Supercharger

Abstract

The present invention is provided with a motor having a rotor provided on a rotating shaft and a stator provided around the rotor, the stator having a stator core, an insulator, a coil, a bus bar connected to an end of the coil, and a thermistor, and a temperature sensing element portion of the thermistor being inserted in an axial direction with respect to a pocket provided in the insulator. A signal cable of the thermistor is led out from the temperature-sensing element portion in a direction opposite to a direction in which the signal cable is inserted into the pocket, and extends so as to traverse the temperature-sensing element portion side of the bus bar when viewed from the axial direction.

Description

Technical Field

[0001] The present invention relates to a supercharger. Background Art

[0002] Conventionally, in a supercharger equipped with a motor, when the torque of the turbine to the rotating shaft is insufficient, the motor applies torque to the rotating shaft to compensate for the deficiency. In such a motor built into the supercharger, temperature management is required to prevent malfunction of the coil caused by heat. A thermistor mounted on the stator for such temperature management is known (for example, refer to the following patent document 1).

[0003] Patent Document 1: Japanese Patent No. 5333657

[0004] In the motor of Patent Document 1, a thermistor is mounted on the coil end of the stator using a predetermined mounting tool. However, in addition to the mounting space for the thermistor, a mounting space for the mounting tool itself is required, so the space inside the stator is compressed, which hinders the miniaturization of the stator. In addition, it is also considered to use an adhesive to bond the thermistor to the stator, but due to uneven bonding strength, it is difficult to stably fix the thermistor. Summary of the invention

[0005] The present disclosure provides a supercharger that reduces the installation space required by mounting a thermistor on a stator of a motor and stably fixes the thermistor.

[0006] The gist of the present disclosure is as follows.

[0007] [1] A supercharger, comprising an auxiliary motor unit, comprising: a rotor disposed on a rotating shaft connecting turbine blades and compressor blades, and a stator disposed around the rotor, the stator comprising: a stator core; an insulator disposed around the stator core; a coil wound around the insulator; a bus bar connected to one of the two ends of the coil, the coil end located on the inner circumference; and a temperature measuring unit, comprising: a temperature sensing element unit for detecting the temperature of the coil, and a signal cable led out from the temperature sensing element unit, the temperature sensing element unit being inserted into an element pocket provided in the insulator along the rotation axis direction of the auxiliary motor unit, the signal cable being led out from the temperature sensing element unit in a direction opposite to the direction in which the temperature sensing element unit is inserted into the element pocket, and extending in a manner that traverses the temperature sensing element unit side of the bus bar when viewed from the rotation axis direction.

[0008] According to the supercharger of the present disclosure, it is possible to stably fix the thermistor while suppressing the installation space required by mounting the thermistor on the stator of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional view of the supercharger according to the embodiment.

[0010] Figure 2 (a) to (c) are views showing exploded views of the main component groups of the stator.

[0011] Figure 3 (a) to (c) are followed by Figure 2 A diagram showing the main components of the stator in an exploded view.

[0012] Figure 4 This is the circuit diagram of the stator.

[0013] Figure 5 (a) is a perspective view showing an electromagnet assembly provided with a thermistor, and (b) is a perspective view showing a state where a coil is removed from the electromagnet assembly.

[0014] Figure 6 yes Figure 5 (b) VI-VI cross-sectional view.

[0015] Figure 7 This is a diagram showing an enlarged view of the vicinity of a thermistor in the stator before fixation by resin molding, viewed in the axial direction from the compressor side. DETAILED DESCRIPTION

[0016] The gist of the present disclosure is as shown in the following [1] to [6].

[0017] [1] A supercharger, comprising an auxiliary motor unit, comprising: a rotor disposed on a rotating shaft connecting turbine blades and compressor blades, and a stator disposed around the rotor, the stator comprising: a stator core; an insulator disposed around the stator core; a coil wound around the insulator; a bus bar connected to one of the two ends of the coil, the coil end located on the inner circumference; and a temperature measuring unit, comprising: a temperature sensing element unit for detecting the temperature of the coil, and a signal cable led out from the temperature sensing element unit, the temperature sensing element unit being inserted into an element pocket provided in the insulator along the rotation axis direction of the auxiliary motor unit, the signal cable being led out from the temperature sensing element unit in a direction opposite to the direction in which the temperature sensing element unit is inserted into the element pocket, and extending in a manner that traverses the temperature sensing element unit side of the bus bar when viewed from the rotation axis direction.

