CN108566003B - Built-in radial permanent magnet rotor structure - Google Patents
Built-in radial permanent magnet rotor structure Download PDFInfo
- Publication number
- CN108566003B CN108566003B CN201710846145.7A CN201710846145A CN108566003B CN 108566003 B CN108566003 B CN 108566003B CN 201710846145 A CN201710846145 A CN 201710846145A CN 108566003 B CN108566003 B CN 108566003B
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- China
- Prior art keywords
- rotor
- permanent magnet
- section
- cage
- cage bars
- Prior art date
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- 230000005291 magnetic effect Effects 0.000 claims abstract description 38
- 238000004080 punching Methods 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 125000006850 spacer group Chemical group 0.000 claims description 17
- 230000005389 magnetism Effects 0.000 abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 22
- 229910052782 aluminium Inorganic materials 0.000 description 22
- 230000001360 synchronised effect Effects 0.000 description 12
- 238000002955 isolation Methods 0.000 description 8
- 230000004907 flux Effects 0.000 description 7
- 238000004804 winding Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The built-in radial permanent magnet rotor structure comprises a rotating shaft and rotor cores sleeved on the rotating shaft, wherein the rotor cores are formed into a whole by connecting at least 2 sections of iron core sections through cage bars and end rings, each iron core section comprises a hollow rotor section and at least 2 pairs of permanent magnets arranged on the hollow rotor section, the magnetic poles of the permanent magnets of two adjacent iron core sections are the same, and the hollow rotor section is formed by superposing a plurality of rotor punching sheets; the cage bars comprise a plurality of first cage bars and more than two second cage bars, the cross section of each first cage bar is circular, and the cross section of each second cage bar is composed of a circular part and a rectangular part connected with the circular part; the first cage bar is positioned between the round parts of the two adjacent second cage bars, and the permanent magnet is positioned between the rectangular parts of the two adjacent second cage bars. The rectangular part of the second cage bar is a magnetism isolating strip, and the magnetism isolating strip is used for isolating the left permanent magnet and the right permanent magnet, so that the traditional air gap magnetism isolating strip is replaced, and the purpose of magnetism isolating the adjacent permanent magnets is effectively achieved. The invention has the advantages of compact structure, high power density, reliable performance and long service life.
Description
Technical Field
The invention relates to a permanent magnet rotor structure.
Background
The permanent magnet synchronous motor is classified into a motor without a start winding and a motor with a start winding according to whether the start winding is provided on the rotor, the former is often called a speed-regulating permanent magnet synchronous motor, and the latter is often called an asynchronous start permanent magnet synchronous motor. The asynchronous starting permanent magnet motor can be used for speed regulation operation and can be started under certain frequency and voltage by utilizing asynchronous torque generated by a starting winding, and when the speed regulating permanent magnet motor is used in a transmission system with adjustable frequency and larger required starting torque, a speed regulating permanent magnet synchronous motor with a damping (starting) winding is formed.
The rotor magnetic circuit structure of a permanent magnet synchronous motor can be generally divided into three types according to the difference of the positions of the permanent magnets in the rotor: surface, built-in and claw pole. The permanent magnet rotor with the surface rotor magnetic circuit structure and the claw pole rotor magnetic circuit structure has simple manufacturing process, low cost and wider application, but cannot be used for asynchronously starting the permanent magnet synchronous motor because the rotor surface cannot be provided with a starting winding and has no asynchronous starting capability.
In the built-in rotor magnetic circuit structure, the permanent magnet is usually positioned in the rotor, a pole shoe made of ferromagnetic substances is arranged between the outer surface of the permanent magnet and the inner circle of the stator core, and an electric conductor is arranged in the pole shoe to play a damping and starting role, so that the dynamic and steady state performances are good, and the built-in rotor magnetic circuit structure is widely applied to permanent magnet synchronous motors with asynchronous starting capability.
