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).
Technical memo discussing the design and characteristics of a motor, specifically its teezer circuit and windings.
| Identifier | ExFiles\Box 64\1\ scan0138 | |
| Date | 1st June 1923 | |
| Contd. -2- R4/M4.6.23. than the maximum flux is that the torque will increase with the square of the current and the motor speed will decrease with the load, and therefore the demand for current in the case of overload will be less, and owing to the increased efficiency of this motor and its increased torque and efficiency the drop in speed and the demand on the battery would be probably less than you would get from a motor which is at or near saturation under its normal working load. Mr. Stent has made a drawing shewing the form of thin pan cake coils for the teezer circuit, which we enclose herewith - LEC.1728. We anticipate a teezer current of from 10 to 20 amps. This will be adjusted by the resistance of the teezer circuit plus the resistance of the actuating coil. With this 10 to 20 amps. we shall expect the normal flux to pass through the motor so that we want somewhere in the neighbourhood of 400 amps. turns per pole from the teezer circuit. It will be nearly entirely resistance but the pan cake coils and the actuating coil should not be in long enough to suffer from overheating. We are suggesting that the teezer circuit shall be on all the poles and the series winding also on all the poles so as to avoid a distortion of flux under maximum load. We think also that it will be nearly as simple to construct. Contd. | ||