CN108599422B

CN108599422B - Rotor core structure and compressor

Info

Publication number: CN108599422B
Application number: CN201810778171.5A
Authority: CN
Inventors: 张继胤; 龙芳; 李尚平; 张斌骥; 龚海涛; 刘贤义; 余业甲; 萧晓森; 范清姗
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-07-16
Filing date: 2018-07-16
Publication date: 2020-04-10
Anticipated expiration: 2038-07-16
Also published as: CN108599422A

Abstract

The utility model provides a rotor core structure and compressor, this rotor core structure includes rotor core and a plurality of magnetism steel bay of establishing on rotor core, still including establishing magnet steel bay around at least one expansion tank with separate the magnetism steel bay with the splice bar in expansion tank, the splice bar can take place to warp under the exogenic action. When the motor rotates at a high speed, air in the expansion groove is heated, so that the connecting ribs are deformed, the magnetic steel groove is clamped tightly, the effect that the magnetic steel cannot deviate is achieved, vibration noise is reduced, the probability of demagnetization of the motor is reduced, and safety performance is improved.

Description

Rotor core structure and compressor

Technical Field

The invention relates to the field of compressors, in particular to a rotor core structure and a compressor.

Background

In the field of variable frequency compressor motors, permanent magnet synchronous motors are generally adopted, and the V-shaped magnetic steel structure of the existing permanent magnet synchronous motor is high in energy efficiency and widely used by the industry. However, when the rotating speed of the motor is high, the magnetic steel can be radially offset in the magnetic steel groove, so that high vibration noise is generated, the product quality is affected, high potential safety hazards exist, and the demagnetization probability of the motor is increased.

In the field, a rotor core capable of preventing the magnetic steel from radially deviating in the magnetic steel slot is urgently designed.

Disclosure of Invention

The invention aims to provide a rotor core structure and a compressor, wherein the rotor core structure ensures that magnetic steel cannot deviate when a motor rotates at a high speed, vibration noise is reduced, and safety performance is improved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a rotor core structure, includes rotor core and a plurality of magnetic steel grooves of establishing on the iron core, its characterized in that: the magnetic steel tank is characterized by further comprising at least one expansion tank arranged around the magnetic steel tank and a connecting rib for separating the magnetic steel tank from the expansion tank, wherein the connecting rib can deform when bearing external force.

Preferably, the expansion slot is arranged on one side of the magnetic steel slot close to the center of the rotor core.

Preferably, the expansion groove is a through hole.

Preferably, the thickness of the connecting rib is uniform.

Preferably, the thickness of the connecting rib is 0.2-0.25 mm.

Preferably, the length of the connecting rib is less than 1/5 of the total length of the magnetic steel groove.

Preferably, the expansion groove is square or triangular.

Preferably, the magnetic steel slots are evenly distributed around the center of the rotor core.

The invention also protects a compressor comprising the rotor core structure.

Preferably, the compressor is an inverter compressor.

Compared with the prior art, the invention has at least the following beneficial effects:

according to the rotor core structure and the compressor, when the motor rotates at a high speed, air in the expansion groove can be heated, so that the connecting ribs are deformed, the magnetic steel groove is clamped tightly, the effect that the magnetic steel cannot deviate is achieved, vibration noise is reduced, the probability of demagnetization of the motor is reduced, and safety performance is improved.

Drawings

FIG. 1 is a perspective view of an embodiment;

FIG. 2 is a front view of an embodiment;

FIG. 3 is a front view of an embodiment;

FIG. 4 is a front view of an embodiment;

fig. 5 is a partially enlarged view of fig. 2.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Referring to fig. 1-2, a rotor core structure provided for an embodiment includes a rotor core 1 and a magnetic steel slot 2, the magnetic steel slot 2 is uniformly distributed around a center of the rotor core for mounting magnetic steel, the magnetic steel slot is further provided with a plurality of expansion slots 3, the number of the expansion slots 3 is determined according to circumstances, the expansion slots 3 are arranged on one side of the magnetic steel slot facing to an axis of the rotor core, and a connection rib 4 is arranged between the expansion slots 3 and the magnetic steel slot 2. This rotor core structure matched with heating rod inserts rotor core in the hole in the middle of the rotor, high temperature heating, the temperature that makes rotor core constantly risees, rotor core thermal expansion, make the downthehole gas of inflation also can thermal expansion, thereby make splice bar 4 receive the bulging force and warp to the magnet steel groove, the fixed magnet steel of splice bar of deformation, make the rotor at high-speed operation in-process, the skew can not take place for the magnet steel, the noise that the vibration sent has been reduced, the probability of motor demagnetization has also been reduced, its security performance has still been improved simultaneously.

In the present embodiment, the expansion slots 3 are through-hole structures that penetrate both end faces of the rotor core. Wherein, after heating, the deformation of the connecting rib is more uniform, the thickness of the connecting rib 4 is uniformly set, the thickness of the connecting rib is set between 0.2mm and 0.25mm, if the thickness of the connecting rib is too large, the deformation degree of the expansion hole is too small, and the fixing effect on the magnetic steel groove is not good. In order to prevent the connecting rib from being broken due to excessive deformation, the length of the connecting rib is set to be 1/5 which is smaller than the length of the magnetic steel groove.

In other embodiments, the shape of the expansion tank 3 may be square, triangular, or polygonal, or may be some other shape, but all of them can achieve the above-mentioned effects.

The invention also protects a compressor which is a variable frequency compressor and adopts a rotor core structure with expansion slots and connecting ribs, thereby reducing the noise of the motor, reducing the probability of demagnetization of the motor and improving the safety performance of equipment.

The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for the purpose of helping those skilled in the art understand the present invention, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art in light of the above teachings are intended to be included within the scope of the present invention.

Claims

1. A rotor core structure comprises a rotor core (1) and a plurality of magnetic steel slots (2) arranged on the rotor core, and is characterized in that,

further comprising: at least one expansion groove (3) arranged around the magnetic steel groove (2), and a connecting rib (4) for separating the magnetic steel groove and the expansion groove (3); a heating rod disposed in the rotor core (1);

the expansion groove (3) is arranged on one side of the magnetic steel groove close to the center of the rotor core; the connecting ribs (4) can deform when bearing external force;

the heating rod enables the temperature of the rotor iron core to rise, so that gas in the expansion groove is heated and expanded, the connecting rib (4) is subjected to expansion force which deforms towards the magnetic steel groove, and the magnetic steel is limited to deviate in the high-speed operation process of the rotor.

2. The rotor core structure of claim 1, wherein: the expansion groove (3) is a through hole.

3. The rotor core structure of claim 1, wherein: the thickness of the connecting ribs (4) is uniform.

4. The rotor core structure of claim 3, wherein: the thickness of the connecting ribs (4) is 0.2-0.25 mm.

5. The rotor core structure of claim 1, wherein: the length of the connecting rib (4) is less than 1/5 of the total length of the magnetic steel slot.

6. The rotor core structure of claim 1, wherein: the expansion groove (3) is square or triangular.

7. The rotor core structure of claim 1, wherein: the magnetic steel grooves (2) are uniformly distributed around the circle center of the rotor core (1).

8. A compressor, comprising a rotor core structure, characterized in that: the rotor core structure of any one of claims 1-7.

9. The compressor of claim 8, wherein: the compressor is a variable frequency compressor.