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).
Explanation of the functioning of dynamo-battery combinations in chassis electrical systems.
Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan201 | |
Date | 2nd June 1926 | |
THE FUNCTIONING OF THE DYNAMO-BATTERY COMBINATION OF A CHASSIS ELECTRICAL SYSTEM. SO-CALLED INHERENTLY REGULATED DYNAMO SYSTEMS. [Text is struck through] The majority of motor vehicles now-a-days are provided with a dynamo-battery combination for maintaining the required supply of electrical energy, of which the dynamo is one of the so-called self - or inherently-regulated types. There are several variations of such machines as regards the arrangement of the windings, brushes, etc. but speaking generally they all depend upon the same root principles and have mainly similar characteristics. Though so named, they are not really self- or inherently-regulated, depending as they do for effective control at varying speeds upon their being electrically soundly connected to a battery. Thus in reality it is the dynamo-battery combination which is self-regulated and in fact it may be said that it is the battery which brings about the main regulating action, a fault in the battery such as, for instance, low electrolyte, may considerably impair the regulation of the system. The main defect of all such machines is that in order that this battery regulating action shall be possible, they must be worked, at speeds at which regulation is necessary, on the lower portions of their volt-ampere characteristic curvew for those speeds, where a rise or fall of terminal voltage and ampere output occur conjointly. In this condition the speed and number of conductors on the armature are such that a considerably higher E.M.F. could be generated by the armature in the absence of the (battery) control. Contd. | ||