The built-in rotor magnetic circuit structure can be divided into a hybrid type, a tangential type and a radial type. The magnetic circuit structure of the hybrid rotor needs to adopt more magnetism isolating magnetic bridges for magnetism isolating, the manufacturing process is complex, and the mechanical strength of the rotor punching sheet is reduced. The tangential rotor magnetic circuit structure can obtain larger magnetic flux of each pole, but the leakage coefficient is larger, and when the installation mode of axially inserting the permanent magnets is generally adopted, the radial height of the permanent magnets is limited to a certain extent due to the influence of the size of the rotor end ring, so that the volume of the motor is increased, and the manufacturing process and the manufacturing cost of the motor are higher.
The radial rotor magnetic circuit structure is characterized in that the permanent magnet is axially inserted into the permanent magnet groove, and leakage magnetic flux is limited through an air gap of the magnetism isolating magnetic bridge, so that the process is simple, but the magnetism isolating magnetic bridge occupies the space size of the punching sheet, so that the volume of the motor is increased, and the cost is increased. The smaller the width of the magnetic isolation bridge is, the more leakage magnetic flux can be limited, but the mechanical strength of the punching sheet is deteriorated, the length of the magnetic isolation bridge is ensured to be a certain size, otherwise, the magnetic isolation effect of the magnetic isolation bridge is obviously reduced. The magnetic isolation capability of the magnetic isolation bridge is inversely proportional to the mechanical strength of the rotor core, namely, the stronger the magnetic isolation capability is, the worse the mechanical strength is. Especially when the number of poles of the motor is more, the magnetism isolating magnetic bridge occupies larger size space, the mechanical strength of the rotor core is poor, meanwhile, the installation size of the radial permanent magnet is reduced, the permanent magnet cannot provide enough magnetic flux of each pole, and finally, the motor volume is increased, the cost is increased and the power density is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art of the radial structure of the built-in rotor magnetic circuit and provide the built-in radial permanent magnet rotor structure of the asynchronous starting permanent magnet synchronous motor with compact structure, high power density, reliable performance and long service life.
The technical scheme of the invention is as follows: the rotor core is formed by connecting at least 2 sections of iron core sections into a whole through cage bars and end rings, each iron core section comprises a hollow rotor section and at least 2 pairs of permanent magnets arranged on the hollow rotor section, the magnetic poles of the permanent magnets of two adjacent iron core sections are the same, and the hollow rotor section is formed by superposing a plurality of rotor punching sheets; the end rings are positioned at two ends of the rotor core, the cage bars penetrate through the rotor core, and the end rings and the cage bars fix the rotor core into a whole;
the first cage bar is circular in cross section, and the second cage bar is composed of a circular part and a rectangular part connected with the circular part; the first cage bar is positioned between the round parts of the two adjacent second cage bars, and the permanent magnet is positioned between the rectangular parts of the two adjacent second cage bars.
The first cage bars and the second cage bars are uniformly distributed.
The rotor punching sheet is provided with a rotating shaft mounting hole, a fixing rod hole I, a mounting hole I and a mounting hole II which correspond to the cage bar, the middle rotor spacer is provided with a rotating shaft mounting hole, a fixing rod hole II and mounting holes III and IV which correspond to the cage bar, and the fixing rod is inserted into the fixing rod hole I and the fixing rod hole II; the section of the first mounting hole is a circular hole part and a rectangular hole part communicated with the circular hole part, and both the circular part and the rectangular part are full of aluminum when the rotor is cast with aluminum. The section of the second mounting hole is a circular hole, the structure of the third mounting hole is identical to that of the first mounting hole, and the structure of the fourth mounting hole is identical to that of the second mounting hole. The end rings and cage bars may be made of aluminum.
The section of the permanent magnet is arc-shaped.
The rotor punching sheet is also provided with a circular arc-shaped permanent magnet mounting groove, and the permanent magnet is axially inserted into the circular arc-shaped permanent magnet mounting groove.
