| Electronics > Beginners |
| Odd two-phase induction motor in aerospace gyroscope, need help understanding |
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| tpowell1830:
Could these motors be synchronous motors? They are used when you need very precise rotational speed. Unlike regular induction motors with torque established due to slip, these motors turn exactly at the input frequency as a function of given poles. Perhaps someone who reads Cyrillic could read the comments in the video and get a clue. Hope this helps... |
| Haatveit:
--- Quote from: tpowell1830 on June 22, 2018, 09:26:42 pm ---Could these motors be synchronous motors? They are used when you need very precise rotational speed. Unlike regular induction motors with torque established due to slip, these motors turn exactly at the input frequency as a function of given poles. Perhaps someone who reads Cyrillic could read the comments in the video and get a clue. Hope this helps... --- End quote --- You could very well be right. I managed to trace out the motor winding wires and they actually break out at the big huge military style connector on the housing of this unit, so either they wanted to drive them directly (these synchro-looking-ones), or they did some kind of sensing. Precise rotational speed sounds a lot like something you would want in a device like this. |
| amyk:
The large "motors" are actually positional sensors: https://en.wikipedia.org/wiki/Resolver_(electrical) |
| Haatveit:
--- Quote from: amyk on June 23, 2018, 03:00:57 am ---The large "motors" are actually positional sensors: https://en.wikipedia.org/wiki/Resolver_(electrical) --- End quote --- Now I feel stupid. :-DD You are right! And it makes a lot more sense, one for vertical, one for horizontal.. I guess for some reason I thought they were for adjustment or pointing of the gyro cage. |
| SeanB:
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. |
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