Why CubeMars Frameless Motors Are the Ideal Choice for Robot Joints

With the rapid development of humanoid robots, quadruped robots, industrial robots, and collaborative robots, robotic systems are placing increasingly high demands on joint actuation systems.

Robot joints not only need to provide sufficient output torque but must also simultaneously meet:

• Smaller installation space
• Lower system weight
• Higher position control accuracy
• Faster dynamic response
• Longer stable operation

Traditional housed motors, due to their fixed structure and relatively large size, are gradually struggling to meet the demands of next-generation robots for high-performance joint modules.

Therefore, frameless motors have become one of the key technologies in robot joint design.

CubeMars frameless motors, with their high torque density, flexible integration design, and reliable performance, provide an efficient power solution for robotic actuators, making them an ideal choice for humanoid robots, robotic arms, and other intelligent robotic joint systems.

 

What is a Frameless Motor?

 

1.Basic Structure of Frameless Motors

A frameless motor is a split-type motor consisting of:

• Stator
• Rotor

Unlike conventional motors, frameless motors eliminate:

• External motor housing
• Fixed bearing structures
• Some mechanical connecting components

This allows the motor to be installed directly inside the robot joint.

 

2.Differences Between Frameless Motors and Conventional Motors

 

For robot manufacturers, the frameless design means greater freedom for structural optimization.

 

Why Do Robot Joints Need Frameless Motors?

 

Robot joints are different from ordinary industrial equipment; they need to simultaneously meet requirements for power, precision, and response speed.

 

1.High Torque Output: Meeting Robot Motion Requirements

Robots need to perform tasks through their joints, including:

• Walking
• Grasping
• Balancing
• Load handling

For example:

Humanoid Robots

Leg joints need to bear the human body weight and perform actions such as walking and squatting.

Quadruped Robots

Leg joints need to handle:

• Jumping;
• Rapid movement;
• Terrain changes.

Industrial Robots

Robotic arms need to continuously output stable power to perform precise operations.

Therefore, robot joint motors must possess sufficient output torque.

 

2.High Torque Density: Achieving Lightweight Design

For robots, weight directly affects:

• Energy consumption;
• Movement speed;
• Battery life;
• Dynamic performance.

Robot developers aim to obtain greater power output within a limited space.

High torque density means:

• Smaller joint dimensions;
• Lighter robot structure;
• Higher motion efficiency.

This is a key advantage of frameless motors over conventional motors.

 

3.High-Precision Control: Enabling Natural Movement

Modern robots need not only to move but also to perform complex interactions.

For example:

• Robotic arms precisely grasping objects;
• Collaborative robots working safely;
• Humanoid robots maintaining dynamic balance.

Therefore, robot joints require:

• Precise position control;
• Stable torque output;
• Fast response capability.

Compared to traditional motion systems, robots rely more heavily on high-precision torque control.

 

4.Fast Dynamic Response: Adapting to Complex Motion Environments

During motion, robots need to continuously adjust joint outputs.

For example:

• Humanoid robots maintaining balance while walking;
• Quadruped robots adjusting gaits based on terrain;
• Robots quickly avoiding obstacles.

Frameless motors, due to their compact structure and low rotational inertia, can achieve:

• Faster start-up;
• Faster acceleration and deceleration;
• More responsive control.

This helps robots achieve more natural and fluid motion.

 

5.Long-Term Stable Operation

Robotic applications typically require long-term continuous operation.

Motors may face:

• Temperature rise;
• Vibration;
• Dust;
• Moisture.

Therefore, robot joint motors require high reliability.

 

Core Advantages of CubeMars Frameless Motors

 

1.High Power Density Design, Enhancing Robot Dynamic Performance

CubeMars frameless motors optimize:

• Electromagnetic structure design;
• Magnetic circuit layout;
• Stator and rotor structure;

to improve output capability per unit volume.

Compared to conventional motors, the frameless structure reduces non-essential mechanical components, allowing more space for power output.

Advantages include:

• Smaller size;
• Higher output;
• Lower weight.

This meets the robot's requirements for lightweight, high-performance joints.

 

2.Flexible Integration, Creating High-Performance Robot Actuators

Modern robot joints typically consist of multiple core components:

• Motor;
• Reducer;
• Encoder;
• Driver;
• Torque sensor.

CubeMars frameless motors eliminate the traditional housing limitation and can be directly embedded into the robot's internal structure.

This design enables:

 

Improved Space Utilization

Making robot joints more compact.

 

Simplified Mechanical Structure

Reducing additional mounting components.

 

Enhanced System Integration Efficiency

Helping developers quickly build robot actuators.

 

3.High-Precision Torque Control, Enabling Intelligent Robot Motion

CubeMars frameless motors, combined with high-precision feedback systems, can achieve:

Precise Position Control

Supporting:

• Precision assembly;
• Industrial operations;
• Robot motion planning.

Precise Torque Control

Meeting requirements for:

• Compliant control;
• Human-robot collaboration;
• Dynamic motion control.

Fast Feedback Response

Enhancing the robot's adaptability to environmental changes.

