CN216436909U

CN216436909U - Anti-demagnetization permanent magnet motor punching sheet

Info

Publication number: CN216436909U
Application number: CN202122441627.9U
Authority: CN
Inventors: 李文成; 鲁方春; 尚键
Original assignee: Beijing Mingcheng Technology Development Co ltd; Anhui Mingteng Permanent Magnetic Machinery & Electrical Equipment Co ltd
Current assignee: Beijing Mingcheng Technology Development Co ltd; Anhui Mingteng Permanent Magnetic Machinery & Electrical Equipment Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-05-03
Anticipated expiration: 2031-10-11

Abstract

The utility model belongs to the permanent-magnet machine field, including the stator punching sheet that is equipped with stator winding and the rotor punching sheet that is equipped with the magnet steel groove, the magnet steel groove is equipped with the location step, the setting of location step is close to one side of rotor outer fringe at the magnet steel groove, concretely relates to prevent permanent-magnet machine punching sheet that moves back magnetism, it is through being close to the setting of rotor surface with magnet steel groove location step, promote the anti demagnetization ability of motor, thereby reduce the practical cost of magnet steel, be close to the length and the angle of the magnetic bridge of rotor surface through changing the magnet steel, preferred angle is the obtuse angle, through the adjustment to this structure, reduce back electromotive force's sine, reduce the harmonic, and then reduce motor vibration and noise.

Description

Anti-demagnetization permanent magnet motor punching sheet

Technical Field

The utility model belongs to the permanent-magnet machine field, concretely relates to prevent permanent-magnet machine towards piece of demagnetization.

Background

With the further application of the built-in magnetic steel permanent magnet motor in the fields of industrial control and the like, more rigorous requirements are put forward on performance indexes such as cogging torque, ripple torque, torque density, vibration noise, dynamic response and the like of the permanent magnet motor. Due to the principle characteristics of the permanent magnet motor, the permanent magnet motor has cogging torque which is not existed in the induction motor and larger ripple torque, however, the permanent magnet motor has the problems of excessive vibration noise, reduced operation efficiency and the like.

The existing built-in rotor structure is shown in fig. 4, and comprises a rotor punching sheet 10, a second magnetic steel groove 30 and a second positioning step 31, wherein the second magnetic steel groove 30 is symmetrically distributed along the center line of the rotor, the magnetic steel is positioned by the second positioning step 31 close to the inner circle of the rotor, the position of the second positioning step 31 is close to the inner side of the rotor, and the magnetic steel is limited in the second magnetic steel groove 30; the magnetic steel with the structure has weaker demagnetization resistance, and the counter electromotive force harmonic waves and the cogging torque are larger.

Disclosure of Invention

The utility model aims at overcoming above-mentioned prior art not enough, providing a permanent-magnet machine towards piece of demagnetization is prevented to rational in infrastructure, it is through being close to the setting of rotor surface with magnet steel groove location step, promotes the anti demagnetization ability of motor to reduce the practical cost of magnet steel.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a prevent permanent-magnet machine towards piece that demagnetizes, is including the stator towards piece that is equipped with stator winding and the rotor towards piece that is equipped with the magnet steel groove, the magnet steel groove is equipped with the location step, and the location step setting is close to one side of rotor outer fringe at the magnet steel groove.

Preferably, the end part of the magnetic steel groove is also provided with a magnetic bridge, and one side of the magnetic bridge close to the outer edge of the rotor adopts an arc line structure.

Preferably, the magnetic bridge comprises a first arc line and a second arc line, and an included angle between the first arc line and the second arc line is an obtuse angle and the included angle is towards the outer side of the rotor sheet.

Preferably, the magnetic steel grooves comprise first magnetic steel grooves and second magnetic steel grooves, the first magnetic steel grooves are symmetrically arranged along the central line of the rotor sheet to form a structure shaped like a Chinese character 'yi', and the second magnetic steel grooves are symmetrically arranged to form a structure shaped like a Chinese character 'V'.

Preferably, the two second magnetic steel grooves are connected through a connecting rib to form a linear structure, and the two linear structures are symmetrically arranged along the central line of the rotor punching sheet to form a V-shaped structure.

Preferably, the connecting rib adopts a convex structure.

Preferably, one end of the first magnetic steel groove close to the outer edge of the rotor is provided with a first positioning step, and one end of the second magnetic steel groove close to the outer edge of the rotor is provided with a second positioning step.

The beneficial effects of the utility model reside in that:

1) the anti-demagnetization capacity of the motor is improved by arranging the magnetic steel groove limiting boss close to the outer surface of the rotor, so that the practical cost of the magnetic steel is reduced.

2) Through the length and the angle that change magnet steel and be close to the magnetic bridge of rotor surface, preferred angle is the obtuse angle, through the adjustment to this structure, reduces back electromotive force's sine degree, reduces the harmonic, and then reduces motor vibration and noise.

Drawings

FIG. 1 is a schematic view of a stator and rotor assembly;

FIG. 2 is a schematic structural view of a rotor sheet;

FIG. 3 is an enlarged schematic view of A;

FIG. 4 is a schematic structural diagram of a conventional rotor sheet;

fig. 5 is a demagnetization cloud picture of magnetic steel of a motor rotor.

The utility model discloses each reference numeral is as follows with the actual corresponding relation of part name:

10. rotor punching sheets; 20. a first magnetic steel slot; 21. a first positioning step; 30. a second magnetic steel slot; 31. a second positioning step; 32. a magnetic bridge; 321. a first arc line; 322. a second arc; 33. connecting ribs; 40. stator punching sheets; 41. and a stator winding.

