JP5153167B2 - Winding connection device for rotating machine - Google Patents

Description

  The present invention includes a connection member that is externally connected to a stator winding that can be wound around a stator core of a stator, and a holding member that holds the connection member provided on one side in the axial direction of the stator core. The present invention relates to a winding connecting device for a rotating machine.

Conventionally, such a winding connection device for a rotating machine is provided with a winding connection terminal 10 as shown in Japanese Patent Application Laid-Open No. 2004-64954. This application is shown in FIG.
The winding connection terminal 10 shown in FIG. 5 is provided with a slit portion in which the tip end portion of the winding connection terminal 10 is vertically divided, and the tip ends of both pieces of the winding connection terminal 10 sandwiching the slit portion are tapered. Yes. In FIG. 5, the end of the stator winding 20 wound around the stator core is inserted into the slit portion that is a vertical division of the tip of the winding connection terminal 10, and then as shown in FIG. 6 after welding. The winding connection terminal 10 and the end of the stator winding 20 are welded and fixed by TIG welding or the like. In addition, the figure before welding of FIG. 6 is the figure which looked at the winding connection terminal 10 of FIG. 5 from the top.

JP 2004-64954 A

  However, as shown in FIG. 6, when the stator winding 20 is inserted and welded into the slit portion formed by dividing the tip of the winding connection terminal 10 as shown in FIG. Since the tips of both ends of the winding connection terminal 10 have a tapered shape, there is a difference in the way in which welding heat is transferred, such as TIG welding, and uniform welding cannot be achieved. As shown in the figure after welding in FIG. 6, the end portions of the two ends of the winding connection terminal 10 are not sufficiently welded at the ends of the stator winding 20 that must be securely connected and fixed. It burns down quickly, resulting in variations in the finish of the weld. As a result, the tensile strength of the welded portion becomes insufficient, and poor conduction due to poor welding also occurs.

  In view of this, the present invention has an optimum shape so that the welding of the winding connection terminal of the winding connection device for a rotating machine can be satisfactorily performed, and the winding connection terminal has an optimum shape, thereby enabling the winding for the rotating machine. The wire connecting device is miniaturized.

The present invention provides a rotating member including a connecting member that is externally connected to a stator winding wound around a stator core of a stator, and a holding member that holds a connecting member provided on one side in the axial direction of the stator core. In the winding connection device for a machine, the connection member is provided with a winding connection terminal that accommodates the end of the stator winding, and the winding connection terminal extends from the body portion and the body portion of the winding connection terminal. This is a winding connection terminal provided with a U-shaped groove that can accommodate a stator winding between corners of a book. In addition, the winding connection terminal is configured such that the width of the outer both ends of the winding connection terminal of the portion provided with the U-shaped groove is wider than the terminal width of the main body,
The U-shaped groove of the winding connection terminal accommodates the stator winding, melts and welds two corners extending from the main body of the winding connection terminal,
When the total area of the two corners extending from the main body housing the stator winding is T and the cross-sectional area of the stator winding is S, 1 ≦ (T / S) ≦ 3 is satisfied. The winding connection device for a rotating machine is provided with a winding connection terminal.

  Further, the total width of the two corner portions extending from the main body portion of the winding connection terminal is wider than the diameter of the stator winding, thereby enabling more stable welding.

  Furthermore, the surface of the winding connection terminal can be easily welded by tin plating.

  According to the present invention, in the winding connection device for a rotating machine, including the holding member that holds the connection member that is connected to the end of the stator winding wound around the stator core, the connection member includes the stator winding. Winding connection terminals are provided to house the ends of the windings, and the stator windings are housed and wound in a U-shaped groove composed of a main body portion of the winding connection terminals and two corner portions extending from the main body portion. The welding cross-sectional area that melts and welds the two corners extending from the main body of the wire connection terminal can be made to have an optimal welding shape, so that the welding heat can be transmitted uniformly when welding. A stable weld tensile strength with good finish and little variation can be obtained. In addition, since the welded portion can be reliably connected, the contact resistance is small, and conduction failure and the like can be reduced. Further, since the shape of the winding connection terminal is optimum, the size can be reduced.

