FR3090236A1 - Electric motor, for starter, comprising a pin rotor and a collector - Google Patents

Abstract

The invention relates to an electric motor comprising a rotor comprising: i. a collector (2) comprising: connected connection zones (211) and isolated connection zones, conductive strips (21) electrically connected to the connected connection zones (211), ii. a rotor body (1) comprising: notches (100), at least one winding comprising sections (11) each comprising at least two pins (110) each comprising: a first connection portion (1102A) fixed in one of the zones of isolated connection (212) and electrically connected to another first connection portion (1102A) of another pin (110) of the same section (11) and a second connection portion (1102B) located in one of the connected connection areas (1102B) and connected in the connected connection area (211) to a second connection portion (1102B) of a pin (110) of another section (11). Abstract figure: Figure 2

Description

Description

Title of the invention: Electric motor, for starter, comprising a pin rotor and a collector Technical field

The present invention relates to an electric machine, in particular of the DC type, for a starter comprising a rotor wound with pins. Prior art

It is known electrical machines comprising rotors wound with pins in "U" and rotors wound with fine son. It is known to use two types of winding, corrugated winding and nested winding. The wavy coil has a progression in waves while the nested coil has a progression in loops.

The corrugated winding is received in (k * p) ± 1 notches of the rotor, with k integer and p, the number of pairs of poles of the electric machine. The nested winding is received in (k * 2 * p) notches of the rotor. Corrugated winding is often preferred for reasons of manufacturing cost because the nested winding imposes a balance between successive poles, in terms of magnetic reluctance, such as at no-load (zero armature current), the same geometric configuration of flux tube shared by 2 successive inductor poles, this tube being subjected to the same difference in magnetic potential, does not have substantially any reluctance variability, that is to say that by pair of successive poles the reluctance is almost constant . This allows excessive wear of the brushes due in particular to the circulation current which comes from LEM imbalances.

The windings have 2 * parallel channels, with an integer. A channel includes sections in series. A section includes one or more turns in series and a turn is formed of two conductors connected together, one in a direction called "go" and the other in a direction called "return". The conductors include active portions and connection portions.

The electric motor of a starter must provide a sufficiently high level of torque and speed.

Known speed / torque conversion solutions are either to modify the electric motor, or to mechanically modify the rotor speed / crankshaft speed ratio of the heat engine, for example by changing either the mechanical speed reducer of the starter, or the ratio between the number of teeth of the crown of the engine and the teeth of the starter pinion.

For reasons of realization of the electric motor it is therefore sometimes preferable to modify the winding whether it is nested or corrugated to have several turns a, b, c in series in the same section A making it possible to improve the performance of the machine.

Figure 1 shows a section A of a winding, whether wavy or nested, comprising three turns a, b, c. Section A comprises a conducting wire L comprising for each turn a, b, c, first active parts a1, b 1, cl located in a notch and second active parts a2, b2, c2 located in another notch along a pitch notch d, also called polar pitch. The active parts a1, b1 and c1 each belong to a “go” conductor of the turn. The active parts a2, b2 and c2 each belong to a “return” conductor of the turn. The conductive wire comprises connecting portions 1 on either side of the notches making it possible to connect a first active portion a1, b 1, cl, to a second active portion a2, b2 c2 and in that the first turn a and the last turn c each comprise a connection portion Ca and Ce respectively.

In known manner, the connection portions Ca and Ce are either folded towards one another and inserted into two contiguous different notches of a collector one next to the other to form a nested winding or either folded one opposite the other and inserted into two notches in a collector spaced apart by a pitch larger than the pitch d of the notches of the rotor, to form a corrugated winding.

The active portions of a winding section in a notch form a beam L which therefore comprises a section surface less than a section surface of a section beam having only one active portion in a notch . In a winding comprising the same number of tracks of a rotor comprising the same number of notches and the same size of the rotor, the greater the number of turns in each section the greater the electrical resistance per turn of each section increases but due to the active portions in series, the more the electromotive force increases. Thus, it is sometimes useful to use an electric motor comprising several turns.

When the winding comprises several turns per section, the winding is carried out using flexible or rigid wound wire inserted radially into the notches. The rigid wires can be preformed and are inserted radially into the notches radially, unlike pins inserted axially.

In a rotor comprising a wire winding, the notches are separated from each other by teeth. These teeth are either in the form of an "I" allowing insertion of conductors having a diameter or a width close to the width of the notch or can be in the form of a "T" to form semi-closed notches but requires that the diameter or the width of the conductor is restricted to the width of the semi-closed radial opening of the notch reducing the filling rate but also increasing the resistance of the windings.