Detailed Description

For ease of understanding, the specific structure and operation of the present invention will be further described herein with reference to fig. 1-5:

the specific structure of the utility model is shown in fig. 1-5, including rotor punching 10 and stator punching 40, the ratio of rotor punching 10 external diameter and stator punching 40 external diameter is 0.6-0.7, both looks adaptations. The stator punching sheet 40 is provided with stator windings 41, and the stator windings 41 are arranged on the stator punching sheet 40 along the circumference at equal intervals.

The middle of the rotor punching sheet 10 is provided with a shaft hole, a plurality of magnetic steel grooves used for mounting permanent magnets are arranged at the position, close to the outer edge, of the rotor punching sheet 10, the outer edge of the rotor punching sheet 10 is formed by connecting a plurality of sections of circular arcs, the circle center of each circular arc deviates from the center of the shaft hole, the structure is simple, non-uniform air gaps are formed between the rotor punching sheet 10 and the stator punching sheet 40, the waveform of counter electromotive force is effectively improved, and tooth space torque is reduced.

The magnetic steel grooves are V + I-shaped, and the two first magnetic steel grooves 20 are symmetrically arranged to form a I-shaped structure. The two second magnetic steel grooves 30 are connected end to form a linear structure, and the two linear structures are symmetrically arranged to form a V-shaped structure. The two are matched to form a V + I-shaped structure. The V + I-shaped iron core has high utilization rate, and the arc structure is favorable for reducing the air gap flux density harmonic content and reducing the vibration and noise of the motor.

Connecting ribs 33 are arranged between the straight-line-shaped structures formed by the second magnetic steel grooves 30, and the arrangement of the connecting ribs 33 reduces the centrifugal force when the rotor core rotates, so that the deformation caused by the centrifugal force when the rotor core rotates is reduced.

One side of the first magnetic steel groove 20 close to the outer edge of the rotor sheet 10 is provided with a first positioning step 21. One side of the second magnetic steel groove 30 close to the outer edge of the rotor sheet 10 is provided with a second positioning step 31. Through being close to the setting of rotor surface with the spacing boss in magnet steel groove, promote the anti demagnetization ability of motor to reduce the practical cost of magnet steel. The magnetic steel limiting is beneficial to improving the demagnetization resistance of the motor, and as shown in figure 5, under the impact of three-phase pure short-circuit current, the demagnetization resistance of the magnetic steel is 0.14T at least

The magnetic bridge 32 part of the magnetic steel slot is composed of a first arc line 321 and a second arc line 322, and an included angle between the first arc line 321 and the second arc line 322 is an obtuse angle and the obtuse angle faces the outer side of the rotor punching sheet 10. Through changing the length and the angle that magnet steel is close to the magnetic bridge of rotor surface, preferred angle is the obtuse angle, through the adjustment to this structure, reduces back electromotive force's sine degree, reduces the harmonic, and then reduces motor vibration and noise.

Example 2

As a further improvement of the present application, a circular hole may be further disposed between the "V" shaped structure and the "one" shaped structure, and by changing the position and angle of the hole, the angle of the two circular holes is 80deg, and the radius of the circular hole is 3mm in this embodiment; the electromagnetic vibration and the noise of the motor can be greatly reduced.

It will of course be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. The utility model provides a prevent permanent-magnet machine towards piece that demagnetizes, is including stator towards piece (40) that is equipped with stator winding (41) and rotor towards piece (10) that is equipped with the magnetic steel groove, its characterized in that, the magnetic steel groove is equipped with the location step, and the location step sets up in the magnetic steel groove one side that is close to the rotor outer fringe.

2. The anti-demagnetization permanent magnet motor punching sheet according to claim 1, wherein a magnetic bridge (32) is further arranged at the end of the magnetic steel slot, and one side, close to the outer edge of the rotor, of the magnetic bridge (32) adopts an arc structure.

3. The anti-demagnetization permanent magnet motor punching sheet according to claim 2, wherein the magnetic bridge (32) comprises a first arc line (321) and a second arc line (322), and an included angle between the first arc line (321) and the second arc line (322) is an obtuse angle and the obtuse angle faces the outer side of the rotor punching sheet (10).

4. The anti-demagnetization permanent magnet motor punching sheet according to any one of claims 1 to 3, wherein the magnetic steel grooves comprise a first magnetic steel groove (20) and a second magnetic steel groove (30), two first magnetic steel grooves (20) are symmetrically arranged along the center line of the rotor punching sheet (10) to form a straight structure, and four second magnetic steel grooves (30) are symmetrically arranged to form a V-shaped structure.

5. The anti-demagnetization permanent magnet motor punching sheet according to claim 4, wherein two second magnetic steel grooves (30) are connected through a connecting rib (33) to form a linear structure, and the two linear structures are symmetrically arranged along the center line of the rotor punching sheet (10) to form a V-shaped structure.

6. The anti-demagnetization permanent magnet motor punching sheet according to claim 5, wherein the connecting rib (33) adopts a convex structure.

7. The anti-demagnetization permanent magnet motor punching sheet according to claim 4, wherein a first positioning step (21) is arranged at one end, close to the outer edge of the rotor, of the first magnetic steel groove (20), and a second positioning step (31) is arranged at one end, close to the outer edge of the rotor, of the second magnetic steel groove (30).