JP2003204644A - Ac rotating electric machine stator and winding structure of ac rotating electric machine stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in the connection of conventional segmented winding that there is a very large potential difference between the reverse and normal phase coils inserted into the same slot. <P>SOLUTION: In a segmented wound motor with the number of pole pairs of 8, the phase difference between the end of reverse phase winding and the start of normal phase winding is controlled to a value equivalent to 80°± equivalence to one magnetic pole, in terms of the mechanical angle. Thus, the potential difference between reverse phase winding and normal phase winding in the same slot can be reduced to approx imately, and 75% of the potential difference between X1 terminal and X1' terminal at a maximum. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a stator of a rotary electric machine for a vehicle. In particular, the present invention relates to a stator having a winding formed by joining a plurality of electric conductor segments to each other.

[0002]

2. Description of the Related Art Conventionally, in a stator of an alternator for a vehicle, a plurality of segments made of U-shaped electric conductors are used, each segment is inserted into a slot of a stator core, and then the segments are joined together. There is known a structure in which a winding for one phase is configured (for example, Japanese Patent No. 2927288).
No.).

FIG. 5 is a diagram showing a connection state of a conventional segment type winding (the number of pole pairs of a segment type winding motor is 8). Phase X1 is wound from slot (4) (inside slot () indicates the slot number) to every sixth slot (slot (4), slot (94), slot (88), ...) Up to slot (10). Reversed phase winding (thick line in Fig. 5)
From the slot (16), every 6 slots (slot (16), slot (22), slot (28) ...)
A normal phase winding (thick dotted line in FIG. 5) wound up to the slot (10) is connected in series. The phase difference between the winding end of the reverse phase winding and the winding start of the normal phase winding is one magnetic pole.

Thus, each phase of the segment winding is
It is composed of normal-phase windings and reverse-phase windings, and conductors forming both are inserted in pairs in all slots.

[0005]

FIG. 6 shows the potentials of the anti-phase winding and the normal-phase winding in each slot for the X1 phase and the anti-phase in the same slot when the conventional segment type winding is connected. -It is a graph showing the potential difference between the normal phase windings. Here, for simplification, only the X1 phase is shown, but the other 5 phases have the same phase difference but different phases. In the graph of FIG. 6, Vn represents the potential in each slot of the reverse phase winding, and Vp represents the potential in each slot of the normal phase winding. Further, ΔV represents the potential difference (ΔV = Vp−Vn) between Vn and Vp in the same slot. The vertical axis is based on the potential difference between the X1 terminal and the X1 'terminal (= 1)
Indicates the relative voltage. ΔV is maximum in the slot (4), which is very high, about 94% of the potential difference between the X1 terminal and the X1 ′ terminal.

As described above, in the connection state of the conventional segment type winding, the normal phase winding and the negative phase winding have opposite winding directions, and since they are independent windings, they are inserted in the same slot. Depending on the location, a very high potential difference is generated between the two windings, which may reduce the insulation reliability between the windings.

Therefore, an object of the present invention is to provide an AC rotary electric machine stator and a winding structure of the AC rotary electric machine stator which can solve the above problems.

[0008]

That is, according to the present invention, a plurality of segments of U-shaped electric conductors inserted in slots of a stator core are joined together to form a reverse phase winding and a normal phase winding. In a stator of an AC rotary electric machine in which a winding for one phase is formed by connecting the ends of the negative-phase windings and the ends of the normal-phase windings in series, the ends of the negative-phase windings are formed. When the number of pole pairs is even, the phase difference between the part and the end of the normal phase winding is 180 ° ± 1 magnetic pole in mechanical angle, and when the number of pole pairs is odd,
It is wired so that the mechanical angle is 180 °.

Here, the angle of one magnetic pole is obtained by 180 ° / number of pole pairs. According to this, the maximum value of the potential difference between the reverse phase winding and the normal phase winding in the same slot can be significantly reduced as compared with the conventional maximum value of the potential difference.

Further, according to the present invention, a plurality of segments of U-shaped electric conductors inserted in the slots of the stator core of an AC rotary electric machine are joined together to form a reverse phase winding and a normal phase winding. A winding structure in which a winding for one phase is formed by connecting the end of the negative phase winding and the end of the normal phase winding in series, and the end of the negative phase winding is If the number of pole pairs is even, the phase difference from the end of the normal phase winding is 180 ° in mechanical angle.
± 1 magnetic pole and the number of pole pairs is odd, 180 mechanical angle
It is wired so that it becomes °.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described through embodiments of the invention.

FIG. 1 is a diagram showing a connection state of the segment winding 100 according to the embodiment. The segment winding motor of this embodiment has eight pole pairs. The X1 phase in this embodiment is from the slot (4) to every 6 slots (slot (4), slot (94), slot (8).
8) ...) to the slot (10) up to the reverse phase winding (thick line in FIG. 1) and from the slot (52) every 6 slots (slot (52), slot (58), slot (64). ) ...) and a normal phase winding (thick dotted line in FIG. 1) wound up to the slot (46) are connected in series. The phase difference between the winding end of the antiphase winding and the winding start of the normal phase winding is 180 ° -1 magnetic pole (= 157.5 °) in mechanical angle. Here, the angle of one magnetic pole is 180 ° / 8 (number of pole pairs) = 22.5 °.

FIG. 2 shows the potentials of the anti-phase winding and the normal-phase winding in each slot for the X1 phase and the anti-phase-normal in the same slot in the connected state of the segment winding 100 according to the present embodiment. 7 is a graph showing a potential difference between phase windings. Here, Vp, Vn, and ΔV are the same as those described with reference to FIG.

