Rotating Electric Machine

Abstract

To provide a rotary electric machine capable of preventing looseness of a lead-out line against a terminal board, and allowing a suppression of the number of components.SOLUTION: A rotary electric machine comprises: a stator that comprises a stator coil 16; a lead-out line 30 that is led out from the stator coil 16 and has a first terminal; external wiring 33 that is led in from outside and has a second terminal; a terminal board 12 that is formed by an insulation material, and to which the first terminal and the second terminal are fixed; a terminal connection part in which the first terminal and the second terminal are electrically connected; and a housing space in which the lead-out line 30 is housed. In the rotary electric machine, the lead-out line 30 is folded by an elastic deformation in the housing space, and the first terminal is excited toward the terminal board 12 in reception of a restitutive force of the lead-out line 30.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine such as an electric motor. [Background technology]

[0002] In a conventional electric motor, for example, the motor-side lead wire drawn from the stator coil is fixed to a resin terminal block via a relay terminal and electrically connected to external wiring (see, for example, Patent Document 1). In this type of terminal block, the relay terminal is used so that pressure that would cause creep is not applied to the terminal block, and as a result, loosening due to creep or the like in the terminal block can be prevented. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-131067 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the electric motor disclosed in Patent Document 1 requires the preparation of a terminal block that requires an intermediate terminal for connection to external wiring, which increases the number of parts in the terminal block. If the motor side lead wires and the external wiring are fixed to the terminal block simply using bolts and nuts without using intermediate terminals, pressure that can cause creeping will be applied to the terminal block, and if creeping occurs in the terminal block, the lead wires will loosen from the terminal block.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a rotating electric machine that can prevent loosening of lead wires from a terminal block and that can reduce the number of parts. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention providesA rotor having a rotating shaft, a stator core, and A rotating electric machine including a stator having a stator coil, a lead wire drawn from the stator coil and having a first terminal, an external wiring drawn from the outside and having a second terminal, a terminal block formed of an insulating material and to which the first terminal and the second terminal are fixed, a terminal connection part to which the first terminal and the second terminal are electrically connected, and an accommodation space in which the lead wire is accommodated, wherein the lead wire is folded back by elastic deformation in the accommodation space. The folded line part and , a coil side wire portion extending between the folded wire portion and the stator coil, and a terminal side wire portion extending between the folded wire portion and the first terminal, and by folding back the lead-out wire, an acute angle is formed between the axis of the coil side wire portion and the axis of the terminal side wire portion, and the coil side wire portion and the terminal side wire portion overlap when viewed from a specific direction, and the coil side wire portion protrudes radially outward from the rotating shaft near a base portion on the coil end side of the stator coil and is bent further toward the stator, and an obtuse angle is formed between the axis of the base portion on the coil end side of the coil side wire portion and the axis of a portion on the folded wire portion side, The first terminal is biased toward the terminal block by a restoring force from elastic deformation of the lead wire.

[0007] In the present invention, the lead wire is folded back in the accommodation space by elastic deformation, and the first terminal is biased toward the terminal block by the restoring force of the lead wire. Therefore, even if creep occurs in the terminal block, the first terminal is pressed against the terminal block by the restoring force of the lead wire, so that the lead wire can be prevented from loosening from the terminal block.

[0008] Also , pull The folded wire portion of the output wire is elastically deformed to a greater extent by folding back compared to the coil side wire portion and the terminal side wire portion, so that a sufficient biasing force to the first terminal can be ensured.

[0009] In the above rotating electric machine, the lead wire may be configured to be folded back a number of times within the accommodation space. In this case, since the lead wire is folded back multiple times in the accommodation space, the restoring force can be increased compared to when the lead wire is folded back once, and the biasing force on the first terminal can be increased, so that the lead wire can be more reliably prevented from coming loose from the terminal block.

[0010] In the above rotating electric machine, the terminal connection portion may have a bolt and a nut that fix the first terminal and the second terminal to the terminal block. In this case, the first terminal is pressed against the terminal block by the restoring force of the lead wire, preventing the lead wire from loosening from the terminal block, and the first and second terminals can be fixed to the terminal block with bolts and nuts. As a result, there is no need to use an intermediate terminal, and the number of parts can be reduced.

