JP2599147B2 - Rotating electric machine stator winding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stator winding of a rotating electric machine.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 60-35932, the end of the bus-side wire ring and the neutral point-side wire end are drawn out, and after a certain period of operation, the terminals of the bus-side wire and the neutral point side wire are connected. It is known that the switching is effective in extending the life of the insulation of the stator coil. However, as shown in FIGS. 10 and 11, small motors, generators, and the like generally have their bus and neutral points pulled out from the same position by rubber insulated wires or cables. Therefore, it is easy to replace the end of the bus line and the end of the neutral line.
As shown in FIG. 14 and FIG. 14, the bus bar side lead wire passes through the stator frame 1, crosses the inside of the wind path 2 provided on the outer periphery of the stator frame, and is provided on the outer peripheral wall of the wind path. Connected to the phase-separated bus 3 via the terminal part. On the other hand, the neutral-point-side lead wire passes through the stator frame 1, is short-circuited in the wind path 2 for three phases, and is grounded via the grounding resistor 4. Accordingly, the bus-side withdrawal position is determined by the phase-separated bus 3 at a convenient location of the main transformer wiring. The neutral lead wire is determined by the installation location of the grounding resistor 4. Since the phase-separating bus 3 and the grounding resistor 4 are large in size, they cannot be installed in the same place, and are generally grounded separately as shown in FIGS. 12 and 14. In order to exchange the bus side and the neutral point side in the state of FIG. 12, as shown in FIG. 13, the bus side exchange line 5 previously installed in the wind path 2 and the neutral point It exchanges using the side exchange line 6. Also, in the case of FIG. 14, in order to exchange the bus side and the neutral point side in the state of FIG. 14, they were previously installed in the wind path 2 as shown in FIG. The exchange was performed using the bus-side exchange line 5 and the neutral-point exchange line 6.

[Problems to be solved by the invention]

With the above prior art, small motors and generators could be replaced without any problems.However, in large machines, air coolers, cooling water pipes, various wiring pipes, inspection passages, etc. And the bus-side exchange line and the neutral-point exchange line must be installed thereon, and the diameter of the wind path must be increased in order to install them. This not only increases the size of the entire machine, but also the long wiring of high-voltage and high-current exchange lines in the wind path is a dangerous structure for maintenance and inspection.

The present invention has been made in view of the above points, has a safe structure without increasing the size of the machine, is convenient for maintenance and inspection,
It is another object of the present invention to provide a rotating electric machine stator winding capable of exchanging a bus line and a neutral point line in a short time.

[Means for solving the problem]

That is, the present invention includes a stator wire loop housed in a stator core supported by a stator frame and connected in a three-phase star, and the bus of the stator wire loop in each of the star connection phases. The side wire loop end and the neutral point wire loop end are respectively connected to a busbar terminal and a neutral point side terminal provided on the wind path outer peripheral wall arranged outside the stator frame via a lead wire, and In each of the stator windings of the phase, in the rotating electric machine stator winding in which the busbar side wire end and the neutral point side wire end are formed so as to be exchangeably connectable to the terminal, from the wire end. A part of the lead wire that is drawn out and connects the end of the wire loop and the terminal is provided so as to be crawled in the stator frame, and a connection exchange part is provided in a portion of the lead wire crawling in the stator frame. In the replacement part, the end of the bus-side wire loop and the neutral point-side wire loop are crossed using a wire prepared in advance. To thus-formed intended purpose is obtained so as to achieve.

[Operation] A part of the bus-side lead wire and the neutral point-side lead wire arranged in the stator frame are exchanged, so that the bus-side wire ring and the neutral point-side wire ring are exchanged. Therefore, it is no longer necessary to wire high-voltage, large-current exchange lines in the wind path as in the past,
With a safe structure without increasing the size of the machine, it is convenient for maintenance and inspection, and the bus wheel and the neutral wire can be replaced in a short time.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
1 and 2 show one embodiment of the present invention. The same parts as those in the related art are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, a busbar-side lead wire 7 and a neutral point-side lead wire 8 are provided in the stator frame 1, and these lead wires 7,
Replace part of 8 to connect the bus side wire to the neutral terminal and the neutral point side wire to the bus side terminal without changing the arrangement of the stator core in the stator core. The ring was replaced with the neutral side wire. In this way, the machine has a safe structure without increasing the size of the machine, is convenient for maintenance and inspection, and allows the bus wire and the neutral wire to be replaced in a short period of time. Thus, it is possible to obtain a rotating electric machine stator winding that has a safe structure without any trouble, is convenient for maintenance and inspection, and can replace the bus wire and the neutral wire in a short time.

