Electric eddy-current damping device for rotary machine rotor

Abstract

The electric eddy current damper of mechanical rotor operates on the principle that conductor moving in magnetic field will generate electric eddy current force proportional directly to the speed of the moving conductor. It includes mainly ring magnet and ring conductor coaxially on the rotor. Around the ring magnet surface, there is winding with some interval in between, and one of the ring magnet and the winding is fixed to the casing for producing non-rotation relative motion. When some current flows through the winding, a ring magnetic field will be established in the interval between the ring magnet and the ring conductor, and the object moving in the magnetic field will produce a damping force proportional to the motion speed to reduce vibration of the rotor system and raise the stability of the rotor system. Being simple and convenient, the electric eddy current damper may be applied in various kinds of mechanical rotor systems.

Description

technical field [0001] The invention relates to a damping device for a rotary machine rotor, in particular to an eddy current damping device for a rotary machine rotor. Background technique [0002] Rotary machinery is one of the key equipment of modern large-scale industry, and the high-speed rotating rotor is its core component. The vibration and stability of the rotor system have always been an important factor that confuses engineers and hinders product performance, reliability and service life. Therefore, it is of great significance to reduce the vibration of the rotor system and improve the stability of the system. [0003] For high-speed rotors supported on rolling bearings or sliding bearings, due to external interference or self-excitation, when the damping of the rotor system is insufficient, not only large vibrations but also instability will occur. In order to add necessary damping to the rotor system, elastic Damping support structure. The elastic damping sup...

AI Technical Summary

Problems solved by technology

However, the electromagnetic bearing needs to add an iron core to the rotating shaft, which greatly limits its maximum operating speed, and the volume and weight of the electromagnetic bearing are also relatively large; in addition, the electromagnetic bearing requires a complex controller and a high-power amplifier, so the current The peripherals of electromagnetic bearings or electromagnetic dampers are large, the cost is high, and the reliability of the system is low, especially many problems in active control have not been clearly understood

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