CN110380543B - Rotor subassembly, motor, compressor - Google Patents
Rotor subassembly, motor, compressor Download PDFInfo
- Publication number
- CN110380543B CN110380543B CN201910723795.1A CN201910723795A CN110380543B CN 110380543 B CN110380543 B CN 110380543B CN 201910723795 A CN201910723795 A CN 201910723795A CN 110380543 B CN110380543 B CN 110380543B
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- rotor
- permanent magnet
- adjusting part
- motor
- rotor assembly
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The utility model provides a rotor subassembly, motor, compressor, relates to motor, compressor technical field, and the rotor subassembly includes the rotor, the rotor includes rotor core and a plurality of permanent magnet of setting in rotor core, set up a plurality of holding tanks that prolong the rotatory range of center shaft on the rotor core, the permanent magnet sets up in the holding tank, the axial length of permanent magnet is not less than stator core's axial length, the permanent magnet is provided with temperature displacement adjusting part. The axial position of the permanent magnet in the accommodating groove can be automatically adjusted along with the temperature through the temperature displacement adjusting assembly, and the axial length of the permanent magnet is not less than that of the stator core, so that the effective magnetic conduction length of the stator core opposite to the rotor core is changed, the permanent magnet configuration for automatically adjusting the position is realized, the effect of adjusting the magnetic field of each pole of the rotor is achieved, the problem that the rotating speed of the rotor is limited is solved, the rotating speed ranges of the rotor, the motor and the compressor are widened, and the temperature displacement adjusting assembly is simple in structure and low in cost.
Description
Technical Field
The invention relates to the technical field of motors and compressors, in particular to a rotor assembly, a motor and a compressor.
Background
Permanent magnet motors are widely used due to their advantages of high efficiency and high power density. The permanent magnet motor rotor magnetic field is generated by permanent magnets and thus has the characteristic that the induced voltage increases with increasing rotational speed. Since the magnitude of the magnetic flux of the permanent magnet is difficult to adjust, the induced voltage increases in proportion to the increase in the rotation speed. The value of the induced voltage is limited by the voltage of the power supply, and therefore the rotating speed range of the permanent magnet motor is also limited.
In order to increase the rotation speed range of the permanent magnet motor, "field weakening control" is widely used in which a partial current is supplied to a stator coil to cancel a magnetic field generated by a permanent magnet, thereby reducing an induced voltage. However, the field weakening control is complicated to control, and also has a problem of efficiency reduction or the like because a reactive current not directly contributing to output is used from a limited power supply.
Disclosure of Invention
One of the purposes of the invention is to provide a rotor assembly which avoids the defects in the prior art, has simple structure and low cost, can solve the problem of limited rotor rotation speed, and widens the rotation speed range of the rotor.
The purpose of the invention is realized by the following technical scheme:
the rotor assembly comprises a rotor, wherein the rotor comprises a rotor iron core and a plurality of permanent magnets arranged in the rotor iron core, a plurality of accommodating grooves which are arranged in a rotating mode along a central axis are formed in the rotor iron core, the permanent magnets are arranged in the accommodating grooves, the axial length of the permanent magnets is not smaller than that of the stator iron core, and the permanent magnets are provided with temperature displacement adjusting assemblies. The rotor is when rotatory, inside temperature risees, temperature displacement adjusting part can be along with the axial position of temperature automatically regulated permanent magnet in the holding tank, because the axial length of permanent magnet is not less than stator core's axial length, the effective magnetic conduction length of the just right stator core of rotor core changes this moment, and then can adjust rotor and stator interact's effective magnetic field size, realize the temperature regulation of permanent magnet position, the limited problem of rotor rotational speed has been solved, the rotational speed range of rotor has been widened.
Further, the temperature displacement adjusting component is a non-magnetic adjusting component. The influence on the effective magnetic conduction length can be avoided, and the effect of widening the rotating speed range of the rotor is also the best.
