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).
Test results and specifications for two 50-volt D.C. motors made for Mr. Royce.
| Identifier | ExFiles\Box 34\4\ Scan192 | |
| Date | 15th October 1929 | |
| X2048. 15.10.29. PARTICULARS OF TWO 50-VOLT D.C. MOTORS FOR MR. ROYCE. The motors were made up from Phantom II dynamo parts, each machine being fitted with a 3.5" double flange pulley. Insulation of field and armature on each machine tested O.K. Drop test of armatures O.K. Field windings checked for polarity. Both O.K. Field windings tested for heating when continuously loaded at 50 volts. Both O.K. Position of brushes :- Motor 1. Practically in the neutral position. Motor 2. 3" from the neutral position. Armature speed to put up 50 volts on open circuit across brushes with normal field excitation :- 1. Speed 1850 r.p.m. Field amperes .70 2. " 1950 " " " .64 (Normal field current was, in the case of motor 2, defined as the field current taken at 50 volts after running and developing about 1/4 B.H.P. for 2½ hrs. In the case of motor 1, a field current, which corresponded to a semi-hot condition only, was used in some tests). Current to just turn armature with normal field excitation :- 1. Armature current .65 ampere " Field " .70 " | ||