[0018] [2] A supercharger according to [1], wherein the bus bar extends radially inward from an insulating member located on the outer peripheral side of the coil end and is connected to the coil end, and a portion of the signal cable between a portion that crosses the bus bar and an end of the cable led out to the outside of the stator is embedded in a groove formed in the insulating member.

[0019] [3] A supercharger according to [1] or [2], wherein a plurality of electromagnet assemblies having the stator core, the insulator and the coil are arranged in a circumferential direction, and when viewed from the axial direction, the bus bar extends radially between two adjacent electromagnet assemblies, and both of the two signal cables led out from the temperature sensing element portion are led out from the temperature sensing element portion in a direction opposite to the direction in which the temperature sensing element portion is inserted into the element pocket, and extend in a manner transverse to the bus bar when viewed from the direction of the rotation axis and pass through the temperature sensing element portion side of the bus bar.

[0020] [4] The supercharger according to any one of [1] to [3], wherein the coil end portion extends in the axial direction and is disposed adjacent to the temperature sensing element portion in the element pocket in the circumferential direction.

[0021] [5] The supercharger according to any one of [1] to [4], wherein a mold resin is filled between the temperature sensing element portion and the coil.

[0022] [6] The supercharger according to any one of [1] to [5], wherein a gap is formed in the element pocket so that a portion of the temperature sensing element portion in the element pocket is exposed, and the coil and the temperature sensing element portion are close to each other through the gap.

[0023] A supercharger 1 according to an embodiment of the present disclosure will be described with reference to the drawings. Figure 1 This is a cross-sectional view obtained by selecting a cross section including the rotation axis H of the supercharger 1. In the following description, when simply referred to as "axial direction", "radial direction" and "circumferential direction", they refer to the axial direction, radial direction and circumferential direction of the rotating shaft 14 described later. In addition, when simply referred to as "outer circumference side / inner circumference side", it refers to the radial outer side / inner side of the rotating shaft 14.

[0024] The supercharger 1 is applied to an internal combustion engine of a vehicle or the like. Figure 1 As shown, the supercharger 1 includes a turbine 2 and a compressor 3. The turbine 2 includes a turbine housing 4 and a turbine impeller 6 accommodated in the turbine housing 4. The turbine housing 4 has a vortex flow path 16 extending in the circumferential direction around the turbine impeller 6. The compressor 3 includes a compressor housing 5 and a compressor impeller 7 accommodated in the compressor housing 5. The compressor housing 5 has a vortex flow path 17 extending in the circumferential direction around the compressor impeller 7.

[0025] The turbine impeller 6 is provided at one end of the rotating shaft 14, and the compressor impeller 7 is provided at the other end of the rotating shaft 14. A bearing housing 13 is provided between the turbine housing 4 and the compressor housing 5. The rotating shaft 14 is rotatably supported by the bearing housing 13 via a bearing 15, and the rotating shaft 14, the turbine impeller 6, and the compressor impeller 7 rotate around the rotating axis H as an integrated rotating body 12.

[0026] The turbine housing 4 is provided with an exhaust gas inlet (not shown) and an exhaust gas outlet 10. Exhaust gas discharged from an internal combustion engine (not shown) flows into the turbine housing 4 through the exhaust gas inlet. Thereafter, the exhaust gas flows into the turbine impeller 6 through the swirl flow path 16, causing the turbine impeller 6 to rotate. Thereafter, the exhaust gas flows out of the turbine housing 4 through the exhaust gas outlet 10.

[0027] The compressor housing 5 is provided with an inlet 9 and an outlet (not shown). When the turbine impeller 6 rotates as described above, the compressor impeller 7 rotates via the rotating shaft 14. The rotating compressor impeller 7 inhales external air through the inlet 9. The air is compressed by passing through the compressor impeller 7 and the vortex flow path 17, and is discharged from the outlet. The compressed air discharged from the outlet is supplied to the above-mentioned internal combustion engine.

[0028] In addition, the supercharger 1 includes a motor 21 (auxiliary motor unit). For example, when the torque of the rotating shaft 14 is insufficient during acceleration of the vehicle, the motor 21 applies torque to the rotating shaft 14 to compensate for the deficiency. The motor 21 is, for example, a brushless AC motor, and includes a rotor 25 as a rotating part and a stator 27 as a fixed part. The battery of the vehicle can be used as a driving source for the motor 21. In addition, when the vehicle decelerates, the motor 21 can also use the rotational energy of the rotating body 12 to regenerate electricity. The motor 21 has the characteristic of being able to cope with high-speed rotation of the rotating shaft 14 (for example, 100,000 to 200,000 rpm).

