A high rotor magnetic field concentration structure, rotor, motor and compressor

Abstract

The present invention provides a high rotor magnetic concentration structure, a rotor, a motor and a compressor, which relate to the technical field of motor technology and solve the technical problem that the utilization rate of magnetic steel is not high when the energy efficiency of the motor is improved. The high rotor magnetic concentration structure includes a structural body located at the end of the rotor and arranged perpendicular to the rotor d axis, and the structural body is made of a material with an axial magnetic resistance less than that of the laminated silicon steel sheet; the structural body includes a first core body and a second core body respectively located on both sides of part or all of the magnetic steel; the outer side of the first core body is an arc-shaped structure, and its arc outer diameter corresponding to the rotor d axis position is not greater than the arc outer diameter corresponding to the rotor q axis position; the rotor includes a magnetic concentration structure, and the magnetic concentration structure is located at the part of the rotor that is higher than the stator core; the motor includes the above-mentioned rotor; the compressor includes the above-mentioned motor. The present invention is used to provide a high rotor magnetic concentration structure that can achieve a high magnetic concentration effect, increase the utilization rate of magnetic steel, reduce circuit copper loss, and achieve the effect of improving the efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a high rotor magnetic field concentration structure, a rotor, a motor and a compressor. Background Art

[0002] The country now advocates a green development path and encourages companies to improve the energy efficiency of motors. At present, in order to improve efficiency while ensuring costs, most companies use a method where the rotor is higher than the stator. The conventional rotor structure is made of 0.3 or 0.35 thick silicon steel sheets stacked together, with insulating materials coated on the surface. The magnetic resistance between the sheets is large, mainly to reduce eddy current losses. Although this method reduces the cost of enameled wire, it makes it difficult for the magnetic flux to flow in the axial direction. The rotor magnetic flux that is higher than the stator core is difficult to interact with the stator through the axial flow, resulting in low utilization of the magnetic steel. Summary of the invention

[0003] The first aspect of the present invention aims to provide a high rotor magnetic field concentration structure to solve the technical problem in the prior art that when the motor energy efficiency is improved, the utilization rate of magnetic steel is not high.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The invention provides a high rotor magnetic field concentration structure, comprising a structural body located at the rotor end and arranged perpendicular to the rotor d-axis, wherein the structural body is made of a material having an axial magnetic resistance smaller than that of laminated silicon steel sheets.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] As a further improvement of the present invention, the structural body is arranged along the circumference of the rotor in a full circle or in a part-full circle.

[0008] As a further improvement of the present invention, the structural body includes a first core and a second core respectively located on both sides of the magnetic steel.

[0009] As a further improvement of the present invention, the first core and the second core are arranged on both sides of part or all of the magnetic steels.

[0010] As a further improvement of the present invention, the outer side of the first core body is an arc-shaped structure, and the outer diameter of the arc corresponding to the d-axis position of the rotor is not greater than the outer diameter of the arc corresponding to the q-axis position of the rotor.

[0011] As a further improvement of the present invention, the arc-shaped outer diameter of the first core body corresponding to the d-axis position of the rotor is not greater than the arc-shaped outer diameter of the corresponding side of the rotor.

[0012] As a further improvement of the present invention, the magnetic flux of the second core is no more than 1.5T.

[0013] As a further improvement of the present invention, the length of the second core is greater than the length of the magnetic steel.

[0014] As a further improvement of the present invention, the structural body also includes a reinforcement portion for increasing the strength of the connection between the structural body and the rotor.

[0015] As a further improvement of the present invention, the reinforcement portion includes a magnetic isolation bridge arranged between the ends of the first core and the second core, and the outer side of the magnetic isolation bridge is an arc structure, and the outer diameter of the arc is not larger than the outer diameter of the magnetic isolation bridge on the rotor.

[0016] As a further improvement of the present invention, all the first cores, all the second cores and all the magnetic isolation bridges are integrally formed structures. The ends of two adjacent first cores and two adjacent second cores are connected as one body via the magnetic isolation bridges.

