JPS62123934A - Stator winding for rotary electric machine - Google Patents

Abstract

PURPOSE:To improve mechanical strength against the vibration of a winding end section, by forming a neutral point section with a ring astriding over the stator windings of respective phases. CONSTITUTION:U phase - W phase windings are organized with stator windings U1-U8, V1-V8, W1-W8 connected with interpole connecting wires 3. The U, V, and W phase winding ends are connected to a neutral point section 1 via leaders 2 respectively. The neutral point section 1a is formed with a ring 12 extended over the stator windings of U, V, and W phases respectively. The ring 12, the interpole crossover wires 3, and series wires 6 are bound with a binding wire 7 and are firmly integrated with one another. By this organization, even if vibration is applied to a stator winding 5 by an electromagnetic force or the like due to current on start, the vibration of the lead wires 5a, 5b of the winding start and winding end is suppressed.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a stator winding for a rotating electric machine.

[Background of the invention]

In general, rotating electric machines such as induction motors and alternating current generators are constructed with multiphase connections of three or more phases, and star connections (Y connections, see Figure 5) are often used to connect the stator windings. There is.

FIG. 6 shows a conventional example of the connection of stator windings of a three-phase induction motor using a six-pole single-row Y connection. These fifth. As is clear from FIG. 6, each U of the star-shaped connection has a neutral point portion 1.

The V- and W-phase windings include a leader wire 2 that connects to the neutral point 1, and an inter-pole span wire 3 that connects the poles. In other words, the U-phase winding is the stator winding U*, U2 connected by the pole-to-pole crossover wire 3.
, Ua, U4, Ua, U6, the V phase winding is the stator winding v1 to Ve connected by the pole span wire 3, and the W phase winding is the stator winding connected by the pole span wire 3. line Wl to W
It is composed of a. The ends of these U, V, and W phase windings are connected to the neutral point section 1 via lead wires 2, respectively.

FIG. 7 shows, for example, the stator winding U among the winding ends protruding from the core of the U, V, and W phase windings shown in FIG.

It is shown that some of the stator windings that make up the. As shown in the figure, lead wires 5a and 5b at the beginning and end of the adjacent winding 5 are connected in series to the ends of the stator winding 5 that protrude from the iron core 4. A series line 6 is provided, and the above-mentioned pole span line 3. A neutral point section 1 is provided. And these series lines 6. Pole crossing line 3
And the neutral point part 1 is bound and integrated with a binding thread 7.

The neutral point part 1 is made up of a neutral crossing wire 8 to which the lead wires of each phase winding are connected and spanning some of the stator windings, and this neutral crossing 1t9I8 is tied with a tie string 7 , is integrated. Furthermore, since the stator winding 5 vibrates due to the electromagnetic force generated by the current at startup, in order to prevent this, spacers 9 are installed between the windings 5, and support rings 10
．． 11 is provided, and this is tied and fixed with a binding thread 7.

By the way, in the fixed pre-winding 865 configured as described above, recently there has been a particular need to strengthen the support structure against the vibration of the winding 11A@ section due to the increase in capacity and voltage of rotating machines. In particular, the mechanical strength of the series wire 6, pole-to-pole span wire 31.1, and neutral span wire 8, which are located farthest from the iron core 4, is reinforced. Lead wire 5 at the beginning of winding line 6 and end of winding 1
It is necessary to increase the length of the connection insulating wrap dimension no.
I.

becomes larger. Therefore, when the ends of the windings vibrate due to electromagnetic force or the like, the connecting portions vibrate using the roots P and Q of the lead wires 5a, 5b as fulcrums, so that the longer the lead wires 5a, 5b are, the more vibration they receive. That is, the exit line 5a,
As the length 121 of the lead wires 5b increases, the stress at the bases P and Q of the lead wires 5a and 5b increases in proportion to the square of the length Ql.

Damage to the insulation or lead wire 5a at the roots P and Q
, 5b may cause accidents such as fatigue fracture.

Incidentally, there is, for example, Japanese Unexamined Utility Model Publication No. 57-89353, which is related to this kind of support structure for the end portion of the winding.

[Purpose of the invention]

The present invention has been made in view of the above points, and it is an object of the present invention to provide a stator winding for a rotating electric machine, which enables improvement in mechanical strength against vibrations at the ends of the winding.

[Summary of the invention]

That is, the present invention has a neutral point connected via a leader line,
Winding start and winding end wires connected by series wires are provided at the ends of the windings protruding from the iron core of the stator windings of each phase forming a star-shaped connection with interpole spanning wires. In the stator winding of a rotating electric machine, the neutral point section is formed by a ring that spans the stator winding of each phase, whereby the ends of the winding are fixed to each phase. It comes to be supported by a ring that spans the child winding.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment shown in one figure. Embodiment 7 of the present invention is shown in FIGS. 1 and 2. FIG. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the neutral point part 1a is each U, V, W.
The stator windings of the phases Us to Vz, Ws, Uz,
Vs e Wa, Us + VarW! ! ,
U4, Va, We v UI, r Ve t
Wt +Us HVt HW2 g Ut It was formed with a ring 12 spanning over the two. By doing this, the neutral point part 1a is formed by the ring 12 spanning the stator windings Us to Ut of each U, V, and W phase, and the end of one winding is
, V, W phase stator winding U1 to U sum ring 12
Accordingly, it is possible to obtain a stator winding for a rotating electric machine, which can be supported by the winding at the ends of the winding, thereby improving mechanical strength against vibrations at the ends of the winding.

