JP2004120905A - Motor jumper wire structure and stator structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jumper wire structure for easily improving a motor efficiency, facilitating handling, easily and completely assembling a stator, and improving productivity of the motor, and to provide a stator structure of the motor capable of providing size and weight reduction of the motor. <P>SOLUTION: This jumper wire structure 1 has a plurality of jumper wire members 2, 3 electrically connecting coils with each other attached at a stator core 12 of the motor. Arc-shaped jumper wire parts 2a, 3a and a plurality of leg parts 2b, 2c, 3b, 3c, 3d electrically connected with coils 14-1 to 14-24 are integrally provided at the respective jumper wire members. These jumper wire members are integrally constituted in a ring shape through insulation members 4, 5, and all the jumper wire parts of the jumper wire structure 1 are positioned on more end surface side of the stator core 12 than the electrical joint part between the coils and the leg parts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a crossover structure for electrically connecting coils mounted on a stator core of a motor and a stator structure using the crossover structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a crossover structure for electrically connecting coils wound on a stator core, a structure in which coils are connected to each other by using a conductor constituting the coil as a crossover is known.
[0003]
However, in this crossover structure, since the crossovers protrude beyond the coil in the axial direction of the stator core, the axial dimension of the stator increases, and as a result, the motor becomes larger and the weight increases. . In order to reduce the size and weight of the motor, a crossover wire protruding from the coil is sometimes externally pressurized and forced to the stator core side. In this case, however, the crossover wire and the coil may be damaged. As a result, the stator may be defective.
[0004]
In addition, since the coil and the crossover are made of the same conductor, there is a concern that the coil winding machine will be large-scale and the equipment cost will increase. The electric resistance becomes large, so that a sufficient current cannot be supplied to the coils, so that the magnetic field generated in each coil becomes small, so that an efficient motor cannot be obtained.
[0005]
As a solution to the problem in such a crossover structure, for example, a stator structure as shown in a perspective view in FIG. 7 has been proposed. In this stator structure, each coil member 52 wound around the stator core 51 and each crossover member 53 connecting the coil members are separate members, and each crossover member 53 is integrated with a crossover portion 54 and both ends thereof. And the two legs 55 are electrically connected to the required two coil members 52 via the clips 56, respectively, so that all of the connecting parts are more than the connecting portions. The crossover portion 54 is positioned closer to the stator core 51 (for example, see Patent Document 1).
[0006]
According to this stator structure, the coil member 52 and the crossover member 53 are separate members, and the crossover portion 54 is positioned closer to the stator core 51 than the joint portion between the two. Can be reduced, the size and weight of the motor can be reduced, and the electric resistance can be reduced by increasing the cross-sectional area of the crossover member 53. Therefore, a sufficient current can flow through the coil member 52, and the motor efficiency can be reduced. Can be increased.
[0007]
[Patent Document 1]
JP-A-5-300687 (
[0008]
FIG. 1)
[0010]
[Problems to be solved by the invention]
However, in the conventional stator structure shown in FIG. 7, since each of the crossover members 53 is structurally separated, the handling becomes troublesome. Since the two legs 55 are connected to the two coil members 52 via the clips 56 one by one, the assembling work is troublesome, the productivity of the motor is reduced, and the cost may be increased. Is done.
[0011]
In addition, since each of the crossover members 53 is connected to the coil member 52 at both legs 55, the weight of the crossover member 53 is concentrated on the connection portion with the coil member 52. For this reason, especially when the coil member 52 is easily deformed, the crossover member 53 may be unstable.
[0012]
Accordingly, a first object of the present invention, which has been made in view of the above points, is to improve the motor efficiency easily, and to easily and reliably assemble the stator with ease of handling, thereby improving the productivity of the motor. An object of the present invention is to provide a crossover structure that can reduce costs.
[0013]
Further, a second object of the present invention is to provide a motor stator structure that can reduce the size and weight of the motor by using the above crossover structure.
[0014]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a crossover structure for a motor, comprising: a plurality of crossover members for electrically connecting coils mounted on a stator core of the motor. In the structure, each of the crossover members has an arc-shaped crossover portion and a plurality of legs provided integrally with the crossover portion and electrically coupled to the coil. The crossover member is integrated into a ring via an insulating member.