[0029] The rotor 25 is arranged between the bearing 15 and the compressor impeller 7 in the axial direction. The rotor 25 is fixed to the rotating shaft 14 and can rotate together with the rotating shaft 14. The stator 27 is accommodated in the bearing housing 13 and is arranged to surround the rotor 25 in the circumferential direction. The stator 27 includes a plurality of coils and an iron core (not shown). When current is supplied to the coils to generate a magnetic field in the stator 27, a circumferential force acts on the permanent magnet 29 of the rotor 25 by means of the magnetic field, and as a result, a torque is applied to the rotating shaft 14.

[0030] The stator 27 will be described in more detail. Figure 2 (a)~ Figure 2 (c) and Figure 3 (a)~ Figure 3(c) is a diagram showing the main components of the stator 27 in an exploded manner. Figure 2 and Figure 3 The direction perpendicular to the paper is the axial direction, the inner side of the paper is the turbine 2 side, and the front side of the paper is the compressor 3 side. Figure 2 The component group shown in (c) is arranged overlappingly on the front side of the paper. Figure 2 The component group shown in (b) is further overlapped and arranged near the front side of the paper. Figure 2 The component group shown in (a) is shown in FIG. Figure 2 The component group shown in (c) is arranged in an overlapping manner on the back side of the paper Figure 3 The component group shown in (a) is overlapped and arranged on the back side of the paper. Figure 3 The component group shown in (b) is further overlapped and arranged on the back side of the paper. Figure 3 The component group shown in (c).

[0031] Figure 2 (c) shows the main body 30 of the stator 27. The main body 30 has a structure for surrounding the rotor 25 ( Figure 1 ) are arranged in a manner of 6 electromagnet assemblies 31. The above-mentioned electromagnet assemblies 31 are, for example, housed in a circular metal shell (not shown), and are arranged at equal intervals along the circumferential direction at intervals of 60°. The electromagnet assembly 31 comprises: an iron core tooth portion 33 extending radially inward, and a coil 35 wound on the iron core tooth portion 33. The coil 35 is composed of a group of two round wires, and the winding method of the coil 35 is concentrated winding, and the number of windings of the coil 35 is 5.5 turns. The coil end 36 located on the radial inner side of the coil end of the coil 35 extends from the iron core tooth portion 33 to the compressor side ( Figure 2 The coil end 37 located on the radially outer side is led out from the core tooth portion 33 to the turbine side ( Figure 2 on the inside of the paper) is drawn out.

[0032] The stator 27 is a 3-phase 6-slot stator, and the 6 coils 35 are composed of a first U-phase coil 35u1, a second U-phase coil 35u2, a first V-phase coil 35v1, a second V-phase coil 35v2, a first W-phase coil 35w1, and a second W-phase coil 35w2. Figure 2 The first V-phase coil 35v1, the second W-phase coil 35w2, the first U-phase coil 35u1, the second V-phase coil 35v2, the first W-phase coil 35w1 and the second U-phase coil 35u2 are arranged in this order clockwise. As the rotor 25 facing the stator 27, a motor rotor with one pole pair of SPM is used.

[0033] The compressor side of the main body 30 is provided Figure 2(b) shows the neutral point bus bar 39. The neutral point bus bar 39 includes: an annular portion 41 provided on the peripheral portion of the main body 30, and three connecting bus bars 43u2, 43v2, and 43w2 extending in a cantilever manner from the annular portion 41 toward the inner circumference. The connecting bus bar 43u2 is connected to the coil end 36 of the second U-phase coil 35u2, the connecting bus bar 43v2 is connected to the coil end 36 of the second V-phase coil 35v2, and the connecting bus bar 43w2 is connected to the coil end 36 of the second W-phase coil 35w2. The connecting bus bars 43u2, 43v2, and 43w2 are arranged at equal intervals in the circumferential direction at intervals of 120°. When viewed from the axial direction, the connecting bus bar 43u2 extends radially at a position between the second U-phase coil 35u2 and the first W-phase coil 35w1. The connection bus bar 43v2 extends radially between the second V-phase coil 35v2 and the first U-phase coil 35u1 when viewed from the axial direction. The connection bus bar 43w2 extends radially between the second W-phase coil 35w2 and the first V-phase coil 35v1 when viewed from the axial direction.

[0034] In addition, on the compressor side of the neutral point bus bar 39, a Figure 2 (a) shows three lead bus bars 45u1, 45v1, and 45w1. One end of the lead bus bar 45u1 is connected to the coil end 36 of the first U-phase coil 35u1, one end of the lead bus bar 45v1 is connected to the coil end 36 of the first V-phase coil 35v1, and one end of the lead bus bar 45w1 is connected to the coil end 36 of the first W-phase coil 35w1. The other ends of the three lead bus bars 45u1, 45v1, and 45w1 constitute input terminals 47u, 47v, and 47w for receiving input of current from the outside, and each protrudes to the outer peripheral side of the main body 30 and is exposed to the outside of the stator 27.

