iHSV42-40-05-24 Servo motors
iHSV42-40-05-24 Servo motors
does anyone knows how ti connect this type of servo motor to a Duet 3 board
What is the advantage of a servo based system over closed loop steppers?
Without a manual, it's impossible to tell how to hook it up.
@BlueKTX I used them with the Duet 2 board. I used the expansion board to get the step/direction/enable signals for the motors. The expansion board drives the motors directly, without any level shifters or other screwing around.
@fcwilt The advantage of servos over steppers is much higher torque especially at high speeds, and much smoother, quieter operation. Whether you need extra high speed and acceleration are up to you. Steppers usually go fast enough for 3D printing, but plotters and pick and place machines can go much faster.
I used the 78W version of those motors in my sand table and it easily drives the very high friction corexy mechanism up to 2000 mm/sec with acceleration as high as 15000 mm/sec^2 (yes, about 1.5G). It could go much faster if I used larger drive pulleys and beefier power supplies. Servos will suck as much current as required to keep up with the input signal, so you need beefy power supplies to really make them fly. I used a 150W and 200W power supplies to power the motors in the sand table.
I swapped the servos into my 3D printer and ran some tests and the results weren't good (salmon skin all over the print indicating insufficient resolution), but someone else here used them with 3:1 reduction and got great results in a 3D printer. There are about a million parameters to tweak in the drivers, but little information to guide the tweaking, so it might be possible to improve the resolution without resorting to gear/pulley reduction, but I don't know how to do it. The spec says they have a 1000 line encoder, but it's hall effect type which isn't the same as a 1000 line optical encoder that probably would provide sufficient resolution.
Thanks for the information on the performance of servos.
I watched the video on the sand table but I was unable to discern the purpose of the device.
Does it produce something useful or is it for entertainment?
@fcwilt At this point it's just for entertainment. I'm exploring the possibility of preserving the patterns by using a "sand" like plaster or cement and then misting the finished pattern with water or cyanoacrylate and letting it set. The resulting "tile" could be used to add texture to walls, floors, etc.
Like many others, my sand table started with steppers, but I wanted higher speed. As I cranked up the speed, the steppers made more and more noise, so I tried the servos which exceeded all expectations for speed and noise level. As far as I can tell, I was the first to apply servomotors to a sand table build. If you look around the web at other sand table videos, everyone else's time lapse videos look about like my real time videos. Most people run the tables at 30-50 mm/sec in order to minimize stepper noise (you also get a bit more detailed patterns when the ball isn't throwing the sand as it moves!). My table can routinely run at 40x that speed without the motors even getting warm. At 500 mm/sec my table is about as quiet as a stepper driven table running at 50 mm/sec.