JP7318514B2 - Rotating electric machine - Google Patents

Description

The present invention relates to rotating electric machines.

As a conventional rotary electric machine, for example, a motor described in Patent Document 1 is known. The motor disclosed in Patent Literature 1 includes a rotor and a stator arranged outside the rotor. The stator includes a housing, a stator core fixed inside the housing, and a coil wound around the stator core. A terminal unit is attached to one end of the stator core. The terminal unit is provided with a plurality of coil power supply terminals that are connected to terminal portions of the coil. An insulating cover is arranged on the outer peripheral portion of the terminal unit to cover the connecting portion between the terminal portion of the coil and the coil power supply terminal. The insulating cover ensures insulation between the vicinity of the connecting portion and the housing.

JP 2008-125308 A

However, the above conventional technology has the following problems. That is, a heat-shrinkable synthetic resin tube is used as the insulating cover. Therefore, in order to thermally shrink the insulating cover, a heating process for the insulating cover is required. Further, if the adhesion between the insulating cover and the connecting portion is strong after the insulating cover is thermally shrunk, it becomes difficult to bend the end portion of the coil in a post-process. On the other hand, if the adhesion between the insulating cover and the connection portion is weak after the insulating cover has been thermally shrunk, the insulating cover may come off when the end portion of the coil is bent in a post-process.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating electric machine that can secure a wide range of insulation properties while eliminating the need for a heating process for a member that insulates the ends of coils from a housing.

One aspect of the present invention provides a rotating electrical machine including a stator core, a housing that accommodates at least a portion of the stator core, and a coil wound around the stator core, wherein a coil feed terminal connected to an end portion of the coil; A terminal block to which a power supply terminal is attached, and an insulating tube attached to the terminal portion to electrically insulate the terminal portion from the housing. and a protruding portion protruding from the groove to the outside in a direction perpendicular to the insertion direction of the terminal portion with respect to the cylindrical portion.

In such a rotary electric machine, when attaching the coil power supply terminal connected to the terminal portion of the coil to the terminal block, first, the insulating tube is attached to the terminal portion of the coil. At this time, the end portion of the coil is inserted into the tubular portion so that the groove portion and the protruding portion are located closer to the housing than the tubular portion. Then, the terminal portion of the coil is bent, and the coil feeding terminal is fixed to the terminal block. When the coil power supply terminal is attached to the terminal block, the insulating tube electrically insulates the end portion of the coil from the housing. By using the insulating tube as the member for insulating the end portion of the coil and the housing, the heating process for the member for insulating the end portion of the coil and the housing becomes unnecessary. Further, in the insulating tube, the protruding portion protrudes from the groove portion to the outside in a direction perpendicular to the insertion direction of the end portion of the coil with respect to the tubular portion. Therefore, the insulating range of the insulating tube is widened outward in the direction perpendicular to the insertion direction of the terminal portion of the coil with respect to the cylindrical portion. As a result, a wide range of insulation is ensured by the insulating tube.

The tubular portion is provided on one end side of the insulating tube and positioned on the coil power supply terminal side, and the groove and the projecting portion are provided on the other end side of the insulating tube and positioned on the housing side. may be With such a configuration, a wide range of insulation from the housing is ensured while simplifying the structure of the insulating tube.

The protruding portion may protrude from the groove portion to both outer sides in a direction perpendicular to the insertion direction of the terminal portion with respect to the cylindrical portion. With such a configuration, the insulating range of the insulating tube is widened on both outer sides of the cylindrical portion in the direction perpendicular to the insertion direction of the terminal portion of the coil. Therefore, insulation from the housing is ensured on both outer sides of the tubular portion in the direction perpendicular to the insertion direction of the terminal portion of the coil.

The tubular portion may be fixed to the coil power supply terminal with an adhesive tape. With such a configuration, the insulating tube is reliably prevented from being detached from the end portion of the coil, so that the insulating tube sufficiently ensures insulation over a wide range.

The number of terminal portions and coil feeding terminals is three, the three terminal portions are attached to the terminal block in a state of being arranged in a direction perpendicular to the axial direction of the stator core, and the insulating tube is attached to the three terminal portions. The protruding portion is arranged between the two terminal portions on the outer side of the cylindrical portion from the groove portion in the direction perpendicular to the insertion direction of the terminal portion. You may protrude to the terminal part which carried out. In such a configuration, even if an insulating tube is not attached to the end portion of the coil located in the middle of the three coil end portions, the overhanging portions of the insulating tubes attached to the two end portions located at both ends can , the insulation between the terminal portion of the coil located in the middle and the housing is ensured. Therefore, the number of insulating tubes to be used and the man-hours for manufacturing the rotating electric machine are reduced.