The rotor core both ends are equipped with tip rotor separation blade respectively, are equipped with the middle rotor separation piece between two adjacent iron core sections.
The fixed rod is inserted and mounted on the iron core section, the end rotor baffle and the middle rotor spacer.
And two ends of the fixing rod are riveted with the end rotor baffle.
According to the invention, by specially designing the sizes and the shapes of the two cast aluminum cage bars on the rotor punching sheet and the rotor spacer, after rotor cast aluminum is finished, the upper part of the second cage bar is a cylinder, the lower part is a cuboid, and the upper part and the lower part are communicated. The first cage bar is a cylinder. All cage bars play a role in improving the asynchronous starting capacity of the permanent magnet synchronous motor and increasing the starting torque during starting. The second cage bar plays a role in improving the asynchronous starting capability of the permanent magnet synchronous motor, and meanwhile, the rectangular cast aluminum bar of the second cage bar is a magnetism isolating bar, so that magnetism is isolated from the left permanent magnet and the right permanent magnet, the traditional air gap magnetism isolating is replaced, and the purpose of magnetism isolating the adjacent permanent magnets is effectively achieved. The magnetism isolating mode adopts cast aluminum to cast the cage bars and the magnetism isolating bars at the same time, so that the integral mechanical strength of the rotor core is enhanced. Meanwhile, the adjacent permanent magnets share one cast aluminum strip for magnetism isolation, so that the width and the length of each magnetism isolating magnetic bridge of the adjacent permanent magnets can be reduced, the leakage magnetic flux of the radial rotor magnetic circuit structure can be effectively reduced, the leakage magnetic coefficient is reduced, a larger installation space is provided for the permanent magnets, and the power density of the motor is improved. The mechanical strength of the permanent magnet rotor is enhanced through the design and assembly of the rotor spacer and the fixing rod. The radial permanent magnet rotor structure compresses the rotor core into a solid body through the cast aluminum end ring and the cast aluminum cage bars, and the structure increases the starting torque of the motor by increasing the friction force between the segmented rotor punching sheets and the rotor spacer to overcome the centrifugal force of the rotor punching sheets and the permanent magnets when the rotor rotates, thereby improving the starting performance of the motor and being suitable for the load working condition requiring large starting torque. The iron core is tensioned by the fixing rod, so that the mechanical strength of the rotor is enhanced, and meanwhile, the structure is simple and the installation is convenient.
Drawings
Fig. 1 is a schematic view of a rotor sheet.
Fig. 2 is a schematic view of a rotor spacer.
Fig. 3 is a schematic structural view of the rotor core.
Fig. 4 is a cross-sectional view of fig. 3.
Fig. 5 is a schematic structural view of the present invention.
Detailed Description
In fig. 1, four built-in radial permanent magnet slots are arranged on a rotor punching sheet 3, 16 circular cage bar holes and 4 special-shaped cage bar holes are uniformly distributed on the outer circle, the upper part of the 4 special-shaped cage bar holes is circular, the lower part of the 4 special-shaped cage bar holes is rectangular, and the upper part and the lower part of the 4 special-shaped cage bar holes are communicated. The structure designs the 4 rectangular magnetism isolating magnetic bridges and the round cage bars into a whole, can provide larger permanent magnet space, improves the power density of the motor, simultaneously casts the cage bars and the magnetism isolating bars at one time during aluminum casting, reduces the process flow and enhances the mechanical strength of the rotor core. Four round holes are uniformly distributed in the middle of the punching sheet and are used for fixing the rotor punching sheet 3 and the rotor spacer 2 into a whole through the fixing rod 4, and the mechanical strength of the rotor core 10 is enhanced. The rotor punching sheet 3 is made of ferromagnetic materials with good magnetic conductivity.
