Engineer [Caden Kraft] developed a budget quasi-direct-drive motor inspired by MIT's Mini Cheetah, which is low-cost compared to commercial alternatives of similar performance.
The motor features a 3D-printed Halbach array for the magnets, a planetary gearbox with cycloidal gear profiles, hand-wound stator, and a cheap embedded motor controller.
[Caden] tested the actuator and achieved 29.4 Nm of torque, almost three times his initial goal, while costing less than $80 to build.
Despite drawing 50 A during testing, the actuator did not suffer damage, showcasing its robust design and exceeding performance expectations.