Dual-frequency resonance driving vibration absorber small in mass and low in power consumption

Abstract

The invention provides a dual-frequency resonance driving vibration absorber small in mass and low in power consumption. The dual-frequency resonance driving vibration absorber comprises a sinusoidal signal generator and a two-degree-of-freedom electromagnetic vibration absorber, wherein the sinusoidal signal generator transmits sinusoidal signals corresponding to a current motor rotation speed frequency to the two-degree-of-freedom electromagnetic vibration absorber. The two-degree-of-freedom electromagnetic vibration absorber comprises a lower spring, a lower mass block, exciting coils, coil retainers, a middle spring, an upper mass block, an upper spring, a shaft and a support mechanism. The shaft is arranged in the support mechanism, the lower spring, the lower mass block, the middle spring, the upper mass block and the upper spring are sequentially sleeved on the shaft from the bottom to top and capable of vertically moving along the shaft, the coil retainers are fixedly connected to a bottom plate of the support mechanism and surround outside lower magnetism-permeable yokes, the exciting coils are wound on the coil retainers and arranged in a magnetic loop formed by the lower mass block and are connected with the sinusoidal signal generator. The dual-frequency resonance driving vibration absorber is capable of effectively suppressing structural vibration caused by a motor under the variable working conditions of a dual-speed motor.

Description

technical field [0001] The invention belongs to the technical field of equipment vibration and noise control, in particular to a dual-frequency, small-mass, low-power-consumption resonant active vibration absorber. Background technique [0002] With the further development of asynchronous motor multi-pole speed regulation technology, a low-speed high-efficiency two-speed motor has been developed on the market, which can increase the flexibility of the motor under different working conditions, and also reduce the vibration caused by it to a certain extent. Noise, but from the analysis of the vibration spectrum of the motor, it can be seen that its low frequency band shows obvious strong line spectrum vibration characteristics, and it is of great significance to take effective suppression measures to reduce the vibration caused by it. [0003] Installing a dynamic vibration absorber is a feasible method to suppress single-frequency vibration of mechanical equipment. The princi...

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Problems solved by technology

[0004] For the variable speed condition of the two-speed motor, the traditional single dynamic vibration absorber is no longer suitable, and a vibration absorber that can effectively reduce the vibration caused by the motor under two-speed conditions is needed

At the same time, the traditional vibration absorber is composed of a mass spring system. In order to achieve the best vibration absorption effect, the vibration absorber needs to have a mass ratio of 0.1 to 0.2, which increases the overall weight of the system.

[0005] Therefore, in order to effectively reduce the low-frequency vibration caused by the two-speed motor and reduce the quality of the vibration absorber, an active vibration absorber that can track the speed of the two-speed motor and achieve a good control effect with a small mass ratio and power consumption is needed , the current domestic shock absorbers are still unable to meet the above requirements

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