Pins can also be used to form the winding. Pins are different from wires in that they each include only two active portions in the notches of the rotor while the wires can have more than two active portions, for example four active portions.

Before being bent and welded, the pin comprises two straight portions longer than the notches of the rotor and a connecting portion connecting the two straight portions. During the winding process, the two straight portions of the pin are inserted axially into two notches in a package of rotor sheets. Then the two portions which have come out of the notches, hereinafter called the connection portion, are inserted into the notches of a collector to be connected to other pins and to conductive blades of the collector on which brushes come to rub to feed pins. In general, the connection portions are folded before being inserted into the notches in the collector. The collector comprises radially extending walls, blades forming notches in the collector which thus make it possible to electrically connect a pin of one section to the conductive blades and to at least one other pin of another section in the same notch of the collector. . In addition, the positioning of the connection portions of the pins in the notches makes it possible to stiffen the connection of the pins to the collector. This makes it possible to better resist the centrifugal force which is applied to the connection portions. Indeed, especially due to the necessary folding of the pins, the length of each connection portion of the pins can be large enough for the centrifugal force to cause its deformation and cause damage to the electric motor.

The advantage of pins is to have a conductor of a section independent of the radial opening of the notch and therefore to have a better conductor filling rate in a notch than the winding by wire dependent on the radial opening, while having T-shaped teeth whose tooth head partially radially closes the notch of the rotor.

The fact of having a rotor having semi-closed notches makes it possible to have a larger air gap area and therefore to improve the performance of the electric machine, in particular in terms of torque level.

There is therefore a need to have, for reasons of cost, sizing or even durability of the starter, an electric machine having an induced rotor comprising several turns per section while having a conductor whose section may have dimensioning not constrained by the radial opening of each notch of the rotor.

Summary of the invention

We see that there is a need to provide an electric machine having an induced rotor comprising several turns per section while having a conductor whose section can have a dimension not constrained by the radial opening of the notch.

According to the invention, there is a tendency to satisfy this need by providing an electric motor for a motor vehicle, in particular for a motor starter comprising: a. a stator comprising a number 2 * p of poles

b. a brush holder comprising positive brushes and negative brushes,

vs. a rotor comprising:

i. a rotation shaft having an axis of rotation, ii. a collector comprising:

• connected connection zones and isolated connection zones, • X-shaped conductive blades rubbing with positive brushes and negative brushes when the rotor turns around the axis of rotation, and in that each of the conductive blades is electrically connected to a corresponding connected connection area, iii. a rotor body comprising:

• a sheet pack comprising sheets stacked axially, the sheet pack having a number Z of notches open axially and radially on the outside, • at least one winding comprising winding sections, each section comprising at least two pins electrically conductive, each of the pins comprising:

• two active portions each located in a separate notch among the Z notches, • a front connection portion forming a bun on an axial side of the sheet pack opposite the collector, each connection portion connecting the two active portions in two different notches, • a first connection portion located and fixed in one of the isolated connection areas and electrically connected in the isolated connection area to another first connection portion of another pin of the same section and • a second portion connection located in one of the connected connection areas and connected in the connection area connected to a second connection portion of a pin of another section.

The invention thus allows the use of pins to make at least two turns for a winding section. In fact, by connecting two pins of the same section, the section includes two loops, and the collector comprising isolated connection zones for retaining the pin connections makes it possible to solve the problem of centrifuging the pins.

The invention thus allows the simple and inexpensive use of pins to produce a section comprising at least two turns, the conductor (the pin) of which is independent of the radial opening of the notches in the sheet pack. Such an electric motor is much less costly and complex to produce than the axial insertion of a wire into the notches to produce two turns or else to modify an "I" shape into a "T" shape of the teeth after the sheet bundle is wound by wire.

By winding section means the part of a winding connected between two conductive blades without passing through a connection to another conductive blade. Thus each conductive strip is connected to two winding sections and in that each winding section comprises several pins connected in series between two conductive strips.

The first connection portions of two pins are electrically connected to the conductive strips by means of at least a second connection portion of one of the pins forming the section. The isolated connection areas are electrically connected to the conductive strips by at least one section pin.

The device according to the invention may also have one or more of the characteristics below, considered individually or in all the technically possible combinations:

According to a first embodiment, the isolated connection zones and the connected connection zones are regularly angularly distributed alternately one after the other around the axis of rotation. This makes it possible to increase the size of the conductive blades and consequently those of the brushes in order to improve the durability of the electric machine.

According to a second embodiment that can be combined with the first embodiment, one of the second connection portions located in a connected connection area axially crosses the connected connection area and is connected to one of the conductive strips to make the connection connection between the conductive strip and the connected connection area.