In fig. 2, 16 circular cage bar holes and 4 special-shaped cage bar holes are uniformly distributed on the outer circle of the rotor spacer 2, the upper part of the 4 special-shaped cage bar holes is circular, the lower part of the 4 special-shaped cage bar holes is rectangular, and the upper part and the lower part of the 4 special-shaped cage bar holes are communicated. Four round holes are uniformly distributed in the middle and are used for passing through the fixing rod 4. The rotor spacer 2 is similar to the rotor punching sheet structure, but four built-in radial permanent magnet grooves are not machined, the rotor spacer 2 is made of non-magnetic conductive materials, the rotor core 10 is isolated into two sections of rotor units, the rotor spacer 2 strengthens the strength of the rotor structure and simultaneously isolates the permanent magnets 5, the leakage magnetic flux of the radial rotor magnetic circuit structure is reduced, and the leakage magnetic flux coefficient is reduced.
In fig. 3 and 4, the rotor sheet 3 is laminated on average in two sections, each separated by the rotor spacer 2. The 20 cage bar holes in the rotor punching sheet 3 are cast aluminum cage bars, each part of the rotor becomes a firm whole through the 16 cast aluminum cage bars 1, the 4 cast aluminum cage bars 6 and the cast aluminum end ring 8 after casting aluminum is finished, the structure increases the friction force of the segmented rotor unit and the rotor spacer to overcome the centrifugal force of the rotor punching sheet and the permanent magnet when the rotor rotates, and simultaneously increases the starting torque of the motor, improves the starting performance of the motor, and is suitable for load working conditions requiring large starting torque. The permanent magnets 5 are sequentially placed in the permanent magnet slots from both ends of the rotor core 10 in the axial direction. The fixing rod 4 axially sequentially penetrates through the rotor baffle 9, the rotor iron core 10 and the rotor baffle 9, and two ends of the fixing rod are riveted with the rotor baffle 9. The structure can strengthen the mechanical strength of the rotor, is suitable for the rotor rotating at high speed, has simple structure, is convenient to install and ensures the reliable operation of the motor.
In fig. 5, the rotating shaft 7 is made of stainless steel, and the rotor core 10 is directly sleeved on the rotating shaft to form a permanent magnet rotor structure of the asynchronous starting permanent magnet synchronous motor.
The implementation process is as follows:
the rotor punching sheet 3 and the rotor spacer sheet 2 are processed according to fig. 1 and 2, and the rotor punching sheet is laminated into two sections on average according to fig. 3, and each section is separated by the rotor spacer sheet 2.
And after the lamination is completed, carrying out aluminum casting process treatment. The cage bar holes in the rotor punching sheet 3 are made of cast aluminum cage bars, and the rotor unit and the rotor spacer become a firm whole body through the cast aluminum end rings 8, 16 cast aluminum cage bars 1 and 4 cast aluminum cage bars 6 after the cast aluminum is finished.
The permanent magnets 5 are sequentially placed in the permanent magnet slots from both ends of the rotor core 10 in the axial direction.
The fixing rod 4 axially sequentially penetrates through the rotor baffle 9, the rotor iron core 10 and the rotor baffle 9, and two ends of the fixing rod are riveted with the rotor baffle 9. The fixing rod 4 is used for reinforcing the mechanical strength of the rotor, is suitable for the rotor rotating at high speed, and ensures the reliable operation of the motor.
The rotating shaft 7 is made of stainless steel, the rotor core 10 is directly sleeved on the rotating shaft, and the structure is simple, so that the permanent magnet rotor structure of the asynchronous starting permanent magnet synchronous motor is formed.
