Current detection assembly and motor block including such a detection assembly.

Abstract

Current detection assembly (9) comprising a current-conducting bar (11) and a sensor (10) for attachment to the current-conducting bar (11), the sensor comprising a current detection unit (14) including a housing (17) for receiving a magnetic detection means (15), a support means comprising a first and second contact surface, when the sensor (10) is attached to the current-conducting bar (11), the magnetic detection means (15) and the current-conducting bar are disposed respectively between the first and second contact surfaces (19, 20), the support means clamping between the first and second contact surfaces (19, 20), the magnetic detection means (15) and the current-conducting bar (11), in order to hold the detection unit (14) in position against the current-conducting bar (11). Figure for the abbreviation: Fig. 1.

Description

Title of the invention: Current detection assembly and motor block comprising such a detection assembly.

[0001] The present invention relates to the technical field of non-contact current detection, and more particularly to current detection assemblies in conductive bars, especially for applications in electric vehicle motorization. The application also relates to techniques for detecting currents in conductive bars.

[0002] Throughout the rest of this text, the term “current conductive bar”, or “conductive bar”, “busbar”, means a component extending substantially in length, and made of a conductive material such as a metallic material, for example copper, brass or aluminium.

[0003] Nowadays, current detection is of increasing importance, particularly in the context of the development of electric motorization of electric vehicles.

[0004] The invention relates to the technical field of transport, in particular transport by electric vehicle, especially the automobile.

[0005] It is known to use voltage converters in electric vehicle motors. Thus, a traction inverter is generally used, which converts the direct current supplied by high-voltage batteries into the alternating current required by the electric motor to provide the torque necessary for the vehicle's movement. The current output from the inverter is then transmitted via current bars to the motor phases.

[0006] Such an inverter is arranged within an inverter module. The inverter module provides protection for the components against both shocks and solid and liquid particles.

[0007] With such an inverter, it is possible to modulate and control the current output from the inverter, which allows the torque exerted by the motor to be varied. Therefore, torque control requires current measurement.

[0008] Typically, the inverter module includes a means for detecting current flowing in a current-conducting bar, by means of a magnetic sensor.

[0009] Reference is made to [Fig. 1] representing a current measuring device 1 according to the prior art. Such a measuring device 1 comprises at least one Hall effect detection unit 2 arranged opposite a busbar 3. The Hall effect detector 2 comprises a support 4 having a slot 5 for receiving a printed circuit board 6. The location 5 is then coated with a thermoplastic resin (not visible in the figure) in order to immobilize the printed circuit 6 within the support, to guarantee the sealing of the location 5 against solid or liquid particles and also to ensure protection of the electronic circuit 6 against mechanical shocks.

[0010] Such a detection unit 2 is made as follows. The support 4 is first molded directly onto the current-conducting bar 3, then the electronic circuit 6 is placed within the slot 5 of the support 4 and secured, for example, by screwing. A layer of resin, for example a thermoplastic resin, is poured over the assembly to ensure the sealing of the detection unit 2.

[0011] Such a detection unit 2 performs satisfactorily. However, the overmolding of the support 4 onto the current-conducting bar is a limiting factor. Indeed, certain types of electrical conductors, for example, conductive bars comprising several metallic layers separated by dielectric materials, have a cross-section that is too large to allow such overmolding.

[0012] Furthermore, because of the integration of the detection unit within a sealed inverter module, it is unnecessary to add an additional resin to seal the current detection means on a current-conducting bar.

[0013] Document EP 2381264 B1 (Yazaki) describes an assembly structure for a sensing device comprising a current-conducting bar with two holes, and a sensor body equipped with a magnetic sensing element. The body has protruding pins on its lower surface, designed to be inserted into the holes of the current-conducting bar. The ends of these pins are thermoformed to allow the sensor to be held in position against the current-conducting bar. Furthermore, the magnetic sensing element is embedded in a resin to allow it to be bonded to the body.

[0014] Such a sensor still requires the use of resin to allow the magnetic sensing element to be fixed. Furthermore, adjusting the sensing cell and calibrating the assembly is not easily achievable, since the sensing device cannot be placed on the current-conducting bar simultaneously.

[0015] The invention aims to address the aforementioned drawbacks.

[0016] A first objective is to propose an easy current detection system to be implemented, and having a reduced cost of acquisition compared to prior art devices.

