Electromagnetic actuator for active noise control for amorphous alloy transformers

Abstract

The invention discloses the field of active noise control and particularly relates to an electromagnetic actuator for active noise control for amorphous alloy transformers. The electromagnetic actuator comprises a support disposed on the surface of a transformer. The top and bottom of the support are provided with circular inner steps corresponding to each other. An upper spring plate and a lower spring plate are disposed on the two inner steps respectively. An upper moving core, permanent magnet steel and a lower moving core are disposed between the upper spring plate and the lower spring plate sequentially from top to bottom. The upper spring plate, the upper moving core, the permanent magnet steel, the lower moving core and the lower spring plate are serially connected through bolts and are fixed together through nuts at two ends of the bolts, an upper coil and a lower coil are wound outside the upper moving core and the lower moving core respectively. After serially connected oppositely, the upper coil and the lower coil are connected with a control power supply. The electromagnetic actuator is simple in structure, low in manufacturing cost, adjustable in mode, convenient and flexible to install and applicable to transformer denoising.

Description

Technical field [0001] The invention relates to an active noise control device, in particular to an active noise control device used as an actuator. Background technique [0002] Traditional acoustic measures to control noise mainly include sound absorption, sound insulation, and the use of mufflers. These methods are collectively referred to as "passive" noise control. Generally speaking, they are only effective for the control of medium and high frequency noise. In 1933, the German physicist Paul Leug (1898 ~ 1979) proposed a patent for "the process of eliminating sound oscillations", which created a precedent for active noise control (Active Noise Control) research. Active noise control technology is good at low-frequency noise control, and is highly complementary to passive noise control. Active noise control can be divided into active sound control and active force control. Active sound control uses a secondary sound source to generate a secondary sound field, thereby canc...

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Problems solved by technology

Therefore, it is necessary to further improve this type of electromagnetic actuator. In addition, the actuator has a fixed structure and a fixed mode. In noise control, it cannot adjust its own mode according to the mode of the controlled structure.

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