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).
Procedure for conducting light and load tests on a motor, including specifications for torque, current, and speed.
| Identifier | ExFiles\Box 70\4\ scan0145 | |
| Date | 30th January 1925 guessed | |
| -3- should exceed 80% of the total. Running the light test on the motor considerably improves the bedding of the brushes for the load test, so that under the circumstances, as above, the light test should be allowed to run even though the current may not fall below the limit in the first instance. Brushes should be carefully inspected for freedom in the holders without excessive clearance. A brush which is "sloppy" never gives as good results as one with the minimum clearance, provided it is quite free. Test 2. LOAD TEST. The motor and gear shall be loaded up by means of a rope brake, to a torque lying between the limits 300 and 305 pound-inches, and run for 15 minutes on a 12 volt battery of ample capacity. (The above torque figure is given for brake wheel in place of motor sprocket. On the production test rig in which the brake wheel is driven from the motor by means of a chain transmission, an allowance will have to be made for the efficiency of this, which may be about 95% but should be determined by experience. On the supposition of 95% efficiency the torque figures should lie between the limits 286 and 290 pound-inches). During the last five minutes of the test, the current must not exceed 120 amperes, and the geared down speed must not be less than 17.0 times the motor | ||