CN111509882A - Rotor assembly and axial magnetic field motor - Google Patents
Rotor assembly and axial magnetic field motor Download PDFInfo
- Publication number
- CN111509882A CN111509882A CN201910098121.7A CN201910098121A CN111509882A CN 111509882 A CN111509882 A CN 111509882A CN 201910098121 A CN201910098121 A CN 201910098121A CN 111509882 A CN111509882 A CN 111509882A
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- magnetic
- magnetic steel
- rotor assembly
- back iron
- rotor
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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
-
- 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
- H02K1/2793—Rotors axially facing stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a rotor assembly and an axial magnetic field motor, which comprise a magnetic back iron, a plurality of rotor cores, a high-strength hoop and a plurality of magnetic steels, wherein the magnetic back iron is arranged on the rotor core; the end face of the magnetic back iron is provided with a plurality of iron core dovetail grooves arranged along the circumferential direction and a plurality of magnetic steel grooves extending along the radial direction of the magnetic back iron, the plurality of rotor iron cores are respectively arranged in the iron core dovetail grooves, and the magnetic steel is embedded into the magnetic steel grooves; the high-strength hoop is sleeved on the peripheral surface of the magnetic back iron and is abutted against the magnetic steel grooves, the magnetic steel grooves are P groups, the magnetizing direction of the magnetic steel in each group of magnetic steel grooves is the tangential direction of the rotor core, and the magnetizing direction is vertical to the air gap direction; the magnetizing directions of the magnetic steels in the two adjacent groups of magnetic steel grooves are opposite. Because the magnetic steel is embedded into the magnetic steel grooves on the circumferential surface of the rotor core, the magnetic steel is positioned in the axial direction, and the high-strength hoop is arranged on the circumferential surface to position the magnetic steel in the radial direction. Compared with the prior art, the rotor assembly provided by the invention has the advantage that the reliability is obviously improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor assembly and an axial magnetic field motor.
Background
Radial field motors and axial field motors (also called disc motors) are two technical branches of the field of motors. The radial magnetic field motor is the vast majority in the market at present. With the breakthrough of new materials and new processes, disc motors are beginning to grow slowly. The disk motor is particularly suitable for occasions with strict requirements on the volume and the weight of the motor due to higher iron core utilization rate, higher power density and higher torque density.
Referring to fig. 1, fig. 1 is an exploded view of a rotor assembly according to the prior art.
The rotor assembly includes: the rotor assembly is composed of a rotor back plate 100', magnetic steel 200' and a surface iron core 300', and the surface iron core 300' is bonded to the magnetic steel 200 'and the rotor back plate 100' through glue. On the one hand, there is huge axial magnetic pull between the surperficial iron core of stator core and rotor, and on the other hand, rotor when high-speed rotatory, magnet steel and rotor surface iron core can receive huge centrifugal force. The mechanical reliability of the rotor of this structure is poor.
Therefore, how to improve the reliability of the rotor assembly is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is how to improve the reliability of the rotor assembly, and therefore, the present invention provides a rotor assembly and an axial magnetic field motor.
In order to achieve the purpose, the invention provides the following technical scheme:
a rotor assembly comprises a magnetic back iron, a plurality of rotor cores, a high-strength hoop and a plurality of magnetic steels; the end face of the magnetic back iron is provided with a plurality of iron core dovetail grooves arranged along the circumferential direction and a plurality of magnetic steel grooves extending along the radial direction of the magnetic back iron, the plurality of rotor iron cores are respectively arranged in the iron core dovetail grooves, and the magnetic steel is embedded into the magnetic steel grooves; the high-strength hoop is sleeved on the peripheral surface of the magnetic back iron and is abutted against the magnetic steel grooves, the number of the magnetic steel grooves is P, the magnetizing direction of the magnetic steel in each group of the magnetic steel grooves is the tangential direction of the rotor core, and the magnetizing direction is perpendicular to the air gap direction; and the magnetizing directions of the magnetic steels in the two adjacent groups of magnetic steel grooves are opposite.
In one embodiment of the invention, the end face of the magnetic back iron provided with the iron core dovetail groove is provided with a first magnetic steel notch corresponding to the magnetic steel groove.
In one embodiment of the invention, a second magnetic steel notch corresponding to the magnetic steel groove is formed in the end face of the magnetic back iron, which is not provided with the iron core dovetail groove.
In one embodiment of the invention, the magnetic steel slot and the iron core dovetail slot are arranged on the magnetic back iron at intervals.
In one embodiment of the invention, the magnetic back iron is formed by metallurgically processing low-carbon steel, silicon steel or high-strength magnetic powder.
