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 description of a motor's construction, components, and weight.
| Identifier | ExFiles\Box 23\2\ Scan060 | |
| Date | 29th September 1920 | |
| Contd. -2 EFC4/T29.9.20. by rivets to the commutatoreend plate with an additional ring of insulation between the two. The end plate is of the colour of aluminium but is decidedly heavier. The bearing at the commutator end is not bushed but the shaft runs in contact with this same metal. There is a lubricating pad pressing against the shaft at one side, corresponding to which there is an oil reservoir cast on the end plate. The far (power) end bearing would appear to be bushed with a similar far-end metal and similarly to be provided with a lubricating pad and reservoir. The power end plate is of cast iron arranged for spigot mouting. Long-itudinal bolts from one end plate to the other hold the machine together. The armature and commutator do not present a good finish. The armature is wound with single turn former shaped varnished conductors of round rectangular section; the only insulation for these consists in the slot insulation and tape wound round the end connections on every alternate bar. There are no banding wires. Each commutator segment is composed of two halves which are just plated together in the assembly. The lines of demarcation can be distinctly seen along the middle of the segment. Presum-ably this is to facilitate construction. The brush contact area of this machine is liberal and the brushes are of the colour and hardness similar to our standard C.M.3. The weight of the motor complete is 26 lbs. 1.oz. EFC. | ||