According to an example of this second embodiment, the collector further comprises connection pieces spaced from the conductive strips by an insulator, and in that one connection piece out of two forms a connected connection zone and the others Connection pieces each form an isolated connection area.

According to a third embodiment which can be combined with the first embodiment, the collector comprises an electrically conductive portion by conductive strip, each of the conductive portions is connected to the conductive strip and to the corresponding connected connection area to connect them electrically and in that each connected connection zone is in contact with the corresponding second connection portions of the pins, the connected connection zone electrically connecting the corresponding conductive strip to the corresponding second connection portions via the conductive portion.

According to a fourth embodiment which can be combined with the characteristics of the embodiments described above, the collector comprises electrically conductive walls extending from the conductive strips and an insulator between each wall. Each wall includes connection notches forming the connection areas and in that each of the second connection portions includes a part in the corresponding connection notch.

According to an example of this embodiment, each wall is in one piece and formed of the same material with the corresponding conductive strip. According to an embodiment of this example, the insulator comprises a hole forming the isolated connection zones.

For example, the insulation is overmolded on the conductive strips and between the walls to isolate the strips and low walls connected together from the other adjacent strips and low walls. The insulation can radially close the notch between two walls which form a radially through hole between them.

For example, each low wall partially closes the notch forming the insulated connection area between two low walls and the insulation closing the space between the two low walls, the low walls thus retain the insulation in the notch. For example, each low wall has a form of "Ω", the middle of the omega forming the connected connection area and the two ends extending on either side angularly partially closing the notch between two low walls.

In one example, the notch in each wall forming the connected connection area is opened radially to allow the insertion of a second connection portion radially into the connected connection area.

According to a variant of the previous example, the insulator is a sleeve comprising rails in which the conductive strips with the walls are arranged to hold them together and isolate the strips and walls from the other strips and walls.

In these two examples the first connection portions include one end in the connection areas.

In these two examples, the first portions can be connected by a weld formed on the connection portions.

Alternatively, the wall includes two portions forming a notch forming the connected connection area and the collector may include connectors comprising the insulated connection area located between two portions of two different walls, the insulation being located between the two portions of the two walls and the connector for isolating the two portions from one another and a connector in the insulation comprising a notch forming the isolated connection areas.

For example, the connector is a part having a material identical to the walls and the blades, for example copper. For example, each connector comes from a cut in a ring, the cut of which forms the two low walls. This allows for a simple manufacturing process for the walls.

For example, the insulation is overmolded on the conductive strips and between the walls to isolate the strips and walls connected together from other adjoining strips and walls. It can also be overmolded on the connectors.

In one example, the connected connection area and the isolated connection area are notches of the same shape respectively in the connector and the walls. This allows the connection and insertion of the first connection portions to be made in the isolated connection areas in the same way as the connection and insertion of the second connection portions to the connected connection areas. Thus, the manufacturing process is simpler and faster.

According to a fifth embodiment which can be combined with the third and fourth embodiment, the isolated connection zones are located axially between the sheet pack and the connected connection zones.

According to an example of this fifth embodiment, the conductive strips are angularly and axially offset from the connections between the first connection portions of two pins of a section. Thus, the connections of the first sections do not reduce the available space of the brush holder around the conductive strips of the collector.

According to a first implementation of the invention may include the features described above, the winding is a nested winding in which the number of notches between two active portions connected by a connecting portion of a pin is greater than number of notches between two active portions of two different pins connected together by two first connection portions and in that the number X of blades is equal to the number Z of notches divided by two and the number of brushes is equal to the number of pairs of stator poles.

Thus, such a nested winding allows, relative to the conventional nested winding, on the one hand to be produced by pins increasing the performance of the starter compared to the same wired winding, because the pins can have a cross section greater than that copper wire and on the other hand to be able to make blades wider than in the prior art and therefore brushes having a contact surface with the brushes wider than in the prior art since there are two times less blades than notches of the sheet pack.

According to a second implementation of the invention which may include the characteristics described before the first implementation of the invention, the winding is a wavy winding, in which each pin of the section comprises an active portion in a first notch of the section and a second active portion in a second notch of the section and in that the at least two pins of the section are connected together by the first connection portions and in which the number X of collector blades is equal to Z notches in the sheet package.

According to an example of this winding, the pitch of two active portions in two notches of a section is less than the pitch between two conductive blades electrically connected to the second portions of the section. The term conductive strip electrically connected to a second connection portion means an electrical connection without passing electrically through other sections.

Thus it allows to have a wavy winding pin with several turns per winding section. In the prior art, such a winding of a corrugated starter armature was produced by wires.

