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).
Comparing the performance of Bosch, Bijur, and Westinghouse starter motors and generators.
| Identifier | ExFiles\Box 23\2\ Scan046 | |
| Date | 27th April 1920 | |
| X.1086. Oyl - M 27.4.20. April, 27th 1920. To: Mr. F.{Mr Friese} H.{Arthur M. Hanbury - Head Complaints} Royce. Copy to Mr. E.F. Clark. Copy to Mr. Barrington. Copy to Mr. Nadin. Copy to Mr. Manning. Copy to Gardner. Copy to Mr. Belnan. From: Mr. Olley. Re: Starter Motors and Generators. BOSCH MOTOR COMPARED WITH BIJUR AND WESTINGHOUSE. X.3893. X.954. X.294. X.1058. X4304 X.543. X.4007. X3578 X.1086. X.3231. The American Bosch Company, of this city, have submitted sample starter motor and generator, together with performance curves. We have now received three motors and generators - the Bijur, Westinghouse, and Bosch. I attach photostat prints of three charts taken from the charts submitted with the machines, showing:- 1...Torque against amps. 2...Torque and H.P. against R.P.M. 3...R.P.M. against current. On the Torque curves in the second chart, the dotted lines at the low R.P.M. are intended to represent roughly the probable stalling torques taking account of battery resistance. Electrically speaking, the Bosch Motor corres- ponds closely to our own or to the C.A.V. and Lucas which we tested in 1918, showing a maximum efficiency of about 60% at 120 amps., and developing about 12 ft. lbs. torque for 200 amps. its maximum H.P. is about 1.2. The Bijur gives closely double the torque and H.P. for a given speed and consumes roughly double the current The Westinghouse results show an even greater consumption of current for a given torque, partic- Contd. | ||