[0035] The lead-out bus bar 45u1 connects the input terminal 47u to the coil end 36 of the first U-phase coil 35u1 via an arc portion along the peripheral portion of the main body 30. When viewed from the axial direction, the portion of the coil end 36 side of the lead-out bus bar 45u1 extends radially at a position between the first U-phase coil 35u1 and the second W-phase coil 35w2. The lead-out bus bar 45v1 connects the input terminal 47v to the coil end 36 of the first V-phase coil 35v1 in a substantially straight line. When viewed from the axial direction, the portion of the coil end 36 side of the lead-out bus bar 45v1 extends radially at a position between the first V-phase coil 35v1 and the second U-phase coil 35u2. The lead-out bus bar 45w1 connects the input terminal 47w to the coil end 36 of the first W-phase coil 35w1 via an arc portion along the peripheral portion of the main body 30. When viewed in the axial direction, a portion of the lead bus bar 45w1 on the coil end 36 side extends in the radial direction at a position between the first W-phase coil 35w1 and the second V-phase coil 35v2.

[0036] like Figure 3 (a)~ Figure 3 As shown in (c), three overlapping bus bars 49u, 49v, and 49w are overlapped on the turbine side of the main body 30. The overlapping bus bar 49u connects the coil end 37 of the first U-phase coil 35u1 with the coil end 37 of the second U-phase coil 35u2 via a semicircular arc portion along the peripheral edge of the main body 30. The overlapping bus bar 49v connects the coil end 37 of the first V-phase coil 35v1 with the coil end 37 of the second V-phase coil 35v2 via a semicircular arc portion along the peripheral edge of the main body 30. The overlapping bus bar 49w connects the coil end 37 of the first W-phase coil 35w1 with the coil end 37 of the second W-phase coil 35w2 via a semicircular arc portion along the peripheral edge of the main body 30.

[0037] In addition, the neutral point bus bar 39, lead line bus bars 45u1, 45v1, 45w1, and jumper bus bars 49u, 49v, 49w as described above are respectively formed of copper plate parts formed integrally, and extend in planes substantially perpendicular to the axial direction. When such bus bars are arranged overlappingly along the axial direction on the main body 30, an electrical insulating layer is sandwiched between each bus bar and the electromagnet assembly 31, and between each bus bar. For example, in the present embodiment, the neutral point bus bar 39, the lead line bus bars 45u1, 45v1, 45w1, and the annular insulating resin portion 42 (see Figure 7 ) are integrally formed. A portion of the insulating resin portion 42 enters between the bus bars, etc., and functions as the above-mentioned electrical insulating layer. Figure 2 and Figure 3 The component group shown is composed of Figure 4The circuit diagram shows a Y-junction line 2 connected in series with the stator 27.

[0038] In the stator 27 during operation, if the coil 35 reaches a high temperature, the insulation film may be damaged and a short circuit may occur, so it is necessary to manage the temperature of the coil 35. For this temperature management, the stator 27 is equipped with a thermistor 51. The thermistor 51 is mounted on the core tooth portion 33 of one electromagnet assembly 31. The thermistor 51 (see Figure 5 (b)) comprises: a temperature sensing element portion 51a, which is in the shape of an elongated rectangular parallelepiped; two signal cables 51b, which extend from one end face of the temperature sensing element portion 51a in the longitudinal direction; and a crimping terminal 51c, which is arranged at the end of each signal cable 51b for achieving connection with the outside.

[0039] As described above Figure 2 and Figure 3 In the state where the components are assembled as one, the whole is molded and fixed by resin, and the input terminals 47u, 47v, 47w and the two crimping terminals 51c are exposed to the outside from the mold resin 50. As a processing method for the above-mentioned resin molding, for example, transfer molding, casting, etc. are used.

[0040] Next, a structure in which the thermistor 51 is provided in the stator 27 will be described.

[0041] Figure 5 (a) is a perspective view showing one of the six electromagnet assemblies 31 in which the thermistor 51 is provided. Figure 5 (b) is a perspective view showing a state where the coil 35 is removed from the electromagnet assembly 31 . Figure 6 yes Figure 5 VI-VI cross-sectional view in (b).

