US817687A - Magnetic actuator. - Google Patents

Magnetic actuator. Download PDF


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US817687A US22191004A US1904221910A US817687A US 817687 A US817687 A US 817687A US 22191004 A US22191004 A US 22191004A US 1904221910 A US1904221910 A US 1904221910A US 817687 A US817687 A US 817687A
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magnetic actuator
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Daniel Bacon
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    • H02K49/00Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/10Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
    • H02K49/102Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact


No. 817,687. PATENTED APR. 10, 1906. D. BACON.
Specification'of Letters Patent.
Patented April 10, 1906.
Application filed Augnlt 24, 1904. Serial No. 221,910.
To all whom it may concern: 7
Be it known that I, DANIEL BACON, a citizen of the United States, residing in the borough of Brooklyn, in the county of Queens and State of. New York, have invented a new and useful Improvement in Magnetic Actua-. tors, of which the following is a specification.
This invention relates to magnetic actuators; and it has for its object the provision of an electromagnetic coe'llicient for mechanical power transmission.
.In ap aratus of this nature it is frequently essentia that its operation may be controlled from a distance, or, in other words, that it should be possible and practicable to make connection electromagnetically between a driving shaft or apparatus and a driven one for the urpose of transmitting motive power to the riven part and to break such connection, thereby bringing the driven part to a stop at will and from whatever position or distance such may be desired in a simple and effective manner. Furthermore, it'is desirable that such transmission of power may take place gradually, without jerks and jolts, and with a minimum of Wear of the actuating parts. I accomplish these objects with the ap aratus hereinafter described, and particular y pointed out in the claim which follows this s ecification.
Re erring to the drawings, in which like letters of reference represent like parts whereever used, and which form part of this specification, Figure 1 is a vertical central sectional view of my improved magnetic actuator. Fig. 2 is a reduced side view of the same, looking from the left toward Fig, 1. Fig. 3 is a similar side view looking from the right toward Fig. 1, but omitting shaft A and electromagnet E. Fig. 4 is a side view of electromagnet E, looking from the left to ward Fig. l; and Fig. 5 is a side view of the complete device, on the same scale and looking om the right toward Fig. 1.
In the form of my invention illustrated in the drawings, A indicates a power or driving shaft, which may derive its impelling energy from any source, while B represents the driven shaft to which power is to be transmitted or conveyed by an electromagnetic connection to be established between these two shafts. Mounted upon the shaft A and rigidly secured thereto, as by a spline or key a, is a sleeve O, having a web 0. Mounted upon the shaft B and rigidly secured thereto, as by a spline or key I), is a sleeve D, having a rm H18,
Web (1. The shaft A is arranged to extend into the sleeve D, within which it is free to rotate, and the sleeve D to extend into the sleeve C, being sufficiently free therein to assure concentricity of the two shafts at all times without undue friction. Rigidly secured to web 0 is an annulus E, preferably formed of ma netizable material possessing a high degree 0' permeability to reduce residual magnetism to a minimum. This annulus E is provided at its periphery with a series of radial rojections e, over which wire-s ools e slipped or otherwise secured t ereto. n this manner a multipolar electromagnet is provided, the annular part forming the yoke and the outwardly-pro ecting magnet ,cores or shanks e bein arranged in a plane at right angles to the s aft A and equidistant from one another.
To the periphery of the web (1 is secured an annulus F, which is also provided with radially-disposed projections f, equal in numher to the number of the projections or cores e on annulus E. These magnet-cores f project inwardly and are arranged in a plane at right angles to the shaft B, forming, in conjunction with annulus F and the wire spools or coils n, a powerful multipolar electromagnet.
The two multipolar electromagnets are mounted on the shafts A and B relatively to one another in such a manner that their cores e and f are at all times in the same plane, with their ole-faces opposite and curved to correspon to the arc of the circle they describe by their rotation and in as close but noncontacting proximity as practicable to reduce the unavoidable air-gap to a minimum.
The wire ,coils ma be connected in series or in multiple, as esired. Placed against the web 0 is a disk G, of insulating material, bearinga pair of collecting-rings g g, and a similar disk H, of insulating material, is placed against the web (1, this disk H bearing the collecting-rings h h. Brushes I I and J J bear, respectively, against the collectorrings g g and h h, conveying current thereto from a suitable source of electrical energy. However, the two multipolar electromagnets may be fed from different sources of electricity. The wire coils m and n are placed on their respective cores in such a manner that the polarity at the pole-faces of the same is alternately north and south, thus requiring an even number of polar projections for both electromagnets.
In the operation of my invention when the two multipolar electromagnets E and F are in a quiescent state-that is, when not being energizedthen the power or driving shaft A with its sleeve C and web 0 and electromagnet E, is free to rotate Without transmitting movement or power to the shaft B, with sleeve D, web d, and electromagnet F, and in this condition a machine to be actuated by said shaft B remains inactive, since the two electromagnets E and F cannot influence one another; but when it is desired to start up a machine whose moving arts are connected with or operated by the s aft B then the coils m and n of the electromagnets E and F are inserted in an electric circuit corn rising a source of electricity, whereupon t e magnetic flux set up in the cores and by the arrangement of the polarity of the pole-faces of the magnet-cores made to pass across the airga s formed by the oppositely-placed said p0 e-faces, provided the o posing ole-faces are of different signs of po arity, W1 1 effect a magnetic union between the two electromagnets, thereby enabling motive ower to be communicated from shaft A to s aft B to rotate the latter. However, I do not wish to confine myself to the manner of connecting the wire coils to obtain in each electromagnet alternating polarity for adjacent polefaces, as described; but I may arrange ,the connections in such a way that all the polefaces of one electromagnet are south and those of the other electromagnet are all north. By such an arrangement the webs c and d, sleeves Cand D, and the ends of the shafts A and B may be included in the magnetic circuit.
While in the drawings I have represented the core-surfaces or pole-faces as separated from each other by relativel considerable spaces, this is merely for t e purpose of 0 early indicating their non-contacting relation.
It is the purpose in employ' my invention to use a very light currentt ifiie improvein'ent being chiefl applicable for governing purposes, and I c not intend to employ it where there is the liability of a counter-generated current equaling the current made use of. It is also my intention to provide for a variation in the speed transmitted from the driving portion of the aparatus to the driven portion, and this e ect I produce by introducing a resistance in the electric circuit, this feature being so obvious as to require' no illustration.
Having now described my invention, I declare that what I claim is A magnetic actuator comprising a drivingshaft and a driven shaft, said shafts having telesco ing concentric sleeves capable of indepen ent rotation, together with a radial web extendin from each of said sleeves and a plurality o electromagnets su ported at the periphery of each of said radia webs, the pole-faces of the magnets upon each periphery being in non-contacting magnetic relation, an electric circuit and means for energizing it.
Fnnnn'nreir C. BONNY, F. W. BARKER.
US22191004A 1904-08-24 1904-08-24 Magnetic actuator. Expired - Lifetime US817687A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630467A (en) * 1946-10-21 1953-03-03 Eaton Mfg Co Electric clutch and brake controlled press

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630467A (en) * 1946-10-21 1953-03-03 Eaton Mfg Co Electric clutch and brake controlled press

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