CN108880037B - Motor rotor, assembling method thereof and motor - Google Patents
Motor rotor, assembling method thereof and motor Download PDFInfo
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- CN108880037B CN108880037B CN201810805327.4A CN201810805327A CN108880037B CN 108880037 B CN108880037 B CN 108880037B CN 201810805327 A CN201810805327 A CN 201810805327A CN 108880037 B CN108880037 B CN 108880037B
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- end ring
- groove
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000002955 isolation Methods 0.000 claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 14
- 239000000696 magnetic material Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 5
- 238000007885 magnetic separation Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims 4
- 239000004411 aluminium Substances 0.000 claims 1
- 241000555745 Sciuridae Species 0.000 description 14
- 230000008569 process Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005347 demagnetization Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 230000002427 irreversible effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides a motor rotor, an assembling method thereof and a motor. The motor rotor is used in a permanent magnet synchronous motor and comprises a rotor core, wherein a first end ring and a second end ring are respectively arranged at two ends of the rotor core, a plurality of magnetic isolation guide strips are connected between the first end ring and the second end ring and penetrate through a groove of the rotor core, the rotor core is provided with a plurality of magnetic steel grooves, and the groove is located in an area between two adjacent magnetic steel grooves with opposite magnetic poles. According to the motor rotor, the assembling method thereof and the motor, the magnetic isolation guide bars are connected with the end rings, so that the connection reliability and the structural integrity of the motor rotor are improved, and the adjacent magnetic poles with opposite polarities of the motor rotor can be isolated.
Description
Technical Field
The invention belongs to the technical field of motor manufacturing, and particularly relates to a motor rotor, an assembling method of the motor rotor and a motor.
Background
At present, a high-speed permanent magnet synchronous motor is rapidly developed and widely used in working conditions such as a centrifuge of heating and ventilation equipment, because the motor has a high rotation speed (generally more than 10000 rpm) and a large rotational inertia of a rotor, a rotor structure generally adopts a slender rotor core (embedded magnetic steel 5 ') with a small lamination outer diameter and a large lamination thickness, fig. 1 shows a side view of a current motor rotor, fig. 2 shows a cross section of the motor rotor with the structure of fig. 1, the cross section shows a general structure of a current high-speed permanent magnet synchronous motor rotor lamination 6', four small circular holes 1 'can be used for cooling and ventilation, eight long grooves 2' are used for mounting magnetic steel 5 '(embedded), each two long grooves 2' are 1 pole, and total 4 poles (such as N, S in fig. 2), and can also be designed into one groove 1 pole or three grooves 1 pole according to actual needs. In order to separate the magnetic poles (N pole and S pole) as much as possible to reduce short-circuit magnetic leakage, a slot wedge 3 'is arranged at the corresponding position (wedge slot) of the long slot 2', the slot wedge 3 'is made of a non-metal insulating material, and a gap between the magnetic steel and the rotor is filled, so that the magnetic poles can be separated, mechanical damage to the rotor during high-speed rotation of a motor can be reduced, the rotor core is pressed by end rings 4' made of a non-magnetic material at two ends of the rotor core, the lamination coefficient is controlled to meet the requirement of technical drawings, and the magnetic steel can be prevented from moving along the axial direction of the rotor.
Because the existing slot wedge 3 'is mostly made of non-metal insulating materials, and the end ring 4' is made of metal non-magnetic materials, the two can not be connected together structurally, the stability and the reliability of rotor connection are not high, and the structural integrity is poor; in addition, when the load of the motor is unbalanced or the motor is asymmetrically short-circuited, the rotor can generate short-term axial flowing current, the current frequency is induced current of 2 times of the inverter current frequency, the induced current can enable the rotor to generate heat, the irreversible demagnetization of the magnetic steel can be possibly caused, and the conventional slot wedge structure can not play a role in protecting the rotor under the abnormal condition of the operation of the motor.
