JP2007166822A - Polyphase ac rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyphase AC rotary electric machine that suppresses temperature rise in the output terminal and a nut for preventing an insulating bush from dissolving, and suppresses increase in an electrical resistance value in the bolt. <P>SOLUTION: The polyphase AC rotary electric machine comprises a stator winding terminal 22, provided at one end of polyphase stator winding 17d; the bolt 23 inserted into the stator winding terminal 22; an insulating member 25, having an insertion section into which the bolt 23 is inserted; a holding member 26, in which a section 26a is provided to be pressed in into which the bolt 23 is pressed; and the nut 27, that is screwed to the bolt 23 and is made of a conductive metal. The nut 27 is screwed to the bolt 23 pressed in the section 26a to be pressed, thus crimping the holding member 26 interposed in between the head 23c of the bolt 23 and the nut 27, and the stator wiring terminal 22, and electrically connecting the stator wiring terminal 22 to the bolt 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multiphase AC rotating electrical machine used in, for example, a vehicle, and more particularly to a terminal structure of a multiphase AC rotating electrical machine that is electrically connected to an external device.

  In a conventional multi-phase AC rotating electric machine, the head of the output terminal made of a conductive member is brought into close contact with one of the axial end surfaces of the flange portion of the positive-side heat sink provided in the rectifier, and the output A male screw portion of the terminal extends from the other of the axial end surfaces of the positive electrode heat sink, and a nut made of a conductive member is screwed to the male screw portion, and the nut is the other of the axial end surfaces of the positive electrode heat sink. The output terminal is fixed to the positive-side heat sink. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2005-12936 (8th and 9th pages, FIG. 7)

  In the conventional multi-phase AC rotating electric machine, the rectifier becomes high when converting AC current into DC current, and the head of the output terminal is placed on one of the axial end surfaces of the flange portion of the positive heat sink that dissipates it. Is in close contact with the surface contact state, and the nut screwed to the male screw portion on the other side is in close contact with the surface contact state, so that the heat of the positive-side heat sink is transmitted and the temperature of the output terminal and the nut is In order to insulate the nut and the bracket forming the outer shape of the multiphase AC rotating electric machine, there is a problem that an insulating bush made of resin provided on the radially outer peripheral surface of the nut is melted. Further, the temperature of the output terminal rises and the electrical resistance value becomes large, and there is a problem that the output terminal further generates heat and the temperature further rises.

  The present invention provides a multi-phase AC rotating electrical machine in which the temperature rise of the output terminal and the nut is suppressed to prevent the insulation bush from being melted and the electrical resistance value of the bolt is suppressed from increasing. The purpose is to do.

  In the multi-phase AC rotating electric machine according to the present invention, the rotor provided on the shaft, the bracket that rotatably supports the shaft, and the bracket fixed to the bracket, facing the rotor via a radial minute gap. A stator winding terminal provided at one end of a multi-phase stator winding wound around the stator, and a conductive metal inserted through the stator winding terminal. A bolt, an insulating member attached to the bracket and provided with an insertion portion through which the bolt is inserted, and a pressed-in portion into which the bolt is press-fitted are fixed to the insertion portion of the insulating member. A holding member and a nut made of a conductive metal screwed to the bolt, and the nut is screwed to the bolt press-fitted into the press-fit portion of the holding member, whereby the bolt Head and front Wherein said stator winding terminals interposed between the nut bolts are those that are electrically connected.

  In this invention, since the bolt is pressed into the holding member fixed to the insertion portion of the insulating member instead of the positive-side heat sink, the heat of the positive-side heat sink causes the bolt and the nut to heat. Therefore, melting of the insulating member is prevented. Further, the head of the bolt, the stator winding terminal, the holding member, and the nut are crimped, and the stator winding terminal and the bolt interposed between the head of the bolt and the nut. In order to electrically insulate the bolt and the bracket in accordance with the increase in the temperature of the bolt and the nut due to heat generation, the contact resistance of the head becomes small because the contact area becomes large. The melting of the insulating member provided so as to surround the radially outer side of the nut screwed to the bolt is prevented.

Embodiment 1
As an example of a multi-phase AC rotating electric machine, FIG. 1 shows an axial cross-sectional view of a three-phase AC rotating electric machine that is a motor generator having a motor function and a generator function according to Embodiment 1 of the present invention. As shown in FIG. 1, the rotor 2 of the three-phase AC rotating electrical machine 1 is provided on a shaft 3, and the rotor 2 further includes a first magnetic pole core 4 and a second magnetic pole iron core 5 for transmitting magnetic flux. Is formed. The first boss portion 4a constituting the first magnetic pole core 4 is provided with a first insertion hole 4b for inserting the shaft 3 at the axial center position. Further, a ring-shaped first yoke portion 4c extends radially outward from one axial end of the first boss portion 4a, and further, the first boss portion 4c extends from the outer periphery to the first axial end. A claw-shaped magnetic pole portion 4d is extended.

