CN212435454U - Rotor structure, motor and compressor - Google Patents

Abstract

The main object of the present invention is to provide a rotor structure, a motor and a compressor, wherein the rotor structure includes a rotor core and a plurality of permanent magnets disposed on the rotor core to form a plurality of magnetic poles on the rotor core, the plurality of magnetic poles include a plurality of N poles and a plurality of S poles alternately disposed along a circumferential direction of the rotor core; at least one magnetic pole of the rotor core is provided with a magnetic isolation hole, and the magnetic isolation hole comprises a main hole body and a branch hole; the projection of the branch hole on the predetermined plane is strip-shaped, and the central line of the extension direction of the branch hole is connected with the middle part of the main hole body. Through the utility model discloses an above-mentioned setting has solved the great problem of vibration noise of the motor among the prior art.

Description

Rotor structure, motor and compressor

Technical Field

The utility model relates to a motor field particularly, relates to a rotor structure, motor and compressor.

Background

In recent years, with the development of permanent magnet material manufacturing technology and the rapid reduction of cost, the permanent magnet motor has excellent performance and low price, the technical development of the permanent magnet motor is greatly promoted, the permanent magnet material resources are rich, and the technical research and development of the permanent magnet motor are promoted.

The permanent magnet motor generates a main magnetic field by a permanent magnet, and compared with a common induction motor, the permanent magnet synchronous motor does not need reactive exciting current, and the rotor resistance loss is zero in a synchronous running state. Therefore, the power factor is high and the efficiency is high, and the power factor can be used for replacing an induction motor with lower force energy index, the economic benefit and the social benefit are very obvious, and the power factor is widely applied to various industries.

However, the magnetic energy product of the permanent magnet material of the permanent magnet synchronous motor, the fixed mark and the permanent magnet of the material is not changed, the air gap magnetic field of the motor is difficult to adjust, the tooth space structure of the motor enables the air gap magnetic density and the counter electromotive force to have higher harmonic content, and the peak value of the electromagnetic force density of the motor is large, so that the torque pulsation and the vibration noise of the motor are larger.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a rotor structure, a motor and a compressor, which can solve the problem of the prior art that the vibration noise of the motor is large.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a rotor structure including a rotor core and a plurality of permanent magnets provided on the rotor core to form a plurality of magnetic poles on the rotor core, the plurality of magnetic poles including a plurality of N poles and a plurality of S poles alternately provided in a circumferential direction of the rotor core; at least one magnetic pole of the rotor core is provided with a magnetic isolation hole, and the magnetic isolation hole comprises a main hole body and a branch hole; the projection of the branch hole on the predetermined plane is strip-shaped, and the central line of the extension direction of the branch hole is connected with the middle part of the main hole body.

Further, the projection of the branch hole on the predetermined plane is perpendicular to the projection of the main hole body on the predetermined plane; and/or the projection of the main hole body on a predetermined plane extends along the radial direction of the rotor core or is parallel to the magnetic pole center line of the magnetic pole; and/or the branch hole is located at one side of the main hole body.

Furthermore, the main hole body comprises a first hole section and a second hole section which are arranged along the extending direction of the main hole body, the first hole section is positioned on one side of the branch hole, which is far away from the axis of the rotor core, and the second hole section is positioned on one side of the branch hole, which is close to the axis of the rotor core; the width of the first hole section is K, the width of the second hole section is M, and the maximum width of the magnetism isolating hole is L; wherein, L/(K + M) is more than or equal to 4.5 and more than or equal to 0.7, and the width directions of the first hole section, the second hole section and the magnetism isolating hole are all the directions which are vertical to the length direction of the magnetism isolating hole on the preset plane.

Furthermore, an included angle between the extending direction of the projection of the main hole body on the preset plane and the extending direction of the projection of the branch hole on the preset plane is C, and an included angle between the permanent magnets positioned on the two sides of the magnetic pole is D; wherein, 3.7 is more than or equal to C/D is more than or equal to 0.2.

Furthermore, the minimum distance between the main hole body and the permanent magnet positioned on one side of the magnetic pole is G, and the minimum distance between the branch hole and the permanent magnet positioned on one side of the magnetic pole is H; wherein, H/G is more than or equal to 3.2 and more than or equal to 0.2.

Furthermore, one end of the main hole body, which is close to the axis of the rotor core, faces the permanent magnet, and one end of the main hole body, which is far away from the axis of the rotor core, faces the outer peripheral surface of the rotor core; one end of the branch hole is connected with the middle part of the main hole body, and the other end of the branch hole is arranged towards the middle part of the permanent magnet.

Further, the permanent magnet has a first end face and a second end face in a direction close to the rotor core; on the preset plane, a straight line passing through one point of the branch hole, which is closest to the permanent magnet and is vertical to the permanent magnet is a preset straight line; the distance between the preset straight line and the first end face is A, and the distance between the preset straight line and the second end face is B; wherein, A/B is more than or equal to 1.5 and more than or equal to 0.4.

Further, along the direction far away from the rotor core, the main hole body is provided with a first side wall surface and a second side wall surface, and the branch hole is provided with a third side wall surface and a fourth side wall surface; the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E is more than or equal to F.

Further, along the direction far away from the rotor core, the main hole body is provided with a first side wall surface and a second side wall surface, and the branch hole is provided with a third side wall surface and a fourth side wall surface; the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E/F is more than or equal to 3.5 and more than or equal to 1.5.

Furthermore, the end face of one end of the main hole body, which is far away from the axis of the rotor core, is parallel to the peripheral surface of the rotor core, the distance is P, and the width of a motor air gap of the motor formed by the rotor structure is delta; wherein, 1.7 is more than or equal to P/delta is more than or equal to 0.4.

Furthermore, the branch hole and the permanent magnet which is positioned on the magnetic pole in sequence and is close to the branch hole are arranged in parallel, the minimum distance between the branch hole and the corresponding permanent magnet is Q, and the thickness of the permanent magnet is R; wherein Q/R is more than or equal to 3 and more than or equal to 1.2.

