CN217984682U

CN217984682U - Stator and rotor core structure for permanent magnet synchronous motor

Info

Publication number: CN217984682U
Application number: CN202221335918.8U
Authority: CN
Inventors: 王国俊; 李小平
Original assignee: Changzhou Jintan Weite Motor Co ltd
Current assignee: Changzhou Jintan Weite Motor Co ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-12-06
Anticipated expiration: 2032-05-31

Abstract

The utility model discloses a stator, rotor core structure for PMSM, including stator core and rotor core, the iron core is aligned by a plurality of punching sheets and is folded and press and constitute, and the stator core both ends all are provided with the stator insulating piece the same with stator punching sheet structure, are provided with along radially running through and the equidistant interval distribution's in circumference tooth's socket on the anchor ring of stator core, the tooth's socket radially forms from outside-in convergent shape along stator core, and tooth's socket quantity is no longer than 24 groups, rotor core has the pivot hole that link up along its axial, is provided with a plurality of magnet steel grooves along its circumference interval distribution on the rotor core, and magnet steel groove quantity is no longer than 8 groups; the outer diameter of the stator core is D1, the outer diameter of the rotor core is D2, and D2/D1 is more than or equal to 0.45 and less than or equal to 0.65. The utility model discloses a structural design of stator, rotor punching improves the magnetic field waveform, guarantees motor air gap flux density, reduces the energy loss of rotor operation in-process, promotes the performance of motor.

Description

Stator and rotor core structure for permanent magnet synchronous motor

Technical Field

The utility model relates to a permanent-magnet machine technical field especially relates to a stator, rotor core structure for PMSM.

Background

The permanent magnet synchronous motor is widely applied to the field of household appliances such as air-conditioning compressors and the like due to higher efficiency, the permanent magnet synchronous motor provides excitation by a permanent magnet, so that the structure of the motor is simpler, the processing and assembling cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, excitation current is not needed, excitation loss is avoided, and the efficiency and the power density of the motor are improved.

At present, rotor slots on common motor rotor punching sheets on the market are basically designed in a pear shape, a mold of the design is easy to manufacture, low in processing cost and long in service cycle, but the air gap magnetic density is low, so that the working efficiency is low, the shape of the punching sheets is not suitable, certain difficulty is possibly brought to wiring operation, and the overall performance of the motor is reduced.

SUMMERY OF THE UTILITY MODEL

According to the technical problem to be solved, a stator and rotor core structure for a permanent magnet synchronous motor is provided.

In order to achieve the purpose, the utility model discloses a stator and rotor core structure for a permanent magnet synchronous motor, which comprises a stator core and a rotor core, wherein the stator core is formed by aligning and laminating a plurality of stator punching sheets, the two ends of the stator core are respectively provided with a stator insulation sheet which has the same structure with the stator punching sheets, the annular surface of the stator core is provided with tooth grooves which radially penetrate and are circumferentially distributed at equal intervals, the tooth grooves radially form a shape gradually shrinking from outside to inside along the stator core, and the number of the tooth grooves is not more than 24 groups; the rotor core is formed by aligning and laminating a plurality of rotor punching sheets, the rotor core is provided with a rotating shaft hole which is axially penetrated through the rotor core, a plurality of magnetic steel grooves which are circumferentially distributed at intervals are arranged on the rotor core, the number of the magnetic steel grooves is not more than 8, and the outer contour of the rotor core is a polygon with circular arcs and straight lines alternately distributed; the outer diameter of the stator core is D1, the outer diameter of the rotor core is D2, and D2/D1 is more than or equal to 0.45 and less than or equal to 0.65.

Furthermore, the slot edges of two adjacent groups of tooth slots on the stator core are mutually parallel, the distance between the slot edges is not more than 10mm, the positions, close to the outer contour of the stator core, of the tooth slots are arc-shaped, the radius of the positions, close to the outer contour of the stator core, of the tooth slots is not more than 6.2mm, and the opening distance, close to the inner contour of the stator core, of the tooth slots is not more than 4mm.

Furthermore, the minimum distance between two adjacent groups of magnetic steel slots on the rotor core is not less than 2mm, the minimum distance between the magnetic steel slots and the outer contour of the rotor core is not less than 2mm, and the installation length of the permanent magnets in the magnetic steel slots is not more than 39.2mm.

Furthermore, the inner side of the magnetic steel groove is provided with weight reducing grooves which are distributed at equal intervals in the circumferential direction, the weight reducing grooves are pentagonal and are positioned between the magnetic steel groove and the rotating shaft hole, and rivet holes are distributed at intervals among the weight reducing grooves.

Furthermore, the magnetic steel groove is in a straight line shape, and two ends of the magnetic steel groove extend outwards to form a gap hole with the length not larger than 1.8 mm.