According to one of the two implementations of the invention, in which the sheet pack comprises teeth between each notch of the sheet pack and in that each tooth comprises a T-shape partially closing the notch radially.

Thus it increases the performance of the starter compared to a corrugated wire winding having notches in the shape of I. Indeed, the fact of putting pins makes it possible to have teeth in the shape of T closing partially the notches of the sheet pack to increase the airgap area between the armature and the inductor and therefore an improvement in motor performance.

In these two implementations, each conductive strip is connected to two winding sections and in that each winding section comprises several pins connected in series between two conductive strips.

The invention therefore makes it possible to reduce the number of blades without reducing the number of sections. The goal is to widen the conductive blades and therefore the brushes for more durability of the electric machine without losing torque and without reducing the number of notches. The conductive strips are widened by implanting isolated connection zones between the connected connection zones to connect the turns formed by the pins together. The collector is thus a connector with intermediate connections ”.

Brief description of the drawings

Other characteristics and advantages of the invention will emerge clearly from the description which is given below, for information and in no way limitative, with reference to the appended figures, among which:

The [fig. 1] represents a section of a winding by a wire.

[Fig.2] shows in perspective a rotor according to a first embodiment of the invention and Figure 3 shows a collector in perspective of the rotor shown in Figure 2.

[Fig.4] shows in perspective a rotor according to a second embodiment of the invention and [Figure 5] shows a section of a collector in perspective of the rotor shown in Figure 4.

. [Fig.6] schematically represents a rotor according to a third embodiment.

[Fig.7] schematically shows a first implementation of the invention according to a nested winding comprising pins according to this first implementation.

[Fig.8] schematically shows a second implementation of the invention according to a corrugated winding section with two pairs of notches comprising pins according to this first implementation.

[Fig.9] shows a rotor body of the first embodiment comprising a single winding section according to the first implementation of the invention shown in Figure 8.

[Fig.10] shows the collector of Figure 3 from another perspective with the winding section of Figure 9.

For the sake of clarity, identical or similar elements are identified by identical reference signs in all of the figures.

DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT

The starter of the invention comprises a stator, a brush holder and a rotor shown schematically in Figure 2 according to a first embodiment.

The rotor of Figure 2 comprises a rotor body 1 shown partially in Figure 9. The rotor body 1 comprises a sheet package 10 comprising sheets stacked along an axis O of rotation. The sheet pack 10 includes a number Z of notches 100, in this case eighteen notches 100 are shown, but the sheet pack can also include twenty.

Each notch 100 is open axially and radially on the outside. Between two notches 100, the sheet pack 10 includes teeth 101 in the shape of a "T" partially closing the radial opening of the notches 100. In other words, the teeth 101 of the sheet pack 10 form notches 100 between them.

The rotor body 1 further comprises a coil 11. The coil 11 is in this case a nested coil with two pairs of notches per section.

Figure 7 schematically shows another example of the nested winding 11 according to the invention but with twenty notches in the rotor and a different pitch from the number of notches for a pin explained below.

The winding 11 comprises pins 110, two of which are shown in the sheet pack in FIG. 9. The pins 110 are conductors in this case made of copper but could be made of aluminum. Each pin 110 comprises two active portions 1100, a connecting portion 1101 and two connection portions 1102.

Each active portion 1100 is located in a notch 100. The two active portions of a pin are located in two different notches in a pitch PI. In the example of FIG. 9, the pitch of the active portions of a pin is nine notches while in the other example of nested winding shown in FIG. 7 the pitch of the active portions of a pin is of five notches . In other words, in the example of winding of FIG. 7, there are four notches 100 between the two notches 100 in which is located an active portion 1100 of a pin 110 and in the example of FIG. 9, there are has eight notches between the two notches 100 in which is located an active portion 1100 of a pin 110.

All of the connecting portions 1101 of the pins 110 forming the winding 11 form a front bun and each connecting portion 1101 extends on either side of a front end of an active portion 1100 connecting the two active portions 1100 of a pin 110.

Each connection portion 1102 extends from a rear end of an active portion. The connection portions 1102 are dissociated into a group of first connection portions 1102A and into a group of second connection portions 1102B.

The rotor further comprises a collector 2 connected to the winding 11. The rotor comprises a rotation shaft 3 for mechanically connecting the collector 2 to the rotor body 1 integrally rotated with each other. In other words, the package of sheets 10 of the rotor comprises an opening comprising the axis of rotation O in which the rotation shaft 3 crosses in rotation around the axis of rotation O. The collector 2 is notably shown in the figure 10 with two pins connected to the collector 2 as well as in FIG. 3 in perspective.

