CN107579612B - Rotor punching sheet, rotor core and motor - Google Patents
Rotor punching sheet, rotor core and motor Download PDFInfo
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- CN107579612B CN107579612B CN201710766365.9A CN201710766365A CN107579612B CN 107579612 B CN107579612 B CN 107579612B CN 201710766365 A CN201710766365 A CN 201710766365A CN 107579612 B CN107579612 B CN 107579612B
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Abstract
The invention discloses a rotor punching sheet, a rotor iron core and a motor, wherein the rotor punching sheet is provided with a shaft hole and a plurality of magnet grooves which are circumferentially arranged around the shaft hole at intervals, the projection of the rotor punching sheet in a basal plane is divided into a plurality of unit parts by a plurality of straight lines which penetrate through the center of the shaft hole, each unit part is provided with one magnet groove, the basal plane is a plane which is vertical to the axial direction of the rotor punching sheet, each unit part is provided with a first through hole, a second through hole and a third through hole which are circumferentially arranged at intervals and axially penetrate through the rotor punching sheet, the first through hole, the second through hole and the third through hole are all positioned between the magnet grooves and the outer contour of the unit part, and the first through hole and the third through hole are distributed on two sides of the central line of the second through hole. According to the rotor punching sheet disclosed by the invention, the concentricity of the rotor can be ensured, the low-space order low-frequency radial force of the motor can be reduced, the low-frequency vibration of the motor can be reduced, and the performance of the motor can be improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor punching sheet, a rotor core with the rotor punching sheet and a motor with the rotor core.
Background
The motor in the related technology can not give consideration to both the concentricity of the stator and the rotor and the low-spatial order low-frequency radial force of the motor, and the performance of the motor is poor.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the rotor punching sheet provided by the invention can reduce the low-spatial order low-frequency radial force of the motor, reduce the low-frequency vibration of the motor and improve the performance of the motor while ensuring the concentricity of the rotor.
The invention further provides a rotor core with the rotor punching sheet.
The invention also provides a motor with the rotor core.
According to the rotor punching sheet disclosed by the embodiment of the first aspect of the invention, the rotor punching sheet is provided with the shaft hole and the plurality of magnet grooves which are circumferentially arranged around the shaft hole at intervals, the projection of the rotor punching sheet in the basal plane is divided into the plurality of unit parts by the plurality of straight lines which penetrate through the center of the shaft hole, each unit part is provided with one magnet groove, the basal plane is a plane which is vertical to the axial direction of the rotor punching sheet, each unit part is provided with the first through hole, the second through hole and the third through hole which are circumferentially arranged at intervals and axially penetrate through the rotor punching sheet, the first through hole, the second through hole and the third through hole are all positioned between the magnet grooves and the outer contour of the unit part, and the first through hole and the third through hole are distributed on two sides of the central line of the second through hole.
According to the rotor punching sheet provided by the embodiment of the invention, the first through hole, the second through hole and the third through hole are arranged, so that the concentricity of the rotor is ensured, the low-spatial order low-frequency radial force of the motor is reduced, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
In addition, the rotor sheet according to the embodiment of the invention can also have the following additional technical characteristics:
according to an embodiment of the invention, a center line of the second through hole coincides with a center line of the magnet slot, and the first through hole and the third through hole are symmetrically distributed on two sides of the center line of the second through hole.
Optionally, projections of the first through hole and the third through hole in the base surface each include a first straight line segment, a second straight line segment, and a third straight line segment disposed between the first straight line segment and the second straight line segment, extension lines of the first straight line segment and the third straight line segment intersect at a first intersection point, extension lines of the second straight line segment and the third straight line segment intersect at a second intersection point, an included angle α between a straight line passing through the first intersection point and a center of the shaft hole and a center line of the second through hole, an included angle β between a straight line passing through the second intersection point and a center of the shaft hole and a center line of the second through hole, and a central angle γ of the unit portion satisfy the following relational expressions: alpha/2 is not less than beta is not less than alpha/2 +1, and gamma/2-1 is not less than 2 x alpha is not less than gamma/2 + 1.
