Electromagnet-permanent magnet mixed type online active balance head structure for rotary machine and control method thereof

Abstract

The invention discloses an electromagnet-permanent magnet mixed type online active balance head structure for a rotary machine and a control method thereof. The balance head structure consists of two parts, namely drivers and actuators, wherein the drivers comprise coils, iron cores, magnetoresistive adjusting rings and the like; and the actuators comprise weight discs, magnetic discs, permanent magnets, bearings, magnetism isolating rings, base bodies, end covers and the like. When the machine needs dynamic balance, positive and negative pulse voltages are applied to the two ends of the coils in turn, the weight discs are driven to rotate at a certain angle to form unbalance vectors; the unbalance vectors of the two weight discs in the drivers are synthesized into an effective correction vector, so as to offset the unbalance of the rotary machine; when the dynamic balance is not needed, the weight discs and the magnetic discs at the two sides are at the positions with lowest magnetic resistance to realize self locking of the weight discs; and at the moment, the weight discs rotate together with a shaft of the rotary machine. The balance head disclosed by the invention has the characteristics of simple structure, easy assembly, no contact, no friction, fast response, low cost, diversified weight forms, wider balanced capacity range and application in emergent speed-change working conditions. By adoption of the balance head designed by the invention, unbalance of the rotary machine with high-speed rotation can be corrected online in real time, so that the vibration level of the machine is reduced, the operating quality and the operating efficiency of the machine are improved, and the service life of the machine is prolonged.

Description

Technical field: [0001] The invention belongs to the field of dynamic balance of rotating machinery, and relates to a structure of an online active balancing head and a control method thereof, in particular to a structure of a mixed magnetic online active (that is, active) balancing head based on "electromagnetic + permanent magnet" and its Control Method. Background technique: [0002] Unbalance is the main cause of vibration during operation of various rotating machinery, which leads to damage or life reduction. There are many factors that induce unbalance, which run through the entire life cycle of rotating machinery, including structural design, processing and manufacturing, assembly and installation, commissioning and maintenance, and environmental interference. [0003] Dynamic balance is the most important means of suppressing unbalanced vibration, and has been highly valued by industry and academia. Tracing back to the development history of dynamic balance, dynami...

AI Technical Summary

Problems solved by technology

According to the checked patents and papers, most of the existing domestic electromagnetic balance heads are made of the principle of imitating the motor, and the balance plate is self-locked by adding a clutch, which makes the structure of the balance head complex, the axial size is large, and the impact is introduced. , which is not conducive to improving the applicable speed and accuracy of online dynamic balancing

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