JP7107663B2 - Rotating electric machine stator - Google Patents

Description

The present invention relates to a stator for rotating electric machines.

2. Description of the Related Art Conventionally, a stator for a rotary electric machine is disclosed in Japanese Unexamined Patent Application Publication No. 2002-200012. The stator includes a stator core and stator coils. The stator core has an annular yoke and a plurality of teeth that protrude radially inward from the yoke while being spaced apart from each other in the circumferential direction of the yoke. coil. One end of each coil is provided with a lead wire including a radially extending portion and an axially extending portion. The radially extending portion radially extends from the radially inner side to the radially outer side. The axially extending portion is connected to the radially outer end portion of the radially extending portion and extends in the axial direction of the stator core. The axially extending portion has a coating portion in which the conductor wire is coated with an insulating coating, and a wire exposed portion provided on the distal end side of the coating portion and exposing the conductor wire. One end of the power line is electrically connected to the wire exposed portion, and a terminal for electrically connecting an external electric circuit is provided to the other end of the power line.

JP 2016-36203 A

The coating portion of the axially extending portion is connected to the wire exposed portion via an annular stepped portion that expands in the radial direction, and has an outer diameter larger than the outer diameter of the wire exposed portion. Therefore, since the coating portion protrudes radially outward from the exposed portion of the wire, one end of the power line electrically connected to the exposed portion of the wire protrudes radially outward. It is easy to interfere with the part, and it is easy to receive force from the film part. Therefore, one end of the power line tends to tilt due to the force from the coating portion, and it is difficult to precisely position the terminal provided at the other end of the power line.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a stator for a rotating electric machine that facilitates increasing the positional accuracy of power line terminals.

In order to solve the above problems, a stator for a rotary electric machine according to the present invention is a stator core that includes an annular yoke and a plurality of teeth radially inwardly projecting 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 multi-phase coil. A lead wire including an acute-angled portion inclined with respect to the axial direction of the stator core is provided as shown in FIG. A motive power in which a wire exposed portion is provided at the end side and exposes the conductor wire, one end is electrically connected to the wire exposed portion of each coil, and a terminal is provided at the other end. A line is further provided, and the acute-angled portion is inclined at an acute angle with respect to the axial direction from the radially outward end of the radially extending portion extending radially outward from the radially inner side. and the terminals of the power line extend substantially parallel to a plane orthogonal to the axial direction, and the power lines of the plurality of phases are not fastened by a power line fastening member, Each of the power lines of the plurality of phases does not receive force from the power line fastening member, and the power lines are not in contact with the coated portion.

According to the stator for a rotary electric machine according to the present invention, the lead wire of the coil has the acute-angled portion inclined at an acute angle with respect to the axial direction so as to move outward in the radial direction toward the end side. The inclined portion includes a coated portion in which the conductor wire is coated with an insulating coating, and a exposed wire portion provided on the end side of the coated portion to expose the conductor wire. Therefore, since the exposed wire portion moves radially outward as it goes toward the end side, the end side of the exposed wire portion is more likely to project radially outward than the coating portion. Therefore, one end of the power line electrically connected to the exposed wire portion is less likely to interfere with the coating portion of the acute-angled portion, and the one end portion of the power line can be precisely connected to the exposed wire portion regardless of the coating portion. Can be spliced. As a result, the assembling property 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 that the power line receives from the coated portion when correcting the power line to the correct position can be reduced, and the welding quality can be improved.

1 is a partial perspective view of a stator of a rotary electric machine according to one embodiment of the present invention; FIG. FIG. 3 is a schematic diagram of the vicinity of a junction between a U-phase lead wire and a U-phase power line of the stator; FIG. 3 is a schematic diagram corresponding to FIG. 2 in a conventional stator;

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that the characteristic portions thereof will be appropriately combined to construct a new embodiment. Further, in the following drawings and description of the embodiments, 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 ( axial direction). The R direction, θ direction, and Z direction are orthogonal to each other.

FIG. 1 is a partial perspective view of a stator 1 for a rotating electric machine according to one embodiment of the present invention. In FIG. 1, a part of the configuration of the stator core 21 and the coils 22U, 22V, and 22W is omitted in the θ direction, but the configuration of the rest of the omitted portions differs from that illustrated. It has the same configuration.

The stator 1 includes a stator core 21; a stator coil 25 including three-phase coils 22U, 22V, and 22W wound around the stator core 21; power lines 42U, 42V, 42W and three-phase power lines 42U, 42V, 42W. The stator core 21 is an annular magnetic component, and is configured by laminating a plurality of silicon steel plates (electromagnetic steel plates), for example. Each of the three-phase coils 22U, 22V, and 22W is a segment coil, and is configured by joining substantially U-shaped conductor segments by welding.

