JP2012175713A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten a frame ground wire to a housing without enlarging the physical frame.SOLUTION: A rotary electric machine 1 includes: a housing 20 to which a frame ground wire 24 is fastened; a circuit board 8 which has a terminal part 8b protruding to the exterior of the housing 20 and connects lead wires 25 connected with the terminal part 8b with a coil wire 7; and a box shaped cable clamp 21 having a fixing part 21a, which allows a cable 22 including the frame ground wire 24 and the lead wires 25 to be inserted therein and fixes the cable 22 to the housing 20, and covering a connection part 29 between the lead wires 25 and the terminal part 8b and a fastening part 30 between the frame ground wire 24 and the housing 20. The cable clamp 21 is formed so as to cover the fastening part 30 positioned on one side region Ta.

Description

  The present invention relates to a rotating electrical machine.

  In order to electrically connect the armature winding and the cable, there is known a rotating electrical machine in which a terminal portion which is a part of a circuit board is provided so as to protrude outside the frame (for example, see Patent Document 1). . In this rotating electrical machine, a plurality of lead wires drawn out from a cable are connected to the terminal portion of the circuit board from the load side. The connecting portion between the lead wire and the terminal portion is covered with a box-shaped cable clamp for fixing the cable to the rotating electrical machine. The cable clamp has a fixing portion on the load side for inserting and fixing the cable.

JP 2009-171730 A

  In a rotating electrical machine, one in which a frame ground wire is fixed to a housing is known. The frame ground wire is usually fixed by screwing via a crimp terminal.

  Here, in the rotating electrical machine having a structure in which the cable is connected to the terminal protruding outside the frame as in the above-described prior art, when the frame ground wire is fixed to the housing, the physique of the rotating electrical machine, the minimum bending of the frame ground wire Due to restrictions such as the radius and the length of the crimp terminal, the frame ground wire drawn from the cable is routed from the fixed part side of the terminal part to the anti-fixed part side in the cable clamp, and the frame ground line in the area on the anti-fixed part side A structure in which the crimp terminal of the wire is fixed to the housing is conceivable.

  However, in this case, a space for securing the crimp terminal is required between the terminal portion and the wall portion of the cable clamp on the side opposite to the fixed portion of the terminal portion, so that a gap between the terminal portion and the wall portion of the cable clamp is large. Therefore, the length of the cable clamp (specifically, the portion on the side opposite to the fixed portion from the terminal portion of the cable clamp) in the rotation axis direction becomes large. Here, the four corners of the cable clamp are fixed to the housing with screws, but because of the structure in which the terminal part of the circuit board is housed and arranged, the part on the fixed part side of the terminal part of the cable clamp is connected to the frame. The part on the side opposite to the fixed part from the part is fixed with screws to a bracket provided at the end of the frame. For this reason, when the axial length of the portion on the side opposite to the fixed portion from the terminal portion of the cable clamp is increased, it is necessary to increase the thickness (axial length) of the bracket, which causes an increase in the size of the rotating electrical machine. there were.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a rotating electrical machine capable of fixing a frame ground wire to a housing without causing an increase in size.

  In order to achieve the above object, the present invention provides a rotating electric machine in which one of a field and an armature is a rotor and the other is a stator, and a casing to which a frame ground wire is fixed, and the casing A terminal part protruding to the outside of the body, a circuit board connecting the lead wire connected to the terminal part and the armature winding, and a cable containing the frame ground line and the lead wire inserted therethrough A box-shaped cable clamp that includes a fixing portion that is fixed to the housing and covers a connection portion between the lead wire and the terminal portion and a fixing portion between the frame ground wire and the housing; The clamp is configured to cover the fixing portion located in a region on the fixed portion side of the terminal portion in the cable clamp.

  Preferably, the cable clamp is pulled out from the cable in the region on the fixed portion side, and folded back so as to be wound around the terminal portion in a region on the side opposite to the fixed portion of the terminal portion in the cable clamp. The frame ground line routed so as to return to the region on the fixed part side and the fixing part of the housing are covered.