Disclosure of Invention
Therefore, an object of the present invention is to provide a motor rotor, an assembling method thereof, and a motor, in which a magnetic isolation bar is connected to an end ring, thereby improving the connection reliability and structural integrity of the motor rotor, and simultaneously isolating adjacent magnetic poles of opposite polarities of the motor rotor.
In order to solve the above problems, the present invention provides a motor rotor, which is used in a permanent magnet synchronous motor, and includes a rotor core, where two ends of the rotor core are respectively provided with a first end ring and a second end ring, a plurality of magnetic isolation bars are connected between the first end ring and the second end ring, the plurality of magnetic isolation bars pass through a groove provided in the rotor core, the rotor core has a plurality of magnetic steel slots, and the groove is located in an area between two adjacent magnetic steel slots with opposite magnetic poles.
Preferably, the groove is a semi-closed groove, and the magnetic isolation conducting bar passes through the semi-closed groove in a matching manner.
Preferably, the material of the magnetic isolation bars is a metallic non-magnetic material, the material of the first end ring is the same as that of the magnetic isolation bars, and/or the material of the second end ring is the same as that of the magnetic isolation bars.
Preferably, the metallic non-magnetic conductive material is one of aluminum or copper.
Preferably, the plurality of magnetic isolation conducting bars, the first end ring and the second end ring form a squirrel cage structure, and when the metal non-magnetic material is aluminum, the squirrel cage structure is formed by casting.
Preferably, when the metallic non-magnetic material is copper, two ends of the magnetic separation bar are respectively welded with the first end ring and the second end ring.
Preferably, the number of poles of the motor rotor is one of 2 poles, 4 poles, 6 poles and 8 poles.
Preferably, the number of the magnetic separation conducting bars is the same as the number of poles of the motor rotor.
The invention also provides an assembly method of the motor rotor, which comprises the following steps:
grinding a rotating shaft mounting hole of a rotor iron core;
the rotating shaft is inserted.
The invention also provides a motor which comprises the motor rotor.
According to the motor rotor, the assembling method thereof and the motor, the groove is arranged in the region between the magnetic steel grooves with opposite polarities of adjacent magnetic poles, and the magnetism isolating conducting strip penetrates through the groove, so that a wedge groove structure in the prior art is not needed, on one hand, the magnetism isolating conducting strip can effectively isolate magnetic steels of the adjacent magnetic poles or a magnetic circuit between magnetic steel groups, on the other hand, magnetic flux leakage along the surface of the rotor can be basically eliminated, and the surface eddy current of the rotor generated in the normal operation process of the motor can be reduced; on the other hand, the two ends of the magnetic isolation conducting bars are connected with the first end ring and the second end ring to form a squirrel cage structure, so that the magnetic steel in the magnetic steel groove can be obviously prevented from moving in the axial direction of the rotor, meanwhile, the connection reliability, the structural integrity and the structural strength of the motor rotor can be obviously improved due to the adoption of the integral squirrel cage structure, the position stability of the magnetic steel in the magnetic steel groove is improved, and the mechanical damage is effectively prevented.
Drawings
FIG. 1 is a schematic structural diagram of a rotor of a prior art electric machine;
FIG. 2 is a schematic partial cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of a squirrel cage structure in a motor rotor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a rotor core in a rotor of an electric machine according to an embodiment of the present invention.
The reference numerals are represented as:
1. punching; 2. a rotor core; 21. a groove; 22. a rotating shaft mounting hole; 23. a magnetic steel groove; 3. a squirrel cage structure; 31. a first end ring; 32. a second end ring; 33. magnetic isolation conducting bars; 1', a small round hole; 2', a long groove; 3', a slot wedge; 4', an end ring; 5', magnetic steel; 6' and rotor punching.
