Axial flux electric machine with segmented stator, pins and locking means

Abstract

The present invention relates to an axial flux electric machine comprising an outer casing, a stator, and a rotor housed within the outer casing. The stator comprises a yoke (25) and teeth (26) extending longitudinally and substantially regularly distributed around the circumference of the yoke (25). The teeth (26) have longitudinal projections directed towards the yoke (25). The yoke (25) has circumferentially regularly distributed openings for inserting the longitudinal projections. Furthermore, the electric machine comprises pins (28) and at least one locking means for locking the pins (28) so as to secure each of the teeth (26) in the yoke (25) and / or in the outer casing. Each pin (28) preferably passes radially through one of the longitudinal projections. Figure 3 to be published

Description

Title of the invention: Axial flux electric machine with segmented stator, pins and locking means technical field

[0001] The invention relates to the field of axial flux electrical machines and more particularly to a stator for this type of electrical machine.

[0002] This type of axial flux electric machine can find applications in electric or hybrid vehicles, such as cars, buses, trucks, and construction equipment. This type of machine can also be used for stationary applications, such as industrial charging machines or electric generators. Previous technique

[0003] In recent decades, the development of electrical machines has focused primarily on radial flux electrical machines.

[0004] Radial flux electric machines generally comprise a coaxial rotor and stator, one surrounding the other. Thus, the magnetic flux can pass radially from the rotor to the stator and vice versa, via a radial air gap which is defined as the radial clearance between the rotor and the stator.

[0005] On the contrary, axial flux machines are characterized by at least one rotor and at least one stator arranged successively one behind the other in the axial direction (of the rotor's axis of rotation), such that the path of the magnetic flux between the rotor and the stator is axial. In other words, the rotor and the stator face each other and are separated by an air gap of axial thickness (or axial clearance between the rotor and the stator).

[0006] The rotor of axial flux permanent magnet electric machines generally comprises permanent magnets glued to the rotor yoke or inserted into a rotor body and in this case, the permanent magnets are separated by radial arms from the rotor body.

[0007] The stator generally comprises a ferromagnetic stator body, which may or may not have teeth. The electrical winding in the stator slots may be distributed or concentric, i.e., each winding then surrounds a tooth.

[0008] In the context of the development of high power and torque density machines for electric or hybrid traction, particularly for electric or hybrid vehicle applications, axial flux machine topology is among those with the highest potential, notably due to the high constraint axial footprint. Axial flux electrical machines are also of interest for stationary applications as well as for wind power applications.

[0009] In general, axial flux electrical machines allow higher power and torque densities than radial flux electrical machines.

[0010] This gain is generally achievable by increasing the number of pole pairs in the rotor, which increases the rotational frequency as well as the rotor losses (i.e. the losses in the magnets).

[0011] Patent application WO2018 / 167214 A1 relates to a segmented stator for an axial flux electric machine. The stator consists of two types of elements assembled alternately circumferentially. One of the two types of elements serves as stator teeth. The assembly method allows for mounting but requires small functional clearances to ensure the assembly remains correctly positioned. Summary of the invention

[0012] The technical problem consists of improving the segmented stator by simplifying the manufacture and assembly of the stator, while ensuring good positioning of the different elements of the assembly in order to ensure good performance of the electrical machine.

[0013] The invention relates to an axial flux electric machine comprising an outer casing, at least one stator and at least one rotor located within said outer casing, the stator comprising a stator yoke and teeth around which coils are wound, the teeth extending longitudinally and being substantially regularly distributed around the circumference of the yoke, the teeth comprising longitudinal projections in the direction of the yoke, the yoke comprising circumferentially regularly distributed openings allowing the insertion of the longitudinal projections into the openings. Furthermore, the electric machine comprises pins and at least one locking means for locking the pins so as to lock the position of each of said teeth in the yoke and / or in the outer casing, each of said pins passing, preferably in the radial direction, through one of said longitudinal projections.

[0014] Preferably, the outer casing includes cavities for the placement of longitudinal protrusions, pins and preferably at least one locking means in the cavities.

[0015] Advantageously, the pins comprise a first conical end, the outer sheath comprising a conical part to come into contact with said first conical end.

[0016] According to one embodiment of the invention, the pins comprise a second conical end, the electrical machine comprising a clamping ring with a portion conical and a screw placed in the outer casing so as to tighten the conical portion against the second conical end.

[0017] Advantageously, the pins protrude from at least one side of the longitudinal protrusion, preferably from both sides of the longitudinal protrusion.

[0018] According to one configuration of the invention, at least one end of the pins is in direct contact with the outer casing and preferably, at least one locking means includes a shimming means, preferably annular, positioned between the pins and the cylinder head.

[0019] According to one embodiment of the invention, the pins comprise an eccentric portion at one end, the rotation of the pin allowing the axis of the pin to be moved away from the outer casing.

[0020] According to one aspect of the invention, at least one locking means comprises a leaf spring positioned between at least one of said pins and the breech and / or the outer casing.

