Electrical generator or motor structure – Dynamoelectric – Reciprocating
Patent
1994-07-08
1995-08-22
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Reciprocating
310 15, H02K 3306
Patent
active
054443130
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns an electromagnetic actuator comprising a central and two lateral poles. The central pole supports an exciter coil and a movable component fitted with thin permanent magnets magnetized in the direction of the air gap.
Prior art makes conventionally known vibrating motors of this type. To limit the vibrations transmitted to the frame supporting the stator, the French patent filed under No. 7213342 proposes suspending not only the rotor, but the stator as well. The vibrating actuator according to prior art thus incorporates two suspended weights whose characteristics (weight, stiffness of the suspension mechanisms) are specified so as to equalize the characteristic frequencies. However, these actuators are relatively fragile, given the complexity of the dual suspension system and the mobility of the stator, which requires, in particular, flexible electric linkages.
Prior art also includes U.S. Pat. No. 4,583,027, which describes a motor incorporating a single rotor driven in a vibratory motion which, by reaction, generates vibrations on the stator and its base.
Prior art further encompasses German Patent No. 2603681, which utilizes the activity of a magnetic field on a current. The rotor consists of a permanent magnet placed within the air gap. This motor does not make it possible to reach a satisfactory power level as measured in watts applied to the coil, since the functioning parts of the coil are those placed directly within the field produced by the magnets. The greater the thickness of copper desired, the more the field decreases, or the greater the thickness the magnets must posses, and, therefore, the greater the moving weight. Moreover, each magnet is attracted by the two stationary iron components, depending on its distance from each of them, and no means are provided in order to prevent the magnets from binding to one of them without hindering the motion sought.
The purpose of the invention is to produce a high-performance, reliable actuator for applications which require high-frequency alternating motion and which limit interference vibrations on the stator.
The mobile device belonging to the actuator according to the invention comprises at least two independent parts moving in opposite directions and in a direction parallel to the intersection of the plane of the air gap and the median plane of the fixed stator element. Each of the moving parts incorporates a pair of thin magnets magnetized in alternating directions and attached to a yoke made of a soft material, the thin magnets belonging to one of said moving parts being magnetized in the direction opposite that of the corresponding thin magnets belonging to the adjacent moving part, the yokes and the fixed stator element delineating the air gap E.
The actuator according to the invention allows optimal flow of the magnetic fluxes and makes it possible to maximize the stresses generated on the moving parts.
The motion of the moving parts is theoretically linear. The actuator according to the invention may also be produced in a cylindrical shape, the motion of the moving parts taking place, in this embodiment, along arcs of circles described on a cylinder coaxial to the cylindrical air gap.
In a first variant, the mobile device comprises two opposing moving elements of identical weights, each of these moving elements being connected to the fixed stator element by deformable means, in order to allow a swinging motion in the direction of mobility, while at the same time keeping a substantially constant air gap E. The quantified movement of one of the moving elements is identical in absolute value, and occurs in the direction opposite, to the quantified movement (product of the weight in relation to velocity) of the other moving element. Accordingly, the total quantified movement of the vibrating parts is nil, thereby making it possible to reduce appreciably the interference vibrations transmitted to the actuator support.
According to another variant, the mobile device comprises a central and two lateral parts, the wei
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Jones Judson H.
Moving Magnet Technologies (S.A.)
Stephan Steven L.
LandOfFree
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