Detailed Description
With reference to fig. 1 to 4, according to an embodiment of the present invention, a motor rotor is provided, and is used in a permanent magnet synchronous motor, and includes a rotor core 2, where two ends of the rotor core 2 are respectively provided with a first end ring 31 and a second end ring 32, a plurality of magnetic isolation bars 33 are connected between the first end ring 31 and the second end ring 32, the plurality of magnetic isolation bars 33 pass through a groove 21 formed in the rotor core 2, the rotor core 2 has a plurality of magnetic steel slots 23, and the groove 21 is located in an area between two adjacent magnetic steel slots 23 with opposite magnetic poles. In the technical scheme, the groove 21 is arranged in the region between the magnetic steel grooves 23 with opposite polarities of adjacent magnetic poles, and the magnetism isolating conducting bar 33 penetrates through the groove 21, so that a wedge groove structure in the prior art is not needed, on one hand, the magnetism isolating conducting bar 33 can effectively isolate magnetic steels with adjacent two poles or a magnetic circuit between magnetic steel groups, on the other hand, magnetic leakage along the surface of a rotor can be basically eliminated, and the surface eddy current of the rotor generated in the normal operation process of a motor can be reduced; on the other hand, the two ends of the magnetic isolation conducting bar 33 are connected with the first end ring 31 and the second end ring 32 to form the squirrel cage structure 3, so that the magnetic steel in the magnetic steel groove 23 can be obviously prevented from moving in the axial direction of the rotor, meanwhile, due to the adoption of the integral squirrel cage structure 3, the connection reliability of the motor rotor can be obviously improved, the position stability of the magnetic steel in the magnetic steel groove 23 is improved, and the mechanical damage is effectively prevented.
Preferably, the groove 21 is a semi-closed groove, and the magnetic isolation conducting bar 33 is matched to pass through the semi-closed groove, so that the semi-closed groove can further eliminate magnetic leakage along the surface of the rotor, and further reduce the surface eddy current of the rotor generated in the normal operation process of the motor.
In terms of convenience of the connection process of the first end ring 31, the second end ring 32 and the magnetic-isolating bars 33, preferably, the magnetic-isolating bars 33 are made of a metal non-magnetic-conductive material, the first end ring 31 is made of the same material as the magnetic-isolating bars 33, and/or the second end ring 32 is made of the same material as the magnetic-isolating bars 33, and the connection members made of the same material can be connected by welding or the like, or by other methods such as bolting and riveting, and by adopting detachable methods such as bolting under the condition of the same material, the phenomenon that the abrasion of the connection members is aggravated by relative movement can be effectively ensured. By adopting the technical scheme, axial current which is possibly generated when the motor abnormally operates can be in short circuit in the squirrel cage structure 3 and can be mutually offset, short circuit leakage flux can be reduced, eddy current along the surface of the rotor when the motor normally operates is eliminated, furthermore, when the motor normally operates, the supporting and connecting stability of the squirrel cage structure 3 is more outstanding, the structural strength is better, when the motor operates abnormally, for example, when the load of the motor is unbalanced or the motor is asymmetrically short-circuited, short-time axial current can occur on the rotor, the current frequency is induced current which is always 2 times of the inverter current frequency, the induced current can cause the rotor (iron core) to rapidly heat, the rotor which rapidly heats can possibly cause irreversible demagnetization of the magnetic steel, and after the squirrel cage structure 3 adopting the technical scheme is adopted, the induced current with the 2 times of the frequency can be guided to mainly flow through the magnetic isolation guide bars 33, and forms a closed loop with the first end ring 31 and the second end ring 32, and the closed loop and the first end ring 31 and the second end ring 32 mutually offset, so that the excessive heat generation of the motor rotor of the high-speed permanent magnet synchronous motor can be prevented, and even the phenomenon of motor burnout can be avoided. The motor rotor is particularly suitable for the situation that the rotor comprises a rotor iron core of a slim high-speed permanent magnet synchronous motor. The metallic non-magnetic material may be, for example, one of aluminum, an aluminum alloy, a copper alloy, a stainless steel material, copper, or the like.