  On the other hand, the second boss portion 5 a constituting the second magnetic pole core 5 is provided with a second insertion hole 5 b for inserting the shaft 3 at the axial center position, similarly to the first magnetic pole core 4. Further, a ring-shaped second yoke portion 5c extends radially outward from one axial end of the second boss portion 5a, and further from the outer periphery of the second yoke portion 5c to the second axial end. A claw-shaped magnetic pole portion 5d is extended. The second claw-shaped magnetic pole portion 5d is disposed so as to mesh with the first claw-shaped magnetic pole portion 4d, and the first magnetic pole iron core 4 and the second magnetic pole iron core 5 are connected to the second boss portion 5a. In the state where the end portion in the axial direction of the yoke portion side is abutted with the end surface in the axial direction of the first boss portion 4a, the magnetic pole cores are attached to each other so as not to rotate relative to each other.

Further, a bobbin 6 is provided radially outward of the first boss 4a and the second boss 5a, and a field winding 7 is wound radially outward of the bobbin 6. . When a field current is applied to the field winding 7, the first claw-shaped magnetic pole portion 4 d of the first magnetic pole core 4 constituting the rotor 2 and the second claw of the second magnetic pole iron core 5. The magnetic pole portion 5d is magnetized so that the positive and negative polarities change alternately along the circumferential direction.
The field winding 7 is electrically connected to a slip ring 9 provided on the shaft 3 via a wire 8, and further, a field current control is performed via a brush 10 in contact with the slip ring 9. Is electrically connected to an external device (not shown).

  A cooling fan 11 and a cooling fan 12 are provided on both axial end surfaces of the rotor 2.

  The rear bracket 13 and the front bracket 14 are configured such that the rear bracket 13 rotatably supports one end of the shaft 3 in the axial direction via a rear bearing 15, and the front bracket 14 supports the shaft 3 via a front bearing 16. The other end in the axial direction is rotatably supported. Thus, the rotor 2 provided on the shaft 3 is rotatably disposed in the rear bracket 13 and the front bracket 14.

  The stator 17 is opposed to the rotor 2 via a minute radial gap, and the rear bracket 13 together with the front bracket 14 is shoulders at both axial ends of a stator core 17a constituting the stator 17. The stator core 17a is clamped by a through bolt 18 with the portion 17b and the shoulder portion 17c interposed therebetween. A three-phase stator winding 17d is wound around the stator core 17a, and a lead wire 17e is provided at one end of each phase. Further, a pulley 19 driven by an engine (not shown) is fixed to an end portion of the shaft 3 extending from the front bracket 14 to the outside. The pulley 19 is fixed to the shaft 3 by screwing a nut 20.

  The rear bracket 13 is provided with an attachment hole 13a for attaching the three-phase AC rotating electrical machine 1 to the engine (not shown), an intake hole 13b through which cooling air for internal cooling is sucked, and the cooling air is discharged. An exhaust hole 13c is formed. A resolver 21 that detects the rotational position of the rotor 2 is provided on the axial end surface of the shaft 3 on the side opposite to the pulley. Further, the front bracket 14 has an attachment hole 14a for attaching the three-phase AC rotating electrical machine 1 to the engine (not shown), an intake hole 14b through which cooling air for internal cooling is sucked, and the cooling air is discharged. An exhaust hole 14c is formed.

  FIG. 2 is a diagram showing a terminal structure of the three-phase AC rotating electric machine 1. In FIG. 2, FIG. 2A is a partial cross-sectional view in the enlarged axial direction of the main part of the three-phase AC rotating electric machine 1. As shown in FIG. 2A, the lead wire 17 e is electrically connected to the stator winding terminal 22. FIG. 2B is a front view of the stator winding terminal 22 as viewed from the axial direction of the lead wire 17e. As shown in FIG. 2B, the stator winding terminal 22 has a connection port 22 a to which the lead wire 17 e is connected at one end, and an insertion portion 22 b at the other end of the stator winding terminal 22. The insertion portion 22b is provided with an insertion hole 22c through which a bolt 23 made of a conductive metal is inserted. As shown in FIG. 2A, the bolt 23 is inserted through the insertion hole 22c. At this time, one of the axial end surfaces of the insertion portion 22b of the stator winding terminal 22 is brought into contact with the axial end surface of the head portion 23c of the bolt 23 opposed thereto.