Furthermore, the branch hole is perpendicular to the permanent magnet which is positioned on one side of the magnetic pole and close to the branch hole, the minimum distance between the branch hole and the corresponding permanent magnet is S, and the thickness of the permanent magnet is R; wherein, 2.5 is more than or equal to S/R is more than or equal to 0.8.

Furthermore, each magnetic pole is provided with a plurality of magnetism isolating holes which are arranged in pairs; the two magnetism isolating holes in pairs are respectively positioned at two sides of the center line of the magnetic pole.

Furthermore, the projection of the main hole body on the preset plane is obliquely arranged relative to the magnetic pole center line of the magnetic pole, and the included angle between the projection of the main hole body on the preset plane and the magnetic pole center line is T, wherein T is less than or equal to 60 degrees.

Furthermore, the two paired magnetism isolating holes are respectively a first magnetism isolating hole and a second magnetism isolating hole, a main hole body of the first magnetism isolating hole and a main hole body of the second magnetism isolating hole are arranged in parallel, and branch holes of the first magnetism isolating hole and branch holes of the second magnetism isolating hole are arranged at intervals along the extending direction parallel to the main hole bodies of the first magnetism isolating hole and the second magnetism isolating hole.

Further, the distance between the branch hole of the first magnetism isolating hole and the branch hole of the second magnetism isolating hole along the extending direction of the main hole body of the first magnetism isolating hole and the main hole body of the second magnetism isolating hole is U, and the projection widths of the branch hole of the first magnetism isolating hole and the branch hole of the second magnetism isolating hole on the preset plane are both V; wherein, 2 is more than or equal to V/U is more than or equal to 0.5.

Furthermore, the two magnetic isolation holes in a pair are symmetrically arranged relative to the center line of the magnetic pole; or the branch holes of the two magnetism isolating holes in a pair are positioned on the same side of the corresponding main hole body.

According to a second aspect of the present invention, there is provided an electric machine, comprising a stator structure and a rotor structure, the rotor structure being the above-mentioned rotor structure.

According to a third aspect of the present invention, there is provided a compressor, comprising a motor, wherein the motor is the above-mentioned motor.

The utility model provides a rotor structure with rotor core, a plurality of permanent magnet and separate magnetic hole, wherein, a plurality of permanent magnets form a plurality of magnetic poles around rotor core' S axis evenly distributed on rotor core, including the N utmost point and the S utmost point, seted up on at least one magnetic pole and separated magnetic hole, wherein, separated magnetic hole includes the main hole body and branch hole. The plane perpendicular to the axis of the rotor core is used as a preset plane, the main hole body, the branch holes and the projection on the preset plane are both in a strip shape, the extending direction of the main hole body is arranged in a circumferential crossing mode with the rotor core, the central line of the extending direction of the branch holes is connected with the main hole body, and the branch holes are located at the position close to the middle of the main hole body, so that the width of the magnetism isolating holes in the circumferential direction and the radial direction of the rotor core is changed in a gradient mode, namely the size of the magnetism isolating holes in the radial direction and the size of the magnetism isolating holes in the circumferential direction of the rotor core are changed in a gradient mode, and meanwhile the size and the shape of the magnetism isolating holes in the axis direction of the rotor core are unchanged. Through the utility model provides a technical scheme has realized effectively improving motor magnetic circuit magnetic resistance distribution everywhere, improves the magnetic flow trend to adjust air gap magnetic field distribution, improve the dense wave form of air gap magnetism, reduce the tooth's socket effect of motor, reduce the back electromotive force harmonic of motor and account for than, reduce the torque ripple of motor, reduce the electromagnetic force density peak value of motor and reduce the technical effect of motor electromagnetic vibration noise, solved the great problem of vibration noise of the motor among the prior art.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a rotor structure according to a first embodiment of the invention;

FIG. 2 shows a schematic view of the magnetic flux profile of the rotor structure shown in FIG. 1;

fig. 3 shows a schematic structural view of a rotor structure according to a second embodiment of the invention;

fig. 4 shows a schematic structural view of a rotor structure according to a third embodiment of the invention;

fig. 5 shows a schematic structural view of a rotor structure according to a fourth embodiment of the invention;

fig. 6 shows a schematic structural view of a rotor structure according to a fifth embodiment of the present invention;

fig. 7 shows a schematic structural view of a rotor structure according to a sixth embodiment of the invention;

fig. 8 shows a schematic structural view of a rotor structure according to a seventh embodiment of the present invention;

FIG. 9 shows a graph comparing measured torque ripple of a prior art motor with a motor of the present application;

FIG. 10 shows a comparison of measured back emf harmonic ratios for a prior art motor versus a motor of the present application;

FIG. 11 is a graph comparing measured peak electromagnetic force densities for a prior art motor and a motor of the present application; and

fig. 12 shows a graph comparing the measured total noise values for a compressor with a prior art motor and a compressor with a motor of the present application.

Wherein the figures include the following reference numerals:

1. a rotor core; 2. a permanent magnet; 3. a magnetic pole; 31. a magnetic pole centerline; 4. a magnetism isolating hole; 41. a main bore body; 42. a branch hole; 5. a predetermined straight line; 6. a magnetic isolation bridge; 7. a magnetic conductive path; 71. a first path region; 72. a second path region; 73. a third path region.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 8, the present invention provides a rotor structure, which includes a rotor core 1 and a plurality of permanent magnets 2 disposed on the rotor core 1 to form a plurality of magnetic poles 3 on the rotor core 1, wherein the plurality of magnetic poles 3 include a plurality of N poles and a plurality of S poles alternately disposed along a circumferential direction of the rotor core 1; at least one magnetic pole 3 of the rotor core 1 is provided with a magnetism isolating hole 4, and the magnetism isolating hole 4 comprises a main hole body 41 and a branch hole 42; wherein, a plane perpendicular to the axis of the rotor core 1 is taken as a predetermined plane, the projection of the main hole body 41 on the predetermined plane is in a bar shape and is crossed with the circumferential direction of the rotor core 1 along the extending direction, the projection of the branch hole 42 on the predetermined plane is in a bar shape, and the central line of the extending direction is connected with the middle part of the main hole body 41.