ADVANTAGE OF THE INVENTION According to this invention, wide range insulation can be ensured, without the heating process of the member which insulates the terminal part of a coil, and a housing.

1 is a perspective view showing a rotating electrical machine according to one embodiment of the present invention; FIG. 2 is a perspective view of the insulating tube shown in FIG. 1; FIG. 3 is a perspective view showing a technique for forming the insulating tube shown in FIG. 2; FIG. FIG. 4 is a front view showing a state in which insulating tubes are attached to coil end portions in a manufacturing process of a rotating electric machine; FIG. 10 is a front view showing a state in which the cylindrical portion of the insulating tube is fixed to the coil power supply terminal with an adhesive tape in the manufacturing process of the rotating electric machine; It is a schematic diagram showing a state of fixing the tubular portion to the coil power supply terminal with an adhesive tape. FIG. 4 is a perspective view showing a state in which a coil power supply terminal is attached to a terminal block in a manufacturing process of a rotating electric machine;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a rotating electric machine according to one embodiment of the present invention. In FIG. 1, a rotary electric machine 1 of the present embodiment is used as a cargo handling motor for rotationally driving a cargo handling hydraulic pump of a forklift, for example. The cargo handling motor is a three-phase AC motor here. The rotary electric machine 1 can also be used as a traveling motor that rotates the wheels of a forklift.

The rotary electric machine 1 includes a rotor 2, a stator core 3 arranged outside the rotor 2, a housing 4 housing one end portion of the stator core 3, and a housing 5 housing the other end portion of the stator core 3. I have.

The rotor 2 is integrated with a rotating shaft (not shown). The housings 4 and 5 are made of a conductive metal material. As a metal material forming the housings 4 and 5, for example, stainless steel or the like is used. The housings 4 and 5 are fastened together by a plurality of sets of bolts 6 and nuts 7 .

A three-phase coil 8 (see FIGS. 4 and 5) is wound around the stator core 3 . The three-phase coils 8 are a U-phase coil, a V-phase coil and a W-phase coil. The coil 8 is an electric wire insulated with an insulating material such as enamel. Coil end portions 9A to 9C (end portions) are drawn out from the coil 8 of each phase. The coil end portions 9A to 9C are arranged at equal intervals in the width direction (Y direction) of the stator core 3 perpendicular to the axial direction (X direction) of the stator core 3. The coil terminal portion 9B is arranged between the coil terminal portions 9A and 9C.

Coil power supply terminals 10A to 10C are electrically and physically connected to the tip portions of the coil terminal portions 9A to 9C, respectively. The coil power supply terminal 10A is a U-phase coil power supply terminal. The coil power supply terminal 10B is a V-phase coil power supply terminal. A coil power supply terminal 10C is a W-phase coil power supply terminal. The coil power supply terminals 10A to 10C are terminals for supplying electric power to the coil 8. FIG. The coil end portions 9A to 9C and the coil power supply terminals 10A to 10C are connected by thermal caulking (fusing) or the like, for example.

In addition, the rotary electric machine 1 includes a terminal block 11 attached to the housing 4, and two insulating tubes 12 respectively attached to the coil terminal portions 9A and 9C positioned at both ends of the three coil terminal portions 9A to 9C. I have. The insulating tube 12 is not attached to the coil end portion 9B located in the middle of the three coil end portions 9A to 9C.

The terminal block 11 is a plate-like base made of resin having terminal electrodes (not shown) to which the coil power supply terminals 10A to 10C are respectively attached. As a resin material forming the terminal block 11, for example, a polyamide synthetic resin or the like is used. The terminal block 11 is fastened to the housing 4 with a plurality of sets of bolts 13 and nuts 14 .

The coil power supply terminals 10A to 10C are arranged in the width direction (Y direction) of the stator core 3 at equal intervals. The coil power supply terminals 10A to 10C are fastened to terminal electrodes of the terminal block 11 with bolts 15 and nuts 16, respectively.

The insulating tube 12 is a tube that electrically insulates the coil end portions 9A to 9C and the housing 4 from each other. The insulating tube 12 has a cylindrical shape. The insulating tube 12 is made of an electrically insulating material. Examples of such an insulating material include a silicon glass tube and the like.