[0015]
According to the first aspect of the present invention, since each of the crossover members is separate from the coil, it is possible to reduce the electric resistance of the crossover member and improve the motor efficiency, and to improve the motor efficiency. Are integrated as a structure, handling is easy, the stator can be easily and reliably assembled, and an improvement in motor productivity and a reduction in cost are brought about.
[0016]
According to a second aspect of the present invention, in the crossover structure for a motor according to the first aspect, at least the crossover portion of each of the crossover members is surface-insulated.
[0017]
According to the invention of claim 2, since at least the crossover portion of each crossover member is subjected to surface insulation treatment, the adjacent crossover members are directly overlapped with each other to reduce the thickness of the crossover structure in the stator axial direction. And this results in a smaller and lighter motor.
[0018]
According to a third aspect of the present invention, in the crossover structure for a motor according to the first or second aspect, the plurality of crossover members include a plurality of main bus bars each having two legs, and three legs. And one neutral bus bar having
[0019]
According to the third aspect of the present invention, since the crossover structure has the neutral point bus bar having three legs as the crossover member, it is possible to easily assemble the stator for the three-phase AC motor. Become.
[0020]
According to a fourth aspect of the present invention, in the crossover structure for a motor according to any one of the first to third aspects, the insulating member has two insulating rings, and the insulating member is provided between the two insulating rings. The cross-over part of each cross-over member is held.
[0021]
According to the fourth aspect of the present invention, since the crossover structure is formed by holding the respective crossover portions of the plurality of crossover members between the two insulating rings, the crossover structure can be easily manufactured. It becomes.
[0022]
The invention of a motor stator structure according to claim 5, which achieves the second object, connects the stator core, a plurality of coils mounted on the stator core, and these coils electrically. 5. The crossover structure according to any one of 4 above, wherein all of the crossover portions of the crossover structure are closer to the end face of the stator core than the electrical coupling portion between the coil and the leg. Side.
[0023]
According to the fifth aspect of the present invention, since all the crossover portions of the crossover structure are located closer to the end face of the stator core than the electrical coupling portion between the coil and the leg portion, the axial dimension of the stator is reduced, The size and weight of the motor are reduced. In addition, since the crossover structure is used, it can be easily supported on the end face of the stator. Therefore, particularly when the coil is easily deformed, by supporting the crossover structure on the end face of the stator, the stator can be easily and reliably assembled.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a crossover structure of a motor and a stator structure using the same according to the present invention will be described with reference to FIGS. 1 to 6.
[0025]
1 to 3 show an embodiment of a crossover structure of a motor according to the present invention. FIG. 1 is a perspective view of the entire structure, and FIG. 2 is a perspective view of a main bus bar as a crossover member. FIG. 3 is a perspective view of the neutral bus bar.
[0026]
The crossover structure 1 of the present embodiment is used for a three-phase eight-pole AC motor, and includes 21 main busbars 2 and one neutral busbar 3 which are crossover members, respectively. , Two insulating rings 4 and 5 which are insulating members. In FIG. 1, seven main bus bars for connecting eight U-phase coils described later in series are denoted by reference numerals 2U-1 to 2U-7, and eight V-phase coils described later are connected in series. The main busbars connected to the main busbars are denoted by reference numerals 2V-1 to 2V-7, and the seven main busbars connected in series to eight W-phase coils described below are denoted by reference numerals 2W-1 to 2W-7. Is shown.
[0027]
As shown in FIG. 2, each main bus bar 2 has an arc-shaped bridging wire 2a and two legs 2b, 2c standing on the inner peripheral sides of both ends and electrically connected to the coil. Are provided integrally, and at least the crossover wire portion 2a is subjected to insulation treatment on the surface. The interval between the legs 2b and 2c is substantially equal to the interval between two adjacent coils of the same phase.
[0028]
As shown in FIG. 3, the neutral point bus bar 3 is integrally erected on the arcuate crossover portion 3a and at both ends and the inner peripheral side of the center portion thereof, and is electrically coupled to the respective coils. It has three legs 3b, 3c, and 3d, and at least the crossover portion 3a is subjected to insulation treatment on the surface. The distance between the legs 3b, 3c, and 3d is substantially equal to the distance between each of three adjacent U, V, and W phase coils.