[0021] Preferably, at least one locking means comprises a flange positioned between at least one of said pins and the cylinder head or outer casing, and a spreading means, preferably at least one piece screwed into the flange, to move the flange away from the cylinder head or outer casing.

[0022] Advantageously, the at least one locking means comprises at least one threaded part positioned at the end of one of said pins, preferably a threaded part, at each of the two ends of the pins, the thread axis being substantially perpendicular to the axis of the pin considered, and a screw is inserted into each thread of the threaded part to move the pin away from the cylinder head or outer casing.

[0023] The invention also relates to a method of assembling the electrical machine according to one of the variants or combinations of variants described in this text, in which the pin is deformed during assembly. List of figures

[0024] Other features and advantages of the electric machine according to the invention will become apparent from the following description of non-limiting examples of embodiments, with reference to the figures attached and described below. [Fig 1]

[0025] Fig. 1 represents an example of an axial flux electric machine with a rotor and two stators according to the invention. [Fig 2]

[0026] Fig. 2 represents a view in a plane orthogonal to the longitudinal axis of an electrical machine according to the invention. [Fig 3]

[0027] Figure 3 represents a first embodiment of an axial flux electric machine according to the invention. [Fig 4]

[0028] Fig. 4 represents a first variant in a view in a plane orthogonal to the radial direction of the first embodiment of an electrical machine according to the invention. [Fig 5]

[0029] Fig. 5 represents a second variant in a developed view of the first embodiment of an electrical machine according to the invention. [Fig 6]

[0030] Figure 6 represents a second embodiment in a developed view of an electrical machine according to the invention. [Fig 7]

[0031] Figure [Fig.7] represents a third embodiment of an electrical machine according to the invention. [Fig 8]

[0032] Figure [Fig.8] represents a fourth embodiment of an axial flux electric machine according to the invention. [Fig 9]

[0033] Figure 9 represents a fifth embodiment of an axial flux electric machine according to the invention. [Fig 10]

[0034] Figure 10 represents a sixth embodiment of an axial flux electric machine according to the invention. [Fig 11]

[0035] Figure 11 represents a seventh embodiment of an axial flux electric machine according to the invention. [Fig 12]

[0036] Fig. 12 represents the locking of the pin according to the seventh embodiment of an axial flux electric machine according to the invention. [Fig 13]

[0037] Figure 13 shows a view in a plane orthogonal to the longitudinal axis of the seventh embodiment of an axial flux electric machine according to the invention. [Fig. 14]

[0038] Figure 14 represents an eighth embodiment of an axial flux electric machine according to the invention. [Fig 15]

[0039] Figure 15 represents a ninth embodiment of an axial flux electric machine according to the invention. Description of the implementation methods

[0040] The terms "vertical", "horizontal", "upper", "lower" are understood to refer to the electrical machine of the invention in an operating condition, "upper" and "lower" being relative to the vertical axis.

[0041] The "longitudinal" direction is the direction of the axis of rotation of the rotor (and shaft) and the electric machine.

[0042] The terms "internal" and "external" are understood relative to each other, the internal term being relatively closer to the axis of rotation than the external term. For example, when a pin is positioned radially with an internal radial end and an external radial end, the external radial end is farther from the axis of rotation than the internal radial end.

[0043] The invention relates to an axial flux electric machine comprising an external casing (also called a "housing"), at least one stator, and at least one rotor. The stator(s) and rotor(s) are housed within said external casing. The rotor is free to rotate about an axis of rotation, referred to as the longitudinal axis of the electric machine.

[0044] The stator comprises a stator head and teeth around which coils are wound. The teeth extend longitudinally and are substantially regularly distributed around the circumference of the head. Furthermore, the teeth include longitudinal projections extending towards the head for insertion into the head, and the head includes regularly distributed circumferential openings allowing the longitudinal projections to be inserted into the openings. The teeth comprise a first portion around which the coils are wound, this first portion terminating at a plane, called the "interface plane," which forms a longitudinal end of the coils at the head. The projections (forming a second portion) advantageously extend longitudinally from the interface plane towards the head.The protrusions extend in the longitudinal direction (from the longitudinal axis of the electric machine) and have a cross-section (without a plane orthogonal to the longitudinal direction) smaller than the cross-section of the first part. Therefore, the protrusions are inserted into the yoke in the longitudinal direction, and the remaining teeth (i.e., the first part around which the coils are wound) extend in the longitudinal direction from the yoke in the opposite direction to the yoke from the interface plane. Thus, this... The part of the teeth not including the protrusions allows the coils to be slid around the teeth.

[0045] The cylinder head connects all the teeth and ensures the stator is mounted. The resulting assembly thus corresponds to a segmented stator.

[0046] The cylinder head can for example be formed from stacked sheets, and the stacked sheets of the cylinder head can advantageously be stacked in the longitudinal direction.

[0047] The teeth can, for example, each be formed by a stack of sheets. The stacking of the sheets of the teeth can advantageously be substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head.

[0048] The rolling of the stacked plates of the cylinder head and teeth allows the electromagnetic flux to be directed to increase performance. The orthogonal direction of the stacking of the cylinder head plates and that of the teeth plates allows for simplified assembly, thus offering a good compromise between electromagnetic performance and assembly time (and cost).