In addition, by making the total width of the two corners extending from the main body of the winding connection terminal from the diameter of the stator winding wider than the diameter of the stator winding, good and stable welding is possible. Become.
Further, the surface of the winding connection terminal can be further easily welded by tin plating.

  In addition, by using such a winding connection device for a rotating machine as an electric motor provided on one side in the axial direction of the stator core for use in a vehicle, the electric motor can be reduced in size, and contact resistance is reduced, and conduction failure is reduced. The motor can be improved in quality.

  The present invention will be described with reference to the drawings. FIG. 1 shows that the end of the stator winding 2a is pulled out from the stator core obtained by winding the stator winding 2a around the stator core of the stator, and is welded or soldered to external connection members 40U, 40V, 40W, 40Xa, 40Xb. It is the coil | winding connection apparatus 50 for rotary machines connected by the above. The connecting members 40U, 40V, 40W, 40Xa, and 40Xb of the winding connecting device 50 for a rotating machine shown in FIG. 1 are held by a highly insulating holding member 60 and attached to one of the stators in the axial direction. Examples of the material of the holding member 60 include polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and liquid crystal polymer (LCP).

  An electric motor using a stator provided with such a winding connection device 50 for a rotating machine in one axial direction of the stator core is often applied to a stator using a thick winding through which a large current flows. In particular, it is used for electric power steering mounted on automobiles. The stator winding 2a is an electric motor of a concentrated winding method in which the stator winding 2a is wound directly after resin insulation is performed using a split core on the stator core.

  The winding connection device 50 for a rotating machine shown in FIG. 1 is a three-phase motor in which 10 slots are formed with 12 slots and 2Y connection is made. The stator winding 2a constitutes a U phase, a V phase, and a W phase, and one end of the stator winding 2a constituting the U phase is connected to connection members 40Xa and 40Xb that form a neutral point, The other is connected to the connecting member 40U connected to the stator winding 2a on the outside. Similarly, one end of the stator winding 2a constituting the V-phase is connected to connection members 40Xa and 40Xb that form a neutral point, and the other end is connected to the connection member 40V that is externally connected to the stator winding 2a. Connecting. In the W phase, one end of the stator winding 2a is connected to connection members 40Xa and 40Xb that form a neutral point, and the other end is connected to a connection member 40W connected to the stator winding 2a on the outside. U, V, and W are terminal portions that are connected to the power supply side outside the motor.

Here, connection members 40Xa and 40Xb connected to form a neutral point at one end of the stator winding 2a of each phase, and connection members connected externally to the stator winding 2a of each phase 40U, 40V, and 40W are respectively provided with winding connection terminals 1a that house one or the other end of the stator winding 2a.
At both ends of the connecting member 40U, there are provided Ua and Ub, one at each of the winding connection terminals 1a for accommodating the ends of the U-phase stator winding 2a connected in 2Y.
At both ends of the connecting member 40V, there are provided winding connection terminals 1a for accommodating the ends of the V-phase stator winding 2a connected in 2Y, Va and Vb, one at each end.
At both ends of the connecting member 40W, winding connection terminals 1a for accommodating the ends of the W-phase stator winding 2a connected in 2Y are provided with Wa and Wb, one at each end.
Winding that accommodates the ends of the neutral stator windings 2a connected 2Y in three places, one Xab and one Xab between the two ends of one connecting member 40Xa and one Xab between the two ends. A line connection terminal 1a is provided.
Winding that accommodates the ends of the stator winding 2a at the neutral point that is 2Y-connected to a total of three locations, one Xba and one Xbb between the two ends of the other connecting member 40Xb and one Xbb between the two ends. A line connection terminal 1a is provided.

The connecting members 40U, 40V, 40W, 40Xa, and 40Xb are arranged in a three-layer substantially arc shape having different radii when viewed in a cross section perpendicular to the axial direction of the stator core while being held by the holding member. ing.
In the present embodiment, when viewed in a cross section perpendicular to the axial direction of the stator core, the outermost peripheral layer has two connection points 40Xa and 40Xb at neutral points for connecting 2Y, and a connection member 40U for connecting the U phase to 2Y. Are arranged in a substantially concentric arc shape.
A connecting member 40U for connecting the U phase in 2Y and a connecting member 40W for connecting the W phase in 2Y are arranged in a substantially concentric arc shape on the inner intermediate layer.
Further, a connecting member 40V for connecting the V phase in 2Y is disposed on the innermost peripheral layer on the inner side.

