SPACE Racer V1R2

Validated

A 1 kW-class BLDC FOC driver: TI DRV8353 gate driver, three low-side shunts, MT6701 encoder input, halls, four LM75ADP thermal zones.

Where it stands

  • Dyno campaign done: 1049.5 W bus at 483 rpm, 78 % system efficiency, three commutation modes on one board. Full numbers are in the PRD baseline.
  • Production app atos-drive implements the ATOS motor API v2. Both chair drive boards run it as of 2026-10-15. It has not yet run with two boards under load.
  • Console and firmware update work over Ethernet since 2026-10-15, so a board inside a wheel no longer needs USB.

What SPACE changes for it

  • The W5500 breakout is the weakest part of the network story (H-07). Under ADR-0010, V2 picks between an SPI 10BASE-T1S MAC-PHY (keeps the ESP32-S3) and ESP32-P4 + RMII + a 100BASE-T1 PHY.
  • Under ADR-0003, drive nodes get a point-to-point link even though their traffic fits on 10 Mb/s.
  • Under ADR-0004, logic power separates from the 48 V input, which fixes the DRV8353 latch-needs-VM-cycle problem (H-11) at the system level.