Mitsubishi servo hacking - driving an IM spidle

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21 Dec 2021 05:07 #229607 by dm17ry
just for fun... a Mitsubishi MR-J3-70B servo amp hacked into MDS-D-SPJ3-075 driving a generic chinese induction motor spindle fitted with a home-brewed magnetic encoder at 32000 rpm under LinuxCNC control.... in position control mode, unified axis/spindle...
The following user(s) said Thank You: tommylight, Aciera

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21 Dec 2021 22:06 #229667 by andypugh
The following user(s) said Thank You: dm17ry

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23 Dec 2021 00:20 #229782 by dm17ry
indeed! kinda thrilled doing that oem-unapproved stuff :)
was surprised the TLE5012B is making it to that speed. the datasheet says "10krpm max, mechanical" whatever it means. probably they just haven't tested it above that.
officially supported spindle motor encoders for the MDS-D-SPJ3 with IM motors are 21bit minimum, so i was also concerned if 15bit will be enough. probably not good for using as a lathe C-axis, but i guess it should do as a mill spindle with orientation and/or rigid tapping for small threads.
the fastest original spindle motor is the 20krpm SJ-VL11-05FZT-S01, so i was pretty sure the amp should go to at least 24k... and 32krpm limit is really just parameters being checked as signed 16-bit values...

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