FR2517892A1 - COLLECTOR RING FOR ELECTRIC APPARATUS OF ROTATING TYPE - Google Patents

Abstract

1. Process for manufacturing a collector ring comprising, in known manner, an annular core (1) in insulating material, at least two conductive ferrules (7-8) fitted tightly on the core and at least two conductors (9-10) welded on the ferrules, said conductors being placed in housings (2-3) of the core and projecting axially out of at least one of the cross faces of the latter, characterized in that it consists in : - defining, in the thickness of the core (1) and from one of the peripheral surfaces, two housings (2-3) shifted angularly and axially, and each issuing onto a transverse face (1_a, 1_b) of the core, - extending at least one of the housings by a hole (6) provided in the thickness of the core until it opens on the same transverse face as the other housing, - welding two conductors (9-10) on the two conductive ferrules (7-8), causing the ferrules to slide on the core (1) peripheral surface where the housings (2-3) issue, while simultaneously engaging the conductors (9-10) into said housings and into the hole, and causing the ferrules to cover said housings, - providing for an axial and angular connection between the core and each ferrule by means of point bars (11-12) penetrating into the material of the core upon the sliding.

Description

The present invention relates to electrical apparatus

  rotating type, such as electricity generators or

  electric power, in the broadest sense, and it aims, more

  in particular, the means employed to ensure the

  between brushes, brushes or coals and the element

  constituent forming armature or inductor.

  To assume the above function, it is known to

  a slip ring comprising an annular core of insulating material, at least two conductive ferrules covering one of the

  peripheral faces of the core, being axially offset, without

  with each other, and at least two drivers in solidarity with

  ferrules, incorporated into the thickness of the core and protruding axially

  outside at least one of the transverse faces of the latter.

  Such a construction can be envisaged in the case of

  mounting on the rotation shaft of a rotdr or, again, on the periphery

inside a cage.

  Sojidaires drivers ferrules are normally intended for connection with the means of energy production

  electrical or processing of the latter.

  The manufacture of such a ring comprises the execution of conductive ferrules which are manufactured from a cylindrical shell of conductive material on which the two conductors

  are reported by welding by being offset axially and angularly

  In the case of a ring adaptable on the shaft of a central rotor, the conductors are reported on the inner peripheral surface of the cylindrical envelope. In general, the insulating core is formed by molding on the envelope and coats both drivers

  which are thus partly imprisoned in the thickness of the soul.

  A recovery operation is then performed to machine a peripheral groove in the conductive envelope to provide a continuity solution for delimiting two ferrules or

  independent conductive tracks which are each connected to a con-

  ducer. The slip rings obtained according to the above process are satisfactory for the function they must perform.

  However, such rings have major disadvantages

to the level of manufacture.

  The molding of the soul on the envelope represents an operation

  overmoulding ration necessarily implying the laying, usually manual, of one or more envelopes equipped with conductors, in an open mold prior to the injection This represents a significant subject increasing the cost of manufacture and decreasing

the rhythm.

  Then, it is necessary to execute, by machining, the

  throat delimiting the two independent tracks from the envelope

  This represents a costly recovery operation which also results in a loss of raw material that can be qualified.

noble when it comes to copper.

  The object of the invention is precisely to overcome these major drawbacks by proposing a new conductive and collector ring, particularly designed to eliminate the insertion and recovery operations, to significantly reduce the price

  of each manufactured article.

  The object of the invention is also to propose a new conductive ring whose manufacture can be envisaged.

  in mass production by means of fully automatic production lines

matic.

  Another object of the invention is to propose a new

  slip ring that can be made to have a number of collector tracks equal or different from two and that

  these tracks can be placed indifferently at the level of

  internal or external peripheral face of the ring, in order to meet all the possibilities of technical realization and construction

  of structures of electrical appliances, rotating type.

  To achieve the above aims, the slip ring, according to the invention, is characterized in that the annular core has in its thickness at

  two axially oriented dwellings,

  at least on one of the transverse faces of the VME and opening at least partially

  by an opening on one of the peripheral faces

  of the soul and in different areas of each other,

  the conductive ferrules are fitted and

  mobilized on the soul and each cover at least partially the opening of a housing, the drivers are each engaged in one

housing.

  Various other features emerge from the

  described below with reference to the accompanying drawings which show

  trent, as non-limiting examples, embodiments

of the object of the invention -

  FIG 1 is a cut-elevation of a ring according to

the invention.

  Figs 2 and 3 are cross-sectional views taken

  respectively along lines II-II and III-III of FIG.

  Fig. 4 is a sectional elevation illustrating another

  embodiment of the object of the invention.

  Figs I to 3 show a first example of

  a slip ring for mounting, by means of a suitable means, to the rotating shaft of a rotating central rotor, such as the armature of a conventional electric machine of

rotating type.

