Brushed motor concept
When the motor is working, the coil and the commutator rotate, the magnetic steel and the carbon brush do not rotate, and the alternating change of the coil current direction is completed by the commutator and the brush that rotate with the motor. The industry has brush motor divided into high speed brush motor and low speed brush motor. There are many differences between brushed and brushless motors. From the name, it can be seen that the brush motor has a carbon brush, and the brushless motor has no carbon brush.
Brushless motor concept
The brushless DC motor consists of a motor body andWashing machine wash motors a driver, and is a typical mechatronic product. Since the brushless DC motor is operated in a self-controlled manner, it does not add a start winding to the rotor like the synchronous motor with heavy-duty starting under variable frequency speed regulation, and it does not cause oscillation and out-of-step when the load is abrupt.
From the perspective of the product market: brushed motors are traditional products with relatively stable performance. Brushless motors are upgraded products that have better life performance than brushed motors. However, its control circuit is more complicated, and the aging screening requirements for components are more stringent. Although the motor has a long life, the control circuit is prone to problems. Therefore, brushless motors are subjected to rigorous reliability tests to ensure quality.
In principle, the brush motor means that the motor is a DC input, and the controller that controls it can only provide speed by providing it with a large current. The brushless motor is actually a three-phase AC motor, and the DC power is converted by the controller. It is a three-phase alternating current and is commutated according to the sensor Hall element in the motor to make the motor run normally. Directly speaking, the brushless motor has a longer life than the brushed motor, and the power is saved at the start, but the controller is more expensive than the brush controller.