[0011] In the above rotating electric machine, the first terminal may be integrated with the bolt. In this case, by integrating the first terminal with the bolt, the number of parts of the rotating electric machine can be reduced, which makes it possible to reduce the manufacturing cost of the rotating electric machine and to facilitate the assembly work of the rotating electric machine.

[0012] In the above rotating electric machine, the first terminal may be a crimp terminal having a holding portion that holds an end of the lead wire and a crimping portion that is crimped by the bolt. In this case, by using a crimp terminal as the first terminal, the manufacturing costs of the rotating electric machine can be reduced.

[0013] In the above rotating electric machine, the pressure-bonding portion may be bent with respect to the holding portion. In this case, since the crimping portion is bent with respect to the holding portion, it is possible to change the connection direction of the external wiring. Effect of the Invention

[0014] According to the present invention, it is possible to provide a rotating electric machine that can prevent loosening of lead wires from a terminal block and that can reduce the number of parts. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical sectional view showing an overview of an electric motor according to a first embodiment. [Diagram 2] FIG. 1 is a plan view of an electric motor according to a first embodiment. [Diagram 3] FIG. 1 is a front view of an electric motor according to a first embodiment. [Figure 4]1 is a vertical sectional view showing a main part of an electric motor according to a first embodiment. [Diagram 5] FIG. 6 is a vertical cross-sectional view showing a main part of an electric motor according to a second embodiment. [Figure 6] FIG. 11 is a vertical cross-sectional view showing a main part of an electric motor according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric motor as a rotating electric machine according to a first embodiment will now be described with reference to the drawings. The electric motor of this embodiment is a three-phase synchronous electric motor.

[0017] As shown in Fig. 1, an electric motor 10 includes a motor body 11 and a terminal block 12 fixed to the motor body 11. The motor body 11 includes a stator 13 and a rotor 14 that rotates inside the stator 13. The stator 13 includes a stator core 15 and a stator coil 16, and coil ends 17 of the stator coil 16 are formed on both ends of the stator core 15. In Fig. 1, only the coil end 17 at one end is shown, and the coil end 17 at the other end is not shown. The rotor 14 includes a rotor core 18 and a rotating shaft 19 that is fixed to the rotor core 18 and passes through the center of the rotor core 18.

[0018] 1, a first end bracket 20 covering one coil end 17 is provided at one end of stator 13, and a second end bracket 21 covering the other coil end 17 is provided at the other end. The first end bracket 20 and the second end bracket 21 are fixed to stator 13 with a through bolt 22. The first end bracket 20 is provided with a bearing 23, and the first end bracket 20 rotatably supports the rotating shaft 19 via the bearing 23. The second end bracket 21 is provided with a bearing (not shown), and the second end bracket 21 supports the rotating shaft 19 via a bearing not shown.

[0019] A shaft hole 24 passes through the center of the first end bracket 20, and an end of the rotating shaft 19 is inserted into the shaft hole 24 and protrudes to the outside from the first end bracket 20. The end of the rotating shaft 19 protruding from the first end bracket 20 is an output shaft portion. The direction of the axis P of the rotating shaft 19 is approximately horizontal.

[0020] In this embodiment, the first end bracket 20 corresponds to a base to which the terminal block 12 is fixed. As shown in Fig. 2 and Fig. 3, the upper surface of the first end bracket 20 supports the terminal block 12. The upper surface of the first end bracket 20 is formed with a plurality of screw holes 26 into which bolts 25 for fixing the terminal block 12 are screwed. For ease of explanation, part of the terminal block 12 is broken away in Fig. 2.

[0021] As shown in Figs. 1 and 4, the first end bracket 20 is formed with a motor-side space 27 that penetrates from an upper portion of the first end bracket 20 to the coil end 17. The motor-side space 27 is a space through which a lead wire 30 from the electric motor 10, which will be described next, is inserted. The motor-side space 27 is generally rectangular in plan view. As shown in Figs. 2 and 3, the first end bracket 20 has a front wall 28 on the front side that faces the motor-side space 27 in the axial direction of the rotating shaft 19, and side walls 29 located on both sides of the motor-side space 27 in the width direction perpendicular to the axial direction of the rotating shaft 19.

