초록 ▼

An electromagnetic active vibration actuator configuration combines two modes of operation to obtain the advantages of long stroke and linearity of voice coil type actuators and high efficiency of dual-gap solenoid type actuators. A coaxial stator shell surrounds an axially vibratable armature. Eith

An electromagnetic active vibration actuator configuration combines two modes of operation to obtain the advantages of long stroke and linearity of voice coil type actuators and high efficiency of dual-gap solenoid type actuators. A coaxial stator shell surrounds an axially vibratable armature. Either the stator or the armature can carry one or more coils and/or permanent magnets, however usually the magnets are located on the armature for their contribution to vibrating mass. Alternate coils and alternate magnets are made opposite in polarity, the stator armature pole pieces being held symmetrically staggered relative to the stator pole pieces by end springs or flexures that allow axial vibration when AC is applied to the coils. Two different types of flux loop paths are associated with each pair of permanent magnet prominent poles: a voice-coil-effect flux loop path including two air gaps, each traversing a coil, that remain relatively constant in separation distance and permeability under vibration, and a solenoid-effect loop flux path traversing a pair of gaps in series flanking a coil prominent pole, that vary in separation distance and permeability in a complementary manner under vibration in the manner of a solenoid type actuator. These two magnetic modes operate in a cooperative additive efficient manner. Multiples of a typical magnet/coil pair can be easily tandemed using common building block component elements, typically being made to have in total an odd number of prominent poles. Wide flexibility is provided in design and manufacture to customize the performance of the actuator by manipulating the proportion of voice coil effect and solenoid effect along with the mechanical spring effect and the vibrating mass.

대표청구항 ▼

[ What is claimed is:] [1.] An electromagnetic force actuator, for active vibration control, motivated in a dual magnetic manner by a combination of voice-coil-effect and solenoid-effect flux paths, comprising;an electromagnetic coil structure of magnetically permeable material constructed and arran

[ What is claimed is:] [1.] An electromagnetic force actuator, for active vibration control, motivated in a dual magnetic manner by a combination of voice-coil-effect and solenoid-effect flux paths, comprising;an electromagnetic coil structure of magnetically permeable material constructed and arranged to have a typical cross-sectional shape defining at least one prominent pole facing a common reference line at a predetermined spacing distance and separating two of a plurality of adjacent channels formed in the magnetically permeable material each filled with an oppositely polarized coil winding oriented such that wire ends appear in the cross-sectional shape;a magnet structure having at least one permanent magnet with a pair of magnetically opposed prominent poles of magnetically permeable material having a cross sectional shape such as to face the common reference line from a direction opposite the coil structure, disposed along the common reference line such that the prominent pole(s) of the coil structure and those of the magnet structure are located in a staggered symmetric disposition about the common reference line so as to be mutually centered axially;suspension means constructed and arranged to retain the coil structure and the magnet structure facing the common reference line at a constant distance therefrom while providing freedom for the electromagnetic coil structure and the magnet structure to vibrate relative to each other in an axial direction along the common reference line:magnetic flux path conducting means, including magnetically permeable material, for conducting magnetic flux, configured and arranged to conduct portions of magnetic flux paths extending from a first prominent pole of each magnet through a path to a second and opposite prominent pole thereof, the flux paths including (1) a voice-coil-effect flux path that traverses first and second air gaps serially, each gap being made to have substantially constant separation distance under vibration and each containing respectively a central portion of a first and second one of two adjacent ones of said oppositely polarized coil windings, and (2) a solenoid-effect flux path that traverses serially (a) a first air gap containing an end portion of the first coil winding, (b) a prominent pole of the coil structure that is axially movable with respect to the magnet poles, and (c) a second air gap containing an end portion of the second coil winding; the first and second air gaps being constructed and arranged to have respective separation spacings and permeabilities that vary with vibration in a complementary manner;said actuator being made to have an odd total number of prominent poles and thus to have at least three prominent poles; adjacent magnets being oppositely polarized and adjacent coils being oppositely polarized; andspring means constructed and arranged to provide a spring force tending to establish and maintain the mutually centered relationship between each prominent pole of the coil structure and corresponding prominent poles of the magnet structure;whereby, in response to alternating current applied to the coil windings, at least one of said structures is caused to vibrate relative to the other, operating in first part according to principles of a voice coil type actuator due to e.m.f. of the voice-coil-effect flux path having substantially constant permeability and acting directly on the said oppositely polarized coil windings as a force in an axial direction, and operating in second part according to principles of a dual-gap solenoid type actuator in the solenoid-effect flux path due to magnetic attraction forces typically between a stator prominent pole and an adjacent movable armature prominent pole, with recurrent complementary flux redistribution in the two air gaps from the complementary variation of respective gap separation distances and permeabilities under vibration.