In one embodiment of the invention, the magnetic steel groove is arranged on the outer peripheral surface of the magnetic back iron, and the notch of the magnetic steel groove is positioned on the outer peripheral surface of the magnetic back iron.
In one embodiment of the invention, when the magnetic steel slot is arranged on the end face of the magnetic back iron, the magnetic steel slot is a magnetic steel dovetail slot, and the magnetic steel is clamped in the magnetic steel dovetail slot.
In one embodiment of the present invention, the high-strength hoop and the magnetic back iron are an integrated structure or a split structure.
In one embodiment of the present invention, the high-strength hoop is made of high-strength carbon fiber, high-strength glass fiber or titanium alloy high-strength metal.
In one embodiment of the invention, the rotor core is formed by processing a stamped and laminated silicon steel sheet or amorphous alloy or integrally molded magnetic powder metallurgy.
In one embodiment of the present invention, the magnetic steel has a strip structure or a sector structure.
In one embodiment of the invention, an axial magnetic field motor is further disclosed, which comprises the rotor assembly as described in any one of the above.
According to the technical scheme, when the rotor assembly is adopted, the magnetic steel is embedded into the magnetic steel grooves on the peripheral surface of the rotor core, the magnetic steel is positioned in the axial direction, and the high-strength hoop is arranged on the peripheral surface to position the magnetic steel in the radial direction. It can be seen that the rotor assembly of the present invention has significantly improved reliability over the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an exploded view of a rotor assembly according to the prior art;
fig. 2 is a front exploded view of a rotor assembly according to an embodiment of the present invention;
fig. 3 is a rear exploded view of a rotor assembly according to an embodiment of the present invention;
fig. 4 is a schematic perspective view illustrating a rotor assembly according to an embodiment of the present invention;
fig. 5 is a partially enlarged perspective view illustrating a rotor assembly according to an embodiment of the present invention;
FIG. 6 is a schematic view of a rotor assembly according to an embodiment of the present invention;
fig. 7 is a schematic magnetic steel arrangement diagram of a rotor assembly according to an embodiment of the present invention;
fig. 8 is a front exploded view of a further rotor assembly according to an embodiment of the present invention;
fig. 9 is a schematic perspective view illustrating a further rotor assembly according to an embodiment of the present invention;
fig. 10 is a partially enlarged perspective view illustrating a further rotor assembly according to an embodiment of the present invention;
in the figure, 100 is a magnetic back iron, 200 is a high-strength hoop, 300 is a rotor core, 400 is a magnetic steel, 101 is a core dovetail groove, 102 is a magnetic steel groove, 103 is a first magnetic steel notch, and 104 is a second magnetic steel notch;
100' is rotor back plate, 200' is magnetic steel, 300' is surface iron core.
Detailed Description
The core of the invention is to provide a rotor assembly and an axial magnetic field motor so as to improve the reliability of the rotor assembly.
The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
Referring to fig. 2 to 10, the rotor assembly according to the embodiment of the present invention includes a magnetic back iron 100, a plurality of rotor cores 300, a high-strength hoop 200, and a plurality of magnetic steels 400; the end face of the magnetic back iron 100 is provided with a plurality of iron core dovetail grooves 101 arranged along the circumferential direction and a plurality of magnetic steel grooves 102 extending along the radial direction of the magnetic back iron 100, the plurality of rotor cores 300 are respectively arranged in the iron core dovetail grooves 101, and the magnetic steel 400 is embedded into the magnetic steel grooves 102; the high-strength hoop 200 is sleeved on the outer peripheral surface of the magnetic back iron 100 and is abutted against the magnetic steel grooves 102, the magnetic steel grooves 102 are P groups, the magnetizing direction of the magnetic steel 400 in each group of magnetic steel grooves 102 is the tangential direction of the rotor core 300, and the magnetizing direction is perpendicular to the air gap direction f 1; the magnetizing directions of the magnetic steels 400 in the two adjacent groups of magnetic steel grooves 102 are opposite.
When the rotor assembly of the present invention is used, the magnetic steel 400 is inserted into the magnetic steel groove 102 on the circumferential surface of the rotor core 300, the magnetic steel 400 is positioned in the axial direction, and the magnetic steel 400 is positioned in the radial direction by providing the high-strength hoop 200 on the circumferential surface. Therefore, compared with the prior art, the rotor assembly provided by the invention has the advantages that the mechanical structure of the rotor assembly is stable and reliable, the influence of axial magnetic tension can be borne, and the influence of the rotating centrifugal force of the rotor can be overcome.
