What is the difference between a brushless motor and a brushed motor? Which is more advantageous? How is the stator and rotor wound? Many friends are still not clear, the following Vacuz to analyze it! I hope it can help you!

BLDC kefe nélküli egyenáramú motor

The main difference between brushless motors and brushed motors is whether they use brushes for commutation. Brushless motors use position sensors to realize commutation without the use of brushes.

Brushless motors offer the following advantages.

Efficiency: Brushless motors are designed to eliminate brushes, thereby reducing friction and wear and improving operating efficiency.

Reliability: Because there are no brushes to wear out, brushless motors have a relatively longer life, reducing the need for maintenance and brush replacement, and lowering the failure rate.

Quiet: Brushless motors operate with relatively low noise levels, making them ideal for applications that require a quiet environment.

Energy efficient: Brushless motors save energy over the long term due to their higher efficiency.

The stator and rotor winding method of a brushless motor is as follows.

The stator usually consists of 3 sets of coils, each labeled by ABC. When 1 set of coils of the stator is energized, that set of coils will generate a magnetic field. Brushless DC motors rotate and work by the interaction of the permanent magnetic field of the rotor and the electromagnetic field of the stator. When the rotation of the rotor is nearing completion, the current in A is cut off and power is supplied to coil B, allowing the rotor to continue to rotate. And so on. As the rotor continues to rotate to A, it should be noted that a reverse current must be passed to coil a in order to allow the rotor to continue to rotate. The electromagnetic field generated in this manner permits the rotor to continue to rotate. In this manner, the motor is rotated by sequentially exciting the stator. Sensors inside the brushless motor provide real-time feedback to the controller on the state of the rotor.

In contrast, brushed motors use brushes for commutation and have a different structure and operating principle than brushless motors. The rotor of a brushed motor usually consists of a coil and a magnet, while the stator consists of an iron core and brushes. When current passes through the stator coil, the magnetic field is excited, which attracts the rotor to rotate. At the same time, the brushes can contact the rotor’s coils, thus transferring current to the rotor, which drives the motor to rotate.

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Overall, brushless motors are advantageous in many ways, especially in terms of efficiency, reliability and quietness. However, the exact type of motor to choose depends on the specific application needs and requirements. For some specific application scenarios, brushed motors may be more suitable or economical. When selecting a motor, factors such as motor performance, operating environment, maintenance requirements and cost need to be considered.

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