CN111864929A - Combined stator core, motor, compressor, air conditioner - Google Patents

Abstract

The invention provides a combined stator iron core, motor, compressor and air conditioner, wherein the stator iron core includes a first iron core punching group and a second iron core punching group arranged along the axial direction of the stator iron core, The first iron core punch group includes a plurality of spliced first punches, the second iron core punch group includes a plurality of spliced second punches, and the first punches and the second punches are connected by a hinge point, The hinged combined stator core has an annular yoke and a tooth, and along the radially outward direction of the stator core, the annular yoke has a yoke area corresponding to the tooth, and the hinge point is arranged in the yoke area. In the invention, the hinge point of the punching piece is arranged in the area of the annular yoke corresponding to the teeth, which improves the structural strength of the hinged combined stator core, reduces the influence on the magnetic circuit of the stator yoke, and is beneficial to improve the stability of the stator core. Coaxiality, reduce air gap magnetic field harmonics, reduce motor noise and improve motor efficiency.

Description

Combined stator core, motor, compressor, air conditioner

technical field

The invention belongs to the technical field of motor manufacturing, and in particular relates to a combined stator iron core, a motor, a compressor and an air conditioner.

Background technique

Environmental protection and energy conservation are important concerns for sustainable social development. With the improvement of living quality, the popularity of refrigeration and air-conditioning has increased. According to statistics, the electricity consumption of refrigeration and air-conditioning nationwide accounts for 20% of the annual electricity consumption. As an important component of refrigeration and air-conditioning, compressors consume the largest proportion of energy. Therefore, reducing the loss and improving the efficiency of the motor in the compressor has become a key issue. Further improving the full rate of the motor slot helps to reduce the winding resistance, thereby reducing the copper loss of the motor and improving the efficiency of the motor.

For the conventional full-circle stator core, the concentrated winding stator is used, and the winding nozzle needs to be extended into the stator slot for winding. Therefore, the winding nozzle needs to occupy a part of the slot area, resulting in a limited winding slot full rate. At present, the industry usually adopts the form of segmented stator iron core, and each iron core is wound and then spliced into a full circle to eliminate the slot area occupied by the winding nozzle. However, there are also many problems in the current segmented iron core structure, such as the large loss of magnetic field at the splicing, which leads to a certain reduction in the efficiency of the motor. At the same time, the rigidity of the splicing is low, the vibration noise of the stator is deteriorated, the inner circle of the stator after the splicing is poor, and the gas The harmonics of the gap magnetic field increase, and the vibration and noise of the motor deteriorate.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to provide a combined stator core, motor, compressor, and air conditioner. The structural strength of the stator iron core reduces the influence on the magnetic circuit of the stator yoke, which is beneficial to improve the coaxiality of the stator iron core, reduce the harmonics of the air gap magnetic field, reduce the noise of the motor and improve the efficiency of the motor.

In order to solve the above problems, the present invention provides a combined stator iron core, comprising a first iron core punching group and a second iron core punching group arranged along the axial direction of the stator iron core, the first iron core punching The sheet set includes a plurality of spliced first punching pieces, the second iron core punching piece group includes a plurality of spliced second punching pieces, and the first punching piece and the second punching piece are connected by a hinge point , the hingedly assembled stator core has an annular yoke and a tooth, and along the radially outward direction of the stator core, the annular yoke has a yoke area corresponding to the tooth, the A hinge point is provided in the region of the yoke.

Preferably, the diameter of the outer circle of the stator core is D1, the hinge point is a circular groove or a circular through hole, the center of the hinge point is on a distribution circle, and the diameter of the distribution circle is D2. The circle at the junction of the teeth and the annular yoke is the boundary circle of the teeth, the diameter of the boundary circle of the teeth is D5, the distribution circle and the boundary circle of the teeth are concentric with the outer circle of the stator core, D5<D2<D1.

Preferably, the center of the hinge point is on the center line of symmetry of the tooth.

Preferably, the second splicing line between any two adjacent second punching pieces in the second core punching sheet group includes a second splicing arc segment, and the curvature of the second splicing arc segment is The center coincides with the center of the hinge point, and the radius of curvature of the second splicing arc segment is D4/2, where D2-D4/2>D5.

Preferably, the tooth portion includes a winding column, any plane perpendicular to the axis of the stator core is a first projection plane, and the circumference of the projection of the winding column on the first projection plane The direction width is L1, and D4≤L1.

