| Electronics > Beginners |
| Odd two-phase induction motor in aerospace gyroscope, need help understanding |
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| Haatveit:
--- Quote from: SeanB on June 24, 2018, 05:50:23 am ---Gyro drive will be 400Hz 3 phase, either 115VAC or 26VAC, as the precise speed of the gyro is not too critical, as it runs in a vacuum the slip will in any case be nearly zero after run up. The split phase motor and clutch driving a gear train will be for alignment of the gyro axis, as it will allow the cage to be rotated to a new fixed position even with the gyro running, allowing you to set the initial pointing direction of the whole unit after power up. From the looks of the wires your unit uses 115VAC for the gyro power, but the rest use 26VAC for all the resolvers and such. The enamelled copper windings are too thick for 115VAC, and most resolvers are 26VAC anyway, along with the synchro displays, and in any case almost all the synchro to digital converter blocks ( mostly you will find them marked Teledyne and potted in a block with a big blue top label giving pin out on there) accept 26VAC directly along with a reference 26VAC clock input. --- End quote --- Thanks, very useful! Although I doubt I'll find anything marked Teledyne in this 70's Soviet era (design) gyroscope (; I've found that they liked to do things their own way, with little or no interest in how things were done in other areas of the world at the time, which is one of the things that make these old beasts so interesting. Although obviously a lot of things end up being very similar since, usually, there are only a limited number of ways to successfully achieve what you want. |
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