The utility model provides a rotor structure with rotor core 1, a plurality of permanent magnet 2 and separate magnetic pore 4, wherein, a plurality of permanent magnet 2 form a plurality of magnetic poles 3 around rotor core 1' S axis evenly distributed on rotor core 1, including the N utmost point and the S utmost point, seted up on at least one magnetic pole 3 and separated magnetic pore 4, wherein, separated magnetic pore 4 includes the main hole body 41 and branch hole 42. Taking a plane perpendicular to the axis of the rotor core 1 as a predetermined plane, the main hole body 41, the branch holes 42 and the projection on the predetermined plane are both in a bar shape, the extending direction of the main hole body 41 is arranged to intersect with the circumferential direction of the rotor core 1, the center line of the extending direction of the branch holes 42 is connected with the main hole body 41, and the branch holes 42 are located at a position close to the middle of the main hole body 41, so that the widths of the magnetism isolating holes 4 in the circumferential direction and the radial direction of the rotor core 1 have gradient changes, that is, the sizes of the magnetism isolating holes 4 in the radial direction and the circumferential direction of the rotor core 1 have gradient changes, and meanwhile, the sizes and the shapes of the magnetism isolating holes 4 in the axial direction of the rotor core 1 are unchanged. Through the utility model provides a technical scheme has realized effectively improving motor magnetic circuit magnetic resistance distribution everywhere, improves the magnetic flow trend to adjust air gap magnetic field distribution, improve the dense wave form of air gap magnetism, reduce the tooth's socket effect of motor, reduce the back electromotive force harmonic of motor and account for than, reduce the torque ripple of motor, reduce the electromagnetic force density peak value of motor and reduce the technical effect of motor electromagnetic vibration noise, solved the great problem of vibration noise of the motor among the prior art.

Specifically, rotor core 1 is a material having strong magnetic permeability, which makes magnetic resistance of rotor core 1 small. Alternatively, the rotor core 1 is formed by stacking a plurality of silicon steel sheets, which allows magnetic lines of force to easily pass through. Because the magnetism isolating holes 4 are filled with air and other non-magnetic materials, the magnetic conductivity is poor, the magnetic resistance is large, and magnetic lines of force are not easy to pass through, the magnetism isolating holes 4 are formed, the magnetic resistance distribution of all parts of a magnetic circuit of the motor rotor structure can be changed, the trend of the magnetic lines of force in the rotor structure is changed, and the air gap flux density waveform is improved, so that the counter potential harmonic ratio is reduced, the motor torque pulsation is reduced, the electromagnetic force amplitude is reduced, and the electromagnetic vibration noise of the motor is reduced.

As shown in fig. 2, for the magnetic flux trend diagram of the rotor structure of the embodiment provided by the present invention, the lines with arrows are the marks of the magnetic lines, the solid lines with arrows indicate that more magnetic lines pass through the position, and the dotted lines with arrows indicate that less magnetic lines pass through the position. It is obvious from fig. 2 that the magnetic force lines pass through a small amount at the position of the magnetic isolation holes 4, and the magnetic isolation holes 4 provided by the utility model effectively improve the distribution of the magnetic force lines of the rotor structure.

Specifically, as shown in fig. 1 to 8, the projection of the branch hole 42 on the predetermined plane is perpendicular to the projection of the main hole body 41 on the predetermined plane; and/or the projection of the main aperture body 41 on a predetermined plane extends in the radial direction of the rotor core 1 or parallel to the magnetic pole center line 31 of the magnetic pole 3; and/or the branch hole 42 is located at one side of the main hole body 41.

The utility model provides a rotor structure, owing to adopted "the divine into" font structure separate magnetic hole 4, separate the existing main hole body 41 that extends along 1 radial direction of rotor core in magnetic hole 4, separate the trunk portion of magnetic hole 4 promptly, have the branch hole 42 that extends along rotor circumference direction again. The head of the branch hole 42 extends from the position of the main part of the magnetism isolating hole 4 close to the middle part to the direction far away from the main part of the magnetism isolating hole 4, the head of the branch hole 42 is communicated with the main part of the magnetism isolating hole 4, and the branch hole 42 is positioned on one side of the main part of the magnetism isolating hole 4, so that the shape of the magnetism isolating hole 4 is of a structure with two narrow ends and a wide middle part along the direction far away from the axis of the rotor core 1, and the widths of the magnetism isolating hole 4 along the circumferential direction and the radial direction of the rotor core 1 have gradient changes. Make rotor core's circumference magnetic resistance inequality everywhere, this and stator tooth's socket cooperation for magnetic circuit magnetic conductance everywhere is more even when the motor operation, and then has improved the air gap magnetic field distribution of motor, has reduced the air gap flux density wave form of motor, has reduced the torque ripple of motor, has reduced the back electromotive force harmonic of motor and has accounted for the ratio, and has reduced the electromagnetic force density peak value of motor and the vibration noise of motor.

As in the embodiment shown in fig. 1 to 7, in each magnetic pole 3, the head portions of the branch holes 42 of the two magnetism isolating holes 4 protrude from the position where the trunk portion of the magnetism isolating hole 4 is near the middle portion toward the direction near the permanent magnet 2.

In the embodiment shown in fig. 8, in the single magnetic pole 3, the head of the branch hole 42 of one magnetism isolating hole 4 protrudes from the position of the trunk of the magnetism isolating hole 4 near the middle part to the direction near the permanent magnet 2; the head of the branch hole 42 of the other magnetism isolating hole 4 extends from the position of the trunk of the magnetism isolating hole 4 near the middle part to the direction near the magnetic pole center line 31.

As shown in fig. 1, the main hole body 41 includes a first hole section and a second hole section that are provided along the extending direction of the main hole body 41, the first hole section being located on the side of the branch hole 42 away from the axis of the rotor core 1, the second hole section being located on the side of the branch hole 42 close to the axis of the rotor core 1; the width of the first hole section is K, the width of the second hole section is M, and the maximum width of the magnetism isolating hole 4 is L; wherein, L/(K + M) is more than or equal to 4.5 and more than or equal to 0.7, and the width directions of the first hole section, the second hole section and the magnetism isolating hole 4 are all the directions which are vertical to the length direction of the magnetism isolating hole 4 on the preset plane.