  Preferably, the terminal portion has a constricted portion at least at one place in the wiring path of the wound frame ground line.

  Preferably, the terminal portion includes a portion of the wiring path of the frame ground line where the frame ground line is routed from a region on the fixed portion side to a region on the anti-fixed portion side, and the anti-fixed portion. The constricted portion is provided at two locations, which are routed from the region on the side to the region on the fixed portion side.

  Preferably, the cable clamp has a recess on the inside that can accommodate a tip of a crimp terminal for fixing the frame ground wire to the housing.

  According to the present invention, the frame ground wire can be fixed to the housing without causing an increase in the size of the physique.

1 is a longitudinal sectional view illustrating an overall configuration of a rotating electrical machine according to an embodiment. It is the top view which looked at the circuit board from the non-load side of the housing | casing. It is sectional drawing equivalent to the III-III cross section in FIG. It is sectional drawing equivalent to the III-III cross section in FIG. 1 in the rotary electric machine of a comparative example. It is the top view which looked at the rotation board in a comparative example from the anti-load side of a case.

  Hereinafter, an embodiment will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing the overall configuration of the rotating electrical machine of the present embodiment. FIG. 2 is a plan view of the circuit board as viewed from the opposite side of the housing. FIG. 3 is a cross-sectional view corresponding to a cross section taken along line III-III in FIG. In FIG. 1, a cable clamp, a cable, and the like provided on the outer peripheral side of the housing are illustrated not on a longitudinal section but on a side surface. Further, in FIG. 2, illustrations of an encoder, an encoder cover, a cable clamp, a cable, and the like provided on the outer peripheral side of the housing are omitted.

  1, 2, and 3, the rotating electrical machine 1 according to the present embodiment is an electric motor that includes a stator 2 and a rotor 3 that are arranged to face each other in the radial direction. The rotating electrical machine 1 includes a stator 2 and a rotor 3, a frame 4 to which a frame ground wire 24 is fixed, one axial side of the frame 4 (load side; right side in FIGS. 1 and 3, back side in FIG. 2. From the load-side bracket 11 provided on the side) and the anti-load-side bracket 13 provided on the other side in the axial direction of the frame 4 (the anti-load side, the left side in FIGS. 1 and 3, the front side in FIG. 2). And a circuit board 8 and a cable clamp 21 which is formed in a box shape and fixes and protects the cable 22 including the frame ground wire 24 and the three lead wires 25 to the housing 20. .

  The stator 2 is provided on the inner peripheral surface of the frame 4, and is molded with a resin 17 together with a main body portion 8 a (described later) of the circuit board 8. The stator 2 includes a laminated core body 5, a bobbin 6 through which the laminated core body 5 is inserted, and a coil wire 7 (armature winding) wound around the bobbin 6. In this embodiment, this stator 2 comprises the armature as described in a claim. The bobbin 6 is made of an insulating material such as a resin in order to electrically insulate the laminated iron core body 5 from the coil wire 7. A circuit board 8 is provided on the other axial side of the bobbin 6.

  The circuit board 8 integrally includes a main body portion 8a molded with the resin 17 in the housing 20 and a terminal portion 8b protruding from the resin 17 to the outside of the housing 20 (that is, in the cable clamp 21). The coil wire 7 connected to the main body portion 8a in the housing 20 and the three lead wires 25 connected to the terminal portion 8b in the cable clamp 21 are electrically connected. That is, the coil wire 7 wound around the bobbin 6 is electrically connected to the circuit (not shown) provided in the main body 8 a via the pin terminal 9. The terminal 7a at the end of winding of the coil wire 7 is wound around the pin terminal 9 and fixed by the solder H1. The three lead wires 25 drawn out from the cable 22 are electrically connected to a circuit (not shown) provided in the terminal portion 8b. In addition, the conducting wires of the three lead wires 25 are inserted through three through holes (not shown) provided in the terminal portion 8b from one side in the axial direction and fixed by solder H2. The terminal portion 8 b is configured such that the frame ground wire 24 drawn out from the cable 22 is wound around the terminal portion 8 b, and the constricted portions 18 are provided at two locations on the wiring path of the wound frame ground wire 24. (Details will be described later).