[0049] According to an alternative, each of the teeth could be formed by a single block assembly (as opposed to a stack of sheets).

[0050] According to the invention, the electric machine comprises pins passing through the longitudinal projections of the teeth. The longitudinal projections therefore include through holes for the passage of the pins. These through holes preferably pass completely through both sides of the longitudinal projections (referred to in this text as "projections"). Each pin passes through each of the tooth projections: in other words, the electric machine comprises as many pins as there are projections, and therefore as there are teeth. The electric machine thus comprises one pin in each projection, and therefore in each tooth.

[0051] The term "peg" or "pin" means a rod, preferably rigid, substantially long-sloping (extending substantially in a long-sloping direction) with two opposite ends.

[0052] Furthermore, the electric machine includes at least one locking means for locking the pins, so as to lock the position of each of said teeth in the cylinder head and / or in the outer casing. The locking means locks the position of the pins by displacing the relative position of the pins to the cylinder head and / or the outer casing, for example by moving the pins away from or closer to the cylinder head and / or the outer casing in the longitudinal direction. The relative displacement allows the teeth to be locked in the cylinder head directly or indirectly, by locking the pin in the outer casing and thus locking the cylinder head in the outer casing.

[0053] The at least one locking means may be a single locking means for locking all the pins together. In this case, the locking means may include an annular piece for locking all the pins. Alternatively, the at least one locking means may be used to lock a single pin or several pins simultaneously: for example, the electrical machine may include as many locking means as there are pins when a locking means allows the locking of a single pin, or the electrical machine may include a number of locking means corresponding to half the (even) number of pins when a locking means allows the locking of two pins simultaneously.

[0054] This type of axial flux electric machine is particularly advantageous because it allows the coils to be mounted on the teeth before assembly on the cylinder head, or even to obtain an assembled stator, independent of its mounting in the housing. It also allows for repairs because the locking mechanism enables unlocking without destroying or damaging the stator.

[0055] Preferably, the pins can pass through the longitudinal projections in the radial direction. In other words, the pins are inserted radially when placed in the electrical machine. The holes through the projections are then also radial.

[0056] Advantageously, at least one locking means may be positioned at the inner radial end of the pins (i.e., in a central area) and / or at the outer radial end of the pins (i.e., in a peripheral area). The peripheral area is understood to be an area further away than the central area, the central area being located at the inner radial ends of the pins and the peripheral area being located at the outer radial ends of the pins.

[0057] According to one embodiment of the invention, the outer casing may include cavities for the insertion of the projections, pins, and preferably at least one locking means within the cavities. In other words, the cavities are sufficiently large to allow the insertion of the projections, pins, and, if necessary, the locking means. The number of cavities may advantageously be the same as the number of projections. This configuration allows for the simultaneous locking of each tooth in the cylinder head and of the cylinder head in the outer casing.

[0058] According to one embodiment of the invention, the pins (or dowels or rods) may each comprise a first conical end, and the outer casing may comprise a conical portion for contacting said first end conical. The part of the outer casing being in contact with the first conical end of the pin, the relative radial movement of the pin with the cylinder head or the outer casing causes the pin to tighten in the outer casing (and consequently the cylinder head to tighten in the outer casing).

[0059] Advantageously, the pins may include a second conical end, and the electrical machine may include a clamping ring with a conical portion and a screw positioned in the outer casing so as to clamp the conical portion of the clamping ring against the second conical end. The conical portion of the clamping ring is positioned against the second conical end of the pin. The screw, positioned in the outer casing and preferably longitudinally, tightens the clamping ring, thereby locking the clamping ring against the pin. Thus, the position of the tooth in the outer casing, and consequently the position of the cylinder head in the outer casing, can be locked.

[0060] Advantageously, the pins may protrude from at least one side of the longitudinal protrusion so as to allow the positioning of at least one locking means between the pin and the cylinder head or outer casing.

[0061] Preferably, the pins may protrude on both sides of the longitudinal protrusion. This facilitates locking.

[0062] Alternatively, the pins may protrude from only one side of the longitudinal protrusion.

[0063] According to one embodiment of the invention, at least one end of the pins can be in direct contact with the outer casing, and preferably a shimming (or clamping) means, preferably annular, can be positioned between the pins and the cylinder head. The shimming means serves as a locking means. In particular, it can be press-fitted to ensure that the pin is locked in the outer casing.

[0064] The shimming means (or clamping means) can be a shim and we can then have a shim between each pin, and the outer envelope or the shimming means (or clamping means) can be a ring which allows shimming between all the pins and the outer envelope.

[0065] According to one embodiment of the invention, the pins may include an eccentric portion at one end. Rotating the pin moves its axis away from the outer casing. Thus, rotating the pin locks it in the outer casing and consequently locks the cylinder head in the outer casing. Rotating it in the opposite direction unlocks the assembly. The locking means ensures that the pin remains in position. Total locking of the tooth can be achieved, for example, by a clamping ring or by clamps on the inner part of the pin.

