The pros and cons of brushless motors

benefit:

(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 the electric spark to the remote control radio equipment.

(2) Low noise and smooth operation

The brushless motor has no brushes, 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.

(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 need to do some dust removal maintenance. By comparing the previous and the next, you will know the advantages of the brushless motor over the brushed motor, but everything is not absolute. The brushless motor has excellent low-speed torque performance and large torque. The performance characteristics of the brushless motor are irreplaceable, but In terms of the ease of use of brushless motors, with the trend of cost reduction of brushless controllers and the development and market competition of brushless technology at home and abroad, the brushless power system is in the stage of rapid development and popularization, which also greatly promotes development of the model movement.

harm:

(1) The friction is large and the loss is large

Old model friends have encountered this problem when playing with brushed motors in the past, that is, after using the motor for a period of time, it is necessary to turn on the motor to clean the carbon brushes of the motor, which is time-consuming and labor-intensive, and the maintenance intensity is no less than a household cleaning.

(2) The heat is large and the life is short

Due to the structure of the brushed motor, the contact resistance between the brush and the commutator is very large, resulting in a large overall resistance of the motor, which is easy to generate heat, and the permanent magnet is a heat-sensitive element. If the temperature is too high, the magnetic steel will be demagnetized. , so that the performance of the motor is degraded and the life of the brushed motor is affected.

(3) Low efficiency and low output power

The heating problem of the brushed motor mentioned above is largely due to the fact that the current does work on the internal resistance of the motor, so the electric energy is converted into heat energy to a large extent, so the output power of the brushed motor is not large, and the efficiency is not high.

The role of brushless motors

A brushless motor is also a device that converts electrical energy into mechanical energy. By consuming electrical energy, mechanical energy can be obtained to achieve certain purposes. What is the use of a brushless motor in general? It can be used in the small home appliance industry, such as the common electric fan. In fact, the brushless motor converts electrical energy into mechanical energy, and the electric fan will turn and bring you a cool feeling. In addition, the lawn mower in the garden industry actually uses a brushless motor. In addition, electric drills in the power tool industry also use brushless motors. The role of the brushless motor is to convert electrical energy into mechanical energy, so that it can play a role in everyone's life and improve everyone's quality of life.

Service life of brushless motors

Brushless motors usually have a service life of the order of tens of thousands of hours, but the service life of brushless motors is also very different due to different bearings.

First of all, three aspects are related to the factors of the brushless motor itself: 1. Bearing life (the bearing needs to be replaced once the bearing is damaged) 2. Magnetic steel demagnetization (this is helpless unless you can magnetize it) 3. Coil problem (generally, the aging time exceeds 10 Years, how to avoid the coil aging? This requires that the temperature of the coil should not be too high, and ensure good heat dissipation, thereby extending its life. Of course, overheating and burning also fall into this category.) Obviously, the bearing and coil are very important to brushless motors. lifespan is very important. Don't think that the small motor occupies a small place in the device and is very inconspicuous. If you buy a lower quality motor and the lower end brand motors use lower quality components such as bearings and coils, the unit should replace the motor, and in the event of a problem, the motor should replace the bearing coils. , It's troublesome to think about.

Second, environmental factors DC brushless motors should be used in a ventilated, dry, non-corrosive environment with normal air temperature and pressure. If there are corrosive gases and high humidity in harsh environments, it is easy to damage the electrical and mechanical performance of the motor due to environmental factors. Therefore, corresponding motor protection measures must be taken according to the environmental conditions. So, when asked how long can a brushless motor last? This really isn't a good arbitrary answer, as its longevity really depends on many factors. Of course, a good quality motor is bound to last longer than a poor quality motor.

Finally, due to the different skill levels of those who operate brushless motors, unexpected errors can occur when operating the motor, such as stopping immediately after starting. Overload start; fault start can cause damage to the brushless motor, thus affecting its service life. Although the advantages of brushless motors have attracted more and more users, Bian Xiao still strongly recommends: if users know nothing about brushless motors, it is recommended to use a familiar motor or use it under the guidance of the motor manufacturer.