  The rotor 3 is composed of a permanent magnet, and is provided on the outer peripheral surface of the shaft 10 that is a rotating shaft. In the present embodiment, the rotor 3 constitutes the field described in the claims. The shaft 10 is rotatably supported by a load side bearing 12 in which an outer ring is fitted to the load side bracket 11 and an antiload side bearing 14 in which an outer ring is fitted to the antiload side bracket 13. An encoder 15 is provided on the other axial side of the shaft 10. The encoder 15 is covered with an encoder cover 16.

  The cable clamp 21 is provided on the peripheral wall portion 21 a, one axial direction side of the cable clamp 21, a fixing portion 21 b that passes the cable 22 through the through hole 211 and is fixed to the housing 20, and the cable clamp 21. Of the crimping terminal 26 for fixing the frame ground wire 24 to the housing 20 (in this example, the frame 4). And a recess 27 capable of accommodating the tip. Of the four corners of the cable clamp 21, two corners on the fixing part 21b side (that is, one side in the axial direction) from the terminal part 8b are fixed to the frame 4 by screws 23, and the anti-fixing part from the terminal part 8b. Two corners on the 21b side (that is, the other side in the axial direction) are fixed to the anti-load side bracket 13 with screws 23. In addition, the cable clamp 21 accommodates the terminal portion 8b therein, and also includes a connection portion 29 that is a connection portion between each lead wire 25 and the terminal portion 8b, and a fixing portion between the frame ground wire 24 and the housing 20. It is comprised so that the adhering part 30 which is may be covered.

  Here, in the present embodiment, each lead wire 25 is drawn out from the cable 22 in a region Ta on one side in the axial direction of the terminal portion 8b in the cable clamp 21 (hereinafter, referred to as “one side region Ta” as appropriate). The structure is such that it is inserted into a through hole provided in the terminal portion 8b from one side in the axial direction and connected to the terminal portion 8b.

  On the other hand, the frame ground wire 24 has a bending radius larger than the minimum bending radius, and the crimp terminal 26 and the like (including the protective vinyl portion 241) are regions Tb (hereinafter referred to as the axial direction other side of the terminal portion 8b in the cable clamp 21). As appropriate, it is called “the other side region Tb”) and is wound around the terminal portion 8b so as to be interposed between both the one side region Ta and the inside of the cable clamp 21. At this time, in the terminal portion 8b around which the frame ground line 24 is wound, the frame ground line 24 of the wiring path of the frame ground line 24 wound around the terminal portion 8b is located on the other side region from the one side region Ta. The constricted portion 18 is formed at two locations, a location routed by Tb and a location where the frame ground line 24 is routed from the other side region Tb to the one side region Ta.

  The frame ground wire 24 is pulled out from the cable 22 in the one side region Ta and is stored in the constricted portion 18 on one side (left side in FIG. 2) of the terminal portion 8b (while passing through the constricted portion 18). It is drawn from Ta to the other side region Tb, folded back so as to wrap around the terminal portion 8b in the other side region Tb, and stored in the constricted portion 18 on the other side (right side in FIG. 2) of the terminal portion 8b. It is routed so as to return to the one side region Ta from the other side region Tb (while passing through the constricted portion 18), and is fixed to the frame 4 via the crimp terminal 26 in the one side region Ta. . That is, the fixing portion 30 which is a fixing portion between the frame ground line 24 and the frame 4 routed as described above is located in the one side region Ta. The tip of the crimp terminal 26 is fixed to the frame 4 by screws 28 while being accommodated in a recess 27 that is recessed in the end surface on one axial side of the one side region Ta. As described above, the cable clamp 21 is configured to cover the fixing portion 30 located in the one side region Ta.