[0066] According to one embodiment of the invention, at least one locking means may include a leaf spring positioned between at least one of said pins and the breechblock and / or the outer casing. The leaf spring allows the pin to be moved away from the breechblock or the outer casing to lock the assembly.

[0067] According to this embodiment: - the locking means may include a leaf spring between each pin and the breech or outer casing: there are then as many leaf springs as there are pins. - the locking means may include a leaf spring for two pins: there are then twice as many pins as leaf springs. - the locking means may include a leaf spring for more than two pins. - the locking means may include a single leaf spring for all the pins.

[0068] The choice can be made, for example, according to the diameter of the electrical machine, the type and characteristics of the leaf springs.

[0069] This type of axial flux electric machine with a locking mechanism comprising a leaf spring is particularly advantageous because it allows for the assembly of a stator, independent of its mounting in the housing. Furthermore, the presence of the spring keeps the tooth pressed against the housing, regardless of temperature and expansion of the parts. It also allows for repairs without damaging the stator, as disassembly is possible.

[0070] When the locking means comprises a single leaf spring, the leaf spring can extend around the entire perimeter to allow all the pins to be locked at once. In other words, the leaf spring is then continuous around its entire circumference.

[0071] According to one embodiment of the invention, at least one locking means may comprise a flange positioned between at least one of said pins and the cylinder head or outer casing, and a spreading means, preferably at least one part screwed into the flange, for moving the flange away from the cylinder head or outer casing. The spreading means allows modification of the relative position between the flange and the cylinder head or outer casing, so as to lock or unlock the position of the pins.

[0072] For example, a flange can be put in place for each pin: in this case, the locking means includes as many flanges and spacing means as there are pins. Alternatively, a clamp can be installed for several pins, preferably for two pins, to offer a good compromise between limitation The number of parts, ease of assembly, and mounting options are all factors to consider. In this case, the number of clamps for the locking mechanism depends on the number of pins per clamp. If the clamp is used for two pins, then there are twice as many pins as clamps, for example. This variation reduces assembly time, limits the number of parts in the assembly, and simplifies assembly.

[0073] According to one embodiment of the invention, at least one locking means may comprise at least one threaded part positioned at the end of one of said pins, the thread axis being substantially perpendicular to the axis of the pin in question, and a screw may be inserted into the thread of the threaded part to move the pin away from the cylinder head or the outer casing. The threaded part extends in a direction substantially orthogonal to the direction of the pin. The tightening / loosening of the screw in the threaded part allows the pin to be locked in the cylinder head or the outer casing. For example, the screws bear against the outer casing, pull the threaded parts, which in turn pull the pins against the tooth on the cylinder head and the cylinder head against the outer casing.

[0074] Preferably, at least one locking means may include a threaded part at each end of each pin and a screw in each thread of each threaded part. This allows control of the position of the two ends of the pins and thus improves the locking of the assembly.

[0075] The invention also relates to a method of assembling the electrical machine according to one of the variants or combinations of variants described in this text, in which the pin is deformed during assembly.

[0076] Fig. 1 illustrates, schematically and not in a limiting way, an example of an axial flux electric machine according to the invention.

[0077] The electric machine comprises a rotor 1 and two stators 100, one on each side of the rotor 1.

[0078] The rotor 1 rotates around an axis of rotation A represented by the dashed line.

[0079] The rotor comprises permanent magnets 4 that pass completely through the rotor 1 to to be opposite a stator 100 on each side. Thus, the axial footprint of the electric machine is reduced.

[0080] The rotor 1 and the stators 100 are placed in an external casing 18 (also called a "housing").

[0081] Fig. 2 illustrates, schematically and not in a limiting manner, an embodiment of an axial flux electric machine according to the invention.

[0082] The diagram illustrates the electric machine in a plane orthogonal to the longitudinal axis.

[0083] The electric machine comprises a casing 18, a central shaft 7 (with a non-rotor represented) as well as a stator comprising stator teeth 26 and coils 27. The Coils 27 surround the stator teeth 26. The stator teeth 26 are mounted on a yoke (not shown), so as to form a segmented stator.

[0084] Fig. 3 illustrates, schematically and not in a limiting manner, a first embodiment of an axial flux electric machine according to the invention.

[0085] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0086] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0087] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0088] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0089] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0090] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0091] As can be seen in the figure, the breechblock includes openings for inserting the longitudinal projections of the teeth. Here the openings are through-holes and the projections pass completely through the breechblock 25.

[0092] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one end to the other. The pins 28 protrude from both ends of the teeth 26. The pins can, for example, extend in the radial direction from an inner radial end to an outer radial end.

[0093] A locking means comprising here leaf springs 29 is provided. The leaf springs 29 are positioned between the pins 28 and the breechblock 25 to lock the longitudinal position of the pins relative to the breechblock.

[0094] Fig. 4 illustrates, schematically and without limitation, a first variant of the first embodiment of an axial flux electric machine according to the invention.

[0095] This figure is located in a longitudinal plane passing through a direction orthogonal to the radial direction passing through a pin 28.