  The connection means between the slip ring and the shaft can be various and involve a bonding or positive drive by fluting, flat, key, etc.

  The slip ring comprises a core 1 made of insulating material

  lant, preferably made of a thermoplastic material The core I is in a ring shape of constant thickness

17892

  the intended application, the axial length of this core can be variable being lower, equal to or greater than its mean diameter. The insulating core I is made to include, in its thickness, at least two housings 2 and 3 extending axially from each of the transverse edges 1a and 1b of the core 1. The housings 2 and 3 are offset angularly, from preferably a measure corresponding to the division of the circumference of the soul I

  by the number of conductive tracks to be established In the illustrative example

  tré, the ring is intended to comprise two tracks and the housings 2 and 3 are preferably offset by 180 The housings 2 and 3 are also maintained so as to lead to one of the peripheral faces of the soul l by openings 4 and 5 which can be

  of the same or different length as the axial length of the

2 and 3.

  In the example shown, dwellings 2 and 3 are

  swam to open at the level of the outer peripheral surface

of the soul 1.

  One of the dwellings, for example housing 3, is

  lined axially by a hole 6, included in the thickness of the core 1.

  The hole 6 opens at the transverse edge of the core 1 corres-

  laying to that from which the other dwelling 2 is provided.

  The slip ring also comprises two conductive ferrules 7 and 8 mounted, without the possibility of axial sliding and angular displacement, at the level of the peripheral surface of

  the core 1 corresponding to the openings 4 and 5 of the housings 2 and 3.

  In the illustrated embodiment, the conductive ferrules 7 and

  8 are thus mounted at the outer periphery of the insulating core 1.

  The ferrules 7 and 8 are provided with conductors 9 and 10

  solidarity, in particular by spot welding of one of the

  these devices In the example shown, drivers 9 and 10

  are reported on the inside.

  The ferrule 7 is mounted so that the conductor 9 is engaged in the housing 2 which is at least partially covered by the ferrule 7 In this state, the conductor 9 protrudes axially

17392

out of the transverse edge la.

  The shell 8 is mounted so that the conductor 10 is engaged in the hole 6 by the housing 3 which is covered, at least in part, by the shell 8 In this state, the conductor 10 also protrudes axially from the transverse edge. .

  An electrical connection can thus be easily

  cut between conductors 9 and 10 and the producing or

  electrical energy transformers of the apparatus.

  Preferably, the ferrules 7 and 8 are mounted by

  axial lightening in the direction of arrows fl-f 2 'from the edges

  cross-sections la-1b, being angularly oriented to

  cider the conductors 9 and 10 with the corresponding housing 2 and 3.

  The ferrules 7 and 8 are mounted to establish an angular and axial connection with respect to the core 1. For this purpose, it is advantageous to include, in the present case, at the inner peripheral face of the conductive ferrules 7. and 8, one or more pins II and 12, each having an inclined face ending in a steep face The orientation of the pins II and 12 is chosen so that the engagement and mounting of the ferrules 7 and 8 can be carried out in the direction of the arrows f 1 and f 2 Preferably, the axial engagement is performed after heating, at least superficial, the core 1, in this case from the outer peripheral surface This allows to penetrate the pins II and 12 in the constituent material in which they are trapped after cooling Another method is to apply ultrasound

  assembly being carried out to induce superheat heating.

  perfective causing a softening of the soul 1.

  As is apparent from the foregoing, the insulating core can be produced quickly, in large series and at very low cost by molding in a parallel installation to a chain of execution of the collector rings 6 and 7. to be obtained quickly in large series, by means of an automatic installation receiving ferrules obtained in any suitable manner on which the conductors are welded and cut from

continuous feeding.

  The manufacture and obtaining of a slip ring according to the invention can then be ensured by an auto assembly.

  of the ferrules 7 and 8 on a ring 1 previously heated.

  Thus, without any inserting operation in a molding unit, or recovery for machining, it is possible, according to the invention, to obtain at a cost significantly lower than the current technique, a slip ring with The essential function of such a ring is to allow electrical contact between ferrules 7 and 8 and brushes, brushes or coals.

  assumed effectively because the ferrules are rendered.

  secured axially and angularly to the core by the pins 11-12

  and by the collaboration between drivers 9 and 10 and the

items 2, 3 and 6.

  In some cases, to avoid interference by

  line between ferrules 7 and 8, provision may be made for

  ger, at the peripheral surface of the soul to be re-

  covered, a peripheral molding, a bead or cord 13 of

  insulating material Such a molding, the thickness of which can be su

  less than that of the ferrules, may advantageously constitute a stop limiting the axial engagement of the ferrules. Depending on the ratio between the axial length of the core 1 and ferrules, the bead 13 may be replaced by two shoulders or two cords spaced apart. of

the other axially.

