How to Choose Motors for a Mars Rover? Why Are More and More Robotics Projects Choosing CubeMars Drive Solutions

Mars Rovers are a type of mobile robot that places extremely high demands on the drive system.

Compared with ordinary wheeled robots, Mars Rovers need to operate in more complex environments, such as:

• Soft sandy terrain

• Gravel roads

• Irregular obstacles

• Long-distance travel

• High-slope terrain

These environments place higher demands on the drive system.

An excellent Mars Rover drive solution not only needs to provide sufficient output torque, but also needs to take into account:

• High torque density

• Compact structure

• Precise motion control

• High reliability

• Long-term stable operation capability

Therefore, during the motor selection process for a Mars Rover, engineering teams typically do not focus on a single parameter, such as maximum torque or maximum speed, but need to comprehensively evaluate whether the entire drive system can meet the motion requirements in complex environments.

In recent years, more and more robotics projects have begun adopting highly integrated robotic actuators and high-performance brushless motor solutions, among which CubeMars motor solutions have already been applied to Mars Rovers, mobile robots, and other robotic platforms, providing power support for complex motion systems.

Why Do Mars Rovers Need Special Drive Motors?

Mars Rovers typically adopt multi-wheel drive structures, such as four-wheel, six-wheel, or even more wheel configurations.

During actual operation, the vehicle needs to deal with:

• Changes in ground resistance

• Increased climbing load

• Impact from obstacles

• Risk of wheel slippage

• Space and weight limitations

Therefore, Mars Rover drive motors cannot simply pursue high-speed performance, but need to focus on the following aspects.

1. High Output Torque: Ensuring Traversability on Complex Terrain

Mars Rovers need to rely on their wheels to generate sufficient driving force to overcome:

• Their own weight

• Ground friction

• Slope resistance

• Obstacle resistance

Wheel-end output torque is usually affected by the following factors:

Output Torque = Motor Torque × Reduction Ratio × Transmission Efficiency

Therefore, increasing output torque within a limited space is an important direction in robotic drive system design.

2. High Torque Density: Achieving Greater Power Within a Limited Weight

For Mars Rovers, weight directly affects:

• Energy consumption

• Operating time

• Structural load

• Off-road capability

Compared with simply increasing motor size, a high torque density design can provide greater output capability with a smaller volume and lower weight.

This is also an important reason why highly integrated drive modules are receiving increasing attention in the robotics field.

3. Precise Control: Enabling Coordinated Multi-Wheel Motion

Mars Rovers usually have multiple drive wheels.

To ensure stable vehicle motion, the motors need to provide:

• Position feedback

• Speed control

• Torque control

• Closed-loop motion control capability

Precise feedback can help the control system:

• Adjust wheel speed

• Reduce slippage

• Improve obstacle-crossing capability

• Improve motion stability

4. High Reliability: Meeting Long-Term Operation Requirements

Mars Rovers, lunar rovers, and outdoor mobile robots typically need to operate for long periods of time.

Therefore, the drive system needs to provide:

• Stable mechanical structure

• Good heat dissipation capability

• Reliable control performance

• Continuous load capability

Key Specifications for Mars Rover Motor Selection

1. Motor Torque

Torque determines how much driving force the robot can generate.

For mobile robots, peak torque can help the system handle:

• Climbing slopes

• Sudden loads

• Passing obstacles

However, actual motor selection cannot focus only on peak torque; continuous output capability also needs to be considered.

2. Reduction Ratio

The reduction mechanism determines the speed and torque at the motor output.

A higher reduction ratio can generally provide:

• Greater output torque

• Better low-speed driving capability

While a lower reduction ratio can provide:

• Faster response

• Higher motion speed

Therefore, matching needs to be carried out according to the vehicle weight, wheel diameter, and target speed.

3. Motor Size and Weight

Mars Rovers are usually highly sensitive to space and weight.

Traditional drive systems may require:

• Motor

• Gearbox

• Encoder

• Driver

Multiple components are installed separately.

This solution increases:

• Structural complexity

• Assembly difficulty

• System weight

Therefore, highly integrated robotic actuators have become the choice for an increasing number of projects.