[0017] As a further improvement of the present invention, the structural body is a whole iron core structure.

[0018] As a further improvement of the present invention, the height of the structural body is not less than the height of the magnetic steel.

[0019] As a further improvement of the present invention, the structural body is connected to the rotor via a buckle point.

[0020] The second aspect of the present invention aims to provide a rotor to solve the technical problem in the prior art that the utilization rate of magnetic steel is low when the energy efficiency of the motor is improved; the high magnetic concentration structure provided by the present invention can improve the utilization rate of magnetic steel and more reasonably utilize the magnetic flux of the rotor magnetic steel that exceeds the stator core part.

[0021] The present invention provides a rotor, comprising the magnetic field focusing structure.

[0022] Based on the above technical solution, the present invention can also be improved as follows.

[0023] As a further improvement of the present invention, the magnetic field focusing structure is located at a portion of the rotor that is higher than the stator core.

[0024] As a further improvement of the present invention, the magnetic field focusing structure is arranged at one end or both ends of the rotor.

[0025] The third aspect of the present invention aims to provide a motor to solve the technical problem in the prior art that when the motor energy efficiency is improved, the utilization rate of the magnetic steel is low; the high magnetic concentration structure provided by the present invention can improve the utilization rate of the magnetic steel and more reasonably utilize the rotor magnetic steel flux that exceeds the stator core part.

[0026] The present invention provides a motor, comprising the above-mentioned rotor.

[0027] The fourth aspect of the present invention aims to provide a compressor to solve the technical problem in the prior art that the utilization rate of magnetic steel is low when the motor energy efficiency is improved; the high magnetic concentration structure provided by the present invention can improve the utilization rate of magnetic steel and more reasonably utilize the magnetic flux of the rotor magnetic steel that is higher than the stator core part.

[0028] The present invention provides a compressor, comprising the above-mentioned motor.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The high rotor magnetic concentration structure provided by the present invention has a rotor higher than the stator core. By arranging a structural body made of a material whose axial magnetic resistance is less than the magnetic resistance of the laminated silicon steel sheets at the rotor end portion higher than the stator core portion, the magnetic flux of the rotor magnetic steel higher than the stator core portion can be more reasonably utilized, thereby improving the utilization rate of the magnetic steel.

[0031] In the optimization and improvement scheme of the high rotor magnetic focusing structure of the present invention, the outermost arc of the d-axis is equal to or smaller than the outermost arc of the q-axis, and the salient pole ratio is high; the magnetic focusing structure is made of a whole iron core without an insulating layer in the middle, which changes the traditional silicon steel sheet lamination process, reduces the magnetic resistance in the axial direction, and increases the magnetic flux flow; by using a whole iron core, the magnetic resistance in the axial direction of the rotor is reduced, so that the magnetic flux can flow more smoothly in the axial direction, and more magnetic steel flux interacts with the stator core, reducing leakage magnetic flux and achieving an excellent magnetic focusing effect; the magnetic focusing structure is located at a position higher than the stator core, and will not cause high loss due to the cutting effect of the stator magnetic field, so the magnetic focusing structure does not need to use the silicon steel sheet lamination process; the high rotor magnetic focusing structure provided by the present invention is arranged The position of the rotor higher than the stator core will not interact with the stator core in magnetic flux, so the appearance does not need to be the same as the rotor core in the middle part, and can be composed of relatively simple one or more arc segments. This structure greatly reduces wind friction resistance, reduces wind friction loss, and can effectively improve the efficiency of the motor; the present invention arranges a structural body with lower magnetic resistance at the d-axis position of the rotor end, and the d-axis magnetic resistance increases due to the smaller magnetic steel area, the salient pole ratio increases, the magnetic resistance torque becomes larger, and the utilization rate of the magnetic resistance torque is improved, which can effectively improve the efficiency of the motor; by arranging a magnetic focusing structure at the rotor end, the magnetic flux density in the axial direction of the overlapping part of the rotor and the stator and the part higher than the stator is different, which is beneficial to weaken harmonics and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the high rotor of the present invention when the magnetic field focusing structure is not installed;

[0034] Figure 2 It is a schematic diagram of the three-dimensional structure when the high rotor magnetic concentrating structure of the present invention is installed on the rotor end;

[0035] Figure 3 yes Figure 2 Schematic diagram viewed from the end of the rotor;

[0036] Figure 4 It is a structural schematic diagram of the high rotor magnetic field focusing structure of the present invention when it is installed on one end of the rotor and viewed from the bottom upward;

[0037] Figure 5 It is a partial schematic diagram of the high rotor magnetic field focusing structure of the present invention.