The collector 2 comprises on the one hand an electrical insulator 20, for example plastic, in this case an insulating sleeve comprising housings and conductive strips 21 fixed in the housings of the sleeve 20. The insulator 20 is then called sleeve 20 or insulating sleeve 20. The sleeve 20 isolates the conductive blades from each other but the conductive blades are electrically connected to each other by the winding 11. The starter motor further comprises a brush holder, not shown, comprising positive brushes + and negative brushes - visible diagrammatically in the schematic representation of the winding 11 in FIG. 7.

The brushes rub on the conductive blades 21 of the collector 2 to power the winding 11. The second portions 1102B are electrically connected directly to the conductive blades 21 of the collector 2 and the first portions 1102A are electrically connected to the blades of the collector 2 by au at least two active portions 1100, a connection portion 1101 and a second connection portion 1102B.

Thus the winding 11 comprises sections 1 IA of the winding 11, one section of which is shown in FIGS. 9 and 10. Each section 11A is electrically connected to two conductive strips 21 without passing through the other sections of the winding connected in series. Each of the two blades connected to one section is electrically connected to another different section.

In this winding 11 a section 11 A is shown in bold in FIG. 7. The section 11A is formed by a first pin 110X and a second pin 110Y, the first pin 110X comprising a first portion 1102AX connected to the first portion of connection 1102AY of the second pin 110Y.

The pitch PI of the active portions of a winding pin being of five notches in FIG. 7, the first active portion 1100 of the first pin 110X extending from the first connection portion 1102AX is located in a notch 100 numbered N, in this case in FIG. 7 numbered 8 and in that the second active portion 1100 extending from the second connection portion 1102BX is located in a notch N-5 numbered in this case 3 (ie the number 8 of the notch of the other active portion minus the pitch PI is equal to five).

The first active portion 1100 of the second pin 110Y extending from the first connection portion 1102AY is located in a notch 100 numbered N4 which is in this case in Figure 7 numbered 4. The second active part 1100 s the extension of the second connection portion 1102BY of the second pin 110Y is located in a notch numbered N + 1, in this case numbered 9.

A pitch P2 between two active portions of a section extending from the two second connection portions is therefore greater (in this case the pitch is equal to 6) than a pitch P3 between two active portions of a section extending from the first two connection portions which is in this case 4.

In other words the number of notches between two active portions of a section extending from the first two connection portions is less (in this case 3) than the number of notches between two active portions of section s 'extending from the two second connection portions (in this case 5).

In other words, the first pin 110X and the second pin 110Y are each in a pair of different notches 100. The notches 100 of the first pair of notches are contiguous with the notches 100 of the second pair of notches and are offset in the same direction.

In other words, the first pin 110X and the second pin 110Y of section 1 IA form two loops in series offset in a pitch of 1.

The connection portion 1102A is fixed in a heel electrically connected to a blade numbered M, in this case number 2 and the connection portion 1102A is fixed in a heel electrically connected to the blade M + l, in the occurrence number 3.

In Figure 3, the heel is formed by walls 24 each extending radially from one end of the blade. Each low wall 24 is in this case monobloc with the conductive strip 21 and is for example made of copper.

Each conductive strip 21 is connected to two winding sections IA 1 and therefore each winding section 11A comprises several pins 110, in this case two pins, connected in series between two conductive strips 21.

In the example shown, each pin 110 comprises a first connection portion connected to a first connection portion of another pin and comprises a second portion connected to a blade of a collector.

The starter motor further comprises a stator comprising a number p of pairs of poles 4, in this case two pairs of poles and the number of positive brushes + is equal to the number p of pairs of poles which is also equal to the number of negative brushes The connections of the first connection portions 1102A are made by welding.

Each wall 24 comprises two portions 240 forming a notch forming a connected connection area 211 of the second connection portions 1102B. The connection can thus be made either by welding or by plastic deformation of the second 1102B connection portions in the notches or else by means of a resin in the notches of the collector closed radially by a ring after deformations of the second portions in the notches of the collector to ensure good contact between the wall 24 and the second portions.

The collector further comprises the connected connection area 211, an isolated connection area 212. The connection area 212 is formed between two walls 24, that is to say between two portions 240 of two walls 24 different. The insulated connection area 212 comprises an insulator against two axial faces of two walls 24 to isolate the insulated connection area 212 from the walls 24.

By isolated "the isolated connection area 212 of the walls 24" means that the isolated connection area 212 is not electrically connected to the connection areas connected without the winding 11. In other words, it means that the current to pass from the connection area connected to the isolated connection area must pass through the active portions 1100 and the connection portions 1101.

In this embodiment, the first connection portions 1102A are connected in the isolated connection area 212 to one another, for example by welding.

