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).
Page describing the operation and advantages of the Smith Constant Current Variable Speed Dynamo.
| Identifier | ExFiles\Box 3\5\ 05-page180 | |
| Date | 8th March 1920 guessed | |
| Page 8 THE SMITH CONSTANT CURRENT DYNAMO. still remain equally spaced they occupy different positions with regard to the poles. This causes the effect of the armature reaction on the magnetic field to vary. Moving the brushes in the direction of rotation of the armature reduces armature reaction and increases the value of the full output of the dynamo. Moving the brushes against the rotation of the armature increases the reaction and reduces the full output. HEATING OF THE DYNAMO. If the current distribution shown in Fig. 6 be examined it will be noticed that although the dynamo output is 10 amperes only two sections of the armature winding, ab and cd, are carrying current. This means that the heating in the armature is only half what it would be in a dynamo of the ordinary type, and constitutes a very marked advantage as the heating of the machine is much reduced, and the current output does not fall off to such a marked extent when the machine is hot after a run. The chief advantages claimed for THE SMITH CONSTANT CURRENT VARIABLE SPEED DYNAMO, are :- (1). Low cutting-in speed. (2). Rapid rise of current, with full output at a low speed. (3). Reduced heating. (4). Small drop in output when hot. (5). Light weight for a given output. (6). Extreme simplicity and reliability. S. Smith & Sons MOTOR ACCESSORIES, LTD. BIRMINGHAM 22, Jackson's Row MANCHESTER GLASGOW 141, Bath Street NEW YORK, PARIS, BUENOS AYRES, MILAN, THE HAGUE, CAPE TOWN, JOHANNESBURG, SYDNEY, WELLINGTON, BANGKOK & SOURABAYA. SPEEDOMETER HOUSE 179-185 GT. PORTLAND ST, LONDON W. 1. Trade Mark "Speedwell" Show Rooms London. | ||