That is, the present embodiment is a case of a machine having a small current capacity, and as shown in FIG. 1 showing a connection structure inside the stator frame 1, each wire loop is connected, and 7 and an extension thereof, and a neutral point side lead wire 8 and an extension thereof, penetrate the stator frame 1 and are arranged on the outer periphery of the stator frame 1 (not shown here; see FIG. 12). Drawn into. In the figure, UX, VY,
WZ indicates the end of each phase wire loop. This will be described with reference to FIGS. 3 and 4 for the UX phase. After each wire loop is assembled in the iron core groove, it is sequentially connected. The bus bar side is connected to the bus bar side lead wire 7 from the stator wire loop a (see FIG. 3). It is drawn out into the wind path and connected to the U phase of a phase separation bus (not shown, see 3 in FIG. 12). Similarly, the neutral point side is connected to the neutral point side lead wire 8 from the stator wire ring n (see FIG. 3), and is drawn out to the wind path from the stator frame 1 through the connection portion 10 to form the phase separation bus. Connected to X phase.

When the bus-side wire and the neutral-point wire are exchanged from this state, as shown in FIG. 2, the bus-side wire 7 and the neutral-point wire 8 are connected at the connecting portions 9 and 10, respectively. Dismantle. Then, the auxiliary lead wire 11 manufactured and prepared in advance is connected between the stator wire a and the connecting portion 10, and the stator wire a on the busbar side is connected via the auxiliary lead wire 11 and the connecting portion 10. From the neutral point side draw position into the wind path. That is, the stator wire ring a on the bus side is connected to the X phase on the neutral point side. Next, the auxiliary lead wire 12 prepared in advance is connected between the stator wire loop n and the connection portion 9, and the stator wire loop n on the neutral point side is connected via the auxiliary lead wire 12 and the connection portion 9. Pull out from the busbar side draw position into the airway.
That is, the stator wire loop n on the neutral point side is connected to the U phase on the bus side. In the same manner, the other VY phase and WZ phase are exchanged through auxiliary lead wires and connection parts which are prepared in advance. By doing so, FIG. 1 becomes FIG. 2 and
The connection shown in FIG. 3 to FIG. 4 is completed, and the bus line and the neutral point line are replaced. The auxiliary lead wires 11 and 12 prepared in advance are delivered in the stator frame 1.

As described above, according to the present embodiment, by replacing a part of the lead wire in the stator frame, it is possible to exchange the bus side line ring and the neutral point side line ring. Installation becomes unnecessary, a safety passage can be provided without affecting various components installed in the wind path, and maintenance work becomes easy.

5 to 9 show another embodiment of the present invention. Although the present embodiment is a case of a large current and large capacity machine, this embodiment can also be carried out in the same manner as the above-described case, and can achieve the same operation and effect. The current that can flow through one stator wire is limited by electrical and mechanical characteristics, manufacturing techniques, and the like. For this reason, in large-capacity machines, the number of star-connected parallel circuits is increased, and the current flowing through each stator wire loop is kept within the allowable current, so that the entire machine can flow a large current as a whole. And a structure having a connection conductor 13. That is, as shown in FIGS. 5 to 7, the connection conductor 13 is supported by the connection conductor support 14 in the stator frame 1, and the bus side and the neutral point side are respectively drawn out. The connecting conductor 13 is drawn out of the wind path through the stator frame 1 from a predetermined position, and U, V, W, X, Y, and Z represent phase separation on the bus side and neutral point side of each phase. In the figure, reference numeral 15 denotes a stator wire loop, and reference numeral 16 denotes a stator core. Further, as shown in FIG. 8, which is a development view as viewed from PP in FIG. 5, the connecting conductor 13 has a predetermined length L due to restrictions on conductor production and assembly techniques. Divided and assembled, each connecting piece
They are connected by 17 and become one.