The width of the outer side of the magnetism isolating hole 4 (i.e., the end of the main hole body 41 close to the outer circumferential surface of the rotor core 1) in the circumferential direction of the rotor core 1 is K, the width of the inner side of the magnetism isolating hole 4 (i.e., the end of the main hole body 41 close to the axis of the rotor core 1) in the circumferential direction of the rotor core 1 is M, and the width of the middle of the magnetism isolating hole 4 in the circumferential direction of the rotor core 1 (i.e., the maximum width of the magnetism isolating hole 4) is L.

When the value of L/(K + M) sets up 0.7 to 4.5 within range, the centre that separates magnetic hole 4 is wide, both ends are narrow, the rotor structure is close to rotor core 1 outer peripheral face one side and is close to the magnetic circuit magnetic resistance of rotor core 1 axis one side less, the magnetic circuit magnetic resistance of separating 4 middle part position departments in magnetic hole is great, this makes the magnetic conductance of rotor core 1 radial direction more even, and then improved the air gap magnetic field distribution of motor, the air gap magnetism density harmonic ratio has been reduced, the electromagnetic force density peak value of motor and the vibration noise of motor have been reduced.

As shown in fig. 1, an included angle between an extending direction of a projection of the main hole body 41 on a predetermined plane and an extending direction of a projection of the branch hole 42 on the predetermined plane is C, and an included angle between the permanent magnets 2 located on both sides of the magnetic pole 3 is D; wherein, 3.7 is more than or equal to C/D is more than or equal to 0.2.

The projections of the main hole body 41 and the branch holes 42 on the predetermined plane are both strip-shaped, and a certain angle is formed between the extension directions of the main hole body 41 (i.e. the main part of the magnetism isolating hole 4) and the branch holes 42, and the angle is C; the angle between two permanent magnets 2 on one magnetic pole 3 is D.

When the C/D value is set within the range of 0.2 to 3.7, the magnetic flux density on the left side and the right side of the branch hole 42 can be adjusted, so that the sine degree of the magnetic flux density waveform in the circumferential direction of the air gap of the motor is higher, the harmonic wave is reduced, the torque pulsation of the motor is reduced, and the electromagnetic force density peak value of the motor and the vibration noise of the motor are reduced.

As shown in fig. 1, the minimum distance between the main hole body 41 and the permanent magnet 2 on the magnetic pole 3 side is G, and the minimum distance between the branch hole 42 and the permanent magnet 2 on the magnetic pole 3 side is H; wherein, H/G is more than or equal to 3.2 and more than or equal to 0.2.

A distance is reserved between one end of the main part (namely the main hole body 41) of the magnetism isolating hole 4 close to the permanent magnet 2 and the permanent magnet 2, and the minimum distance is G; the head end of the branch hole 42 is connected with the main hole body 41, and the tail end of the branch hole 42 is close to the permanent magnet 2 and has a distance with the permanent magnet, and the minimum distance is H.

When the value of H/G is set in the range of 0.2 to 3.2, the magnetic flux trend emitted from the permanent magnet 2 is guided by the main part and the branch hole 42 of the magnetism isolating hole 4 on the rotor core 1, and the magnetism isolating hole 4 with the structure can directly guide the magnetic flux trend from the inner side of the permanent magnet 2 because the inner side of the permanent magnet 2 is close to the axis of the rotor core 1, so that the magnetic flux distribution between the magnetism isolating hole 4 and the permanent magnet 2 on the whole rotor core 1 is more uniform, the air gap flux density waveform is improved, the electromagnetic force density peak value of the motor is reduced, and the noise peak value of the rotor pole number frequency doubling on a noise frequency spectrum is reduced.

As shown in fig. 1 to 7, one end of the main hole body 41 close to the axis of the rotor core 1 is disposed toward the permanent magnet 2, and one end of the main hole body 41 away from the axis of the rotor core 1 is disposed toward the outer circumferential surface of the rotor core 1; one end of the branch hole 42 is connected to the middle of the main hole body 41, and the other end of the branch hole 42 is disposed toward the middle of the permanent magnet 2.

The inner side of the trunk part (i.e. the main hole body 41) of the magnetism isolating hole 4 is close to the permanent magnet 2, the outer side is close to the outer circumferential surface of the rotor core 1, the branch hole 42 extends from the middle part of the trunk part of the magnetism isolating hole 4 to the permanent magnet 2, the part of the permanent magnet 2 close to the outer circumferential surface of the rotor core 1 is called the outer side of the permanent magnet 2, the part of the permanent magnet 2 close to the axis of the rotor core 1 is called the inner side of the permanent magnet 2, the tail end of the branch hole 42 is close to the middle part of the permanent magnet 2, so that the magnetic flux generated at the inner side of the permanent magnet 2 is more transmitted to the middle part of the magnetic pole 3, the magnetic flux generated at the outer side of the permanent magnet 2 is more transmitted to one side of the branch hole 42 close to the outer circumferential surface of the rotor core 1, the distribution of the air gap magnetic density at the, the working efficiency of the motor is improved, and the electromagnetic force density peak value of the motor and the electromagnetic vibration noise of the motor are reduced.

As shown in fig. 1, the permanent magnet 2 has a first end face and a second end face in a direction approaching the rotor core 1; on the predetermined plane, a straight line passing through a point of the branch hole 42 closest to the permanent magnet 2 and perpendicular to the permanent magnet 2 is a predetermined straight line 5; the distance between the preset straight line 5 and the first end face is A, and the distance between the preset straight line 5 and the second end face is B; wherein, A/B is more than or equal to 1.5 and more than or equal to 0.4.

Specifically, the tail end of the branch hole 42 is close to the middle of the permanent magnet 2, a perpendicular line is drawn from a point, which is closest to the permanent magnet 2, of the tail end of the branch hole 42 to the permanent magnet 2, the distance between the perpendicular line and an end face, which is close to the outer peripheral surface of the rotor core 1, of the permanent magnet 2 is a, the distance between the perpendicular line and an end face, which is close to the axis of the rotor core 1, of the permanent magnet 2 is B, and when the value of a/B is set within the range of 0.4 to 1.5, the sine degree of an air gap magnetic density waveform can be optimized, the torque ripple of the motor is minimized, the peak value of the electromagnetic force density of the motor is minimized.