Why Do Mars Rover Projects Choose CubeMars Motors?

1. High Torque Density: Strong Driving Force in a Small Size

Traditional solutions usually require:

Motor + External Gearbox + Encoder + Driver

This structure can result in:

• Increased volume

• More complex installation

• Increased system weight

In contrast, the CubeMars AK Series adopts an integrated design that integrates multiple core components, making robot designs more compact.

For Mars Rovers, this means:

• Smaller installation space

• Lower overall vehicle weight

• Higher power output efficiency
  
  

This is also an important reason why robotics teams choose CubeMars as their drive solution.

2. Planetary Gear Reduction Structure: Balancing Torque and Reliability

Mars Rovers need to operate at low speeds and under high loads.

The planetary reduction structure offers advantages such as:

• High load-bearing capacity

• High transmission efficiency

• Compact size

• Relatively high reduction ratio

and other advantages.

CubeMars AK Series adopts an integrated planetary reduction structure, which can help mobile robots achieve higher wheel-end output torque.

For example:

AK70-10 KV100 adopts a 10:1 planetary reduction structure, which improves output capability while maintaining dynamic response, making it suitable for applications such as robotic joints and mobile robots.

3. Precise Control: Meeting the Requirements of Coordinated Multi-Wheel Motion

Mars Rovers not only need to “move,” but also need to “move precisely.”

CubeMars motors support multiple control methods, including:

• Position control

• Speed control

• Torque control

• MIT control mode

At the same time, high-precision encoders are integrated to achieve real-time motion feedback.

For a six-wheel Mars Rover, precise feedback can help:

• Synchronize wheel speeds

• Improve obstacle-crossing capability

• Reduce slippage

• Improve motion stability

CubeMars Powers the RoboTeam Twente Mars Rover

Introduction to the RoboTeam Twente Mars Rover Project

To develop a Mars Rover capable of adapting to complex terrain, RoboTeam Twente selected CubeMars motors as its robotic drive solution.

RoboTeam Twente is an interdisciplinary student robotics team from the Netherlands, consisting of students from the University of Twente and Saxion University of Applied Sciences. The team members cover multiple fields, including mechanical design, electronic systems, embedded control, software development, and artificial intelligence. The team is dedicated to developing advanced robotic systems and participating in international Rover competitions.

In the Mars Rover project, the robot needs to complete challenges similar to those encountered in real planetary exploration missions, including:

• Complex terrain movement

• Autonomous navigation

• Environmental exploration

• Robot task execution

   

Therefore, the drive system needs to simultaneously provide:

• High torque output

• Compact structure

• Stable control

• Long-term operational reliability

These requirements make the selection of motors and actuators a key part of project development.

Different Reduction Ratio Actuator Combinations for Balancing Power and Response

During operation, the Mars Rover's different motion requirements place different demands on the drive system.

For example, when facing:

• Slope climbing
• Soft ground

• Gravel obstacles

and other situations, the robot needs stronger output torque;

While when performing:

• Speed adjustment
• Precise motion control

• Coordinated multi-wheel operation

tasks, better dynamic response capability is required.

Therefore, RoboTeam Twente adopted a combination of CubeMars actuators with different reduction ratios to achieve a balance between power and flexibility according to different performance requirements.

AK45-36 KV80: Providing a High Reduction Ratio and Strong Output Capability

CubeMars AK45-36 KV80 adopts a 36:1 reduction ratio design.

A higher reduction ratio can effectively increase output torque, giving the robot stronger low-speed driving capability and load-bearing capability.

For the Mars Rover, when operating in complex environments, the vehicle needs to overcome:

• Ground resistance
• Slope loads

• Obstacle impacts

Therefore, high torque output is very important for improving the robot's traversability.

The characteristics of the AK45-36 KV80 make it suitable for drive scenarios that require strong power output, providing stable and reliable motion support for the Rover.

AK70-10 KV100: Balancing Power Output and Dynamic Response

CubeMars AK70-10 KV100 adopts a 10:1 reduction ratio design.

Compared with higher reduction ratio solutions, a lower reduction ratio can provide:

• Faster response speed
• More flexible motion control

• Better dynamic performance

For mobile robots, not every scenario requires maximum torque.