[0022] As shown in Fig. 2 and Fig. 3, a plurality of lead wires 30 on the electric motor 10 side are led out from the coil end 17 on the first end bracket 20 side. The plurality of lead wires 30 are power lines for supplying power to the stator coil 16, and are three-phase wiring consisting of a U-phase lead wire 30U, a V-phase lead wire 30V, and a W-phase lead wire 30W. The U-phase lead wire 30U, the V-phase lead wire 30V, and the W-phase lead wire 30W are connected to the terminal block 12. The lead wires 30 include a plurality of conductor wires bundled together for each phase, and the bundled plurality of conductor wires are coated with an insulating coating.

[0023] The ends of the plurality of lead wires 30 are provided with a bolt 31 and a retaining metal fitting 32 which is formed integrally with the bolt 31 and holds the ends of the lead wires 30. The bolt 31 is made of a metal having excellent conductivity (e.g., brass). The retaining metal fitting 32 is also made of a metal having excellent conductivity and corresponds to a first terminal. The retaining metal fitting 32 is a cylindrical metal fitting connected to the head of the bolt 31. The tip of the lead wire 30 is held by the retaining metal fitting 32 by crimping, welding, or the like. The axis of the end of the lead wire 30 and the axis of the shaft of the bolt 31 are substantially coaxial. Since the bolt 31 and the retaining metal fitting 32 are formed integrally, it can be said that the first terminal is integrated with the bolt 31.

[0024] Bolt 31 and retaining metal fitting 32 are provided at the ends of U-phase lead-out wire 30U, V-phase lead-out wire 30V, and W-phase lead-out wire 30W. Specifically, bolt 31U and retaining metal fitting 32U are provided at the end of U-phase lead-out wire 30U, bolt 31V and retaining metal fitting 32V are provided at the end of V-phase lead-out wire 30V, and bolt 31W and retaining metal fitting 32W are provided at the end of W-phase lead-out wire 30W.

[0025] On the other hand, a plurality of external wirings 33 connected to an external device (for example, an inverter) are connected to the terminal block 12. The plurality of external wirings 33 are three-phase wirings including a U-phase external wiring 33U, a V-phase external wiring 33V, and a W-phase external wiring 33W. The number of the external wirings 33 is the same as the number of the lead wires 30. The ends of the plurality of external wirings 33 are each provided with a round crimp terminal 34 as a second terminal. Specifically, as shown in FIG. 3, the end of the U-phase external wiring 33U is provided with a crimp terminal 34U, the end of the V-phase external wiring 33V is provided with a crimp terminal 34V, and the end of the W-phase external wiring 33W is provided with a crimp terminal 34W. A bolt 31 is inserted through the crimp terminal 34 of the external wiring 33, and a nut 35 is fastened to the bolt 31, whereby the lead wire 30 and the external wiring 33 are electrically connected. The bolt 31, the nut 35, the retaining metal fitting 32 and the crimp terminal 34 constitute a terminal connection portion.

[0026] Next, the terminal block 12 will be described. The terminal block 12 is formed of resin, which is an insulating material, and electrically connects the multiple lead wires 30 and the multiple external wirings 33. As shown in Fig. 1, the terminal block 12 of this embodiment is attached to the first end bracket 20 by fastening a bolt 25 so as to be located at the top of the electric motor 10. As shown in Fig. 2, the terminal block 12 includes a terminal block main body 41 and a flange portion 42 integrally formed around the terminal block main body 41.

[0027] As shown in FIG. 2, the terminal block body 41 has a first side wall portion 43, a second side wall portion 44, a pair of third side wall portions 45, and a top wall portion 46, which rise from the flange portion 42. The first side wall portion 43 is a side wall portion on the output shaft side of the rotating shaft 19, and the second side wall portion 44 is a side wall portion facing the first side wall portion 43. The pair of third side wall portions 45 are side wall portions connecting between the first side wall portion 43 and the second side wall portion 44. The top wall portion 46 is a wall portion covering an area surrounded by the first side wall portion 43, the second side wall portion 44, and the pair of third side wall portions 45. The first side wall portion 43 is formed with three through holes 47 through which the bolts 31 of the lead wire 30 are inserted. Only one through hole 47 is shown in FIG. 4.

