JP2019092248A - Stator for rotary electric machine - Google Patents

Abstract

To provide a stator for a rotary electric machine which easily improves position accuracy of a terminal of a power line.SOLUTION: A stator 1 comprises a stator coil 25 including coils 22U, 22V and 22W of three phases that are wound around teeth 24 of a stator core 21. Lead wires 32U, 32V and 32W including acute angle inclination parts 37U, 37V and 37W which are inclined at an acute angle in a Z direction so as to move outsides in an R direction towards an end side are provided in one-side ends of the coils 22U, 22V and 22W, and the acute angle inclination parts 37U, 37V and 37W include coating parts 38U, 38V and 38W in which a conductor strand is coated with an insulation coating, and strand exposure part 39U, 39V and 39W disposed closer to the ends than the coating parts. The stator 1 also comprises power lines 42U, 42V and 42W having one-side ends 52U, 52V and 52W electrically connected to the strand exposure parts 39U, 39V and 39W of the coils 22U, 22V and 22W and the other-side ends at which terminals 62U, 62V and 62W are provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator of a rotating electrical machine.

  Conventionally, as a stator of a rotary electric machine, there is one described in Patent Document 1. The stator comprises a stator core and a stator coil. The stator core has an annular yoke, and a plurality of teeth projecting radially inward from the yoke while being spaced apart from each other in the circumferential direction of the yoke, and the stator coil is wound around the plurality of teeth. Have a coil of At one end of each coil, a lead-out including a radially extending portion and an axially extending portion is provided. The radially extending portion extends radially inward from radially inward and radially outward. The axially extending portion is connected to the radially outer end of the radially extending portion and extends in the axial direction of the stator core. The axially extending portion has a coated portion in which a conductor strand is coated with an insulating coating, and a strand exposed portion provided on the tip side of the coated portion and exposing the conductor strand. One end of the power line is electrically connected to the exposed wire portion, and the other end of the power line is provided with a terminal for electrically connecting an external electric circuit.

JP, 2016-36203, A

  The film portion of the axially extending portion is connected to the wire exposed portion via a radially extending annular step portion, and the outer diameter is larger than the outer diameter of the wire exposed portion. Therefore, since the coating portion protrudes radially outward relative to the wire exposed portion, the coating in which one end portion of the power wire electrically connected to the wire exposed portion protrudes radially outward It is easy to interfere with the part and to receive the force from the coated part. Therefore, one end of the power line is easily inclined by the force from the coating portion, and it is difficult to position the terminal provided at the other end of the power line with high accuracy.

  Then, the objective of this invention is providing the stator of the rotary electric machine which is easy to make the position accuracy of the terminal of a power wire high.

  In order to solve the above problems, a stator of a rotary electric machine according to the present invention includes: an annular yoke; and a stator core including a plurality of teeth projecting radially inward from the yoke while being spaced apart from each other in the circumferential direction of the yoke. And a stator coil wound around the plurality of teeth and including a plurality of phase coils, wherein one end of each coil is moved radially outward as it goes to the end side As described above, a lead wire including an acute angled inclined portion which is acutely inclined with respect to the axial direction of the stator core is provided, and the acute angled inclined portion includes a coated portion in which a conductor wire is coated with an insulating coating and a coated portion thereof. A motive power provided with a wire exposed portion disposed on the end side to expose the conductor wire, one end of the wire exposed portion of each coil electrically connected to one end, and a terminal provided at the other end Further comprises a line

  According to the stator of the rotating electrical machine according to the present invention, the lead wire of the coil has an acute angled inclined portion which is acutely inclined with respect to the axial direction so that the lead wire of the coil moves radially outward toward the end. The inclined portion includes a coated portion in which a conductor strand is coated with an insulating coating, and a strand exposed portion provided on the end side of the coated portion to expose the conductor strand. Therefore, since the wire exposed portion moves outward in the radial direction toward the end, the end side of the wire exposed portion is more likely to protrude radially outward than the coated portion. Therefore, it becomes difficult for one end of the power line electrically connected to the exposed part of the wire to interfere with the film part of the acute angle inclined part, and one end of the power line is precisely applied to the exposed part of the wire regardless of the film part It can be joined. As a result, the assemblability of the power line is improved, and the terminal on the other end side of the power line can be positioned with high accuracy. Furthermore, the stress generated in the weld due to the force the power line receives from the coating when correcting the power line to the correct position can be reduced, and the welding quality can also be improved.