[0096] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0097] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0098] The teeth 26 are each formed by a stack of sheets. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0099] The teeth 26 include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0100] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0101] The breech 25 includes openings (not visible) for inserting the longitudinal projections 31 of the teeth 26. Here the openings are through and the longitudinal projections 31 pass completely through the breech 25.

[0102] Furthermore, pins 28 here pass completely through the longitudinal projections 31 of the teeth 26, from one end to the other. The pins 28 protrude from at least one end (and preferably from both ends) of the teeth 26. The pins 28 can, for example, extend in the radial direction (orthogonal to the figure) from an internal radial end to an external radial end.

[0103] A locking means comprising here leaf springs 29 is provided. The leaf springs 29 are positioned between the pins 28 and the breechblock 25 to lock the longitudinal position of the pins 28 relative to the breechblock 25.

[0104] Furthermore, the tooth 26 here includes a partial closure of notch 30 in order to facilitate the winding of coils around the teeth 26.

[0105] Fig. 5 illustrates, schematically and not in a limiting manner, a second variant of the first embodiment of an axial flux electric machine according to the invention.

[0106] This figure represents a developed view in a longitudinal direction and in a direction orthogonal to the radial direction of the pins 28.

[0107] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0108] The cylinder head 25 is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0109] The teeth 26 are each formed by a stack of sheets. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0110] The teeth 26 include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0111] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0112] The breech 25 includes openings (not visible) for inserting the longitudinal projections 31 of the teeth 26. Here the openings are through and the longitudinal projections 31 pass completely through the breech 25.

[0113] Furthermore, pins 28 here pass completely through the longitudinal projections 31 of the teeth 26, from one end to the other. The pins 28 protrude from at least one end (and preferably from both ends) of the teeth 26. The pins 28 can, for example, extend in the radial direction (orthogonal to the figure) from an internal radial end to an external radial end.

[0114] A locking means comprising leaf springs 29 is provided. The leaf springs 29 are positioned between the pins 28 and the breechblock 25 to lock the longitudinal position of the pins 28 relative to the breechblock 25. Here, a single leaf spring locks the position of two pins 28 relative to the breechblock 25, thus reducing the number of leaf springs required.

[0115] Furthermore, the tooth 26 here includes a partial closure of notch 30 in order to facilitate the winding of coils around the teeth 26.

[0116] Figure 6 illustrates, schematically and not in a limiting manner, a second embodiment of an axial flux electric machine according to the invention.

[0117] This figure represents a developed view in a longitudinal direction and in a direction orthogonal to the radial direction of the pins 28.

[0118] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0119] The cylinder head 25 is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0120] The teeth 26 are each formed by a stack of sheets. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0121] The teeth 26 include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0122] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0123] The breech 25 includes openings (not visible) for inserting the longitudinal projections 31 of the teeth 26. Here the openings are through and the longitudinal projections 31 pass completely through the breech 25.

[0124] Furthermore, pins 28 here pass completely through the longitudinal projections 31 of the teeth 26, from one end to the other. The pins 28 protrude from at least one end (and preferably from both ends) of the teeth 26. The pins 28 can, for example, extend in the radial direction (orthogonal to the figure) from an internal radial end to an external radial end.

[0125] A locking means comprising flanges 32 is provided. The flanges are positioned between the pins 28 and the cylinder head 25 to lock the longitudinal position of the pins 28 relative to the cylinder head 25. Here, a single flange can lock the position of two pins 28 relative to the cylinder head 25, thus reducing the number of flanges required.

[0126] To ensure the locking or unlocking of the flanges 32, screws 33, extending substantially in the longitudinal direction, are inserted into the flange up to the cylinder head 25.

[0127] Furthermore, the tooth 26 here includes a partial notch closure 30 to facilitate the winding of the coils around the teeth 26. The partial notch closure 30 is located at the longitudinal end of the tooth opposite the protrusion and it extends in the radial direction to hold coils in position and prevent them from slipping towards the rotor (or into the air gap).

[0128] Figure 7 illustrates, schematically and not in a limiting manner, a third embodiment of an axial flux electric machine according to the invention.

[0129] This figure represents a view in a longitudinal plane passing through a direction orthogonal to the radial direction of the pins 28.

[0130] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0131] The cylinder head 25 is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0132] The teeth 26 are each formed by a stack of sheets. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0133] The teeth 26 include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0134] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0135] The breech 25 includes openings (not visible) for inserting the longitudinal projections 31 of the teeth 26. Here the openings are through and the longitudinal projections 31 pass completely through the breech 25.

[0136] Furthermore, pins 28 here pass completely through the longitudinal projections 31 of the teeth 26, from one end to the other. The pins 28 protrude from at least one end (and preferably from both ends) of the teeth 26. The pins 28 can, for example, extend in the radial direction (orthogonal to the figure) from an internal radial end to an external radial end.

[0137] A locking means comprising flanges 32 is provided. Each flange is positioned between each pin 28 and the breech 25 to lock the longitudinal position of each pin 28 relative to the breech 25. Here, a single flange locks the position of only one pin 28 relative to the breech 25, thus improving the locking accuracy of each pin.