[0042] like Figure 5 (b) and Figure 6 As shown in FIG. 1 , the electromagnet assembly 31 includes a stator core 53 as an iron core and a resin insulator 55 provided to cover the surface of the stator core 53. The stator core 53 and the insulator 55 are integrally formed by, for example, insert molding. The insulator 55 functions as a guide for winding the coil 35 and as an electrical insulating portion between the stator core 53 and the coil 35. The periphery of the stator core 53 in the core tooth portion 33 is completely covered by the insulator 55, and the coil 35 is wound around the insulator 55.

[0043] A pocket 57 for installing the thermistor 51 is provided in the insulator 55 at the front end portion (end portion on the inner circumference side) of the core tooth portion 33. The pocket 57 is formed by cutting off a portion of the end portion on the inner circumference side of the insulator 55. The temperature sensing element portion 51a is inserted into the pocket 57 in the axial direction from the compressor side toward the turbine side. The temperature sensing element portion 51a abuts against the pocket bottom surface 57a on the turbine side and is accommodated in a posture with the longitudinal direction facing the axial direction.

[0044] Before the above-mentioned resin molding process is performed, the displacement of the temperature sensing element 51a to the turbine side is restricted by the pocket bottom surface 57a. On the other hand, there is no portion in the pocket 57 that restricts the movement of the temperature sensing element 51a to the compressor side, and the temperature sensing element 51a can be pulled out from the pocket 57 to the compressor side. In addition, the pocket 57 contains: wall-like portions 57b and 57c that restrict the radial displacement of the temperature sensing element 51a, a wall surface 57d that restricts the circumferential displacement of the temperature sensing element 51a, and a restriction portion 57e. Therefore, before the resin molding process is performed, the displacement of the temperature sensing element 51a in the radial and circumferential directions is restricted. A gap 57f is provided in the radial direction between the restriction portion 57e and the wall-like portion 57b, and within the width of the gap 57f, the temperature sensing element 51a is exposed in the circumferential direction as a whole throughout the length direction.

[0045] like Figure 5 As shown in (a), the coil end 35a on the side of the coil end 36 in the coil 35 passes through the turbine side of the pocket bottom surface 57a, bends toward the compressor side, and extends axially along the above-mentioned gap 57f. The coil end 35a is adjacent to the temperature sensing element part 51a in the circumferential direction through the gap 57f. That is, the coil end 35a is close to the temperature sensing element part 51a through the gap 57f. In addition, the coil end 35a can also contact the temperature sensing element part 51a. In addition, the limiting part 57e can also function as a guide for the coil end 35a.

[0046] The above is an example of the electromagnet assembly 31 ( Figure 5 and Figure 6 ) is described in detail. In contrast, the other electromagnet assemblies 31 not provided with thermistors 51 differ only in that the pockets 57 are not formed, and have the same structure in other aspects, so repeated descriptions are omitted. Among them, pockets 57 may be formed in all of the six electromagnet assemblies 31, including the other electromagnet assemblies 31 not provided with thermistors 51. In this case, it is preferred that the components can be made common among all the electromagnet assemblies 31.

[0047] Figure 7This is a diagram obtained by enlarging the vicinity of the thermistor 51 in the stator 27 before the resin molding process and observing it from the compressor side in the axial direction. Here, it is assumed that the thermistor 51 is set in the electromagnet assembly 31 that constitutes the first V-phase coil 35v1. As shown in the figure, the temperature sensing element portion 51a of the thermistor 51 is accommodated in the pocket 57 of the insulator 55 of the electromagnet assembly 31. When viewed from the axial direction, the temperature sensing element portion 51a exists in a position slightly offset from the lead wire bus bar 45v1 in the circumferential direction. For example, Figure 7 In FIG. 4 , the temperature sensing element 51a is located slightly offset to the right of the lead bus bar 45v1. The end surface of the temperature sensing element 51a on the compressor side is located closer to the turbine side than the lead bus bar 45v1.

[0048] The two signal cables 51b of the thermistor 51 are led out from the end face of the temperature sensing element portion 51a on the compressor side, and extend across the position of the lead bus bar 45v1 when viewed from the axial direction. In the portion where the signal cables 51b cross the lead bus bar 45v1, the two signal cables 51b pass through the turbine side of the lead bus bar 45v1. The front ends of the two signal cables 51b are respectively embedded in two grooves 42a provided in the insulating resin portion 42. The grooves 42a are formed on the end face of the insulating resin portion 42 on the compressor side, and are located closer to the lead bus bar 45v1 than to the lead bus bar 45v1. Figure 7 The signal cable 51b is placed on the left side of the insulating resin portion 42. In addition, the groove 42a has a claw 42b for holding the signal cable 51b in the groove 42a. By fitting the groove 42a having such a claw 42b, the signal cable 51b does not easily float from the insulating resin portion 42 to the compressor side.