  The bolt 23 is inserted into a through hole 13d formed in the rear bracket 13 and extends to the outside in order to be connected to a connection terminal 24 from an inverter (not shown). At this time, in order to insulate the bolt 23 and the rear bracket 13, an insulating member 25 made of resin is attached to the rear bracket 13, and the bolt 23 is inserted into the insulating member 25. An insertion hole 25a that is an insertion portion is formed. In order to hold the bolt 23 inserted through the insertion hole 25a, a holding member 26 having a non-circular sectional shape in the radial direction and made of a conductive metal is fixed to the insulating member 25 by insert molding. ing.

  FIG. 2C is a perspective view of the holding member 26. As shown in FIG. 2C, the holding member 26 is provided with a press-fit portion 26a into which the bolt 23 is press-fitted, and the bolt 23 is a press-fit hole formed in the press-fit portion 26a. It is press-fitted into 26b. The holding member 26 is provided with a holding member fixing portion 26c for fixing the holding member 26 to the rear bracket 13. The holding member fixing portion 26c includes the holding member 26 and the rear bracket. A holding member fixing hole 26d through which a screw for mounting on the screw 13 is inserted is formed. FIG. 2D is a side view of the bolt 23. As shown in FIG. 2D, the bolt 23 is provided with a press-fit portion 23a to be press-fitted into the press-fit hole 26b of the holding member 26, and a knurl 23b is formed on the outer peripheral surface of the press-fit portion 23a. Is provided. This prevents the bolt 23 press-fitted into the press-fitted hole 26b of the holding member 26 from dropping from the holding member 22 (hereinafter, this operation is referred to as “disengagement”).

  Subsequently, the nut 27 made of a conductive metal is screwed to the male screw portion 23 d of the bolt 23 via the washer 28 on the end surface of the holding member 26 in the axial direction opposite to the bolt head. As a result, the nut 27 is electrically connected through the head 23 c of the bolt 23, the stator winding terminal 22, the holding member 26, and the washer 28.

  Further, the connection terminal 24 is inserted into the bolt 23, and the bolt head side axial end surface of the connection terminal 24 is brought into contact with the anti-bolt head side axial end surface of the nut 27. Subsequently, a second nut 29 having a washer is screwed onto the male screw portion 23 d of the bolt 23 and is crimped to the other end of the connection terminal 24 on the side opposite to the bolt head side in the axial direction. In order to insulate the nut 27 screwed onto the bolt 23 and the rear bracket 13, a terminal cover 30 made of resin is attached to the outer side in the radial direction of the nut 27. The nut 27 is fitted and positioned in a fitting portion 27 a provided on the nut 27.

  FIG. 3 is a front view of the insulating member 25 provided in the three-phase AC rotating electric machine 1. The lead wire 17e shown in FIG. 3 is shown in a radial cross-sectional view. As shown in FIG. 3, the three holding members 26 are fixed to the insulating member 25 by insert molding in order to cope with the three-phase alternating current, and are pressed into the press-fit holes 26 b of the holding member 26. The insertion hole 25a through which the bolt 23 is inserted, and a first fixing hole through which a screw inserted into the holding member fixing hole 26d of the holding member 26 is inserted in order to fix the holding member 26 to the rear bracket 13. 25b is drilled. Further, a second fixing hole 25c through which a screw for attaching the insulating member 25 to the rear bracket 13 is inserted is formed.

  A ventilation passage 31 corresponding to each of the bolts 23 is recessed in the axial end surface of the insulating member 25, and the cooling fan 11 is provided on one of the axial end surfaces of the rotor 2. The generated cooling air is guided to the bolt 23, the bolt 23, the stator winding terminal 22 through which the bolt 23 is inserted, and the lead connected to the connection port 22 a of the stator winding terminal 22. Line 17e is cooled.

  FIG. 4 is a diagram showing a part of the components constituting the terminal structure of the three-phase AC rotating electric machine 1. In FIG. 4, FIG. 4A is a front view of the insulating member 25 attached to the rear bracket 13. FIG. 4B is a cross-sectional view taken along line AA in FIG. FIG.4 (c) is the BB sectional drawing of Fig.4 (a). As shown in FIG. 4A, a first fixing screw 32 is inserted into the first fixing hole 25b of the insulating member 25, and a second fixing screw 33 is inserted into the second fixing hole 25c of the insulating member 25. Is inserted. As shown in FIG. 4B, the first fixing screw 32 is inserted through the first fixing hole 25b of the insulating member 25 and fixed to the insulating member 25 by insert molding. After being inserted into the holding member fixing hole 26d, it extends to the outside of the insulating member 25 and is screwed to the first female screw portion 13e formed in the rear bracket 13. Further, as shown in FIG. 4C, the second fixing screw 33 is inserted into the second fixing hole 25c of the insulating member 25 and then extended to the outside of the insulating member 25, so that the rear bracket 13 is screwed into a second female threaded portion 13f drilled in 13. Thus, the holding member 26 and the insulating member 25 to which the holding member 26 is fixed are attached to the rear bracket 13.

