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Shoulder Joint Motor MG 4315-8 – BLDC Servo with 8:1 Planetary Gearbox

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Categories	Shoulder Joint Motor
Brand	Solismotor Custom Robot Joint Drives
Model	MG 4315-8
Rated Torque	1.60N·m
Peak Torque	14.25 N·m
Gear Ratio	8:1 Planetary
Encoder	14-Bit, Dual Support
Communication	CAN Bus / RS485
Protection	IP54
Weight	~371.5g
Dimension	Ø57*58 mm

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Detail Information

MG4315-8 Integrated Robot Joint Motor

The product integrates a high-performance brushless motor, an 8:1 precision planetary gear reduction mechanism, high-precision dual encoders, and an intelligent drive control system. Within a compact structure, it achieves excellent torque density, fast dynamic response, and precise motion control. It supports position, velocity, torque, and hybrid control modes.

Ø57*58mm Ultra-Compact 1.60N.m Rated /14.25 N.m Peak Torque 8:1 Precision Planetary Gearbox IP54 Protection Rating 14-Bit High-Resolution Encoder

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Engineered for Precision Motion

Feature – Integrated All-in-One Design

The MG 4315-8 integrates a BLDC servo motor, 8:1 planetary gearbox, drive electronics, and dual encoders in a singleØ57*58mm housing. This eliminates the need for separate component sourcing, wiring, and tuning.

Advantage – Reduced System Complexity

By combining motor, gearbox, driver, and encoder into one module, engineers can cut development time by up to 60% and simplify overall system architecture significantly.

Benefit – Faster Time to Market

With plug-and-play integration, R&D teams can focus on application-level development rather than motor control, accelerating robot prototyping and production ramp-up.

Feature – High Torque Density

Rated output torque of 1.60 N·m with peak stall torque reaching14.25N·m. The 8：1 planetary gearbox delivers exceptional torque density in a compact form factor.

Advantage – Superior Dynamic Performance

High torque-to-weight ratio enables faster acceleration, smoother motion, and greater load capacity — critical for responsive robot joint movement.

Benefit – Handles Demanding Applications

Suitable for humanoid robots, collaborative robots, and exoskeletons where high torque and compact size are essential for natural, powerful motion.

Feature – Dual Encoder Feedback & IP54 Protection

Built-in 14-bit high-resolution encoder with support for secondary encoder feedback on the output shaft. IP54-rated sealed housing protects against dust and water splashes.

Advantage – Precision & Reliability

Dual-loop feedback ensures accurate position, speed, and torque control. IP54 enables deployment in harsh industrial environments without performance degradation.

Benefit – Long-Term Operational Stability

Reliable feedback and environmental protection reduce maintenance needs and ensure consistent performance over extended operating periods.

Technical Specifications

ParameterValue

ModelMG 4315-8

Winding MethodY (Star)

Voltage Range12 ~ 40 VDC

Rated Torque1.60 N·m

Peak Torque14.25N·m

Gear Ratio8:1 (Planetary)

Encoder Resolution14-Bit

CommunicationCAN Bus / RS485

Protection RatingIP54

Weight (with driver)~371.5g

Dimension (with driver)Ø57*58 mm

Noise< 60 dB

Working Temperature-20 ~ +80 °C

Dual Encoder SupportYes (Output Shaft)

Custom Brake SupportYes

Key Applications

Humanoid Robots

Joint actuation for bipedal and full-body humanoid platforms

Collaborative Robots

Safe, precise motion for cobot arms and grippers

Exoskeletons

Power assist and rehabilitation exoskeleton systems

Education & Research

Robotics labs, university projects, and prototyping

Medical Assistants

Surgical robots and rehabilitation equipment

Smart Automation

Automated guided vehicles and smart manufacturing

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