In applications that require rapid adjustment of the motion state and greater control flexibility, the AK70-10 KV100 can provide better dynamic performance.

Project video:

Why Does RoboTeam Twente Choose CubeMars Motors?

1. High Torque Output Meets the Requirements of Complex Terrain Movement

During operation, the Mars Rover needs to face:

• Sand

• Gravel

• Slopes

• Uneven ground

Compared with ordinary mobile robots, the Rover places higher demands on wheel-end power.

CubeMars AK Series actuators combine brushless motors with planetary reduction structures, helping mobile robots obtain stronger driving force through higher output torque while maintaining a compact size.

For Rover projects, this high torque density design can help the robot achieve stronger motion capabilities within limited space.

2. Highly Integrated Design Reduces System Development Difficulty

Traditional robotic drive solutions usually require separate selection of:

• Motor

• Reducer

• Encoder

• Driver

Then mechanical and control matching is carried out.

For student robotics teams or research projects, this increases:

• Mechanical design workload

• Debugging time

• System integration difficulty

CubeMars robotic actuators integrate core motion components, including:

• Brushless motor

• Reduction mechanism

• Encoder

• Drive control

Providing a more modular power solution.

This design can help the team focus more on:

• Rover structural design

• Control algorithm development

• Autonomous navigation systems

Instead of spending a great deal of time solving basic drive integration problems.

3. Precise Control Improves Rover Motion Stability

Mars Rovers typically use multiple drive wheels for coordinated motion.

In complex environments, the robot needs to adjust in real time:

• Wheel speed

• Output torque

• Motion state

CubeMars actuators support closed-loop control and provide real-time motion information through encoder feedback, enabling the control system to achieve more precise motion management.

This is very important for Rovers that need to complete complex terrain tasks.

What Types of Robots Are CubeMars Drive Solutions Suitable For?

In addition to Mars Rovers, CubeMars motors and actuators are also suitable for:

1. Mobile Robots

For example:

• UGVs

• Inspection robots

• Outdoor robots

2. Industrial Robots

For example:

• AGVs

• Automation equipment

• Intelligent logistics robots

3. High-Performance Robots

For example:

• Humanoid robots

• Quadruped robots

• Robotic arms

How to Choose the Right Motor for Your Mars Rover?

When selecting a Mars Rover Motor, you can follow the steps below:

1. Determine the Robot Weight

Including:

• Vehicle body

• Battery

• Payload

• Mechanical structure

2. Determine the Wheel Parameters

Including:

• Wheel diameter

• Tire type

• Contact area

3. Calculate the Required Torque

Consider:

• Maximum slope

• Ground resistance

• Maximum load

4. Match the Reduction Ratio

According to:

• Speed requirements

• Torque requirements

• Dynamic response

Select the appropriate solution.

5. Confirm the Control Requirements

Select:

• Speed control

• Position control

• Torque control

Conclusion

Mars Rover motor selection is not simply about finding a motor with the maximum torque, but about finding the best balance between power performance, structural size, weight, control precision, and overall system reliability.

For complex mobile robots such as Mars Rovers, the drive system not only determines whether the robot can move, but also affects its traversability, stability, and overall performance in real mission environments.

CubeMars has developed highly integrated motion control solutions for robotic applications by combining:

• High-performance brushless motors

• Planetary reduction mechanisms

• Encoder feedback

• Flexible control methods

Providing reliable power support for Mars Rovers, UGVs, mobile robots, and other intelligent robotic platforms.

The application of the RoboTeam Twente Mars Rover project demonstrates the practical value of the CubeMars drive solution in the field of robotic exploration. For teams developing projects involving Mars Rovers, lunar rovers, unmanned mobile platforms, or research robots, selecting suitable robotic motors and actuator solutions is an important step toward improving system performance and shortening the development cycle.

In the future, as robotics technology continues to develop, high-performance, highly integrated, and easy-to-deploy drive systems will play an increasingly important role in planetary exploration, industrial automation, and autonomous mobile robotics.

CubeMars is committed to providing reliable power solutions for robot developers worldwide, enabling robots to achieve stronger motion and exploration capabilities.