  According to said structure, since it has the structure where the said volt | bolt 23 is press-fit in the said holding member 26 fixed to the said insertion hole 25a of the said insulating member 25 instead of the said positive electrode side heat sink (not shown), Heat from the positive-side heat sink (not shown) is not transmitted, so that the insulating member 25 is prevented from melting.

  Further, the nut 27 is screwed into the male screw portion 23d of the bolt 23, and the tightening force applied to the bolt 23 is press-fitted into the press-fit hole 26b formed in the press-fit portion 26a. Even if the bolt 23 is normally crimped in the assembly process of the three-phase AC rotating electric machine 1 by setting it to be larger than the pressure input at the time, the bolt is tightened by the fastening force of the nut 27. 23 is more securely crimped, and even if the bolt 23 is not normally press-fitted into the press-fit hole 26b because the press-fitting load of the bolt 23 is insufficient, the nut 27 is screwed. The bolt 23 is further crimped to a normal state.

  In this way, the stator winding terminal 22 and the bolt 23 are pressure-bonded, whereby the head portion 23c of the bolt 23 and the bolt head side axial end surface of the stator winding terminal 22 opposed thereto, An anti-bolt head side axial end surface of the stator winding terminal 22, a bolt head side axial end surface of the holding member 26, and an anti-bolt head side axial end surface of the holding member 26 via the washer 28. Since the bolt head side axial end surface of the nut 27 is in surface contact, the contact area is enlarged, the contact resistance when energizing the contact portion is reduced, and the temperature of the bolt 23 and the nut 27 is reduced. As a result, the insulation member 25 is prevented from being dissolved.

  Further, when the rotor 2 provided with the cooling fan 11 is rotated, cooling air is caused to flow through the ventilation path 31 as indicated by broken-line arrows described in FIG. 1, FIG. 3 or FIG. 4. As a result, the temperature rise of the lead wire 17e, the stator winding terminal 22 and the bolt 23 is further suppressed, and accordingly the temperature rise of the nut 27 is also suppressed, and the insulation member 25 is more reliably melted. To be prevented.

  Further, since the knurling 23b is provided on the outer peripheral surface of the press-fitting portion 23a of the bolt 23, the fixing torque of the bolt 23 can be increased, and when the nut 27 is screwed, the holding The operation in which the bolts 23 press-fitted into the press-fitting hole 26b of the member 26 rotate together (hereinafter, this operation is referred to as “rotation”) is prevented.

  The same effect can be obtained by providing a knurling (not shown) not on the outer peripheral surface of the press-fit portion 23a but on the inner peripheral surface of the press-fit hole 26b formed in the press-fit portion 26a. Needless to say.

  Further, the holding member 26 is firmly fixed to the insulating member 25 by insert molding, and the radial cross-sectional shape of the holding member 26 is formed in a noncircular shape. When being screwed to 23, rotation of the holding member 26 is prevented. Therefore, by the rotation of the holding member 26, the holding member 26 into which the bolt 23 is press-fitted is dropped from the insulating member 25, and the biting of the rotor 2 caused thereby is prevented.

Embodiment 2
FIG. 5 is a diagram showing a terminal structure of the three-phase AC rotating electric machine 1 according to Embodiment 2 of the present invention. Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG. 5, FIG. 5A is an enlarged partial axial sectional view of a main part of the three-phase AC rotating electric machine 1. As shown in FIG. 5A, the holding member 34 made of conductive metal is fixed to the insulating member 25 by insert molding, and the bolt 35 made of conductive metal is attached to the insulating member 25. It is inserted through the insertion hole 25a.

  FIG. 5B is a perspective view of the holding member 34 into which the bolt 35 is press-fitted. As shown in FIG. 5B, the press-fit portion 34a of the holding member 34 extends in the axial direction, and extends outside the rear bracket 13 as shown in FIG. 5A. . Further, as shown in FIG. 5B, the holding member 34 is provided with a holding member fixing portion 34c for fixing the holding member 34 to the rear bracket 13, and the holding member fixing portion 34c includes a holding member fixing portion 34c. A holding member fixing hole 34d through which the first fixing screw 32 is inserted is formed. As shown in FIG. 5A, the bolt 35 is press-fitted into a press-fit hole 34b formed in the press-fit part 34a.

