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).
Analysis of oscillation frequency, voltage, and current in a circuit with primary and secondary windings.
| Identifier | ExFiles\Box 45\3\ Scan002 | |
| Date | 16th April 1920 | |
| Contd. -2- EFC1/T16.4.20. of a large number of turns, so that some portion of the energy of the medium frequency medium voltage oscillation in the low tension circuit is given out as a high frequency high potential discharge on the secondary circuit. It would appear that the battery and contact breaker should only be looked upon as a means of supplying stored magnetic energy to the circuit in the first instance. (Incidentally, another way would be to supply in the first instance, stored di-electric energy to the condenser by connecting this to a 500 or 600 volt battery momentarily, then allowing it to discharge through the primary coil). In the absence of the secondary winding, the condenser capacity and primary inductance are such that the oscillation frequency of the circuit would be about 2,500 and the amplitude of voltage on both condenser and primary coil about 600. In the presence of the discharging secondary the oscillation frequency is materially increased to an extent dependent upon the coefficient of the magnetic coupling. The result is that during the high tension discharge, an oscillation of frequency of the order of 10,000, voltage amplitude of the order 600, and current amplitude of the order of 10 amperes, exists in the primary circuit. Our point in making the above remarks is that such an oscillation is rather a different thing to deal with as regards contacts than is an ordinary lighting current or than a battery current rising in value in the circuit 0386 D 16.1.20 DFT SD G/001 TYPED R.B | ||