7I77 with 7I96
- Doug Crews
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20 Nov 2019 01:40 #150709
by Doug Crews
7I77 with 7I96 was created by Doug Crews
Hello, I have some nema 34 servo motors & drives on hand. They are dated but still literally new in condition. I have been planning on using a 5I25 and a 7I77 (analog) for control.
I also have some small brushed DC gear motors that have 100 pulse encoders, I want to play around with them too hopefully on the same system. I haven’t been able to easily source some small inexpensive analog amps/drives so I was planning on using the 7I96 Ethernet step and direction off the host PC to Geko 320 drives.
So, step & direction and analog off the same system? Go? No GO?
I also have some small brushed DC gear motors that have 100 pulse encoders, I want to play around with them too hopefully on the same system. I haven’t been able to easily source some small inexpensive analog amps/drives so I was planning on using the 7I96 Ethernet step and direction off the host PC to Geko 320 drives.
So, step & direction and analog off the same system? Go? No GO?
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- tommylight
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20 Nov 2019 02:33 #150714
by tommylight
Replied by tommylight on topic 7I77 with 7I96
forum.linuxcnc.org/show-your-stuff/31742...2-euros-for-2-motors
You can use something like that for the small motors, or some arduino 43 amp or 22 amp ones.
You can use something like that for the small motors, or some arduino 43 amp or 22 amp ones.
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- PCW
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20 Nov 2019 04:38 #150718
by PCW
Replied by PCW on topic 7I77 with 7I96
Yes I would agree, if you are just driving small low voltage motors with encoder feedback,
use a simple PWM driven H bridge (If you have a 7I96 it can be programmed to generate
PWM on the step/dir pins or the expansion port pins)
use a simple PWM driven H bridge (If you have a 7I96 it can be programmed to generate
PWM on the step/dir pins or the expansion port pins)
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- rodw
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25 Nov 2019 10:19 #151203
by rodw
Replied by rodw on topic 7I77 with 7I96
Just a heads up the Geckos are not a good choice. There is a thread by thefabricator03 where PCW tried to help him but in the end he gave up on them and returned them for a refund.
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- Doug Crews
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25 Nov 2019 19:14 #151243
by Doug Crews
Replied by Doug Crews on topic 7I77 with 7I96
Thanks all you guys for weighing in on this and nudging me into looking at h-bridges. For a while now I've been wondering why the RC model guys have been calling brushed & brushless DC motors "step motors" I thought they were confused. In my world Step motors were literally steppers. But I can see now how the h-bridge works and how it is sent step & direction. I guess that system with a brushed DC motor can be called a step motor too. I don't know when this became a thing, somehow I missed the memo though.
The 5I25 arrived yesterday. I'll be bringing together the rest of the system later this week, as time allows
The 5I25 arrived yesterday. I'll be bringing together the rest of the system later this week, as time allows
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- tommylight
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25 Nov 2019 23:25 #151259
by tommylight
Technically, two DC brushed drives make a single 2 phase stepper drive.
Replied by tommylight on topic 7I77 with 7I96
I blame the "arduino" bunch for that!Thanks all you guys for weighing in on this and nudging me into looking at h-bridges. For a while now I've been wondering why the RC model guys have been calling brushed & brushless DC motors "step motors" I thought they were confused. In my world Step motors were literally steppers. But I can see now how the h-bridge works and how it is sent step & direction. I guess that system with a brushed DC motor can be called a step motor too. I don't know when this became a thing, somehow I missed the memo though.
The 5I25 arrived yesterday. I'll be bringing together the rest of the system later this week, as time allows
Technically, two DC brushed drives make a single 2 phase stepper drive.
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