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 experimental testing and performance of a Bosch dynamo and regulator.
| Identifier | ExFiles\Box 31\1\ Scan139 | |
| Date | 3rd November 1922 | |
| Contd. -7- EFC1/T3.11.22. a small arcing effect occurs. The open circuit voltage control of this is not very flat but grows considerably with the speed. The curves of ampere output for the controlled condition are somewhat irregular and we should think the control under actual service conditions would be liable to be rather erratic. R.{Sir Henry Royce} Bosch. We carefully experimented with the Bosch dynamo and regulator on the bench and reported upon these in our EFC1/T21.1.21 and EFC2/T14.2.21. The parts of a combined cutout and regulator were also sent to Mr. Royce for his examination. We found it was necessary for this regulator to work in a vertical position, but even then the performance on load was a little erratic. On our bench tests at any rate the open circuit volt-speed characteristic was very flat rising only a small amount with the speed. Apparently there are two stages of regulation, the first stage being due to the want of pressure on the carbon graniles, and the second stage being due to a contact intermittently short circuiting the field winding of the dynamo and so keeping the excitation down at very high speeds, in such a way that there is no top limit of speed to the range of control. We found there was trouble due to this latter contact sticking, and apart from this and the slight irregularity in the control, the behaviour generally seemed to be very good. Contd. | ||