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 peripheral surface of yoke 23 . The plurality of teeth 24 are arranged at intervals (equally spaced) from each other 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 around the teeth 24 through the slots by distributed winding. Lead wires 32U, 32V, 32W are provided at one end of each of the coils 22U, 22V, 22W. The lead lines 32U, 32V, and 32W are formed from radially extending portions 36U, 36V, and 36W extending from the inside to the outside in the R direction, and the radially extending portions 36U, 36V, and 36W at their outer ends in the R direction. Acute-angled inclined portions 37U, 37V, and 37W are connected to the portion and 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-angle inclined portions 37U, 37V, and 37W may be positioned on the RZ plane defined by the R direction and the Z direction, or may be positioned on a plane inclined at an acute angle to the RZ plane. In the acute-angle inclined portions 37U, 37V, and 37W, there are coated portions 38U, 38V, and 38W in which the conductor wires are coated with an insulating coating, and the conductor wires are arranged on the end side of the coated portions 38U, 38V, and 38W. Exposed wire exposed portions 39U, 39V, and 39W are provided. The exposed wire portions 39U, 39V, 39W function as connection terminals to which one end portions 52U, 52V, 52W of the power lines 42U, 42V, 42W are electrically connected, respectively. The exposed wire portions 39U, 39V, and 39W of the coils 22U, 22V, and 22W are spaced apart from each other in the .theta. , the wire exposed portion 39W.

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

The power line fastening member 44 is arranged on the outer peripheral side of the stator core 21 . Three power line insertion holes are formed in the power line fastening member 44, and three-phase power lines 42U, 42V, 42W are connected between one end 52U, 52V, 52W and terminals 62U, 62V, 62W at the other end. The intermediate portion is fixed to the power line fastening member 44 while being inserted into the three power line insertion holes. Thereby, the three-phase power lines 42U, 42V, and 42W are mechanically fastened together. As the power line fastening member 44, for example, an insulating material such as resin can be used.

Although not described in detail, the rotating electrical machine includes a rotor (not shown). The rotor is arranged on the inner peripheral side of the stator 1 with a space therebetween. The center of the stator 1 and the rotor coincide. The rotor is an annular magnetic component that is fixed around the rotating shaft, and is configured by laminating a plurality of annular silicon steel plates (electromagnetic steel plates), for example. A plurality of permanent magnets are embedded in the rotor while being spaced from each other in the circumferential direction.

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 a rotating electrical machine is used as a motor, for example, after a DC current from a battery is converted into a three-phase AC current via an inverter, the three-phase AC current is supplied to power lines 42U, 42V, 42W to three-phase coils 22U, 22V, and 22W. By supplying the three-phase alternating current to the three-phase coils 22U, 22V, and 22W, the teeth 24 are magnetized to become magnetic poles, 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 based on the rotating magnetic field, and rotational power is generated.

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

Next, the superiority of the stator 1 of the present embodiment over the stator 101 of the conventional configuration will be described with reference to FIGS. 2 and 3. FIG. In addition, in the present invention, there is an advantage in comparison with the conventional structure in the structure around the junction of the lead wire and the power line, but this is the same for any of the U-phase, V-phase, and W-phase. Therefore, the superiority of the joint peripheral structure of the U-phase lead wire 32U and the U-phase power line 42U in comparison with the conventional structure will be explained, and the superiority of the joint peripheral structure corresponding to the U-phase in the V-phase and W-phase A description of the nature of the material is omitted. FIG. 2 is a schematic diagram 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 diagram of the conventional stator 101 corresponding to FIG. 2 and 3, reference numerals 21 and 121 denote stator cores formed by laminating electromagnetic steel sheets. Description of the stator cores 21 and 121 is omitted.

As shown in FIG. 3, in the conventional stator 101, 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 radially extends from the inside in the R direction to the outside in the R direction, and the axially extending portion 137U is connected to the outer end in the R direction of the radially extending portion 136U, Extends in the Z direction. The axially extending portion 137U has a coated portion 138U in which the conductor wire is coated with an insulating coating, and a wire exposed portion 139U provided on the distal end side of the coated portion 138U and exposing the conductor wire. One end of power line 142U is electrically connected to exposed wire portion 139U, and a terminal 162U for electrically connecting an external electric circuit is provided at the other end of power line 142U.

