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 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. Comparing up and down, you will know the advantages of brushless motors over brushed motors, but everything is not absolute. Brushless motors have excellent low-speed torque performance, large torque and other performance characteristics that are irreplaceable for brushless motors. However, In terms of the ease of use of brushless motors, with the downward trend of the cost of brushless controllers and the development and market competition of brushless technology at home and abroad, brushless power systems are in the stage of rapid development and popularization, which also greatly promotes development of the model movement.

harm:

(1) Large friction and large loss

Old model friends have encountered this problem when playing with brushed motors before, that is, after using the motor for a period of time, it is necessary to open the motor to clean the carbon brushes of the motor, which is time-consuming and laborious, and the maintenance intensity is no less than a family cleaning.

(2) High heat generation and short service life

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 prone to heat, and the permanent magnet is a heat-sensitive element. If the temperature is too high, the magnetic steel will demagnetize , so that the performance of the motor decreases, affecting the life of the brushed motor.

(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 largely converted into heat energy, so the output power of the brushed motor is not high, and the efficiency is not high.

The role of brushless motor

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. In general, what are brushless motors good for? 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, so that the electric fan can rotate and bring a cool feeling to everyone. In addition, the lawn mowers in the garden industry are also practical brushless motors. In addition, electric drills in the power tool industry also use brushless motors. The function of the brushless motor is actually to convert electrical energy into mechanical energy, so that it can play a role in our lives and improve our quality of life.

Lifespan of brushless motors

The service life of brushless motors is usually on 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 problems (generally the aging time exceeds 10 Years, how to avoid coil aging? This requires that the temperature of the coil should not be too high, and ensure good heat dissipation, thereby prolonging its service life. Of course, overheating and burning also fall into this category.) Obviously, bearings and coils are very important for brushless motors. lifespan is very important. Don't think that small motors occupy a small place in the device and are very inconspicuous. If the motor you buy is of low quality, and the parts used by the low-end brand motors (such as bearings and coils) are of poor quality, the equipment should replace the motor, and once there is a problem, the motor should replace the bearing coil. , I feel troublesome even thinking about it.

Second, environmental factors Brushless DC motors should be used in a ventilated, dry, non-corrosive environment, and the air temperature and pressure are normal. If there are corrosive gases and high humidity in the harsh environment, it is easy to damage the electrical and mechanical properties 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 do brushless motors last? This is really not a good arbitrary answer, as its lifespan really depends on many factors. Of course, a good quality motor will necessarily last longer than a poor quality motor.

Finally, due to the different technical levels of personnel operating brushless motors, unexpected errors may occur when operating the motor, such as stopping immediately after starting. Overload start; Faulty start will cause damage to the brushless motor, thus affecting its service life. Although the many advantages of brushless motors attract more and more users, it is still strongly recommended: If users know nothing about brushless motors, it is recommended to use familiar motors or use them under the guidance of the motor manufacturer.

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