What is the difference between brushed motor and brushless motor?

Motor is divided into two kinds of brushless motor and brushless motor, may many friends for brush and brushless is not clear enough, not enough to understand, then brush motor and brushless motor what is the difference? What are the pros and cons?
 

Advantages and disadvantages of brushless motor:

Advantages:

1, low running sound

This is where our civilization is headed. Other tools need to reduce noise to protect our sound environment. Now it is important to use it in some quiet places, such as hospitals, banks, airports, schools and so on.

2. In some cases there will be no sparks, there are some flammable and explosive places.

3. Long life

Because the controller replaces the commutator and the carbon brush, it is several times or even ten times the brush motor. The service life of the carbon brush is limited. For example, a carbon brush will wear out after a thousand hours. Only the brushes can be replaced, while the motor can be replaced.

4. High speed

Thanks to the use of magnetic field induction, the contact speed can be accelerated.

Cons:

1. High cost

The cost of the controller will increase by at least 100 yuan. Take micromotors for example. The original commutator and carbon brush cost much less.

2. If the environment used is in a place with a strong magnetic field, or has been in contact with or close to a strong magnetic field, the motor will lose its function, because the rotor part of the motor itself is magnetized by a magnetic field and a high magnetic field will change the magnetic field of the rotor or eliminate part of the electromagnetic motor can not work properly.

Advantages and disadvantages of brush motor

Advantages:

1. Simple structure

The brush motor has simple structure, easy production and processing, easy maintenance and easy control; Dc motors also have the characteristics of fast response speed, large starting torque, and can provide rated torque performance from zero speed to rated speed.

2. Smooth operation, good starting and braking effect

Brush motors regulate speed through voltage regulation, so starting and braking are stable, and are also stable at constant speed. Brushless motors are usually controlled by digital frequency conversion. First, AC becomes DC, then DC becomes AC, and then speed is controlled by frequency changes. Therefore, only at constant speed, the brushless motor will operate unevenly and vibrate during starting and braking. It'll be stable.

3. High control accuracy

Brush motors are usually used with transmissions and encoders to make the motor's output power larger and control accuracy higher, the control accuracy can reach 0.01 mm, almost anywhere you want to stop moving parts. All precision machines use DC motors to control accuracy.
 

Cons:

1. There is friction between the brush and the commutator, resulting in reduced efficiency, increased noise and easy heat. The service life of a brushed motor is several times that of a brushless motor.

2. The maintenance is troublesome and the brush needs to be replaced constantly.

3. Due to large resistance, low efficiency and low output power.

4. Friction between the brush and the commutator will produce sparks and create a lot of interference.

Dongguan NOYU Motor Equipment Co., Ltd. is a research and development, production and sales and after-sales service as one of the professional technical enterprises. The company mainly produces: precision wire winding machine, multi-slot stator automatic winding machine, motor automatic winding machine, pump high-speed special winding machine, fan high-speed special winding machine, slotted rotor winding machine, slot paper machine and peripheral equipment and automatic assembly line, etc., widely used in medical, aviation, automobile, home appliances, power tools and other industries. Welcome friends to come to consult!