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).
Letter clarifying the operational parameters for a Warren Motor regarding voltage and frequency variations.
| Identifier | ExFiles\Box 165\4\ img069 | |
| Date | 29th May 1930 | |
| X6023 ON ADMIRALTY, WAR OFFICE AND INDIA OFFICE LISTS. CONTRACTORS TO H.M. GOVERNMENT DEPARTMENTS, AND TO THE PRINCIPAL ELECTRIC LIGHT AND POWER UNDERTAKINGS. WORKS:- COLINDALE WORKS, HENDON, N.W.9. Telegrams: WORKS, "EVERGENDOS, HYDE, LONDON." LONDON OFFICES, "EVERECTUS, SOWEST, LONDON." Telephone: WORKS, 6045 COLINDALE (2 LINES) LONDON OFFICES, 3020 VICTORIA (2 LINES) EVERETT, EDGCUMBE & CO LTD ELECTRICAL & MECHANICAL ENGINEERS. MANAGING DIRECTORS KENELM, EDGCUMBE, M.{Mr Moon / Mr Moore} INST. C.E., M.I.E.E. PATRICK HAMILTON, B. Sc., M.{Mr Moon / Mr Moore} INST. C.E., M.I.E.E. 117, VICTORIA STREET, WESTMINSTER, LONDON, S.W.1. REFERENCES YOURS: EFC3/AD. OURS: D/RB{R. Bowen} 1069. 29th May, 1930. Messrs. Rolls-Royce Ltd., DERBY. Gentlemen, Warren Motor. With reference to your letter of the 26th Inst., we regret that our remarks were not clear. We certainly appreciated the point in your letter of the 20th Inst., viz. the fact that when both voltage and frequency vary in direct proportion to each other the range over which the instrument can be relied upon to run synchronously is limited to between 50% and 120% of normal, both as regards frequency and voltage and furthermore the motor cannot be relied upon to start if the voltage and frequency are less than 80% of the normal. On the other hand the motors will run synchronously at any speed up to 120% of normal, providing the voltage is maintained at the normal value. The above figures were obtained from actual tests. Individual motors might however show a slight improvement on this range. Yours faithfully, for EVERETT, EDGCUMBE & CO., LTD., [Signature] Director. All quotations are estimates only and are subject to the Terms of Business and Conditions of Sale stated in our Current Catalogue. The customer's order shall not be binding on us unless and until such order has been accepted by us in writing. | ||