As shown in fig. 1, in a direction away from rotor core 1, main hole body 41 has a first side wall surface and a second side wall surface, and branch hole 42 has a third side wall surface and a fourth side wall surface; the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E is more than or equal to F.

Preferably, in a direction away from rotor core 1, main hole body 41 has a first side wall surface and a second side wall surface, and branch hole 42 has a third side wall surface and a fourth side wall surface; the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E/F is more than or equal to 3.5 and more than or equal to 1.5.

The branch hole 42 extends from one side of the trunk portion of the magnetism isolating hole 4 (i.e., the main hole body 41), the outer side of the trunk portion of the magnetism isolating hole 4 is the side of the trunk portion of the magnetism isolating hole 4 close to the outer peripheral surface of the rotor core 1, the inner side of the trunk portion of the magnetism isolating hole 4 is the side of the trunk portion of the magnetism isolating hole 4 close to the axis of the rotor core 1, the distance between the branch hole 42 and the outer side of the trunk portion of the magnetism isolating hole 4 is E, the distance between the branch hole 42 and the inner side of the trunk portion of the magnetism isolating hole 4 is F, and the distance between the branch hole 42 and the outer side of the trunk portion of the magnetism isolating hole 4 is greater than the distance between the branch hole 42 and the inner side of the trunk portion of the magnetism.

When the value of the E/F is set within the range of 1.5 to 3.5, the branch hole 42 is close to the inner side position of the main part of the magnetism isolating hole 4, the trend of the magnetic flux emitted by one side, close to the axis of the rotor core 1, of the permanent magnet 2 can be improved, the length of the branch hole 42 along the radial direction of the rotor core 1 is not too long, the output torque of the motor is ensured, and meanwhile, the electromagnetic force density peak value of the motor and the electromagnetic vibration noise of the motor are reduced.

Preferably, the end face of one end of the main hole body 41 far away from the axis of the rotor core 1 is parallel to the outer circumferential surface of the rotor core 1 and has a distance P, and the width of the motor air gap of the motor formed by the rotor structure is δ; wherein, 1.7 is more than or equal to P/delta is more than or equal to 0.4.

The width delta of a motor air gap of the motor formed by the rotor structure is a gap between a rotor and a stator of the motor, and the air gap flux density refers to the magnetic induction intensity of a magnetic field existing in the air gap. The distance P between the side wall of the main hole body 41 close to the outer circumferential surface of the rotor core 1 and the outer circumferential surface of the rotor core 1 is the magnetic isolation bridge 6, and the magnetic isolation bridge 6 allows a part of the magnetic force to be transmitted to the air gap. The width of the magnetic isolation bridge 6 in the radial direction of the rotor core 1 is uniform along the circumferential direction of the rotor core 1, when the value of P/δ is set in the range of 0.4 to 1.7, the magnetic flux transmitted at the magnetic isolation bridge 6 is optimal, the air gap flux density waveform is optimally improved, the peak value of the electromagnetic force density of the motor is minimized, and the vibration noise of the motor is minimized.

Preferably, as shown in fig. 3, the branch hole 42 is provided in parallel with the permanent magnet 2 located on the magnetic pole 3 side and close to the branch hole 42, the minimum distance between the branch hole 42 and the corresponding permanent magnet 2 is Q, and the thickness of the permanent magnet 2 is R; wherein Q/R is more than or equal to 3 and more than or equal to 1.2.

The branch hole 42 and the permanent magnet 2 are parallel to each other, a distance is formed between the branch hole 42 and the permanent magnet, the distance is Q, and the thickness of the permanent magnet is R.

When the value of Q/R is set in the range of 1.2 to 3, the magnetic densities at the first path region 71 or the second path region 72 of the magnetic conduction path 7 between the magnetic isolation hole 4 and the permanent magnet 2 can be uniformly distributed, so that the increase of the iron loss caused by transition concentration of the magnetic densities is reduced, the branch hole 42 not only has an extension length along the circumferential direction of the rotor core 1, but also has an extension length along the radial direction of the rotor core 1, so that the magnetic conduction distribution at each position of the magnetic path on the rotor core 1 can be more uniform, the electromagnetic force density waveform of the air gap is effectively improved, the peak value of the magnetic density of the motor and the vibration noise of the motor are reduced, and meanwhile, the air gap magnetic density waveform distortion caused by excessive magnetic fluxes between the branch hole 42 and the permanent magnet is not more serious.

Preferably, as shown in fig. 4, the branch holes 42 are arranged perpendicular to the permanent magnets 2 located in the order of the magnetic poles 3 and close to the branch holes 42, the minimum distance between the branch hole 42 and the corresponding permanent magnet 2 is S, and the thickness of the permanent magnet 2 is R; wherein, 2.5 is more than or equal to S/R is more than or equal to 0.8.

The branch hole 42 is perpendicular to the permanent magnet 2, a distance exists between the branch hole 42 and the permanent magnet 2, the distance is S, the thickness of the permanent magnet is R, when the value of S/R is set in the range of 0.8 to 2.5, the branch hole 42 is closer to one side of the permanent magnet 2 close to the axis of the rotor core 1, the optimal distribution of magnetic fluxes of the two sides of the permanent magnet at the middle part of the magnetic pole 3 and the two ends of the magnetic pole 3 is further realized, the air gap flux density waveform is improved, and therefore the electromagnetic force density peak value of the motor and the electromagnetic vibration noise of the motor are reduced.

As shown in fig. 1 to 8, each magnetic pole 3 has a plurality of magnetism isolating holes 4, and the plurality of magnetism isolating holes 4 are provided in pairs; the two magnetism isolating holes 4 in pairs are respectively positioned on two sides of the magnetic pole center line 31 of the magnetic pole 3.