[0038] In the figure, 1 is the rotor; 2 is the structural body; 21 is the first core; 22 is the second core; 23 is the magnetic isolation bridge; 3 is the magnetic steel slot. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0040] like Figure 2 and Figure 4 As shown, the present invention provides a high rotor magnetic concentrating structure, which refers to a structure in which both ends of the motor's rotor are set higher than the stator core in order to improve the motor's energy efficiency; it includes a structure body 2 located at the end of the rotor 1 and arranged perpendicular to the rotor d axis, and the structure body 2 is made of a material with an axial magnetic resistance less than that of the laminated silicon steel sheet. In the prior art, both the rotor and the stator core are made of laminated silicon steel sheets, the surface of which is coated with insulating material, and the magnetic resistance between the sheets is large.

[0041] By arranging a structural body 2 made of a material having an axial magnetic resistance smaller than that of laminated silicon steel sheets at the rotor end portion higher than the stator core portion, the magnetic flux of the rotor magnetic steel higher than the stator core portion can be more reasonably utilized, thereby improving the utilization rate of the magnetic steel.

[0042] like Figure 1 As shown, a magnetic steel slot 3 is provided on the rotor 1, and the magnetic steel is placed in the magnetic steel slot 3. There is a rotor magnetic isolation bridge between the magnetic steel slot 3 and the edge of the rotor 1; the high rotor magnetic concentration structure in the present invention is installed on both sides of the magnetic steel slot 3.

[0043] like Figure 3 As shown, as an optional embodiment, the structural body 2 is arranged along the circumference of the rotor 1 in a full circle or in a partial circle. It should be noted that in the present invention, the structural body 2 is arranged along the circumference of the rotor 1 in a full circle.

[0044] like Figure 2 As shown, further, the structural body 2 includes a first core 21 and a second core 22 respectively located on both sides of the magnetic steel. The first core 21 serves to increase the magnetic flux at this part, so that the magnetic flux at the first core 21 part is higher than the original rotor magnetic flux, so that it can flow axially and achieve high magnetic concentration. The second core 22 is used to form a magnetic steel magnetic flux loop. There are no specific requirements for the area, shape and structure of the second core 22, which can be rectangular or elliptical, with the area as small as possible to increase the unit magnetic flux. The magnetic steel is placed in the magnetic steel slot 3.

[0045] It should be noted that, as an optional embodiment, the first core 21 and the second core 22 are provided on both sides of some or all of the magnetic steels. The accompanying drawings of the present invention show an embodiment in which the first core 21 and the second core 22 are provided on both sides of all the magnetic steels, and in the embodiment of the present invention, the number of magnetic steels is 6. After the first core 21 and the second core 22 are provided, a hexagonal structure body 2 is formed.

[0046] like Figure 3 As shown, in order to reduce wind resistance, the outer side of the first core 21 is an arc-shaped structure, and the outer diameter of the arc corresponding to the rotor d-axis position is not greater than the outer diameter of the arc corresponding to the rotor q-axis position.

[0047] In order to increase the magnetic flux, the arc-shaped outer diameter of the first core 21 corresponding to the rotor d-axis position is not greater than the arc-shaped outer diameter of the corresponding side of the rotor 1.

[0048] Specifically, the magnetic flux of the second core 22 is not greater than 1.5 T to avoid a blocked magnetic circuit. When the magnetic flux is high, the magnetic flux can be reduced by increasing its area.

[0049] It should be noted that, in the present invention, the length of the second core 22 is greater than the length of the magnetic steel.