It is a partial perspective view of the stator of the rotary electric machine which concerns on one Embodiment of this invention. It is a schematic diagram around a junction part of the leader line of U phase of the above-mentioned stator, and the power wire of U phase. It is a schematic diagram corresponding to FIG. 2 in the stator of conventional structure.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. In addition, when several embodiment, a modification, etc. are included below, it is assumed from the beginning to combine those feature parts suitably, and to construct new embodiment. In the following drawings and description of the embodiment, the R direction indicates the radial direction of the stator 1 of the rotating electrical machine, the θ direction indicates the circumferential direction of the stator 1, and the Z direction indicates the height direction of the stator 1 ( Axis direction). The R direction, the θ direction, and the Z direction are orthogonal to one another.

  FIG. 1 is a partial perspective view of a stator 1 of a rotary electric machine according to an embodiment of the present invention. In addition, in FIG. 1, although illustration of the structure of stator core 21 and coil 22U, 22V, 22W is partially omitted regarding (theta) direction, the structure of the remaining part which abbreviate | omits illustration is a part which is showing and showing. It is the same composition.

  Stator 1 is electrically connected to stator core 21 and stator coil 25 including three-phase coils 22U, 22V, 22W wound around stator core 21, and three-phase coils 22U, 22V, 22W, respectively. Power lines 42U, 42V, 42W, and a power line fastening member 44 for mechanically fastening the three-phase power lines 42U, 42V, 42W together. The stator core 21 is an annular magnetic body component, and is formed, for example, by laminating a plurality of silicon steel plates (electromagnetic steel plates). Further, each of the three-phase coils 22U, 22V, 22W is a segment coil, and is configured by welding approximately U-shaped conductor segments by welding.

  The stator core 21 includes an annular yoke 23 extending along the θ direction, and a plurality of teeth 24 projecting inward in the R direction from the inner circumferential surface of the yoke 23. The plurality of teeth 24 are arranged at regular intervals in the θ direction. A slot is formed between the teeth 24 adjacent in the θ direction, and the coils 22U, 22V, 22W are wound in a distributed winding around the teeth 24 through the slots. Lead wires 32U, 32V, 32W are provided at one end of each coil 22U, 22V, 22W. The lead wires 32U, 32V, 32W are radially outward extending ends of the radially extending portions 36U, 36V, 36W extending inward from the R direction, and the radially extending portions 36U, 36V, 36W. It includes an acute angle inclined portion 37U, 37V, 37W which is connected to the portion and which is inclined at an acute angle with respect to the Z direction so as to move outward in the R direction toward the end side. The acute inclined portions 37U, 37V, 37W may be located on an RZ plane defined by the R direction and the Z direction, or may be located on a plane inclined at an acute angle with respect to the RZ plane. In the acute-angled inclined portions 37U, 37V, 37W, the coated conductor portions 38U, 38V, 38W in which the conductor strands are coated with the insulating coating and the conductor strands are disposed closer to the end than the coated portions 38U, 38V, 38W Wire exposed portions 39U, 39V, 39W to be exposed are provided. The wire exposed portions 39U, 39V, 39W function as connection terminals to which the one ends 52U, 52V, 52W of the power lines 42U, 42V, 42W are electrically connected, respectively. The wire exposed portions 39U, 39V, 39W of the coils 22U, 22V, 22W are arranged at intervals in the θ direction from one side of the θ direction to the other side, the wire exposed portion 39U, the wire exposed portion 39V , Arranged in the order of the exposed wire portion 39W.

  One end 52U of the power line 42U is joined by welding to the exposed strand 39U of the coil 22U, and one end 52V of the power line 42V is joined by welding to the exposed strand 39V of the coil 22V, and one end of the power line 42W 52W is joined to the bare wire exposed portion 39W of the coil 22W by welding. The welding can be suitably performed by, for example, TIG (Tungsten Inert Gas) welding or laser welding. At the other end of each of the power lines 42U, 42V, 42W, terminals 62U, 62V, 62W to which an external electric circuit such as an inverter is electrically connected are respectively provided. The conductors of the power lines 42U, 42V, 42W are covered with an insulating coating except for one end 52U, 52V, 52W and the terminals 62U, 62V, 62W.

  The power line fastening member 44 is disposed on the outer peripheral side of the stator core 21. Three power line insertion holes are formed in power line fastening member 44, and three-phase power lines 42U, 42V, 42W are provided between one end 52U, 52V, 52W and terminal 62U, 62V, 62W at the other end. The intermediate portion is fixed to the power line fastening member 44 in a state of being inserted into the three power line insertion holes. Thus, the three-phase power lines 42U, 42V, 42W are mechanically fastened to each other. For example, an insulating material such as a resin can be used as the power line fastening member 44.