Furthermore, the air gap distance between the outer contour of the rotor core and the inner contour of the stator core is not more than 0.8mm.

Furthermore, a plurality of welding grooves are formed in the outer contour of the stator core, and rivet holes distributed circumferentially at equal intervals are formed in the outer side of the tooth socket.

Compared with the prior art, the utility model discloses the beneficial effect who produces: the utility model discloses a stator, rotor core structure for PMSM through the structural design in stator, the rotor punching, improves the magnetic field wave form, guarantees motor air gap flux density, reduces the energy loss of rotor operation in-process, promotes the performance of motor.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a front view of the stator core of the present invention.

Fig. 2 is a front view of the rotor core of the present invention.

Fig. 3 is a combined cross-sectional view of the rotor, the stator core and the permanent magnet according to the present invention.

Fig. 4 is a schematic view of a combined structure of the rotor, the stator core and the permanent magnet according to the present invention.

In the figure: 1 is a stator core; 2 is a tooth socket; 3 is a rotor core; 4 is a magnetic steel groove; 5 is a weight reduction groove; 6 is a permanent magnet; and 7, a stator insulation sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses an embodiment, as shown in fig. 1 to fig. 3, a stator for PMSM, rotor core structure, including stator core 1 and rotor core 3, stator core 1 is aligned to fold by a plurality of stator punching and is pressed to form, and stator core 1 both ends all are provided with the stator insulating piece 7 the same with stator punching structure, be provided with along radially running through and circumference equidistance interval distribution's tooth socket 2 on the anchor ring of stator core 1, tooth socket 2 forms from outside to inside convergent shape along stator core 1 is radial, tooth socket 2 quantity is no more than 24 groups; the rotor core 3 is formed by aligning and laminating a plurality of rotor punching sheets, the rotor core 3 is provided with a rotating shaft hole which is through along the axial direction of the rotor core, a plurality of magnetic steel grooves 4 which are distributed along the circumferential direction of the rotor core 3 at intervals are arranged on the rotor core 3, the number of the magnetic steel grooves 4 is not more than 8, and the outer contour of the rotor core 3 is a polygon with circular arcs and straight lines which are alternately distributed, so that the outer contour of the rotor core 3 has the concave characteristic, the structure is simple, the production is convenient, and the air gap flux density distribution can be optimized; the stator core 1 outer diameter is D1, and rotor core 3 outer diameter is D2, and satisfies that 0.45 is no less than or equal to D2D 1 is no less than or equal to 0.65, as a preferred embodiment of this application, the stator slot number is 24, the rotor pole number is 8, stator core 1 outer diameter D1=205.2mm, rotor core 3 outer diameter D2=125mm, forms the stator-rotor combination of 8 utmost point 24 grooves, reduces the motor air gap magnetic density harmonic content, reduces the electromagnetic excitation of motor.

The slot edges of two adjacent groups of tooth sockets 2 on the stator core 1 are parallel to each other and the distance is not more than 10mm, the positions, close to the outer contour of the stator core 1, of the tooth sockets 2 are arc-shaped with the radius not more than 6.2mm, the opening distance, close to the inner contour of the stator core 1, of the tooth sockets 2 is not more than 4mm, as a preferred embodiment of the application, the stator core 1 adopts a distributed winding mode, the area of each tooth socket 2 is 257.5mm, the circumference of each tooth socket 2 is 67.2mm, the stator core has a large flow area, the stator winding wound on the stator core is better cooled, and the weight of the core and the usage amount of silicon steel sheet materials are reduced, so that the production cost is reduced.

Minimum distance between two adjacent groups of magnetic steel grooves 4 on rotor core 3 is not less than 2mm, minimum distance between magnetic steel grooves 4 and the outer contour of rotor core 3 is not less than 2mm, installation length of permanent magnet 6 in magnetic steel grooves 4 is not more than 39.2mm, and air gap magnetic density is improved through structural position design of magnetic steel grooves 4.

The inboard of 4 magnetic steel grooves is provided with the heavy groove 5 that subtracts that circumference equidistance distributes, subtracts that heavy groove 5 is the pentagon and is located between magnetic steel groove 4 and the pivot hole, subtracts that the interval distributes between the heavy groove 4 has the rivet hole, subtracts heavy groove 5 and reduces the energy loss because of the dead weight arouses when the motor operation, promotes motor efficiency, subtracts heavy groove 5 inner space simultaneously and provides the air flow channel when the operation, increases the circulation of air, promotes the radiating effect, reduction in production cost.

Magnetism steel slot 4 is a style of calligraphy, and the outside gap hole that is not more than 1.8mm that extends in 4 both ends of magnet steel slot, and the gap hole provides the magnetism effect that separates, improves the magnetic field wave form simultaneously in order to discharge the interior air of magnetism steel slot 4 when installing permanent magnet 6, alleviate the installation degree of difficulty.