[0028] The flange portion 42 is formed so as to surround the terminal block main body 41. A through hole (not shown) for inserting the bolt 25 is formed in the flange portion 42 near the third side wall portion 45. When the terminal block 12 is fixed to the first end bracket 20, a terminal block side space portion 49 that communicates with the motor side space portion 27 is formed (see Figures 1 and 4). The motor side space portion 27 and the terminal block side space portion 49 correspond to an accommodation space that accommodates the lead wire 30. The accommodation space formed by the motor side space portion 27 and the terminal block side space portion 49 is an enclosed space.

[0029] In the present embodiment, the head of the bolt 31 of the lead wire 30 abuts against the inner surface of the first side wall 43 of the terminal block 12, and the crimp terminal 34 of the external wiring 33 abuts against the outer surface of the first side wall 43. Then, the bolt 31 and the crimp terminal 34 are fixed to the terminal block 12 by fastening the nut 35, sandwiching the first side wall 43. Therefore, the external wiring 33 extends upward from the first side wall 43. The first side wall 43 receives an axial force due to the fastening of the bolt 31 and the nut 35. The terminal block 12, which is made of resin, may experience a creep phenomenon due to the axial force generated by fastening the bolt 31 and the nut 35. However, in the present embodiment, a design is made such that the lead wire 30 is unlikely to loosen from the terminal block 12 even if a creep phenomenon occurs.

[0030] As shown in Fig. 4, the lead wire 30 has a folded wire portion 51 folded back between a base portion on the coil end 17 side and a tip portion on the bolt 31 side. The lead wire 30 also has a coil side wire portion 52 extending between the folded wire portion 51 and the stator coil 16, and a terminal side wire portion 53 extending between the folded wire portion 51 and the first terminal. In Fig. 4, for ease of explanation, the boundaries of the wire portions are shown diagrammatically by dotted lines. Since a part of the lead wire 30 is folded back at the folded wire portion 51, the axis of the coil side wire portion 52 and the axis of the terminal side wire portion 53 form an acute angle, and the coil side wire portion 52 and the terminal side wire portion 53 of the lead wire 30 overlap when viewed from a specific direction (above).

[0031] The coil side wire portion 52 is bent so as to protrude radially outward from the rotary shaft 19 near the base portion on the coil end 17 side and further toward the stator core 15. Oke An obtuse angle is formed between the axis of base portion 52A on the coil end 17 side and the axis of portion 52B on the folded-back wire portion 51 side. In other words, although the coil side wire portion 52 is bent, it is not folded back like the folded-back wire portion 51. Therefore, the elastic deformation of the coil side wire portion 52 is smaller than that of the folded-back wire portion 51. The terminal side wire portion 53 is slightly curved but extends in a substantially straight line from the folded-back wire portion 51 to the bolt 31.

[0032] Incidentally, since the folded wire portion 51 is deformed in a manner that includes elastic deformation, a restoring force that attempts to restore the deformation is generated. Moreover, since the coil side wire portion 52 is bent, elastic deformation also occurs in the coil side wire portion 52, and a restoring force is generated in the coil side wire portion 52. The restoring force of the folded wire portion 51 is greater than the restoring force of the coil side wire portion 52, which is not folded back but is bent. Since these restoring forces attempt to straighten the lead-out wire 30, the bolt 31 is subjected to these restoring forces.

[0033] The restoring force of the lead wire 30, which is the combination of the folded wire portion 51 and the coil side wire portion 52, can be broken down into a component parallel to the axial direction of the rotating shaft 19 and a component in the radial direction of the rotating shaft 19. Therefore, the component parallel to the axial direction of the rotating shaft 19 in the restoring force of the lead wire 30 is applied to the bolt 31 as a biasing force that presses the bolt 31 against the terminal block 12 in the axial direction of the bolt 31. In other words, the bolt 31 is constantly pressed against the terminal block 12 by the biasing force. Note that the folded wire portion 51 and the coil side wire portion 52 may undergo plastic deformation in addition to elastic deformation, but most of the deformation is elastic, and the plastic deformation does not eliminate the restoring force of the elastic deformation.