Preferably, in the radial direction of the stator iron core, the annular yoke portion between two adjacent tooth portions has a concave groove that is concave toward the outside of the stator iron core, and the concave groove is The minimum thickness between the bottom wall of the slot and the outer peripheral wall of the stator core is L2, where L2≥0.75·L1.

Preferably, the diameter of the hinge point is D3, 1 mm≤D3≤0.5·L2.

Preferably, on the first projection plane, the projection of the concave groove is a first straight line segment and a second straight line segment that intersect, and the first straight line segment and the second straight line segment are mirror images of each other, and the first straight line segment and the second straight line segment are mirror images of each other. An angle a3 is formed between the straight line segment and/or the second straight line segment and the circumferential side wall of the winding column immediately adjacent thereto, 80°<a3<100°.

Preferably, the second splicing line further includes a second splicing straight line segment, and one end of the second splicing straight line segment is tangent to the second splicing arc line segment relative to the outer side of the stator core, and the second splicing straight line segment is tangent to the second splicing arc line segment. The inner end of the spliced straight line segment is located on the tooth boundary circle relative to the inner side of the stator core.

Preferably, an angle a1 is formed between the second splicing straight line segment and the central symmetry line, 90°<a1<180°.

Preferably, the first splicing line between any two adjacent first punching pieces in the first iron core punching piece group includes a first splicing arc line segment, and the curvature of the first splicing arc line segment is The center coincides with the center of the hinge point.

Preferably, the first splicing line further includes a first splicing straight line segment, and an included angle a2 is formed between the second splicing straight line segment and the central symmetry line, 90°<a2<180° and a1<a2.

Preferably, the first punching piece has a first yoke part body corresponding to the annular yoke part and a first tooth part, the first tooth part and the first yoke part body form an inverse 7-shape, the The second punching piece has a first yoke part body corresponding to the annular yoke part and a second tooth part, the second tooth part and the second yoke part body form a 7-shape, the first punching piece and the second yoke part body The second punching pieces are mirror images of each other.

The present invention also provides a motor including a stator iron core, wherein the stator iron core is the above-mentioned combined stator iron core.

The present invention also provides a compressor, including the above-mentioned motor.

The present invention also provides an air conditioner, comprising the above compressor.

In the combined stator core, motor, compressor and air conditioner provided by the present invention, the hinge point is arranged in the yoke area corresponding to the teeth, so as to avoid the magnetism of the stator yoke due to the setting of the hinge point to the greatest extent. At the same time, arranging the hinge point in this area can also improve the structural strength of the hinged combined stator core, specifically because this area can avoid the small radial diameter of the yoke between the two teeth. Size position, when the stator core and the outer shell are assembled with interference fit, the deformation of the stator core after being stressed will be smaller due to the improvement of the structural strength, which is conducive to improving the coaxiality of the stator core and reducing the Air-gap magnetic field harmonics, reduce motor noise and improve motor efficiency.

Description of drawings

1 is a schematic three-dimensional structure diagram of a combined stator core according to an embodiment of the present invention;

Fig. 2 is the structural representation of the first iron core punch group in Fig. 1;

Fig. 3 is the structural representation of the first punching sheet in Fig. 2;

Fig. 4 is the structural representation of the second iron core punching group in Fig. 1;

Fig. 5 is the partial enlarged structure schematic diagram of A place in Fig. 4;

Fig. 6 is the structural representation of the second punching sheet in Fig. 4;

FIG. 7 is a schematic structural diagram of the first iron core punching group in the state of being rotated and unfolded in FIG. 2;

FIG. 8 is a schematic structural diagram of the second core punching group in FIG. 4 in a state of being rotated and unfolded;

9 is a motor efficiency comparison between the motor using the technical solution of the present invention and the motor in the prior art at different rotational speeds (operating frequencies);

FIG. 10 is a comparison of the noise within 1000 Hz of the compressor using the technical solution of the present invention and the compressor in the prior art at different rotational speeds (operating frequencies).

