07
2022
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07
What are the advantages and disadvantages of flexible packaging composite bags
Brushless motors are more expensive than AC motors in terms of construction, price, and maintenance performance. However, for a long time, the problem of AC motor drive control has not been well solved, so the brushless motor has been widely used for its good control performance. At present, although the speed control problem of the AC motor has been solved, it needs a long process for casting equipment and modification. Speed control of AC motors is not yet widespread, and brushless motor systems are still widely used.
The brushless motor speed control system uses a constant DC voltage to power the brushless motor. First, the speed change is achieved in the armature circuit by changing the resistance. The method is simple, easy to realize, easy to manufacture, and low cost, but the disadvantage is that the efficiency is low, the mechanical properties are soft, and the wide and smooth speed regulation performance cannot be obtained. This method is only suitable for occasions with small power and variable speed range. Another method can obtain wider speed regulation range, low speed change rate and smooth speed regulation performance. But the main disadvantage of this method is the heavy weight, large area, low efficiency and difficult maintenance of the drive system.
In recent years, with the rapid development of power electronic technology, the brushless motor speed control system powered by thyristor converter has been replaced by the power electronic technology speed control system, and its speed performance is far more than that of generators and motors. speed control system. Especially with the rapid development of large-scale integrated circuit technology and computer technology, the precision, dynamic performance and reliability of the brushless motor speed control system have been greatly improved. Power electronic technologies such as high-power devices are replacing the development of thyristors, and there will be a better performance brushless motor speed control system in the near future.
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