Optionally, the projections of the first through hole and the third through hole in the base surface each further include a fourth straight line segment that is disposed between the first straight line segment and the second straight line segment and is parallel to the third straight line segment.
Optionally, the first straight line segment and the third straight line segment are connected through a first circular arc segment; and/or the second straight line section is connected with the third straight line section through a second circular arc section.
According to an embodiment of the invention, a projection of the second through hole in the base surface is rectangular.
Optionally, the vertex of the second through hole is rounded.
According to an embodiment of the present invention, the outer contour of each unit portion includes two eccentric arc segments and a concentric arc segment disposed between the two eccentric arc segments, a center of the concentric arc segment coincides with a center of the shaft hole, and the center of the eccentric arc segment deviates from the center of the shaft hole.
The rotor core according to the second aspect of the present invention includes the rotor punching sheet according to the first aspect of the present invention.
According to the rotor core provided by the embodiment of the invention, the rotor punching sheet provided by the embodiment of the first aspect of the invention is arranged, so that the rotor core has all the advantages of the rotor punching sheet, namely, the concentricity of the rotor is ensured, the low-spatial order low-frequency radial force of the motor is reduced, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
A motor according to an embodiment of the third aspect of the present invention includes a rotor core according to the embodiment of the second aspect of the present invention described above.
According to the motor provided by the embodiment of the invention, the rotor core provided by the embodiment of the second aspect of the invention is arranged, so that the motor has all the advantages of the rotor core, namely, the concentricity of the rotor is ensured, the low-spatial order low-frequency radial force of the motor is reduced, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the invention;
fig. 2 is a schematic structural view of one unit portion of the rotor sheet shown in fig. 1;
fig. 3 is a schematic structural view of a first through hole on the cell part shown in fig. 2;
FIG. 4 is an enlarged view of the structure circled at A in FIG. 3;
FIG. 5 is a magnetic pole layout of a rotor plate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rotor sheet in the prior art.
Reference numerals:
a rotor sheet 100;
a shaft hole 1;
a magnet groove 2;
a first through-hole 3; a first straight line segment 31; a second straight line segment 32; a third straight line segment 33; a fourth straight line segment 34; a first arc segment 35; a second arc segment 36; the first intersection point 37; a second intersection 38;
a second through hole 4; the center line 41 of the second through hole 4;
a third through hole 5;
a unit section 6; a concentric arc segment 61; an eccentric circular arc segment 62.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "axial," "radial," "circumferential," and the like refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present application is based on applicants' discovery and recognition of the following facts and problems:
rotors in the related art generally adopt a cantilever structure and only have a unilateral bearing, so that in the installation process of the rotors, air gaps of the rotors need to be controlled by adjusting tools such as a feeler gauge and the like, and the process requires that an inner circular surface of a stator and an outer circular surface of the rotors need to be concentric circular arcs in a large range to well position the concentric circular arcs. Therefore, the outer circular arc of the rotor core must have a concentric circular arc with a larger span angle, so that the optimization difficulty of the rotor is increased, the low-spatial-order low-frequency component in the radial force of the motor is difficult to reduce, and the motor vibration is large.
In order to solve the above problems, the following two methods are generally adopted: (1) the outer circular arc of the rotor is designed into an eccentric structure, which is convenient for optimizing the rotor and reducing low-spatial-order low-frequency components in the radial force of the motor, but the point-surface corresponding relation exists between the outer circular surface of the rotor and the inner circular surface of the stator, and the air gap precision is not well controlled; (2) the outer circular arc of the rotor consists of a concentric circular arc and two eccentric circular arcs arranged at two ends of the concentric circular arc, the outer circular surface of the rotor and the inner circular surface of the stator are of corresponding structures which face each other, the air gap precision can be well controlled, and the radial force of low-spatial-order low-frequency components is large. Therefore, the motor in the related art cannot give consideration to both the concentricity of the stator and the rotor and the low-spatial order low-frequency radial force of the motor, and the performance of the motor is poor.
For this reason, this application provides a rotor punching 100, rotor punching 100 can reduce the low spatial order low frequency radial force of motor under the prerequisite of guaranteeing the fixed rotor concentricity, reduces the low frequency vibration of motor, promotes the motor performance, and manufacturing process is simple.
