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 the construction and operation of a regulator and brush system for an electrical machine.
| Identifier | ExFiles\Box 31\1\ Scan075 | |
| Date | 17th August 1920 | |
| S. R.{Sir Henry Royce} 586A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 648, 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 9518 Contd. -2- EFU4/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" in 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 skrewed. The spring mechanism by which the brushes are held on the commutator is rather crude and admits of no adjustments for wear, the pressure being exerted on the brush by means of a simple single bow spring. The regulator is of the vdtage control type employing carbon brushes 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 actuating the vibrator is connected directly across the terminals of the machine and is of 86 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 Con d.{John DeLooze - Company Secretary} | ||