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How to Choose a Brushless DC Motor?

Views: 45     Author: Site Editor     Publish Time: 2023-08-15      Origin: Site

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how do we choose the best BLDC motor for our product?


Brushless motors have the characteristics of low noise and high torque, and are widely used in industrial machinery, medical equipment, AGV trolleys and other fields. Due to their different specifications and types, it is very important to choose a suitable brushless DC motor to meet product performance requirements. 


Determine application specifications for your brushless DC (BLDC) motor


Before choosing a brushless DC (BLDC) motor for your application, it is essential to consider various factors. These factors include speed, torque, and duty cycle requirements, as well as other critical aspects such as voltage and current capacities of the power supply. You should also determine whether your system will operate in an open-loop or closed-loop configuration and whether velocity, current, or position control is necessary.


Additionally, it is important to take into account the axial and radial loads that will be exerted on the motor shaft. Consider the required storage and operating temperature ranges, as well as any specific environmental conditions that may impact the motor's performance.In summary, when specifying a BLDC motor for your application, consider the following:

  • Speed, torque, and duty cycle requirements.

  • Voltage and current capacities of the power supply.

  • Open-loop or closed-loop system configuration.

  • Control requirements: velocity, current, or position control.

  • Axial and radial loads on the motor shaft.

  • Required storage and operating temperature ranges.

  • Environmental conditions that may affect motor performance.


By carefully considering these factors, you can ensure that the selected BLDC motor is suitable for your specific application requirements.


What voltage and current do you have available?

Indeed, in addition to considering torque and speed information, other factors are also important in making the right choice. In many cases, we will be restricted, whether it is from the battery or the restrictions imposed by the project. Therefore, when selecting a BLDC motor, the operating conditions and possible extremes need to be considered.



Here are some factors that may need to be considered:


1. Start-up

At start-up, there may be a current peak that is necessary to overcome the inertia of the application.

2. Battery Voltage

As the battery charge cycle changes, the voltage may change over time. This can have an effect on the controller itself and cause an increase in current draw when the voltage drops.

3. Efficiency

It is always important to account for inefficiencies in calculations. This can go unnoticed, but can lead to overly high expectations for the mechanical output power of the motor. For example, gearboxes are typically 75% efficient, electric motors are around 70-90% efficient, and controllers are typically 90% efficient. Therefore, if a 1 kW supply is used to supply the brushless motor and gearbox, the expected mechanical output power will be 50-75%. Of course, there are ways to reduce this effect.

In summary, please consider the above factors as well as other applicable limitations when selecting a BLDC motor suitable for your product. If you have any related questions or concerns, please contact us directly and we will be happy to help. E-mail: holry@holrymotor.com


From the voltage point of view, our brushless motors have 24V, 48V, 310V, etc., and also support customized services. If you are not sure how to choose your equipment, you can also contact us. We have a professional technical team and technical consultants. If you have doubts, you can contact us at any time.


Selecting the most important features and performance criteria you require in brushless dc motor

Once you have identified space and power constraints, it is critical to determine the functions required of the motor to ensure successful integration into your application. You need to consider the following questions and specific product requirements to determine the type of motor that your product is suitable for:

1. Do you need high position accuracy or velocity accuracy?

2. Are energy efficiency and longevity a top priority?

3. Do you need to maintain constant torque or constant speed?

4. Are there significant unit costs or project deadline constraints that could influence the decision?


If high positional accuracy is critical, stepper motors are the best choice because they can be controlled with micro-control to achieve precise movement, even in increments as small as 1/100th of a degree or more. They excel in applications where positional accuracy is more important than efficiency or speed, such as metrology or industrial applications.


If energy efficiency is more important than positional accuracy, brushless DC motors are an appropriate choice. They have a longer lifespan than brushed DC motors and outperform stepper motors in terms of efficiency.


Once you identify the most important characteristics of your application, you can make an informed decision. Here is a simplified overview of choosing a motor based on your main performance priorities:

1. High Position Accuracy

Choose stepper motors for precise and controllable motion.

2. Energy Efficiency and Lifespan

Choosing a brushless DC motor improves efficiency and increases lifespan compared to brushed DC motors.

3. Constant Torque or Constant Speed

Consider the type of motor that can maintain the desired torque or speed at all times.

4. Costs and Project Deadlines

Evaluate unit costs and project timelines to ensure the selected motor meets budget and time constraints.

By prioritizing key performance factors and considering the trade-offs between motor types, you can select the most suitable motor for your specific application.


Video of Brushless motor


Classification of brushless motor

Brushless motors are subdivided according to the size of the motor, divided into: 42BLDC, 57BLDC, 60BLDC, 80BLDC, 86BLDC, 110BLDC, and each model is also divided in detail, corresponding to different sizes, also And different voltage, power and speed, if you have any questions, you can contact us.





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