A rotor sheet 100 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 5.
As shown in fig. 1 to 5, a shaft hole 1 and a plurality of magnet grooves 2 arranged at intervals in the circumferential direction around the shaft hole 1 are arranged on a rotor sheet 100 according to an embodiment of the present invention, a projection of the rotor sheet 100 in a base plane is divided into a plurality of unit portions 6 by a plurality of straight lines passing through the center of the shaft hole 1, each unit portion 6 is provided with one magnet groove 2, the base plane is a plane perpendicular to the axial direction of the rotor sheet 100, each unit portion 6 is provided with a first through hole 3, a second through hole 4 and a third through hole 5 which are arranged at intervals in the circumferential direction and axially penetrate through the rotor sheet 100, each first through hole 3, the second through hole 4 and the third through hole 5 are located between the magnet groove 2 and an outer contour of the unit portion 6, and the first through hole 3 and the third through hole 5 are distributed on two sides of a center line 41 of the second through.
The term "plurality" means two or more, and may be, for example, two, three, four or more. For example, in the specific example shown in fig. 1, the number of the magnet grooves 2 is eight, four straight lines passing through the center of the shaft hole 1 divide the projection of the rotor sheet 100 in the base surface into eight unit portions 6, and each unit portion 6 is provided with one magnet groove 2.
According to the rotor punching sheet 100 provided by the embodiment of the invention, the first through hole 3, the second through hole 4 and the third through hole 5 are arranged between the magnet slot 2 and the outer contour of the unit part 6, so that the spatial lowest order and time 2 frequency multiplication components of the radial force of the motor and the spatial fundamental order and time 2 frequency multiplication components of the radial force of the motor can be greatly reduced on the premise of ensuring the concentricity of the rotor, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
In one embodiment of the present invention, as shown in fig. 1-2, the center line 41 of the second through-hole 4 and the center line of the magnet slot 2 coincide, and the first through-hole 3 and the third through-hole 5 are symmetrically distributed on both sides of the center line 41 of the second through-hole 4. That is, the first through-hole 3 and the third through-hole 5 are identical in shape and equal in size, and the first through-hole 3 and the third through-hole 5 are symmetrical with respect to the center line 41 of the second through-hole 4. Therefore, the lowest order of space of the radial force of the motor and the frequency multiplication component of time 2 and the fundamental order of space of the radial force of the motor and the frequency multiplication component of time 2 can be further reduced, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the concentricity of the stator and the rotor can be better ensured.
Preferably, as shown in fig. 2 to 4, the projections of the first through-hole 3 and the third through-hole 5 in the base plane each include a first straight line segment 31, a second straight line segment 32, and a third straight line segment 33 provided between the first straight line segment 31 and the second straight line segment 32, the extensions of the first straight line segment 31 and the third straight line segment 33 intersect at a first intersection point 37, the extensions of the second straight line segment 32 and the third straight line segment 33 intersect at a second intersection point 38, and an angle α between a straight line of the first intersection point 37 and the center of the shaft hole 1 and a center line 41 of the second through-hole 4, an angle β between a straight line of the second intersection point 38 and the center of the shaft hole 1 and a center line 41 of the second through-hole 4, and an angle γ of the center of the unit portion 6 satisfy the following relations: alpha/2 is not less than beta is not less than alpha/2 +1, and gamma/2-1 is not less than 2 x alpha is not less than gamma/2 + 1. Therefore, the concentricity of the rotor can be ensured, the space lowest order and time 2 frequency multiplication components of the radial force of the motor and the space fundamental order and time 2 frequency multiplication components of the radial force of the motor are further reduced, the low-frequency vibration of the motor is reduced, and the performance of the motor is improved.
Further, as shown in fig. 3, the projections of the first through hole 3 and the third through hole 5 in the base plane each further include a fourth straight line segment 34 provided between the first straight line segment 31 and the second straight line segment 32 and parallel to the third straight line segment 33.
Alternatively, as shown in fig. 3-4, the first straight line segment 31 and the third straight line segment 33 are connected by a first circular arc segment 35; and/or the second straight line segment 32 and the third straight line segment 33 are connected by a second circular arc segment 36. Thereby facilitating manufacturing.
