Application of Numerical Control Technology in Magnetic Bearings

At present, the variety of CNC machine tools has been basically complete, and the specifications are numerous. According to incomplete statistics, there are more than 400 varieties of specifications. Classification can be done according to a variety of principles. But in summary, the common four are classified by the following four methods. This article describes the main magnetic levitation

At present, the variety of CNC machine tools has been basically complete, and the specifications are numerous. According to incomplete statistics, there are more than 400 varieties of specifications. Classification can be done according to a variety of principles. But in summary, the common four are classified by the following four methods.

This paper introduces the composition and working principle of the magnetic suspension spindle system, and proposes a new digital controller design of the intelligent PID controller based on the conventional PID. The core component is TI's TMS320LF2407A, which is designed with a hardware block diagram of the five-degree-of-freedom magnetic suspension spindle system. Using the C2000 as a development platform, the intelligent PID controller based on the conventional PID is designed. The theoretical analysis results show that this intelligent PID controller can achieve better control effects and achieve higher control accuracy requirements.

Active magnetic suspension bearings (AMB, hereinafter referred to as magnetic bearings) are a collection of many disciplines, which best reflect the mechatronics products. Compared with traditional bearings, magnetic suspension bearings have the following advantages: no contact, no friction, high speed, high precision. After the traditional bearing is used for a long time, the wear is serious and must be replaced. The service life of the oil-lubricated bearing will be prolonged, but the oil leakage will inevitably occur after a long time, which has an impact on the environment. This can be avoided for the magnetic suspension bearing. It can be said that it is an environmentally friendly product. Moreover, magnetic bearings not only have research significance, but also have a wide application space: aerospace, transportation, medical, mechanical processing and other fields. There are many application examples in foreign countries.

The magnetic suspension bearing system consists of five parts: controller, rotor, electromagnet, sensor and power amplifier. The most critical component is the controller. The performance of the controller basically determines the performance of the entire magnetic suspension bearing system. The control law of the controller determines the dynamic performance of the magnetic bearing system as well as stiffness, damping and stability. There are two types of controllers: analog controllers and digital controllers. Although the analog controller widely used in China satisfies the stability of the system to a certain extent, the analog controller has the following disadvantages compared with the digital controller: (1) the adjustment is inconvenient, and (2) it is difficult to implement complex control. (3) It is impossible to realize the control of two or more degrees of freedom at the same time, and (4) the interchangeability is poor, that is, different magnetic suspension bearings must have corresponding controllers, (5) large power consumption, large volume, and the like. Magnetic bearings have to be widely used, and the on-line adjustment performance of analog controllers cannot be said to be one of the reasons. Therefore, the digital direction is the development trend of magnetic bearings. At the same time, in order to realize the intelligentization of the magnetic bearing system, it is obvious that the analog controller is difficult to meet the requirements in this respect. Therefore, from the perspective of improving the performance and reliability of the magnetic bearing, enhancing the flexibility of the controller, reducing the volume, power consumption, and the future development of networking and intelligence, it is necessary to realize the digitization of the controller.

In the past three decades, control theory has developed rapidly and has been widely used. The research on the control law of magnetic suspension bearing controller has made remarkable progress in recent years. At present, the control laws involved in foreign countries include: conventional PID and PD control, adaptive control, H∞ control, etc. The main control laws involved in China are mainly It is a conventional PID and PD control and H∞ control, but the relevant information that H∞ control has been successfully applied to the magnetic suspension bearing system has not been reported.

Judging from the current development situation at home and abroad, foreign research status and productization are leading domestically for many years. Foreign magnetic suspension bearing companies and magnetic levitation research centers have been engaged in R&D and application in this field, such as SKF and NASA. The control law of the magnetic bearing controller of SKF company is adaptive control. The applicable range of the product is 50~2500N, the speed is 1,800~100,000r/min, and the working temperature is lower than 220°C. NASA is NASA. They have been conducting magnetic levitation research for decades. They are mainly used in aerospace. The research field includes rocket engines and magnetic levitation orbital propulsion systems. (In September 2002, the rocket was completed with 2g acceleration on the magnetic levitation orbit. The initial launch speed has reached 643-965km/h. At present, there is no magnetic suspension bearing company in China. To catch up with the development level of foreign magnetic suspension bearings, we must increase investment in manpower and material resources.

Domestic research on the control law of magnetic suspension bearing controllers started late. Most of the current use is conventional PID and PD control, and PIDD is also used in actual circuits. The control accuracy is relatively low, and each system must correspond to the corresponding KP, KI, KD. It is very troublesome to adjust, and the user will feel very inconvenient. In order to make the magnetic suspension bearing product, it is necessary to solve the above problem, and anyone can use it easily. It must be made into a product like a fool-type device, and this must first solve the problem of the controller. Solving this problem is to make the controller intelligent. Intelligent content includes hardware intelligence and software intelligence.

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Dongguan C.Y. RedApple Industrial Limited , https://www.redapplebags.com