[0034] Next, the operation of the electric motor 10 of this embodiment will be described. As shown in Fig. 4, the lead wire 30 has a folded wire portion 51 where it is folded back, and further, the coil side wire portion 52 is bent near the base portion on the coil end 17 side. Therefore, the restoring force generated in the folded wire portion 51 and the coil side wire portion 52 acts as a biasing force on the bolt 31, pressing the bolt 31 against the terminal block 12. Therefore, even if a creep phenomenon occurs in the terminal block 12 due to fastening the bolt 31 and the nut 35, the bolt 31 is pressed against the terminal block 12 by the biasing force based on the restoring force of the lead wire 30, and therefore the bolt is unlikely to come loose from the terminal block 12.

[0035] The electric motor 10 of the present embodiment provides the following advantages. (1) The lead wire 30 is folded back due to elastic deformation in the accommodation space, and the bolt 31 and the retaining metal fitting 32 are urged toward the terminal block 12 by the restoring force of the lead wire 30. Therefore, even if creep occurs in the terminal block 12, the bolt 31 and the retaining metal fitting 32 are pressed against the terminal block 12 by the restoring force of the lead wire 30, so that the lead wire 30 can be prevented from loosening from the terminal block 12.

[0036] (2) The lead-out wire 30 has a folded-back wire portion 51 that is folded back in the accommodation space by elastic deformation, a coil side wire portion 52 that extends between the folded-back wire portion 51 and the stator coil 16, and a terminal side wire portion 53 that extends between the folded-back wire portion 51 and the first terminal. Therefore, the folded-back wire portion 51 in the lead-out wire 30 is elastically deformed to a greater extent by folding back compared to the coil side wire portion 52 and the terminal side wire portion 53, so that a sufficient biasing force on the bolt 31 and the retaining metal fitting 32 can be ensured.

[0037] (3) The bolt 31 and the retaining metal fitting 32 are pressed against the terminal block 12 by the restoring force of the lead wire 30, preventing the lead wire 30 from loosening from the terminal block 12, and therefore the first terminal and the crimp terminal 34 can be fixed to the terminal block 12 by the bolt 31 and the nut 35. As a result, there is no need to use an intermediate terminal, and the number of parts can be reduced.

[0038] (4) Since the retaining metal fittings 32 are integrated with the bolts 31, the number of parts of the electric motor 10 can be reduced, which reduces the manufacturing cost of the electric motor 10 and simplifies the assembly work of the electric motor 10.

[0039] (5) The folded wire portion 51 of the lead-out wire 30 is folded back by elastic deformation in the accommodation space, while the coil side wire portion 52 is bent without being folded back. Therefore, the restoring force of the lead-out wire 30 including the folded wire portion 51 and the coil side wire portion 52 is applied to the bolt 31 as a biasing force that presses the bolt 31 and the retaining metal fitting 32 against the terminal block 12 in the axial direction of the bolt 31. As a result, the biasing force applied to the bolt 31 and the retaining metal fitting 32 can be increased compared to the biasing force of the folded wire portion 51 alone.

[0040] Second Embodiment Next, an electric motor according to a second embodiment will be described. This embodiment differs from the first embodiment in the configuration of the first end of the lead wire and the terminal block. In this embodiment, the same configuration as in the first embodiment will be referred to and the same reference numerals will be used.

[0041] 5, the electric motor 60 includes a terminal block 61 fixed to the first end bracket 20. The terminal block 61 includes a terminal block main body 62 and a flange portion (not shown) integrally formed around the terminal block main body 62.

[0042] As shown in FIG. 5, the terminal block main body 62 has a first side wall portion 63, a second side wall portion 64, a pair of third side wall portions 65 (only one of which is shown), and a top wall portion 66. Three through holes 67 corresponding to the U-phase, V-phase, and W-phase are formed in the top wall portion 66. A thick base 68 is formed around the through holes 67. The flange portion is fixed by the bolt 25, so that the terminal block 61 is fixed to the upper surface of the first end bracket 20, and a terminal block side space portion 69 communicating with the motor side space portion 27 is formed. The motor side space portion 27 and the terminal block side space portion 69 correspond to the accommodation space that accommodates the lead wire 30. Note that in FIG. 5, only the through hole 67V and the base 68V corresponding to the V-phase are shown.

