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 from Dayton Engineering Laboratories discussing third-brush-regulated versus voltage-control type generators.
| Identifier | ExFiles\Box 31\1\ Scan044 | |
| Date | 12th November 1919 | |
| ( copy. ) THE DAYTON ENGINEERING LABORATORIES CO. Dayton, Ohio. November 12, 1919. Mr Maurice Olley, Eng'r.{Sir Henry Royce} Rolls-Royce of America, Inc., 701 City Realty Bldg., Springfield, Mass. Refer: Oy3-D101119. Dear Sirs;- Replying to yours of the 10th: We are making generators both of the third-brush-regulated type and of the voltage-control type. I should say that over 95% of our equipment is supplied with Third-brush regulation, because, on account of its simplicity and generally satisfactory performance, it has been almost universally adopted. We are not using the mercury-bath voltage regulator, but are making a very satisfactory vibrating-type regulator which was used as standard equipment in connection with the Delco ignition used on all Liberty engines. Theoretically and from the battery stand-point the voltage regulator is the ideal system to prevent over charging of the battery, but in practice it has been found that batteries are so seldom overcharged that this form of regulation is unnecessarily complex. We supply voltage regulation for jobs such as fire engine equipment, because the engine is likely to be in service pumping for all the way from 24 to 48 hours at a stretch and a generator driven at maximum speed for this length of time would overcharge the battery. In the ordinary passenger car and even in commerical car service, however, this condition is seldom met with. We have lately been doing some very interesting development work in connection with both a motor-generator and separate units of starting and lighting equipment which we believe would interest you, and I am asking Mr. O.L. Harrison, our Sales Manager, to have one of our Sales Engineers get in touch with you, if this has not already been done. We shall be very glad to have an opportunity to study your requirements, and either to adapt some of our present equipment or to design something to meet your particular conditions. Yours very truly, (signed) W.A. Chryst. Chief Engineer. Wm.A.Chryst. | ||