CN210577974U

CN210577974U - High-starting-performance generator stator

Info

Publication number: CN210577974U
Application number: CN201921539187.7U
Authority: CN
Inventors: 赵建华; 王明; 朱明�; 张旭旭
Original assignee: Zhenjiang Zhongchuan Xiandai Generating Equipment Co ltd
Current assignee: Zhenjiang Zhongchuan Xiandai Generating Equipment Co ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-05-19
Anticipated expiration: 2029-09-17

Abstract

The utility model discloses a high starting performance generator stator, the stator slot width Wb at the bottom of the stator slot of the stator core is larger than the stator wedge width Wk at the slot part of the stator, and the stator slot width W0 is smaller than the stator wedge width Wk; the coil of the stator coil winding is divided into an upper layer and a lower layer which are embedded in the stator slot, and the coil is sealed by an insulation slot wedge embedded in the wedge opening of the stator. Ratio of stator slot height H to stator slot width Wb: H/Wb = 1.4-2.0. The utility model discloses a 2.4 ~ 3.0 times that starting ability improves current generator, and the pitch is than reducing to 2/3 from 5/6 of current generator, and stator core's length is 60~70% of current generator stator core length, and stator core's consumptive material volume only is 60~70% of current generator, and the copper consumption volume only is current generator 35~45%, the utility model discloses reduce and make generator cost reduce about 30%, economic benefits is showing, has spreading value.

Description

High-starting-performance generator stator

Technical Field

The utility model relates to a generator stator, especially a generator stator of direct start certain power motor belongs to generator technical field.

Background

In the special field of nuclear power or other generator applications, the generator is required to have the capability of directly starting a motor with certain power, and the existing generator can only safely and directly start the motor with the 1/6 rated capacity. When the generator is selected, the power of the direct starting motor is generally selected to be more than 6 times, the generator has larger power margin, is commonly called as a big horse-drawn trolley, and is not economical to use. Although the capacity of the generator is simply increased to solve the problem of pressure drop when the motor is directly started, the generator has large capacity, large external dimension and large floor area, so that field installation conditions are difficult to meet sometimes, and the acquisition cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high startability generator stator reduces the generator capacity of chooseing for use to reduce the acquisition cost of generator.

The utility model discloses a following technical scheme realizes:

a high-starting-performance generator stator is characterized in that a stator core is annular, a plurality of stator slots with central lines perpendicular to the axis of an annular ring are uniformly distributed on the edge of the inner circle of the annular ring, the stator slots are wedge-shaped with large slots at the bottom and small slots, the width Wb of the stator slot at the bottom of each stator slot is larger than the width Wk of each stator wedge, and the width W0 of the stator slot penetrating through the edge of the inner circle of the stator core is smaller than the width Wk of each stator wedge; the coil of the stator coil winding is divided into an upper layer and a lower layer which are embedded in the stator slot, and the coil is sealed by an insulation slot wedge embedded in a stator wedge opening; the slot bottom of the stator slot is semicircular, and the ratio of the height H of the stator slot to the width Wb of the stator slot is as follows: H/Wb = 1.4-2.0.

The object of the invention is further achieved by the following technical measures.

Further, the ratio of the distance pitch y between the two effective sides of one coil and the inner circle of the stator core to the pole distance τ of the number of the stator slots occupied by each magnetic pole along the inner circle of the stator core, namely, the pitch ratio: y/τ = 2/3.

Further, the length of the stator core is 60% -70% of the length of the existing generator stator core. The stator core is an integral annular structure formed by laminating a plurality of stator punching sheets.

The utility model discloses a ratio H Wb of stator slot height H and stator slot width Wb is 1.4 ~ 2.0's structure, only 35~45% of the H Wb of current generator, generator transient reactance parameter X'd has been reduced, the starting capability of generator has been improved, the direct start ability that makes the generator can only start its capacity 1/6 rated load's motor from current generator, improve to the motor that can start its capacity 1/2.5 ~ 1/2 rated load, the starting capability improves 2.4 ~ 3.0 times of current generator. The utility model discloses a pitch ratio is reduced to 2/3 from 5/6 of current generator, and the pitch reduces and can arouse the increase of stator magnetic density value, and the increase of stator yoke magnetic density can be offset in the reduction of stator slot height H. The length of the stator core is 60-70% of the length of the existing generator stator core, and the ventilating pieces which are arranged between the stator core groups at intervals and have complex structures are omitted. The number of the wound coils of each turn of the stator coil winding is reduced, and the sectional area of each turn of the stator coil winding is 35-45% of that of each turn of the existing generator stator. Under the combined action of above-mentioned technical measure, the utility model discloses a stator core's consumptive material volume only is 60~70% of current generator, and stator coil winding's copper consumption volume only is current generator 35~45%, has shortened generator length, has alleviateed generator weight to make generator cost reduction about 30%, economic benefits is showing, has spreading value.