In one embodiment of the invention, as shown in fig. 1 and 2, the projection of the second through hole 4 into the base surface is rectangular. Therefore, the lowest order of space of the radial force of the motor and the frequency multiplication component of time 2 and the fundamental order of space of the radial force of the motor and the frequency multiplication component of time 2 can be further reduced, the low-frequency vibration of the motor is reduced, the performance of the motor is improved, and the concentricity of the stator and the rotor can be better ensured.
Alternatively, as shown in fig. 1 and 2, the second through-hole 4 may be rounded at its apex. Thereby facilitating manufacturing.
In one embodiment of the present invention, as shown in fig. 1, the outer contour of each unit portion 6 includes two eccentric arc segments 62 and a concentric arc segment 61 disposed between the two eccentric arc segments 62, the center of the concentric arc segment 61 coincides with the center of the shaft hole 1, and the center of the eccentric arc segment 62 is offset from the center of the shaft hole 1. Preferably, the concentric circular arc segment 61 and the two eccentric circular arc segments 62 are both tangentially connected. Therefore, the concentricity between the stator and the rotor can be better ensured, the air gap harmonic wave is reduced, the vibration and the noise of the motor are smaller, and the performance of the motor is further improved.
The applicant of the present application calculates spatial 4-order time 2-multiplied radial force wave density and spatial 8-order time 2-multiplied radial force wave density of the motor provided with the rotor sheet 100 in the above-mentioned examples shown in fig. 1 to 5 of the present invention and the motor provided with the rotor sheet 100 in the prior art shown in fig. 6, respectively, and obtains:
it should be noted that the motor calculated in the above table is an 8-pole 12-slot motor, the lowest spatial order is 4 orders, and the fundamental spatial order is 8 orders.
From the above table, it is evident that: compared with the motor in the prior art, the motor provided with the rotor punching sheet 100 of the embodiment of the invention has the advantages that the spatial lowest order and the spatial fundamental order radial force are greatly reduced, and therefore the low-order low-frequency vibration of the motor is greatly reduced.
The rotor core according to the second aspect of the present invention includes the rotor sheet 100 according to the first aspect of the present invention. Specifically, the rotor core is formed by stacking a plurality of the above-mentioned rotor sheets 100, and further includes a plurality of permanent magnets, which are disposed in the plurality of magnet slots 2 in a one-to-one correspondence manner.
According to the rotor core provided by the embodiment of the invention, by arranging the rotor sheet 100 according to the embodiment of the first aspect of the invention, the rotor core has all the advantages of the rotor sheet 100, namely the concentricity of the rotor is ensured, the low-spatial-order low-frequency radial force of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
A motor according to an embodiment of the third aspect of the present invention includes a rotor core according to the embodiment of the second aspect of the present invention described above.
According to the motor provided by the embodiment of the invention, the rotor core provided by the embodiment of the second aspect of the invention is arranged, so that the motor has all the advantages of the rotor core, namely, the concentricity of the rotor is ensured, the low-spatial-order low-frequency radial force of the motor is reduced, the performance of the motor is improved, and the manufacturing process is simple.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A rotor punching sheet is characterized in that a shaft hole and a plurality of magnet grooves are formed in the rotor punching sheet at intervals in the circumferential direction around the shaft hole, the projection of the rotor punching sheet in a basal plane is divided into a plurality of unit parts by a plurality of straight lines penetrating through the center of the shaft hole, one magnet groove is formed in each unit part, the basal plane is a plane perpendicular to the axial direction of the rotor punching sheet, each unit part is provided with a first through hole, a second through hole and a third through hole which are spaced in the circumferential direction and penetrate through the rotor punching sheet in the axial direction, the first through hole, the second through hole and the third through hole are all located between the magnet grooves and the outer contour of the unit parts, and the first through hole and the third through hole are distributed on two sides of the central line of the second through hole;
the center line of the second through hole is superposed with the center line of the magnet slot, and the first through hole and the third through hole are symmetrically distributed on two sides of the center line of the second through hole;
the projections of the first through hole and the third through hole in the base surface respectively comprise a first straight line section, a second straight line section and a third straight line section arranged between the first straight line section and the second straight line section, the extension lines of the first straight line section and the third straight line section are intersected at a first intersection point, the extension lines of the second straight line section and the third straight line section are intersected at a second intersection point, an included angle alpha between a straight line passing through the first intersection point and the center of the shaft hole and the center line of the second through hole, an included angle beta between a straight line passing through the second intersection point and the center of the shaft hole and the center line of the second through hole and a central angle gamma of the unit part satisfy the following relational expression: alpha/2 is not less than beta is not less than alpha/2 +1, and gamma/2-1 is not less than 2 x alpha is not less than gamma/2 + 1.