Reference numerals are indicated as:

1. The first core punching group; 11. The first punching sheet; 2. The second iron core punching group; 21. The second punching sheet; 3. The hinge point; 41. The second splicing arc segment; 42. The second splicing straight line segment; 51, the first splicing arc segment; 52, the first splicing straight line segment; 100, the annular yoke; 1001, the concave groove; 101, the tooth;

Detailed ways

Referring to FIG. 1 to FIG. 10 , according to an embodiment of the present invention, a combined stator iron core is provided, including a first iron core punch group 1 and a second iron core arranged along the axial direction of the stator iron core Punching group 2, the first iron core punching group 1 includes a plurality of spliced first punching pieces 11, the second iron core punching plate group 2 includes a plurality of splicing second punching pieces 21, the first punching piece 21 A punching piece 11 and the second punching piece 22 are connected by a hinge point 3, and the hinged combined stator core has an annular yoke 100 and a tooth 101 along the radially outward direction of the stator core , the annular yoke 100 has a yoke area corresponding to the teeth 101 , and the hinge point 3 is arranged in the yoke area. It can be understood that the first iron core punch group 1 and the second iron core punch group 2 are alternately arranged with each other in the axial direction of the stator iron core to form a stack, thereby forming the stator iron core, The formed stator core has the annular yoke portion 100 and the tooth portion 101 as a whole, and the first punching piece 11 has a first yoke partial body 111 and a first tooth portion 112 corresponding to the annular yoke portion 100 . , the first tooth portion 112 and the first yoke portion body 111 form an inverse 7-shape, and the second punching piece 21 has a first yoke portion body 211 and a second tooth portion corresponding to the annular yoke portion 100 212, the second tooth portion 212 and the second yoke part body 211 form a 7-shape, and the first punching piece 11 and the second punching piece 21 are mirror images of each other. The aforementioned yoke area corresponding to the teeth 101 is specifically the corresponding area of the annular yoke 100 corresponding to the tooth root of the winding post 1011 as shown in FIG. 2 and FIG. 4 . When there are magnetic lines of force in the stator core, the magnetic flux is relatively small, and arranging the hinge point 3 in this area can avoid the adverse effect on the magnetic circuit of the stator yoke due to the hinge point to the greatest extent. Arrangement in this area can also improve the structural strength of the hinged combined stator core, specifically because this area can avoid the radially small size position of the yoke between the two teeth, when the stator core and the outer shell are used. When assembled with interference fit, the deformation of the stator core after being stressed will be smaller due to the improvement of the structural strength, which is beneficial to improve the coaxiality of the stator core, reduce the harmonics of the air gap magnetic field, reduce the noise of the motor and improve the efficiency of the motor .

Further, the outer diameter of the stator iron core is D1, the hinge point 3 is a circular groove or a circular through hole, the center of the hinge point 3 is on the distribution circle, and the diameter of the distribution circle is D2. The circle at the junction of the tooth portion 101 and the annular yoke portion 100 is the tooth portion boundary circle, the diameter of the tooth portion boundary circle is D5, the distribution circle, the tooth portion boundary circle and the stator core are The outer circle is concentric, D5<D2<D1, at this time, the setting position of the hinge point 3 is limited to the position of the tooth root of the tooth portion 101, even if it is completely on the annular yoke portion 100 without occupying The position of the teeth 101 prevents adverse effects on the magnetic circuit. Preferably, the center of the hinge point 3 is located on the center symmetry line of the tooth portion 101, so that the punching pieces of the first iron core punching group 1 and/or the second iron core punching group 2 are The interchangeability is stronger, and at the same time, the symmetry of the stator iron core in the assembled structure is better.

As shown in FIG. 4 , the second splicing line between any two adjacent second punching pieces 21 in the second iron core punching piece group 2 includes a second splicing arc line segment 41 , and the second splicing arc line segment 41 . The center of curvature of the second splicing arc segment 41 coincides with the center of the hinge point 3, and the radius of curvature of the second splicing arc segment 41 is D4/2, D2-D4/2>D5, the aforementioned second splicing The line is essentially defined by the outer contour shapes of the adjoining positions of the two second punching pieces 21. By defining the size relationship of D2, D4, and D5, the second splicing arc segment 41 can be prevented from invading the The position of the teeth 101 reduces the adverse effect of the splicing line gap on the magnetic flux. At the same time, it can be understood that the second splicing arc segment 41 can ensure smooth hinged rotation, and can ensure the smallest splicing gap. Specifically, the tooth portion 101 (including the winding column 1011 , any plane perpendicular to the axis of the stator core is a first projection plane, and the winding column 1011 is on the first projection plane. The circumferential width of the projection is L1, D4≤L1.

