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).
Comparative summary of six different dynamo and regulator types, with a detailed analysis of the Aero Type U.B.
Identifier | ExFiles\Box 31\1\ Scan138 | |
Date | 3rd November 1922 | |
Contd. -6- EFC1/T3.11.22. (1) Aero type U.B. dynamo & regulator. Single pair of carbon contacts (Loaned to us for expl. with varying pressure. purposes by PN.{Mr Northey}) Resis. as shunt across field coil & also a resistance to operate. No resis. across contacts. (2) R.Bosch dynamo & regulator. Varying pressure on quantity of carbon granules between plates. (3) Bijur vibrator regulator & dynamo. Metallic contacts, shunted by resis. and with second resis. shunted across field circuit. (4) Liberty dynamo & regulator. Metallic contacts shunted by a resistor. (5) Scott Series of carbon plates with varying pressure, shunted by a resistance. (6) Westinghouse dynamo & regulator. Metallic contacts, shunted by a resistance. Aero Type U.B. This we experimented upon and reported in our EFC4/T17.8.20 and EFC5/T1.10.20. The dynamo is 2-pole 12 volts. The main operating coil is across the voltage but a resistance as a shunt across the field coil is also wound on to assist the operating coil in an additive direction. There is no resistance across the carbon contacts. These do not behave like metallic contacts as the whole variation of contact resistance is brought about by variation of pressure. Contact is never actually broken as this would reduce the excitation to zero, but in the later stages of the pressure Contd. | ||