JPH09247881A - Stator of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a motor stator wherein emergencies relative to both stresses applied to its coils in its coil connection works and abnormal heat generations of its coil connecting portions associated with the deficiencies of their current capacities are eliminated. SOLUTION: In a stator of a motor, its connection terminals for connecting its respective phase coils 3-1-3-6 therewith in the form of a predetermined configuration are made of copper or a copper alloy and comprise both an annular common terminal 9 with such a sectional area that the current density thereof becomes 8A/mm2 correspondingly to its input current and a plurality of band- shaped terminals in each of which a screw hole for connecting its external leading member therewith and a curved portion are formed respectively in the intermediate and central portions thereof correspondingly to each paired phase coils of its respective phase coils 3-1-3-6. Also, in the stator of the motor, the annular common terminal 9 and a plurality of band-shaped terminals are laminated on each other via respective insulation members in its axial direction or are disposed in the same plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a coil connecting portion of a stator of an electric motor having a polyphase winding.

[0002]

2. Description of the Related Art The contents and structure of the prior art will be described with reference to FIG. FIG. 14 shows an example in which a wiring board for connection is adopted in order to improve the work of connecting the stator terminal portion, etc., and it contributes to the solution of problems in the lead wire string binding method that has been widely used in the past. are doing. For example, many proposals for improvement such as JP-A-4-140054 can be seen. The known example is a stator core 2
The flexible wiring board 10 is used as a connecting member for pulling out the coil wound on the outside, and details are omitted. However, since the flexible wiring board easily fits in the coil end shape and is excellent in handleability, the fixing method should be devised. By taking measures such as stiffening, the handling of external leads has been improved.

[0003]

However, in the conventional structure as described above, since the current-carrying portion of the flexible wiring board is formed by thin film printing, the current-carrying portion is vulnerable to stress during electrical work and the cross-sectional area of the current-carrying portion is small. Since it is small, there is a limit to the input current of the motor, and there is a problem that it is not suitable for a motor with a large input current that supports high output, although it is actually being used for a small capacity small motor. Was there.

[0004]

In a stator of an electric motor according to the present invention, a connecting conductor and a terminal for connecting / forming coils of respective phases in a predetermined arrangement are made of copper or a copper alloy, and the input of the electric motor. It is formed of a strip-shaped member having a cross-sectional area whose current density is 8 A / mm2 or less corresponding to the current, and corresponds to the coil for each phase, and has a screw hole for fixing the external connection member in its middle part and its central part. Is composed of a plurality of band-shaped conductors each having a curved portion and a ring-shaped common conductor, and the band-shaped conductor and the ring-shaped common conductor are axially stacked or arranged on the same plane via insulating members. It

[0005]

[Operation] In the above-mentioned configuration, since the electrical connection work is performed via the highly rigid connecting conductor and terminal,
It is possible to realize a motor stator in which there is no fear of stress on the coil and there is no fear of abnormal heat generation due to insufficient current capacity of the connecting portion.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a stator 1 as an example of a three-phase winding having six coils, in which a coil 3 is wound around a stator core 2 and a winding end 3-0 of the coil 3 is connected in a predetermined configuration. It is connected to the terminals of the terminal block 4 on which the connecting conductor and the terminals are attached and which are integrated. The configurations of the stator core 2 and the coil 3 are no different from those of the conventional example.

2 to 5 show a first embodiment of a connecting conductor and a terminal installed in the terminal block 4, and FIGS. 2, 3 and 4 show parts for connecting each phase by connecting three phase coils. Each of the annular conductors and the terminals 6, 7 and 8 has a curved portion in the central portion that escapes so that a rotor shaft (not shown) can be inserted in a mounted state, and a screw hole 5 for fixing an external connecting member. 5 is provided.
Is a ring-shaped common conductor and a terminal 9 which commonly short-circuit and connect one end of each phase coil. The partial annular conductor and the terminal shown in FIGS. 2, 3, 4, and 5 and the annular conductor and the terminal are integrally formed of a flat conductor.

FIG. 6 is a front view showing a state in which the connection conductors and terminals are stacked in a mounted state, and in this example, they are stacked and arranged in the axial direction. That is, three partial annular conductors and terminals 6, 7,
Terminals 8 are arranged at a pitch of 60 degrees corresponding to each phase coil, and they are laminated together with an annular common conductor and terminal 9 shown in FIG. 5 through an insulating member to form a structure as shown in FIG. It

When the coils 1 to 6 are connected between the terminal 9.1 of the annular common conductor 9 and the terminals 6-1 to 8-2 of the partial annular conductors 6, 7 and 8, respectively, as shown in FIG. As shown, a three-phase winding is formed by connecting two coils in parallel and connecting them in a star shape. Further, power sources U, V and W are connected to the external connection member fixing screw holes 5 provided in the partial annular conductors 6, 7 and 8.

FIG. 7 shows an example in which the annular common conductor and terminal 9 and the partial annular conductors and terminals 6, 7 and 8 are arranged concentrically in the radial direction and arranged on the same plane. Although they are not shown individually for easy understanding, a small clearance is formed in the terminal portion so that each terminal portion and each arcuate conductor portion do not come into contact with each other. FIG. 8 is a development view showing coil connections in a three-phase configuration.

Usually, copper or copper alloy is suitable for the annular common conductor and terminal and the partial annular conductor and terminal, and the cross-sectional area thereof has a current density corresponding to the input current of the motor of 8 A /
It is desirable to select it so that it is less than mm2.

