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).
The arrangement and accessibility of motor and dynamo terminals on Phantom and 20/25 HP models, with suggestions for improvement.
| Identifier | ExFiles\Box 62\3\ scan0045 | |
| Date | 14th May 1930 | |
| X5661 COPY. AD.58. 14.5.30. X.7625. X.5620. PHANTOM AND 20/25 HP. MOTOR & DYNAMO TERMINALS. X.7660. X.5660. A point on the sequence motor is the arrangement of terminals. These are rather inaccessible on the present standard chassis but on the left-hand drive car they come close underneath the rear engine foot, and must be very difficult of access. As this model is presumably intended for the American market where accessibility is looked upon as important some modification seems to be required in the terminal disposition. As regards terminals generally, both of motors and dynamos, it is worthy of note that in Bosch machines, no terminals are exposed. This is arranged in a particularly neat way on the starter motor where the wires enter an extension of the commutator end plate casting from the driving end side leaving the cover free for removal, though it encloses the terminals. There is also a small slide on the cover through which the terminals may be reached without removing it. The terminals them-selves clamp the wires direct which are merely stripped and require no eyelet fittings, while the bushings through which they enter afford good support. The exposure of terminals is of less consequence on the starter motor than on the dynamo where, if the charging be left on, they are alive and short circuits can occur when attending to the car. The wires leading to the dynamo moreover look a rather poor job on the car being unprotected and finished with tape and string. We suggest that in conjunction with an enclosed terminal arrangement the wires could be led from the conduit to the machine through flexible brass tubing similar to that used on the switchbox. PS. HEW. points out that the wires to the ignition distributor on the Chrysler are enclosed in a flexible metal tube and the L.T. terminal is also enclosed. RJA. | ||