[0017] A second objective is to propose such a detection set which can be calibrated quickly and easily.

[0018] A third object is to propose such an assembly suitable for being positioned on current-conducting bars having dimensions greater than those permitted by prior art devices.

[0019] According to a first aspect, a current detection assembly is proposed comprising a current-conducting bar and a sensor intended to be attached to the current-conducting bar, the sensor comprising a current detection unit including a housing intended to receive a magnetic detection means, a support means comprising a first contact surface and a second contact surface, when the sensor is attached to the current-conducting bar, the magnetic detection means and the current-conducting bar are disposed respectively between the first contact surface and the second contact surface, the support means clamping between the first contact surface and the second contact surface, the magnetic detection means and the current-conducting bar, in order to maintain the current detection unit in position against the current-conducting bar.

[0020] Various complementary features may be provided alone or in combination: - the current-conducting bar comprises a first support face and a second support face in opposition to each other, the current-conducting bar being provided with a female connection means passing through the support faces, the support means comprising a plate, a male connection means projecting from the plate, when the sensor is attached to the current-conducting bar, the detection unit is supported on the first support face, the male connection means being inserted into the female connection means and comprising a stop means coming into contact with the second support face, the stop means being positioned so as to keep the first support face pressed against the detection unit; - the male connection means includes at least one rod, the female connection means includes at least one hole, the stopping means being removable; - the male connection means includes at least one rod, the female connection means includes at least one hole, the stopping means being made of the material of the male connection means; - the stopping mechanism is a ferrule formed at the end of the stem; - the male connection means comprises two rods; when the sensor is attached to the current-conducting bar, the two rods are positioned on either side of the housing; - the housing is equipped with a stop within a cavity, the stop incorporating a third contact surface, the magnetic detection means comprising an orifice allowing to receive a centering means, when the sensor is attached to the current conducting bar, the magnetic detection means being held in position within the cavity by being sandwiched between the first contact surface and the third contact surface; - the magnetic detection means includes a connecting pin, when the sensor is attached to the current-conducting bar, the connecting pin incorporates a raised part, a flat part and a lowered part, the raised part and the lowered part each being connected to the flat part by a fold; - when the sensor is attached to the current-conducting bar, the flat part is sandwiched between the cover and the housing, the raised part extending within a lug; - the support means includes a first impression made within an internal face of the cover, and a second impression formed within the connecting pin, projecting from the cover, the first impression and the second impression being able to form a guide for respectively the flat part and the raised part; - the current-conducting bar comprises two peripheral portions defining a rectangular section, and a central portion comprising at least one notch.

[0021] According to a second aspect, an electric motorization block is proposed comprising a current detection assembly as presented above, and an inverter, the current detection assembly being arranged upstream of the inverter.

[0022] Advantageously, the inverter is powered by an electrical source, the inverter being connected to the electrical source through an inverter power supply circuit.

[0023] Advantageously, the electric motorization unit comprising an electric motor having three or six poles, each of them being supplied by an electric motor supply circuit in which a current flows, each of the currents flowing in a supply circuit having a different phase, at least two motor supply circuits being provided with a detection assembly as shown above.

[0024] Other features and advantages of the invention will become more apparent and concrete upon reading the following description of embodiments, given by way of non-limiting example, and made with reference to the accompanying drawings in which:

[0025] [Fig-1] [Fig.1] schematically illustrates an exploded view of a sensor according to prior art;

[0026] [Fig.2] [Fig.2] is a block diagram of a motor unit comprising an inverter, a motor, the current at the motor input being measured by means of a detection set;

[0027] [Fig.3] [Fig.3] schematically illustrates an exploded perspective view of a first embodiment of the detection assembly;

[0028] [Fig.4] [Fig.4] schematically illustrates a perspective view of a detection set according to the first embodiment;

[0029] [Fig.5] [Fig.5] schematically illustrates a perspective view of the detection set of [Fig.3], but represented in a different orientation;

[0030] [Fig.6] [Fig.6] schematically illustrates a cross-sectional view along the section plane VI-VI of the detection assembly according to the first embodiment;

[0031] [Fig.7] [Fig.7] schematically illustrates a cross-sectional view along the section plane VII-VII of the figure;

[0032] [Fig.8] [Fig.8] schematically illustrates in perspective a support means and an electronic circuit of the detection assembly according to the first embodiment;

