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 is 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)
- High Accelerations
- 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.