That is, the connection conductors 13A, 13B, and 13C having the phase separation buses U, V, and W of the busbar side lead-out portion that is a part of the connection conductor 13, and the connection having the phase separation buses X, Y, and Z of the neutral point side leadout portion. The conductors 13D, 13E, and 13F are made equal to the dimension L, and the connecting conductor 13G at the lead portion between the connecting conductor supports 14 is also made the same dimension L. When replacing the bus-side wire and the neutral-side wire after continuing operation for a predetermined time in this state, first, the connection conductors 13A, 13B, 13C and 13G of the bus-side lead-out portion in FIG. Dismantle in parts. Next, the connection conductors 13D, 13E, 13F and 1
3G is dismantled at the connection piece 17. The connection conductors 13A, 13B, 13C, and 13G having the phase separation buses U, V, and W of the disassembled busbar side lead-out portion are connected to the neutral point side via the connection piece 17. Subsequently, connection conductors 13D, 13E, and 13F having phase separation buses X, Y, and Z at the neutral point side lead-out portion
Is connected to the bus side via a connection piece 17 (see FIG. 9).
By doing so, the busbar side wire loop and the neutral point side wire loop are exchanged in the stator frame as shown in FIG. 4 described above, and the same operation and effect as in the above case are obtained. Can be played.

〔The invention's effect〕

As described above, the present invention has a safe structure without increasing the size of the machine, is convenient for maintenance and inspection, and can replace the bus wire and the neutral wire in a short time. It is possible to obtain a rotating electric machine stator winding that has a safe structure without increasing the size of the machine, is convenient for maintenance and inspection, and enables replacement of the bus wire and the neutral wire in a short time. .

[Brief description of the drawings]

FIG. 1 is a front view showing a lead wire structure in a stator frame of one embodiment of a stator winding of a rotating electric machine according to the present invention, and FIG. 2 is a part of the lead wire of FIG. Front view showing a state in which the bus side and the neutral point side have been exchanged, FIG. 3 shows a three-phase star single line connection diagram, and FIG. 4 shows an exchange between the bus side and the neutral point side in FIG. FIG. 5 is a front view showing a lead wire (connection conductor) structure in a stator frame of another embodiment of the rotating electric machine stator winding of the present invention, and FIG. 5 is a cross-sectional view taken along the line AA, FIG. 7 is a cross-sectional view taken along the line BB in FIG. 5, FIG. 8 is a development view from PP in FIG. 5, and FIG. FIG. 8 is a development view showing a state in which a part of the connection conductor is replaced to exchange the bus side and the neutral point side, and FIG. 10 is a front view of a small machine equipped with the conventional rotating electric machine stator winding of FIG. FIG. 11 is a side view of FIG. 10,
FIG. 12 is a front view showing a lead wire structure in an air passage of another example of a conventional stator winding of a rotating electric machine, and FIG. 13 shows a state in which the bus side and the neutral point side in FIG. 12 are exchanged. Front view, FIG. 14 is a front view showing the lead wire structure in the wind path of still another example of the stator winding of the conventional rotary electric machine, and FIG. 15 is a diagram showing the bus side and the neutral point side in FIG. It is a front view showing the state where it was replaced. 1 ... stator frame, 7 ... busbar side lead wire, 8 ... neutral point side lead wire, 13, 13A, 13B, 13C, 13D, 13E, 13F, 13G ... connection conductor, 15 ... stator Wire loop, 16 ... stator iron core.

Claims (1)

(57) [Claims] 1. A three-phase star-connected stator wire housed in a stator core supported by a stator frame, wherein the star-connected stator wire buses of each phase are provided. The side wire loop end and the neutral point wire loop end are respectively connected to a busbar terminal and a neutral point side terminal provided on the wind path outer peripheral wall arranged outside the stator frame via a lead wire, and In each of the stator windings of the phase, in a rotating machine stator winding in which the busbar side wire end and the neutral point side wire end are formed so as to be exchangeably connectable to the terminal, A part of the lead wire that is drawn out and connects the end of the wire loop and the terminal is provided so as to be crawled in the stator frame, and a connection exchange part is provided in a portion of the lead wire crawling in the stator frame. Is provided, and the end of the bus-side wire ring and the neutral point-side wire end are replaced by using a wire prepared in advance at this replacement portion. A stator winding for a rotating electric machine characterized by being formed as described above.