  FIG. 5C is a side view of the bolt 35. As shown in FIG. 5C, the bolt 35 is provided with a press-fit portion 35a to be press-fitted into the press-fit hole 34b of the holding member 34, and a knurl 35b is formed on a part of the outer peripheral surface of the press-fit portion 35a. Is provided. As a result, the bolt 35 press-fitted into the press-fit hole 34b is prevented from coming off.

  As shown in FIG. 5A, the connection terminal 24 is inserted into the bolt 35 press-fitted into the press-fit hole 34b, and is brought into contact with the axial end surface of the holding member 34 on the side opposite to the bolt head side. . Subsequently, a nut 36 having a washer is screwed onto the male screw portion 35 d of the bolt 35 and is crimped to the connection terminal 24. Thereby, the head 35c of the bolt 35, the stator winding terminal 22, the holding member 34, and the connection terminal 24 are electrically connected.

  FIG.5 (d) is CC sectional view taken on the line of FIG.5 (c). As shown in FIG. 5 (d), the radial cross-sectional shape of the press-fit portion 35a is formed in a hexagonal shape, and accordingly, as shown in FIG. 5 (b), the radial direction of the press-fit hole 34b. The cross-sectional shape is also formed in a hexagonal shape. Thereby, when the nut 36 is screwed onto the bolt 35, the rotation of the bolt 35 press-fitted into the press-fit hole 34b is prevented.

  Further, in order to insulate the holding member 34 extended to the outside of the rear bracket 13 and the rear bracket 13, the terminal cover 30 is mounted radially outward of the holding member 34. 30 is fitted and positioned in a fitting portion 34e provided in the holding member 34.

  According to the above configuration, the head portion 35c of the bolt 35 and the bolt head side axial end surface of the stator winding terminal 22 opposed thereto, and the anti-bolt side axial end surface of the stator winding terminal 22 The bolt head side axial end surface of the holding member 34, the anti-bolt head side axial end surface of the holding member 34, and the bolt head side axial end surface of the connection terminal 24 are in surface contact, so the contact area is expanded. As a result, the contact resistance is reduced, the temperature rise of the bolt 35 and the holding member 34 is suppressed, and the melting of the insulating member 25 is prevented accordingly. Furthermore, by extending the press-fit portion 34a constituting the holding member 34 outward in the axial direction, the connection terminal 24 can be crimped to the holding member 34 without increasing the number of parts.

  Further, the nut 36 is screwed by providing the radial cross-sectional shape of the press-fit portion 35a of the bolt 35 and the radial cross-sectional shape of the press-fit hole 34b formed in the holding member 34 in a hexagonal shape. In doing so, the rotation of the bolt 35 press-fitted into the press-fit hole 34b is prevented. In the second embodiment of the present invention, the case where the radial direction cross-sectional shape of the press-fit portion 35a is hexagonal has been described. However, by providing this shape in a non-circular shape other than the hexagonal shape, It goes without saying that the effect of can be obtained.

Embodiment 3
FIG. 6 is a diagram showing a terminal structure of the three-phase AC rotating electric machine 1 according to Embodiment 3 of the present invention. Hereinafter, the same parts as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 6, FIG. 6A is an enlarged partial sectional view of a main part of the three-phase AC rotating electric machine 1. As shown in FIG. 6A, the holding member 26 is fixed to the insertion hole 25a formed in the insulating member 25 by insert molding, and the bolt 37 made of conductive metal is attached to the holding member 26. The member 26 is press-fitted into the press-fitted hole 26b. Subsequently, a metal member 38 made of a conductive metal is inserted into the bolt 37 in a loosely fitted state and is brought into contact with the axial end surface of the holding member 26 on the side opposite to the bolt head.

  FIG. 6B is a perspective view of the metal member 38. As shown in FIG. 6B, the metal member 38 is formed in a tubular shape. FIG. 6C is a side view of the bolt 37. As shown in FIG. 6C, the bolt 37 is provided with a press-fit portion 37b that is press-fitted into the press-fit hole 26b of the holding member 26, and a knurled portion 37b is provided on the outer peripheral surface of the press-fit portion 37a. It has been. This prevents the bolt 37 that has been press-fitted into the press-fitted hole 26b from coming off.

  As shown in FIG. 6A, the connection terminal 24 is inserted into the bolt 37 press-fitted into the press-fitted hole 26b, and is brought into contact with the axial end surface of the metal member 38 on the side opposite to the bolt head side. . Subsequently, the nut 36 is screwed onto the male screw portion 37 d of the bolt 37 and is crimped to the connection terminal 24. Accordingly, the head portion 37c of the bolt 37, the stator winding terminal 22, the holding member 26, the metal member 38, and the connection terminal 24 are electrically connected.