2. The rotor sheet according to claim 1, wherein the projections of the first through hole and the third through hole in the base surface each further include a fourth straight line segment which is arranged between the first straight line segment and the second straight line segment and is parallel to the third straight line segment.
3. The rotor sheet according to claim 1, wherein the first straight line segment and the third straight line segment are connected through a first circular arc segment; and/or
The second straight line section is connected with the third straight line section through a second circular arc section.
4. The rotor sheet according to claim 1, wherein the projection of the second through hole in the base surface is rectangular.
5. The rotor sheet as recited in claim 4, wherein the second through hole is rounded at an apex thereof.
6. The rotor punching sheet according to any one of claims 1 to 5, wherein the outer contour of each unit portion comprises two eccentric arc segments and a concentric arc segment arranged between the two eccentric arc segments, the center of the concentric arc segment coincides with the center of the shaft hole, and the center of the eccentric arc segment deviates from the center of the shaft hole.
7. A rotor core, characterized by comprising a rotor sheet according to any one of claims 1 to 6.
8. An electric machine comprising a rotor core according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710766365.9A CN107579612B (en) | 2017-08-30 | 2017-08-30 | Rotor punching sheet, rotor core and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710766365.9A CN107579612B (en) | 2017-08-30 | 2017-08-30 | Rotor punching sheet, rotor core and motor |
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| Publication Number | Publication Date |
|---|---|
| CN107579612A CN107579612A (en) | 2018-01-12 |
| CN107579612B true CN107579612B (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710766365.9A Active CN107579612B (en) | 2017-08-30 | 2017-08-30 | Rotor punching sheet, rotor core and motor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108512320A (en) * | 2018-05-30 | 2018-09-07 | 广东威灵电机制造有限公司 | Stator core and electric rotating machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19851883A1 (en) * | 1998-11-10 | 2000-05-18 | Siemens Ag | Permanent magnet polyphase-machine especially synchronous machine |
| JP2004350345A (en) * | 2003-05-20 | 2004-12-09 | Matsushita Electric Ind Co Ltd | Permanent magnetic motor |
| EP2026445A2 (en) * | 2007-08-17 | 2009-02-18 | Continental Automotive GmbH | Synchronous machine with reduced cogging torque |
| CN106655681A (en) * | 2015-10-29 | 2017-05-10 | 富士通将军股份有限公司 | Rotor and permanent magnet electric motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004017507A1 (en) * | 2004-04-08 | 2005-10-27 | Minebea Co., Ltd. | Rotor arrangement for an electric machine |
| EP2348613B1 (en) * | 2008-11-19 | 2019-05-15 | Mitsubishi Electric Corporation | Rotor of motor and motor and fan and compressor |
| CN205986394U (en) * | 2016-09-05 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent -magnet machine and compressor |
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2017
- 2017-08-30 CN CN201710766365.9A patent/CN107579612B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19851883A1 (en) * | 1998-11-10 | 2000-05-18 | Siemens Ag | Permanent magnet polyphase-machine especially synchronous machine |
| JP2004350345A (en) * | 2003-05-20 | 2004-12-09 | Matsushita Electric Ind Co Ltd | Permanent magnetic motor |
| EP2026445A2 (en) * | 2007-08-17 | 2009-02-18 | Continental Automotive GmbH | Synchronous machine with reduced cogging torque |
| CN106655681A (en) * | 2015-10-29 | 2017-05-10 | 富士通将军股份有限公司 | Rotor and permanent magnet electric motor |
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| CN107579612A (en) | 2018-01-12 |
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