Gearchange help controlling a BLDC motor
02 Oct 2019 18:45 #146887
by tacklem60
Replied by tacklem60 on topic Gearchange help controlling a BLDC motor
Do you happen to know how I could fix the issue where my speed seems to flatten out near 550 RPM?
Like I said, I'm assuming it's because I have 2 points near 1300RPM with very different actual speeds but I don't know how I would work around that.
Like I said, I'm assuming it's because I have 2 points near 1300RPM with very different actual speeds but I don't know how I would work around that.
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03 Oct 2019 05:11 #146950
by andypugh
Replied by andypugh on topic Gearchange help controlling a BLDC motor
Do you have any sort of input that tells the system which gear is engaged?
I think I would use two lincurves, one for each gear, then switch between their outputs using a mux2 operated by the gear switch.
I think I would use two lincurves, one for each gear, then switch between their outputs using a mux2 operated by the gear switch.
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03 Oct 2019 05:56 #146953
by tacklem60
Replied by tacklem60 on topic Gearchange help controlling a BLDC motor
I don't have any system to tell the control which belt speed it is in and didn't plan on adding one because I seldom use low range.
The way I hoped to do it was similar to a toolchange in Linux where there was maybe a pop-up if a speed below 1300RPM is requested and it waits until I click ok to continue. I know that is basically what Pathpilot does for Tormach and it is LinuxCNC based. I just don't know how they accomplish it
The way I hoped to do it was similar to a toolchange in Linux where there was maybe a pop-up if a speed below 1300RPM is requested and it waits until I click ok to continue. I know that is basically what Pathpilot does for Tormach and it is LinuxCNC based. I just don't know how they accomplish it
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03 Oct 2019 08:27 #146961
by pl7i92
Replied by pl7i92 on topic Gearchange help controlling a BLDC motor
you also need a parameter VAR at the startup loaded to tell the last known state
but it is as no feedback always a problem of the user
and it needs not to be that hard coded only the use of the mux shoudt give you a clear value
but it is as no feedback always a problem of the user
and it needs not to be that hard coded only the use of the mux shoudt give you a clear value
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04 Oct 2019 01:36 #147062
by andypugh
Replied by andypugh on topic Gearchange help controlling a BLDC motor
You can set up the message component to ask for a gear change.
Use wcomp to set a bit that is true for a range from (say) 5 rpm to 500, and then use the "over" to set a bit to ask for high gear.
linuxcnc.org/docs/2.7/html/man/man9/wcomp.9.html
linuxcnc.org/docs/2.7/html/man/man9/message.9.html
(It's probably worth having a quick scan through all the HAL components at: linuxcnc.org/docs/2.7/html/ ("Realtime components and kernel modules")
Use wcomp to set a bit that is true for a range from (say) 5 rpm to 500, and then use the "over" to set a bit to ask for high gear.
linuxcnc.org/docs/2.7/html/man/man9/wcomp.9.html
linuxcnc.org/docs/2.7/html/man/man9/message.9.html
(It's probably worth having a quick scan through all the HAL components at: linuxcnc.org/docs/2.7/html/ ("Realtime components and kernel modules")
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