[0049] The front ends of the two signal cables 51b are led out to the outer peripheral surface of the insulating resin part 42 through the insertion hole provided at the end of the outer peripheral side of the groove 42a. Then, the signal cables 51b extend to the opposite sides on the outer peripheral surface of the insulating resin part 42. A cable holding part 42d for holding the signal cables 51b is provided on the outer peripheral surface of the insulating resin part 42. A groove with a claw is provided on the cable holding part 42d similarly to the groove 42a, and the signal cables 51b are inserted and held in the groove.

[0050] In addition, the cable holding portion 42d guides the bending of the front end portion of the signal cable 51b. The front end portion of the signal cable 51b is held and guided by the cable holding portion 42d, and is bent outward from the outer peripheral surface, and a crimping terminal 51c is provided at the front end portion. The vicinity of the bending portion of the signal cable 51b held by the cable holding portion 42d is preliminarily covered with a heat shrink tube. By covering with the heat shrink tube, the rigidity of the signal cable 51b is improved near the bending portion, and the bending shape of the bending portion is maintained by the rigidity of the signal cable 51b. Thus, the position of the crimping terminal 51c is maintained at a position slightly on the outer peripheral side of the cable holding portion 42d by the rigidity of the signal cable 51b. This position is adjusted according to the position of the external plug to which the crimping terminal 51c is bolted, thereby improving the operability when the crimping terminal 51c is bolted to the external plug.

[0051] As described above, the temperature sensing element 51a is stored and pre-fixed in the pocket 57, and the signal cable 51b is routed, and then the resin molding process described above is performed. Through the resin molding process, the temperature sensing element 51a and the signal cable 51b of the thermistor 51 are embedded in the molding resin 50 ( Figure 2 ) and formally fixed.

[0052] In addition, the signal cable 51b is not necessarily configured to be fixed to the insulating resin portion 42 by the cable holding portion 42d as described above. That is, the signal cable 51b does not necessarily need to be fixed in the housing of the supercharger 1. The insulating resin portion 42 may also be omitted. In addition, the thermistor 51 may also have a connector (not shown) of a predetermined structure instead of the crimping terminal 51c, and be connected to the outside via the connector.

[0053] The effects of the supercharger 1 including the stator 27 described above will be described.

[0054] If the pre-fixing of the thermistor 51 is weak before the resin molding process is performed, the position of the thermistor 51 may be shifted due to external forces generated during assembly and resin molding. In contrast, according to the structure of the stator 27, the presence of the pocket 57 that accommodates the temperature sensing element portion 51a of the thermistor 51 ensures that the temperature sensing element portion 51a is pre-fixed to the front end portion of the core tooth portion 33 before the resin molding process is performed.

[0055] In this pre-fixed state, the temperature sensing element portion 51a can be displaced axially toward the compressor side relative to the pocket 57. In contrast, the signal cable 51b led out from the temperature sensing element portion 51a to the compressor side crosses the lead bus bar 45v1 when viewed from the axial direction, and the portion that crosses the lead bus bar 45v1 passes through a position closer to the temperature sensing element portion 51a than the lead bus bar 45v1. According to this structure, the displacement of the signal cable 51b toward the compressor side is prevented by the lead bus bar 45v1. Along with this, the displacement of the temperature sensing element portion 51a toward the compressor side is also difficult, and the movement of the temperature sensing element portion 51a being pulled out of the pocket 57 is prevented. Therefore, even when an external force is applied during assembly or resin molding, the temperature sensing element portion 51a is reliably retained in the pocket 57, and the possibility of positional displacement is low.

[0056] The pocket 57 for pre-fixing the temperature sensing element 51a is formed by cutting off a part of the end portion on the inner circumference side of the insulator 55, and no other mounting tool or the like is required to fix the temperature sensing element 51a. In addition, the existing lead bus bar 45v1 is also used to prevent the temperature sensing element 51a from being pulled out of the pocket 57, and no other mounting tool or the like is required. Therefore, compared with the case where the temperature sensing element 51a is installed using other mounting tools, the installation space can be reduced.

[0057] In addition, compared with the installation of the temperature sensing element 51a using other installation tools, the operation can be simplified and the manufacturing cost can be reduced. In addition, if the temperature sensing element 51a is installed using an adhesive or the like, the pre-fixing of the temperature sensing element 51a may be unstable due to the variation in the adhesive strength. In contrast, according to the stator 27 of this embodiment, the temperature sensing element 51a is pre-fixed more stably, and the operation is also simplified. In addition, the curing time of the adhesive is not required, and the production cycle time is also reduced, so the manufacturing cost can be reduced.

