Marco Reps has an interesting look at Hobby Level motor controls: Blue Chinese Hybrid O-Drive (2 motor) Trinamic Stepper Motion Controls And a follow-up video: Professional Servo Drives LinuxCNC and MESA FPGA
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Dual Closed Loop Control with KFLOP
The Dynomotion KFLOP controller can control 8 motor axis (either as 4 dual/slaved or 8 independent), complete with 8 dedicated hardware encoder channels (while any generic input could be used in theory for encoding, I
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