As shown in FIG. 3, in the stator 101 having the conventional structure, the axially extending portion 137U extends parallel to the Z direction. The outer diameter of the coating portion 138U is larger than the outer diameter of the wire exposed portion 139U. Therefore, since the coating portion 138U protrudes further outward in the R direction than the exposed wire portion 139U, one end of the power line 142U electrically connected to the exposed wire portion 139U extends outward in the R direction. It is easy to interfere with the protruding coating portion 138U, and it is easy to ride on the coating portion 138U. Therefore, the power line 142U is tilted due to one end of the power line 142U being run over, and as a result, the terminal 162U provided at the other end of the power line 142U is lifted in a direction inclined with respect to the R direction. A float 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 is arranged in the Z direction so as to move outward in the R direction toward the end side. (0°<α<90°). It includes a wire exposure portion 39U provided to expose the conductor wire. Therefore, since the exposed wire portion 39U moves outward in the R direction toward the end side, the end side of the exposed wire portion 39U is more likely to protrude outward in the R direction than the coating portion 38U. Therefore, one end portion 52U of the power line 42U electrically connected to the exposed wire portion 39U is less likely to interfere with the coating portion 38U, and the one end portion 52U of the power line 42U is connected to the exposed wire portion regardless of the coating portion 38U. It is easy to join to 39U with high accuracy. As a result, the terminal 62U on the other end side of the power line 42U is less likely to float in a direction inclined with respect to the R direction, improving the assembling property of the power line 42U, and positioning the terminal 62U of the power line 42U with high accuracy. Furthermore, when the power line 42U is corrected to the correct position, the stress generated in the welded portion 83U due to the force that the power line 42U receives from the covering portion 38U can be reduced, and the welding quality can be improved.

Note that α is an acute angle and may be any angle as long as 0°<α<90°. However, the preferred angle of α varies depending on the specifications. ° or more, 15° or more, 20° or more, or 30° or more may be preferred. Also, it may be preferable if α is, for example, 60° or less, 45° or less, 30° or less, 15° or 12.5° or less.

Moreover, the present invention is not limited to the above-described embodiments and modifications thereof, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents.

For example, in the above-described embodiment, the terminal 62U on the other end side of the power line 42U is less likely to float in a 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.

Moreover, although the stator core 21 is configured by laminating a plurality of silicon steel plates (electromagnetic steel plates), the stator core may be configured by pressure-molding a resin binder and magnetic material powder. . Also, the case where each of the three-phase coils 22U, 22V, and 22W is a segment coil and is configured by joining substantially U-shaped conductor segments by welding has been described. A coil other than the coil may be used. Also, the stator coil may be wound around a plurality of teeth by concentrated winding. In this way, the technical idea of the present invention may be applied to any stator of a rotating electric machine having a different structure. In short, the stator core includes an annular yoke, a plurality of teeth protruding inward from the yoke in the R direction while being spaced apart from each other in the θ direction, and a multi-phase coil wound around the plurality of teeth. and a stator coil, and a lead line including an acute-angled inclined portion inclined with respect to the Z-direction so as to move outward in the R direction toward the end is provided at one end of each coil. The inclined portion is provided with a coating portion in which the conductor element wire is coated with an insulating coating, and a wire exposure portion disposed on the end side of the coating portion and exposing the conductor wire, and the wire exposure of each coil is provided. Any configuration different from the above embodiments may be employed as long as the stator includes a power line having one end electrically connected to a portion and a terminal provided at the other end.

1 Stator 21 Stator Core 22U U-Phase Coil 22V V-Phase Coil 22W W-Phase Coil 23 Yoke 24 Teeth 25 Stator Coil 32U, 32V, 32W Lead Wire 37U, 37V, 37W Acute Inclined Part , 38U, 38V, 38W Coating part 39U, 39V, 39W Wire exposed part 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 Circumferential direction of stator, Z direction Height direction (axial direction) of stator.

Claims (1)

a stator core including an annular yoke and a plurality of teeth projecting radially inward from the yoke while being spaced from each other in the circumferential direction of the yoke;
A stator coil wound around the plurality of teeth and including a multi-phase coil,
One end of each of the coils is provided with a lead line including an acute-angled portion inclined with respect to the axial direction of the stator core so as to move outward in the radial direction toward the end,
The acute-angled portion is provided with a coating portion in which the conductor wire is coated with an insulating coating, and a wire exposed portion that is disposed on the end side of the coating portion and exposes the conductor wire,
further comprising a power line having one end electrically connected to the wire exposed portion of each coil and having a terminal provided at the other end;
The acute-angled portion extends in a direction inclined at an acute angle with respect to the axial direction from the radially outer end portion of the radially extending portion extending radially outward from the radially inner side. ,
the terminals of the power line extend substantially parallel to a plane perpendicular to the axial direction;
The power lines of the plurality of phases are not fastened by a power line fastening member, and each of the power lines of the plurality of phases does not receive force from the power line fastening member ,
A stator for a rotary electric machine, wherein the power line is not in contact with the coating portion.

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