Waveshare DDSM115 Direct Drive Servo Motor

Overview

The Waveshare DDSM115 is an all-in-one direct drive servo motor that integrates a permanent magnet synchronous motor (PMSM), high-resolution encoder, and servo controller into a single compact unit. By eliminating the traditional mechanical reducer, it achieves near-lossless drive efficiency with minimal backlash.

Key Specifications

Parameter	Value
Rated Voltage	18V DC (5S LiPo)
Rated Current	1.25A
No-load Current	<=0.25A
Locked-rotor Current	<=2.7A
Rated Speed	115 RPM
No-load Speed	200 RPM
Rated Torque	0.96 Nm
Locked-rotor Torque	2.0 Nm
Encoder Resolution	4096 positions (12-bit)
Communication	RS485
Operating Modes	Current loop, Position loop, Velocity loop
Weight	765g
Operating Temperature	-20 to 45 C
Noise Level	<=50dB
Protection Rating	IP54

Features

• Direct drive — no gearbox, no backlash, high efficiency
• Integrated 4096-position absolute encoder for precise positioning
• RS485 bus communication — chain multiple motors on one bus
• Three control modes: current, position, and velocity loops
• Real-time feedback: position, speed, current, temperature, and error codes
• Built-in overcurrent protection and electric brake
• IP54 dust and water protection

Getting Started

Connect the motor to your controller via RS485. Use the provided protocol documentation to send commands for position, velocity, or current control. Multiple DDSM115 motors can be daisy-chained on a single RS485 bus with unique IDs.