[0050] In order to prevent the structural body 2 from falling off when rotating at high speed, the buckle points between the structural body 2 and the rotor may not play a firm role at too high a rotation speed, so the structural body 2 also includes a reinforcement part for increasing the connection strength between it and the rotor 1.

[0051] like Figure 3 and Figure 5As shown, as an optional embodiment, the reinforcement part includes a magnetic isolation bridge 23 arranged between the ends of the first core 21 and the second core 22, and the outer side of the magnetic isolation bridge 23 is an arc structure, and the outer diameter of the arc is not greater than the outer diameter of the magnetic isolation bridge on the rotor. Of course, the reinforcement part can also include other structures arranged between the first core 21 and the second core 22, as long as the contact area between the structural body 1 and the rotor is increased to increase the connection strength, and no specific limitation is made here.

[0052] For the convenience of processing, all the first cores 21, all the second cores 22 and all the magnetic isolation bridges 23 are integrally formed structures; of course, a split structure can also be used. The ends of two adjacent first cores 21 and two adjacent second cores 22 are connected as a whole through a magnetic isolation bridge 23. The structure of the magnetic isolation bridge 23 is not specifically limited, as long as the ends of the first core 21 and the second core 22 can be connected together. However, the outer side of the magnetic isolation bridge 23 needs to be an arc structure to reduce wind resistance. For low-speed motors, the magnetic isolation bridge 23 can be eliminated and fastened by buckling points. At high speeds, the magnetic isolation bridge 23 structure is added. There is no restriction on the shape and structure, but the outer contour of the magnetic isolation bridge 23 is an arc to form a low wind resistance structure.

[0053] In one embodiment of the present invention, the structural body 2 is a whole iron core structure. Of course, it can also be made of other materials as long as it is made of a whole piece of material.

[0054] Specifically, the height of the structural body 2 is not less than the height of the magnetic steel.

[0055] Specifically, the structural body 2 is connected to the rotor 1 through buckling points. The buckling points are products in the prior art purchased from the market.

[0056] The high rotor magnetic concentrating structure provided by the present invention reduces the axial magnetic resistance through the whole iron core structure, making the magnetic flux flow smoother. At the same time, the axial magnetic flux flow is achieved by increasing the unit magnetic flux of the magnetic concentrating structure and increasing the magnetic flux density. The area of ​​the magnetic concentrating structure on one side of the magnetic steel is smaller than that of the intermediate rotor. Therefore, the unit magnetic flux is large, the magnetic flux density is higher, and the axial magnetic flux flow is more convenient. At the same position, the magnetic flux when the laminated silicon steel sheet is used before the installation of the magnetic concentrating structure is 0.3555T. After the laminated silicon steel sheet is replaced by the magnetic concentrating structure, the magnetic flux at this position is 0.6458T, and the magnetic flux is higher.

[0057] The rotor q-axis mentioned here is also called the quadrature axis, which refers to the coordinate axis perpendicular to the direction of the rotor magnetic field. The d-axis is also called the direct axis, which is the coordinate axis in the direction of the rotor magnetic field.

[0058] The present invention provides a rotor, comprising the above-mentioned magnetic field focusing structure.

[0059] The magnetic field focusing structure is located at a portion of the rotor 1 that is higher than the stator core. As an optional implementation, the magnetic field focusing structure is disposed at one end or both ends of the rotor 1.

[0060] The present invention provides a motor, comprising the above-mentioned rotor.

[0061] The present invention also provides a compressor, comprising the above-mentioned motor.

[0062] The above-mentioned compressor is arranged in the air conditioner.

[0063] The high rotor magnetic concentration structure provided by the present invention has a rotor higher than the stator core. By arranging a structural body made of a material whose axial magnetic resistance is less than the magnetic resistance of the laminated silicon steel sheets at the rotor end portion higher than the stator core portion, the magnetic flux of the rotor magnetic steel higher than the stator core portion can be more reasonably utilized, thereby improving the utilization rate of the magnetic steel.