As shown in FIG. 2, the insulating tube 12 includes a tubular portion 17 into which the coil end portions 9A and 9C are inserted, a groove portion 18 continuously arranged in the tubular portion 17, and a tubular portion extending from the groove portion 18. It has two protruding portions 19 that protrude outward in the radial direction of the tubular portion 17 with respect to the shaped portion 17 . The tubular portion 17 is provided on one end side of the insulating tube 12 . The groove portion 18 and the projecting portion 19 are provided on the other end side of the insulating tube 12 .

The radial direction (J direction) of the cylindrical portion 17 corresponds to the direction perpendicular to the axial direction (I direction) of the cylindrical portion 17 . Further, the axial direction of the tubular portion 17 corresponds to the insertion direction of the coil terminal portions 9A and 9C in the tubular portion 17. As shown in FIG. Therefore, the radial direction of the cylindrical portion 17 corresponds to the direction perpendicular to the insertion direction of the coil terminal portions 9A and 9C.

The cylindrical portion 17 has a cylindrical shape. The groove 18 has a semi-cylindrical shape. The groove portion 18 is placed on the coil terminal portions 9A and 9C. The protruding portions 19 protrude from the circumferential ends of the groove portion 18 to both the left and right radially outer sides of the tubular portion 17 with respect to the tubular portion 17 . At this time, the amount of protrusion of the two protrusions 19 may be equal or different. If the two protruding portions 19 have different protruding amounts, it is desirable to increase the protruding amount of the protruding portion 19 arranged on the side of the two protruding portions 19 where the range to be insulated is larger. The projecting portion 19 has a flat shape.

The insulating tube 12 described above is formed as follows. That is, as shown in FIG. 3, a generally cylindrical insulating tube 20 is prepared, and a notch 21 extending in the axial direction of the insulating tube 20 from one end of the insulating tube 20 to the central portion of the insulating tube 20 is made. At the same time, cuts 22 extending from the cuts 21 to both left and right sides in the circumferential direction of the insulating tube 20 are made. In this state, the insulating tube 20 is opened in the radial direction of the insulating tube 20 along the cut 22 with the cut 21 as a starting point. Thereby, as shown in FIG. 2, the insulating tube 12 having the cylindrical portion 17, the groove portion 18 and the two projecting portions 19 is obtained.

The insulating tube 12 is attached to the coil end portions 9A and 9C so that the cylindrical portion 17 is located on the coil power supply terminals 10A and 10C side, and the groove portion 18 and projecting portion 19 are located on the housing 4 side. At this time, the coil terminal portions 9A and 9C are inserted into the cylindrical portion 17 so that the coil terminal portions 9A and 9C are not exposed at the coil power supply terminals 10A and 10C.

One protruding portion 19 of the insulating tube 12 extends from the groove portion 18 between the coil end portions 9A to 9C and the housing 4 to the outside of the cylindrical portion 17 in the radial direction of the coil end portion 9B. It sticks out to The projecting portions 19 on one side of the insulating tube 12 overlap each other at the coil terminal portion 9B. Therefore, not only the coil end portions 9A and 9C, but also the coil end portion 9B is electrically insulated from the housing 4. FIG. As a result, the coil end portions 9A to 9C are protected by the two insulating tubes 12. As shown in FIG. The other projecting portion 19 of the insulating tube 12 is in contact with the inner wall surface of the housing 4 .

Further, the cylindrical portion 17 is fixed to the coil power supply terminals 10A and 10C with an adhesive tape 23 having electrical insulation. As the adhesive tape 23, for example, a fluororesin adhesive tape is used.

In the manufacturing process of the rotary electric machine 1 as described above, when the coil power supply terminals 10A to 10C connected to the coil end portions 9A to 9C are attached to the terminal electrodes (not shown) of the terminal block 11, first, as shown in FIG. As shown, the insulating tube 12 is attached to the coil end portions 9A and 9C positioned at both ends of the coil end portions 9A to 9C.

Specifically, the stator core 3 is placed vertically so that the coil power supply terminals 10A to 10C are positioned at the top. Then, the insulating tube 12 is inserted into the coil end portions 9A and 9C so that the coil end portions 9A and 9C are inserted into the cylindrical portion 17 while the cylindrical portion 17 is positioned above the groove portion 18 and the projecting portion 19. to be worn.

Subsequently, as shown in FIG. 5, the cylindrical portion 17 of the insulating tube 12 is adhered and fixed to the coil power supply terminals 10A and 10C with the adhesive tape 23. Next, as shown in FIG. At this time, as shown in FIG. 6, by winding the adhesive tape 23 a plurality of times around the area including the boundary between the cylindrical portion 17 and the coil feeding terminals 10A and 10C, the cylindrical portion 17 and the coil feeding terminals 10A and 10C are bonded together. and fixed.