In the radial direction of the stator iron core, the annular yoke portion 100 located between two adjacent tooth portions 101 has a concave groove 1001 recessed toward the outside of the stator iron core. The concave groove 1001 The minimum thickness between the bottom wall of the slot and the outer peripheral wall of the stator core is L2, L2≥0.75·L1, to avoid the magnetic density of the yoke from being too saturated and affecting the motor torque output. At this time, the diameter of the corresponding hinge point 3 is D3, 1mm≤D3≤0.5·L2, which ensures that the hinge point has a high hinge strength, and prevents the hinge point from being too large to cause a greater impact on the magnetic field.

On the first projection plane, the projection of the recessed groove 1001 is a first straight line segment and a second straight line segment that intersect, and the first straight line segment and the second straight line segment are mirror images of each other, and the first straight line segment is a mirror image of each other. An angle a3 is formed between the line segment and/or the second straight line segment and the circumferential side wall of the winding column 1011 immediately adjacent to it, 80°<a3<100°, which can ensure that the stator core is in the unfolded state high-speed winding to improve production efficiency.

The second splicing line further includes a second splicing straight line segment 42, and the second splicing straight line segment 42 is tangent to the second splicing arc line segment 41 relative to the outer end of the stator core. The inner end of the splicing straight segment 42 is located on the boundary circle of the tooth portion relative to the inner end of the stator iron core, so as to ensure that the second splicing line does not intrude into the tooth portion 101 (winding column 1011 ) as a whole. Reduce the adverse effect of splice lines on the magnetic circuit. Further, an included angle a1 is formed between the second splicing straight segment 42 and the central symmetry line, 90°<a1<180°, so as to ensure that the second splicing line does not exceed the angle on the teeth 101 . At the same time, the connection between the tooth portion and the yoke portion on the punching piece is not too narrow, so as to ensure the structural strength of each punching piece.

Similar to the second iron core punch group 2, the first splicing line between any two adjacent first punch pieces 11 in the first iron core punch group 1 includes a first splicing line. In the arc segment 51 , the curvature center of the first splicing arc segment 51 coincides with the circle center of the hinge point 3 . The first splicing line further includes a first splicing straight line segment 52, and one end of the first splicing straight line segment 52 is tangent to the first splicing arc line segment 51 relative to the outer side of the stator core. The inner end of the splicing straight segment 52 is located on the tooth boundary circle relative to the inner side of the stator iron core, and an angle a2 is formed between the second splicing straight segment 42 and the central symmetry line, 90°<a2<180 °and a1<a2.

The first iron core punching sheet group 1 and the second iron core punching sheet group can stack multiple sheets along the axial direction of the stator core in the group, and the axial thickness t of each single sheet punching sheet is ≤ 0.5mm, preferably The punching material is non-oriented cold-rolled electrical steel.

The hinge point 3 can be, for example, a circular boss on the upper punching piece and a circular groove on the lower punching piece (actually both are bumps punched out at a predetermined position of the punching piece). It is installed in the circular groove to form a rotatable structure. When the diameter of the hinge point 3 is large enough, the corresponding bumps can also be directly punched and cut to form a unified through hole. At this time, multiple through holes can be formed. Can be riveted by non-magnetic rivets.

In order to verify the actual effect of adopting the combined stator iron core of the technical solution of the present invention, the inventor has carried out experimental tests on the motor efficiency of the motor using it and the internal noise of the compressor at 1000 Hz. The results are shown in Figure 9 and Figure 10 respectively. out. As can be seen from Figure 9, the motor efficiency of the motor operating frequencies of 30Hz, 60Hz and 90Hz using the technical solution of the present invention is significantly improved; as can be seen from Figure 10, the compressor operating frequencies of the technical solution of the present invention are 30Hz, 60Hz and 90Hz. The noise within 1000Hz has been significantly reduced.

According to an embodiment of the present invention, a motor is further provided, including a stator iron core, wherein the stator iron core is the above-mentioned combined stator iron core.

According to an embodiment of the present invention, there is also provided a compressor including the above-mentioned motor.

According to an embodiment of the present invention, there is also provided an air conditioner including the above compressor.