[0058] In addition, the signal cable 51b is embedded in the groove 42a of the insulating resin portion 42, so that even if the signal cable 51b is subjected to external force generated during assembly or resin molding, it will not easily float from the insulating resin portion 42 to the compressor side. Therefore, the position of the signal cable 51b is reliably maintained until it is fixed by the resin molding process, and the phenomenon that a part of the signal cable 51b is exposed to the outside of the molded resin 50 is suppressed.

[0059] In addition, in the motor 21 of the supercharger 1, the inner circumference of the stator 27 tends to become hot because it is away from the cooling water passage (not shown) disposed outside the stator 27 and close to the rotating rotor 25. Therefore, the temperature sensing element 51a of the thermistor 51 is preferably disposed on the inner circumference of the stator 27. In contrast, the pocket 57 is disposed at the front end of the core tooth portion 33, so that the temperature sensing element 51a can be disposed on the inner circumference of the stator 27.

[0060] The stator 27 is molded with a molded resin 50, and the molded resin 50 is also filled between the temperature sensing element 51a and the coil 35. Therefore, the heat of the coil 35 is transferred to the temperature sensing element 51a through the molded resin 50, and the temperature sensing element 51a can detect the heat of the coil 35 to be managed.

[0061] In addition, in order to detect the temperature of the coil 35 as directly as possible, the temperature sensing element portion 51a of the thermistor 51 is preferably arranged close to the coil 35. In contrast, the coil end portion 35a extends axially at a position adjacent to the pocket 57 in the circumferential direction. Therefore, the temperature sensing element portion 51a can be arranged close to the coil end portion 35a in the circumferential direction, and the temperature of the coil 35 can be detected with high sensitivity. In addition, the above-mentioned gap 57f is formed in the pocket 57, and the coil end portion 35a and the temperature sensing element portion 51a are close to each other through the gap 57f. In addition, the coil end portion 35a can also be in contact with the temperature sensing element portion 51a. Therefore, the gap 57f helps the temperature sensing element portion 51a to detect the temperature of the coil 35 as directly as possible.

[0062] The present disclosure is represented by the above-mentioned embodiments, and can be implemented in various ways obtained by implementing various changes and improvements based on the knowledge of those skilled in the art. In addition, the technical matters recorded in the above-mentioned embodiments can also be used to form a modified example. The structures of each embodiment, etc. can also be appropriately combined for use.

[0063] For example, in an embodiment, Figure 2 and Figure 3 In the figure, the inner side of the paper is described as the turbine side and the front side of the paper is described as the compressor side, but the turbine side and the compressor side in this case may be opposite. In addition, in the embodiment, the temperature sensing element portion 51a is provided in the electromagnet assembly 31 constituting the first V-phase coil 35v1, but the temperature sensing element portion 51a may be provided in any of the six electromagnet assemblies 31. In addition, the bus bar through which the signal cable 51b crosses may also be any of the lead bus bars 45u1, 45v1, 45w1 and the connecting bus bars 43u2, 43v2, 43w2, which may be determined according to the position of the electromagnet assembly 31 in which the temperature sensing element portion 51a is provided.

[0064] In the embodiment, an example is described in which the thermistor 51 is provided in one of the six electromagnet assemblies 31 of the stator 27 . However, for example, thermistors 51 may be provided in each of a plurality of electromagnet assemblies 31 , or a total of six thermistors 51 may be provided in each of all of the electromagnet assemblies 31 .

[0065] The present disclosure includes at least the following aspects.

[0066] [1] A supercharger, wherein:

[0067] An auxiliary motor unit is provided, which has a rotor provided on a rotating shaft connecting the turbine blades and the compressor blades, and a stator provided around the rotor.

[0068] The stator has:

[0069] stator core;

[0070] an insulator, which is arranged around the stator core;

[0071] a coil wound around the insulator;

[0072] a bus bar connected to one of the two ends of the coil, the coil end located on the inner peripheral side; and

[0073] The temperature measuring unit includes a temperature sensing element for detecting the temperature of the coil and a signal cable led out from the temperature sensing element.

[0074] The temperature sensing element is inserted into the element pocket provided in the insulator along the rotation axis direction of the auxiliary motor.

[0075] The signal cable is led out from the temperature sensing element in a direction opposite to a direction in which the temperature sensing element is inserted into the element pocket, and extends across the temperature sensing element side of the bus bar when viewed from the rotation axis direction.