[0033] [Fig.9] [Fig.9] schematically illustrates an exploded perspective view of a second embodiment of the detection assembly;

[0034] [Fig. 10] the [Fig. 10] schematically illustrates a perspective view of a detection set according to the second embodiment;

[0035] [Fig. 11] [Fig. 11] schematically illustrates a cross-sectional view along the section plane XI-XI of the detection assembly according to the second embodiment;

[0036] [Fig. 12] [Fig. 12] schematically illustrates a cross-sectional view along the cutting plane XII-XII of [Fig.11];

[0037] [Fig. 13] [Fig. 13] schematically illustrates a perspective view of a cover of the detection assembly according to the second embodiment;

[0038] [Fig. 14] [Fig. 14] schematically illustrates a perspective view of a cover equipped with a magnetic detection means and a connection pin;

[0039] [Fig. 15] [Fig. 15] schematically illustrates a perspective view of a housing for the detection assembly according to the second embodiment.

[0040] Reference is made to [Fig.2] representing an engine block 7 of a vehicle (not shown in the figures) comprising a current converter, for example an inverter 8. The engine block 7 includes a current detection assembly 9. Such a current detection assembly 9 is referred to as the detection assembly in the remainder of this text.

[0041] As can be seen in the figures, the detection assembly 9 is equipped with a sensor 10 positioned, attached to a conductive bar 11. Such a sensor 10 makes it possible to detect the current flowing within the conductive bar 11.

[0042] Advantageously, and more specifically, the motor block 7 comprises an electric motor 12 delivering a torque co. The motor block 7 includes power supply poles 13 for supplying power to the electric motor 12. There are three or six such poles 13, connected to conductive bars distributing an electric current, each with a different phase. To enable the operation of the electric motor 12, at least two of the power supply conductive bars 11 are equipped with a sensor 10. In other words, the motor block 7 incorporates two current sensing assemblies 9, each connected to a different pole 13.

[0043] Advantageously, the electric motorization unit comprises an electric motor 12 having three or six poles 13, each of them being supplied by a power supply circuit of the electric motor 74 in which a current flows, each of the currents flowing in a power supply circuit having a different phase, at least two power supply circuits of the motor 74 being provided with a detection assembly 9.

[0044] As shown in [Fig.2], the inverter 8 is powered by an electrical source E, the inverter 8 being connected to the electrical source via an inverter power supply circuit 73, and at the output connected to an inverter output circuit 72.

[0045] In the embodiment shown, the inverter output circuit 72 includes a conductive bar 11 equipped with a sensor 10. In other words, a detection assembly 9 is arranged downstream of the inverter 8, and measures the current in the inverter output circuit 8.

[0046] In an embodiment not shown, the inverter input circuit 73 includes a conductive bar 11 equipped with a sensor 10. In other words, a detection assembly 9 is arranged upstream of the inverter 8, and measures the current in the inverter output circuit 72.

[0047] A detection set 9 is now described according to a first embodiment, with reference to Figures 2 to 8. A detection set 9' is described later in the description.

[0048] The sensor 10, which is part of the detection assembly 9, is described more specifically. As can be seen in [Fig.3], the sensor 10 includes in particular a detection unit 14 and a support means 16 contributing to the securing of the sensor 10 to the conductive bar 11.

[0049] As can be seen in [Fig. 3], the magnetic detection unit 14 comprises a housing 17 containing a magnetic detection means 15 comprising components 45. A current flowing in the conductive bar 11 is detectable by the magnetic detection means, which may be, for example, a Hall effect probe. The magnetic detection unit 14 also comprises a single Hall effect probe. However, in other embodiments, the magnetic detection unit 14 includes several Hall effect probes.

[0050] The housing 17 comprises four sides 75 and a bottom wall 46 advantageously forming a hollow, a cavity 18 suitable for receiving the magnetic detection means 15.

[0051] As can be seen for example in [Fig.6], the conducting bar 11 defines for example substantially a plate shape having a first bearing face 21, and a second bearing face 22, the bearing surfaces 21, 22 being advantageously parallel and opposite each other.

[0052] Preferably, the magnetic detection means 15 is planar, for example, being a printed circuit board comprising electronic components suitable for current detection by the Hall effect. In this way, the current detection means 15 is substantially planar and has a minimal footprint. Furthermore, the use of a detection means comprising a printed circuit board is advantageous because it offers sufficient mechanical strength to withstand pressure forces.

