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).
Comparison of Westinghouse generators and starting motors with the company's own equipment.
Identifier | ExFiles\Box 23\2\ Scan076 | |
Date | 4th November 1921 | |
OLLS-ROYCE - 8 - m/earlh 4/11/21 Samples for Mr. Belknap's car will have this material between the coils and the frame. Mr. Olley has been furnished a sample sheet of this material. 5. COMPARISON OF ROLLS-ROYCE & WESTINGHOUSE EQUIPMENT. 1. GENERATORS: The main advantage the 77 BR generator has over the Rolls-Royce Smith generator, is that the Westinghouse generator and regulator automatically control the current supplied to the battery. When the battery is fully discharged 12 to 15 amps. is supplied, while when the battery is fully charged, this current is automatically reduced to 3 1/2 to 4 amps. The only effect temperature has on the Westinghouse system is to raise the speeds at which the given outputs are obtained. For a given setting of the regulator, the same current is supplied by the generator for both hot and cold conditions. Our generator will supply 13 to 15 amps. continuously, while the tests we have made on the Smith generator show that it will supply only 8 to 9 amps. continuously, under the same conditions. The Westinghouse generator weighs 27 lbs. 14 ounces, while the weight of the Smith generator is 32 lbs. The performance of the Rolls-Royce and Westinghouse generators are shown on our curves 102174, 102174.1, 102175, 102175.1, 102176, and 102176.1. It will be noted that on a fully charged battery, beyond 2,000 R.P.M. the current supplied to the battery increases. This feature should not be objectionable, as this condition will not often exist, and then only for short times, and no injury to the battery will result. 2. STARTING MOTORS: Partial comparison of the two motors has already been given above. The main advantages of the Westinghouse GG motor over the Rolls-Royce Lucas motor, are performance and weight. The Westinghouse motor is so designed as to give higher efficiency and greater horse power at the higher current and torque values where these are most needed. This is shown on our curves 102167, 102168, and 102170. The weight of the Rolls-Royce Lucas motor is 30 lbs., and the weight of the Westinghouse 56 CG motor is 20 lbs. 8 ounces. The following table shows the comparison of the two motors when operating under identical conditions on the same battery. | ||