In this example of this embodiment, the insulator 20 of the manifold 2 forming the sleeve comprises a portion 200 extending between the walls 24 and is in contact with the first connection portions 1102A connected together in the area isolated connection. According to another example not shown of this embodiment, the insulation between the walls 24 in contact with the first connection portions 1102A is for each isolated connection area, a complementary piece such as insulating paper with resin.

In this example of this embodiment, the isolated connection areas are closed radially by the portion 200 between the walls 24 forming an axial hole. This keeps the connections of the second 1102A connection portions against centrifugal force and therefore prevents them from deforming or even disconnecting.

In this case each portion 240 of each wall 24 includes a projection extending towards a portion 240 of another wall 24 partially closing radially the notch between the two portions 240 of the two different walls 24 different. Thus, the projections make it possible to maintain the insulation as well as the first 1102A connection portions in the connection area insulated against centrifugal force.

In this case, the portion 200 of the insulator 20 in the notch forming the insulated connection area 211 is also located between the two projections, completely closing the notch between the portions 240 of two different walls 24 forming thus an axially traversing hole.

In this example of this embodiment, the notch in each wall 24 forming the connected connection area 211 is opened radially to allow the insertion of a second connection portion 1102B radially in the connected connection area 211 .

Each low wall 24 therefore has a shape of Ω extending, upside down radially with respect to the axis of rotation, of one end of a strip 21. The middle of the low wall 24 in the shape of an omega, that is to say the notch, forms the connected connection area 211, and the two ends of the omega form extend on either side towards the outside, generally closing the notch between two walls . The insulator thus is retained in this notch forming the insulated connection area.

According to another embodiment shown in Figure 4, the manifold comprises connectors 22 between two walls 24 and in that the insulator 20 comprises a portion located between each connector 22 and the two adjoining walls 24. More specifically, each portion 240 of the walls 24 comprises a first surface in contact with an insulator 20 surrounding a connector 22 and a second surface forming the notch in contact with the second connection portions 1102B.

Each connector 22 is therefore isolated from the adjoining low walls 24 by the insulator 20. By isolated a connector 22 from a low wall 24, it is meant that the connector forming the isolated connection zone 212 is not electrically connected to the low walls 24 forming a connection area connected without the winding 11. In other words, it is understood that the current to pass from the connection area connected to the isolated connection area must pass through the active portions 1100 and the connection portions 1101.

Each connector 22 includes an isolated connection area. In this case in this example, each connector 22 comprises a notch open radially to form the insulated connection area 212. The connector 22 therefore comprises two contact surfaces 221 extending axially and radially to form the notch forming the connection area isolated. The contact surfaces 221 are in contact with the first connection portions 1102A. The connector 22 isolated from the walls 24 can therefore be electrically conductive to improve the connection between the first connection portions 1102A.

In this case, in this example shown the connector 22 has a material identical to the walls 24, for example copper. In this case, each connector comes from a cut in a ring, the cut of which forms the two low walls and the cut piece forms the connector 22. This makes it possible to have a simple manufacturing process for the low walls. The insulator 20 therefore replaces the removed material linked to the cut to isolate the connector 22 from the blades 21 and the walls 24.

In addition, the shape of the notches forming the connected connection area 211 and the isolated connection area 221 are notches of the same shape respectively in the connector 22 and the walls 24. Thus the method of insertion and connection of 1102 connection portions is identical.

In the two embodiments described the insulator 20 is a radial extension of the manifold sleeve 2. In these embodiments, the sleeve 20 can be molded onto the conductive strips forming the housings in which the conductive strips are fixed 21 with the low walls 24. In the second embodiment, the insulation 20 can also be overmolded on the connectors 22 between the connectors 22 and the low walls 24.

In the two embodiments described, the wall 24 includes a notch comprising two contact surfaces 213 extending radially and axially in contact with the second connection portions 1102B.

According to a variant, the insulating sleeve 20 may also include housings comprising axial rails in which are inserted the conductive strips 21 and / or the walls 24 and in the case of the second embodiment the connectors 22.

According to another example not shown of the second embodiment, the insulation between the walls 24 and the connector 22 is an insert. According to another example, the insulation between the walls 24 and the connector 22 comprises an insert by connector 22.

In the two embodiments, the connections of the first connection portions 1102A and / or of the second connection portions 1102B can be made using a solder.

According to a third embodiment shown in Figure 6, the collector 2 further comprises conductive strips 21, connection pieces 23 spaced from the conductive strips 21 by an insulator, in this case the insulating sleeve 20.

In this third embodiment, one connection piece 23 out of two forms a connected connection area 211 and the other connection pieces each form an isolated connection area 212.