In other words, the neutral point 1a is connected to the stator winding U of each U, V, and W phase.
From z to VZ, Ws, U2, Vg, Wa
tUs + VatWs * Ua
+ Va + We + UlleVe
, WL , US , Vt , W2 and UL, this ring 12 was placed near the pole-to-pole span line 3 and tied to the pole-to-pole span line 3 and the series line 6 with a tying thread 7. . That is, a ring 12 made of copper wire previously formed to a predetermined diameter is placed at a lower position of the interpole span wire 3,
Connect the lead wires 2 of each U, V, and W phase to this arranged ring 12, and insulate the connecting portion and the entire ring 12. Next, connect the ring 12 thus arranged, the interpole span wire 3, and the series wire 6. were tied together with tying thread 7 and firmly integrated. By doing this, even if the stator winding 5 is subjected to vibration due to electromagnetic force caused by the current at startup, the end of the winding (including the wire connection part) is fixed by the ring 12, and the winding starts. , the vibration of the lead wires 5a, 5b at the end of the winding is suppressed so that d≦, the stress at the roots P, Q of the lead wires 5a, 5b can be reduced, and the mechanical strength against vibration at the end of the winding is improved. This can improve the reliability of rotating machines.

Another embodiment of the invention is shown in FIG.

In this embodiment, the ring 12 is placed near the lead wire 5a at the beginning of winding, and is tied to the lead wire 5a with a tying thread 7. In this case, the ring 12 is placed near the opening 1iI5a at the beginning of the winding, and the height dimension H of the series tlA6 can be reduced, resulting in dimensional constraints in the height direction. This is effective when the vibration of the lead wire 5a at the beginning of winding needs to be particularly suppressed.

FIG. 4 shows yet another embodiment of the invention. In this embodiment, the ring 12a is placed near the end of the winding, and tied to the end of the winding with a tying thread 7. This ring 12a was formed from a brass round bar having greater mechanical strength than the above-mentioned ring. By doing this, the end of the winding is supported by a ring 12a made of a brass round rod and placed near the end of one winding, and the lead wire 5a is more secure than the case described above.

The stress applied to the roots P and Q of 5b can be reduced.

〔Effect of the invention〕

As described above, the present invention provides a stator winding for a rotating electric machine that has improved mechanical strength against vibration at the end of the winding, thereby making it possible to improve the mechanical strength against vibration at the end of the winding. be able to.

[Brief explanation of drawings]

Fig. 1 is a star-shaped wiring diagram of one embodiment of the stator winding of a rotating electrical machine of the present invention, Fig. 2 is a sectional view of the winding end along line A-A in Fig. 1, and Fig. 3 is A vertical cross-sectional side view of the winding end of another embodiment of the stator winding of the rotating electrical machine of the present invention, FIG. 4 is a winding end of still another embodiment of the stator winding of the rotating electrical machine of the present invention. Fig. 5 is a star-shaped wiring diagram of the stator winding of a rotating electrical machine, Fig. 6 is a star-shaped wiring diagram of the stator winding of a conventional rotating electrical machine, and Fig. 7 is a star-shaped wiring diagram of the stator winding of a conventional rotating electrical machine.
The figure is a sectional view of the winding aa section along the line BB in FIG. 6. 1a... Neutral point portion, 2... Leader line, 3... Interpole spanning line, 4... Iron core, 5... Stator winding, 5a...
Lead line at the beginning of the winding, 5b... Lead line at the end of the winding, 6...
Series line, 7... Binding thread, 12, 12 a-
Ring, Ul, Uz. Ua, Da, tJa r Us...U phase stator winding, Vs, V2, Vs, Va, Vs,
Vg ・=V phase stator winding, Wi+ Wz t Wa
t W4 e Ws + We (is η 1 stone) Figure 1 LIVW 3rd area of Z 4th Figure 5 6th sub-VW

Claims (1)

[Claims] 1. A winding end protruding from the iron core of the stator winding of each phase forming a star connection having a neutral point connected via a leader wire and a wire spanning between poles. In the stator winding of a rotating electric machine in which lead wires at the start and end of the winding are connected by series wires, the neutral point is formed by a ring spanning the stator winding for each phase. A stator winding for a rotating electric machine, which is characterized by: 2. The ring is arranged near the pole-to-pole spanning line,
The stator winding for a rotating electric machine according to claim 1, wherein the stator winding is tied to the pole-to-pole span wire and the series wire with a tie string. 3. Fixing of a rotating electric machine according to claim 1, wherein the ring is arranged near the lead wire at the start or end of winding, and is tied to the lead wire with a tying thread. Child winding. 4. The stator winding for a rotating electric machine according to claim 1, wherein the ring is arranged near the end of the winding and is tied to the end of the winding with a tying thread. 5. The stator winding for a rotating electrical machine according to claim 1, wherein the ring is formed by insulatingly coating a copper wire or a brass round bar.