[0053] Advantageously, the housing 17 is in contact with the conductive bar 11, allowing the detection means 14 to be as close as possible to the conductive bar 11. In this way, it is permitted to detect a magnetic signal detected by the magnetic detection means 14 which is disturbed as little as possible.

[0054] Advantageously, such a housing 17 is made of thermoplastic material, ensuring good thermal and electrical insulation of the detection means 15, without preventing the diffusion of magnetic radiation by the current flowing in the conductive bar 11.

[0055] As shown in the figures, the support means 16 is attached to the housing 17, and allows the detection unit 14 to be held in position against the conductive bar 11. The support means 16 allows in particular the detection unit to be secured against the conductive bar 11.

[0056] As shown in particular in Figures 6 and 7, the support means 16 comprises a first contact surface 19 and a second contact surface 20, the contact surfaces 19 and 20 being advantageously opposed to each other, that is to say, facing each other. Thus, such a support means 16 secures the detection unit against the conductive bar 11, by sandwiching the detection unit 14 and the conductive bar 11. In other words, the contact surfaces 19 and 20 both exert a force aimed at bringing the detection unit 14 closer to, or pressing against, the conductive bar 11, for example on the first bearing surface 21.

[0057] In the embodiments shown, the first contact surface 19 bears on the magnetic detection means 15, itself in direct or indirect contact with the housing 17, while the second contact surface bears on the second bearing face 22 provided on the conductive bar 11. Such a second bearing face 22 being located opposite the first bearing face 21, and the housing 17 being in contact with the first contact surface 21, the clamping action can be achieved.

[0058] In order to allow the action to be maintained, the sensor 10 includes connection means 23, 24. In the embodiment examples, the connection means 23, 24 include a male connection means 23 and a female connection means 24 which cooperate with each other.

[0059] More specifically, the support means 16 includes, for example, a cover 25, the cover 25 comprising the first contact surface 19, and a male connection means 23, incorporating the second contact surface 20. The male connection means 23 is preferably projecting from the cover 25.

[0060] Advantageously, a male connection means 23 incorporates a rod 26, provided with a stop means 27, and a female connection means 24 comprises a hole 28 passing through the bearing faces 21, 22. The hole 28 preferably has a diameter substantially equal to the diameter of the rod 26.

[0061] Preferably, the cover 25 has a proximal zone, for example a plate 29 and two distal zones, for example wings 30, arranged on either side of the plate 29.

[0062] As can be seen in the figures, the plate 29 comprises an external face, intended for example to allow the connection of the wings 30, and an internal face, in contact with the magnetic detection means 15.

[0063] Advantageously, the wings 30 each have openings 31 receiving rods 26, which facilitates the manufacture of the support means 24. In other embodiments not shown, the rods 26 are made from the material of the wings 30, avoiding multiplying the parts.

[0064] Preferably, the support means 16 comprises two male connection means 23, in this case rods 26 each extending through a hole 28. In this way, the detection unit 14 is supported on the first support face 21, the clamping force being distributed symmetrically on either side of the detection unit 14.

[0065] More specifically, each of the rods 26 is advantageously inserted into the hole 28, a stop means 27 coming into contact with the second bearing face 22, the stop means 27 being positioned so as to keep the first face pressed against it support 21 against detection unit 14. Also, the second contact surface 20 is arranged on the stopping means 27.

[0066] As shown in the figures, the stop means 27 is not removable, and consists of an end 32 of a rod 26, the end 32 being provided with a rivet 56. Such an arrangement is easily achievable, and at minimal cost.

[0067] In alternative embodiments not shown, the retaining means 27 is removable, i.e., can be removed from the male connecting means (23) intact, i.e., without being destroyed. In such embodiments, the hole 28 is, for example, tapped, the rod 26 is threaded, and the retaining means 27 is the tapped hole 28. Such an arrangement has the advantage of allowing easy adjustment of the clamping force of the support means 26.

[0068] Advantageously, and as can be seen in particular in [Fig. 8], the support means 16 includes positioning corners 33 projecting from the plate 29, defining substantially a right-angled shape, each forming the first contact surface 19. In this way, the clamping force from the support means 16 is exerted on edges 34 of the magnetic detection means 15. This is advantageous because it avoids exerting force on components constituting the detection means 25.