  3 shows the axial length of the portion on the other side in the axial direction from the terminal portion 8b of the cable clamp 21 (in other words, the gap between the terminal portion 8b on the other side in the axial direction and the wall portion 21a of the cable clamp 21). (Length in the axial direction) is denoted by L.

  Here, before describing the effects of the present embodiment described above, a comparative example for describing the effects of the present embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view corresponding to the III-III cross section in FIG. 1 in the rotating electrical machine of the comparative example. FIG. 5 is a plan view of the rotating substrate in the comparative example as viewed from the opposite side of the housing. 4 and 5 are diagrams corresponding to FIGS. 3 and 2 described above. For convenience of comparison, the same reference numerals as those of the present embodiment are used as the reference numerals of the respective parts in the comparative example.

  4 and 5, the configuration of the rotating electrical machine 1 'of the comparative example is substantially the same as the configuration of the rotating electrical machine 1 of the present embodiment, but the terminal portion 8b' of the circuit board 8 'has a constricted portion around it. There is a difference in the position of the fixing portion 30 'which is a fixing portion between the frame ground line 24 and the casing 20'. That is, in the rotating electrical machine 1 ′ of the comparative example, the cable clamp 21 ′ has the four corners, the two corners on the fixed part 21 b side (that is, one side in the axial direction) from the terminal part 8 b ′ with the screws 23. The two corners of the terminal portion 8b ′ on the side opposite to the fixing portion 21b (that is, the other side in the axial direction) are fixed to the anti-load side bracket 13 ′ by screws 23. The cable clamp 21 ′ is a fixed portion between the frame ground wire 24 and the anti-load side bracket 13 ′. The cable clamp 21 ′ has a region on the other side in the axial direction of the terminal portion 8 b ′ (hereinafter referred to as “other side as appropriate”). The fixing portion 30 ′ located in the region Tb ′ ”) is covered. In other words, the frame ground line 24 drawn out from the cable 22 is fixed to the anti-load side bracket 13 'in the other side region Tb'. This is because in the structure of the comparative example in which the terminal portion 8 b ′ does not have a constricted portion, the frame ground wire 24 is subject to the restriction of the minimum bending radius of the frame ground wire 24 and the length dimension of the crimp terminal 26 and the like. This is because it cannot be fixed in the one side region Ta. About another structure, it is substantially the same as the rotary electric machine 1 'of this embodiment.

  4 shows the axial length of the portion on the other side in the axial direction from the terminal portion 8b ′ of the cable clamp 21 ′ (in other words, the terminal portion 8b ′ on the other side in the axial direction and the wall portion of the cable clamp 21 ′. The length in the axial direction of the gap with 21a is indicated by L '.

  In the rotating electrical machine 1 'of the comparative example, the following problems may occur. That is, in the rotating electrical machine 1 ′ of the comparative example, the fixing portion 30 ′ is positioned in the other side region Tb ′, in other words, the frame ground line 24 is fixed to the anti-load side bracket 13 ′ in the other side region Tb ′. Therefore, a fixing space for the frame ground line 24 is required in the other side region Tb ′. For this reason, the clearance gap between terminal part 8b 'and the wall part 21a of cable clamp 21' in the other axial direction side becomes large, and the said length L 'becomes large. The cable clamp 21 'has four corners fixed to the housing 20' by screws 23. However, as described above, the terminal of the cable clamp 21 'is accommodated in the structure in which the terminal portion 8b' is housed. A portion on one side in the axial direction from the portion 8b 'is fixed to the frame 4 and a portion on the other side in the axial direction from the terminal portion 8b' is fixed to the anti-load side bracket 13 'by screws 23. For this reason, when the length L ′ is increased, the thickness (axial length) of the anti-load side bracket 13 ′ is increased, which may increase the size of the rotating electrical machine 1 ′.