[0138] To ensure the locking or unlocking of the flanges 32, two screws 33, extending substantially in the longitudinal direction, are inserted into each flange 32 up to the cylinder head 25. The two screws 33 are located on either side of the protrusion 31.

[0139] Furthermore, the tooth 26 here includes a partial notch closure 30 to facilitate the winding of the coils around the teeth 26. The partial notch closure 30 is located at the longitudinal end of the tooth opposite the protrusion and it extends in the radial direction to hold coils in position and prevent their slippage towards the rotor (or into the air gap).

[0140] Figure 8 illustrates, schematically and not in a limiting manner, a fourth embodiment of an axial flux electric machine according to the invention.

[0141] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0142] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0143] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 stack in the longitudinal direction.

[0144] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0145] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0146] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0147] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25.

[0148] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one side to the other. The pins 28 protrude from both ends of the teeth 26. The pins 28 can, for example, extend in the radial direction from an internal radial end to an external radial end.

[0149] A locking means comprising threaded parts 34 and screws 35 is provided. The threaded parts are positioned at each end of each pin 28 and in a direction substantially orthogonal to the direction of the pins 28. The threads in the threaded parts are substantially orthogonal to the direction of the pins; therefore, the threads in the threaded parts are preferably substantially longitudinal. The screws 35 are inserted into the threads in the threaded parts and also pass through the outer casing 18. A portion of the outer casing is positioned between the cylinder head 25 and the threaded part to ensure locking or unlocking, and thus the simultaneous locking of the tooth's position relative to the cylinder head and of the cylinder head 25 relative to the outer casing 18.

[0150] In addition, the outer casing 18 includes cavities 36 for the insertion of the longitudinal protrusions of the teeth 26, the pins 18 and the locking means (here the threaded parts 34 and the screws 35).

[0151] Figure 9 illustrates, schematically and not in a limiting manner, a fifth embodiment of an axial flux electric machine according to the invention.

[0152] This figure represents a view in a longitudinal plane passing through a direction orthogonal to the radial direction of the pins 28.

[0153] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0154] The cylinder head 25 is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0155] The teeth 26 are each formed by a stack of sheets. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0156] The teeth 26 include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0157] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0158] The breech 25 includes openings (not visible) for inserting the longitudinal projections 31 of the teeth 26. Here the openings are through and the longitudinal projections 31 pass completely through the breech 25.

[0159] Furthermore, pins 28 here pass completely through the longitudinal projections 31 of the teeth 26, from one end to the other. The pins 28 protrude from at least one end (and preferably from both ends) of the teeth 26. The pins 28 can, for example, extend in the radial direction (orthogonal to the figure) from an internal radial end to an external radial end.

[0160] Here, the outer envelope 18 includes cavities 36 for the placement of the longitudinal projections 31 of the teeth 26, the pins 28 and the locking means (not shown).

[0161] Furthermore, the tooth 26 here includes a partial notch closure 30 to facilitate the winding of the coils around the teeth 26. The partial notch closure 30 is located at the longitudinal end of the tooth opposite the protrusion and it extends in the radial direction to hold coils in position and prevent their slippage towards the rotor (or into the air gap).

[0162] Fig. 10 illustrates, schematically and not in a limiting manner, a sixth embodiment of an axial flux electric machine according to the invention.

[0163] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0164] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0165] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0166] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0167] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0168] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly smaller than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to longitudinally distinguish the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the opposite direction to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0169] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25.

[0170] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one end to the other. The pins 28 protrude from both ends of the teeth 26. The pins 28 can, for example, extend in the radial direction from an internal radial end to an external radial end.

[0171] Each pin 28 here comprises a first conical end 37 and a second conical end 40.

[0172] The first conical end 37 of each pin 28 is in contact with a conical portion 38 on the outer sleeve 18, and the second conical end 40 of each pin is in contact with a conical portion 39 of the clamping ring. Furthermore, a clamping screw 41 inserted into the clamping ring and into the outer sleeve 18, and extending substantially longitudinally, allows the position of the pin 28 to be locked in the outer sleeve 18, thus simultaneously locking the tooth 26 in the cylinder head 25 and locking the cylinder head 25 in the outer sleeve 18.

[0173] The clamping screw is not necessarily in the same plane as the pin, but it may be in a plane located between two successive pin planes, as illustrated in [Fig. 13].

[0174] As an alternative to the clamping ring, it is possible to use multi-element clamping solutions.

[0175] In addition, the outer casing 18 includes cavities 36 for the insertion of the longitudinal protrusions of the teeth 26, the pins 18 and the locking means (here the clamping ring with the conical portions 39 and the screws 41).

[0176] Fig. 11 illustrates, schematically and not in a limiting manner, a seventh embodiment of an axial flux electric machine according to the invention.

[0177] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0178] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0179] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 stack in the longitudinal direction.

[0180] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the cylinder head sheets 25.

[0181] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0182] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0183] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25.

[0184] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one end to the other. The pins 28 protrude from only one end of the teeth 26. The pins 28 can, for example, extend in the radial direction from an internal radial end to an external radial end.