[0069] In addition, such positioning corners 33 are of four number, forming a base 37, allow the magnetic detection means 15 to be held in position on the support means 16, facilitating the manufacture and assembly of the detection assembly 9.

[0070] As can be seen in Figures 3 and 4, the support means 16 advantageously includes a slot 35 arranged in the plate, allowing a terminal 36 to pass through the cover 25. In this way, the detection assembly 9 can be easily connected to a control unit, for example (not shown in the figures). Such an arrangement facilitates the mounting of the detection assembly 9 within the motor block 7, for example.

[0071] Advantageously, and as can be seen in particular in [Fig. 4], each of the wings 30 comprises, successively from the base 37, a first straight section 38 extending, for example, in a direction perpendicular to the direction of extension of the conductive bar 11, a second curved section 39, and a third straight section 40, extending, for example, in a direction perpendicular to the direction of extension of the conductive bar 11. Furthermore, one wing 30 spans a side 75 of the housing. In this way, the forces exerted on the first contact surface 19 can be absorbed by the conductive bar 19.

[0072] The housing 27 is now described in more detail with reference in particular to [Fig.7].

[0073] In the embodiments shown, the cavity 18 has dimensions substantially complementary to the dimensions of the magnetic detection means 15, limiting the size of the sensor 10 formed.

[0074] Advantageously, the bottom wall 46 is in contact with the conductive bar 11. Such a bottom wall 46 preferably has a shape complementary to the conductive bar 11. In this way, the positioning of the sensor 10 to the conductive bar 11 is easily achieved.

[0075] Advantageously, the housing 17 in particular the bottom wall 46 includes a base face 41, and reliefs, for example a stop 42 projecting from the base face 41, or a curve 47, recessed relative to the base face 41.

[0076] Advantageously, the stop 42 defines, for example, a third, flat contact surface 43. Preferably, the housing comprises a plurality of stops 42, defining coplanar third contact surfaces 43, which facilitates the positioning of the magnetic sensing means 15 within the housing 17. The sensing assembly 9 can thus be easily manufactured and mounted.

[0077] Advantageously, the bottom wall 41 defines two curves 47, preferably spaced apart from each other. The curves 47 are arranged between an overlapping surface 50, the overlapping surface being intended to be positioned on the first bearing surface 21.

[0078] Advantageously, the conductive bar 11 incorporates two peripheral portions 52 defining a rectangular section, and a central portion 53 comprising at least one notch 51 or at least one cutout, in the embodiment shown two notches 51. Such notches 51 make it possible to define a magnetic coupling coefficient so as to use a predetermined sensitivity at the level of the magnetic detection means 15.

[0079] In this way, the housing 17 can be easily put into position due to an easy coupling between the overlapping surface 50 and the central portion 53.

[0080] In order to facilitate the positioning of the magnetic detection means 15 and the support means 16 on the housing 17, the housing 17 includes a centering means, for example a centering rod 44 intended to be inserted into a first centering hole 48 and a second centering hole 49, respectively provided in the support means 16 and the magnetic detection means 15. The manufacture and assembly of the detection assembly 15 are thus facilitated.

[0081] Reference is made to figures 9 to 15 representing a detection set according to a second embodiment.

[0082] Such a second embodiment takes up the principle of positioning a sensor 10 on a conductive bar 11.

[0083] In the second embodiment, the conductive bar 11 is identical to the conductive bar of the first embodiment.

[0084] Similar to the first embodiment, the support means 16 advantageously has a cover 25 provided with two male connection means 23, which are rods 26.

[0085] Unlike the first embodiment, in the second embodiment, and as can be seen in figures 10, 13 and 14, the rods 26 are made from the material of the plate 29 of the cover 25 of the first embodiment, allowing for molding, for example injection molding of the support means 16. Such a support means 16 is thus easy and quick to produce.

[0086] More particularly, in the second embodiment, a wing 30 comprises two first straight sections 57, each being for example parallelepiped in shape, and projecting from the plate 29 of the cover 25. Each straight section 57 is connected by two connecting arms 58 preferably in V, which join at a rod 26. In this way, each wing 30 is connected to the cover 25 at two connection points 59, which allows a good distribution of the holding force of the sensor 30 against the conductive bar 11.

[0087] Advantageously, in the second embodiment, a stopping means 27 advantageously comprises a ferrule 55, formed at one end 32 of a rod 26. Such a ferrule 55 can be manufactured quickly and at a reduced cost.

