[0043] Unless otherwise stated, the same elements shown in different drawings have a single reference label.
[0044] The invention relates to a rotating electric machine 1 especially for motor vehicles. The rotating electric machine 1 according to the present invention may be in the form of an alternator, an electric motor, or a reversible electric machine capable of operating in two modes.
[0045] figure 1 The overall structure of the rotating electric machine 1 is schematically shown.
[0046] Reference figure 1 , The rotating electric machine 1 includes a stator 2 and a rotor 7 mounted on a shaft 8. The shaft 8 is assembled to rotate around the rotation axis X through bearing devices 81 and 82 (for example, ball bearings). The bearing devices 81 and 82 are supported by the rear support 31 and the front support 32 that form the housing 3 of the rotary electric machine 1.
[0047] The stator 2 includes a main body 21 that is supported by the casing 3, and the main body 21 is in the form of a stack of thin metal plates, for example, assembled in the casing 3 of the motor 1 by shrinking. The main body 21 of the stator 2 forms a crown, and its inner surface 25 is provided with a notch 26 that opens toward the inside. The notch 26 accommodates the winding 22, such as figure 2 Shown. The portion of the winding 22 that extends axially with respect to the end 211 of the main body 21 of the stator 2 is referred to as the "winding 22 bun 23". It should be noted that the rear support 31 and the front support 32 are positioned facing the winding 22 bun portion 23. In addition, the bun portion 23 is formed by pins 24, each of which includes a head having a “U” shape and two branches received in two different recesses 26.
[0048] Figure 4a to 6 The rotating electric machine 1 according to the first embodiment is shown.
[0049] In order to measure in motor 1, especially when motor 1 is operating, change Figure 5c The sensor 4 shown is positioned inside the motor 1. The sensor 4 is accommodated in the gap 8 defined by the rear support 31 of the housing of the motor 1 and the winding 22 bun 23.
[0050] According to an embodiment, the sensor 4 is a temperature sensor. Advantageously, the temperature sensor is connected to a thermal protection circuit configured to cut off the power supply of the motor 1 when overheating is detected.
[0051] In addition, according to a non-limiting embodiment, the sensor 4 is fixed on an elastically deformable support. Therefore, the sensor 4 can be inserted at the gap 8 through deformation, and can be supported on the bun 23 of the winding 22. In addition, this type of support allows the shape of the pin 24 to correspond to the bun 23 of the winding 22. The elastically deformable support is composed of, for example, a thermally conductive resin that ensures heat exchange between the bun 23 and the sensor 4.
[0052] In order to improve the contact between the sensor 4 and the winding 22 bun 23, the rotating electric machine 1 according to the present invention includes a wedging element 5 that can cooperate with the rear support 31 of the electric machine 1. The wedging element 5 ensures that the sensor 4 is compressed against the bun 23 of the winding 22 in a continuous and optimal manner. According to another embodiment not shown, the wedging element 5 may cooperate with the front support 32 to ensure that the sensor 4 is compressed against the bun 23 of the winding 22.
[0053] according to Figure 4a with 4b In the illustrated embodiment, the lower portion 51 of the wedging element 5 is chamfered into a first inclined plane P1. In other words, when the wedging element 5 is located on the rear support 31, the lower surface 57 of the wedging element 5 is inclined relative to the horizontal. “Horizontal” refers to a plane perpendicular to the rotation axis X of the motor 1. The first slope P1 is calculated based on a predetermined pressure that ensures optimal compression of the sensor 4 against the bun portion 22 of the winding 23. In addition, the rear support 31 includes an upper portion 311 forming a second slope P2. in Figure 4a with 4b In the illustrated embodiment, a cavity 32 is provided in the upper part 311 of the rear support 31, and the base 321 of the cavity 32 forms a second inclined plane P2. This type of cavity 32 allows the guidance of the wedging element 5 when the wedging element 5 is moved on the rear support 31. According to another embodiment not shown, the rear support 31 does not include the cavity 32, and the upper surface 313 of the rear support 31 has an inclination relative to the horizontal, so as to form a second inclined plane P2. In the same way as the first slope P1, the second slope P2 is calculated based on a predetermined pressure that ensures the optimal compression of the sensor 4 against the bun portion 22 of the winding 23. The cooperation of the first inclined plane P1 and the second inclined plane P2 ensures that displacement is generated by sliding the wedge element 5 along the inclined plane toward the bun portion 23 of the winding 22 to compress the sensor 4 between the wedge element 5 and the bun portion 23 .
[0054] In order to control the pressure exerted by the wedging element 5 on the sensor 4, according to an embodiment, the wedging element 5 includes a first stop B1 designed to cooperate with a second stop B2 provided in the rear support 31 . The first stopper B1 is constructed and designed to be in contact with the second stopper B2 provided in the rear support 31. The contact between the first stop B1 and the second stop B2 defines the maximum compression of the sensor 4 against the bun 23 of the winding 22. In other words, when the first stop B1 is in contact with the second stop B2, the wedging element 5 is in the final position.
