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).
Specifications for a Peerless Starting Dynamo, detailing its components including the brush holders, armature, and field coils.
| Identifier | ExFiles\Box 68\4\ scan0163 | |
| Date | 15th January 1914 | |
| X.1640 X.121C. Peerless Starting Dynamo 6 volts. 200 amps. 1200 r.p.m. Brush Holders. Type Bosch type of two each. Brushes. Eight. Carbon & Graphite & (supposed) German Silver 1" x 1" x ½" Gear. Fixed. Connections. Braided copper wire, sweated into thimble and screwed into brush. Springs. Tension on brushes, by ribbon springs of silicon bronze .250" x .040" with 4½ convolutions. See sketch. Area of brush. Covering two segments of commutator. X.1640. Armature. Core. Laminated. 28 S.W.G. Length 8" dia. 6". Commutator. 32 commutator bars. Commutator bridges half way. Ends to every 4 bars about .093" square section copper wire. See sketch. Winding. .093" square section copper wire. Two layers parallel wound, former wound. Size. Width 2¼" dia. 3¾" X.3331. Field Coils. Core. Laminated. 28 S.W.G. each insulated. 140 laminations per pole. No. of poles. Two, in series in parallel. See sketch. Winding. Wire No.10 S.W.G. See sketch for further particulars. Area per pole. Cover five segments of core. sgd. A.J.B. 15.1.14. | ||