[0088] In the second embodiment, the magnetic detection means 15 includes a connecting pin 61 which incorporates a raised part 62, a flat part 63 and a lowered part 64, the raised part 62 and the lowered part 64 each being connected to the flat part 63 by a fold 65.

[0089] Advantageously, the flat part 64 is sandwiched between the cover 25 and the housing 17, the raised part 62 extending within a lug 36, allowing the connection of the detection assembly 9 to a control unit for example (not shown in the figures).

[0090] In order to save space and facilitate the mounting of the connecting pin 61 on the support means 16, the inner face 60 comprises a first recess 66 and a second recess 67. In this way, the first recess 66 and the second recess 67 are able to form a guide for the flat part 63 and the raised part 62, respectively. Such recesses can be seen [Fig. 14].

[0091] As illustrated in Figures 13 and 14, the support means 16 of the detection assembly 9 according to the second embodiment comprises at least one centering means. More specifically, a centering means is, for example, a positioning pin 68.

[0092] In the second embodiment, the inner face 60 comprises two protruding positioning pins 68, intended to fit into two second holes 49 made on the magnetic detection means 15. In this way, the support means 16 fits perfectly onto the housing 17. Such an arrangement makes it easier to manufacture and assemble the detection assembly 9.

[0093] As illustrated in Figures 13 and 14, the support means 16 of the detection assembly 9 according to the second embodiment includes notches 70 intended to fit into complementary grooves 71, visible in [Fig.15], facilitating the positioning of the support means 16 on the housing 17.

[0094] A method for manufacturing a detection assembly 9 according to the first embodiment is now described.

[0095] A housing 17, for example previously obtained by molding, is positioned on a central portion 53 via the overlapping surface 50.

[0096] The detection unit is for example constituted by fitting the magnetic detection means 15 into the base 37, then placed in the cavity 18 of the housing 17, the first orifice 48 fitting onto the centering rod 44.

[0097] The cover 25 is positioned on the magnetic detection means 15, the openings 51 being provided with rods 26. The rods 26 having been previously inserted into the openings 51, the head 54 comes to rest against the openings 51.

[0098] With the rods 26 immobilized, the retaining means 27 are formed by riveting the end of the rod 26, applying a predetermined force. In this way, the dimensional chain between the support means 16, the magnetic sensing means 15, the housing 17, and the conductive bar 11 can be easily controlled. The clamping force between the first and second surfaces 19, 20 is thus easily determined. The sensing assembly 9 is therefore mounted without difficulty.

[0099] A method for manufacturing a detection assembly 9 according to the second embodiment is now described.

[0100] As with the first embodiment, a housing 17, for example previously obtained by molding, is positioned on a central portion 53 via the overlapping surface 50.

[0101] The detection unit is for example constituted by fitting the magnetic detection means 15 onto the support means 16, facilitated and guided by the insertion of the positioning pins 68 into the second holes 49, and the introduction of the connecting pin into the recesses 66 and 67.

[0102] The detection unit is positioned within the cavity 18 of the housing 17 by taking advantage of the guidance offered by the sliding of the notches 70 in the grooves 71.

[0103] The rods 26 are inserted into the openings 51 and then immobilized. The locking means 27 are formed by peening the end 32 of the rod 26, i.e., by applying a hot peening tool.

[0104] In this way, the dimension chain between the support means 16, the magnetic sensing means 15, the housing 17, and the conductive bar 11 can be easily controlled. The clamping force between the first and second surfaces 19, 20 is thus easily determined. The sensing assembly 9 is mounted without difficulty.

[0105] Common to embodiments, the sensor has a plane of symmetry, which passes through a plane perpendicular to the direction of extension of the conducting bar and passes through the middle of the sensor 10. In this way, no imbalance is created in the forces.

[0106] It should be noted that the two embodiments are presented one after the other, but features from both embodiments can be combined. For example, it is possible to have a lid similar to that described in the first embodiment, and wings similar to those of the second embodiment.

[0107] The detection assembly 9 has many advantages, in particular:

[0108] - a low manufacturing cost,

[0109] - a manufacturing and assembly that is quick, easy and can be reproduced on a large scale quantities,

[0110] - good measurement quality.

