The difference between brushed motor and brushless motor

　　The difference between a brushed motor and a brushless motor, whether it is equipped with ordinary brushes and commutators, the scope of use, the service life, the effect, and energy saving.

　　A brushed motor is a rotating electrical machine that contains a brush device, which converts electrical energy into mechanical energy (motor) or mechanical energy into electrical energy (generator). The large-scale speed regulation is stable and the control circuit is relatively simple. The commutation of the brushed DC motor is always achieved by the contact between the graphite brush and the annular commutator on the rotor, while the brushless DC motor feedbacks the rotor position to the control circuit through the Hall sensor, so that it knows the commutation of the motor. accurate time.

　　The brushed motor is selected by most domestic electric bicycle manufacturers. It uses carbon brushes as the two contacts of the motor power supply . It is controlled by the speed control handle and the controller, and realizes the electric bicycle 0-20km/h through the secondary deceleration of the gear and the overrunning clutch. stepless speed regulation. The brushed high-speed motor adopts high gold content, high strength of the motor reduction gear, good wear resistance, and reasonable design, so the repair rate is low; and the cost of repairing and replacing gears and motors is less, which effectively reduces the maintenance cost of electric bicycles; The motor allows for easy manual riding with an overrunning clutch and flywheel. Brushed motors use brushed mechanical commutation.

　　Brushless Motor Electric bicycles with brushless motors must travel at a speed of more than 35 kilometers per hour to play the best work efficiency, but we know that electric bicycles are managed as non-motor vehicles, and the speed must be below 20 kilometers per hour, Therefore, choosing a brushless motor for an electric bicycle reduces the work efficiency and is not very desirable. The point of its use is low noise. Brushless motors are commutated using electronic circuits. There are also detection elements that detect polarity.

　　The functional difference between brushless motor and brushed motor:

　　1. When the brushed motor motor is working, the coil and the commutator rotate, but the magnetic steel and the carbon brush do not rotate. The alternating change of the current direction of the coil is completed by the commutator and the brush that rotates with the motor.

　　2. The brushed motor is a traditional product with relatively stable performance. The brushless motor is an upgraded product, and its life performance is better than that of the brushed motor. However, its control circuit is more complex, and the requirements for the aging screening of components are relatively strict.

　　3. The brushless DC motor is composed of the main body of the motor and the driver, and is a typical mechatronic product. Because the brushless DC motor runs in a self-controlled manner, it will not add a starting winding to the rotor like a synchronous motor with heavy-load starting under variable frequency speed regulation, nor will it cause oscillation and loss of step when the load changes abruptly.

　　4. The brushless motor equipment can be used in: dairy product industry, brewing industry, meat product processing industry, soy product processing industry, beverage processing industry, cake processing industry, pharmaceutical industry, electronic precision factory, etc. Dust workshops, etc., such as the brushless motor (DIHOUR) hand dryer produced by Dior Electric, are widely used in factories.

　　5. Carbon brush motors can only be used in areas where the requirements are not too high, such as various toilets, and cannot be used in dust-free workshops and explosion-proof workshops!

　　6. Service life, the brushless motor can work continuously for about 20,000 hours, and the conventional service life is 7-10 years. Carbon brush motor: It can work continuously for about 5000 hours, and the normal service life is 2-3 years.

　　7. In terms of energy saving, relatively speaking, the power consumption of brushless motors is only 1/3 of that of carbon brushes.

　　Brushed electric drill means that the electric drill's motor uses a carbon brush to contact the rectifier copper sheet on the stator to supply power to the coil of the motor rotor and cooperate with the stator to form a rotating magnetic field, which drives the rotor to rotate to form the drill bit.

　　Brushless electric drill means that the electric drill uses a brushless motor. The so-called brushless motor is because the rotor of the motor does not use a coil that generates a magnetic field, but uses a magnet instead of the rotor winding to cooperate with the stator winding to generate a rotating magnetic field and electromagnetic torque to drive the drill bit.