CN109904949B - Squirrel-cage permanent magnet synchronous motor and rotor structure thereof - Google Patents
Squirrel-cage permanent magnet synchronous motor and rotor structure thereof Download PDFInfo
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- CN109904949B CN109904949B CN201910323641.3A CN201910323641A CN109904949B CN 109904949 B CN109904949 B CN 109904949B CN 201910323641 A CN201910323641 A CN 201910323641A CN 109904949 B CN109904949 B CN 109904949B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 28
- 238000004080 punching Methods 0.000 claims abstract description 106
- 241000555745 Sciuridae Species 0.000 claims abstract description 10
- 238000004512 die casting Methods 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a rotor structure of a squirrel-cage permanent magnet synchronous motor, which comprises rotor punching groups, rotor shaft sleeves, permanent magnets and rotor shafts, wherein each rotor punching group comprises 4-8 groups which are annularly arranged, each permanent magnet is axially fixed between two adjacent rotor punching groups, each rotor shaft sleeve is formed and fixed on the inner periphery of each rotor punching group in a die-casting manner, and each rotor shaft is fixed in each rotor shaft sleeve; each group of rotor punching sheet group comprises a first punching sheet group and a second punching sheet group which are fixed in an axial staggered manner, axial conducting strip grooves are uniformly distributed on the rotor punching sheet groups in the circumferential direction, conducting strips are arranged in the conducting strip grooves in a penetrating manner, rotor end covers are arranged at two ends of the rotor punching sheets, and the rotor end covers and the conducting strips are integrally die-cast to form a squirrel cage structure. The technical scheme of the invention has the following advantages: the rotor punching sheet can be firmly held, and can bear larger rotation torque at larger rotation speed; the magnetic energy product phenomenon of the lost permanent magnet is tiny, the application value of the permanent magnet is improved, and the efficiency and the power factor can be shown to be higher in operation.
Description
Technical Field
The invention relates to the technical field of permanent magnet synchronous motors, in particular to a squirrel-cage permanent magnet synchronous motor and a rotor structure thereof.
Background
The permanent magnet synchronous motor has the advantages of small volume, high reliability, high power density and torque density and the like, and is widely applied; the rotor punching sheet is one of the components of the permanent magnet synchronous motor, and the structure of the rotor of the permanent magnet synchronous motor has great influence on the performance of the permanent magnet synchronous motor.
At present, a rotor of a permanent magnet synchronous motor is embedded with permanent magnets, so that the efficiency and the power factor of the motor are improved. The closing of the magnetic circuit of the permanent magnet is divided into two parts, one part forms a closed magnetic circuit through the rotor iron core, namely a magnetic circuit with magnetic leakage, the other part forms a closed magnetic circuit through the stator iron core, and the more magnetic lines of force passing through the stator iron core, the higher the utilization rate of the permanent magnet. The conventional permanent magnet synchronous motor rotor is provided with a partition between the groove wings, but if the partition width between the groove wings is wider, the magnetic leakage is larger, permanent magnet materials are wasted, so that the cost is increased, the partition width is narrower, the mechanical strength of the part on the punching sheet is weaker, and when the rotor runs at a high speed for a long time, the punching sheet at the part is broken under the action of centrifugal force and electromagnetic force during running, so that the running of the motor rotor is influenced. The existing rotor structure of the permanent magnet motor is difficult to ensure the strength of a rotor core on the premise of ensuring small magnetic leakage.
Disclosure of Invention
In order to solve the technical problems, the rotor structure of the squirrel-cage permanent magnet synchronous motor and the permanent magnet synchronous motor using the rotor structure are provided, wherein the rotor structure is small in leakage inductance and can improve the efficiency and power factor of the permanent magnet synchronous motor.
The invention aims to achieve the aim, and is specifically realized by the following technical scheme:
The rotor structure of the squirrel-cage permanent magnet synchronous motor comprises rotor punching sheet groups, rotor shaft sleeves, permanent magnets and rotor shafts, wherein each rotor punching sheet group comprises 4-8 groups which are annularly arranged, each permanent magnet is axially fixed between every two adjacent rotor punching sheet groups, each rotor shaft sleeve is formed and fixed on the inner periphery of each rotor punching sheet group in a die-casting mode, and each rotor shaft is fixed in each rotor shaft sleeve; each group of rotor punching sheet group comprises a first punching sheet group and a second punching sheet group which are fixed in an axial staggered manner, axial conducting strip grooves are uniformly distributed on the rotor punching sheet groups in the circumferential direction, conducting strips are arranged in the conducting strip grooves in a penetrating manner, rotor end covers are arranged at two ends of the rotor punching sheets, and the rotor end covers and the conducting strips are integrally die-cast to form a squirrel cage structure.