FIG. 9 shows a structure in which the annular common conductor and terminal 9 shown in FIG. 6 and the partial annular conductor and terminals 6, 7 and 8 are axially stacked and arranged, and the connection terminals are housed in a predetermined arrangement. 10 to 13 are front views of the base 4, and the connection terminals 6 are shown in FIGS.
FIG. 10 is a view of the grooves into which the to 9 are fitted as seen from the outside of each circumference. In FIG. 9, grooves 4-5 and 4-4 for fitting the annular common conductor 9 and the terminal 9.1 are provided at the deepest position d4 as shown in FIG. 13, and the partial annular conductor 6 and the terminal 6- 1,
As shown in FIG. 12, the groove 4-3 for fitting the terminal 6-2 is provided at the next deepest position d3, and the grooves 4-2, 4-1 for fitting the partial annular conductors 7, 8 and the terminals are formed. The conductors are provided at depths d2 and d3 so that the conductors are axially separated from each other. And the grooves 4-1 to 4 provided in the terminal block 4
As shown in FIG. 6, the annular common conductor and the terminal 9 and the partial annular conductor and the terminals 6, 7 and 8 are fitted to the groove 5, and the groove is fixed by a known means for filling the resin or the like. Although details are omitted, the terminal block of the example of the same surface arrangement shown in FIG. 7 has the same configuration except that the arrangement and shape of the grooves are different.

As described above, when the electric motor has a double shaft structure, the strip-shaped terminals each have a curved portion formed at the center thereof,
It is also effective to form a screw hole in each intermediate portion in order to provide a benefit of connection with the external drawing member.

[0014]

In the structure of the connection terminal according to the present invention as described above, since the rigidity of each connection conductor and the terminal can be made sufficiently high, there is no concern that stress is applied to the coil during the connection work, and the plate-shaped member is used as the material. Since the respective cross-sectional areas can be made sufficiently large by selecting the thickness of each of them, the fear of heat generation due to the increase of the current density of the connection portion can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a stator showing an example of the present invention.

FIG. 2 is a perspective view showing an example of a first partial annular conductor and a terminal of the example of FIG.

3 is a perspective view showing an example of a second partial annular conductor and a terminal of the example of FIG. 1. FIG.

FIG. 4 is a perspective view showing an example of a third partial conductor and a terminal of the example of FIG.

5 is a perspective view showing an example of a common annular conductor and a terminal of the example of FIG. 1. FIG.

FIG. 6 is a front view showing a stacked state of each terminal in FIGS.

FIG. 7 is a front view of an example of the same plane arrangement according to the second embodiment.

FIG. 8 is a development view showing connection of coils in a three-phase configuration.

FIG. 9 is a front view of the terminal block in the first embodiment shown in FIG.

10 is a partial view taken along the arrow A in FIG. 9, showing a groove for mounting the first strip-shaped terminal.

FIG. 11 is a partial view taken along the arrow B of FIG. 9 and shows a groove for mounting the second strip-shaped terminal.

FIG. 12 is a partial view taken along the arrow C in FIG. 9 and shows a groove in which a third strip-shaped terminal is mounted.

FIG. 13 is a partial view taken in the direction of an arrow D in FIG. 9 and shows a groove for mounting the annular common terminal.

FIG. 14 is a perspective view showing a configuration of a stator according to a conventional technique.

[Explanation of symbols]

 1 Stator 2 Stator core 3 Coil 3-1 to 3-6 Coil single unit 3-0 Coil terminal 4 Terminal block 4-1 to 4-5 Grooves provided in the terminal block 5 External connection member fixing screw hole 6 First part Annular conductor and terminal 7 Second partial annular conductor and terminal 8 Third partial annular conductor and terminal 9 Annular common conductor and terminal 10 Flexible wiring board

Claims (7)

[Claims] 1. A stator core having a plurality of radially projecting salient poles, a coil wound around the salient poles via an insulating member, and the coils being connected so as to form at least two or more phases. In a stator of an electric motor having a connecting conductor, the connecting conductor includes an annular common conductor to which one end of a coil for each phase is commonly connected, and a plurality of partial annular conductors for connecting the coils for each phase. Each of the connection conductors is formed in a flat plate shape together with the connection terminal with the coil, and the connection terminals of the connection conductors are stacked and arranged in the axial direction via insulating members so that the connection terminals are arranged at predetermined positions. The stator of the electric motor characterized by being. 2. A stator core having a plurality of radially projecting salient poles, a coil wound around the salient poles via an insulating member, and the coils are connected so as to form at least two or more phases. In a stator of an electric motor having a connecting conductor, the connecting conductor includes an annular common conductor to which one end of a coil for each phase is commonly connected, and a plurality of partial annular conductors for connecting the coils for each phase. Each of the connection conductors is composed of a concentric band-shaped conductor and a connection terminal formed in a direction perpendicular to the band-shaped conductor, and the connection terminal of the connection conductor is arranged at a predetermined position. A stator for an electric motor, characterized in that the stators are laminated in a radial direction with insulating members interposed therebetween. 3. The stator of an electric motor according to claim 1, wherein the annular common conductor, the partial annular conductor, and the connection terminal are formed of a plate-shaped member made of copper or a copper alloy. . 4. The ring-shaped common conductor, the partial ring-shaped conductor, and the connection terminal have a cross-sectional area corresponding to an input current of the motor and having a current density of 8 A / mm 2 or less. The stator of the electric motor according to item 3. 5. The stator for an electric motor according to claim 1, wherein the partial annular conductor has an external connection member fixing screw hole formed in an intermediate portion thereof. 6. The stator for an electric motor according to claim 1, wherein the partial annular conductor has a curved portion formed in a central portion thereof. 7. The ring-shaped common conductor and the partial ring-shaped conductor are mounted and arranged on a terminal block formed with a recess for fitting the common conductor and the partial ring conductor in respective predetermined positions. The stator of the electric motor described in.