  The molding 5 can come directly from molding or, possibly

  also be the result of a repression of the superficial layer of the material constituting the soul, in the case, by

  for example, the ferrules 7 and 8 have a diameter slightly less than

  that of the peripheral surface of the soul 1 In such a case,

  the engagement of ferrules 7 and 8 is facilitated by providing

  brakes 14 and 15 at the transverse edges 1a and 1b. These chamfers 14 and 15 are oriented on a rising slope according to the direction

  of engagement and connect the transverse edges to the perimeter

  concerned, in this case the outer surface.

  The construction example given above relates to a slip ring intended to be fixed on the shaft of a rotor of a rotating electrical apparatus. In certain applications, it may be provided to fix such a slip ring at the level of the axis

  a central stator surrounded by a cage-shaped rotor.

  FIG. 4 shows an embodiment according to which the slip ring is designed to be adapted, not on an axis or a shaft, but at the inner periphery of a

  In such a case, the shells 7 and 8 are then

  seen in order to be reported on the inner peripheral face of the soul 1 In such a case, the housings 2 and 3, of the same conformation as

  described above, are arranged to lead to

  vertices 4 and 5 at the inner peripheral face of the soul

insulating 1.

  In the various examples given above, the slip ring comprises two ferrules 7 and 8, having an axial measurement substantially equal to half of that of the core 1, possibly after the molding 13. A different embodiment can be envisaged. using ferrules 7 and 8, axial measurement

  significantly lower, which can be placed substantially close to

  transverse edges 1a and 1b or, conversely, be placed at a distance from the latter of an identical measurement, or

  even different, as far as the two ferrules are concerned.

  Similarly, it may be provided to make a collector ring

  trice having more than two rings 7 and 8 A construction with three collector rings then involves a shell 7, called

  extreme, a ferrule 8, called a central ferrule, and a third ferrule

  the homologous position of the ferrule 7 with respect to the ferrule 8.

  In such a case, the housing required to

  The ductors are angularly offset by 120. In addition, two of these dwellings are extended by a hole 6 so that all

  conductors protrude from the same transverse edge.

  To the extent that such an obligation is not

  pect, the ferrule homologous to ferrule 7 involves means

  similar to those of the latter.

17892

Claims (8)

I collector ring for electrical devices of the rotating type, comprisingan annular core of insulating material, at least two conductive ferrules covering one of the peripheral faces of the core being axially offset without contact with each other and at least two conductors secured to the ferrules, incorporated in the thickness of the core and protruding axially out of at least one of the transverse faces thereof, characterized in that: the annular core (1) has in its thickness at least two housings (2-3) of axial direction, opening at least on one of the transverse faces of the core and opening at least partially by an opening (4-5) on one of the peripheral faces of the core and at different zones from one another, the conductive ferrules (7-8) are fitted and immobilized on the core and each cover, at least partially, the opening of a dwelling, the drivers (9-10 ) are each engaged in one of the dwellings.   Collector ring according to claim 1, characterized   in that the ferrules (7-8) are attached to the surface   outer periphery of the soul (1).   Slip ring according to claim 1, characterized   in that the rings (7-8) are attached to the circumferential surface   inner phérique of the soul (1).   4 slip ring according to one of claims 1   at 3, characterized in that the ferrules (7-8) are attached to the peripheral face of the core (1) opposite that provided with the means   link with the armature of the device.   Slip ring according to one of the claims   1 to 3, characterized in that the ferrules (7-8) are attached to the peripheral face of the core opposite to that provided with 17892   connection with the inductor of the device.   6 slip ring according to one of claims 1 to   , characterized in that the ferrules (7-8) are mounted to be located each near one of the transverse edges (la-lb) of the annular core (1).   7 Slip ring according to one of claims 1 to   6, characterized in that the ferrules (7-8) overlap at least   the openings (4-5) of the housings (2-3) which are staggered   angularly of a measure corresponding to the division of the circumference   Feel of the soul by the number of ferrules.   8 slip ring according to one of claims I to   7, characterized in that the ferrules (7-8) overlap at least   the openings (4-5) of the housings (2-3), at least one of which is formed in the thickness of the core (1) from one of the transverse edges (1a) and of which the other is arranged in the same way from the second transverse edge (Ib) and is extended by   a hole (6) delimited axially in the thickness of the soul to   at the first transverse edge (la).   9 slip ring according to one of claims I   at 8, characterized in that the rings (7-8) are immobilized on   the soul via pins (1-1-12) penetrating into the constitutive part of the soul.   Slip ring according to one of claims I to   9, -characterized in that the ferrules (7-8) are separated by a   bead (13) or a molding formed by the insulating core.