CN220692899U - Novel magnetic yoke wind-guiding piece - Google Patents

Abstract

The utility model discloses a novel magnetic yoke wind-guiding block, which belongs to the technical field of motors and is detachably connected with magnetic poles, wherein the lower end of the wind-guiding block is fixedly connected with a magnetic yoke section through a welding seam, a seam allowance structure for limiting the circumferential movement of the wind-guiding block is arranged between the wind-guiding block and the magnetic yoke section, and a ventilation ditch is formed between two adjacent wind-guiding blocks. According to the utility model, the spigot structure is arranged between the air guide block and the magnetic yoke section, and the spigot structure and the welding seam share the magnetic pole acting force together, so that the stress amplitude of the welding seam is reduced, and the risk brought to the unit by fatigue damage of the welding seam is effectively prevented.

Description

Novel magnetic yoke wind-guiding piece

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a novel magnetic yoke air guide block.

Background

The yoke is an important component of the rotor, is mechanically used for connecting the magnetic poles and the rotor support, bears centrifugal force and transmission torque when the magnetic poles are operated, and is electrically used as a part of a magnetic circuit of a main magnetic field. In order to meet the requirements of ventilation cooling of the motor during operation, the magnetic yoke is generally divided into a plurality of sections in the axial direction, ventilation grooves with a certain height are arranged between the sections, and cooling air can flow from the interelectrode space of the magnetic yoke. The provision of the ventilation grooves reduces the axial effective length of the yoke, thereby causing a series of problems:

(1) From a mechanical point of view, the yoke acts as a fixed part of the pole and is required to withstand the centrifugal forces of the rotor during operation. The reduction of the axial effective length of the magnetic yoke leads to a greater centrifugal force being applied per unit length of the bearing surface of the connection part of the magnetic yoke axial direction and the magnetic pole.

(2) From an electrical point of view, the yoke serves as a channel of the main magnetic field magnetic circuit, and in the case of a fixed magnetic flux, the contact area of the yoke and the magnetic pole determines the magnetic flux density of the root of the pole body. The reduction of the axial effective length of the yoke reduces the contact area of the yoke with the magnetic pole, thereby resulting in an increase in the pole body magnetic flux density. This exacerbates the risk of magnetic saturation.

At present, some units are provided, and an air guide block is welded on a magnetic yoke and is used for filling a ventilation slot at the joint of the magnetic yoke and a magnetic pole, so that the aim of increasing the axial magnetic conduction area of the magnetic yoke is fulfilled. However, the yoke of this structure still has the following drawbacks: because the wind guide block corresponding to each magnetic pole is segmented on the magnetic yoke, and in order to reserve the welding angle space of the wind guide block and the magnetic yoke, the edge of the wind guide block is not aligned with the stress surface of the installation groove (the installation groove is a T-shaped tail groove or a dove tail groove) for installing the magnetic pole on the magnetic yoke. Therefore, the wind guide block with the structure cannot bear the centrifugal force of the magnetic poles, and therefore, the stress of the mounting groove (the magnetic mounting groove is a T-shaped groove or a dove-tail groove) cannot be improved.

The Chinese patent with publication number of CN207426832U and publication date of 2018.05.29 discloses a motor magnetic yoke structure, wherein a connecting piece for limiting radial movement of a magnetic pole is fixedly arranged on the magnetic yoke, a limiting surface is arranged on the connecting piece, and the limiting surface and a stress surface of a mounting groove are positioned on the same plane. This patent has the following problems: the air guide block is directly welded with the magnetic yoke section, and only the weld joint directly bears the acting force of the magnetic pole on the air guide block. Because of the characteristics of high rotation speed, forward and reverse rotation, frequent starting and the like of the generator motor, the welding line of the air guide block has hidden danger of fatigue damage.

Disclosure of Invention

The utility model aims to solve the defects and shortcomings of the prior art, and provides a novel magnetic yoke air guide block. Through setting up tang structure between wind-guiding piece and yoke section, sharing magnetic pole effort jointly by tang structure and welding seam, reduce welding seam stress amplitude, effectively prevent the risk that the welding seam fatigue damage brought for the unit.

The utility model is realized by the following technical scheme:

novel yoke wind-guiding piece, wind-guiding piece and magnetic pole detachable connection, wind-guiding piece lower extreme pass through welding seam and yoke section fixed connection, be provided with the tang structure that is used for limiting wind-guiding piece circumferential motion between wind-guiding piece and the yoke section, form the ventilation ditch between two adjacent wind-guiding pieces.

Preferably, the air guide block is provided with a mounting groove, and the magnetic pole is provided with a mounting block matched with the mounting groove.

Preferably, the air guide block is provided with a mounting block, and the magnetic pole is provided with a mounting groove matched with the mounting block.

Preferably, the air guide block is provided with a concave hole, the magnetic yoke section is provided with a boss, and the concave hole and the boss form a spigot structure.

Preferably, the air guide block is provided with a boss, the magnetic yoke section is provided with a concave hole, and the concave hole and the boss form a spigot structure.

Preferably, a plurality of spigot structures are arranged between the air guide block and the magnetic yoke section.

Preferably, the plurality of spigot structures are uniformly arranged on the air guide block and the magnetic yoke section.

Preferably, the air guide block is provided with a through hole, and the through hole is of a hollow structure.