The advantages and features of the invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Drawings

Fig. 1 is a partial top view of the present invention;

3 FIG. 3 2 3 is 3 a 3 sectional 3 view 3 A 3- 3 A 3; 3

Fig. 3 is an enlarged view of a portion i of fig. 2.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 1 to fig. 3, the present embodiment is a stator structure of a certain type of generator, a stator core 1 of the stator structure is circular, 72 stator slots 11 whose central lines are perpendicular to an axis of the circular ring are uniformly distributed at an inner circular edge of the circular ring, the stator slots 11 are in a wedge shape with a large bottom and a small notch, a stator slot width Wb at the bottom of the stator slots 11 is greater than a stator wedge width Wk, and a stator slot width W0 penetrating through the inner circular edge of the stator core 1 is less than the stator wedge width Wk.

The coil 21 of the stator coil winding 2 is divided into an upper layer and a lower layer to be embedded in the stator slot 11, and the coil 21 is sealed by the insulation slot wedge 3 embedded in the wedge opening of the stator to be prevented from falling out of the stator slot 11. The slot bottom of the stator slot 11 is semicircular, which is more beneficial to protecting the insulation protection layer of the coil 21, improving the qualified rate of coil 21 inserting, reducing rework and reducing the processing cost. Ratio of stator slot height H to stator slot width Wb: H/Wb = 1.4-2.0, the starting capability of the generator is improved, and the starting capability is improved to 2.4-3.0 times of that of the existing generator.

The ratio of the pitch y of the distance between the two effective sides of one coil 21 across the inner circle of the stator core 1 to the pole pitch τ of the number of stator slots occupied by each magnetic pole along the inner circle of the stator core 1, i.e., the pitch ratio: y/tau =2/3, compare with the pitch ratio of current generator, the utility model discloses a pitch ratio has reduced 1/6 than current generator, can offset the increase of stator yoke magnetic density through reducing stator slot height H, simultaneously, has reduced the duplex winding root of every turn of stator coil winding 2, has reduced stator coil winding 2's copper consumption volume. The length L of the stator core 1 is 60-70% of the length of the existing generator stator core, the length of the generator is shortened, the weight of the generator is reduced, and therefore the cost of the generator is reduced by about 30%.

In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A high starting performance generator stator, the stator core is ring-shaped, the inner circle edge of the ring shape is evenly distributed with a plurality of stator slots with central lines vertical to the axis of the ring, the stator slots are wedge-shaped with a large slot opening at the bottom, the stator slot width Wb at the bottom of the stator slot is larger than the stator wedge opening width Wk at the slot opening part of the stator, and the stator slot opening width W0 penetrating through the inner circle edge of the stator core is smaller than the stator wedge opening width Wk; the coil of the stator coil winding is divided into an upper layer and a lower layer which are embedded in the stator slot, and the coil is sealed by an insulation slot wedge embedded in a stator wedge opening; the stator is characterized in that the groove bottom of the stator groove is semicircular, and the ratio of the height H of the stator groove to the width Wb of the stator groove is as follows: H/Wb = 1.4-2.0.

2. The high startability generator stator according to claim 1, wherein: the ratio of the distance pitch y of the stator core inner circle spanned by the two effective sides of one coil to the pole distance tau of the number of the stator slots occupied by each magnetic pole along the stator core inner circle, namely the pitch ratio: y/τ = 2/3.

3. The high startability generator stator according to claim 1, wherein: the length of the stator core is 60-70% of the length of the existing generator stator core.

4. The high startability generator stator according to claim 1, wherein: the stator core is an integral annular structure formed by laminating a plurality of stator punching sheets.