7/30/2023 0 Comments Magnetic train railsstl files are aviable at the bottom of this step. The 3D-Printed parts are made out of PLA with a resolution of 0.1mm. You can download all the CAD-Files at the bottom of this step. The steel parts for the forcer are handmade, because my CNC machine has not the capability to mill steel. The most complex part to machine is the carriage fixture, because this part requiered a two side machining. Below you will find all requiered parts and files of the motor:Īll installed aluminium parts are milled on my diy CNC-Router. The complete motor is designed with Fusion 360. You will find more information about the coils in step 5. The installed coils have a dimension of 16x26mm and are made out of 0.2mm copper isolated wire. Just because of two sheets of iron, the magnetic flux between the two magnets will be increased. ![]() The conclusion is to use some iron sheets from the outside to mount the magnets. But if you will use a high permability material like Iron, the resistance for the magnetic flux will drop significantly. After some experiments with different kinds of coil fixtures and distances, I found out that the best distance between the magnets is 6mm (This is not the mathematical perfect distance, but for me it is the closest distance I could reach if you consider that I need to create the fixture and the coils by myself).Īs said above the resistance of the magnetic flux will be increased by low permability materials like air. On the other hand, there are still the coils between the magnets, which needs to be fixed in there position and also need to withstand the applied current. On the one hand the magnetic field between the magnets will be increased, by decreasing the distance between them. One of the main problems of a motor is the gab of air between the coils and magnets. The distance between the lower and upper magnets:.Because I have choosen to build an ironless type linear motor, that means that there is no iron or any other material with a high permability inside the coils, there are a few points you need to consider about, before start building your own motor: The coils needs to be arranged to the magnets like seen above, this kind of arrangement will cerate the optimal force to the three coils. The arrangement of the coils to the magnets: At frist it sounds simple "just three coils between some magnets", but after some tests, I could say it was really hard to find the right parameters: Sadly the infomations, which are necessary to build an Ironless Linear Motor aren't descriped that well in this article, so I have written down my own experiences, while building this motor. For a better imagination, please take a look at this Wikipedia article. The coils will create a periodic moving magnetic field, which will result in a force which will drive the motor. You controll the Linear-Motor like a rotary motor by connecting a three phase sinusiodle current at each of the coils. ![]() Theoretectly a Linear Motor is just an unrolled three phase Motor. # You can see this motor live at Maker Faire Ruhr 2019 # # If you like my Instructable, please vote for me in the Epilog-Contest 10# Travel-Speed: 200mm/s (at 24V, I think there is much more possible, but my coils are getting to hot above 24V)Īccuracy: 0.3mm (remember there is just a 400pulse/rev encoder)Ĭost: < 100€ if you have all the tools like CNC-Mill and 3D-Printer at home.įast movements position is set in the Arduino-File:įixed position the Motor tries to withstand external forces to keep his position: This project helped me a lot to understand, how a Linear-Motor works in general, and how to programm a closed-loop controller for it. However there are some points which need to be improved especially in the position regulation. After one month of research and improvements I can say, I have built my own working Ironless Linear-Servo-Motor. So I started to create CAD-Drawings and Electronics. Theoretecly a Linear-Servo-Motor is just a three phase sychronous motor with a closed loop position feedback. ![]() But after some research I thought it will be possible to build my own Linear-Motor. So buying a Linear-Motor is not an option anymore. Sadly these Motors are very expensive (>1000€ per piece). I thought it would be really cool, if I could addapt these kind of motor in a Laser or 3D-Printer Application. It was quite astonishing how fast these Motors can move with an incredible precision. When I visited one of the biggest trade faires for Automation here in Germany, I saw a lot of Linear-Motors in Industry Applications. Hi, in this Instructable I want to show you, how to build your own Linear-Servo-Motor for Linear-Movement-Applications.īut at first the story about this Instructable:
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