The advantages of brushless motor speed regulation.

The advantages of brushless motor speed regulation.

In the application of automation equipment, load speed regulation is a common topic In traditional applications, for situations where high speed regulation accuracy is required, AC servo motors are generally used to achieve it In some low-speed situations, using a stepper motor for speed regulation is also a good option However, with the development of brushless DC technology, brushless motor speed regulation has become a trend to replace servo motors and stepper motors, mainly due to the following reasons

1. Although DC brushless motors do not have a code wheel and only have three Hall sensors as feedback, with the development of FOC control technology, the speed variation rate of DC brushless motors under load can now reach a level below 0.5%. In terms of speed adjustment accuracy, it is close to the level of servo motors;

2. The speed control unit formed by the combination of a brushless DC motor and a brushless DC motor driver has a cost advantage of only about half that of a servo motor, and has a natural cost-effectiveness advantage;

3. With the development of control technology, more control functions than servo motors have been added to brushless motor speed control systems, providing customers with more technical support and lower costs in their applications;

4. Compared with traditional AC variable frequency speed regulation, brushless motor speed regulation has high accuracy, small unit size, multiple control methods, including analog quantity, frequency speed regulation, pulse width speed regulation, bus control and other methods. At the same time, the speed ratio range is much higher than that of the combination of AC motor and frequency converter. However, currently brushless speed regulation is still limited to a smaller power range, mainly because the production of DC brushless motors is still dominated by low power, and DC brushless motors with several kilowatts or more are already considered large At least that's the current situation in China.