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).
Test procedures for armature damping and longitudinal motion.
| Identifier | ExFiles\Box 62\1\ scan0185 | |
| Date | 24th October 1933 guessed | |
| -4- (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. (7) LONGITUDINAL MOTION TEST. The motor is to be arranged mechanically for the next tests so that engagement can take place with a wheel (speed ratio 15 2/3 : 1) representing the flywheel gear of 40/50 engine, connected to a brake drum for applying the necessary load. Clamp or load up the drum so that it will be unable to turn under the action of the teazer current in the motor. Now apply a voltage of 9.0 -.1 to the teazer terminal of the motor. Repeat this several times for each of several positions of the break wheel taken at random, allowing the armature to return fully to its normal position each time. Provided the pinion does not jam on the engaging corners, it must slide into mesh far enough for the armature operated contacts to close every time. | ||