#Closed-Loop (3)

Zetta ζ: Closed-Loop Recovery Harness on Frozen VLA Policies

@techniahqrobot · 281 views · 2026-08-30

Tongchuan TCM Series Closed-Loop Joint Module

TCM14B/17B closed-loop joint modules, DC48V, dual magnetic encoders with built-in brake, full closed-loop control, backlash <=10 arcsec, 90 arcsec positioning, 0.95/1.4 kg, ratios 11-40, for lightweight joints and exoskeletons.

COMPONENT

Joint modulesTongchuan PrecisionTCMClosed-Loop

Oriental Motor αSTEP AZ Series Closed-Loop Absolute Stepper Motors

The AZ Series is Oriental Motor's (Japan) αSTEP closed-loop stepper family with a built-in mechanical absolute encoder (ABZO) for battery-free absolute positioning without external sensors. Its hybrid control runs open-loop under normal load and switches to closed-loop correction on overload, combining stepper responsiveness with servo-level reliability, tuning-free and without stop-position hunting. Frames span NEMA 8 to NEMA 34 with holding torque up to 4 N·m standard and 110 N·m geared; brake, IP66 connector and geared variants are available, and matching drivers support EtherCAT, EtherNet/IP, PROFINET and Modbus.

COMPONENT

Stepper motorsClosed-LoopAbsolute Encodersstep-servo