At least two magnetism isolating holes 4 with a 'halberd' shaped structure are arranged under each magnetic pole, a distance is reserved between the two magnetism isolating holes 4, and the two magnetism isolating holes are respectively positioned at two sides of a central line 31 of the magnetic pole.

As shown in fig. 1 to 6, the pair of two magnetism isolating holes 4 is symmetrical with respect to the magnetic pole center line 31.

As shown in fig. 5 and 6, the projection of the main hole body 41 on the predetermined plane is obliquely arranged relative to the magnetic pole center line 31 of the magnetic pole 3, and the included angle between the projection of the main hole body 41 on the predetermined plane and the magnetic pole center line 31 is T, wherein T ≦ 60 °.

The main parts of the magnetism isolating holes 4 are inclined relative to the magnetic pole center line 31, the angle between the main parts of the magnetism isolating holes 4 and the magnetic pole center line 31 is T, each magnetic pole 3 of the rotor core 1 of the magnetism isolating holes 4 is divided into three magnetism conducting paths 7, namely a first path area 71 and a second path area 72 are respectively formed between two magnetism isolating holes 4 and one permanent magnet 2, and a third path area 73 is formed between two magnetism isolating holes 4. The magnetic conduction paths 7 are made of the material of the rotor core 1 and have a large magnetic flux density, and the magnetic isolation holes 4 are filled with a non-magnetic substance such as air and have a small magnetic flux density.

When T is less than or equal to 60 degrees, the magnetic flux distribution and the magnetic flux trend of a plurality of areas on the rotor core 1 are improved by the magnetic isolation holes 4 with the inclined herringbone structures of the main parts, so that the magnetic conductance of a magnetic circuit is more uniform, the sine degree of the air gap flux density waveform of the motor is improved, the counter potential harmonic ratio of the motor is reduced, and the electromagnetic force density peak value of the motor and the electromagnetic vibration noise of the motor are reduced.

As shown in fig. 7, the two magnetism isolating holes 4 in a pair are a first magnetism isolating hole and a second magnetism isolating hole, respectively, the main hole body 41 of the first magnetism isolating hole is arranged in parallel with the main hole body 41 of the second magnetism isolating hole, and the branch holes 42 of the first magnetism isolating hole and the branch holes 42 of the second magnetism isolating hole are arranged at intervals along the extending direction parallel to the main hole bodies 41 of the first magnetism isolating hole and the second magnetism isolating hole.

Specifically, the distance between the branch hole 42 of the first magnetism isolating hole and the branch hole 42 of the second magnetism isolating hole along the extending direction of the main hole body 41 of the first magnetism isolating hole and the second magnetism isolating hole is U, and the widths of the projections of the branch hole 42 of the first magnetism isolating hole and the branch hole 42 of the second magnetism isolating hole on the predetermined plane are both V; wherein, 2 is more than or equal to V/U is more than or equal to 0.5.

The main hole bodies 41 of the two magnetism isolating holes 4 in each magnetic pole 3 are parallel to each other, the branch hole 42 of one magnetism isolating hole 4 is close to the axial line side of the rotor core 1, the branch hole 42 of the other magnetism isolating hole 4 is close to the peripheral surface side of the rotor core 1, and the two branch holes 42 are parallel to each other and have a distance U along the radial direction of the rotor core 1.

When the value of V/U is set in the range of 0.5 to 2, one magnetic pole 3 is provided with a branch hole 42 close to one side of the peripheral surface of the rotor core 1 and a branch hole close to the permanent magnet 2, so that the tooth space effect between the stator structure and the rotor structure is reduced, the magnetic conductance of the magnetic circuit between the stator structure and the rotor structure of the motor is more uniform, the sine degree of the air gap magnetic density waveform is improved, and the electromagnetic force density peak value of the motor and the vibration noise of the motor are reduced.

As shown in fig. 1 to 6 and 8, the two magnetism isolating holes 4 in a pair are symmetrically arranged with respect to the magnetic pole center line 31 of the magnetic pole 3; or the branch holes 42 of the paired two magnetism isolating holes 4 are located on the same side of the corresponding main hole body 41.

As shown in fig. 1 to 6, the pair of two magnetism isolating holes 4 is symmetrical with respect to the magnetic pole center line 31 of the magnetic pole 3.

As shown in fig. 8, it is preferable that one magnetism isolating hole 4 of the pair of two magnetism isolating holes 4 is shifted by a predetermined distance to coincide with the other magnetism isolating hole 4. In fig. 8, two magnetism isolating holes 4 arranged in a pair in the same magnetic pole 3 are located on both sides of the magnetic pole center line 31, the two magnetism isolating holes 4 are both arranged obliquely to the magnetic pole center line 31, main hole bodies 41 of the two magnetism isolating holes 4 are parallel to each other, branch holes 42 of the two magnetism isolating holes 4 are also parallel to each other, and the branch holes 42 of the two magnetism isolating holes 4 of the same magnetic pole 3 are both protruded in the counterclockwise direction in the circumferential direction of the rotor core 1 from one side of the main hole body 41. Therefore, the magnetic flux distribution of the middle part of the magnetic pole 3 and the two ends of the magnetic pole 3 is improved, and the magnetic conductance distribution of the rotor core 1 in the circumferential direction is improved, so that the air gap flux density waveform is improved, the harmonic wave is reduced, and the electromagnetic force density peak value of the motor and the vibration noise of the motor are reduced.

The utility model also provides a motor, including stator structure and rotor structure, rotor structure is foretell rotor structure. Thus, the vibration noise of the motor can be reduced.

The utility model also provides a compressor, including the motor, the motor is foretell motor. Thus, the vibration noise of the compressor can be reduced.

As shown in fig. 9, which is a comparison graph of the measured torque ripple of the prior art motor and the motor of the present application, it is apparent from fig. 9 that the range of the torque ripple of the motor of the present application is much smaller than that of the prior art motor.

As shown in fig. 10, in comparison with the measured back emf harmonic ratio of the conventional motor and the motor of the present application, it is apparent from fig. 10 that the back emf harmonic ratio of the motor of the present application is much smaller than that of the conventional motor.