The connection member 40U is formed in a substantially concentric arc shape with the two connection members 40Xa and 40Xb in the outermost peripheral layer when viewed in a cross section perpendicular to the axial direction of the stator core, and the connection member 40U disposed in the outermost peripheral layer. The connecting member 40Ua is provided with a stepped crossover 40Ua and is formed in a substantially concentric arc shape with the connecting member 40W arranged in the intermediate layer. Thereby, each connection member 40U, 40V, 40W and 40Xa, 40Xb can be arrange | positioned at the coil | winding connection apparatus 50 for rotary machines in 3 layer structure. As a result, the radial size of the winding connecting device 50 for a rotating machine can be reduced and the size can be reduced.
Further, in the embodiment, the stepped crossover portion 40Ua of the connection member 40U is one place, but a plurality of places may be provided. In the embodiment of FIG. 1, the connection members 40Xa and 40Xb are divided into two locations, but the same effect can be obtained even when the two connection members 40Xa and 40Xb are connected.

  The winding connection terminal 1a of the winding connection device 50 for a rotating machine having a reduced radial size when viewed in a cross section perpendicular to the axial direction of the stator core in such an embodiment will be described with reference to FIG. The winding connection terminal 1a of FIG. 2 is particularly suitable when the radial connection size of the rotary machine winding connection device 50 is small and the arrangement and shape of the winding connection terminal 1a cannot be made large as in the embodiment. .

  The winding connection terminal 1a of FIG. 2 of the present embodiment is composed of a main body part c and two corner parts a and b extending from the main body part c, and two extending from the main body part c in a U shape. One end of the stator winding 2a or the other end is easily inserted between the corners a and b.

  The welding conditions in this embodiment are a welding current of 110 (A) to 90 (A), a welding time of 195 (msec) to 105 (msec), and TIG welding is used. The stator winding 2a in the present embodiment uses a thick stator winding 2a having a diameter of φ1.0 to φ2.5.

  Under these conditions, when welding is performed, the areas of the two corner portions a and b extending in a U shape from the body portion c of the winding connection terminal 1a with respect to the cross-sectional area S of the wire diameter of the stator winding 2a. The welding tensile strength of welding between the stator winding 2a and the winding terminal portion 1a varies depending on the widths of Ta and Tb. The boundary line between the main body part c and the corner parts a and b is a perpendicular line drawn perpendicularly from the position of the bottom part where the stator winding 2a is inserted into the U-shaped groove with respect to the main body part c. When the areas Ta and Tb of the two corners a and b extending in a U-shape from the main body c of the winding connection terminal 2a are small with respect to the cross-sectional area S of the wire diameter of the stator winding 2a, The welding heat is transmitted and melts and burns off.

  Conversely, the areas Ta and Tb of the two corner portions a and b extending in a U shape from the main body portion c of the winding connection terminal 1a with respect to the cross-sectional area S of the wire diameter of the stator winding 2a are as follows. If it is too large, the welding heat will not be transmitted and welding will be incomplete. Judging from such a situation, it is important to maintain a stable weld tensile strength, and in the welded portion 3a as shown in FIG.

  As shown in FIG. 4, the welding tensile strength can be maintained with respect to a peak value 55 (Kg) at which a stable maximum welding tensile strength can be obtained, and the appearance of the welded portion 3a is such that no welding protrusion is generated. Requires 44 (Kg) or more. That is, by setting the weld tensile strength to about 80% or more of the peak value of the weld tensile strength, a stable weld tensile strength can be maintained, and the welded portion 3a has a shape that does not generate weld projections or the like. be able to.