Furthermore, the temperature displacement adjusting assembly comprises a first adjusting part and a second adjusting part, and the first adjusting part and the second adjusting part are respectively arranged at the upper end and the lower end of the permanent magnet. When the rotor rotates, the permanent magnet is prevented from shaking in the rotor to influence the waveform of a rotor magnetic field, and vibration noise is prevented from being increased.
Further, the first adjustment member has a thermal expansion rate greater than that of the second adjustment member. Different axial lengths of the first adjusting part and the second adjusting part at different temperatures are realized, and the permanent magnet is pushed to reach the corresponding height position.
Further, the thermal expansion coefficient of the first adjustment member is positive, and the thermal expansion coefficient of the second adjustment member is negative.
Further, the first adjusting part and the second adjusting part are made of elastic rubber or other materials with similar thermal expansion coefficients.
Furthermore, the mounting mode accessible of elastic rubber inserts the holding tank with the permanent magnet earlier, then through injecting into liquid elastic rubber colloid, fills corresponding position, and the solidification shaping realizes.
Furthermore, the installation mode of the elastic rubber can be realized by prefabricating the elastic rubber matched with the shape of the accommodating groove and inserting the elastic rubber into the corresponding position of the accommodating groove.
Furthermore, the permanent magnet is arranged in a flat plate shape, and the flat plate type permanent magnet can be formed in a blocking mode and can be divided into a plurality of small blocks in the axial direction and the radial direction.
Further, the accommodating groove can be in a V-shape, a U-shape or other combined structures.
Furthermore, rotor baffles are arranged at the upper end and the lower end of the rotor.
The second purpose of the invention is to provide a motor which avoids the defects in the prior art, has simple structure and low cost, can solve the problem of limited rotating speed of the motor and broadens the rotating speed range of the motor.
The purpose of the invention is realized by the following technical scheme:
the motor comprises a stator and a rotor, wherein the stator comprises a stator core and a winding, and the rotor is the rotor assembly.
The invention also aims to avoid the defects in the prior art and provide the compressor, which has the advantages of simple structure and low cost, and can solve the problem of limited rotating speed of the motor in the compressor and widen the rotating speed range of the motor.
The purpose of the invention is realized by the following technical scheme:
the compressor comprises a motor, wherein the motor comprises a stator and a rotor, the stator comprises a stator core and a winding, and the rotor is the rotor assembly.
The invention has the beneficial effects that: 1. the invention relates to a rotor assembly, which comprises a rotor, wherein the rotor comprises a rotor iron core and a plurality of permanent magnets arranged in the rotor iron core, a plurality of accommodating grooves which are rotationally arranged along a central shaft are formed in the rotor iron core, the permanent magnets are arranged in the accommodating grooves, the axial length of the permanent magnets is not less than the axial length of a stator iron core, and the permanent magnets are provided with temperature displacement adjusting components. The problem of limited rotor speed is solved, the rotating speed range of the rotor is widened, and meanwhile, the structure is simple and the cost is low. 2. The motor comprises a stator and a rotor, wherein the stator comprises a stator core and a winding, the rotor is the rotor assembly, the problem that the rotating speed of the motor is limited is solved by assembling the rotor assembly, the rotating speed range of the motor is widened, and the motor is simple in structure and low in cost. 3. The compressor comprises the motor, the motor comprises the stator and the rotor, the stator comprises the stator core and the winding, and the rotor is the rotor assembly.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic vertical sectional structure of a permanent magnet motor rotor according to the present invention.
Fig. 2 is a schematic cross-sectional structure of a permanent magnet motor of the present invention.
Fig. 3 is a schematic view of a vertical cross-sectional structure of a permanent magnet motor of the present invention.
Fig. 4 is a schematic diagram of a vertical cross-sectional structure of a permanent magnet motor according to the present invention operating in a heated environment.
Figure 5 is a graph comparing induced voltages for a permanent magnet machine according to the invention in the states of figures 3 and 4.