Compared with the prior art, the utility model has the following advantages:

1. according to the novel magnetic yoke air guide block provided by the utility model, the spigot structure is arranged between the air guide block and the magnetic yoke section, and the spigot structure and the welding seam share the magnetic pole acting force together, so that the stress amplitude of the welding seam is reduced, and the risk brought to a unit by fatigue damage of the welding seam is effectively prevented.

2. The novel magnetic yoke wind-guiding block provided by the utility model has the advantages that the concave holes and the bosses form the spigot structure, the structural implementation is simple, and the intrinsic safety of the rotor is effectively improved.

3. According to the novel magnetic yoke air guide block, the strength of the air guide block is not reduced by the through holes with the hollow structures, and the weight of the air guide block can be reduced and the production cost can be saved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of the air guiding block, magnetic pole and yoke section according to the present utility model;

FIG. 3 is a cross-sectional view at A-A in FIG. 2;

FIG. 4 is a schematic structural view of embodiment 2 of the present utility model;

FIG. 5 is a cross-sectional view at B-B in FIG. 4;

wherein: 100. an air guide block; 101. a through hole; 200. a magnetic pole; 300. a yoke section; 400. welding seams; 500. a spigot structure; 501. concave holes; 502. a boss; 600. and a ventilation ditch.

Detailed Description

The present utility model will be described in further detail with reference to examples, but embodiments of the present utility model are not limited thereto.

Example 1

As shown in fig. 1-3, this embodiment provides a novel magnetic yoke wind-guiding block, the wind-guiding block 100 is detachably connected with the magnetic pole 200, the lower end of the wind-guiding block 100 is fixedly connected with the magnetic yoke section 300 through the welding seam 400, a spigot structure 500 for limiting the circumferential movement of the wind-guiding block 100 is arranged between the wind-guiding block 100 and the magnetic yoke section 300, and a ventilation groove 600 is formed between two adjacent wind-guiding blocks 100. The spigot structure 500 is arranged between the air guide block 100 and the magnetic yoke section 300, the acting force of the magnetic pole 200 is shared by the spigot structure 500 and the welding seam 400, the stress amplitude of the welding seam 400 is reduced, and the risk of the unit caused by fatigue damage of the welding seam 400 is effectively prevented.

Wherein, the air guiding block 100 is provided with a mounting groove, and the magnetic pole 200 is provided with a mounting block matched with the mounting groove.

Wherein, set up boss 502 on the air guide block 100, set up shrinkage pool 501 on the yoke section 300, shrinkage pool 501 and boss 502 constitute tang structure 500.

Wherein, a plurality of spigot structures 500 are arranged between the air guide block 100 and the yoke section 300.

The plurality of spigot structures 500 are uniformly disposed on the air guide block 100 and the yoke segment 300.

Example 2

As shown in fig. 4 and 5, this embodiment is different from embodiment 1 in that a mounting block is provided on the air guiding block 100, and a mounting groove matched with the mounting block is provided on the magnetic pole 200.

Wherein, set up shrinkage pool 501 on the air guide block 100, set up boss 502 on the yoke section 300, shrinkage pool 501 and boss 502 constitute tang structure 500. The concave holes 501 and the bosses 502 form the spigot structure 500, the structure is simple to implement, and the intrinsic safety of the rotor is effectively improved.

The air guide block 100 is provided with a through hole 101, and the through hole 101 is in a hollow structure. The through holes 101 with the hollow structures can not reduce the strength of the air guide block 100, but also reduce the weight of the air guide block 100 and save the production cost.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.

Claims (8)

1. Novel magnetic yoke wind-guiding piece, wind-guiding piece (100) can dismantle with magnetic pole (200) and be connected, and wind-guiding piece (100) lower extreme passes through welding seam (400) and magnetic yoke section (300) fixed connection, its characterized in that: a spigot structure (500) used for limiting circumferential movement of the wind guide blocks (100) is arranged between the wind guide blocks (100) and the magnetic yoke section (300), and a ventilation groove (600) is formed between two adjacent wind guide blocks (100).

2. The novel magnetic yoke wind-guiding block of claim 1, wherein: the air guide block (100) is provided with a mounting groove, and the magnetic pole (200) is provided with a mounting block matched with the mounting groove.

3. The novel magnetic yoke wind-guiding block of claim 1, wherein: the air guide block (100) is provided with a mounting block, and the magnetic pole (200) is provided with a mounting groove matched with the mounting block.

4. The novel magnetic yoke wind-guiding block of claim 1, wherein: concave holes (501) are formed in the air guide block (100), bosses (502) are formed in the magnetic yoke section (300), and the concave holes (501) and the bosses (502) form a spigot structure (500).

5. The novel magnetic yoke wind-guiding block of claim 1, wherein: set up boss (502) on air guide block (100), set up shrinkage pool (501) on yoke section (300), shrinkage pool (501) and boss (502) constitute tang structure (500).

6. The novel magnetic yoke wind-guiding block of claim 1, wherein: a plurality of spigot structures (500) are arranged between the air guide block (100) and the magnetic yoke section (300).

7. The novel yoke wind-guiding block of claim 6, wherein: the plurality of spigot structures (500) are uniformly arranged on the air guide block (100) and the magnetic yoke section (300).

8. The novel magnetic yoke wind-guiding block of claim 1, wherein: the air guide block (100) is provided with a through hole (101), and the through hole (101) is of a hollow structure.