HC5440 Automatic Driller Motor，Why do electric tools, such as electric drills, have a brush motor? DC brush motor: quick start, timely braking, stable speed regulation, simple control, simple structure, cheap price. The point is that the price is cheap, and it has a high starting current, a high torque (rotation) at low speeds, and can carry a heavy load. However, due to the friction between the carbon brush and the reversing plate, so the DC brush motor is easy to produce spark, heat, noise, electromagnetic interference to the external environment, and low efficiency, short life. Because the carbon brush belongs to the loss of goods, easy to failure, and with a period of time need to replace. With brush motor only needs carbon brush and commutator this mechanical method to help the motor rotate, and brushless motor needs an additional electronic governor to accurately control, relatively cost, carbon brush is much lower than the electronic controller. The advantages of brushless motor are higher speed, longer service life, low running noise and small volume. Because there is no carbon brush as a commutator, so there is almost no wear, the disadvantage is the high price, maintenance is difficult. A brush motor is cheap, easy to repair. As long as the coil is not burned, you can use a new carbon brush. The disadvantage is that the carbon brush is easy to wear, running noise, the volume is relatively large, not as smooth as the brushless motor rotation.
