Kirk Wallace wrote: >Speaking of Yaskawa, I have a Yaskawa SGMP-15U314MS motor which seems to >combine the commutation information within the position information. >There are three pair of wires, each with what appear to be an encoder >signal. To use this motor with my setup, I will either need to find a >way to decode the current signals or fit the motor with hall sensors. >Does anyone have experience with either? > > Yup. It is proprietary, but as far as I could dope out, the C channel has transitions at the same pitch as the A and B. I suspect the phase relationship between the C channel and the A and B gives the commutation info, so at any static position, the drive can determine what effectively replaces the Hall signals. The encoder in these is pretty odd, too. It appears to be magnetic, and quite sensitive, IE touching or wiping the encoder drum destroys it. (That was on a motor that had filled up with way oil. It wans't working right before I opened it, and after cleaning, the encoder gave no output whatsoever. I wiped the info off the drum!)
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