An extruder with a stepper motor is used in my Pusa I3 and also in almost all 3D printers.
I decided to develop a lighter extruder drive based on a 3-phase linear actuator with a magnetic Halbach array. It is designed to directly replace NEMA17 in any 3D printer.
I wanted to use VCA (Voice Coil Actuator) as a drive, but VCA are very expensive and weaker than the drive with 3-phase coils and a magnetic Halbach array.
Features of the extruder drive:
High Force to Weight Ratio
High continuous and peak forces
Weight 4.2oz (119 grams)
Halbach Array magnetic system
Scotch Yoke mechanism.
For a full description of the drive, see here:
We need 5 Neodymium Rare Earth magnets 5X5X25mm N42 magnets
or use compound magnets, they will need 10 pieces.
The diameter of the wire can be changed if a larger force is required, but the consumption current will increase.
Tests with a 3-phase bridge driver showed that the drive effort is sufficient to operate as an extruder drive.
This is an experimental device, work on it continues.
Hi! All my models were created in the program Autodesk 123D Design and Fusion 360.