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 light, armature return, and damping tests.
| Identifier | ExFiles\Box 168a\2\ img033 | |
| Date | 20th March 1931 guessed | |
| -3- (4) LIGHT TEST. The motor shall be run light on its main circuit for a period of ten minutes on a terminal P.D. lying between the limits 5.6 to 6.0. Towards the end of the run the current taken must not exceed 30 amperes, thus ensuring that the mechanical friction of the motor is sufficiently small. It will be found advisable in order to maintain lubrication of the bearings occasionally to move the armature endways towards the in-gear position. (5) ARMATURE RETURN TEST. This test consists in suitably gripping the pinion nut successively in each 60° position in its rotation, pulling out the armature to its full distance, letting it back gently to a pulled out distance of only .200, and then letting it go. In each of the six cases, it should restore itself to its fully back position and thus confirm the satisfactoriness of the damper spring and main spring control in relation to the frictional forces involved in the motor bearings and damper piston. (6) ARMATURE DAMPING TEST. Next make an armature longitudinal damping test by switching twelve volts directly and momentarily on and off the complete motor teazer circuit, when it should be observed that there is no appreciable outward (engaging) or inward (disengaging) armature thump. If this is not the case, the correctness of the damper system should be investigated. | ||