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How do I know what size brushless motor I need?

Views: 11     Author: Site Editor     Publish Time: 2023-04-26      Origin: Site Inquire

Brushless DC motors are widely used in industries such as AI intelligence, automobiles, medical equipment, and industrial automation due to their long life, low noise, and high torque. Because of their different specifications and types, how to choose a brushless DC motor depends on It is very important to meet product performance requirements. In this article, we will introduce several principles for selecting brushless motors.

Brushless motor is also a kind of equipment commonly used in industrial production in recent years. There are many models of this equipment to choose from on the market. The models of the products are different, but the others are the same. What about suitable electrical equipment?

The structural specifications of brushless motors include planetary gearboxes, cylindrical gearboxes, parallel spur gearboxes, and worm gearboxes.


The material level is divided into metal structure and plastic structure; the power level is divided into high-power and low-power brushless motors.

1. Determine the motor’s use path, application scenario, environmental requirements, working temperature and other factors before purchasing.

2. First determine what kind of motor is needed, such as low power, high torque, low speed, noise, power, parameters and other power and performance requirements.

3. Determine the torsion stone, installation method and maintenance method of the output shaft.

4. Determine the rotation speed and reduction ratio of the input transmission shaft.

5. Select a brushless motor according to the size of the flange of the machine. If the output shaft drags the hammer insufficiently, return to 2 and re-match.

Brushless motors of different specifications and models have different usage territories and usage characteristics. Therefore, we must understand our own needs clearly before purchasing, and do not buy blindly.

Features of brushless motors

1. Brushless, low interference

The brushless motor removes the brush, and the most direct change is that there is no electric spark generated when the brushed motor is running, which greatly reduces the interference of electric sparks on remote control radio equipment.

2. Low noise and smooth operation

There are no brushes in the brushless motor, the friction force is greatly reduced during operation, the operation is smooth, and the noise will be much lower. This advantage is a huge support for the stability of the model operation.

3. Long life and low maintenance cost

Without the brush, the wear of the brushless motor is mainly on the bearing. From a mechanical point of view, the brushless motor is almost a maintenance-free motor. When necessary, only some dust removal maintenance is required.

Selection of brushless motor

In the case that we can adjust the power supply and voltage of the product, we need to choose a brushless DC motor with a corresponding torque, speed and product corresponding to the rated value according to the actual situation. We can get the required speed by changing the voltage. When the power supply voltage is fixed and the brushless motor that directly matches cannot be selected, we can first select the appropriate specification according to the torque. The product voltage and speed can be used as an appropriate adjustment.

Power selection of brushless motor

The maximum output power of the motor is limited. If the power of the brushless motor is too small and the load exceeds the rated output power, the motor will be overloaded. When overloaded, the motor will heat up, vibrate, the speed will drop, and the sound will be abnormal, which is serious. When overloaded, the motor will be burned. And if the power is too large, it will cause economic waste. Therefore, it is very important to choose the power of the motor reasonably.

Working principle of brushless motor

A brushless DC motor avoids the need for a commutator and brushes by having its permanent magnets in the rotor. Rotation of the rotor is maintained by detecting the position of the rotor magnetic poles and switching the electric current flow through the coils accordingly.



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