Claims (6)
1. The utility model provides a built-in radial permanent magnet rotor structure which characterized in that: the rotor core (10) is formed into a whole by connecting at least 2 sections of iron core sections through cage bars and end rings, each iron core section comprises a hollow rotor section and at least 2 pairs of permanent magnets arranged on the hollow rotor section, the magnetic poles of the permanent magnets of two adjacent iron core sections are the same, and the hollow rotor section is formed by superposing a plurality of rotor punching sheets (3); the end rings are positioned at two ends of the rotor core, the cage bars penetrate through the rotor core, and the end rings and the cage bars fix the rotor core into a whole;
the first cage bar is circular in cross section, and the second cage bar is composed of a circular part and a rectangular part connected with the circular part; the first cage bar is positioned between the round parts of the two adjacent second cage bars, and the permanent magnet is positioned between the rectangular parts of the two adjacent second cage bars;
the first cage bars and the second cage bars are uniformly distributed;
the rotor punching sheet (3) is provided with a rotating shaft mounting hole, a fixing rod hole I, a mounting hole I and a mounting hole II which correspond to the cage bars, the middle rotor spacer is provided with a rotating shaft mounting hole, a fixing rod hole II and mounting holes III and IV which correspond to the cage bars, and the fixing rod (4) is inserted into the fixing rod hole I and the fixing rod hole II; the cross section of the first mounting hole is a circular hole part and a rectangular hole part communicated with the circular hole part, the cross section of the second mounting hole is a circular hole, the structure of the third mounting hole is identical to that of the first mounting hole, and the structure of the fourth mounting hole is identical to that of the second mounting hole.
2. The built-in radial permanent magnet rotor structure according to claim 1, wherein: the section of the permanent magnet is arc-shaped.
3. The built-in radial permanent magnet rotor structure according to claim 2, wherein: the rotor punching sheet (3) is also provided with a circular arc-shaped permanent magnet mounting groove, and the permanent magnet is axially inserted into the circular arc-shaped permanent magnet mounting groove.
4. The built-in radial permanent magnet rotor structure according to claim 1, wherein: the two ends of the rotor core (10) are respectively provided with end rotor baffle plates (9), and an intermediate rotor baffle plate (2) is arranged between two adjacent core sections.
5. The built-in radial permanent magnet rotor structure according to claim 4, wherein: the fixing rod (4) is inserted on the iron core section, the end rotor baffle and the middle rotor baffle.
6. The built-in radial permanent magnet rotor structure according to claim 5, wherein: and two ends of the fixing rod (4) are riveted with end rotor baffle plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846145.7A CN108566003B (en) | 2017-09-19 | 2017-09-19 | Built-in radial permanent magnet rotor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846145.7A CN108566003B (en) | 2017-09-19 | 2017-09-19 | Built-in radial permanent magnet rotor structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108566003A CN108566003A (en) | 2018-09-21 |
| CN108566003B true CN108566003B (en) | 2024-03-15 |
Family
ID=63529254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710846145.7A Active CN108566003B (en) | 2017-09-19 | 2017-09-19 | Built-in radial permanent magnet rotor structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108566003B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114915066B (en) * | 2022-05-30 | 2023-01-13 | 河南黄河旋风股份有限公司 | Permanent magnet motor rotor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009060438A1 (en) * | 2009-12-22 | 2011-06-30 | KSB Aktiengesellschaft, 67227 | Rotor with short-circuit cage |
| CN104184284A (en) * | 2014-01-25 | 2014-12-03 | 赵晓东 | Double-magnetic-circuit asynchronous-starting permanent magnet synchronous motor rotor |
| CN205356108U (en) * | 2016-01-22 | 2016-06-29 | 尚勤贵 | Self -starting permanent magnet synchronous motor's rotor |
| 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 |
-
2017
- 2017-09-19 CN CN201710846145.7A patent/CN108566003B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009060438A1 (en) * | 2009-12-22 | 2011-06-30 | KSB Aktiengesellschaft, 67227 | Rotor with short-circuit cage |
| CN104184284A (en) * | 2014-01-25 | 2014-12-03 | 赵晓东 | Double-magnetic-circuit asynchronous-starting permanent magnet synchronous motor rotor |
| CN205356108U (en) * | 2016-01-22 | 2016-06-29 | 尚勤贵 | Self -starting permanent magnet synchronous motor's rotor |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108566003A (en) | 2018-09-21 |
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