  Although not described in detail, the rotating electrical machine includes a rotor (not shown). The rotor is disposed on the inner peripheral side of the stator 1 at a distance from the stator 1. The stator 1 and the center of the rotor coincide. The rotor is an annular magnetic component fixed to the periphery of the rotation shaft, and, for example, a plurality of annular silicon steel plates (electromagnetic steel plates) are stacked. In the rotor, a plurality of permanent magnets are embedded circumferentially spaced from one another.

  The rotating electrical machine may function as either a motor or a generator, but when functioning as a motor generator, it operates as follows. First, when using a rotating electrical machine as a motor, for example, after the direct current from the battery is converted to a three-phase alternating current via an inverter, the three-phase alternating current is a power line 42U, 42V, The three-phase coils 22U, 22V and 22W are supplied via 42W. The teeth 24 are magnetized into magnetic poles by supplying the three-phase alternating current to the three-phase coils 22U, 22V, 22W, and a rotating magnetic field is generated in which the positions of the magnetic poles move along the θ direction of the stator 1. Then, the rotor rotates on the basis of the rotating magnetic field to generate rotational power.

  On the other hand, when using a rotating electrical machine as a generator and regenerating electric power, when the rotor is rotated by external power, permanent magnets embedded in the rotor rotate around the central axis of the rotor. Then, an induced electromotive force is induced in the three-phase coils 22U, 22V, 22W based on the law of electromagnetic induction, and an alternating current flows in the three-phase coils 22U, 22V, 22W. The AC power from the three-phase coils 22U, 22V, 22W based on the induced current is converted to DC power by the inverter and then supplied to the battery.

  Next, the superiority of the stator 1 of the present embodiment to the conventional stator 101 will be described with reference to FIGS. 2 and 3. In the present invention, although superiority exists in comparison with the conventional structure in the structure around the joint between the lead wire and the power line, it is the same in any of the U phase, the V phase and the W phase. Therefore, the superiority of the U-phase lead wire 32U and the U-phase power line 42U in comparison with the conventional structure of the joint peripheral structure is described, and the superiority of the joint peripheral structure corresponding to the U-phase in the V phase and W phase Description of sex is omitted. FIG. 2 is a schematic view of the vicinity of the junction between the U-phase lead wire 32U and the U-phase power line 42U of the stator 1, and FIG. 3 is a schematic view corresponding to FIG. In FIGS. 2 and 3, reference numerals 21 and 121 denote a stator core formed by laminating electromagnetic steel plates. The description of the stator cores 21 and 121 is omitted.

  As shown in FIG. 3, in the stator 101 of the conventional structure, the lead wire 132U provided at one end of the U-phase coil 122U includes a radially extending portion 136U and an axially extending portion 137U. The radially extending portion 136U extends radially inward from the R direction and outward in the R direction, and the axially extending portion 137U is connected to the outer end of the radially extending portion 136U in the R direction, It extends in the Z direction. The axially extending portion 137U has a coated portion 138U in which a conductor strand is coated with an insulating coating, and a strand exposed portion 139U provided on the tip end side of the coated portion 138U to expose the conductor strand. One end of the power line 142U is electrically connected to the wire exposed portion 139U, and a terminal 162U for electrically connecting an external electric circuit is provided at the other end of the power line 142U.

  As shown in FIG. 3, in the stator 101 of the conventional structure, since the axially extending portion 137U extends in parallel in the Z direction, the coated portion 138U and the wire exposed portion 139U of the axially extending portion 137U are R The outer diameter of the coated portion 138U is larger than the outer diameter of the wire exposed portion 139U, which is continuous with an annular step portion 140U that spreads in the direction. Therefore, since the coated portion 138U protrudes outward in the R direction with respect to the wire exposed portion 139U, one end of the power wire 142U electrically connected to the wire exposed portion 139U is located outward in the R direction. It is likely to interfere with the protruding film portion 138U and to easily ride on the film portion 138U. Accordingly, the power line 142U is inclined due to the above-mentioned run-up of one end of the power line 142U, and as a result, the terminal 162U provided at the other end of the power line 142U floats in the direction of inclination with respect to the R direction. Lifting occurs and it is difficult to position the terminal 162U with high accuracy.

