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Advantages and disadvantages of brush motor and brushless motor

source:Dongguan Sudong Electronic Technology Co.,Ltd release time:2017-06-03 Browse:423
Brush motor is the current through the carbon brush and the rotation of the commutator contact, constantly changing the current winding, so that the motor to maintain continuous rotation, the following shortcomings:
1. Large friction, large loss
    
Carbon brush and rotary commutator friction, so that the carbon brush and commutator constantly wear, brush motor continuous working life in a few hundred to more than 1,000 hours, reach the use of the limit you need to replace the carbon brush, or very easy Resulting in commutator and carbon brush wear.
2. Heat big, short life
    
As the structure of the brush motor, brush and commutator contact resistance is large, resulting in a larger overall resistance of the motor, easy to heat, and permanent magnet is a thermal element, if the temperature is too high, then the magnet is demagnetized , So that motor performance, affecting the life of brush motor.
3. Low efficiency, low output power
    
Brush motor heating problem, largely because the current work done in the motor internal resistance, so a large degree of energy into heat, so the brush motor output power is not large, its efficiency is not high, generally 70% about.
 

Brushless motor to replace the mechanical commutation of electronic commutation, running almost no noise, life expectancy of up to 10 years, specifically have the following advantages:
1. No friction, low interference
    
Brushless motor because there is no brush, so the motor running friction greatly reduced, running very smooth, the noise will be much lower, while there is no carbon brush motor running sparks, which greatly reduces the spark on the radio Equipment interference.
2. Long life, low maintenance costs
    
Brushless motor because there is no brush, friction is mainly on the bearing, from the mechanical point of view, brushless motor is almost a maintenance-free motor, and usually life in the tens of thousands of hours this order of magnitude, is a brush motor 10 Times more than.
3. High efficiency
    
Brushless motor efficiency is generally about 85%, about 15% higher than the brush motor, so more energy than the brush motor.
4. Use effect
    
Brushless motor is usually digital frequency control, controllable strong, from every few minutes to tens of thousands of turn is easy to achieve.