[0185] Each pin 28 protrudes from the longitudinal projections on only one side.

[0186] The pin 28 is in contact with the outer casing 18.

[0187] Before the insertion of the locking means, as shown in this figure, the pin 28 is offset with respect to the radial direction. To achieve this, the opening 42 in the tooth protrusion for the passage of the pin 28 is significantly larger than the diameter of the pin 28.

[0188] In addition, the outer casing 18 includes cavities 36 for the insertion of the longitudinal projections of the teeth 26, the pins 28 and the locking means (not shown).

[0189] As an alternative to the solution shown in this figure, the bore could be adjusted to the diameter of the pin and the assembly could be inclined for mounting before tightening into position.

[0190] Fig. 12 illustrates, schematically and not in a limiting manner, the locking of the pin according to the seventh embodiment of an axial flux electric machine according to the invention, of Fig. 11.

[0191] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0192] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0193] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 stack in the longitudinal direction.

[0194] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0195] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0196] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0197] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25.

[0198] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one end to the other. The pins 28 protrude from only one end of the teeth 26. The pins 28 can, for example, extend in the radial direction from an internal radial end to an external radial end.

[0199] Each pin 28 protrudes from the longitudinal projections on only one side.

[0200] The pin 28 is in contact with the outer casing 18.

[0201] This figure, unlike [Fig. 11], illustrates the assembly after the locking means have been inserted. Whereas in [Fig. 11] the pin 28 is offset from the radial direction before the locking means are inserted, here a portion of the pin passing through the protrusion of the tooth 26 is substantially radial. The deformation of the pin 28 between the diagram in [Fig. 11] and that in [Fig. 12] is due to the insertion of a clamping ring 43 between the pin 28 and the cylinder head 25, which is clamped by screws (not shown), thus enabling locking.

[0202] As an alternative to the solution shown in this figure and in [Fig.1 1], the bore could be adjusted to the diameter of the pin and the tooth+pin assembly could be inclined (instead of the inclination of the pin alone in the bore as seen in [Fig.1 1]) for assembly before tightening into position, the tightening causing the deformation of the pin as seen in [Fig. 12].

[0203] In addition, the outer casing 18 includes cavities 36 for the insertion of the longitudinal projections of the teeth 26, the pins 18 and the locking means (bridging ring 43).

[0204] Fig. 13 represents, schematically and not in a limiting manner, a view in a plane orthogonal to the longitudinal axis of the seventh embodiment of an axial flux electric machine according to the invention.

[0205] The locking means comprises the clamping ring 43 and the pins 28 of the various teeth (not shown for ease of understanding). The pins 28 extend substantially radially. To lock the pins 28 in the outer casing, screws 44 are regularly positioned to tighten the clamping ring 43 so as to lock the position of the pins 28 on the outer casing.

[0206] The screws 44 can advantageously be placed between two successive pins 28 and positioned substantially equidistant from these two successive pins 28.

[0207] Alternatively, the assembly could be reversed, i.e., include an outer ring rather than an inner ring.

[0208] Fig. 14 illustrates, schematically and not in a limiting manner, an eighth embodiment of an axial flux electric machine according to the invention.

[0209] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0210] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0211] The cylinder head 25 is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0212] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0213] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0214] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly smaller than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to longitudinally distinguish the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the opposite direction to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0215] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25.

[0216] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one end to the other. The pins 28 protrude from both ends of the teeth 26. The pins 28 can, for example, extend in the radial direction from an internal radial end to an external radial end.

[0217] Each pin 28 protrudes from longitudinal projections on both sides.

[0218] One end of the pins 28 includes an eccentric portion 45 opposite and in contact with the outer casing 18, such that by rotating the pin 28 about its axis, the axis of the pin can be moved away from or closer to the outer casing 18 and the cylinder head 25.

[0219] The axis of the pin is represented by the dashed line A2, while the dashed line Al represents the axis of the bore. The effect of the eccentric, which offsets the axis of the pin A2 from the axis of the bore AL, can be seen here.

[0220] The other end of the pin 28 is brought into contact with a clamping ring 43 (which can correspond substantially to that of [Fig. 13]) to lock the pin 28 in the outer casing 18 and in the cylinder head 25. To achieve this locking, screws 44, like those described in [Fig. 13], are placed in the clamping ring 43 and in the outer casing 18, between the pins 28.

[0221] Fig. 15 illustrates, schematically and not in a limiting manner, a ninth embodiment of an axial flux electric machine according to the invention.

[0222] This figure is located in a longitudinal plane passing through a radial direction passing through a pin 28.

[0223] The stator of this electric machine comprises a yoke 25 and teeth 26 which extend substantially longitudinally (in the vertical direction in the diagram).

[0224] The cylinder head is formed from stacked sheets, which is represented by the parallel lines of the cylinder head 25. The stacked sheets of the cylinder head 25 are stacked in the longitudinal direction.

[0225] The teeth 26 are each formed by a stack of sheets, which is represented by the parallel lines of the teeth 26. The stacking of the teeth is substantially in the radial direction, therefore orthogonal to the direction of the stacking of the sheets of the cylinder head 25.