Further, when the metal non-magnetic-conductive material is aluminum, the squirrel-cage structure 3 is formed by casting; when the metal non-magnetic material is copper, two ends of the magnetic isolation conducting bar 33 are respectively welded with the first end ring 31 and the second end ring 32, and different forming processes or connecting processes are selected according to different metal non-magnetic materials, so that different characteristics of the materials are better met. Of course, in terms of specific assembly, the sequence of mounting the magnetic steel may be different due to different forming processes or connecting processes. For example, when the casting molding process is adopted, the magnetic steel in the rotor core needs to be magnetized after casting molding, so as to prevent the magnetic steel from generating a high-temperature demagnetization phenomenon in the casting process; when the welding connection process is adopted, the magnetizing of the magnetic steel can be performed before or after the squirrel cage structure 3 is formed.
In order to ensure that the squirrel-cage structure 3 in the motor rotor achieves the technical effects in the motor rotor and can be distinguished from the traditional permanent magnet synchronous motor adopting asynchronous starting of the squirrel-cage rotor, the number of poles of the motor rotor is preferably one of 2 poles, 4 poles, 6 poles and 8 poles. In order to make the problem more clear, it is emphasized that the cage structure 3 described above is similar to, but not identical to, the rotor core of the prior art asynchronous starting permanent magnet synchronous machine using cage windings, and functions completely different. In order to realize the asynchronous starting function of the asynchronous starting permanent magnet synchronous motor, the conducting bar grooves generally adopt open grooves and are distributed on the surface of the rotor, the quantity is more, the magnetic isolation conducting bars 33 in the technical scheme are arranged between two adjacent poles and in the grooves 21, the quantity of the conducting bar grooves is the same as the pole number of the rotor, the asynchronous starting permanent magnet synchronous motor is mainly suitable for a rotor core of a high-speed permanent magnet synchronous motor with a radial embedded magnetic steel structure, the magnetic isolation conducting bars have the functions of enhancing the structural strength and the magnetic isolation function in a normal state, and the function of preventing the motor rotor from generating too much heat in an abnormal state, as above, the number of the magnetic isolation conducting bars 33 is less because the ratio of 2 poles, 4 poles or 6 poles is more for the general rotor of the high-speed permanent magnet synchronous motor, and the asynchronous starting function can be ignored.
As can be seen from the above description, in the assembly of the motor rotor, since the integral type squirrel cage structure 3 is adopted in the technical solution, the assembly of the rotor core 2 and the rotating shaft thereof is more flexible, for example, the squirrel cage structure 3 and the rotor core 2 may be assembled into a whole (for example, by the above casting or welding), and then before the rotating shaft is inserted into the rotating shaft mounting hole 22 of the rotor core 2, the rotating shaft mounting hole 22 may be ground, which is beneficial to the installation between the rotating shaft and the rotor core, and is more reasonable and more reliable than the existing rotor assembly process, so the present invention further provides an assembly method of the motor rotor, which includes the following steps:
grinding the rotating shaft mounting hole 22 of the rotor core 2;
the rotating shaft is inserted.
Other steps are conventional and will not be described herein.
The invention also provides a motor, which comprises the motor rotor, the magnetic isolation conducting bars are connected with the end rings, the connection reliability of the motor rotor is improved, the motor rotor is protected when the load of the motor is unbalanced or the motor has asymmetric short circuit, the heat productivity of the motor rotor is reduced, the irreversible demagnetization of magnetic steel in the motor rotor is avoided, and meanwhile, the magnetic isolation can be carried out on adjacent magnetic poles with opposite polarities of the motor rotor.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (9)
1. The motor rotor is used in a permanent magnet synchronous motor and is characterized by comprising a rotor core (2), wherein a first end ring (31) and a second end ring (32) are respectively arranged at two ends of the rotor core (2), a plurality of magnetic isolation guide bars (33) are connected between the first end ring (31) and the second end ring (32), the plurality of magnetic isolation guide bars (33) penetrate through a groove (21) formed in the rotor core (2), the rotor core (2) is provided with a plurality of magnetic steel grooves (23), and the groove (21) is positioned in an area between two adjacent magnetic steel grooves (23) with opposite magnetic poles; the groove (21) is a semi-closed groove, and the magnetic isolation conducting bar (33) penetrates through the semi-closed groove in a matching mode.