As a further improvement scheme, the rotor shaft sleeve and the squirrel cage structure are made of aluminum. In order to reduce the resistance of the fixed structure in the rotor, high purity aluminum is more preferable, and if the impurity resistance increases, the efficiency decreases.
As a further improvement, the rotor shaft is in interference fit with the rotor shaft sleeve.
As a further improvement scheme, the outer side edge and the inner side edge of the rotor punching sheet group are concentric arcs; permanent magnet grooves and filling grooves are formed in two side edges of the rotor punching sheet group.
As a further improvement scheme, the filling grooves are in a dovetail groove shape, and connecting strips are fixedly die-cast between the filling grooves corresponding to the two adjacent rotor punching sheet groups and in the filling grooves.
As a further improvement scheme, the thickness of the first punching sheet group and the second punching sheet group is 3-30 mm.
As a further improvement scheme, the first punching sheet group is formed by laminating a plurality of layers of first punching sheets, and a first arc-shaped notch and a first connecting hole are formed in the inner side edge of the first punching sheet group; the second punching sheet group is formed by laminating a plurality of layers of second punching sheets, and a second arc-shaped notch and a second connecting hole are formed in the inner side of the second punching sheet group; the first arc notch corresponds to the second connecting hole, and the first connecting hole corresponds to the second arc notch.
As a further improved scheme, grooves and protrusions are formed on the first punching sheets, and two adjacent first punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a first punching sheet group; the second punching sheets are provided with grooves and protrusions, and two adjacent second punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a second punching sheet group.
As a further improvement scheme, a plurality of fixed guide posts are circumferentially arranged on the outer side surface of the rotor end cover.
A squirrel-cage permanent magnet synchronous motor adopts the rotor structure of the squirrel-cage permanent magnet synchronous motor in any scheme.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1) All rotor punching sheets are firmly held, and larger rotating torque can be born at larger rotating speed;
2) The rotor shaft sleeve is in hard fit with the rotor shaft, so that the rotor shaft sleeve is not easy to deform;
3) The magnetic energy product phenomenon of the lost permanent magnet is tiny, the application value of the permanent magnet is improved, and the efficiency and the power factor can be shown to be higher in operation;
4) Easy to manufacture and convenient to magnetize.
Drawings
FIG. 1 is a schematic diagram of a front structure of a rotor structure according to the present invention;
FIG. 2 is a schematic view of section A-A of FIG. 1;
FIG. 3 is a schematic view of a first punch set according to the first embodiment;
FIG. 4 is a schematic structural diagram of a second punch set according to the first embodiment;
FIG. 5 is a schematic structural diagram of a first punch set according to a second embodiment;
FIG. 6 is a schematic structural diagram of a second punch set according to the second embodiment;
fig. 7 is a schematic structural diagram of the second embodiment after the first punch set and the second punch set are matched.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise expressly stated or defined. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," and the like are used for convenience in describing the present invention and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 7, the rotor structure of the squirrel-cage permanent magnet synchronous motor of the present invention includes a rotor punching sheet group 1, a permanent magnet 2, a rotor shaft sleeve 3 and a rotor shaft 4, wherein the rotor punching sheet group 1 includes 4 to 8 groups, preferably 6 groups, which are annularly arranged, and other groups of embodiments can be obtained by increasing or decreasing the structural array of the present embodiment. In this embodiment, the permanent magnets 2 are 4 groups, and the permanent magnets 2 are axially fixed between two adjacent rotor sheet groups 1. The rotor shaft sleeve 3 is die-cast and fixed on the inner periphery of the rotor punching sheet group 1, and the rotor shaft 4 is fixed in the rotor shaft sleeve 3. The permanent magnet 2 is formed by die casting and fixing the rotor shaft sleeve 3, and then is magnetized by a magnetizing machine.
