How to choose BLDC Motor correctly?

BLDC Motor（Dc brushless motor） has the advantages of high power density, high efficiency and long life compared with ordinary traditional motor. Dc brushless motor has simple structure, few components, so it is easy to maintain and has a long service life. It is now widely used in robots, automated production lines, medical equipment, automobiles and other fields.

Key factors in choosing a DC brushless motor:

1. Rated torque and rated current of the motor

This is one of the most basic parameters of the DC brushless motor, the rated torque and rated current of the motor can reflect the ability and performance of the motor. In the selection, it is necessary to determine the required torque and current according to the specific use requirements.

2. Speed range of the motor

The speed range of the DC brushless motor is generally wide, generally from hundreds to tens of thousands of revolutions, so the selection needs to determine the speed range according to the specific application scenario. In general, it is necessary to ensure that the torque output at the rated speed of the motor reaches the required workload when it is running, so as to ensure the stable and reliable operation of the motor.

3. Size and quality of the motor

Overall size and quality are also one of the key factors in the selection of DC brushless motors, which is related to the specific use requirements and scenarios. For some scenarios requiring small size and light weight, miniaturized DC brushless motors need to be selected.

4. Motor control mode

There are three main control methods of brushless DC motor: Hall control, sensor out-of-step control and inductive feedback control. In the selection, it is necessary to determine which control mode to choose according to the specific application scenario and use requirements.

Match motor drivers and controllers

After selecting the DC brushless motor, it is also necessary to select the appropriate motor driver and controller. In general, the brand and model of the driver and controller should be consistent with the motor, so as to ensure the stability and reliability of the system.

The main parameters for selecting a brushless DC motor are as follows:

1. Maximum torque: It can be obtained by adding the load torque, moment of inertia and friction, in addition, there are some additional factors that affect the maximum torque such as the resistance of the air gap.

2. Square mode torque: It can be approximated as the continuous output torque required for practical applications, which is determined by many factors: maximum torque, load torque, moment of inertia, acceleration, deceleration and running time.

3. Speed: This is the speed of the application demand, can be determined according to the speed ladder curve of the motor to determine the speed of the motor demand, usually calculated to leave a 10% margin.

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