[0076] [2] The supercharger according to [1], wherein:

[0077] The bus bar extends radially inward from an insulating member located on the outer peripheral side of the coil end portion and is connected to the coil end portion.

[0078] A portion of the signal cable between a portion crossing the bus bar and a cable end portion drawn out to the outside of the stator is fitted into a groove formed in the insulating member.

[0079] [3] The supercharger according to [1] or [2], wherein:

[0080] A plurality of electromagnet assemblies including the stator core, the insulator, and the coil are arranged in a circumferential direction.

[0081] When viewed from the axial direction, the bus bar extends radially between two adjacent electromagnet assemblies.

[0082] Both of the two signal cables led out from the temperature sensing element portion are led out from the temperature sensing element portion in a direction opposite to the direction in which the temperature sensing element portion is inserted into the element pocket, and extend in a manner transverse to the bus bar when viewed from the direction of the rotation axis and pass through the temperature sensing element portion side of the bus bar.

[0083] [4] The supercharger according to any one of [1] to [3], wherein:

[0084] The coil end portion extends in the axial direction and is disposed adjacent to the temperature sensing element portion in the element pocket in the circumferential direction.

[0085] [5] The supercharger according to any one of [1] to [4], wherein:

[0086] A mold resin is filled between the temperature sensing element and the coil.

[0087] [6] The supercharger according to any one of [1] to [5], wherein:

[0088] The element pocket has a gap formed therein so as to expose a portion of the temperature sensing element portion in the element pocket, and the coil and the temperature sensing element portion are brought into proximity through the gap.

[0089] Description of Reference Numerals

[0090] 1…supercharger; 6…turbine wheel; 7…compressor wheel; 14…rotating shaft; 21…motor (auxiliary motor part); 25…rotor; 27…stator; 31…electromagnet assembly; 35…coil; 35a…coil end; 42…insulating resin part (insulating member); 42a…groove; 43u2…connecting bus bar; 43v2…connecting bus bar; 43w2…connecting bus bar; 45u1…lead-out bus bar; 45v1…lead-out bus bar; 45w1…lead-out bus bar; 50…molding resin; 51…thermistor (temperature measuring part); 51a…temperature sensing element part; 51b…signal cable; 53…stator core; 55…insulator; 57…pocket (element pocket); 57f…gap; H…rotating axis.

Claims

1. A supercharger, characterized in that: An auxiliary motor unit is provided, which has a rotor provided on a rotating shaft connecting the turbine blades and the compressor blades, and a stator provided around the rotor. The stator has: stator core; an insulator, which is arranged around the stator core; a coil wound around the insulator; a bus bar connected to one of the two ends of the coil, the coil end located on the inner circumference side; as well as The temperature measuring unit includes a temperature sensing element for detecting the temperature of the coil and a signal cable led out from the temperature sensing element. The temperature sensing element is inserted into the element pocket provided in the insulator along the rotation axis direction of the auxiliary motor. The signal cable is led out from the temperature sensing element in a direction opposite to a direction in which the temperature sensing element is inserted into the element pocket, and extends across the temperature sensing element side of the bus bar when viewed from the rotation axis direction.

2. The supercharger according to claim 1, characterized in that: The bus bar extends radially inward from an insulating member located on the outer peripheral side of the coil end portion and is connected to the coil end portion. A portion of the signal cable between a portion crossing the bus bar and a cable end portion drawn out to the outside of the stator is fitted into a groove formed in the insulating member.

3. The supercharger according to claim 1, characterized in that: A plurality of electromagnet assemblies including the stator core, the insulator, and the coil are arranged in a circumferential direction. When viewed from the axial direction, the bus bar extends radially between two adjacent electromagnet assemblies. Both of the two signal cables led out from the temperature sensing element portion are led out from the temperature sensing element portion in a direction opposite to the direction in which the temperature sensing element portion is inserted into the element pocket, and extend in a manner transverse to the bus bar when viewed from the direction of the rotation axis and pass through the temperature sensing element portion side of the bus bar.

4. The supercharger according to claim 1, characterized in that: The coil end portion extends in the axial direction and is disposed adjacent to the temperature sensing element portion in the element pocket in the circumferential direction.

5. The supercharger according to claim 1, characterized in that: A mold resin is filled between the temperature sensing element portion and the coil.

6. The supercharger according to claim 1, characterized in that: The element pocket has a gap formed therein so as to expose a portion of the temperature sensing element portion in the element pocket, and the coil and the temperature sensing element portion are brought into proximity through the gap.

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