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).
Continued description of a voltage control regulator, detailing its components, materials, and electrical operation.
| Identifier | WestWitteringFiles\E\August1920\ Scan5 | |
| Date | 17th August 1920 | |
| Contd. -2- EFC4/T17.8.20. The front end plate and the commutator end cage in which the regulator and brush system are housed are both of aluminium; the field carcase is of mild steel of 5.93" dia. 3.25" length, thickness .375". The air gap is uniform under the pole pieces which have a ratio of polar arc to polar pitch of .8. The armature slots are not skewed. The spring mechanism by which the brushes are held on the commutator is rather crude and admits of no adjustment for wear, the pressure being exerted on the brush by means of a simple single bow spring. The regulator is of the voltage control type employing carbon contacts through which the field current has to pass. The top carbon contact is fixed and the lower one is movable and is drawn away from the top contact by means of a solenoid and plunger operating against the spring. There are two windings on the solenoid, the connections being according to the diagram herewith, one pole of the system being earthed as shown. One of the coils actuating the vibrator is connected directly across the terminals of the machine and is of 88 Ohms resistance. The second coil assisting the operation of the regulator is connected as a shunt across the field windings and is of 141 ohms resistance. This coil is wound so as to assist the first coil in drawing down the plunger. It will be seen from the diagram that when the carbon contacts are completely separated, there is no supply of Contd. R.R. 199 (250T) (SD676 19-7-17) MP 180865 | ||