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Brushless Motor VS Brush Motor

Dec 30, 2019

The comparison between the brushless motor and the brush motor is as follows:

Disadvantages of brush motor

1. Great friction and loss  
Old model friends used to encounter this problem when playing with the brush motor, that is, after using the motor for a period of time, they need to turn on the motor to clean the carbon brush of the motor, which is time-consuming and laborious, and the maintenance intensity is no less than a family cleaning.

2. High heat and short life
Due to the structure of the brush motor, the contact resistance between the brush and the commutator is very large, resulting in the overall resistance of the motor is large and easy to heat, while the permanent magnet is a thermal element. If the temperature is too high, the magnet steel will demagnetize, which will degrade the performance of the motor and affect the life of the brush motor.

3. Low efficiency, low output power
The heating problem of the above mentioned brush motor is largely due to the current work on the internal resistance of the motor, so the electric energy is largely converted into heat energy, so the output power of the brush motor is not large, and the efficiency is not high.

Brushless DC motor

Advantages of Brushless DC motor

1. No brush, low interference
The most direct change is that there is no electric spark generated when the brush motor is running, which greatly reduces the interference of the electric spark to the remote control radio equipment.

2. Low noise, smooth operation
Without the brush, the friction is greatly reduced, the running is smooth, and the noise is much lower. This advantage is a huge support for the running stability of the model.

3. Long life, low maintenance cost
Without electric brush, the wear of the brush less motor is mainly on the bearing. From the mechanical point of view, the brush less motor is almost a maintenance free motor. When necessary, it only needs to do some dust removal maintenance. In the next comparison, we will know the advantages of the BLDCM compared with the BLDCM, but everything is not absolute. The performance characteristics of the BLDCM, such as excellent low-speed torque performance and large torque, are irreplaceable. However, in terms of the ease of use of the BLDCM, with the declining cost of the BLDCM and the development of the BLDCM technology at home and abroad, it is competing with the market At the same time, the development of model motion is greatly promoted.