  On the other hand, as shown in FIG. 2, according to the stator 1 of the present embodiment, the lead wire 32U of the U-phase coil moves in the R direction outward as it goes to the end side with respect to the Z direction Has an acute angle inclined portion 37U inclined at α (0 ° <α <90 °), and the acute angle inclined portion 37U is closer to the end than the coated portion 38U where the conductor wire is coated with the insulating coating and the coated portion 38U It includes a wire exposed portion 39U which is provided to expose the conductor wire. Therefore, since the wire exposed portion 39U moves outward in the R direction toward the end, the end of the wire exposed portion 39U is more likely to protrude outward in the R direction than the coated portion 38U. Therefore, one end 52U of the power wire 42U electrically connected to the wire exposed portion 39U is less likely to interfere with the coated portion 38U, and the one end 52U of the power wire 42U does not matter to the coated portion 38U Easy to bond to 39U with good accuracy. As a result, the terminal 62U on the other end side of the power line 42U is less likely to rise in the direction inclined with respect to the R direction, the assemblability of the power line 42U is improved, and the terminal 62U of the power line 42U can be positioned with high accuracy. Furthermore, the stress generated in the weld 83U due to the force the power line 42U receives from the covering portion 38U when correcting the power line 42U to the correct position can be reduced, and the welding quality can also be improved.

  Here, α is an acute angle, and any angle may be used as long as 0 ° <α <90 °. However, the preferred angle of α varies depending on the specification, and, for example, α is 1 ° or more, 2 ° or more, 3 ° or more, 4 ° or more, 5 ° or more, 7.5 ° or more, 10 ° or more, 12.5 It may be preferable if it is at least 15 °, at least 20 °, or at least 30 °. Moreover, it may be preferable that α is, for example, 60 ° or less, 45 ° or less, 30 ° or less, 15 °, or 12.5 ° or less.

  Furthermore, the present invention is not limited to the above-described embodiment and the modifications thereof, and various improvements and modifications can be made within the scope of the matters described in the claims of the present application and the equivalents thereof.

  For example, in the above embodiment, the terminal 62U on the other end side of the power line 42U does not easily rise in the direction inclined with respect to the R direction, and the terminal 62U of the power line 42U can be positioned with high accuracy. Therefore, the power line fastening member 44 for accurately positioning the power lines 42U, 42V, 42W may be omitted. In this case, the number of parts can be reduced, and the manufacturing cost can be reduced.

  In addition, although the case where the stator core 21 is configured by laminating a plurality of silicon steel plates (electromagnetic steel plates) has been described, the stator core may be configured by pressure molding a resin binder and magnetic material powder. . Further, although the case has been described in which each of the three-phase coils 22U, 22V, 22W is a segment coil and is formed by welding approximately U-shaped conductor segments by welding, the three-phase coil is a segment It may be a coil other than a coil. In addition, the stator coil may be wound around a plurality of teeth in concentrated winding. Thus, the technical idea of the present invention may be applied to the stator of any rotating electric machine having a different structure. In short, a stator core including an annular yoke and a plurality of teeth protruding inward in the R direction from the yoke at intervals in the θ direction, and wound around a plurality of teeth and including a multiphase coil A leader wire is provided which includes a stator coil, and at one end of each coil, an acute angled inclined portion which acutely inclines with respect to the Z direction so as to move outward in the R direction toward the end side. The inclined portion is provided with a coated portion in which a conductor strand is coated with an insulating coating, and a strand exposed portion disposed on the end side of the coating portion and exposing the conductor strand, and the strand exposed of each coil Any configuration different from the above embodiment may be employed as long as it is a stator provided with a power line whose one end is electrically connected to the part and a terminal is provided at the other end.

  1 Stator, 21 stator core, 22 U U-phase coil, 22 V V-phase coil, 22 W W-phase coil, 23 yoke, 24 teeth, 25 stator coil, 32 U, 32 V, 32 W leader line, 37 U, 37 V, 37 W acute angle inclined portion , 38U, 38V, 38W coating, 39U, 39V, 39W bare wire, 42U, 42V, 42W power line, 52U, 52V, 52W one end of power line, 62U, 62V, 62W power line terminal, R direction Radial direction of stator, θ direction Peripheral direction of stator, Z direction Stator height direction (axial direction).

Claims (1)

A stator core including an annular yoke, and a plurality of teeth projecting radially inward from the yoke at intervals in the circumferential direction of the yoke;
A stator coil wound around the plurality of teeth and including a coil of a plurality of phases;
Equipped with
At one end of each coil, a lead wire including an acute angled inclined portion which is acutely inclined with respect to the axial direction of the stator core is provided so as to move outward in the radial direction toward the end side;
The acute angle inclined portion is provided with a coated portion in which a conductor strand is coated with an insulating coating, and a strand exposed portion which is disposed closer to the end than the coated portion and in which the conductor strand is exposed.
A stator of a rotating electrical machine, further comprising a power line whose one end is electrically connected to the strand exposed portion of each coil and a terminal is provided at the other end.

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