  In order to insulate the metal member 38 extending from the rear bracket 13 and the rear bracket 13, the terminal cover 30 is mounted on the outer side in the radial direction of the metal member 38. 30 is fitted and positioned in a fitting portion 38a provided on the metal member 38.

  According to the above configuration, the head 37c of the bolt 37 and the bolt head side axial end surface of the stator winding terminal facing the head 37c, and the anti-bolt head side axial end surface of the stator winding terminal 22 Bolt head side axial end surface of the holding member 26, anti-bolt head side axial end surface of the holding member 26, bolt head side axial end surface of the metal member 38, and anti-bolt head of the metal member 38 Since the side axial direction end surface and the bolt head side axial end surface of the connection terminal 24 are in surface contact, the contact area is enlarged and the contact resistance is reduced, and the temperature of the bolt 37 and the metal member 38 is reduced. The rise is suppressed, and accordingly, the melting of the insulating member 25 is prevented. Furthermore, since the connection terminal 24 is crimped to the bolt 37 via the metal member 38, the shape of the holding member 26 does not have to be changed according to the change in the position where the connection terminal 24 is crimped. Good.

Embodiment 4
FIG. 7 is a diagram showing some of the components that constitute the terminal structure of the three-phase AC rotating electric machine 1 according to Embodiment 4 of the present invention. Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG. 7, FIG. 7A is a perspective view of a holding member provided in the three-phase AC rotating electric machine 1. As shown in FIG. 7A, the holding member 39 made of a conductive metal is provided with a press-fit portion 39a into which a bolt 40 made of a conductive metal is press-fitted. It press-fits into the press-fit hole 39b drilled in the press-fit part 39a. The holding member 39 is provided with a holding member fixing portion 39c for fixing the holding member 39 to the rear bracket 13. The first fixing screw 32 is inserted into the holding member fixing portion 39c. A holding member fixing hole 39d is formed. A holding member side keyway 39e is recessed in the inner peripheral surface of the press-fitted hole 39b.

  FIG. 7B is a side view of the bolt 40. The holding member 39 shown in FIG. 7B is shown in an axial sectional view. As shown in FIG. 7B, the bolt 40 to be press-fitted into the holding member 39 is provided with a press-fitting portion 40a to be press-fitted into the press-fitted hole 39b of the holding member 39. A knurl 40b is provided on the outer peripheral surface, and a bolt-side keyway 40e is further recessed. A head 40c is provided at one end of the bolt 40 in the axial direction, and a male screw portion 40d to which the nut 27 is screwed is provided at the other end.

  FIG.7 (c) is the DD sectional view taken on the line of FIG.7 (b). As shown in FIG. 7C, the bolt 40 is press-fitted into the press-fit hole 39b so that the holding member-side key groove 39e and the bolt-side key groove 40e face each other. Subsequently, as shown in FIG. 3D, the key 41 made of a conductive metal is inserted into both the key grooves facing each other.

  According to the above configuration, the fixing torque of the bolt 40 press-fitted into the press-fitted hole 39b can be further increased, and when the nut 27 is screwed to the male screw portion 40d of the bolt 40, The rotation of the bolt 40 is prevented. Further, since the key 41 is made of a conductive metal, the key 41 can be used as a current-carrying path and electric resistance can be suppressed.

Embodiment 5
FIG. 8 is a diagram showing some of the components that constitute the terminal structure of the three-phase AC rotating electric machine 1 according to Embodiment 5 of the present invention. Hereinafter, the same parts as those in the first embodiment or the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted. 8A is a side view of a bolt provided in the three-phase AC rotating electric machine 1. The holding member 39 shown in FIG. 8A is shown in an axial sectional view. As shown in FIG. 8A, the bolt 42 made of a conductive metal is provided with a press-fit portion 42a that is press-fitted into the press-fit hole 39b of the holding member 39, and the outer peripheral surface of the press-fit portion 42a. Is provided with a knurl 42b and a key 42f made of a conductive metal. Further, a head portion 42c is provided at one end of the bolt 42 in the axial direction, and a male screw portion 42d to which the nut 27 is screwed is provided at the other end.

  FIG.8 (b) is the EE sectional view taken on the line of Fig.8 (a). As shown in FIG. 8B, when the bolt 42 is press-fitted into the press-fit hole 39b of the holding member 39, the key 42f of the bolt 42 is inserted into the holding member-side key groove 39e. Thus, it press-fits into the said press-fit hole 39b.

  According to said structure, the effect similar to Embodiment 4 is acquired, and also the said bolt 42 reduces the number of parts by one, and also makes the said key 42f convexly provided in this bolt 42 the said holding member side. What is necessary is just to press-fit into the said press-fitting hole 39b so that it may penetrate the key groove 39e, Therefore, the assembly of the said three-phase alternating current rotating electrical machine 1 becomes easy.

