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 use of a condenser to manage inductive discharge in primary and secondary windings.
| Identifier | ExFiles\Box 4\5\ 05-page082 | |
| Date | 13th June 1920 guessed | |
| -13- Contd. current is almost entirely of the nature of an arc or inductive discharge. The factors which would render this not exactly of this nature, would be the distributed capacities of the secondary and primary windings. In the actual practical case it is impossible to have the perfect break above referred to, so to reduce the inductive discharge at the primary contact points, it is necessary to place a condenser in parallel with these points, of such a capacity that its effect in momentarily storing up the energy of the primary discharge, is to make the rate at which the primary current falls and the primary voltage across the points correspondingly rises, slow enough to prevent the maintenance of such a discharge. It being thus necessary to provide a condenser, it is desirable to consider the phenomena immediately following the instant of break on the supposition, which is not very far from the truth, that with a condenser of suitable capacity no inductive discharge at the primary points occurs. At the same time we will consider in the first instance the secondary winding to be open circuited and not to be provided with a discharge gap, also the distributed capacity effect of the secondary to be negligible; this amounts to considering the secondary circuit absent from the core for the time being. At the point of break, the stored up inductive energy, due to the current in the primary winding, is available for setting up an oscillatory current between the inductance composed of the primary winding, and the capacity, composed of the | ||