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).
Technical review and comparison of an American Bosch Dynamo and a Westinghouse Dynamo.
| Identifier | ExFiles\Box 31\1\ Scan080 | |
| Date | 27th September 1920 | |
| -2- Con td. X.1402 EFC3/T27.9.20. X.4030. American Bosch Dynamo recently received. This dynamo with small cutout mounted on the outside of the carcase looks externally a very poor job and many of the details which are visible when the machine is dis-assembled are poor. It is, however, a four pole machine and it is quite possible that electrically the performance may be quite good. We shall, therefore, probably investigate this in due course. The armature is wire wound by hand but in a manner which gives a symmetrical final appearance. There are no banding wires. The machine is arranged as a third brush controlled machine, the single field winding being connected between the control brush and the one main brush, hence it will be possible to compare its performance either as a shunt wound machine with other shunt wound machines, or as a controlled machine with other controlled machines. X.3966. Westinghouse Dynamo. This machine has only recently been received. The construction would appear to be somewhat better than the American Bosch. The end castings are of aluminium, but present a poor finish. The armature is hand wound with wire and in a manner which gives the finished armature an unsymmetrical bulgy appearance, which has necessitated the drilling of a number of holes for balance in the armature periphery, this necessarily reducing the electrical effici-ency of the machine. There are no armature banding wires and the appearance of the conductors in the slots is as if Contd. | ||