  In the fifth embodiment, as shown in FIG. 8B, the key 42f is projected on the outer peripheral surface of the press-fitting portion 42a of the bolt 42, and the press-fitting hole 39b of the holding member 39 is further provided. The case where the holding member side keyway 39e is recessed in the inner peripheral surface has been described. However, a key (not shown) is protruded from the inner peripheral surface of the press-fitting hole 39b of the holding member 39. Furthermore, it goes without saying that the same effect can be obtained even when a bolt-side key groove (not shown) is recessed in the outer peripheral surface of the press-fit portion 42a of the bolt 42.

Embodiment 6
FIG. 9 is a diagram showing some of the components that constitute the terminal structure of the three-phase AC rotating electric machine 1 according to Embodiment 6 of the present invention. Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG. 9, FIG. 9A is a front view of an insulating member provided in the three-phase AC rotating electric machine 1. The lead wire 17e shown in FIG. 9A is shown in a radial cross-sectional view. As shown in FIG. 9A, the three holding members 26 are fixed to the insulating member 43 by insert molding in order to cope with the three-phase alternating current, and are press-fitted into the press-fit holes 26b of the holding member 26. An insertion hole 43a through which a bolt 44 made of a conductive metal is inserted, and a first fixing hole 43b through which the first fixing screw 32 for fixing the holding member 26 to the rear bracket 13 is inserted. It has been drilled. Further, a second fixing hole 43c through which the second fixing screw 33 for attaching the insulating member 43 to the rear bracket 13 is inserted.

  FIG. 9B is a side view of the bolt 44. As shown in FIG. 9B, the bolt 44 is provided with a press-fit portion 44a that is press-fitted into the press-fit hole 26b of the holding member 26, and a knurl 44b is provided on the outer peripheral surface of the press-fit portion 44a. It has been. Thereby, the bolt 44 press-fitted into the holding member 26 is prevented from coming off. Furthermore, a head 44c is provided at one end of the bolt 44 in the axial direction, and a male screw portion 44d to which the nut 27 is screwed is provided at the other end.

  FIG.9 (c) is the FF sectional view taken on the line of FIG.9 (b). As shown in FIG.9 (c), the radial cross-sectional shape of the head 44c of the said bolt 44 is formed in the hexagonal shape. Accordingly, in order to surround the head portion 44c of the bolt 44 inserted through the insertion hole 43a, the insulating member 43 is provided with a head surrounding portion 43d whose radial cross-sectional shape is formed in a hexagonal shape. ing.

  According to the above configuration, the head portion 44c of the bolt 44 and the radial cross-sectional shape of the head surrounding portion 43d surrounding the head portion 44c are provided in a hexagonal shape. Since the head portion 44c is locked to the head surrounding portion 43d, when the nut 27 is screwed to the male screw portion 44d of the bolt 44, the rotation of the bolt 44 is prevented. In the sixth embodiment of the present invention, the case where the radial cross-sectional shapes of the head portion 44c and the head surrounding portion 43d are hexagonal has been described. However, the non-circular shape other than the hexagonal shape is provided. It goes without saying that the same effect can be obtained.

  In the first to sixth embodiments of the present invention, the case where the present invention is applied to a motor generator has been described. For example, another AC rotating electric machine such as an alternator in which a rectifier is provided is provided. Of course, it is possible to apply the present invention.