[0043] The tip of the lead wire 30 is provided with a round, unbent crimp terminal 71 as a first terminal. The crimp terminal 71 has a holding portion 73 that holds the tip of the lead wire 30 and a crimping portion 72 that is crimped by a bolt 74. The crimp terminal 71 is fixed to the inner surface of the top wall portion 66 by fastening the bolt 74 and the nut 35. The crimp terminal 34 of the external wiring 33 is fixed to the base 68 by fastening the bolt 74 and the nut 35. Therefore, the external wiring 33 extends in the horizontal direction from the top wall portion 66. The lead wire 30 in the accommodation space is in approximately the same state as in the first embodiment, and the radial component of the rotating shaft 19 based on the restoring force of the lead wire 30 urges the crimp terminal 71 as an urging force that presses the crimp terminal 71 against the top wall portion 66.

[0044] This embodiment has the same advantages as the advantages (1) to (3) and (5) of the first embodiment. In addition, since the lead wire 30 includes the crimp terminal 71, the first terminal can be made less expensive than the first end of the lead wire 30 of the first embodiment.

[0045] (Third embodiment) Next, an electric motor according to a third embodiment will be described. This embodiment differs from the first embodiment in the configuration of the first end of the lead wire, the terminal block, and the lead wire. In this embodiment, the same configuration as in the first embodiment will be described with reference to the first embodiment, and common reference numerals will be used.

[0046] 6, the electric motor 80 includes a terminal block 81 fixed to the first end bracket 20. The terminal block 81 includes a terminal block main body 82 and a flange portion 83 integrally formed around the terminal block main body 82.

[0047] As shown in Fig. 6, the terminal block main body 82 has a first side wall portion 84, a second side wall portion 85, a pair of third side wall portions 86 (only one of which is shown), and a top wall portion 87. Three through holes 88 corresponding to the U-phase, V-phase, and W-phase are formed in the top wall portion 87. The flange portion 83 is fixed by the bolts 25, so that the terminal block 81 is fixed to the upper surface of the first end bracket 20, and a terminal block side space portion 89 communicating with the motor side space portion 27 is formed. The motor side space portion 27 and the terminal block side space portion 89 correspond to the accommodation space that accommodates the lead wire 30. Note that only the through hole 88V corresponding to the V-phase is shown in Fig. 6.

[0048] The tip of the lead wire 30 is provided with a round crimp terminal 91 as a first terminal. The crimp terminal 91 has a holding portion 92 that holds the tip of the lead wire 30, and a crimping portion 93 that is crimped by a bolt 94. The crimp terminal 91 is a bent terminal in which the holding portion 92 and the crimping portion 93 are bent at approximately 90°. In other words, the crimping portion 93 is bent at approximately 90° with respect to the holding portion 92. The crimp terminal 91 is fixed to the inner surface of the top wall portion 87 by fastening the bolt 94 and the nut 35. In addition, the crimp terminal 34 of the external wiring 33 is fixed to the top wall portion 87 by fastening the bolt 94 and the nut 35. Therefore, the external wiring 33 extends horizontally from the top wall portion 87.

[0049] The lead wire 30 in the storage space is accommodated in a state different from that of the first embodiment. The lead wire 30 has a first folded wire portion 95 and a second folded wire portion 96 as folded wire portions. The lead wire 30 also has a coil side wire portion 97 extending between the first folded wire portion 95 and the stator coil 16, an intermediate wire portion 98 extending between the first folded wire portion 95 and the second folded wire portion 96, and a terminal side wire portion 99 extending from the second folded wire portion 96 to the tip. In FIG. 6, for convenience of explanation, the boundaries of the wire portions are typically shown by dotted lines. The lead wire 30 is folded back twice so as to be generally S-shaped as a whole. The axis of the coil side wire portion 97 and the axis of the intermediate wire portion 98 form an acute angle, and the axis of the intermediate wire portion 98 and the axis of the terminal side wire portion 99 also form an acute angle. Therefore, the coil side wire portion 97, the intermediate wire portion 98, and the terminal side wire portion 99 of the lead wire 30 overlap each other when viewed from a specific direction (the axial direction of the rotating shaft 19).

