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).
Cost-benefit analysis and wiring loss implications of Fynn-Meichsel design induction motors.
| Identifier | ExFiles\Box 76\2\ scan0094 | |
| Date | 6th March 1928 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. BY.{R.W. Bailey - Chief Engineer} Mr. Bentley of Royce Ltd. Y632 EFC2/T6.3.28. INDUCTION MOTORS OF UNITY POWER FACTOR. FYNN-MEICHSEL DESIGN. We quite agree with your impression that where the consumer is charged for watt-hours the saving of losses in his own wiring, arising out of the use of unity and leading power factor motors would be so relatively small as not to pay him for the extra first cost and trouble that might arise from the d.c. commutator, though I note from the description that the reactive voltage in these coils of the d.c. winding short circuited by the brushes is zero, or nearly so, and commutation perfect. From what I have seen, I do not think the loss in our own wiring is very serious. There appears to be a loss of the order of 10 volts between the transformer and motor terminals at which latter the line voltage is usually in the neighbourhood of 190 at full load. There would still be at least half this, even if the current drawn from the transformers was in phase with the voltage. As requested, I am passing on the pamphlet to Mr. Bentley of Royce Ltd., Trafford Park, Manchester. EFC. | ||