Each connection piece 23 is located axially between the blades 21 of the manifold 2 and the rotor body 1.

In this embodiment, one of the second connection portions 1102B located in a connected connection area 211 passes axially through the connected connection area 211 and is connected to one of the conductive strips 21 to make the electrical connection between the conductive strip 21 and the connected connection area 211.

The connection pieces 23 in this case have a blade shape like the contact blades, each connection of the first connection portions on a connection piece forms an isolated connection area and is produced by welding and each connection of the second connection portions on a connection piece 23 forms a connection area connected by the second connection portion electrically connected to a conductive blade 21 and in that the connection is made by soldering.

According to another example not shown, the connection pieces 23 can have a shape like the connectors 22 of the second embodiment and each connection of the first connection portions and of the second connection portions on a connection piece respectively forms a isolated connection area and a connected connection area. The connections of the connection portions 1102 can be made by welding, or plastic deformation of the connection portions 1102 in the notches or else varnished as explained above.

The implementation of these three embodiments is in this case carried out with a nested winding 11, an example of which is described above with reference to the winding of FIG. 7 but can be implemented with a corrugated winding 11 ′ shown schematically in part in FIG. 8.

The corrugated winding 11 ’shown in part in Figure 8 includes winding sections 11B.

More specifically, three sections 1 IB have been shown in FIG. 8 as well as numbering of the notches 100 of the sheet metal package 10 of the rotor body 1 and numbering of the conductive blades 21 of the manifold 2.

A first section 1 IB 1 and a second section 11B2 in series with one another are shown in bold in FIG. 5 as well as a third section 11B3 wound in a notch in the first section 11B1 and in a notch 100 of the second section 11B2.

In the corrugated winding shown, the sections 1 IB include two pins connected in series together by their first connection portion 1102A. In this case the connection is also a weld.

The first section 11B1 therefore comprises a first pin 11 OBI comprising an active portion 1100 in a first notch N numbered 1 connected to a conductive blade numbered 1 by a second connection portion 1102B1, and a second active potion 1100 in a second N + 5 notch numbered in this case 6 connected to a second pin 11B2 by the first connection portion 1102A1 of each of the two pins 11B1 and 11B2. The pitch of the active portions is therefore five notches, or four notches between two active parts of a pin.

The second pin 11B2 comprises an active portion 1100 in the same first notch numbered 1, extending from its first active portion 1102A2. The second pin 11B2 comprises a second active portion 1100 in the second notch numbered 6 and extends from its second connection portion 1102B2 connected to a conductive strip numbered 11. In other words the pitch of the conductive strip 21 is eleven strips and the pitch of active portions 1100 is five notches.

Each pin 100 of a section 1 IB therefore comprises an active portion 1100 in a first notch N of section 1 IB and a second active portion 1100 in a second notch N + 5 of section 1 IB and in that the at least two pins 110 of section 1 IB are connected together by their first connection portion 1102A by a solder (or in a notch of a connection piece or in a connector) and are each connected to a conductive blade by their second connection portion.

The second section 11B2 in series contiguous with the first section 1 IB 1 comprises a first pin comprising a second connection portion 1102B connected with the second connection portion 1102B2 in a connection area 211 of the manifold 2 for connecting the blade conductive 21 to the two sections 11B2 and 11B1. The first pin 110B1 and the second pin 110B2 of the second section 11B2 comprises an active portion 1100 in a first notch numbered 11 and another active portion 1100 in a second notch numbered 16.

The third section 11B3 is also in series with the other two sections by means of other sections 11B which are not shown. The third section 11B3 comprises an active portion 1100 of each pin in the second notch of the first section numbered 6 and includes an active portion 1100 of each pin in the first notch 100 numbered 11.

Thus in this example, each notch comprises four active portions 1100, more precisely two active portions of one section and two active portions of another section.

In this example, the rotor comprises twenty-one notches 100 and twenty-one conductive strips 21.

The stator comprises two pairs of poles and the brush holder comprises two positive brushes and two negative brushes.

The number X of collector blades is therefore equal to a number Z of notches in the sheet pack. The number of connection areas of the second connection portion is therefore equal to the number Z of notches.

A section 1 IB may have more than two pins, in this case the pins between the first and the second pin comprises only first connection portions connected to each other.

The corrugated winding described can therefore be applied with the three embodiments described above in place of the nested winding.

Naturally, the invention is not limited to the embodiments described with reference to the figures and variants could be envisaged without departing from the scope of the invention.

