What are the advantages and disadvantages of brushless DC motor and brushless DC motor?

The difference in a nutshell is:

Brushed DC Motor fixed a set of carbon brushes on the rotor in contact with the AC excitation of the electrode, to provide the rotor required electromagnetic field;

The rotor of the Brushless DC Motor does not have a fixed carbon brush, and the rotor generates an electric field by controlling a controller via a sensor.

Advantages and disadvantages of brushless DC motor

Advantages:

1. Electronic commutation has always replaced the traditional mechanical commutation, reliable performance, low failure rate;

2. Static motor, small no-load current;

3. Parts wear less, long life, no need to replace the brush;

4. Can move at a higher speed;

5. With high efficiency and small size volume, it is suitable for light, small, high-speed modular and integrated applications.

Cons:

1. There is slight vibration when starting at low speed. If the speed increases and the commutation frequency increases, the vibration phenomenon will not be felt;

2. Easy to form resonance, because any thing has a natural vibration frequency, if the vibration frequency of the brushless motor is the same or close to the vibration frequency of the frame or plastic parts, it is easy to form a resonance phenomenon, but the resonance phenomenon can be reduced to a minimum by adjusting. Therefore, it is a normal phenomenon that electric vehicles driven by brushless motors sometimes emit a buzzing sound.

3. The control is more complex, requiring more accurate control algorithms and high-precision sensor information input;

4. High cost.

Advantages and disadvantages of brushed DC motor

Advantages:

1. Smooth speed change, almost can not feel the vibration;

2. Low temperature rise;

3. Easy to control at the beginning of rotation;

4. Can withstand overload higher than the rated load operation;

5. Maintenance is relatively simple and the price is relatively cheap.

Cons:

1. Carbon brush is easy to wear, short life, need to replace the brush frequently;

2. The running current is large, and the magnetic steel of the motor is easy to demagnetize, which reduces the life of the motor.

3. Easy to drop speed under light load, large speed fluctuation, low accuracy;

4. Electromagnetic interference (EMI) and electronic noise.

In summary, brushless motors are more and more widely used because of their advantages of high power density, low wear durability, and high load and high speed applications. Brush motors have the advantages of strong execution and relatively cheap price, and still maintain a certain competitiveness in specific application fields

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