1 is an axial cross-sectional view of a three-phase AC rotating electric machine that is a motor generator having a motor function and a generator function according to Embodiment 1 of the present invention. It is a figure which shows the terminal structure of the said three-phase alternating current rotary electric machine. It is a front view of the insulating member provided in the said three-phase alternating current rotary electric machine. It is a figure which shows a part of component which comprises the terminal structure of the said three-phase alternating current rotating electrical machine. It is a figure which shows the terminal structure of the three-phase alternating current rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows the terminal structure of the three-phase alternating current rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows a part of component which comprises the terminal structure of the three-phase alternating current rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure which shows a part of component which comprises the terminal structure of the three-phase alternating current rotary electric machine which concerns on Embodiment 5 of this invention. It is a figure which shows a part of component which comprises the terminal structure of the three-phase alternating current rotary electric machine which concerns on Embodiment 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Three-phase alternating current rotary electric machine, 2 Rotor, 3 Shaft, 4 1st magnetic pole iron core, 4a 1st boss | hub part, 4b 1st insertion hole, 4c 1st yoke part, 4d 1st claw-shaped magnetic pole part, 5 2nd Magnetic core, 5a second boss, 5b second insertion hole, 5c second yoke, 5d second claw-shaped magnetic pole, 6 bobbin, 7 field winding, 8 wire, 9 slip ring, 10 brush, 11 Cooling fan, 12 Cooling fan, 13 Rear bracket, 13a Mounting hole, 13b Air intake hole, 13c Exhaust hole, 13d Through hole, 13e First female screw part, 13f Second female screw part, 14 Front bracket, 14a Mounting hole, 14b Air intake hole 14c exhaust hole, 15 rear bearing, 16 front bearing, 17 stator, 17a stator core, 17b shoulder, 17 c shoulder portion, 17d stator winding, 17e lead wire, 18 through bolt, 19 pulley, 20 nut, 21 resolver, 22 stator winding terminal, 22a connection port, 22b insertion portion, 22c insertion hole, 23 bolt, 23a Press-fit part, 23b Knurl, 23c Head, 23d Male thread part, 24 Connection terminal, 25 Insulating member, 25a Insertion hole, 25b First fixing hole, 25c Second fixing hole, 26 Holding member, 26a Press-fit part, 26b Press-fit Hole, 26c holding member fixing portion, 26d holding member fixing hole, 27 nut, 27a fitting portion, 28 washer, 29 second nut, 30 terminal cover, 31 ventilation path, 32 first fixing screw, 33 second fixing screw.

Claims (12)

A rotor provided on the shaft;
A bracket that rotatably supports the shaft, and a stator that is fixed to the bracket and that faces the rotor via a minute radial gap;
A stator winding terminal provided at one end of a multiphase stator winding wound around the stator, a bolt made of a conductive metal inserted into the stator winding terminal, and
An insulating member mounted on the bracket and provided with an insertion portion through which the bolt is inserted;
A holding member fixed to the insertion portion of the insulating member and provided with a press-fit portion into which the bolt is press-fitted, and
A nut made of a conductive metal screwed to the bolt,
The stator winding terminal and the bolt interposed between the bolt head and the nut are screwed onto the bolt press-fitted into the pressed-in portion of the holding member. A multi-phase AC rotating electrical machine characterized by being electrically connected. The multiphase AC rotating electric machine according to claim 1, wherein the holding member is made of a conductive metal. The multi-phase AC rotating electric machine according to claim 2, wherein a connection terminal from an external device is inserted into the bolt and is crimped to an axial end surface of the holding member. A metal member made of a conductive metal is inserted into the bolt and is crimped to the axial end surface of the holding member on the side opposite to the bolt head side, and a connection terminal from an external device is inserted into the bolt to be opposite to the metal member. The multiphase AC rotating electric machine according to claim 2, wherein the multiphase AC rotating electric machine is crimped to the holding member side axial end face. The multiphase AC rotation according to any one of claims 2 to 4, wherein a knurling is provided on at least one of an outer peripheral surface of the press-fitting portion of the bolt and an inner peripheral surface of the press-fitted portion. Electric. Key grooves are recessed in both the outer peripheral surface of the press-fit portion of the bolt and the inner peripheral surface of the press-fit portion, and the bolt is press-fitted into the press-fit portion so that both the key grooves face each other, The multiphase AC rotating electric machine according to any one of claims 1 to 5, wherein a key is inserted into both the key grooves facing each other. A key is provided on either the outer peripheral surface of the press-fit portion of the bolt or the inner peripheral surface of the press-fit portion, and the key is fitted when the bolt is press-fitted into the press-fit portion. 6. The multiphase AC rotating electric machine according to claim 1, wherein a groove is recessed in the other of the outer peripheral surface of the press-fit portion of the bolt or the inner peripheral surface of the press-fit portion. The radial cross-sectional shape of the press-fitting portion of the bolt and the radial cross-sectional shape of the press-fitted portion into which the bolt is press-fitted are formed in a non-circular shape. A multi-phase AC rotating electrical machine according to claim 1. 6. The head surrounding portion surrounding the head of the bolt and the head perforated in the insulating member is formed in a non-circular shape. The multiphase AC rotating electrical machine described in 1. The multiphase AC rotating electric machine according to any one of claims 1 to 9, wherein the holding member has a non-circular cross-sectional shape in a radial direction. The tightening force acting on the bolt by screwing the nut is set to be larger than the pressure input when the bolt is press-fitted into the press-fit portion. The multiphase AC rotating electric machine according to any one of 10. The cooling fan is provided in both the axial direction end surfaces of the said rotor, The ventilation path which guides the cooling air which generate | occur | produces with this cooling fan is recessedly provided in the said insulating member, The Claims 1 thru | or Claim Item 12. The multiphase AC rotating electric machine according to any one of Items 11.

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