Claims (1)

Claims [Claim 1] Electric motor for a motor vehicle, in particular for a motor starter comprising: at. a stator (4) comprising a number 2 * p of poles, b. a brush holder comprising positive brushes (+) and negative brushes (-), vs. a rotor comprising: i. a rotation shaft (3) having an axis of rotation (O), ii. a collector (2) comprising: • connected connection zones (211) and isolated connection zones (212), • conductive blades (21) X in number rubbing with the positive brushes (+) and the negative brushes (-) when the rotor turns around of the axis of rotation (O), and in that each of the conductive blades (21) is electrically connected to a corresponding connected connection area (211), iii. a rotor body (1) comprising: • a sheet package (10) comprising axially stacked sheets, the sheet package (10) having a number Z of notches (100) open axially and radially on the outside, • at least one coil (11) comprising winding sections (11A, 11B, 11B1, 11B2, 11B3), each of the sections (11A, 11B, 11B1, 11B2, 11B3) comprising at least two pins (110, 110X, ΠΟΥ, 110B1, 110B2) electrically conductive, each of pins (110, 110X, 110Y, 110B1, 110B2) comprising: • two active portions (1100) each located in a distinct notch (100) among the Z notches (100), • a connecting portion (1101) before forming a bun on an axial side of the sheet pack opposite the collector (2), each connection portion (1101) connecting the two active portions in two different notches (100), • a first connection portion (1102A, 1102AX, 1102A1) located and fixed in one of the isolated connection areas and electrically connected in the isolated connection area to a other first connection portion (1102A, 1102AY, 1102A2) of another pin (110, ΠΟΥ, 110B1, 110B2) of the same section (1 IA, 11B, 11B1, 11B2, 11B3) and • a second connection portion (1102B, 1102BX, 1102B1) located in one of the connected connection areas (211) and connected in the connected connection area (211) to a second connection portion (1102B, 1102BY, 1102B2) of a pin of another section (11, 11A, 11B, 11B1, 11B2, 11B3). [Claim 2] Electric machine according to the preceding claim, in which the isolated connection zones (212) and the connected connection zones (211) are regularly angularly distributed alternately one after the other around the axis of rotation (0) . [Claim 3] Electric machine according to one of claims 1 to 2, in which one of the second connection portions (1102B, 1102BX, 1102B1) located in a connected connection area (211) axially passes through the connected connection area (211 ) and is connected to one of the conductive blades (21) to make the electrical connection between the blade conductive (21) and the connected connection area (211). [Claim 4] An electric machine according to claim 3, wherein the manifold (2) further comprises connecting pieces (23) spaced from the connecting blades (21) by an insulator (20), and in that a connecting piece (23 ) on two forms a connected connection area (211) and the other connection pieces (23) each form an isolated connection area (212). [Claim 5] Electric machine according to one of claims 1 to 2, in which the collector (2) comprises a wall (24) electrically conductive by conductive blade (21), each wall (24) extends radially from the conductive blade (21) corresponding, and an insulator (20) between each wall (24) and in that each wall (24) comprises connection notches forming the connected connection areas (211) and in that each of the second connection portions (1102B, 1102BX, 1102B1) comprises a part in the corresponding connection notch electrically connected by the wall (24) to the corresponding blade (21). [Claim 6] An electric machine according to claim 5, wherein the insulator (20) includes a hole forming the insulated connection areas (212). [Claim 7] Electric machine according to claim 5, in which the collector comprises connectors (22) between the walls (24), the insulation being situated between two walls (24) and a connector (22), the connector (22) comprising a notch forming the isolated connection areas (212). [Claim 8] Electric machine according to one of claims 5 to 7, in which the insulation (20) is overmolded on the conductive strips (21) and between the walls (24) to isolate the strips (21) and walls (24) connected together other adjoining boards (21) and low walls (24). [Claim 9] Electric machine according to one of the preceding claims, in which the winding is a nested winding in which the number of notches (100) between two active portions (1100) connected by a connecting portion (1101) of a pin (110 ) is greater than the number of notches (100) between two active portions (1100) of two different pins (100) connected together by two first connection portions (1102A) and in that the number X of blades is equal to the number Z of connection notches divided by two and the number of brushes is equal to the number of pairs of stator poles (4). [Claim 10] Electric machine according to one of claims 1 to 7, in which the winding is a corrugated winding, in which each pin (110) of the section (1 IB, 1 IB 1, 11B2, 11B3) comprises an active portion (1100) in a first notch (110) of the section (11B, 11B1, 11B2, 11B3) and a second active portion (110) in a second notch (110) of the section (11B, 11B1, 11B2, 11B3) and in that the at least two pins of the section (11B, 11B1, 11B2, 11B3) are connected together by the first connection portions (1102A, 1102A1 , 1102A2) and in which the number X of blades (21) of the collector (2) is equal to Z notches (100) of the sheet pack (10)