Many friends are asking, what is the difference between a brush motor and a brushless motor, in fact, it is not so complicated, probably from these aspects to distinguish, Vacuz briefly introduce it to you! Hope it can help you!

I. Control principle.

Brush motor does not need electric regulation to work, directly supply power to the motor can work, but can not control the speed of the motor.

Brushless motor must be electrically controlled, otherwise it can not rotate. DC power must be converted into three-phase AC power through brushless ESC, and then sent to the brushless motor can rotate.

In fact, the control of both motors is voltage regulation, just because the brushless DC motor uses electronic commutation, so only digital control can be achieved.

Brush D DC motors are commutated with carbon brushes, which can be controlled by traditional analog circuits such as thyristor, which is simpler.

Second, speed regulation mode

1. The speed regulation process of brush motor is to adjust the voltage of the motor power supply.

The adjusted voltage and current are converted through the commutator and brushes to change the strength of the magnetic field generated by the electrodes, thus changing the speed. This process is called variable voltage speed regulation.

2. The speed regulation process of brushless motor is the motor power supply voltage is constant.

Change the control signal of the electric control, and then change the switching rate of the high-power MOS tube through the microprocessor to realize the change of speed. This process is called frequency regulation.

Third, the performance difference

DC brush motor has simple structure, long development time and mature technology. Fast response, high starting torque, almost no vibration, and can drive a larger load when starting. Smooth running and good braking effect. High control precision. Low cost of use and easy maintenance.

DC brushless motor low interference, the brush is removed, the direct change is that there is no electric spark generated when running, which greatly reduces the interference of electric spark to remote radio equipment; low noise, smooth running; brushless motor without brush, friction is greatly reduced, smooth running, much lower noise. This advantage is a great support to the stability of model operation; long service life and low maintenance cost. Without brushes, the wear and tear of brushless motors is mainly on the bearings. From the mechanical point of view, brushless motors are almost maintenance-free motors. It’s good to do some dust removal maintenance if necessary.

About DC brush motor and DC brushless motor, the above is from the control principle, speed regulation, performance differences and other three aspects to analyze the difference between the two, I hope you can go deeper understanding.

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