Each rotor punching group 1 comprises a first punching group 11 and a second punching group 12 which are axially staggered and fixed, and when the rotor punching group is assembled, the first punching group and the second punching group are axially alternately overlapped and installed to form a group of rotor punching groups. Axial conducting bar grooves 13 are uniformly distributed on the rotor punching sheet group 1 in the circumferential direction, conducting bars 6 are arranged in the conducting bar grooves 13 in a penetrating mode, the conducting bars 6 are formed and fixed in the conducting bar grooves 13 in a melting and die-casting mode, rotor end covers 5 are arranged at two ends of the rotor punching sheet group 1, and the rotor end covers 5 and the conducting bars 6 are integrally die-cast to form a squirrel cage structure. The thickness of the rotor end cover 5 is 10-30 mm.
Preferably, the rotor bushing 3 and the cage structure are both made of aluminum. The rotor shaft 4 is in interference fit with the rotor shaft sleeve 3. The rotor shaft sleeve 3 with the die-casting structure has strong firmness, can bear larger centrifugal force of each component of the rotor structure, has axial constraint capacity on the rotor punching sheet group 1, and has the function of difficult deformation when being in interference fit with the rotor shaft 4.
The outer side and the inner side of the rotor punching sheet group 1 are concentric arcs. Permanent magnet grooves 14 and filling grooves 15 are formed in two side edges of the rotor punching sheet group 1. The permanent magnet is made of permanent magnet material, and is magnetized after the rotor shaft sleeve 3 is die-cast, and the permanent magnet 2 is axially fixed between two adjacent rotor punching sheet groups 1 through the permanent magnet grooves 14. The filling grooves 15 are located outside the permanent magnet grooves 14, and are also die-cast with aluminum material, so that the fixed rotor punching sheet set and the inner and outer sides of the permanent magnets are fixed, and the permanent magnet punching sheet set and the inner and outer sides of the permanent magnets are also used as part of a squirrel cage structure.
The filling grooves 15 are in a dovetail groove shape, and connecting strips 7 are fixedly die-cast between the filling grooves 15 corresponding to the two adjacent rotor punching sheet groups 1 and in the filling grooves. The die-cast connecting strip 7 and the dovetail groove structure ensure that the two adjacent rotor punching sheet groups 1 are reliably fixed and the sheets are not scattered under the working condition of large torque.
As shown in fig. 3, the first punching group 11 has a thickness of 3 to 30mm, is formed by laminating a plurality of first punching layers, and is provided with a first arc-shaped notch 111 and a first connecting hole 112 on the inner side thereof. As shown in fig. 4, the second punching group 12 has a thickness of 3 to 30mm, is formed by laminating a plurality of layers of second punching, and is provided with a second arc-shaped notch 121 and a second connecting hole 122 on the inner side. The first arc-shaped notch 111 corresponds to the second connection hole 122, and the first connection hole 112 corresponds to the second arc-shaped notch 121.
The thickness of the first and second punch sets 11, 12 is determined by the rated number of revolutions of the motor, the lower the rated number of revolutions of the motor, the later the thickness of the first and second punch sets 11, 12. However, if the thickness is too small, the aluminum melt is not suitable for die casting during die casting of aluminum.
The first punching sheet and the second punching sheet are of a single structure of the rotor punching sheet group 1 and are formed by punching silicon steel sheets. The first arc-shaped notch 111 corresponds to the position and diameter of the second connecting hole 122, and the first connecting hole 112 corresponds to the position and diameter of the second arc-shaped notch 121. The first connecting holes 112 and the second connecting holes 122 are filled with die-casting melt while the rotor shaft sleeve 3 is pressed and molded, and form a fixing structure integrated with the rotor shaft sleeve 3, thereby forming a non-detachable and firm holding rotor punching sheet group 1. The diameters of the first and second connection holes 112 and 122, and the diameters of the first and second connection holes 112 and 122 are determined by the rated rotation number of the motor, and the lower the rated rotation number of the motor is, the larger the aperture is.
As shown in fig. 3 and 4, in the first embodiment, the first punch set 11 has 1 first arc-shaped notch 111 on the left side and 1 first connecting hole 112 on the right side of the inner side. In this embodiment, the second punch set 12 has a symmetrical structure of the first punch set 11, and thus, the left side of the inner side of the second punch set 12 has 1 second connecting hole 122 and the right side has 1 second arc-shaped notch 121. The first punching sheet set 11 can be directly turned over and then used as the second punching sheet set 12 to be assembled, and the structure of the first punching sheet set 11 and the second punching sheet set 12 after being overlapped and installed is shown in fig. 2.