Figure 6 is a cogging torque comparison of a permanent magnet machine of the present invention in the states of figures 3 and 4.
The figure includes:
Detailed Description
The invention is further described with reference to the following examples.
The rotor assembly of this embodiment, as shown in fig. 1, including rotor 1, rotor 1 includes rotor core 11 and a plurality of permanent magnet 12 of setting in rotor core 11, rotor core 11 is last to have seted up a plurality of holding tanks 3 that extend the rotatory range of central axis, permanent magnet 12 sets up in holding tank 3, the axial length of permanent magnet 12 is greater than the axial length of the stator core who uses rather than the cooperation, permanent magnet 12 is provided with temperature displacement adjusting part 4. Rotor 1 is when rotatory, inside temperature risees, temperature displacement adjusting part 4 can be along with the axial position of temperature automatically regulated permanent magnet 12 in holding tank 3, because the axial length of permanent magnet 12 is greater than stator core's axial length, rotor core 11 just to the effective magnetic conduction length of stator core change this moment, and then can adjust rotor 1 and stator interact's effective magnetic field size, realize the temperature regulation of permanent magnet 12 position, the limited problem of rotor 1 rotational speed has been solved, rotor 1's rotational speed range has been widened.
The temperature displacement adjusting component 4 is a non-magnetic adjusting component. The influence on the effective magnetic conduction length can be avoided, and the effect of widening the rotating speed range of the rotor is also the best.
The temperature displacement adjusting assembly 4 comprises a first adjusting component 41 and a second adjusting component 42, wherein the first adjusting component 41 and the second adjusting component 42 are respectively arranged at the upper end and the lower end of the permanent magnet 12. When the rotor 1 rotates, the permanent magnet 12 is prevented from shaking in the rotor to influence the waveform of the magnetic field of the rotor 1, and vibration noise is prevented from increasing.
The thermal expansion coefficient of the first adjustment member 41 is positive, and the thermal expansion coefficient of the second adjustment member 42 is negative. Different axial lengths of the first adjusting part 41 and the second adjusting part 42 at different temperatures are realized, and the permanent magnet 12 is pushed to reach the corresponding height position.
And rotor baffles 5 are arranged at the upper end and the lower end of the rotor 1.
The invention also provides a motor with the rotor 1, which comprises a stator 2 and the rotor 1, wherein the stator 2 comprises a stator core 21 and a winding 22, as shown in fig. 2 and 3. The axial length of the permanent magnet 12 is greater than the axial length of the stator core 21.
The invention also provides a compressor with the rotor 1, which comprises a motor, wherein the motor comprises a stator 2 and the rotor 1, the stator 2 comprises a stator core 21 and a winding 22, and the axial length of the permanent magnet 12 is not less than that of the stator core 21.
When the motor works, the internal temperature rises, the first adjusting component 41 is heated to expand, the second adjusting component 42 is heated to contract, the permanent magnet 12 in the middle moves towards the second adjusting component, and the axial direction of the permanent magnet 12 is greater than the axial length of the stator core 21, so that the effective magnetic conduction length of the stator core 21 opposite to the rotor core 11 is changed, the size of an effective magnetic field of interaction between the rotor 1 and the stator 2 can be adjusted, different axial lengths of the adjusting components at different temperatures are realized, the permanent magnet 12 is pushed to reach a corresponding height position, and the temperature adjustment of the position of the permanent magnet is realized.
The motor operates in a normal temperature environment, as shown in fig. 3, the axial length of the stator core is H1, the axial length of the permanent magnet is H2, the permanent magnet 12 is located at the axial middle position of the magnetic pole, the height difference H1 between the lower end surface of the permanent magnet 12 and the lower end surface of the stator core 21 is zero, the effective magnetic conduction length of the permanent magnet 12 facing the stator core 21 through the rotor core 11 is L1, the axial length of the first adjusting part 41 is a1, and the axial length of the second adjusting part 42 is b 1. At this time, the permanent magnet 12 and the rotor core 11 have a large magnetic conductive area, and provide a large rotor magnetic flux, so that the induced voltage generated in the stator 2 becomes large, and the rotor magnetic field and the stator magnetic field are interlinked, thereby realizing a large torque output.
