Brushless motor has no carbon brush. It is driven by circuit and has design chip and program design. In the field of automation, brushless motor does not need encoder. Brushless motor senses the rotation of the motor through induction Honeywell and echoes the induction signal to the control chip.

Strictly speaking, brushless motor includes servo motor, stepping motor and general brushless motor. In practical application, the brushless motor we usually refer to is an ordinary brushless motor. Due to the high price of servo and stepping, it can only be used in the field of automation and cannot be used in daily fields.

The difference between brush motor and brushless motor:

1. Brush motor

It uses the carbon brush as the two contacts of the motor power supply, uses the speed regulating handle and the controller to control, and achieves the stepless speed regulation of the electric bicycle of 0-20 km / h through the secondary deceleration of the gear and the overrunning clutch. The current brush high-speed motor has high gold content, strong motor reduction gear strength, good wear resistance and reasonable design, so the repair rate is low; Moreover, the cost of repairing and replacing gears and motors is less, which effectively reduces the maintenance cost of electric bicycles; And the brush motor can achieve easy human riding by overriding the clutch and flywheel. Brush motor adopts brush mechanical commutation!

2. Brushless motor

The cost of its speed control system is higher than that of brush high-speed motor, and the controller is prone to failure in use. Electric bicycles equipped with brushless motors must run at a speed of more than 35 km / h in order to give full play to their best work efficiency. However, we know that electric bicycles are managed as non motor vehicles, and the speed must be less than 20 km / h. therefore, the selection of brushless motors by electric bicycles reduces the work efficiency and is not highly desirable. The main point that it is adopted now is its low noise. Brushless motor uses electronic circuit commutation! There are detection elements to detect the polarity!

Here are the differences between brush motor and brushless motor from several aspects:

1. Scope of application:

Brushless motor equipment can be used in dairy industry, brewing industry, meat processing industry, bean processing industry, beverage processing industry, pastry processing industry, pharmaceutical industry, electronic precision factory, and other dust-free workshops with higher requirements. For example, the brushless motor (dihour) hand dryer produced by Dior electric appliance is widely used in factories.

Carbon brush motor: it can only be used in all kinds of toilets and other areas where the requirements are not too high, while dust-free workshops and explosion-proof workshops cannot be used!

2. Service life:

Brushless motor: it can work continuously for about 20000 hours, with a conventional service life of 7-10 years.

Carbon brush motor: it can work continuously for about 1000-5000 hours, with a conventional service life of 1-2 years.

3. Use effect:

Brushless motor: operate at a high speed of 90-95m/s, and the actual effect can reach a dry hand time of 5-7s.

Carbon brush motor: the running speed and hand drying time are much lower than that of brushless motor.

4. Energy saving:

Relatively speaking, the power consumption of brushless motor is only 1/3 of that of carbon brush.

5. Future maintenance

After the carbon brush motor is worn, not only the carbon brush, but also the accessories around the motor, such as the rotating teeth, are replaced, and the cost is much higher. Most importantly, the overall function will be affected.

6. Noise and service life

The noise emitted by the brush motor is much higher than that of the brushless motor, and with the wear of the carbon brush in the future, the noise of the brush motor will become larger and larger, and the brushless motor will not be affected.