A-A-52551 Starter-Generator: 300 Ampere, 28 Volts, Direct CurrentThis CID covers the requirements for a 300 ampere (A), 28 volt (V), direct current (dc) starter-generator, referred to herein as "generator". This dual purpose unit is belt driven with open construction and not submersible. The generator is used on military motor vehicles and on other equipment to start the gasoline engine connected to it and to generate dc energy for lighting, battery charging, and other purposes.

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A-A-52551A

NOTES:

1. Minimum peak value (P) shall be 40 gravity units.

2. Nominal pulse duration (D) shall be 18 milliseconds.

3. The oscillogram shall include a time about 3D long with a pulse located approximately in the center. The peak acceleration magnitude of the sawtooth pulse is P and its duration is D. The measured acceleration pulse shall be contained between the broken line boundaries and the measured velocity change (which may be obtained by integration of the acceleration pulse) shall be within the limits of Vi ± 0.1 Vi, where Vi is the velocity change associated with the ideal pulse which equals 0.5 DP. The integration to determine velocity change shall extend from 0.4D before the pulse to 0.1D after the pulse.

FIGURE 2. Sawtooth shock pulse configuration- Continued.

2.3.7 Vibration. Generator shall evidence no breakage, loosening of parts, abrasion, or other physical damage when subjected to a vibration for 2.5 hours along each axis. The vibration frequency shall be varied logarithmically from 5 Hz to 500 Hz and back to 5 Hz in 15 minutes and the vibration amplitude shall be in accordance with figure 3. Generator shall also withstand a vibration at the most severe resonant frequency along each axis for 30 minutes.

FIGURE 3. Vibration curve.