It can be easily understood by those skilled in the art that, on the premise of no conflict, the above advantageous manners can be freely combined and superimposed.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside. The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (16)

1. A combined stator iron core, characterized in that it comprises a first iron core punching group (1) and a second iron core punching group (2) arranged along the axial direction of the stator iron core, the first iron core punching group (2) An iron core punch group (1) includes a plurality of spliced first punches (11), the second iron core punch group (2) includes a plurality of spliced second punches (21), the first punch A punching piece (11) and the second punching piece (22) are connected by a hinge point (3). The hinged and combined stator core has an annular yoke (100) and a tooth (101). In the radially outward direction of the stator core, the annular yoke (100) has a yoke area corresponding to the teeth (101), and the hinge point (3) is arranged in the yoke area . 2. The stator core according to claim 1, characterized in that, the outer diameter of the stator core is D1, the hinge point (3) is a circular groove or a circular through hole, and the hinge point (3) ) whose center is on the distribution circle, the diameter of the distribution circle is D2, and the circle passing through the junction of the tooth portion (101) and the annular yoke portion (100) is the tooth portion boundary circle, and the tooth portion boundary The diameter of the circle is D5, the distribution circle and the tooth boundary circle are concentric with the outer circle of the stator core, D5<D2<D1. 3 . The stator core according to claim 2 , wherein the center of the hinge point ( 3 ) is located on the center symmetry line of the tooth portion ( 101 ). 4 . 4. The stator core according to claim 3, characterized in that, the second core between any two adjacent second punches (21) in the second core punch group (2) The splicing line includes a second splicing arc segment (41), the center of curvature of the second splicing arc segment (41) coincides with the circle center of the hinge point (3), and the second splicing arc segment (41) ) has a radius of curvature of D4/2, D2-D4/2>D5. 5. The stator core according to claim 4, wherein the teeth (101) comprise winding posts (1011), and any plane perpendicular to the axis of the stator core is the first A projection plane, the circumferential width of the projection of the winding column (1011) on the first projection plane is L1, and D4≤L1. 6. The stator core according to claim 5, characterized in that, in the radial direction of the stator core, the annular yoke (100) located between two adjacent teeth (101) ) has a concave groove (1001) recessed toward the outside of the stator iron core, the minimum thickness between the bottom wall of the concave groove (1001) and the outer peripheral wall of the stator iron core is L2, L2≥0.75· L1. 7. The stator core according to claim 6, characterized in that, the diameter of the hinge point (3) is D3, 1 mm≤D3≤0.5·L2. 8. The stator core according to claim 6, characterized in that, on the first projection plane, the projection of the recessed groove (1001) is a first straight line segment and a second straight line segment that intersect, and the The first straight line segment and the second straight line segment are mirror images of each other, and an included angle a3 is formed between the first straight line segment and/or the second straight line segment and the circumferential side wall of the winding column (1011) immediately adjacent thereto, 80°<a3<100°. 9 . The stator core according to claim 4 , wherein the second splicing line further comprises a second splicing straight line segment ( 42 ), the second splicing straight line segment ( 42 ) is opposite to the stator iron. 10 . The outer end of the core is tangent to the second splicing arc line segment (41), and the second splicing straight line segment (42) is located on the tooth boundary circle relative to the inner end of the stator core. 10 . The stator core according to claim 9 , wherein an angle a1 is formed between the second splicing straight line segment ( 42 ) and the central symmetry line, 90°<a1<180°. 11 . 11. The stator core according to claim 10, characterized in that, between any two adjacent first tooth punching pieces (11) in the first core punching piece group (1) The first splicing line includes a first splicing arc segment (51), and the curvature center of the first splicing arc segment (51) coincides with the circle center of the hinge point (3). 12. The stator core according to claim 11, wherein the first splicing line further comprises a first splicing straight line segment (52), and the second splicing straight line segment (42) is aligned with the center line of symmetry An included angle a2 is formed between them, 90°<a2<180° and a1<a2. 13. The stator core according to claim 1, wherein the first punching piece (11) has a first yoke partial body (111) corresponding to the annular yoke (100) and a first tooth part (112), the first tooth part (112) and the first yoke part body (111) form a reverse 7-shape, and the second punching piece (21) has a corresponding ring-shaped yoke part (100) the first yoke part body (211) and the second tooth part (212), the second tooth part (212) and the second yoke part body (211) form a 7-shaped ) and the second punching piece (21) are mirror images of each other. 14 . A motor comprising a stator iron core, wherein the stator iron core is the combined stator iron core of any one of claims 1 to 13 . 15 . 15. A compressor comprising a motor, wherein the motor is the motor of claim 14. 16. An air conditioner comprising a compressor, wherein the compressor is the compressor of claim 15.

Images