Thereafter, as shown in FIG. 7 , the housings 4 and 5 are attached to the stator core 3 and the terminal block 11 is attached to the housing 4 . Then, after bending the coil end portions 9A to 9C toward the terminal block 11 side, bending the coil end portions 9A to 9C toward the housing 5 side, the coil power supply terminals 10A to 10C are connected to the terminal block 11 by bolts 15 and nuts 16. It is fixed to a terminal electrode (not shown).

As described above, in this embodiment, when the coil power supply terminals 10A to 10C connected to the coil terminal portions 9A to 9C are attached to the terminal block 11, the insulating tube 12 is first attached to the coil terminal portions 9A and 9C. do. At this time, the coil end portions 9A and 9C are inserted into the tubular portion 17 so that the groove portion 18 and the projecting portion 19 are located closer to the housing 4 than the tubular portion 17 is. Then, the coil terminal portions 9A to 9C are bent, and the coil feeding terminals 10A to 10C are fixed to the terminal block 11. FIG. When the coil power supply terminals 10A-10C are attached to the terminal block 11, the insulating tube 12 electrically insulates the coil end portions 9A-9C from the housing 4. FIG.

By using the insulating tube 12 as a member for insulating the coil end portions 9A to 9C and the housing 4 in this way, the heating process for the member for insulating the coil end portions 9A to 9C and the housing 4 is not necessary. Therefore, the number of man-hours for manufacturing the rotating electric machine 1 can be reduced. In addition, even after the insulating tube 12 is attached to the coil end portions 9A, 9C, the coil end portions 9A, 9C can be easily bent. Furthermore, even if the coil end portions 9A and 9C are bent, the insulating tube 12 is less likely to come off.

Also, in the insulating tube 12, the protruding portion 19 protrudes outward from the groove portion 18 with respect to the cylindrical portion 17 in the direction perpendicular to the insertion direction of the coil terminal portions 9A and 9C. Therefore, the insulating range of the insulating tube 12 widens outward in the direction perpendicular to the insertion direction of the coil end portions 9A and 9C with respect to the tubular portion 17 . As a result, a wide range of insulation is ensured by the insulating tube 12 .

Further, in this embodiment, the cylindrical portion 17 is provided on one end side of the insulating tube 12 and positioned on the side of the coil power supply terminals 10A and 10C. It is provided on the other end side and positioned on the housing 4 side. Therefore, while simplifying the structure of the insulating tube 12, a wide range of insulation from the housing 4 is ensured.

Further, in the present embodiment, the protruding portion 19 protrudes from the cylindrical portion 17 on both sides in the direction perpendicular to the insertion direction of the coil terminal portions 9A and 9C. Therefore, the insulating range of the insulating tube 12 is widened to both outer sides of the cylindrical portion 17 in the direction perpendicular to the insertion direction of the coil end portions 9A and 9C. Therefore, insulation from the housing 4 is ensured on both outer sides of the cylindrical portion 17 in the direction perpendicular to the insertion direction of the coil end portions 9A and 9C.

Further, in the present embodiment, the cylindrical portion 17 is fixed to the coil power supply terminals 10A and 10C with an adhesive tape 23. As shown in FIG. Therefore, the insulating tube 12 is reliably prevented from coming off the coil terminal portions 9A and 9C, so that the insulating tube 12 can sufficiently ensure a wide range of insulation.

Further, in the present embodiment, the projecting portion 19 is arranged between the coil terminal portions 9A and 9C outside the groove portion 18 and the cylindrical portion 17 in the direction perpendicular to the insertion direction of the coil terminal portions 9A and 9C. It extends to the coil end portion 9B. Therefore, even if the insulating tube 12 is not attached to the coil terminal portion 9B located in the middle among the coil terminal portions 9A to 9C, the insulating tube 12 attached to the coil terminal portions 9A and 9C located at both ends can be projected. The portion 19 ensures insulation between the coil terminal portion 9B and the housing 4 . Therefore, the number of insulating tubes 12 to be used and the man-hours for manufacturing the rotating electric machine 1 are reduced.