  On the other hand, in the rotary electric machine 1 of the present embodiment, the cable clamp 21 is configured to cover the fixing portion 30 located in the one side region Ta. In other words, the frame ground line 24 drawn out from the cable 22 is fixed to the frame 4 in the one side area Ta. By adopting such a structure, the space for fixing the frame ground line 24 to the other side region Tb becomes unnecessary. Therefore, compared to the case of fixing the frame ground line 24 in the other side region Tb ′ as in the comparative example, The gap between the terminal portion 8b on the other side in the axial direction and the wall portion 21b of the cable clamp 21 can be reduced, and the length L can be reduced (the length L is smaller than the length L ′).

  The cable clamp 21 has four corners fixed to the housing 20 with screws. However, as described above, the cable clamp 21 is axially arranged in the axial direction from the terminal portion 8b of the cable clamp 21 because of the structure in which the terminal portion 8b is housed and arranged. One portion is fixed to the frame 4 and the other axial portion from the terminal portion 8b is fixed to the anti-load side bracket 13 with screws. For this reason, since the length L can be reduced, the thickness (axial length) of the anti-load side bracket 13 can be reduced (the thickness of the anti-load side bracket 13 is the anti-load side bracket 13 'of the comparative example). Less than the thickness of). Therefore, the rotating electrical machine 1 that can fix the frame ground wire 24 to the housing 20 without increasing the size of the physique can be realized.

  In the present embodiment, the following effects can be obtained. That is, in the one side region Ta, the frame ground wire 24 and the lead wire 25 are drawn from the cable 22 fixed by the fixing portion 21a. Here, in general, the frame ground wire 24 is fixed by screwing via the crimp terminal 26, but the frame ground wire 24 drawn out from the cable 22 is immediately fixed in the one side region Ta without being routed around the terminal portion 8b. In this case, the length of the frame ground wire 24 is restricted by the minimum bending radius and the length of the crimp terminal 26 provided at the tip, and the axial length of the portion of the cable clamp 21 on one side in the axial direction from the terminal portion 8b. Becomes larger.

  In the present embodiment, the frame ground line 24 drawn out from the cable 22 is routed from the one side region Ta to the other side region Tb, and is folded back so as to be wound around the terminal portion 8b in the other side region Tb. In this structure, the wire is routed back to the one side region Ta from the other side region Tb and fixed to the frame 4 in the one side region Ta. Thus, the length of the frame ground line 24 is absorbed by interposing the crimp terminal 26 and the like in both of the other side region Tb and the one side region Ta while being routed so that the bending radius of the frame ground line 24 is larger than the minimum bending radius. Therefore, it is possible to prevent the axial length of the portion on the one axial side from the terminal portion 8b of the cable clamp 21 from increasing. On the other hand, since it is sufficient to secure only the wiring space of the frame ground line 24 in the other side region Tb, the axial length of the portion on the other side in the axial direction from the terminal portion 8b of the cable clamp 21, that is, the length L is It will never grow. Therefore, since the length of the cable clamp 21 in the axial direction can be reliably reduced, the rotating electrical machine 1 that can fix the frame ground wire 24 to the housing 20 can be reliably realized without increasing the size of the physique.

  In the present embodiment, in particular, the terminal portion 8b includes a portion of the wiring path of the wound frame ground line 24 where the frame ground line 24 is routed from the one side region Ta to the other side region Tb, and the other side. The constricted portion 18 is provided at two locations, that is, the location routed from the side region Tb to the one side region Ta. Thereby, since the frame ground line 24 can be accommodated in the constricted portion 18 at two places, the wiring space of the frame ground line 24 wound around the terminal portion 8b can be reduced. Therefore, the size of the cable clamp 21 can be reduced.

