I think this is quite interesting as it removes the need of VFD's and 220V.. Can we have more details on this subject. like what motors used and how much weight it would be able to hold? And do we still need the gearbox , if still needed, what gearbox?!.. Couldn't see it quite clearly on the vid.. Don't know what the min NM is to lift 150-200 KG.. Looking at video it would have enough speed for a race simulator platform..
Importing these motors to the Netherlands would probably cost me almost the same as getting motors, gearboxes and VFD here. And probably it would be easier to set up..
So all in all .. great job and looking forward to any additional information.. Perhaps this would be my route.. Seems all very compact there or perhaps we only have half the picture :-)
These servomotors work by sending pulses that indicate the relative position, and tracking the actual position internally in the AM1280USB. I don't need to be precise on the width of the pulses or their duration. I can have the pulses interrupted and resume if I need to so I don't block the operation of the AMC1280USB. For the AMC1280USB to generate all the pulses needed the timing can be from 100uS (short distances) to 1.5mS (full CW position to full CCW position). I only control the position, but by toggling the enable port once I can set alternative slow speed for the offline mode so the motors can park slowly.
As you can see on the video, the motors do use a gearbox. The gearboxes that are being used are 30:1. So I have to count in the pulses the gearbox as well, so I multiply the range of pulses to cover multiple rotations of the motor to get close to the 180 degrees rotation. There are enough pulses to cover many rotations at the time. The internal pulse buffer of the servomotor can handle up to 51000 pulses per revolution of the motor. I use only 800 pulses per revolution.
There is no drifting at all as the servo motors have internal counter to measure the actual position and maintain the position even if you force it out of position (it will return to its target!). Also it features a homing function that is activated every time you enable the motor (I enable the motor once during power up).
There is no PID on the AMC1280USB for these motors... I just calculate and send positions, and their internal PID does the job. Only downside, you need to do changes to their internal PID settings you need to do it manually 6 times with the USB cable they supply... They feature auto-calibration and adjustable max RPM speed and acceleration, as well adjustable torque limits. The motors will also re-generate power that is placed back to the capacitors of the power supply during their downward motion (driven by the load) so the can store extra power for reuse later. Really efficient motors!!
The TWO HUGE power supplies an be seen placed on the front of the platform in the video...
Depending on the servomotor, other servomotor and servo drives may be compatible or not with the control method I mention above. In many cases you can still use most of these servomotors with velocity control and close the loop to the AMC1280USB using external position sensors.
dureiken: Hi there, it's really quiet here someone could help me for my 6 dof project ? thanks a lot
Aug 8, 2017 15:34:46 GMT
tronicgr: dureiken Hi, Open a thread and I'll try my best to help. A little busy with Kickstarter details at the moment but I'll see what I can do.
Aug 12, 2017 11:57:42 GMT
dureiken74: I just did it
Aug 27, 2017 11:59:06 GMT
fimmy: How's the firmware going?
Sept 6, 2017 8:34:43 GMT
tronicgr: @fimmy I had to put it on hold to finalize the manufacturing of the new kickstarter controllers. I tested parts of it to ensure compliance with the new features and looks good so far. I'll get back to it soon for integration.
Sept 9, 2017 12:52:35 GMT
Theuns: Very nice design.I'm also busy with mine and changing it also to Linear Actuators with 220v Servo motors.I'm waiting for my new controllers from Thanos. If I may ask Do you have any Sketchup files of your design and willing to share it I Thanks Theuns
Sept 14, 2017 22:45:09 GMT
atayeu: Hey everyone! I'm reading up and gathering all of the intel I can find for my first motion platform. this is by far best information for creating one.
Oct 14, 2017 7:25:57 GMT
tmcnam: I must be crazy but I still can't find the blueprints to the platform by GA-Dawg. Any help would be appreciated. Thanks guys.
Mar 10, 2019 21:31:57 GMT
Trip Rodriguez: Sorry tmcnam, the shoutbox doesn't get much attention. Did you find the blueprints? They are at the VERY bottom of the extremely long first post. It says "attachments: 6DOF.zip
May 4, 2019 19:13:25 GMT
zivby: How much weight this setup can carry?
May 19, 2019 11:57:16 GMT
jeanmarcfr69: Thanos je suis francais et j'ai besoins de compléments d'information pour finaliser une installation avec 1 x AMC1280USB DELUX avec extension 3x servo motor DORNA. POurriez vous m'aider ?
Apr 12, 2021 6:58:17 GMT