Hardware recomendations?
- Todd Zuercher
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23 Jun 2012 12:22 #21219
by Todd Zuercher
Hardware recomendations? was created by Todd Zuercher
I picked up some cheep brushless servos off ebay.
their specs are:
Torque Constant (Kt) : 1.8 in-lbs/ amp
Voltage Constant (Ke) : 19.9 - 23.1 V/KRPM
Rated Voltage : 230 volts
Continuous Speed (no load) : 6000 rpm
Peak Torque : 18.5 in-lbs
Continuous Torque : 6.1 in-lbs
Inductance : 5.8 mH
Encoder count: 2,000 ppr
Encoder Voltage : 5 Vdc
Encoder current: 225 mA
I was thinking about using this drive:
www.a-m-c.com/download/datasheet/sx25a20.pdf
it is a sinusoidal drive that takes 2 analog inputs.
I found some cheep used ones.
What hardware would you recommend to run these?
their specs are:
Torque Constant (Kt) : 1.8 in-lbs/ amp
Voltage Constant (Ke) : 19.9 - 23.1 V/KRPM
Rated Voltage : 230 volts
Continuous Speed (no load) : 6000 rpm
Peak Torque : 18.5 in-lbs
Continuous Torque : 6.1 in-lbs
Inductance : 5.8 mH
Encoder count: 2,000 ppr
Encoder Voltage : 5 Vdc
Encoder current: 225 mA
I was thinking about using this drive:
www.a-m-c.com/download/datasheet/sx25a20.pdf
it is a sinusoidal drive that takes 2 analog inputs.
I found some cheep used ones.
What hardware would you recommend to run these?
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23 Jun 2012 13:26 #21222
by andypugh
Replied by andypugh on topic Re:Hardware recomendations?
Todd Zuercher wrote:
So, they are 10A 120V motors and that AMC drive looks like a decent fit.
How do you propose generating the 2 analogue voltages? They need to be synchronised to the rotor movement. I think that can be done in HAL with the bldc component and digital to analogue conversion (possibly PWM)
Do the motors have Hall sensors as well as the encoder?
That AMC drive appears to cost about $450, have you located a cheaper source?
Both the Pico (www.pico-systems.com/acservo.html) and mesa 8i20 (www.mesanet.com/motioncardinfo.html) are a fair bit cheaper, and are easier to integrate into LinuxCNC
The Pico drive expects Hall sensor feedback. If the motors don't have Hall sensors then there are inelegant ways to simulate them but that wouldn't be ideal.
Torque Constant (Kt) : 1.8 in-lbs/ amp
Voltage Constant (Ke) : 19.9 - 23.1 V/KRPM
Continuous Speed (no load) : 6000 rpm
Peak Torque : 18.5 in-lbs
I was thinking about using this drive:
www.a-m-c.com/download/datasheet/sx25a20.pdf
So, they are 10A 120V motors and that AMC drive looks like a decent fit.
How do you propose generating the 2 analogue voltages? They need to be synchronised to the rotor movement. I think that can be done in HAL with the bldc component and digital to analogue conversion (possibly PWM)
Do the motors have Hall sensors as well as the encoder?
That AMC drive appears to cost about $450, have you located a cheaper source?
Both the Pico (www.pico-systems.com/acservo.html) and mesa 8i20 (www.mesanet.com/motioncardinfo.html) are a fair bit cheaper, and are easier to integrate into LinuxCNC
The Pico drive expects Hall sensor feedback. If the motors don't have Hall sensors then there are inelegant ways to simulate them but that wouldn't be ideal.
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23 Jun 2012 18:18 #21231
by Todd Zuercher
Replied by Todd Zuercher on topic Re:Hardware recomendations?
I found some used ones for about 1/5 the new price.
My 2nd choice is probably the Mesa 8i20. But they cost more than twice the price of these used ones I found.
I was hoping that someone had tried one of these AMC drives, and that I could learn from their experiences.
The motors have a hall signal. I think it is another set of differential signals built into the encoder. They also have a temperature sensor (I need to learn more about it to see if I can make use of it.)
My 2nd choice is probably the Mesa 8i20. But they cost more than twice the price of these used ones I found.
I was hoping that someone had tried one of these AMC drives, and that I could learn from their experiences.
The motors have a hall signal. I think it is another set of differential signals built into the encoder. They also have a temperature sensor (I need to learn more about it to see if I can make use of it.)
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23 Jun 2012 18:24 #21232
by andypugh
Replied by andypugh on topic Re:Hardware recomendations?
What other hardware do you have? I am guessing more than a parport?
I think you would want some high-quality D to A to control that drive.
I think you would want some high-quality D to A to control that drive.
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- Todd Zuercher
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23 Jun 2012 19:18 #21234
by Todd Zuercher
Replied by Todd Zuercher on topic Re:Hardware recomendations?
I don't have anything yet. I'm making my shopping list. This is why I am asking for suggestions. I was thinking about some combination of Mesa hardware.
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24 Jun 2012 16:34 #21268
by andypugh
Replied by andypugh on topic Re:Hardware recomendations?
Todd Zuercher wrote:
The 5i25/7i77 combination might work. It has 6 analogue outputs, which could be used in pairs to control the AMC drives.
There should be enough IO to connect up the Hall sensors too.
I don't have anything yet. I'm making my shopping list. This is why I am asking for suggestions. I was thinking about some combination of Mesa hardware.
The 5i25/7i77 combination might work. It has 6 analogue outputs, which could be used in pairs to control the AMC drives.
There should be enough IO to connect up the Hall sensors too.
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