What is the difference between brushless DC motors and brushed motors? Analysis of motor equipment manufacturers

In our production life, motors are everywhere, such as various electrical appliances, power tools, cars, agricultural equipment, etc. Whether brushed, or brushless, motors have filled our lives and brought us a lot of convenience.

Many friends are more curious about the motor, often heard brushless motor and brush motor, but has been confused about what the difference between the two, the following Hongke simple to introduce it to you! Hope it can help you!

Brushless DC motors use electronic commutation, no commutator and carbon brushes, but the use of position sensors, mainly by the permanent magnet rotor, multi-pole winding stator and position sensors.

Brush motors use mechanical commutation, the outer pole does not move, the inner coil moves. When the motor works, the commutator and the coil rotate together.

The difference between brush motor and brushless motor except carbon brushes, brush motor is controlled by gears, which will increase the return rate of the motor; while brushless motor does not need gears and will not be maintained frequently, so it has longer service life and higher reliability. However, the control system cost of brushless motor will be higher than brush motor. In addition, brush motors are noisier, while brushless motors are much quieter and will work more efficiently.

Brush outside also need an electronic governor. This governor is motor-driven and changes the direction of the current inside the fixed coil at any time to ensure that the force between it and the permanent magnet is mutually exclusive and can rotate continuously. Brush motors do not need electric regulation to work, they can work by supplying power directly to the motor, but they cannot control the speed of the motor. Brushless motors must be electrically controlled, otherwise they cannot rotate. DC power must be converted to three-phase AC power by brushless ESC, and then the brushless motor can rotate.

The brushless motor removes the brush, the direct change is that there is no electric spark generated when the brushless motor is running, which greatly reduces the interference of electric spark to the remote control radio equipment.

In summary, brushless DC motors have more advantages over brushed motors, but it can not be said to replace, in many areas, brushed motors are still used, and then the brushless motor is relatively expensive, so in the future for a long time, the two still coexist.

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