2. An electric machine rotor according to claim 1, characterized in that the material of the magnetic barrier bars (33) is a metallic non-magnetic material, the material of the first end ring (31) is the same as the material of the magnetic barrier bars (33), and/or the material of the second end ring (32) is the same as the material of the magnetic barrier bars (33).
3. The electric machine rotor of claim 2, wherein the metallic non-magnetic conductive material is one of aluminum or copper.
4. The machine rotor according to claim 3, characterised in that the plurality of magnetic-separation bars (33) form a cage structure (3) with the first end ring (31) and the second end ring (32), the cage structure (3) being formed by casting when the metallic non-magnetic-conductive material is aluminium.
5. The machine rotor according to claim 3, characterised in that, when the metallic non-magnetic material is copper, the ends of the magnetic barrier bars (33) are welded to the first and second end rings (31, 32), respectively.
6. An electric machine rotor as claimed in any of claims 1 to 5, characterised in that the number of poles of the electric machine rotor is one of 2, 4, 6, 8 poles.
7. An electric machine rotor according to claim 1, characterised in that the number of the magnetic separation bars (33) is the same as the number of poles of the electric machine rotor.
8. A method of assembling a rotor for an electrical machine according to any one of claims 1 to 7, comprising the steps of:
grinding a rotating shaft mounting hole (22) of the rotor core (2);
the rotating shaft is inserted.
9. An electric machine comprising a machine rotor, characterized in that the machine rotor is a machine rotor according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810805327.4A CN108880037B (en) | 2018-07-20 | 2018-07-20 | Motor rotor, assembling method thereof and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810805327.4A CN108880037B (en) | 2018-07-20 | 2018-07-20 | Motor rotor, assembling method thereof and motor |
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| Publication Number | Publication Date |
|---|---|
| CN108880037A CN108880037A (en) | 2018-11-23 |
| CN108880037B true CN108880037B (en) | 2020-02-11 |
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| CN201810805327.4A Active CN108880037B (en) | 2018-07-20 | 2018-07-20 | Motor rotor, assembling method thereof and motor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327089A (en) * | 2018-11-27 | 2019-02-12 | 珠海格力电器股份有限公司 | Rotor, motor and air conditioning system |
| CN109510349A (en) * | 2018-11-27 | 2019-03-22 | 珠海格力电器股份有限公司 | Punching sheet, rotor, motor and air conditioning system |
| CN109256924A (en) * | 2018-11-27 | 2019-01-22 | 珠海格力电器股份有限公司 | Rotor core, motor and air conditioning system |
| CN110176817A (en) * | 2019-06-26 | 2019-08-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor core, rotor, motor, compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6278217B1 (en) * | 1999-12-09 | 2001-08-21 | General Electric Company | High voltage generator stator with radially inserted cable windings and assembly method |
| CN2904438Y (en) * | 2006-04-29 | 2007-05-23 | 刘洪预 | Full aluminium cast permanent magnetic rotor for permanent magnetic motor |
| JP5493710B2 (en) * | 2009-10-29 | 2014-05-14 | トヨタ紡織株式会社 | Laminated iron core, injection molding method and injection molding apparatus |
| CN202586689U (en) * | 2012-04-25 | 2012-12-05 | 山西北方机械制造有限责任公司 | Permanent magnet synchronous motor |
| CN107453504B (en) * | 2017-07-26 | 2019-11-08 | 北京交通大学 | A permanent magnet synchronous motor cage rotor with compound heat dissipation structure |
| CN207304196U (en) * | 2017-09-19 | 2018-05-01 | 襄阳航力机电技术发展有限公司 | A kind of built-in radial permanent magnet rotor structure |
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