As shown in fig. 11, which is a comparison graph of the measured peak values of the electromagnetic force densities of the conventional motor and the motor of the present application, it is apparent from fig. 11 that the peak value of the electromagnetic force density of the motor of the present application is much smaller than that of the conventional motor.

As shown in fig. 12, which is a comparison of the measured noise total of the compressor having the motor of the present application and the compressor having the motor of the present application, it is apparent from fig. 12 that the noise total of the compressor having the motor of the present application is much smaller than the noise total of the compressor having the motor of the present application.

The utility model provides a rotor structure, including rotor core 1 and permanent magnet 2. The permanent magnets 2 are arranged in permanent magnet grooves on the rotor core 1, the permanent magnets 2 on the rotor form N poles and S poles which are distributed alternately, magnetic isolation holes 4 are formed in magnetic poles 3 of the rotor core 1, and the magnetic isolation holes 4 are provided with main hole bodies 41 which extend along the radial direction of the rotor core 1, namely main parts of the magnetic isolation holes 4, and branch holes 42 which extend along the circumferential direction of the rotor core 1. Wherein, main hole body 41 and branch hole 42 link, and lie in the position of being close to main hole body 41 middle section, branch hole 42 stretches out from one side of main hole body 41, and this makes magnetic isolation hole 4 have gradient change along rotor core 1's circumferential direction and radial direction's width, along rotor core 1's radial direction and circumferential direction, magnetic isolation hole 4 both ends are narrow, the middle is wide, the shape is like "the turnip" font structure.

The permanent magnet motor depends on the permanent magnet 2 to generate a main magnetic field, and the permanent magnet motor has the advantages of high air gap magnetic density, high working efficiency, small volume, high power density, simple structure and high reliability, and is widely applied to various industries. However, in the permanent magnet synchronous motor, the magnetic energy product of the permanent magnet 2 made of the fixed-grade material is unchanged, the difficulty in adjusting the air gap magnetic field of the motor is high, and meanwhile, the tooth space structure of the motor enables the air gap magnetic density and the counter electromotive force to have high harmonic content and the peak value of the electromagnetic force density of the motor to be large, so that the torque pulsation and the vibration noise of the motor are high.

The utility model discloses a set up the magnetic isolation hole 4 of "turni" font structure on rotor core 1, the magnetic resistance distribution of each department's magnetic circuit of motor has been changed, the tooth's socket effect that has reduced the motor has been realized, the torque ripple of motor is reduced, improve the air gap magnetic density waveform, the back electromotive force harmonic that reduces the motor simultaneously accounts for than, reduce the electromagnetic force density peak value of motor, and reduce the technological effect of the electromagnetic vibration noise of motor, the air gap magnetic density of having solved PMSM, back electromotive force waveform distortion rate is high, the back electromotive force harmonic accounts for than greatly, motor torque pulsation is big, motor electromagnetic force is big and the big and big problem of noise of motor vibration.

The utility model provides a rotor structure with rotor core 1, a plurality of permanent magnet 2 and separate magnetic pore 4, wherein, a plurality of permanent magnet 2 form a plurality of magnetic poles 3 around rotor core 1' S axis evenly distributed on rotor core 1, including the N utmost point and the S utmost point, seted up on at least one magnetic pole 3 and separated magnetic pore 4, wherein, separated magnetic pore 4 includes the main hole body 41 and branch hole 42. Taking a plane perpendicular to the axis of the rotor core 1 as a predetermined plane, the main hole body 41, the branch holes 42 and the projection on the predetermined plane are both in a bar shape, the extending direction of the main hole body 41 is arranged to intersect with the circumferential direction of the rotor core 1, the center line of the extending direction of the branch holes 42 is connected with the main hole body 41, and the branch holes 42 are located at a position close to the middle of the main hole body 41, so that the widths of the magnetism isolating holes 4 in the circumferential direction and the radial direction of the rotor core 1 have gradient changes, that is, the sizes of the magnetism isolating holes 4 in the radial direction and the circumferential direction of the rotor core 1 have gradient changes, and meanwhile, the sizes and the shapes of the magnetism isolating holes 4 in the axial direction of the rotor core 1 are unchanged. Through the utility model provides a technical scheme has realized effectively improving motor magnetic circuit magnetic resistance distribution everywhere, improves the magnetic flow trend to adjust air gap magnetic field distribution, improve the dense wave form of air gap magnetism, reduce the tooth's socket effect of motor, reduce the back electromotive force harmonic of motor and account for than, reduce the torque ripple of motor, reduce the electromagnetic force density peak value of motor and reduce the technical effect of motor electromagnetic vibration noise, solved the great problem of vibration noise of the motor among the prior art.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (19)

1. A rotor structure comprising a rotor core (1) and a plurality of permanent magnets (2) disposed on the rotor core (1) to form a plurality of magnetic poles (3) on the rotor core (1), the plurality of magnetic poles (3) comprising a plurality of N poles and a plurality of S poles alternately disposed in a circumferential direction of the rotor core (1); it is characterized in that the preparation method is characterized in that,

at least one magnetic pole (3) of the rotor core (1) is provided with a magnetism isolating hole (4), and the magnetism isolating hole (4) comprises a main hole body (41) and a branch hole (42);

the plane perpendicular to the axis of the rotor core (1) is used as a preset plane, the projection of the main hole body (41) on the preset plane is in a strip shape and is crossed with the circumferential direction of the rotor core (1) along the extending direction of the main hole body, the projection of the branch hole (42) on the preset plane is in a strip shape, and the central line of the extending direction of the branch hole (42) is connected with the middle part of the main hole body (41).

2. The rotor structure of claim 1,

the projection of the branch hole (42) on the predetermined plane is perpendicular to the projection of the main hole body (41) on the predetermined plane; and/or

The projection of the main hole body (41) on the predetermined plane extends along the radial direction of the rotor iron core (1) or is parallel to a magnetic pole central line (31) of the magnetic pole (3); and/or

The branch hole (42) is located on one side of the main hole body (41).