As shown in fig. 5 to 7, in the second embodiment, the number of groups of rotor sheet groups 1 is preferably 4 groups. The middle part of the inner side edge of the first punching sheet group 11 is provided with 1 first arc-shaped notch 111, and two sides of the first arc-shaped notch 111 are provided with 2 first connecting holes 112; the second punching group 12 has 1 second connecting hole 122 in the middle of the inner side edge, and 2 second arc-shaped notches 121 on both sides of the second connecting hole 122. The first and second punch sets 11 and 12 are stacked with corresponding mounting locations as shown in fig. 7.
The first punching sheets are provided with grooves and protrusions, and two adjacent first punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a first punching sheet group 11; the second punching sheets are provided with grooves and protrusions, and the two adjacent second punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a second punching sheet group 12.
The outer side surface of the rotor end cover 5 is circumferentially provided with a plurality of fixed guide posts 51. The fixed guide post 51 is a conical post, and is used for fixing the dynamic balance body conveniently in dynamic balance, and the required balance rings with a plurality of weights can be inserted into the conical post and then fixed, so that the rotor structure can smoothly rotate.
The rotor structure after the steps of assembling, die casting filling, installing a rotating shaft and the like is subjected to external circle grinding, and then magnetizing and dynamic balance testing are carried out.
The rotor structure of the squirrel-cage permanent magnet synchronous motor in any embodiment is adopted.
The squirrel-cage permanent magnet synchronous motor of the invention utilizes the non-oriented silicon steel sheet of Bao-steel (domestic) to punch the stator and the rotor, and a three-phase asynchronous motor with the installation size of 112M-4, the rated power of 4Kw and 4 poles is manufactured as a comparative example. The comparative example is a three-phase asynchronous motor without embedded permanent magnets, and the rotating speed of the motor cannot reach the synchronous rotating speed. The motor in the comparative example was tested:
Rated voltage: 380 (V); rated power: 4.2 (kW); the detection date is 12 months and 8 days in 2018; the detection device is from Hangzhou Yidengkong technology Co. The test results are shown in Table 1:
table 1: the electrode detection structure of the application
Table 2: comparative examples Motor load performance conditions such as
With the stator of the motor in the comparative example, the motor was manufactured by using the rotor structure in the first embodiment of the present invention, and motor detection was performed:
Rated voltage: 350 (V); rated power: 4.2 (kW); the detection date is 2018, 11 and 8; the detection device is from Hangzhou Yidengkong technology Co. The detection results are shown in Table 3:
Table 3: detection results of motor manufactured by rotor structure in embodiment of the application
The motor load performance using the rotor of the example is shown in table 4:
Table 4: motor load performance detection of a rotor according to an embodiment of the application
The part of the PF in the table of the test report is the power factor, and it is found from the data in tables 1 to 4 that the test report in table 1 is generally lower in the motor power factor of the comparative example compared to table 3, and table 3 shows that the power factor is generally higher after permanent magnet is embedded, and can be improved from 0.83 in the comparative example to 0.87 in the present invention. The motor speed, efficiency and other performances are obviously improved by utilizing the invention.
The specific embodiments of the present invention are intended to be illustrative, rather than limiting, of the invention, and modifications thereof will be suggested to persons skilled in the art to which the present invention pertains without inventive contribution, as desired, after having read the present specification, but are to be protected by the patent law within the scope of the appended claims.
