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).
Mathematical and experimental investigations into the action of a contact breaker and coil for battery ignition.
| Identifier | ExFiles\Box 52\3\ Scan289 | |
| Date | 1st February 1917 | |
| X 2814 EFC {E. Fowler Clarke - Electrical Engineer} 2/T11.1.2.17. X.3199 - MATHEMATICAL AND EXPERIMENTAL INVESTIGATIONS OF ACTION OF CONTACT BREAKER AND COIL FOR BATTERY IGNITION. X.2814 . (1). Effect on variation of speed of contact breaker. In the mathematical investigation it is assumed (a) That the ratio period of make / period of break remains constant at its dead slow value for varying speeds. (This is approximately the case up to a certain speed to be determined by instantaneous vision experiments). (b) That no residual primary current exists at instant of make. (This will be very nearly true as explained elsewhere). (c) That the ballast resistance retains its normal working value at normal speed and current consumption, as the speed is varied. (This is not true, but offers an interesting comparison between the observed and calculated curves of current consumption). Knowing the applied voltage, the normal working value of the total primary resistance, the inductance of the primary winding and the ratio mentioned in (a) above, it is possible tp find expressions for the current at the instant of break and the average current, for various speeds of the breaker. This has been done for Remy 12 and the results plotted on accompanying curves. Contd. | ||