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Lets you quickly understand the characteristics of brushed and brushless motors
- Apr 02, 2018 -

With the increasing popularity of electric vehicles and fierce competition in the market, many companies and businesses have also played ads in small details of electric cars, in addition to making a fuss about the product price and appearance. The most popular is brushing and brushless propaganda for motors, and brushless motor advertising is one of the highlights. When you see this term, you can't help but think that if there is no brush, there must be a brush, then where is the difference between brush and brushless? The following Xiaobian will answer you.

A brushless and brushed motor performance comparison

1, friction, loss

Some friends often encounter this problem when using a brush motor, that is, after using the motor for a period of time, it is necessary to open the motor to clean the brush of the motor, which is time-consuming and labor-intensive, and the maintenance intensity is no less than a home cleaning.

2. Big heat, short life

Due to the structure of the brush motor, the contact resistance between the brush and the commutator is large, resulting in a large overall resistance of the motor and easy to generate heat. The permanent magnet is a thermal element. If the temperature is too high, the magnetic steel will demagnetize. The performance of the motor is degraded and the life of the brushed motor is affected.

3. Low efficiency, low output power

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

II. The advantages of brushless motors

1, no brush, low interference

The brushless motor removes the brush. 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 on remote radio equipment.

2, low noise, smooth operation

The brushless motor has no brush, friction is greatly reduced during operation, and the operation is smooth and the noise is much lower. This advantage is a great support for the stability of the model operation.

3, long life, low maintenance costs

With fewer brushes, the wear of the brushless motor is mainly on the bearing. From the mechanical point of view, the brushless motor is almost a kind of maintenance-free motor. When necessary, only some dust removal and maintenance can be done.

From the comparison between the next one and the next, we know where the advantages of brushless motors are compared to brushed motors, but everything is not absolute. Brushless motors have excellent performance at low speeds and high torque, and they have high torque and are not replaced by brushless motors. With regard to the ease of use of the brushless motor, the brushless power system is undergoing rapid development and popularization with the cost reduction trend of the brushless controller and the development of the brushless technology at home and abroad and the market competition, which also greatly promotes. The development of domestic brushless motors.

III. From the trend point of view, brushless motor deceleration may replace the brush micro-gear motor

1, the scope of application:

Brushless motor: It is usually used in equipment with high control requirements and high speed, such as model airplanes, precision instrumentation, etc., which strictly control the speed of the motor, the speed is very high, and the most advanced hand dryer is now. The brushless motor dihour hand dryer produced by Dior Electric also uses this kind of motor. The cost of its motor and controller is very high, so later high-end equipment was used. Brush motor: Usually the power equipment uses brush motors, such as blowers, factory motors, home range hoods, etc. In addition, the speed of the series motors can reach high, but due to the wear of carbon brushes, use Life is not as good as brushless motors.

2, service life:

Brushless motors: The service life is usually in the order of tens of thousands of hours, but the lifespan of brushless motors is also very different due to the different bearings. Brush motor: Usually the brush motor has a continuous working life of several hundred to more than one thousand hours. When it reaches the limit of use, the carbon brush needs to be replaced, otherwise it is easy to cause bearing wear.

3, the use of effects:

Brushless motor: It is usually a digital variable frequency control with a high degree of controllability. It can be easily realized from a few revolutions per minute to tens of thousands of revolutions per minute. Brush motor: After the brushless motor is started, the working speed is constant and the speed is not very easy. The series motor can reach 20,000 rpm, but the service life will be shorter.

4, energy saving and environmental protection:

Relatively speaking, brushless motors with variable frequency technology control will save a lot of energy than series motors. The most typical ones are inverter air conditioners and refrigerators.

5, future maintenance

The carbon brush motor needs to replace the carbon brush. If it is not replaced in time, the motor will be damaged. The brushless motor has a long service life, which is usually more than 10 times that of the brush motor. However, if the motor is broken, the motor needs to be replaced. However, the routine maintenance is basic. No need.

6, noise

Noise is not related to whether there is a brush motor, mainly to see the bearing and click the internal components of the situation.

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