Further, in the present embodiment, the insulating tube 12 having the cylindrical portion 17, the groove portion 18, and the projecting portion 19 is in a state in which the cylindrical insulating tube 20 is provided with the axially extending notch 21 and the circumferentially extending notch 22. The insulating tube 20 is formed by opening the insulating tube 20 along the notch 22 with the notch 21 as a starting point. Therefore, the entire insulating tube 20 is effectively used, and a part of the insulating tube 20 does not have to be discarded.

In addition, this invention is not limited to the said embodiment. For example, in the above-described embodiment, in the insulating tube 12, the protruding portion 19 protrudes from the groove portion 18 to the cylindrical portion 17 on both sides in the radial direction of the cylindrical portion 17, but the configuration is not particularly limited. Alternatively, the protruding portion 19 may protrude from the groove portion 18 to only one side of the tubular portion 17 in the radial direction.

In the above embodiment, the tubular portion 17 of the insulating tube 12 is taped to the coil power supply terminals 10A and 10C. The portion 17 need not be taped to the coil feed terminals 10A and 10C.

In the above embodiment, the cylindrical portion 17 is provided on one end side of the insulating tube 12, and the groove portion 18 and projecting portion 19 are provided on the other end side of the insulating tube 12. The form is not limited. For example, depending on the structure of the rotating electric machine 1 , the cylindrical portion 17 may be provided at the central portion in the axial direction of the insulating tube 12 , and the groove portion 18 and the projecting portion 19 may be provided on both end sides of the insulating tube 12 .

Further, in the above-described embodiment, the cylindrical portion 17 has a cylindrical shape, but the shape is not particularly limited, and the cylindrical portion 17 may have a square tube shape. In this case, the groove portion 18 has, for example, a half-square shape.

Moreover, the dimensions of the insulating tube 12 may be appropriately increased as necessary. In this case, since the amount of protrusion of the protrusion 19 is increased, the insulation between the coil end portions 9A to 9C and the housing 4 can be performed more reliably.

In addition, in the above embodiment, the housings 4 and 5 both accommodate a portion of the stator core 3, but the present invention is not limited to this form. good. The point is that the housing should accommodate at least part of the stator core 3 .

In the above-described embodiment, the insulating tube 12 is attached to the U-phase coil end portion 9A and the W-phase coil end portion 9C located at both ends of the coil end portions 9A to 9C. is not limited, and the insulating tube 12 may also be attached to the V-phase coil terminal portion 9B located between the coil terminal portions 9A and 9C, if necessary.

Further, the rotary electric machine 1 of the above embodiment is used as a motor mounted on a forklift, but the present invention can also be applied to vehicles other than forklifts, or can be applied to drive systems other than vehicles. is.

Moreover, although the rotary electric machine 1 of the above embodiment is a three-phase AC motor, the present invention can also be applied to a single-phase motor. In this case, the number of coils, coil terminal portions, and coil power supply terminals is one. The present invention can also be applied to generators and the like.

DESCRIPTION OF SYMBOLS 1... Rotary electric machine 3... Stator core 4, 5... Housing 8... Coil 9A-9C... Coil terminal part (terminal part) 10A-10C... Coil feeding terminal 11... Terminal block 12... Insulating tube 17 ... Cylindrical part, 18 ... Groove part, 19 ... Overhanging part, 23 ... Adhesive tape.

Claims (3)

A rotating electric machine comprising a stator core, a first housing accommodating one end portion of the stator core, a second housing accommodating the other end portion of the stator core, and three coils wound around the stator core,
three terminal portions respectively drawn out to the three coils ;
three coil feeding terminals respectively connected to the three terminal portions;
a terminal block attached to the first housing and having the three coil power supply terminals arranged in a direction perpendicular to the axial direction of the stator core ;
Two insulating tubes respectively attached to two first terminal portions located at both ends of the three terminal portions and electrically insulating the three terminal portions and the first housing,
The insulating tube includes a tubular portion into which the first terminal portion is inserted, a groove portion continuously arranged in the tubular portion, and an arrangement direction of the coil power supply terminals from the groove portion to the tubular portion. and a projecting portion projecting to the second terminal portion disposed between the two first terminal portions on the outside of the
The cylindrical portion is provided on one end side of the insulating tube and positioned on the coil power supply terminal side,
The rotary electric machine , wherein the groove and the projecting portion are provided on the other end side of the insulating tube and positioned on the first housing side. 2. The electric rotating machine according to claim 1 , wherein the protruding portion protrudes from the groove portion to both outer sides of the cylindrical portion in the arrangement direction of the coil power supply terminals . 3. The electric rotating machine according to claim 1 , wherein said cylindrical portion is fixed to said coil power supply terminal with an adhesive tape .

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