The DDSM315 is a direct drive servo motor from Waveshare that combines a brushless outer rotor motor (PMSM), encoder, and servo driver into a single compact unit. By eliminating a traditional gearbox reducer, it achieves zero-backlash positioning with ultra-low noise (≤50 dB), making it well suited for robotics and RC vehicle applications.

The motor communicates via RS485 bus, allowing multiple units to be coordinated on a single communication line. It supports current loop, position loop, and velocity loop operating modes, and includes Hall position detection and over-current protection.

Key Features

• Direct Drive (No Gearbox) – Zero backlash, high precision, reduced mechanical complexity
• All-in-One Design – PMSM motor, 12-bit encoder, and servo driver integrated
• Ultra-Low Noise – ≤50 dB during operation
• RS485 Bus Communication – Daisy-chain multiple motors on one bus
• Three Operating Modes – Current loop, position loop, and velocity loop
• IP54 Rated – Dust and splash-water protection
• Over-Current Protection – With Hall position detection

Specifications

• Rated Voltage – 18 V DC (compatible with 5S LiPo)
• Speed Constant – 17.5 RPM/V
• No-Load Speed – 315 ±10 RPM
• Rated Speed – 200 RPM
• Rated Torque – 0.55 N·m
• Stall Torque – 1.1 N·m
• Encoder Resolution – 12-bit
• Communication – RS485 bus
• Protection Rating – IP54
• Operating Temperature – −20°C to 45°C

Ideal For

• RC car and vehicle builds
• Home and commercial robotics
• UGV robot chassis
• Multi-motor coordinated systems

Package Contents

• 1× DDSM315 direct drive servo motor

Resources

• Waveshare Wiki — DDSM315