The DAMIAO J4340-2EC Brushless Servo Joint Motor is a compact high-torque actuator for robotic arms, industrial manipulators, mobile platforms, and research-grade motion-control systems. It combines a brushless motor, integrated MIT driver, gear reduction, and dual magnetic encoders for closed-loop joint control.

The verified J4340-2EC data lists 9Nm rated torque, 27Nm peak torque, 36rpm rated speed, a 40:1 reduction ratio, CAN communication at 1Mbps, and UART tuning at 921600bps. Shopify offers four selectable configurations: V3 / 24V, V3 / 48V, V4 / 24V, and V4 / 48V.

For the supplied DAMIAO driver-version mapping, V3 corresponds to DM-J4340-2EC and V4 corresponds to DM-J4340-2EC V1.1. Choose the voltage and driver generation that match the robot power system, controller setup, wiring, current limits, and integration plan.

Features

• 9Nm rated torque – Supports high-torque, low-speed robotic joint applications.
• 27Nm peak torque – Provides strong short-duration output within proper power, thermal, and mechanical limits.
• 40:1 reduction ratio – Designed for controlled joint motion where torque and low-speed precision matter.
• Dual magnetic encoders – Provides single-turn absolute output-shaft feedback for closed-loop control.
• Integrated MIT driver – Combines motor and driver electronics in a compact actuator unit.
• 24V and 48V selections – The 24V and 48V choices support different robot power-system designs.
• CAN communication – Reports speed, position, torque, and temperature over CAN at 1Mbps.
• UART tuning – Supports parameter tuning and firmware workflows at 921600bps.
• Multiple control modes – Source data lists MIT mode, speed mode, and position mode.
• Protection functions – Listed protections include over-temperature, voltage, current, communication-loss, and overload fault handling.

Specifications

Variant Options

Product Visuals

DAMIAO J4340-2EC actuator overview Side view and mounting detail Connector and cable detail

Reference Documents

• DaMiao Motor Communication Protocol
• Foxtech DM-J4340-2EC User Manual
• Foxtech DM-J4340-2EC STP 3D Model

Application

• Robotic joint actuation – Build controlled joints for robot arms, quadrupeds, humanoids, and motion test rigs.
• MIT control experiments – Evaluate torque, velocity, and position control strategies in robotics research.
• Industrial automation prototypes – Develop compact rotary actuator modules for multi-axis machines.
• Education and research – Teach CAN communication, encoder feedback, motor protection, and tuning workflows.
• Mobile robot platforms – Integrate geared actuators into AGVs, AMRs, or legged robot modules after mechanical validation.
• Custom mechatronics – Use in pan-tilt units, force-feedback devices, and compact motion-control mechanisms.

Packing List

FAQ

Does J4340-2EC have multiple Shopify variants?

Yes. Shopify lists V3 / 24V, V3 / 48V, V4 / 24V, and V4 / 48V variants. The table uses voltage as rows and driver generation as columns so every SKU is visible.

How are the V3 and V4 driver versions mapped?

For J4340-2EC, the supplied driver-version table maps V3 to DM-J4340-2EC and V4 to DM-J4340-2EC V1.1.

How should I choose between 24V and 48V?

Match the selected voltage to your robot power bus, wiring, controller setup, and safety limits. Do not select 48V for a system designed only for 24V operation.

What torque and speed are listed?

The listed values are 9Nm rated torque, 27Nm peak torque, and 36rpm rated speed. The maximum no-load speed is listed as 52rpm at 24V and 100rpm at 48V.

What communication interface does it use?

The listed control interface is CAN at 1Mbps, with UART tuning at 921600bps.

What control modes are listed?

The listed control modes are MIT mode, speed mode, and position mode.

What is included in the package?

The confirmed packing list includes the J4340-2EC motor with integrated driver, one XT30(2+2)-F Power and CAN cable, and one GH1.25 3-pin UART debug cable.

Is a USB-CAN adapter included?

No USB-CAN adapter is listed in the confirmed packing list.