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How to choose the correct micro brushless motor?


Micro brushless motors are used in applications ranging from drones and remote-controlled vehicles to medical equipment and robotics. Choosing the right micro brushless motor is critical to ensuring optimal performance and efficiency.

This article will guide you through the process of selecting the right motor by exploring key considerations and factors to consider.

1. Understand micro brushless motors

A. Definition and working principle:

- Micro brushless motors are compact motors which using brushless technology.  

- They consist of a rotor and a stator. The rotor rotates due to the interaction between permanent magnets and electromagnetic coils in the stator.  

- Unlike brushed motors, micro brushless motors have no physical brushes that wear out, resulting in longer life and improved reliability.

 B. Advantages over brushed motors:

- Higher efficiency: Micro brushless motors offer higher energy efficiency because they have no brushes that cause friction.  

- Enhanced durability: The absence of brushes reduces mechanical wear, resulting in longer service life.  

- Increased power density: Micro brushless motors can provide higher power output in a smaller form factor compared to brushed motors. 

- Improved accuracy: Brushless motors provide smoother, more accurate control with their digital feedback system.

2. Factors to consider when choosing a micro brushless motor

A. Power requirements:

1. Know the voltage and current ratings:

- Determine the voltage and current requirements of the application by analyzing the power supply specifications.

2. Calculate the power requirements of your application:

- Use an online calculator or consult an expert to determine the appropriate power requirements for your specific application.

B. Motor size and weight:

Evaluate compactness and form factor:

- Consider the space available in the application and choose a motor size that fits without compromising functionality.

- Evaluate form factors (cylindrical, square, etc.) and mounting options to ensure compatibility.   

- Evaluate the weight constraints imposed by your application, such as the payload capacity of a drone or the weight constraints of a robot.

- Make sure the selected motor is light enough to meet these requirements without sacrificing performance.

C. Motor control:

1. Compatibility with ESCs and controllers:

- Make sure the motor is compatible with the electronic speed controller (ESC) and motor controller used in your application.

- If necessary, check compatibility with communication protocols such as PWM or I2C.

2. Understand PWM and other control technologies:

- PWM (Pulse Width Modulation) is commonly used for speed control of brushless motors.    - Explore other control techniques such as sensorless control or sensor feedback for more advanced applications.


Choosing the right brushless motor is crucial for the success of your project. By understanding the basics of brushless motors and evaluating the relevant factors, you can make an informed decision that meets your specific needs and constraints. Remember to do your research, seek expert advice, and opt for reliable brands to ensure the best performance and durability of your brushless motor.

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Post time: Oct-20-2023
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