[0064] In the optimization and improvement scheme of the high rotor magnetic focusing structure of the present invention, the outermost arc of the d-axis is equal to or smaller than the outermost arc of the q-axis, and the salient pole ratio is high; the magnetic focusing structure is made of a whole iron core without an insulating layer in the middle, which changes the traditional silicon steel sheet lamination process, reduces the magnetic resistance in the axial direction, and increases the magnetic flux flow; by using a whole iron core, the magnetic resistance in the axial direction of the rotor is reduced, so that the magnetic flux can flow more smoothly in the axial direction, and more magnetic steel flux interacts with the stator core, reducing leakage magnetic flux and achieving an excellent magnetic focusing effect; the magnetic focusing structure is located at a position higher than the stator core, and will not cause high loss due to the cutting effect of the stator magnetic field, so the magnetic focusing structure does not need to use the silicon steel sheet lamination process; the high rotor magnetic focusing structure provided by the present invention is arranged The position of the rotor higher than the stator core will not interact with the stator core in magnetic flux, so the appearance does not need to be the same as the rotor core in the middle part, and can be composed of relatively simple one or more arc segments. This structure greatly reduces wind friction resistance, reduces wind friction loss, and can effectively improve the efficiency of the motor; the present invention arranges a structural body with lower magnetic resistance at the d-axis position of the rotor end, and the d-axis magnetic resistance increases due to the smaller magnetic steel area, the salient pole ratio increases, the magnetic resistance torque becomes larger, and the utilization rate of the magnetic resistance torque is improved, which can effectively improve the efficiency of the motor; by arranging a magnetic focusing structure at the rotor end, the magnetic flux density in the axial direction of the overlapping part of the rotor and the stator and the part higher than the stator is different, which is beneficial to weaken harmonics and reduce noise.

[0065] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high rotor magnetic field concentration structure, characterized in that: It includes a structural body located at the end of the rotor and arranged perpendicular to the rotor d axis, and the structural body is made of a material with an axial magnetic resistance smaller than that of the laminated silicon steel sheet; The structural body comprises a first core and a second core respectively located on both sides of part or all of the magnetic steels; The outer side of the first core body is an arc-shaped structure, and its arc outer diameter corresponding to the rotor d-axis position is not larger than the arc outer diameter corresponding to the rotor q-axis position; the arc outer diameter of the first core body corresponding to the rotor d-axis position is not larger than the arc outer diameter of the corresponding side of the rotor.

2. The high rotor magnetic field focusing structure according to claim 1 is characterized in that: The structural body is arranged along the circumference of the rotor in a full circle or in a part of a full circle.

3. The high rotor magnetic field focusing structure according to claim 1 is characterized in that: The magnetic flux of the second core is no more than 1.5T.

4. The high rotor magnetic field focusing structure according to claim 1 is characterized in that: The length of the second core is greater than the length of the magnetic steel.

5. The high rotor magnetic field focusing structure according to claim 1 is characterized in that: The structural body also includes a reinforcement portion for increasing the connection strength between the structural body and the rotor.

6. The high rotor magnetic field focusing structure according to claim 5 is characterized in that: The reinforcement part includes a magnetic isolation bridge arranged between the ends of the first core and the second core. The outer side of the magnetic isolation bridge is an arc structure, and the outer diameter of the arc is not greater than the outer diameter of the magnetic isolation bridge on the rotor.

7. The high rotor magnetic field focusing structure according to claim 6 is characterized in that: All of the first cores, all of the second cores and all of the magnetic isolation bridges are integrally formed structures.

8. A rotor, characterized in that: It comprises a high rotor magnetic field concentration structure as described in any one of claims 1-7.

9. The rotor according to claim 8, characterized in that The high rotor magnetic field focusing structure is located at a portion of the rotor that is higher than the stator core.

10. The rotor according to claim 9, characterized in that The high rotor magnetic field focusing structure is arranged at one end or both ends of the rotor.

11. A motor, characterized in that: Comprising a rotor as claimed in any one of claims 8 to 10.

12. A compressor, characterized in that: Comprising the motor as claimed in claim 11.

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