  In the present embodiment, in particular, the cable clamp 21 has a concave portion 27 that can accommodate the tip of the crimp terminal 26 for fixing the frame ground wire 24 to the frame 4. Since the recess 27 accommodates the tip of the crimp terminal 26, the length dimension of the crimp terminal 26 can be absorbed, so that the size of the outside of the cable clamp 21 can be further reduced.

  The embodiment is not limited to the above contents, and various modifications can be made without departing from the spirit and technical idea of the embodiment. For example, in the above-described embodiment, the case where the terminal portion 8b of the circuit board 8 has the constricted portions 18 at two places in the wiring path of the frame ground line 24 wound around the terminal portion 8b is described as an example. The present invention can also be applied to a case where the terminal portion of the circuit board 8 has a constricted portion only at one place in the wiring path of the frame ground line 24 wound around the terminal portion (for example, only the constricted portion 18 on the right side in FIG. 2).

  Moreover, in the said embodiment, although the case where the circuit board 8 was provided in the anti-load side of the stator 2, ie, between the stator 2 and the anti-load side bracket 13, was demonstrated as an example, it is not restricted to this, A circuit The present invention can also be applied to the case where the substrate 8 is provided on the load side of the stator 2, that is, between the stator 2 and the load side bracket 11.

  Furthermore, in the above-described embodiment, the rotary electric machine 1 in which the rotor 3 is a field and the stator 2 is an armature has been described as an example. However, the present invention is not limited thereto, and conversely, the rotor is an armature and the stator is a field. The present invention can also be applied to a rotating electric machine that is a magnet.

  Furthermore, although the case where the rotary electric machine 1 was an electric motor was described as an example in the above embodiment, the present invention is not limited to this, and the present invention can also be applied to the case where the rotary electric machine 1 is a generator.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the above-mentioned embodiment and each modification are implemented with various modifications within a range not departing from the gist thereof.

1 Rotating electrical machine 2 Stator (armature)
3 Rotor (field)
7 Coil wire (armature winding)
8 Circuit board 8b Terminal portion 18 Constricted portion 20 Housing 21 Cable clamp 21a Fixing portion 22 Cable 24 Frame ground wire 25 Lead wire 26 Crimp terminal 27 Recess 29 Connection portion 30 Adhering portion Ta One side region (of terminal portion in cable clamp Area on the fixed part side)
Tb other side area (area on the side opposite to the fixed part of the terminal part in the cable clamp)

Claims (5)

A rotating electric machine in which one of a field and an armature is a rotor and the other is a stator,
A housing to which the frame ground wire is fixed;
A circuit board having a terminal portion protruding to the outside of the housing, and connecting the lead wire connected to the terminal portion and the armature winding;
A fixing portion for inserting the frame ground wire and a cable containing the lead wire and fixing the cable to the housing; a connection portion between the lead wire and the terminal portion; and the frame ground wire and the housing. A box-shaped cable clamp covering the fixing part,
The cable clamp is
A rotating electrical machine configured to cover the fixing portion located in a region on the fixed portion side of the terminal portion in the cable clamp. The cable clamp is
It is pulled out from the cable in the region on the fixed part side, folded back so as to be wound around the terminal part in the region on the side opposite to the fixed part of the terminal part in the cable clamp, and then into the region on the fixed part side. 2. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is configured to cover the fixing portion between the frame ground line and the housing that are routed back. The terminal portion is
The rotating electrical machine according to claim 2, further comprising a constricted portion at least at one position of a wiring path of the wound frame ground line. The terminal portion is
Of the wiring path of the frame ground line, the frame ground line is routed from the region on the fixed part side to the region on the anti-fixed part side, and the region on the fixed part side from the region on the anti-fixed part side The rotating electrical machine according to claim 3, wherein the constricted portion is provided at two locations that are routed to the region. The cable clamp is
5. The rotating electrical machine according to claim 1, further comprising a concave portion that can accommodate a tip end of a crimp terminal for fixing the frame ground wire to the housing.

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