[0029]
The main bus bar 2 and the neutral bus bar 3 are integrated by holding the respective crossover portions 2a, 3a in a layered manner between the two insulating rings 4 and 5, thereby forming a ring-shaped crossover wire. The structure 1 is configured. In the present embodiment, the U-phase main bus bars 2U-1 to 2U-7 and the neutral bus bar 3 are adhesively fixed as a first layer on the surface of the insulating ring 4, and the V-phase The main bus bars 2V-1 to 2V-7 are bonded and fixed as a second layer, and the main bus bars 2W-1 to 2W-7 for the W phase are bonded and fixed as a third layer on the second layer. A crossover structure 1 is formed by bonding and fixing an insulating ring 5 thereon.
[0030]
As described above, according to the crossover structure 1 of the present embodiment, all the crossover members of the coil forming the three-phase eight-pole of the stator are integrated, so that the handling becomes easy and the three-phase eight-pole AC The stator of the motor can be easily and reliably assembled, the productivity of the motor can be improved, and the cost can be reduced.
[0031]
In addition, since each crossover member is separate from the coil, electric resistance can be easily reduced by appropriately setting the material and cross-sectional area of the crossover member, thereby improving motor efficiency. be able to. In addition, since the connecting members of each phase are layered and integrated in a phase unit between the two insulating rings 4 and 5, the connecting structure 1 can be easily manufactured, and the connecting structure can be easily manufactured. The thickness of the body 1 in the stator axial direction can be reduced, and the motor can be reduced in size and weight.
[0032]
4 to 6 show an embodiment of a motor stator structure according to the present invention. FIG. 4 is a perspective view of the entire structure, FIG. 5 is a partially enlarged perspective view of FIG. 4, and FIG. FIG.
[0033]
The stator structure of the present embodiment is applied to an AC motor for a three-phase eight-pole electric vehicle using the crossover structure 1 shown in FIG. 1, and a stator core 12 is held inside a stator frame 11. The stator core 12 has 24 stator teeth 13-1 to 13-24 formed at regular intervals via slots, and the stator teeth 13-1 to 13-24 have coils 14-1 to 13-24, respectively. 14-24 are wound in two layers.
[0034]
Here, for convenience of explanation, coils 14-1, 14-4, 14-7, 14-10, 14-13, 14-16, 14-19, and 14-22 are used for the U-phase, and coils 14-2, 14-5, 14-8, 14-11, 14-14, 14-17, 14-20, and 14-23 are used for the V phase, and the coils 14-3, 14-6, 14-9, 14-12, 14-15, 14-18, 14-21, and 14-24 are for the W phase.
[0035]
In the present embodiment, the crossover structure 1 shown in FIG. 1 is connected to the coils 14-1 to 14-14 such that the coil connecting legs 2b, 2c, 3b, 3c, and 3d face outward in the stator axial direction. -24, and the coil ends of the corresponding coils are electrically connected to each of the legs 2b, 2c, 3b, 3c, and 3d, so that the coils 14-1 to 14-24 are 21 pieces. The connection is made through the main bus bar 2 and one neutral bus bar 3 as shown in FIG.
[0036]
That is, eight U-phase coils are connected in series by the U-phase main bus bars 2U-1 to 2U-7, and eight V-phase coils are connected by the V-phase main bus bars 2V-1 to 2V-7. Are connected in series, eight W-phase coils are connected in series by W-phase main busbars 2W-1 to 2W-7, and U-phase coils 14-22 are further connected by a neutral point busbar 3. The remaining coil ends (O) of the V-phase coil 14-23 and the W-phase coil 14-24 are connected, and the remaining coil ends of the U-phase coil 14-1, the V-phase coil 14-2 and the W-phase coil 14-3 are connected. (I) is for power supply.
[0037]
In this manner, all of the connecting wires 2a, 3a of the main bus bar 2 and the neutral point bus bar 3 in the connecting wire structure 1 are connected to the coils 14-1 to 14-24 and the legs 2b, 2c, 3b, 3c, It is located closer to the end face of the stator core 12 than each of the electrical coupling portions with 3d. The electrical connection between each leg and the coil end is made by fastening with rivets or the like, welding by ultrasonic waves or the like.
