DDSM315 Direct Drive Servo Motor

The DDSM315 is a direct‑drive servo motor built as a single integrated unit, combining an outer‑rotor brushless Permanent Magnet Synchronous Motor (PMSM), a 12‑bit encoder, and a high‑performance servo drive. It’s compact, easy to mount, and runs steadily, making it a reliable choice for small AGVs, balance vehicles, and robotics platforms. With an IP54 protection rating, it is also shielded against dust and water splashes for better durability in real-world environments.

It can spin up to 315±10 RPM with no load, or settle into a rated 200 RPM with 0.55 Nm of torque. The motor utilizes Field Oriented Control (FOC) and supports three distinct operating modes: Velocity, Position, and Current (Torque) loops. This versatility allows you to switch between precise speed maintenance, exact angular positioning, or specific force application depending on your project needs.

The driver includes on‑board diagnostics and provides real-time telemetry back to your controller, including temperature, position, velocity, and current feedback. It is also designed to support suspension installation, making it easier to integrate into advanced chassis designs. To jumpstart your development, there is an open‑source four‑wheel‑drive off‑road vehicle model available for this motor.

These motors feature two connectors: one for power (2-pin XH2.54) and one for RS485 data communication (4-pin ZH1.5). We also stock the Waveshare DDSM Hub Motor Driver Board, perfectly matched to drive these servo motors.

We also stock the DDSM115, DDSM210 and DDSM400 versions.

Features

• Integrated All-In-One Design – Combines a PMSM outer‑rotor motor, 12-bit encoder, and FOC driver in one unit
• IP54 Protection – Ingress protection against dust and water jets for a longer service life
• Multiple Operating Modes – Supports Current, Position, and Velocity loop control
• Suspension Compatible – Optimised for mounting with suspension-style UGV chassis
• No‑load speed: 315±10 RPM – High‑speed capability for rapid‑response projects
• Rated performance: 200 RPM with 0.55 Nm torque – Balanced for high-speed, reliable load handling
• Comprehensive Telemetry – Provides feedback on motor temperature, position, speed, and current over RS485
• Ultra‑low noise – Operates at ≤50dB thanks to the direct-drive, gearless architecture
• High precision and zero‑backlash – Direct drive eliminates mechanical play and increases efficiency to ~99.99%
• On‑board Protection – Includes over‑current protection, Hall position detection, and electric braking
• Open‑source Support – Downloadable 4WD off-road vehicle models and engineering files available

Specifications

Note: The parameters below were measured at the rated voltage of 18V DC.

Rated voltage	18 V DC
Operating voltage	12–24 V DC
Rated speed	200 rpm
No‑load speed	315±10 rpm
Rated current	1.45 A
No‑load current	≤0.3 A
Stall current	3.5 A
Ambient temperature	-20 to 45 °C
Rated torque	0.55 Nm
Stall torque	1.1 Nm
Torque constant	0.37 Nm/A
Encoder resolution	12-bit (4096)
IP Rating	IP54
Total weight	349±5 g
Single wheel load	10 kg
Speed constant	17.5 rpm/V
Noise level	≤50 dB

Resources

• Product Wiki
• Open-source chassis files

Package Contents

• 1x DDSM315 Direct Drive Servo Motor