How is a brushless DC motor driven, its working principle and characteristics
Time:2023-12-30
Views:410
With the rapid development of the motor industry, brushless DC motors have been widely used in various industries, and their prices are not as high as before. It can be said that they have largely replaced traditional brushed motors.
Brushless DC motors use electronic commutators instead of mechanical commutators, achieving dual benefits. This not only has the advantage of DC motor speed control performance, but also does not produce sparks, making it more suitable for a wider range of industries and easy to maintain. Currently, brushless DC motors are commonly used in the aerospace, new energy vehicles, smart devices, and household appliance industries, bringing us a lot of convenience and benefits in our production and daily life.
The above is the working principle and characteristics of brushless DC motor drive. Overall, brushless DC motor has advantages and is widely used now, with great potential for the future.
Working principle of brushless DC motor drive:
In fact, to understand the working principle of brushless DC motors, one must first understand it, and it is not that complicated. The rotor serves as a permanent magnet and the stator serves as a coil winding. If a fixed current is applied to a DC brushless motor, it can only generate a fixed magnetic field and the motor will not rotate. So how can this problem be solved? It is necessary to apply different corresponding current sizes according to the position of the rotor, so that the motor stator can generate a rotating magnetic field with uniform changes in direction. In this case, the brushless motor will operate.
Simply put, the working principle of brushless DC motor drive is to continuously detect the position of the rotor, apply electricity to each phase as required, and generate a magnetic field in the stator, with continuous and uniform changes in direction.
Characteristics of brushless DC motors:
1.The speed range of brushless DC motors is relatively wide, and they can operate at full power at any speed.
2. Outstanding overload capacity and high operating efficiency.
3. Compared to brushless motors, brushless DC motors have a smaller volume, wider application range, and higher power density.
4.Compared with the drive control of asynchronous motors, the drive is more simplified.
5. Brushless DC motors do not have a mechanical commutator structure and are enclosed inside to prevent flying dust particles from entering the motor, resulting in various problems and high reliability.
6. It has good external characteristics, operates at low speed, can output large torque, and can provide relatively large starting torque.
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