[0050] Since the first folded line portion 95 and the second folded line portion 96 are deformed in a manner including elastic deformation, restoring forces are generated to restore the deformation. These restoring forces attempt to straighten the lead wire 30, so that the radial component of the restoring force of the lead wire 30 with respect to the rotation shaft 19 is applied to the crimp terminal 91 as a biasing force that presses the crimp terminal 91 against the top wall portion 87.

[0051] This embodiment has the same effects as the effects (1) to (3) of the first embodiment. In addition, the lead wire 30 has two folded line portions, and is therefore folded back twice in the accommodation space. Therefore, compared to the case where the lead wire 30 is folded back once, the restoring force can be increased, and the urging force on the crimp terminal 91 as the first terminal is increased. As a result, the lead wire 30 can be more reliably prevented from loosening from the terminal block 81.

[0052] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.

[0053] In the above embodiment, a three-phase synchronous motor is used as an electric motor serving as a rotating electric machine, but this is not intended to limit the type of the rotating electric machine. The rotating electric machine may be, for example, a generator motor, and the electric motor may be, for example, a three-phase induction motor. In the above embodiment, the lead line is folded back once or twice, but this is not limiting. The lead line may be folded back a plurality of times, i.e., three or more times. In the above embodiment, the terminal block is configured to seal the housing space, but this is not limiting. For example, the terminal block may be configured so that the housing space communicates with an external space. In the second embodiment, a crimp terminal that is not a bent terminal is used as the first terminal of the lead wire, but a crimp terminal that is a bent terminal may be used. In this case, a through hole for a bolt may be provided in the first side wall portion so that the crimp terminal is fixed to the first side wall portion instead of the top wall portion. [Explanation of symbols]

[0054] 10, 60, 80 Electric motor (rotating electric machine) 11 Motor body 12, 61, 81 terminal block 13 Stator 14 Rotor 15 Stator core 16 Stator coil 18 Rotor core 19 Rotational Axis 27 Motor side space 30 Leader 31, 71, 94 volts 32 Retaining bracket 33 External wiring 34, 67, 71, 91 Crimp terminal 35 Nut 49 Terminal block side space 51 Folding line section 52, 97 Coil side wire 53, 99 Terminal side wire 72, 92 Holding part 73, 93 Crimping part 74, 94 volts 95 First turn line section 96 Second fold line section 99 Terminal side wire

Claims

1. A rotor having a rotating shaft; a stator including a stator core and a stator coil; a lead wire extending from the stator coil and having a first terminal; an external wiring that is led in from the outside and has a second terminal; a terminal block formed of an insulating material and to which the first terminal and the second terminal are fixed; a terminal connection portion at which the first terminal and the second terminal are electrically connected; and a storage space for storing the lead wire. The lead wire has a folded line portion that is folded back by elastic deformation in the accommodation space; a coil side wire portion extending between the folded wire portion and the stator coil; a terminal side line portion extending between the folded line portion and the first terminal, By folding back the lead-out wire, an acute angle is formed between an axis of the coil side wire portion and an axis of the terminal side wire portion, and the coil side wire portion and the terminal side wire portion overlap when viewed from a specific direction, the coil side wire portion protrudes radially outward from the rotating shaft near a base portion on a coil end side of the stator coil and is bent toward the stator core, an obtuse angle is formed between an axis of a base portion of the coil side wire portion on the coil end side and an axis of a portion of the folded wire portion side, The rotating electric machine according to claim 1, wherein the first terminal is biased toward the terminal block by a restoring force caused by elastic deformation of the lead wire.

2. A rotating electric motor as described in claim 1, characterized in that the lead wire is folded back multiple times within the accommodating space.

3. A rotating electric motor as described in claim 1 or 2, characterized in that the terminal connection portion has a bolt and a nut that fix the first terminal and the second terminal to the terminal block.

4. A rotating electric motor as described in claim 3, characterized in that the first terminal is integrated with the bolt.

5. The first terminal is A holding portion for holding a tip of the lead wire; 4. The rotating electric machine according to claim 3, wherein the terminal is a crimp terminal having a crimp portion that is crimped by the bolt.

6. A rotating electric motor as described in claim 5, characterized in that the crimping portion is bent relative to the retaining portion.

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