It should be noted that P is the number of magnetic poles of the rotor assembly, each group of magnetic steel slots 102 is composed of at least one magnetic steel 400, the magnetizing directions f3 of the magnetic steel 400 in each group of magnetic steel slots 102 are the same, the magnetizing directions f3 of the magnetic steel 400 in two adjacent groups of magnetic steel slots 102 are opposite, the magnetic fields of the adjacent 2 groups of magnetic steel 400 jointly form one magnetic pole of the rotor assembly, and the magnetic field of the air gap pointed by each pole is formed by the magnetic field polymerization of the adjacent magnetic steel 400, that is, the air gap direction f1 is the magnetic field direction and extends along the radial direction of the rotor core 300. The magnetizing directions f3 of the magnetic steels 400 in each group of magnetic steel slots 102 are the same, and it can be specifically understood that the magnetic steel directions f2 of all the magnetic steels 400 arranged in each group of magnetic steel slots 102 are the same.
Referring to fig. 6 and 7, in the embodiment of the present invention, there are 8 groups of magnetic steel slots 102, each group of magnetic steel slots 102 includes 3 magnetic steels 400, and the magnetizing directions f3 of the magnetic steels 400 in each group of magnetic steel slots 102 are the same, that is, the magnetic steel directions f2 of the two magnetic steels 400 in each group of magnetic steel slots 102 are arranged along the circumferential direction of the rotor core 300, and are N-S or S-N. The magnetizing directions f3 of the magnetic steels 400 in the two adjacent groups of magnetic steel slots 102 are opposite, and in the circumferential direction of the rotor core 300, if the magnetic steel direction f2 of the magnetic steel 400 is N-S and the magnetizing direction f3 of the group of magnetic steel slots 102 is S-N, the magnetic steel direction f2 of the magnetic steel 400 in the adjacent group of magnetic steel slots 102 is S-N, and the magnetizing direction f3 of the group of magnetic steel slots 102 is N-S.
Since the magnetic steel 400 is embedded in the rotor core 300, the distance between the stator core and the rotor core 300 can be greatly reduced compared to most of the surface-mounted magnetic steels 400, and thus, the inductance (d-axis inductance and q-axis inductance) of the motor can be greatly increased. When the motor carries out field weakening control at high speed, when neglecting the influence of motor stator resistance, the highest ideal rotational speed that the motor can reach is:
wherein p is the number of pole pairs of the motor, psifFor rotor flux linkage, LdAnd u and i are input voltage and input current of the motor respectively.
It can be seen from the formula (1) that, under the same voltage, when the d-axis inductance of the motor is increased, the required current can be obviously reduced, or the highest flux weakening rotation speed of the motor which can be reached can be obviously improved.
In addition, since the magnetic steel 400 is inserted into the rotor core 300 in an embedded manner, and the magnetization direction f3 of the magnetic steel 400 is a tangential direction of the rotor core 300. With the embedded magnet steel 400 arrangement, the d-axis magnetic circuit of the rotor passes through the corresponding embedded magnet steel 400, and the q-axis magnetic circuit does not pass through the magnet steel 400 but is entirely closed by the rotor core 300. Therefore, the d-axis magnetic circuit and the q-axis magnetic circuit of the rotor are asymmetric, and the d-axis inductance < the q-axis inductance according to the formula
Τem＝p·[ψfiq+(Ld-Lq)idiq](2)
Wherein p is the number of pole pairs of the motor, psifFor rotor flux linkage iqAnd iqThe d-axis current and the q-axis current, respectively, therefore, the reluctance torque component of the latter half of the above equation (2) (the first half being the permanent magnet torque component) is added to the torque of the motor, thereby increasing the torque density of the motor, L in most axial field motorsd＝LqTherefore, the rotor assembly adopting the structure of the embodiment of the invention does not generate reluctance torque.
The magnetic back iron 100 is made of a magnetically permeable steel 400300, which may be low carbon steel, silicon steel (note that it is not a silicon steel sheet, but a thick silicon steel sheet), or other high strength magnetically permeable powder metallurgy. The magnetic back iron 100 has both magnetic permeability and structural properties. Because the strength of the material for manufacturing the magnetic back iron 100 is high, the manufactured whole rotor assembly has enough strength to bear, so that large axial deformation is not easy to occur under the action of huge axial magnetic pulling force between the stator assembly and the rotor assembly.
