servo drive
- vre
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22 Jan 2019 23:43 #124638
by vre
servo drive was created by vre
What options exist for driving ac servos > 3kw with resolvers from linuxcnc?
I mean ac servo drives that accept ste-dir or analog +-10v and read resolvers > 3kw power
I mean ac servo drives that accept ste-dir or analog +-10v and read resolvers > 3kw power
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- jmelson
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23 Jan 2019 02:41 #124645
by jmelson
Replied by jmelson on topic servo drive
Well, Pico Systems (that's me) makes converters that make a resolver produce standard quadrature encoder signals, so that could be used with a standard drive that doesn't accept resolvers.
See pico-systems.com/resolver.html for technical details, and
pico-systems.com/osc2.5/catalog/product_...ath=5&products_id=31
for catalog info.
Jon
See pico-systems.com/resolver.html for technical details, and
pico-systems.com/osc2.5/catalog/product_...ath=5&products_id=31
for catalog info.
Jon
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- vre
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23 Jan 2019 19:59 #124680
by vre
Replied by vre on topic servo drive
I have seen that but i want
also the power stage of driver not only to read the resolver.
What options for > 3kw exist for motors with encoders?
also the power stage of driver not only to read the resolver.
What options for > 3kw exist for motors with encoders?
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- Todd Zuercher
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23 Jan 2019 21:03 #124683
by Todd Zuercher
Replied by Todd Zuercher on topic servo drive
AMC has resolver capable drives big enough.
www.a-m-c.com/products/?page=product&cid...s&id=DPRANIR-030A800.
Other manufacturers have them as well. (A servo drive that big isn't going to be cheap though.)
www.a-m-c.com/products/?page=product&cid...s&id=DPRANIR-030A800.
Other manufacturers have them as well. (A servo drive that big isn't going to be cheap though.)
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- andypugh
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24 Jan 2019 01:04 - 24 Jan 2019 01:05 #124699
by andypugh
3kW is pretty big. STMBL, Mesa, Pico and Granite drives all top out at <= 2.2kW.
If you are not in a hurry then the next generation of STMBL might have a power stage that can be substituted by bigger components.
(STMBL does natively support resolvers)
Pico converters or the Mesa 7i49 can read the resolvers. That opens up the possibility of commutating in LinuxCNC and driving non-resolver drives. (the bldc component can emulate a fairly good range of commutation signals).
If you get lucky, or have a lot of money, I am pretty sure that the Control Techniques Unidrive can use resolvers.
Replied by andypugh on topic servo drive
What options exist for driving ac servos > 3kw with resolvers from linuxcnc?
I mean ac servo drives that accept ste-dir or analog +-10v and read resolvers > 3kw power
3kW is pretty big. STMBL, Mesa, Pico and Granite drives all top out at <= 2.2kW.
If you are not in a hurry then the next generation of STMBL might have a power stage that can be substituted by bigger components.
(STMBL does natively support resolvers)
Pico converters or the Mesa 7i49 can read the resolvers. That opens up the possibility of commutating in LinuxCNC and driving non-resolver drives. (the bldc component can emulate a fairly good range of commutation signals).
If you get lucky, or have a lot of money, I am pretty sure that the Control Techniques Unidrive can use resolvers.
Last edit: 24 Jan 2019 01:05 by andypugh.
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- vre
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24 Jan 2019 13:46 #124737
by vre
Replied by vre on topic servo drive
The reason iam asking is that i found a cheap robot
that has about 4kw servos but original drives are missing.
Also i have a lot of allen bradley inverters powerflex 40 4kw
Can i do something with these inverters?
that has about 4kw servos but original drives are missing.
Also i have a lot of allen bradley inverters powerflex 40 4kw
Can i do something with these inverters?
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- andypugh
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24 Jan 2019 14:01 #124741
by andypugh
From a quick scan of the manual, I would say not.
What is the voltage and current rating of the motors? This Youtube video claims 290V 20A
Which is a lot more than the normal STMBL rating. I don't know if he used a different power stage in the STMBL.
Are all the motors equally big? Typically they get smaller towards the effector end.
Replied by andypugh on topic servo drive
Also i have a lot of allen bradley inverters powerflex 40 4kw
Can i do something with these inverters?
From a quick scan of the manual, I would say not.
What is the voltage and current rating of the motors? This Youtube video claims 290V 20A
Which is a lot more than the normal STMBL rating. I don't know if he used a different power stage in the STMBL.
Are all the motors equally big? Typically they get smaller towards the effector end.
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- vre
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24 Jan 2019 22:32 - 24 Jan 2019 22:34 #124770
by vre
Replied by vre on topic servo drive
156v 9.5A are the servos some are more than 4kw i think 4.9kw & 5.9kw.
robots have big servos because arms need a lot of torque.
Another robot i found has 2.8kw servos 600v 5.4A
robots have big servos because arms need a lot of torque.
Another robot i found has 2.8kw servos 600v 5.4A
Last edit: 24 Jan 2019 22:34 by vre.
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- andypugh
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24 Jan 2019 23:04 #124772
by andypugh
Replied by andypugh on topic servo drive
Odd how the VA and kW figures can be so different.
I think it is worth asking on the STMBL Gitter. They have been used for quote a few robots now, and they accept resolver feedback and link to LinuxCNC as a Mesa smart-serial device. All very convenient.
I think it is worth asking on the STMBL Gitter. They have been used for quote a few robots now, and they accept resolver feedback and link to LinuxCNC as a Mesa smart-serial device. All very convenient.
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- islander261
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25 Jan 2019 01:38 #124781
by islander261
Replied by islander261 on topic servo drive
Even assuming a truly dismal power factor ( maybe not even legal to use in EU these days) this is a bit hard to swallow. Post a photo of the servo motors data plate. And watch you electricity meter spin when the arm is working!
John
John
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