Claims

Demands

1. Current detection assembly (9) comprising a current-conducting bar (11) and a sensor (10) intended to be attached to the current-conducting bar (11), the sensor (10) comprising: a current detection unit (14) comprising a housing (17) intended to receive a magnetic detection means (15), a support means (16) comprising a first contact surface (19) and a second contact surface (20), When the sensor (10) is fixed to the current-conducting bar (11), the magnetic sensing means (15) and the current-conducting bar (11) are arranged respectively between the first contact surface (19) and the second contact surface (20), the support means (16) clamping between the first contact surface (19) and the second contact surface (20), the magnetic sensing means (15) and the current-conducting bar (11), in order to hold the current sensing unit (14) in position against the current-conducting bar (11), the current-conducting bar (11) further comprising a first support face (21) and a second support face (22) opposed to each other, the current-conducting bar (11) being provided with a female connection means (24) passing through the support faces (21, 22), the support means (16) comprising a plate (29), a male connection means (23) projecting from plate (29),When the sensor (10) is attached to the current-conducting bar (11), the detection unit (14) rests on the first support face (21), the male connection means (23) being inserted into the female connection means (24) and comprising a stop means (27) coming into contact with the second support face (22), the stop means (27) being positioned so as to keep the first support face (21) pressed against the detection unit (14).

2. Detection assembly (9) according to the preceding claim, characterized in that the male connection means (23) comprises at least one rod (26), the female connection means (24) comprises at least one hole (28), the stop means (27) being removable.

3. Detection assembly (9) according to claim 1, characterized in that the male connection means (23) comprises at least one rod (26), the female connection means (24) comprises at least one hole (28), the stop means (27) being made of material from the male connection means (23).

4. Detection assembly (9) according to the preceding claim, characterized in that the stopping means (27) is a ferrule (55) formed at the end (32) of the rod (26).

5. Detection assembly (9) according to the preceding claim, characterized in that the male connection means (23) comprises two rods (26), when the sensor (10) is attached to the current-conducting bar (11), the two rods (26) are arranged on either side of the housing (17).

6. A detection assembly (9) according to any one of the preceding claims, characterized in that the housing (17) is provided with a stop (42) within a cavity (18), the stop (42) incorporating a third contact surface (43), the magnetic detection means (16) comprising an orifice (48, 49) for receiving a centering means (44, 68), when the sensor (10) is attached to the current-conducting bar (11), the magnetic detection means (15) being held in position within the cavity (18) by being sandwiched between the first contact surface (19) and the third contact surface (43).

7. A detection assembly (9) according to any one of the preceding claims, characterized in that the magnetic detection means (15) comprises a connecting pin (61), when the sensor (10) is fixed to the current-conducting bar (11), the connecting pin (61) incorporates a raised portion (62), a flat portion (63) and a lowered portion (64), the raised portion (62) and the lowered portion (64) each being connected to the flat portion (63) by a fold (65).

8. Detection assembly (9) according to the preceding claim, characterized in that when the sensor (10) is attached to the current conductive bar (11), the flat part (63) is sandwiched between the cover (25) and the housing (17), the raised part (62) extending within a lug (36).

9. Detection assembly (9) according to the preceding claim, characterized in that the support means (16) comprises a first impression (66) and a second impression (67) made within an internal face (60) of the cover (25), the first impression (66) and the second impression (67) being able to form a guide for respectively the flat part (63) and the raised part (62).

10. Detection assembly (9) according to any one of the preceding claims, characterized in that the current-conducting bar (11) comprises two peripheral portions (52) defining a rectangular section, and a central portion (53) comprising at least one notch (51).

11. Electric motorization unit (7) comprising a current sensing assembly (9) according to any one of claims 1 to 10, and an inverter (8), the current sensing assembly (9) being disposed upstream of the inverter (8).

12. Electric motorization unit according to the preceding claim, characterized in that the inverter (8) is powered by an electrical source (E), the inverter (8) being connected to the electrical source (E) via an inverter power supply circuit (73) equipped with a detection assembly (9) according to any one of claims 1 to 10.

13. Electric motor unit (7) according to the preceding claim, characterized in that the electric motor unit (12) comprises an electric motor (7) having three or six poles (13), each of them being supplied by a power supply circuit of the electric motor (74) in which a current flows, each of the currents flowing in a power supply circuit having a different phase, at least two power supply circuits of the motor (74) being provided with a detection assembly (9) according to any one of claims 1 to 10.

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