Claims (6)
1. The rotor structure of the squirrel-cage permanent magnet synchronous motor is characterized by comprising rotor punching sheet groups (1), permanent magnets (2), rotor shaft sleeves (3) and rotor shafts (4), wherein each rotor punching sheet group comprises 4-8 groups which are annularly arranged, each permanent magnet is axially fixed between every two adjacent rotor punching sheet groups, each rotor shaft sleeve is formed and fixed on the inner periphery of each rotor punching sheet group in a die-casting mode, and each rotor shaft is fixed in each rotor shaft sleeve; each rotor punching group comprises a first punching group (11) and a second punching group (12) which are axially staggered and fixed, axial guide strip grooves (13) are uniformly distributed on the rotor punching groups in the circumferential direction, guide strips (6) are arranged in the guide strip grooves in a penetrating manner, rotor end covers (5) are arranged at two ends of the rotor punching groups, and the rotor end covers and the guide strips are integrally die-cast to form a squirrel cage structure;
the outer side edge and the inner side edge of the rotor punching sheet group are concentric arcs, and both side edges of the rotor punching sheet group are provided with permanent magnet grooves (14) and filling grooves (15); the filling grooves are in a dovetail groove shape, and connecting strips (7) are fixedly die-cast between the filling grooves corresponding to the two adjacent rotor punching sheet groups and in the filling grooves;
The first punching sheet group is formed by laminating a plurality of layers of first punching sheets, and a first arc-shaped notch (111) and a first connecting hole (112) are formed in the inner side of the first punching sheet group; the second punching sheet group is formed by overlapping a plurality of layers of second punching sheets, and a second arc-shaped notch (121) and a second connecting hole (122) are formed in the inner side of the second punching sheet group; the first arc-shaped notch corresponds to the second connecting hole, and the first connecting hole corresponds to the second arc-shaped notch;
The first punching sheets are provided with grooves and protrusions, and two adjacent first punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a first punching sheet group; the second punching sheets are provided with grooves and protrusions, and two adjacent second punching sheets are correspondingly buckled and fixed through the grooves and the protrusions to form a second punching sheet group.
2. The rotor structure of a squirrel cage permanent magnet synchronous motor of claim 1, wherein the rotor bushing and the squirrel cage structure are both aluminum.
3. The rotor structure of a squirrel cage permanent magnet synchronous motor of claim 1, wherein the rotor shaft is in an interference fit with the rotor bushing.
4. The rotor structure of a squirrel cage permanent magnet synchronous motor according to claim 1, wherein the thickness of the first and second punching groups is 3-30 mm.
5. The rotor structure of a squirrel-cage permanent magnet synchronous motor according to claim 1, characterized in that a plurality of fixed guide posts (51) are circumferentially arranged on the outer side surface of the rotor end cover.
6. A squirrel-cage permanent magnet synchronous motor characterized in that a rotor structure of the squirrel-cage permanent magnet synchronous motor according to any one of claims 1 to 5 is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910323641.3A CN109904949B (en) | 2019-04-22 | 2019-04-22 | Squirrel-cage permanent magnet synchronous motor and rotor structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910323641.3A CN109904949B (en) | 2019-04-22 | 2019-04-22 | Squirrel-cage permanent magnet synchronous motor and rotor structure thereof |
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| CN109904949A CN109904949A (en) | 2019-06-18 |
| CN109904949B true CN109904949B (en) | 2024-07-09 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645621A (en) * | 2009-06-23 | 2010-02-10 | 无锡市华东钢业机械有限公司 | Permanent magnet synchronous motor rotor integration stamped sheet used for oil-field oil pumper |
| CN109067035A (en) * | 2018-07-27 | 2018-12-21 | 迈科国际控股（香港）有限公司 | Motor core, rotor and brushless motor |
| CN209462107U (en) * | 2019-04-22 | 2019-10-01 | 李明山 | A kind of squirrel-cage permanent magnet synchronous motor and its rotor structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368292A (en) * | 2012-03-26 | 2013-10-23 | 信质电机股份有限公司 | Novel structure of rotor punching sheet of permanent magnet motor |
| CN106533003B (en) * | 2016-11-18 | 2018-12-18 | 广东威灵电机制造有限公司 | Rotor and permanent magnet synchronous motor, freezer compressor and dish-washing machine with it |
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2019
- 2019-04-22 CN CN201910323641.3A patent/CN109904949B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645621A (en) * | 2009-06-23 | 2010-02-10 | 无锡市华东钢业机械有限公司 | Permanent magnet synchronous motor rotor integration stamped sheet used for oil-field oil pumper |
| CN109067035A (en) * | 2018-07-27 | 2018-12-21 | 迈科国际控股（香港）有限公司 | Motor core, rotor and brushless motor |
| CN209462107U (en) * | 2019-04-22 | 2019-10-01 | 李明山 | A kind of squirrel-cage permanent magnet synchronous motor and its rotor structure |
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