3. The rotor structure according to claim 2, wherein the main hole body (41) includes a first hole section and a second hole section provided along an extending direction of the main hole body (41), the first hole section being located on a side of the branch hole (42) away from an axis of the rotor core (1), the second hole section being located on a side of the branch hole (42) close to the axis of the rotor core (1); the width of the first hole section is K, the width of the second hole section is M, and the maximum width of the magnetism isolating hole (4) is L; wherein, L/(K + M) is more than or equal to 4.5 and more than or equal to 0.7, and the width directions of the first hole section, the second hole section and the magnetism isolating hole (4) are all the directions which are perpendicular to the length direction of the magnetism isolating hole (4) on the preset plane.

4. The rotor structure according to claim 1, characterized in that the angle between the direction of extension of the projection of the main bore body (41) on the predetermined plane and the direction of extension of the projection of the branch bore (42) on the predetermined plane is C, and the angle between the permanent magnets (2) on both sides of the magnetic pole (3) is D; wherein, 3.7 is more than or equal to C/D is more than or equal to 0.2.

5. The rotor structure according to claim 1, characterized in that the minimum distance between the main hole body (41) and the permanent magnet (2) on the side of the magnetic pole (3) is G, and the minimum distance between the branch hole (42) and the permanent magnet (2) on the side of the magnetic pole (3) is H; wherein, H/G is more than or equal to 3.2 and more than or equal to 0.2.

6. The rotor structure according to claim 1, wherein an end of the main hole body (41) close to the axis of the rotor core (1) is disposed toward the permanent magnet (2), and an end of the main hole body (41) away from the axis of the rotor core (1) is disposed toward the outer circumferential surface of the rotor core (1); one end of the branch hole (42) is connected with the middle part of the main hole body (41), and the other end of the branch hole (42) is arranged towards the middle part of the permanent magnet (2).

7. A rotor structure according to claim 1, characterized in that the permanent magnets (2) have a first end face and a second end face in a direction close to the rotor core (1); on the predetermined plane, a straight line passing through a point of the branch hole (42) closest to the permanent magnet (2) and perpendicular to the permanent magnet (2) is a predetermined straight line (5); the distance between the predetermined straight line (5) and the first end face is A, and the distance between the predetermined straight line (5) and the second end face is B; wherein, A/B is more than or equal to 1.5 and more than or equal to 0.4.

8. The rotor structure according to claim 1, wherein the main hole body (41) has a first side wall surface and a second side wall surface, and the branch hole (42) has a third side wall surface and a fourth side wall surface in a direction away from the rotor core (1); the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E is more than or equal to F.

9. The rotor structure according to claim 1, wherein the main hole body (41) has a first side wall surface and a second side wall surface, and the branch hole (42) has a third side wall surface and a fourth side wall surface in a direction away from the rotor core (1); the first side wall surface and the third side wall surface are arranged in parallel and have a distance of F, and the second side wall surface and the fourth side wall surface are arranged in parallel and have a distance of E; wherein E/F is more than or equal to 3.5 and more than or equal to 1.5.

10. The rotor structure according to claim 1, wherein an end face of one end of the main hole body (41) away from the axis of the rotor core (1) is parallel to the outer circumferential surface of the rotor core (1) by a distance P, and the rotor structure forms a motor air gap of a motor having a width δ; wherein, 1.7 is more than or equal to P/delta is more than or equal to 0.4.

11. The rotor structure according to claim 1, characterized in that the branch holes (42) are arranged in parallel with the permanent magnets (2) located in the order of the poles (3) and close to the branch holes (42), the minimum distance between the branch holes (42) and the respective permanent magnets (2) being Q, the thickness of the permanent magnets (2) being R; wherein Q/R is more than or equal to 3 and more than or equal to 1.2.

12. The rotor structure according to claim 1, characterized in that the branch hole (42) is provided perpendicularly to the permanent magnet (2) on the side of the magnetic pole (3) and adjacent to the branch hole (42), the minimum distance between the branch hole (42) and the corresponding permanent magnet (2) is S, the thickness of the permanent magnet (2) is R; wherein, 2.5 is more than or equal to S/R is more than or equal to 0.8.

13. The rotor structure according to claim 1, characterized in that each of the magnetic poles (3) has a plurality of the magnetism isolating holes (4), the plurality of magnetism isolating holes (4) being provided in pairs; the two magnetism isolating holes (4) in pairs are respectively positioned on two sides of a magnetic pole center line (31) of the magnetic pole (3).

14. The rotor structure according to any of claims 1-13, characterized in that the projection of the main bore body (41) on the predetermined plane is arranged obliquely with respect to the pole centre line (31) of the pole (3), and the angle between the projection of the main bore body (41) on the predetermined plane and the pole centre line (31) is T, where T ≦ 60 degrees.

15. The rotor structure according to claim 13, wherein the two magnetism isolating holes (4) in a pair are a first magnetism isolating hole and a second magnetism isolating hole, respectively, the main hole body (41) of the first magnetism isolating hole is arranged in parallel with the main hole body (41) of the second magnetism isolating hole, and the branch holes (42) of the first magnetism isolating hole and the branch holes (42) of the second magnetism isolating hole are arranged at intervals along an extending direction parallel to the main hole bodies (41) of the first magnetism isolating hole and the second magnetism isolating hole.

16. The rotor structure according to claim 15, wherein the branch hole (42) of the first magnetism isolating hole and the branch hole (42) of the second magnetism isolating hole are spaced apart by a distance U in the extending direction of the main hole body (41) of the first magnetism isolating hole and the second magnetism isolating hole, and the widths of the projections of the branch hole (42) of the first magnetism isolating hole and the branch hole (42) of the second magnetism isolating hole on the predetermined plane are both V; wherein, 2 is more than or equal to V/U is more than or equal to 0.5.

17. The rotor structure of claim 13,

the two magnetism isolating holes (4) in pairs are symmetrically arranged relative to a magnetic pole center line (31) of the magnetic pole (3); or

The branch holes (42) of the two magnetism isolating holes (4) in a pair are positioned on the same side of the corresponding main hole body (41).

18. An electrical machine comprising a stator structure and a rotor structure, wherein the rotor structure is as claimed in any one of claims 1 to 17.

19. A compressor comprising an electric motor, wherein the electric motor is the electric motor of claim 18.

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