\3\ Scan369 | |
| Date | 1st August 1919 | |
| Oy10-F28/8/19-3 [Diagram showing four magnetic poles around two central conductors. Top left pole is labelled 'N' and '6"'. Top right is 'N or S' and '3"'. Bottom left is 'S'. Bottom right is 'S or N'. Lines from the center point to 'Generator armature conductor' and 'Motor Armature conductor'.] 9. The smaller poles are, on the Cadillac car, made experimentally half the length of the larger, and their windings are connected in parallel with those of the larger poles through the controller, which consists of a resistance and reversing switch. Thus the small poles can be of the same sign and strength as the larger, or can be gradually reduced to zero, and increased again to opposite sign and equal strength, When the poles are equal strength and similar sign, the voltage induced in the generator armature by a given rotation speed will be three times the voltage [handwritten: back E.M.F] generated in the motor armature at the same speed, and therefore neglecting losses the motor armature (and propeller shaft) would go three times the speed of the generator armature (and engine). 10. Similarly, when the small poles are the opposite of the large, and of equal strength, the motor will go at approximately one-third of the generator speed. (Actually, due to losses, the rationof speeds would be probably more like Motor / Generator = 2 1/4 to 1 ) 11. Other advantages claimed are (1) Light weight, due to combined units and internal poles. | ||