What is the difference between a brushless motor and a brushed motor?

Brushless motors have emerged and quickly taken over the market, so what are the differences between brushless and brushed motors?

-Loss degree comparison

Brushless motor eliminates the brush, using electronic commutation technology, so brushless motor damage than brush motor is small, greatly eliminating the friction and electric loss of the motor, because there is no excitation winding on the rotor, so there is no electric loss, the magnetic field will not produce the corresponding iron loss in the rotor.

-Comparison of speed regulation methods

Brush motors change the voltage level through the transformation of the rotating coils and carbon brushes, thus changing the strength of the magnetic field generated by the electrodes and ultimately achieving speed regulation. Brushless motors, on the other hand, do not change the voltage, but are usually controlled by a digital frequency converter, which changes the AC into DC and then DC into AC, changing the AC voltage frequency to change the motor speed.

-Performance comparison

Brush motors are often used in conjunction with gearboxes and encoders, resulting in more accurate control of the motor and allowing the part to stop almost anywhere it wants. Brushless motors are not smooth when starting and braking and require limiters to do so.

-Noise comparison

Brushless motors are much quieter and run smoother because the brushes are removed and the friction is much reduced when running.


Due to the armature winding, the size of a brushed motor cannot be reduced, while the armature winding of a brushless motor is on the stator, making the brushless motor smaller and lighter than a brushed motor

-Heat dissipation comparison

When a brush motor is running, because the current is working on the motor’s internal resistance, part of the electrical energy is converted into heat, which tends to make the body hot, while the armature winding of a brushless motor is on the stator, directly connected to the housing, which greatly improves the heat dissipation effect and transfers heat faster.


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