Since the 1970s, increased-safety brushless synchronous motors have experienced rapid development and widespread application, while brushless synchronous generators predate motors. Starting in the 1980s, with industrial development, the demand for high-power single-unit drive devices increased across various industries. In particular, the motors used in industries such as petroleum, chemical, energy, steel, and building materials not only saw increased single-unit power and speed, but also, with the development and application of AC variable frequency speed control technology, AC variable frequency speed control brushless synchronous motors have been widely used, representing a new development trend.
It is worth mentioning that traditional high-speed, high-power mechanical equipment and testing equipment driven by steam turbines have now been replaced by variable frequency speed-regulating brushless excitation synchronous motors. In addition, due to the rapid expansion of the market for gas centrifugal compressors配套 with gas combined cycle power generation projects, i.e. the development of large-capacity gas turbines, the demand for air-cooled brushless excitation synchronous generators配套 with gas turbines and safety-enhanced brushless excitation synchronous motors, variable frequency speed control devices and control system equipment配套 with gas centrifugal compressors has increased significantly.
Modern power electronic variable frequency speed control technology has driven the great development of electric motors.
While pursuing high efficiency, safe and reliable operation, and high-quality equipment products, modern industrial complete sets of equipment are increasingly seeking to meet the demands of energy conservation, emission reduction, and savings in maintenance costs and time, leading to more diversified development goals. One of the core driving forces supporting this development is the advancement of modern power electronic variable frequency speed control technology.
Modern increased-safety brushless synchronous motor variable frequency speed control system, also known as AC variable frequency speed control vector control technology, is a new technology that emerged in the late 1970s and early 1980s with the advancement of power electronic semiconductor devices. In electric drive control systems, compared to DC drives, it utilizes vector control technology, fully digital automated industrial control, and electronic computer automatic control to achieve four-quadrant operation. This allows its speed control performance to rival that of DC speed control, while offering unique advantages such as energy saving, advanced performance, high production efficiency, and easier use and maintenance. Currently, variable frequency speed control systems have rapidly replaced DC speed control systems worldwide.
The core elements of variable frequency speed control drive devices, which are widely used in modern industrial enterprises, are the application of AC motor variable frequency speed control, micro-industrial control electronic computer control systems, industrial operation information processing, and the formation of a new field of drive control power electronics discipline, which consists of sensor element signal feedback and alarm display. Therefore, the progress and development of modern motor-power electronic control integrated variable speed drive technology has become the most basic and important technical requirement for modern industrial enterprises.
The development of modern AC drive technology has led to the widespread application of AC-AC variable frequency speed control systems for high-voltage, high-power AC motors above 2000kW, which are superior to DC motor drive systems. The demand for AC drives is constantly increasing, and they are demonstrating their superior operating performance in driving various mechanical equipment in modern industry, including high efficiency, energy saving, safety, and reliability.
AC drives can not only achieve the necessary speed characteristics for the load machinery, but will also improve the power and speed characteristics of AC drives themselves, thereby enabling the development of load machinery or complete equipment systems that meet their requirements. At the same time, the load machinery and drive motors will influence each other and achieve further rapid development.
Based on the current actual use of high-voltage frequency converters in my country, the average energy saving can reach 30%. Therefore, the economic benefits of energy saving and consumption reduction from the investment and widespread application of frequency conversion speed control systems are self-evident.
Increased safety brushless synchronous motors, with their excellent operating characteristics of adjusting power factor and stabilizing torque, are particularly advantageous in the field of electrical drives for flammable and explosive environments, making them the preferred choice for driving large hydrogen compressors and dust collection fans. They are widely used in modern petroleum and chemical industries.
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