[0226] The teeth include longitudinal outgrowths 31 which start at the interface plane 51 forming a longitudinal end of the coils in contact with the cylinder head 25.

[0227] The cross-section (in a plane orthogonal to the longitudinal direction) of the protrusions 31 is strictly less than the cross-section of the first part 52 of the teeth around which the coils are wound, the interface plane 51 serving to distinguish longitudinally the first part 52 of the protrusions 31, the first part 52 extending from the interface plane 51 in the direction opposite to the cylinder head 25 while the protrusions 31 extend from the interface plane 51 in the direction of the cylinder head 25.

[0228] As can be seen in the figure, the breech 25 includes openings for inserting the longitudinal projections of the teeth. Here the openings are through and the projections pass completely through the breech 25, without protruding beyond it on the side opposite the teeth.

[0229] Furthermore, pins 28 here pass completely through the projections of the teeth 26, from one side to the other, and also pass completely radially through the cylinder head. The pins 28 protrude from both ends of the teeth 26 and from both radial ends of the cylinder head 25. The pins 28 can, for example, extend in the radial direction from an inner radial end to an outer radial end.

[0230] Each pin 28 here comprises a first conical end 37 and a second conical end 40.

[0231] The first conical end 37 of each pin 28 is in contact with a conical portion 38 on the outer sleeve 18, and the second conical end 40 of each pin is in contact with a conical portion 39 of the clamping ring. Furthermore, a clamping screw 41 inserted into the clamping ring and into the outer sleeve 18, and extending substantially longitudinally, allows the position of the pin 28 to be locked in the outer sleeve 18, thus simultaneously locking the tooth 26 in the cylinder head 25 and locking the cylinder head 25 in the outer sleeve 18.

[0232] Of course, the invention is not limited to the embodiments presented but includes all variants and combinations of variants of these embodiments, as long as they remain technically compatible with each other.

Claims

Demands

1. An axial flux electric machine comprising an outer casing (18), at least one stator (100) and at least one rotor (1) placed in said outer casing (18), the stator (100) comprising a stator yoke (25), teeth (26) around which coils (27) are wound, the teeth (26) extending longitudinally and being substantially regularly distributed around the circumference of the yoke (25), the teeth (26) comprising longitudinal projections (31) in the direction of the yoke (25), the yoke (25) comprising circumferentially regularly distributed openings allowing the longitudinal projections (31) to be inserted into the openings, characterized in that the electric machine comprises pins (28) and at least one locking means for locking the pins (28) so as to lock the position of each of said teeth (26) in the yoke (25) and / or in the outer envelope (18),each of said pins (28) passing, preferably in the radial direction, through one of said longitudinal projections (31).

2. Electric machine according to claim 1, characterized in that the outer casing (18) includes cavities (36) for the placement of longitudinal protrusions (31), pins (28) and preferably at least one locking means in the cavities (36).

3. Electric machine according to any one of the preceding claims, characterized in that the pins (28) comprise a first conical end (37), the outer casing (18) comprising a conical part (38) to come into contact with said first conical end (37).

4. Electric machine according to the preceding claim, characterized in that the pins (28) comprise a second conical end (40), the electric machine comprising a clamping ring with a conical portion (39) and a screw (41) placed in the outer casing (18) so as to clamp the conical portion (39) against the second conical end (40).

5. An electrical machine according to any one of the preceding claims, characterized in that the pins (28) protrude by at least one side of the longitudinal outgrowth (31), preferably on both sides of the longitudinal outgrowth (31).

6. Electric machine according to any one of the preceding claims, characterized in that at least one end of the pins (28) is in direct contact with the outer casing (18) and preferably in that at least one locking means includes a wedging means, preferably annular, positioned between the pins (28) and the cylinder head (25).

7. An electric machine according to any one of the preceding claims, characterized in that the pins (28) comprise an eccentric portion (45) at one end, the rotation of the pin (28) allowing the axis of the pin (28) to be moved away from the outer casing (18).

8. Electric machine according to any one of the preceding claims, characterized in that at least one locking means comprises a leaf spring (29) positioned between at least one of said pins (28) and the cylinder head (25) and / or the outer casing (18).

9. An electric machine according to any one of the preceding claims, characterized in that at least one locking means comprises a flange (32) positioned between at least one of said pins (28) and the cylinder head (25) or the outer casing (18), and a spreading means, preferably at least one piece screwed (33) into the flange, to move the flange (32) away from the cylinder head (25) or the outer casing (18).

10. An electric machine according to any one of the preceding claims, characterized in that at least one locking means comprises at least one threaded part (34) positioned at the end of one of said pins (28), preferably a threaded part (34) at each of the two ends of the pins (28), the thread axis being substantially perpendicular to the axis of the pin (28) considered, and in that a screw (35) is inserted into each thread of the threaded part (34) to move the pin (28) away from the cylinder head (25) or the outer casing (18).

11. Method of assembling the electrical machine according to any one of the preceding claims, wherein the pin (28) is deformed during assembly.

Images