  Here, when welding is applied to the shape of the winding connection terminal 1a of the present embodiment, the winding is made with respect to the cross-sectional area S of the wire diameter of the stator winding 2a in order to obtain a welding point 3a as shown in FIG. The ratio of the total area T = Ta + Tb of the cross-sectional areas Ta and Tb of the two corners a and b extending in a U shape from the main body c of the connection terminal 1a is 1 ≦ (T / S) ≦ 3. Therefore, stable welding can be performed and a weld tensile strength of 80% or more can be maintained. Moreover, it can be set as the shape which a welding protrusion etc. do not generate | occur | produce on the external appearance of the welding location 3a.

  As can be seen from FIG. 4, when the ratio of (T / S) is 1 or less, the winding connection terminal 1a is too profitable and the strength decreases. Moreover, when the ratio of (T / S) is 3 or more, welding cannot be ensured and the welding strength is lowered. Specifically, the ratio of (T / S) is 54 (Kg) when (T / S) = 1, and 55 (Kg) and (T / S) when (T / S) = 2. ) = 3 is 48 (kg).

  Further, as shown in FIG. 2, with respect to the wire diameter R of the stator winding 2a, the minimum terminals of the two corner portions a and b extending in a U shape from the body portion c of the winding connection terminal 1a. By making the widths ra and rb wider than the wire diameter R, the two corners a and b extending in a U-shape from the main body c of the winding connection terminal 1a are not burned down by welding heat. . Since the stator winding 2a is opened first, the two corners a and b of the winding connection terminal 1a are opened and welded, so that welding can be performed reliably and the welding tensile strength can be increased. it can. Therefore, stable welding is possible by making the sum (ra + rb) of the minimum width ra and rb of the terminal width wider than the wire diameter R of the winding connection terminal 1a ((ra + rb) ≧ R).

In addition, by applying tin plating to the terminal surface of the winding connection terminal 1a, it is possible to obtain a winding connection terminal with higher meltability, lower contact resistance, excellent corrosion resistance, and improved weld strength.
In this tin plating, a copper plate plated with tin is punched to form the winding connection terminal 1a. Therefore, the cross section of the blade punched out of the copper plate is not plated with tin.

The figure of the coil | winding connection apparatus for rotary machines. The figure of the coil | winding connection terminal used for the coil | winding connection apparatus for rotary machines. The figure of the welding part shape after welding the coil | winding connection terminal of FIG. The graph which shows the relationship between welding tensile strength and the area of a terminal / winding wire diameter cross-sectional area. The figure before welding of the conventional coil connection terminal. The figure which showed the state before and behind welding of the coil | winding connection terminal shown in FIG.

Explanation of symbols

1a, 10, Ua, Ub, Va, Vb, Wa, Wb, Xaa to Xac, Xba to Xbc ... Winding connection terminals U, V, W ... Terminal portions 2a, 20 ... Winding 3a, 30 ... Welding point 40U, 40V, 40W, 40Xa, 40Xb ... Connection member 40Ua ... Stepped transition part 50 ... Winding connection device 60 for rotating machine ... Holding member S ... Winding Line cross section

Claims (3)

For a rotating machine comprising a connecting member connected externally to a stator winding wound around a stator core of a stator, and a holding member for holding the connecting member provided on one side in the axial direction of the stator core A winding connection device,
The connection member is provided with a winding connection terminal that accommodates an end of the stator winding,
The winding connection terminal is provided with a U-shaped groove that can accommodate the stator winding between a main body portion and two corner portions extending from the main body portion,
The U-shaped groove of the winding connection terminal accommodates the stator winding and melts and welds two corners extending from the main body,
Welding is performed at a welding current of 110 (A) to 90 (A) and a welding time of 195 (msec) to 105 (msec),
When the total area of the two corners extending from the main body housing the stator winding is T and the cross-sectional area of the stator winding is S, 1 ≦ (T / S) ≦ 3 is satisfied. A winding connection device for a rotating machine, wherein the winding connection terminal is formed as described above. 2. The winding connection for a rotating machine according to claim 1, wherein the total width of the two corners extending from the main body of the winding connection terminal is wider than the diameter of the stator winding. apparatus. The winding connection device for a rotary machine according to claim 1 or 2, wherein the winding connection terminal is tin-plated.

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