The air gap distance between the outer contour of the rotor core 3 and the inner contour of the stator core 1 is not more than 0.8mm, the air gap width is formed through the size design of the stator core 1 and the rotor core 3, the magnetic density is further improved, and the motor performance is improved.

Be provided with a plurality of welding grooves on the 1 outline of stator core, the outside of tooth's socket 2 is provided with the rivet hole that circumference equidistance distributes, because the stator core external diameter is greater than 205mm, adopts laser welding to carry out the fixed and supplementary with rivet connection between the piece, promotes joint strength.

The working principle of the embodiment is as follows: stator punching and rotor punching are folded through the alignment and are pressed formation stator core 1 and rotor core 3, fold and press the rivet of impressing through the rivet hole that distributes toward on the punching and fix after accomplishing, to stator core 1, the laser welding operation of can being convenient for in the welding groove on the outline, when inserting permanent magnet 6 in magnet steel groove 4, the slot air not only can be discharged in the gap hole that 4 both ends of magnet steel groove extend, also can be improving magnetic field waveform and gas gap magnetic density, it increases the circulation of air to subtract heavy groove 5 at the rotation in-process, promote the radiating effect, lighten rotor weight simultaneously, energy loss is reduced, thereby promote motor efficiency.

The points to be explained are as follows: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed; second, in this document, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The above examples are only illustrations of the present invention, and do not constitute limitations to the protection scope of the present invention, and all designs identical or similar to the present invention all belong to the protection scope of the present invention.

Claims

1. A stator and rotor core structure for a permanent magnet synchronous motor comprises a stator core (1) and a rotor core (3), and is characterized in that the stator core (1) is formed by aligning and laminating a plurality of stator punching sheets, stator insulation sheets (7) with the same structure as the stator punching sheets are arranged at two ends of the stator core (1), tooth sockets (2) which penetrate along the radial direction and are distributed at equal intervals along the circumferential direction are arranged on the annular surface of the stator core (1), the tooth sockets (2) form a shape gradually reducing from outside to inside along the radial direction of the stator core (1), and the number of the tooth sockets (2) is not more than 24 groups;

the rotor core (3) is formed by aligning and laminating a plurality of rotor punching sheets, the rotor core (3) is provided with a rotating shaft hole which penetrates through along the axial direction of the rotor core, a plurality of magnetic steel grooves (4) which are distributed at intervals along the circumferential direction of the rotor core (3) are arranged on the rotor core, the number of the magnetic steel grooves (4) is not more than 8, and the outer contour of the rotor core (3) is a polygon with alternately distributed circular arcs and straight lines;

the outer diameter of the stator core (1) is D1, the outer diameter of the rotor core (3) is D2, and D2/D1 is more than or equal to 0.45 and less than or equal to 0.65.

2. A stator and rotor core structure for a pmsm according to claim 1 wherein the slot edges of two adjacent slots (2) on said stator core (1) are parallel to each other and spaced no more than 10mm apart, said slots (2) are arc-shaped with a radius no more than 6.2mm near the outer contour of the stator core (1), and the opening distance of the slots (2) near the inner contour of the stator core (1) is no more than 4mm.

3. A stator and rotor core structure for a pmsm according to claim 1 wherein the minimum distance between two adjacent sets of the magnet steel slots (4) on the rotor core (3) is not less than 2mm, the minimum distance between the magnet steel slots (4) and the outer contour of the rotor core (3) is not less than 2mm, and the installation length of the permanent magnet (6) in the magnet steel slot (4) is not more than 39.2mm.

4. The structure of the stator and rotor core for the permanent magnet synchronous motor according to claim 1, wherein the inner side of the magnetic steel slot (4) is provided with lightening slots (5) which are circumferentially distributed at equal intervals, the lightening slots (5) are pentagonal and are positioned between the magnetic steel slot (4) and the rotating shaft hole, and rivet holes are distributed at intervals between the lightening slots (5).

5. The structure of the stator and rotor iron cores for the permanent magnet synchronous motor according to claim 1, wherein the magnetic steel slots (4) are in a straight line shape, and two ends of the magnetic steel slots (4) extend outwards to form gap holes with the diameter not larger than 1.8 mm.

6. A stator-rotor core structure for a permanent magnet synchronous machine according to claim 1, characterized in that the air gap distance between the outer contour of the rotor core (3) and the inner contour of the stator core (1) is not more than 0.8mm.

7. A stator and rotor core structure for a permanent magnet synchronous motor according to claim 1, characterized in that the stator core (1) is provided with a plurality of welding slots on the outer contour, and rivet holes are provided on the outer side of the tooth slot (2) and are distributed equidistantly in the circumferential direction.