ΔV in this embodiment is maximum in the slot (4), but is suppressed to about 75% of the potential difference between the X1 terminal and the X1 ′ terminal. It can be seen that the potential difference is significantly reduced compared to the conventional connection state. As a result, it is possible to improve the insulation reliability between the windings by reducing the potential difference generated between the windings in the same slot.

Although FIG. 1 and FIG. 2 exemplify the X1 phase, the other five phases are different only in the winding start slots of the antiphase winding and the normal phase winding, and the antiphase winding of the antiphase winding is different. Similar to the X1 phase, the phase difference between the end of winding and the beginning of winding of the normal phase winding is 180 ° mechanical angle−one magnetic pole.

FIG. 3 is a diagram showing a connection state of the segment type winding 110 according to another embodiment. The segment winding motor of this embodiment has eight pole pairs. In the present embodiment, the X1 phase is the reverse phase winding (from the slot (4) to the slot (10) every 6 slots (slot (4), slot (94), slot (88), ...) (6). 3) and the normal phase winding (FIG. 3) wound from the slot (64) to the slot (58) every 6 slots (slot (64), slot (70), slot (76), ...). (Thick dotted line 3) is connected in series.
The phase difference between the winding end of the reverse phase winding and the winding start of the normal phase winding is 180 ° in mechanical angle + 1 magnetic pole (= 202.5 °
(Or −157.5 °)).

FIG. 4 shows the potentials of the antiphase winding and the normal phase winding in each slot and the antiphase-normal phase winding in the same slot when the segment type winding 110 according to another embodiment is connected. It is a graph showing the potential difference between the two. here,
Vp, Vn, and ΔV are the same as those described with reference to FIG.

In the present embodiment, ΔV is the slot (5
It becomes the maximum in 8), but it is suppressed to about 75% of the potential difference between the X1 terminal and the X1 ′ terminal. It can be seen that the potential difference is significantly reduced compared to the conventional connection state.
As a result, it is possible to improve the insulation reliability between the windings by reducing the potential difference generated between the windings in the same slot.

Although FIG. 3 and FIG. 4 exemplify the X1 phase, the other 5 phases are different only in the winding start slots of the reverse phase winding and the normal phase winding, and the reverse phase winding of the reverse phase winding is different. Like the X1 phase, the phase difference between the end of winding and the beginning of winding of the normal phase winding is 180 ° mechanical angle + 1 magnetic pole.

The connection state of the segment type windings 100 and 110 when the number of pole pairs of the segment type winding motor is 8 has been described above. However, when the number of pole pairs is even, the reverse phase winding of each phase is By setting the phase difference between the end of winding and the beginning of winding of the normal phase winding to a mechanical angle of 180 ° ± 1 magnetic pole,
The potential difference generated between the windings in the same slot can be reduced. Expressing this in a generalized form, the number of pole pairs is 2n.
For (n is a natural number of 2 or more), the phase difference = (2n ±
1) x 1 magnetic pole angle.

When the number of pole pairs is odd, when the number of pole pairs is 3 or more, the phase difference between the winding end of the reverse phase winding of each phase and the winding start of the normal phase winding is calculated. Corner 180
By setting the angle to be minutes, the potential difference generated between the windings in the same slot can be reduced.

In the above description, a pair of reverse-phase windings and normal-phase windings is connected in the same slot. However, there are two or more pairs of reverse-phase windings and normal-phase windings. Needless to say, the same effect can be obtained.

[0023]

As is apparent from the above description, according to the present invention, the insulation difference between the windings can be improved by reducing the potential difference between the windings in the same slot. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a connection state of a segment winding 100 according to an embodiment.

FIG. 2 is a segment winding 100 according to the present embodiment.
6 is a graph showing the potentials of the reverse phase winding and the normal phase winding in each slot and the potential difference between the reverse phase-normal phase winding in the same slot for the X1 phase in the connection state of FIG.

FIG. 3 is a segment type winding 11 according to another embodiment.
It is a figure which shows the connection state of 0.

FIG. 4 is a segment winding 11 according to another embodiment.
6 is a graph showing the potentials of the reverse phase winding and the normal phase winding in each slot and the potential difference between the reverse phase-normal phase winding in the same slot for the X1 phase in the 0 connection state.

FIG. 5 is a diagram showing a connection state of a conventional segment winding 120.

FIG. 6 shows the potentials of the reverse phase winding and the normal phase winding in each slot for the X1 phase and the potential difference between the reverse phase and the normal phase winding in the same slot in the conventional segmented winding 120 connection state. It is a graph showing.

[Explanation of symbols]

100,110 segment winding, 120 conventional segment winding.

Claims (2)

[Claims] 1. A negative phase winding and a normal phase winding are formed by joining a plurality of U-shaped electric conductor segments inserted into slots of a stator core to form a negative phase winding and a normal phase winding. In a stator of an AC rotary electric machine in which a winding for one phase is formed by connecting in series with an end of a normal phase winding, an end of a reverse phase winding and an end of the normal phase winding The phase difference between
When the number of pole pairs is an even number, the mechanical angle is 180 ° ± 1 magnetic pole, and when the number of pole pairs is an odd number, the mechanical angle is 180 °. stator. 2. A reverse-phase winding and a normal-phase winding are formed by joining a plurality of segments of U-shaped electric conductors inserted in slots of a stator core of an AC rotating electric machine to form a reverse-phase winding and a normal-phase winding. A winding structure in which a winding for one phase is formed by connecting an end of a wire and an end of a normal phase winding in series, wherein an end of a reverse phase winding and a normal phase winding are provided. The phase difference between the end of
The winding structure is characterized in that when the number of pole pairs is an even number, the mechanical angle is 180 ° ± 1 magnetic pole, and when the number of pole pairs is an odd number, the mechanical angle is 180 °.