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Persistent "zero" shaft position

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(@terminalcity)
Posts: 9
Active Member Guest
Topic starter
 

I'm working on an application using an SM1720 with GH17P10.

The system needs to maintain a persistent zero postion: i.e. during the startup sequence, it has to find the same shaft angle.
This is an angular position, and it's ok if the motor turns one or more times to get that shaft angle.

Do I need an external sensor (hall effect, optical etc), or is this achievable in software?

thanks

Daniel

 
Posted : 08/11/2015 3:46 pm
(@csearcy)
Posts: 66
Trusted Member Guest
 

You can only find shaft angle within one revolution of the motor shaft. With the 10:1 gearhead, you will need some form of sensor to get you close.

 
Posted : 09/11/2015 12:50 pm
(@terminalcity)
Posts: 9
Active Member Guest
Topic starter
 

Thank you! I hooked up a hall sensor to the Left limit input, and now when I send "d=UDI Rd" I get back the index value!

Just what I needed, thanks.

D

 
Posted : 24/11/2015 11:05 pm
(@terminalcity)
Posts: 9
Active Member Guest
Topic starter
 

Thank you! Works like a charm:
- hooked up hall sensor to left limit input
- move motor while periodically sending "d=UDI Rd" returns the index (external hall sensor) sensor state.

 
Posted : 24/11/2015 11:09 pm
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