As the temperature rises, as shown in fig. 4, the first regulating member 41 whose thermal expansion coefficient is positive expands, and the axial length becomes a2, a2 is greater than a 1. The second regulating member 42 whose thermal expansion coefficient is negative contracts, and the axial length becomes b2, b2 being smaller than b 1. The first adjusting part 41 pushes the permanent magnet 12 axially to move from the middle position of the magnetic pole axis to the upper end position, the space contracted by the second adjusting part 42 is used for the permanent magnet to move axially, and the permanent magnet 12 is changed from the position shown in fig. 3 to the position shown in fig. 4. At this time, a height difference h2 is formed between the lower end face of the permanent magnet 12 and the lower end of the stator core 21, h2 is greater than h1, the effective magnetic conduction length of the permanent magnet 12 facing the stator core 21 through the rotor core 11 is L2, L2 is smaller than L1, the magnetic conduction area of the permanent magnet 12 and the rotor core 11 is reduced, and the provided rotor magnetic flux is reduced. The induced voltage generated in the stator 2 becomes small, and the maximum rotating speed of the motor operation becomes large when the power supply with the same specification supplies power. Meanwhile, the cogging torque of the motor during high-speed operation is reduced, the torque pulsation is reduced, and the high-speed operation performance of the motor is improved.
With this embodiment, the induced voltage of the motor shown in fig. 4 is reduced by 8% compared to that of the motor shown in fig. 3, and the comparison result is shown in fig. 5, while the cogging torque of the motor is reduced by 17% compared to that of fig. 6.
Conversely, as the temperature decreases, the first adjustment member 41 having a positive thermal expansion coefficient contracts, and the second adjustment member 42 having a negative thermal expansion coefficient expands, so that the rotor 1 can return from the position shown in fig. 4 to the position shown in fig. 3, and a large torque output in a normal temperature environment can be achieved.
Correspondingly, the first adjusting member 41 and the second adjusting member 42 may be made of elastic rubber or other materials with similar thermal expansion coefficients.
The mounting mode accessible of elastic rubber inserts holding tank 3 with permanent magnet 12 earlier, then through pouring into liquid elastic rubber colloid, fills corresponding position, and the solidification shaping realizes. Of course, the insertion into the corresponding position of the receiving groove 3 can also be realized by prefabricating the elastic rubber which is matched with the shape of the receiving groove 3.
As another embodiment, the permanent magnet is a flat plate type, and the flat plate type permanent magnet may be formed in a form of a block, and may be divided into several small blocks in the axial direction and the radial direction.
As another embodiment, the accommodating groove may be V-shaped, U-shaped or other combined structures.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (11)
1. A rotor assembly comprising a rotor including a rotor core and a plurality of permanent magnets disposed within the rotor core, characterized in that: the rotor core is provided with a plurality of holding tanks which are rotationally arranged along the central axis, the permanent magnet is arranged in the holding tanks, the axial length of the permanent magnet is not less than that of the stator core, the permanent magnet is provided with a temperature displacement adjusting assembly, the temperature displacement adjusting assembly comprises a first adjusting part and a second adjusting part, the first adjusting part and the second adjusting part are respectively arranged at the upper end and the lower end of the permanent magnet, and the thermal expansion rate of the first adjusting part is greater than that of the second adjusting part.
2. A rotor assembly as claimed in claim 1, wherein: the temperature displacement adjusting component is a non-magnetic adjusting component.
3. A rotor assembly as claimed in claim 1, wherein: the thermal expansion coefficient of the first adjustment member is positive, and the thermal expansion coefficient of the second adjustment member is negative.