 

4.Potting Technology Enhances Robot Joint Reliability

CubeMars RI series frameless motors utilize potting technology to improve the internal structural stability of the motor.

Advantages of the potting design include:

Optimized Heat Dissipation

Enhancing heat transfer between windings and external structures, improving continuous operation capability.

Enhanced Environmental Protection

Improving:

• Dust resistance;
• Moisture resistance;
• Vibration resistance.

Extended Service Life

Improving the long-term operational stability of robot joints.

 

5.CubeMars RI Series: Frameless Torque Motors for Robotic Applications

The CubeMars RI Series is a frameless inner-rotor torque motor specifically designed for robotic power systems.

Its core features include:

 

High Torque Density

Meeting the spatial constraints of robot joints.

 

Frameless Structure Design

Facilitating integration into various robot actuator solutions.

 

High-Precision Torque Output

Supporting precise robot motion control.

 

Potted Winding Technology

Enhancing heat dissipation and reliability.

 

Optimized for Robotic Applications

Suitable for:

• Humanoid robots;
• Collaborative robots;
• Industrial robotic arms;
• Exoskeleton robots.

 

CubeMars RI Series: Frameless Torque Motor Solutions for Robotic Applications

 

The CubeMars RI Series is a frameless inner-rotor torque motor specifically designed for robotic power systems.

Addressing robot joint applications, the RI series solves issues such as:

• Limited space;
• Insufficient power;
• High control precision requirements;
• Insufficient long-term operational reliability.

CubeMars RI Series Core Features:

 

Suitable for:

• Humanoid robots;
• Collaborative robots;
• Industrial robotic arms;
• Exoskeleton robots.

 

CubeMars Frameless Motor Application Scenarios

 

1.Humanoid Robots

Humanoid robots require numerous joints to achieve:

• Walking;
• Balance;
• Arm movements.

Frameless motors help achieve:

• Lighter joint structures;
• Higher dynamic performance;
• Movement closer to human motion patterns.

 

2.Quadruped Robots

Quadruped robots rely on joints to perform:

• Body support;
• Jumping;
• Rapid movement.

Frameless motors provide:

• High instantaneous output;
• Fast response;
• Stable control.

 

3.Industrial Robots and Collaborative Robots

Industrial robots place greater emphasis on:

• Precision;
• Stability;
• Service life.

Frameless motors can support:

• High-frequency motion;
• Precise control;
• Long-term operation.

 

4.Exoskeleton Robots

Exoskeleton devices require:

• Miniaturization;
• Light weight;
• Strong power.

Frameless motors can reduce system weight and improve wearing comfort.

 

How to Choose a Robot Joint Motor?

 

When selecting a robot joint motor, the following key parameters should be considered:

 

CubeMars frameless motors are optimized for robotic application requirements in terms of power, control, and reliability, providing robot developers with more flexible solutions.

Summary

 

As robotic technology continues to advance towards high performance, high intelligence, and lightweight designs, robot joints, as the core components connecting power and motion, place increasingly high demands on motor systems. Future robots will need not only to perform simple repetitive tasks but also to possess human-like motion capabilities, including fast response, precise control, stable output, and adaptability to complex environments.

Under this development trend, conventional motor solutions, due to their fixed structure and limited space utilization, can no longer fully meet the needs of next-generation robot joints for high torque density, miniaturization, and high integration. Frameless motors, with their unique split stator-rotor structure, offer a more flexible and efficient solution for robot actuator design.

CubeMars frameless motors, through optimized electromagnetic structure design, achieve higher power output within limited space, effectively enhancing the torque density of robot joints, allowing robots to maintain strong motion capabilities while reducing weight. At the same time, the frameless design eliminates non-core structures such as conventional motor housings, providing robot manufacturers with greater design freedom to more flexibly integrate reducers, encoders, and drive systems, creating compact, high-performance integrated robot actuators.

Furthermore, CubeMars frameless motors are also optimized for robotic applications in terms of control precision and reliability. Combined with high-precision feedback systems and advanced control technologies, frameless motors can achieve more precise speed, position, and torque control, meeting the complex application needs of humanoid robot walking, precise robotic arm manipulation, and collaborative robot compliant control.

Addressing the issues of temperature rise, vibration, and environmental impact faced during long-term robot operation, the CubeMars RI series frameless motors utilize potting technology, which improves winding protection and heat dissipation performance, helping to enhance motor stability and service life under high-load, high-frequency working conditions.

From humanoid robots to quadruped robots, from industrial robotic arms to exoskeleton devices, robotic applications are continuously expanding, and high-performance joint actuators will become a crucial factor determining a robot's motion capabilities. With high torque density, compact structure, flexible integration, high-precision control, and reliable performance, CubeMars frameless motors can help developers break through the limitations of traditional power solutions, providing more efficient, precise, and reliable motion solutions for next-generation robots.

In the future, as the robotics industry continues to grow, frameless motors will play an increasingly important role in robotic joint systems. CubeMars will continue to drive the development of robot actuators towards lighter, stronger, and more intelligent directions through innovative motor technology, providing high-performance power cores for robot developers worldwide.