[0038]
Thus, according to the stator structure of the present embodiment, the crossover structure 1 shown in FIG. 1 is used, and all the crossover portions 2a, 3a are connected to the coils 14-1 to 14-24 and the legs 2b. , 2c, 3b, 3c, and 3d, which are positioned closer to the end face of the stator core 12 than the respective electrical coupling portions, so that the axial dimension of the stator can be reduced. Therefore, the three-phase eight-pole AC motor for an electric vehicle can be reduced in size and weight. Further, by using the crossover structure 1 in which all the crossover members are integrated, the assembly of the stator becomes easy, the productivity of the motor can be improved, and the cost can be significantly reduced. Automation is also easily possible. Furthermore, since the so-called sub-assembly in which the coils 14-1 to 14-24 and the crossover structure 1 can be separately manufactured becomes possible, the coil winding machine can be simplified and the equipment cost can be reduced. it can.
[0039]
It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the spirit of the invention. For example, in the above-described embodiment, the crossover structure and the stator structure used for the three-phase eight-pole AC motor for the electric vehicle have been described. However, the present invention provides various types of motors using the crossovers that electrically connect the coils. The number, shape, and the like of the crossover members can be changed according to the motor to be applied. Further, in the stator structure, the crossover structure can be fixed to an end face of the stator core by bonding or the like. In this way, even when the coil is easily deformed, the stator can be easily and reliably assembled without applying unnecessary mechanical load to the coil.
[0040]
【The invention's effect】
As described above, according to the crossover structure of the motor according to the present invention, since a plurality of crossover members are integrated in a ring shape via an insulating member as a separate member from the coil, handling thereof is facilitated, The stator can be easily and reliably assembled, the productivity of the motor can be improved and the cost can be reduced, and the electric resistance can be easily reduced by appropriately setting the material and the cross-sectional area of the crossover member. Therefore, motor efficiency can be improved.
[0041]
Further, according to the stator structure of the motor according to the present invention, the above-mentioned crossover structure is used, and the crossover portions of all the crossover members are positioned closer to the end face of the stator core than the electrical coupling portion with the coil. As a result, the axial dimension of the stator can be reduced, and the motor can be reduced in size and weight.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a crossover structure of a motor according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main bus bar shown in FIG.
FIG. 3 is a perspective view of the neutral bus bar.
FIG. 4 is a perspective view showing an overall configuration of an embodiment of a motor stator structure according to the present invention.
FIG. 5 is a partially enlarged perspective view of FIG. 4;
6 is a connection diagram of coils in the stator structure shown in FIG.
FIG. 7 is a perspective view showing a conventional stator structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crossover structure 2 Main bus bar 2a Crossover part 2b, 2c Leg 2U-1 to 2U-7 U phase main bus bar 2V-1 to 2V-7 V phase main bus bar 2W-1 to 2W-7 W phase Main bus bar 3 Neutral point bus bar 3a Crossover portions 3b, 3c, 3d Legs 4, 5 Insulation ring 11 Stator frame 12 Stator cores 13-1 to 13-24 Stator teeth 14-1 to 14-24 Coil

Claims (5)

In a crossover structure for a motor having a plurality of crossover members for electrically connecting coils mounted on a stator core of the motor,
Each of the crossover members has an arc-shaped crossover portion and a plurality of legs provided integrally with the crossover portion and electrically coupled to the coil. A crossover structure for a motor, wherein the crossover structure is integrated into a ring via an insulating member. The crossover structure for a motor according to claim 1, wherein at least the crossover portion of each of the crossover members is subjected to a surface insulation treatment. 3. The method according to claim 1, wherein the plurality of crossover members include a plurality of main busbars each having two legs and one neutral busbar having three legs. 4. The crossover structure of the motor according to the above. The said insulating member has two insulating rings, The said crossover part of each said crossover member was hold | maintained between these two insulating rings, The Claim 1 characterized by the above-mentioned. The crossover structure of the motor according to the above. A crossover structure comprising a stator core, a plurality of coils mounted on the stator core, and the crossover structure according to any one of claims 1 to 4, which electrically connects the coils to each other. A stator structure for a motor, wherein all the crossover portions of the body are located closer to an end face of the stator core than an electrical connection between the coil and the leg.

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