4. A rotor assembly as claimed in claim 1, wherein: the first adjusting part and the second adjusting part are made of elastic rubber or other materials with similar thermal expansion coefficients.
5. A rotor assembly as claimed in claim 4, wherein: the mounting mode accessible of elastic rubber inserts the holding tank with the permanent magnet earlier, then through pouring into liquid elastic rubber colloid, fills corresponding position, and the solidification shaping realizes.
6. A rotor assembly as claimed in claim 4, wherein: the installation mode of the elastic rubber can be realized by prefabricating the elastic rubber matched with the shape of the accommodating groove and inserting the elastic rubber into the corresponding position of the accommodating groove.
7. A rotor assembly as claimed in claim 1, wherein: the permanent magnet is arranged in a flat plate shape, the flat plate type permanent magnet is formed in a blocking mode, and the permanent magnet is divided into a plurality of small blocks in the axial direction and the radial direction.
8. A rotor assembly as claimed in claim 1, wherein: the accommodating groove can be in a V shape, a U shape or other combined structures.
9. A rotor assembly as claimed in claim 1, wherein: and rotor baffles are arranged at the upper end and the lower end of the rotor.
10. An electric machine comprising a stator and a rotor, characterized in that: the rotor is a rotor assembly as claimed in any one of claims 1 to 9.
11. A compressor, includes the motor, the motor includes stator and rotor, its characterized in that: the rotor is a rotor assembly as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910723795.1A CN110380543B (en) | 2019-08-07 | 2019-08-07 | Rotor subassembly, motor, compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910723795.1A CN110380543B (en) | 2019-08-07 | 2019-08-07 | Rotor subassembly, motor, compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110380543A CN110380543A (en) | 2019-10-25 |
| CN110380543B true CN110380543B (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910723795.1A Active CN110380543B (en) | 2019-08-07 | 2019-08-07 | Rotor subassembly, motor, compressor |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768019A (en) * | 2016-06-27 | 2018-11-06 | 长泰县爱菲社机械科技有限公司 | A kind of rotor |
| CN109038897A (en) * | 2018-09-12 | 2018-12-18 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor core and the motor with it |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5359062B2 (en) * | 2008-06-30 | 2013-12-04 | 株式会社明電舎 | Rotor structure of permanent magnet rotating machine |
| JP5673438B2 (en) * | 2011-08-22 | 2015-02-18 | トヨタ自動車株式会社 | Rotor structure of rotating electrical machine |
| JP5911312B2 (en) * | 2012-01-19 | 2016-04-27 | 株式会社三井ハイテック | Manufacturing method of rotor core |
| CN103269135A (en) * | 2013-03-25 | 2013-08-28 | 杭州德沃仕电动科技有限公司 | Movable magnetic steel built-in-type permanent magnet motor rotor structure |
| CN105071568B (en) * | 2015-08-18 | 2018-05-18 | 广东美芝制冷设备有限公司 | Motor and with its compressor |
| JP6685175B2 (en) * | 2016-05-24 | 2020-04-22 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
| JP2018166377A (en) * | 2017-03-28 | 2018-10-25 | 本田技研工業株式会社 | Variable field rotary electric machine |
| CN108134463B (en) * | 2018-01-10 | 2019-09-13 | 郑州轻工业学院 | One kind is from adjustable magnetic pressure-adjusting type magneto alternator rotor structure |
-
2019
- 2019-08-07 CN CN201910723795.1A patent/CN110380543B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768019A (en) * | 2016-06-27 | 2018-11-06 | 长泰县爱菲社机械科技有限公司 | A kind of rotor |
| CN109038897A (en) * | 2018-09-12 | 2018-12-18 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor core and the motor with it |
Non-Patent Citations (1)
| Title |
|---|
| 基于有限元法的高速永磁转子强度分析;张涛;《电机与控制学报》;20120615;第16卷(第6期);第63-68页 * |
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| CN110380543A (en) | 2019-10-25 |
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