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).
Page detailing motor testing procedures including intermittent load, torque, pinion, and insulation breakdown tests.
| Identifier | ExFiles\Box 168a\2\ img038 | |
| Date | 9th April 1931 guessed | |
| -7- (11) INTERMITTENT LOAD TEST. Still with the same brake load applied, the motor shall be switched on and off for several times in succession. (N.B. It will be noted that in switching off the motor, it is preferable that S1 be opened before S2). It should be on and off for about 5 seconds each alternately for a period of 3 minutes. During the test the motor should be observed for satisfactory engagement, general running particularly noisiness, and disengagement, also in particular the commutator and brushes should be watched. (12) DROP-OUT TORQUE TEST. Now make a test of the minimum torque on the brake wheel which will allow the motor to maintain in contact the main switch operating circuit contacts on the motor, the motor terminal P.D. being 9.0 +-.1. This shall not exceed 250 lb-inches or be less than 50 lb-inches. N.B. S1 should be switched off when engagement has been effected. (13) PINION EXAMINATION. Now remove motor from the rig and examine, first the pinion for sideway play on its splines which may have developed as a result of the above load tests. (14) INSULATION BREAKDOWN TEST. With the insulation still warm from the above electrical tests, an alternating voltage of 200 shall be applied through a low c.p. 200 volt vacuum lamp for 5 minutes between the armature and field windings and the motor casing, and the lamp shall show no signs of being lighted. | ||