CN85200122U

CN85200122U - New structure of stator armature of large ac machine

Info

Publication number: CN85200122U
Application number: CN 85200122
Authority: CN
Inventors: 宋文谦
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1985-10-10

Abstract

The utility model relates to the new structure of a stator armature of a large alternating current machine, which belongs to the improvement on the structural technology of the large alternating current machine. The utility model is characterized in that when the transposition pattern of a winding bar is 0 DEG/540 DEG/0 DEG (not any transposition for the end of the winding bar), and the nose part at one end of the winding bar is connected as described in the method of the new structure, the additional loss of circulating current in a unit conducting wire can be reduced to the ideal transposition level of about 180 DEG/540 DEG/-180 DEG (See Figure 3, the figure for the connection of two winding bars at the nose parts).

Description

New structure of stator armature of large AC machine

The invention belongs to the improvement of large ac machines structure

As everyone knows, the stator bar of large ac machines, the unit lead (1) of (2) or (3) must be done the transposition of certain mode, is caused by leakage flux to reduce, and results from the circulating current supplementary load loss in the stator bar unit wire loop.The analysis showed that for the turbo generator of the two poles of the earth, rated power is 150,000 kilowatts, one of a circulating current supplementary load loss that end cross self-induction stray field causes just reaches 149.2 kilowatts; 500,000 kilowatts generator.These supplementary load loss are 163 kilowatts; 800,000 kilowatts generator, these supplementary load loss are 357 kilowatts.

The desirable transposition form of whole line rod is 180 °/540 °/-180 °, there are not the circulating current supplementary load loss, because of its formed loop of end unit lead is symmetrical at the two ends of iron core, not only can both offset in the unit lead that acts on slot part A and end B by the various stray fields that operating current produced, and the effect of passing the rotor leakage field of line stick end also can be offset.But the line rod of this transposition form, its end unit lead will be made opposite 180 ° of direction and reverse, be easy to damage wire insulation and cause quality accident, increased simultaneously technologic difficulty widely, especially for some four row leads the transposition line rod, all the more so, so the home and abroad is not seen as yet at present the report of using this transposition form.

Domestic large ac machines stator bar was only done transposition at slot part, and the end transposition was not also done, and the transposition line rod of four row's leads was not done yet.

Characteristics of the present invention are that the transposition form of whole line rod is that 0 °/540 °/0 ° of line stick end is not done the transposition of any way, and after only an end nose C of online rod connects by a method of the present invention and an other layer line are excellent, the low ideal transposition level that arrives near 180 °/540 °/-180 ° of circulating current supplementary load loss in the unit lead can be made, therefore efficiency of motor can be improved.Simultaneously, because line stick end of the present invention do not replace, makes easyly, saving has guaranteed quality to have reduced cost man-hour; The line bar structure is simple, only needs a kind of style, to not influence of the type of cooling, applicable to the line rod of any type of cooling, also comprises the transposition line rod of four row's leads.

Design of the present invention is that this new-type line bar structure is except the nose connection place, the transposition form of whole line rod unit lead is 0 °/540 °/0 °, promptly do not carry out any transposition in the end, by in the specific connection of nose, can slacken or eliminate the circulating current supplementary load loss that 0 °/540 °/0 ° only end cross self-induction stray field of transposition line rod causes.

Implementing method of the present invention is: the transposition form of whole line rod is 0 °/540 °/0 °, an end of line rod and common the same (left side among Fig. 2 and Fig. 3 is not shown).But online excellent other end nose connection place (the C section of Fig. 3) will be divided into four groups (Fig. 1) to all unit leads of a line rod by line rod short transverse equably, as unit lead winding (21), (22), (23), (24) of unit lead group (11), (12), (13), (14) and the line rod (3) of line rod (2).Like this, by Fig. 1 and Fig. 2 as seen, the electromotive force of in the unit lead, inducting by end cross self-induction stray field, electric potential direction in middle two groups of unit leads (12), (13) is identical, the electric potential direction of two of both sides groups of unit leads (11), (14) is also identical up and down, but the electric potential direction of (12), (13) and (11), (14) is opposite.Therefore, the rule that the nose of line rod one end connects must be, two groups of unit leads on the both sides up and down of middle two groups of unit leads and an other layer line rod link, and the electromotive force that only in this way could guarantee to circulate is cancelled each other.Two groups of unit leads in the middle of the wired rod, available insulating material wrapping together, for example unit lead group (12), (13) and (22), (23) or the like.And two groups of unit leads on wired excellent limit for example (11), (14) and (21), (24) or the like, also all to carefully wrap with insulating material respectively for every group, and to do bending circumferential and radially, so that they radially separate with two groups of unit leads of centre, after the connection, two connecting joints are arranged in diametric(al).

During making, wired rod is all made same pattern, when being unified into whole winding, will be 180 ° of half line rod upsets, two groups of unit leads link on the limit of two groups of unit leads and an other layer line rod (3) in the middle of the line rod (2) so that make, as (12) among Fig. 3, (13), (21), (24) and (11), (14), (22), (23).

At two connecting joints that nose (the C section of Fig. 3) forms, they are mutual insulating carefully.

The draw bail form that the present invention proposes concerning water-cooled line rod, also is feasible.

Fig. 1 is a self-induced e.m.f schematic diagram in unit, the nose cross section lead of line rod one end.

Fig. 2 is the self-induced e.m.f schematic diagram (Be is an end cross self-induced magnetic flux density) in the line stick end unit lead

Fig. 3 is that two line rods connect schematic diagram at nose.

Claims

A kind of large ac machines stator bar nose configurations, it is characterized in that replacing the line rod of 180 °/540 °/-180 ° of desirable transposition forms with 0 °/540 °/0 ° transposition line rod, all unit leads of line rod are divided into four groups equably, be the unit lead one-tenth (11) in Fig. 1 line rod (2), (12), (13), (14) and (21) in the line rod (3), (22), (23), (24), then, with two unit lead groups (12) in the middle of the line rod (2), (13) with in another groove lower bar (3) two unit lead groups (21) on both sides up and down, (24) link up formation nose (D ₁); Line rod (2) is linked up formation nose (D in middle two unit lead groups (22), (23) of two unit lead groups (11), (14) and line rod (3) on both sides up and down ₂).