I. Comparison of brushless and brushless motor performance
1, large friction, large loss
This problem is often encountered when using a brush motor. After using the motor for a period of time, you need to open 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 household cleaning.
2. High fever and short life span
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 and easy heating. As the permanent magnet is a heat-sensitive element, if the temperature is too high, the magnetic steel will be demagnetized, which will reduce the performance of the motor and affect the life of the brushed motor.
3. Low efficiency and small output power
The heating problem of brushed motor mentioned above is largely because 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 brushed motor is not high and the efficiency is not high.
Two. Brushless motor advantages
1, no brush, low interference
The brushless motor eliminates the brush, the most immediate change is that there is no electrical spark generated when the brushless motor is running, which greatly reduces the interference of electrical spark to remote control radio equipment.
2, low noise, smooth operation
Brushless motor without brush, running friction greatly reduced, smooth operation, noise will be much lower, this advantage for the model running stability is a huge support.
3, long life, low maintenance cost
Less brush, brushless motor wear is mainly on the bearing, from the mechanical point of view, brushless motor is almost a kind of maintenance free motor, when necessary, just do some dust removal maintenance.
Next comparison, we know where the advantages of brushless motor relative to brushless motor are, but everything is not absolute, brushless motor low speed torque performance, torque and other performance characteristics are irreplaceable brushless motor, but from the point of view of the convenience of brushless motor, with the cost of brushless controller declining trend and the development of brushless technology at home and abroad and market competition, Brushless power system is in the rapid development and popularization stage, which also greatly promoted the development of domestic brushless motor.
3. From the trend point of view, brushless motor deceleration may replace brush deceleration motor
1. Scope of application:
Brushless motor: it is usually used in the equipment with high control requirements and high speed, such as model aircraft, precision instruments and meters, which strictly control the motor speed and have very high speed. The cost of the motor and controller is very high, so the relatively high-end equipment is used later.
Carbon brush motor: Brush motor is usually used in power equipment, such as hair dryer, factory motor, household range hood and so on. In addition, the speed of series motor can also reach very high, but because of the wear of carbon brush, the service life is not as good as that of brushless motor.
2. Service life:
Brushless motor: the service life is usually tens of thousands of hours of this order of magnitude, but because of the different bearing brushless motor service life is also very different.
Carbon brush motor: Usually brush motor continuous working life in several hundred to more than 1,000 hours, reach the use limit, need to replace the carbon brush, otherwise it is easy to cause bearing wear.
3. Use effect:
Brushless motor: Usually digital frequency conversion control, strong controllability, from a few revolutions per minute, to tens of thousands of revolutions per minute can be easily realized.
Carbon brush motor: brushless motor generally starts at a constant speed, and speed regulation is not very easy. Series motor can also reach 20000 RPM, but its service life will be shorter.
4. Energy saving and environmental protection:
Relatively speaking, the brushless motor controlled by frequency conversion technology will save a lot of energy than the series motor, the most typical is frequency conversion air conditioning and refrigerator.
5. Future maintenance
The carbon brush motor needs to be replaced, which will cause damage to the motor if not replaced. The brushless motor has a long service life, usually more than 10 times that of the brush motor. However, if it is broken, the motor needs to be replaced, but the daily maintenance is basically not needed.
6. Noise
Noise has nothing to do with whether there is a brush motor, mainly depends on the coordination of bearings and click internal components.