[0055] according to Figure 4a to 6 In the illustrated embodiment, the first stop B1 is formed by a shoulder provided in the lower portion 51 of the wedging element 5. In other words, a part of the lower surface 57 of the wedging member 5 is inclined to form a first inclined surface P1, and another part of the lower surface 57 extends in a horizontal direction to form a first stopper B1. In addition, the second stopper B2 is formed by a shoulder provided in the upper portion 311 of the rear support 31. In other words, a part of the upper surface 313 of the wedging element 5 is inclined to form a second inclined surface P2, and another part of the upper surface 313 extends in a horizontal direction to form a second stopper B2. When the wedging element 5 is located on the rear support 31, the distance d separating the first stop B1 from the second stop B2 defines the compression of the sensor 5. The greater the distance d increases, the greater the compression of the sensor 4 against the winding bun 23 increases until the first stop B1 contacts the second stop B2, which corresponds to the sensor 4 abuts the winding 22 bun Maximum compression of section 23. Therefore, the distance d makes it possible to calculate the exact path of the wedging element 5.
[0056] In addition, according to a non-limiting embodiment, the fixing element 6 makes it possible to fix the wedging element 5 on the rear support 31. The fixing element 6 is designed to cooperate with the first hole 52 provided in the wedging element 5 and the second hole 312 provided in the rear support 31. The fixing element 6 is in the form of a fixing screw, for example, and includes a handle 61 and a head 62.
[0057] The first hole 52 is Figure 5b with 5c The through hole shown in and is designed to accommodate a part of the handle 61. More specifically, the first hole 52 extends between the upper surface 58 and the lower surface 57 of the wedging element 5. From Figure 5c It can be seen that the first hole 52 is an oblong hole with a width L greater than the diameter D of the shank 61 in order to allow the wedging element 5 to be displaced relative to the rear support 31 without the first hole 52 adjoining the fixing element 6. During the contact between the first stop B1 and the second stop B2, an assembly gap is maintained between the first hole 52 and the fixing element 6.
[0058] Such as Figure 5c As shown, the second hole 312 is designed to receive a part of the handle 61. The second hole 312 penetrates the upper surface 313 of the rear support 31, and may also penetrate the lower surface 314 of the rear support 31, such as Figure 5c with 6 Shown.
[0059] In addition, such as Image 6 As shown, when the wedging element 5 is fixed on the rear support 31, the head 62 of the fixing element 6 is designed to abut the upper surface 58 of the wedging element 5. In addition, according to a non-limiting embodiment, the metal insert 53 is located in the first hole 52. In this case, when the wedging element 5 is fixed on the rear support 31, the head 62 of the fixing element 6 abuts the upper end of the metal insert 53. The placement of the metal insert 53 makes it possible to limit the marking of the wedging element 5 by the fixing element 6, thereby prolonging the service life of the wedging element 5. The metal element 53 also makes it possible that there is no creep effect on the wedge element 5 during thermal shock.
[0060] Figure 7 The rotating electric machine 1 according to the second embodiment of the present invention is partially shown.
[0061] The rotary electric machine 1 according to the second embodiment has generally the same characteristics as the rotary electric machine 1 according to the first embodiment of the present invention. In addition, unlike the motor 1 according to the first embodiment, a recess 54 is provided in the lower portion 51 of the wedging element 5, and the elastic element 55 is located in the recess 54. The elastic element 55 is constructed and designed to exert a force on the wedging element 5 so as to keep the sensor 4 compressed against the winding 22 bun 23 despite the aging of the component over a period of time. according to Figure 7 In the illustrated embodiment, the elastic element 55 is a leaf spring which is compressed and inserted in the recess 54 between the upper surface 541 of the recess 54 and the upper surface 313 of the rear support 31 (or the base 321 of the cavity 32). in Figure 7 In the embodiment, the first end 551 and the second end 552 of the leaf spring are in contact with the inner surface 542 of the recess 54 so as to apply a force directed toward the sensor 4 on the wedging element 5.
[0062] Figure 8 The steps of the method 100 of assembling the wedging element 5 on the rear support 31 according to the embodiment of the present invention are shown.
[0063] In the preliminary step 101, the elastic element 55 is located in the recess 54 of the wedging element 5. It should be noted that in the first embodiment, the preliminary step 101 is not performed.
[0064] In the first step 102, the wedging element 5 is positioned on the upper part 311 of the support 31 so that the first slope P1 is in contact with the second slope P2. Then, the wedging element 5 slides on the upper part 311 of the support 31 until the inner surface 56 of the wedging element 5 contacts the sensor 4. The compression of the sensor 4 between the wedging element 5 and the winding 22 bun 23 is very small.
[0065] In the second step 103, the wedging element 5 is moved towards the sensor 4 (along Figure 5c The direction of the arrow shown in ), so that the compression of the sensor 4 between the wedging element 5 and the bun 23 is increased. This makes it possible to apply a force directed towards the sensor 4 and then to further press the force against the bun 23. When the sensor 4 is fixed on the elastically deformable support, the displacement of the wedging element 5 toward the sensor 4 increases the deformation of the sensor, thereby increasing the contact surface between the sensor 4 and the bun 23. It should also be noted that the more the wedging element 5 moves towards the sensor 4, the more the distance d decreases. When the compression of the sensor 4 reaches the maximum value, the first stopper B1 contacts the second stopper B2, and the distance d is zero. In this way, it is no longer possible to further compress the sensor 4 against the bun 23.
[0066] In the third step 104, the shank 61 of the fixing element 6 is successively positioned in the first hole 52 and then in the second hole 312 until the head 62 abuts the upper face 58 of the wedging element 5. Then a nut (not shown) can be screwed on the free end 611 of the handle 61 until it abuts the lower surface 314 of the rear support 31. The position of the wedging element 5 relative to the rear support 31 and thus the compression 4 of the sensor is fixed.