In another embodiment of the present invention, the end surface of the magnetic back iron 100 provided with the iron core dovetail groove 101 is provided with a first magnetic steel notch 103 corresponding to the magnetic steel slot 102. The width of the first magnetic steel notch 103 is smaller than that of the magnetic steel slot 102. The magnetic steel 400 mainly has the function of reducing the magnetic leakage in the magnetic back iron 100. In addition, the smaller first magnetic steel notch 103 also plays a role in axially positioning the magnetic steel 400.
In another embodiment of the present invention, the end surface of the magnetic back iron 100 not provided with the iron core dovetail groove 101 is provided with a second magnetic steel notch 104 corresponding to the magnetic steel slot 102. The width of the second magnetic steel notch 104 is smaller than the width of the magnetic steel slot 102. The magnetic steel 400 mainly has the function of reducing the magnetic leakage in the magnetic back iron 100. In addition, the second smaller magnetic steel notch 104 also serves to axially position the magnetic steel 400.
In order to improve the uniformity of the magnetic field on rotor core 300. On the magnetic back iron 100, magnetic steel slots 102 and iron core dovetail slots 101 are arranged at intervals. In the embodiment of the invention, two groups of magnetic steel slots 102 are provided with a core dovetail slot 101 at intervals. And is not limited to this configuration.
In the embodiment of the present invention, the magnetic steel groove 102 extends along the radial direction of the magnetic back iron 100, the magnetic steel groove 102 is disposed on the outer circumferential surface of the magnetic back iron 100, and the notch of the magnetic steel groove 102 is located on the outer circumferential surface of the magnetic back iron 100. During mounting, the magnetic back iron 100 is gradually pushed into the magnetic steel groove 102 from the outer peripheral surface thereof, as shown in fig. 2 to 7.
In another embodiment of the present invention, the magnetic steel slot 102 is disposed on an end surface of the magnetic back iron 100, and at this time, the magnetic steel slot 102 is a magnetic steel 400 dovetail slot, and the magnetic steel 400 is clamped in the magnetic steel 400 dovetail slot, as shown in fig. 8 to 10.
In the embodiment of the present invention, the shape of the magnetic steel 400 is a strip-shaped structure or a fan-shaped structure, wherein in fig. 2 to 7, the magnetic steel 400 is a strip-shaped structure, and three magnetic steels 400 are embedded in each group of magnetic steel slots 102; in fig. 8 to 10, the magnetic steel 400 is a sector structure, and one magnetic steel 400 is embedded in each group of magnetic steel slots 102. However, the shape of the magnetic steel 400 claimed in the present invention is not limited to the strip structure or the fan structure, and any structure that can insert the magnetic steel 400 into the magnetic steel slot 102 is within the protection scope of the present invention.
In one embodiment of the present invention, the rotor core 300 is metallurgically processed from stamped and laminated silicon steel sheets or amorphous alloys, or integrally molded magnetic powder. The rotor core 300 has a dovetail bevel edge at a side edge thereof to be fitted to the core dovetail groove 101, and the rotor core 300 is fixed in the axial direction by the core dovetail groove 101. The rotor core 300 has a segmented structure, and the positions of the rotor core 300 and the core dovetail groove 101 are located on the center line of each magnetic pole of the rotor core 300, and the number of the rotor cores is the same as the number of the rotor magnetic poles. The rotor core 300 is formed of silicon steel or an amorphous lamination structure in order to reduce eddy current loss on the surfaces of the respective poles of the rotor.
In one embodiment of the present invention, the high-strength hoop 200 and the magnetic back iron 100 are an integral structure. The magnetic back iron 100 and the high-strength hoop 200 are integrated together, and are made of the same material as the magnetic back iron 100 and are integrally processed.
In one embodiment of the present invention, the high-strength hoop 200 and the magnetic back iron 100 are a split structure. At this time, in order to further improve the strength of the entire rotor assembly, the high-strength hoop 200 is processed from a high-strength carbon fiber, a high-strength glass fiber, or a titanium alloy high-strength metal.
The invention also discloses an axial magnetic field motor comprising the rotor assembly as described in any one of the above. Because above-mentioned rotor subassembly has above beneficial effect, including the axial magnetic field motor of above-mentioned rotor subassembly also has corresponding effect, and this is no longer repeated here.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A rotor assembly is characterized by comprising a magnetic back iron, a plurality of rotor cores, a high-strength hoop and a plurality of magnetic steels; the end face of the magnetic back iron is provided with a plurality of iron core dovetail grooves arranged along the circumferential direction and a plurality of magnetic steel grooves extending along the radial direction of the magnetic back iron, the plurality of rotor iron cores are respectively arranged in the iron core dovetail grooves, and the magnetic steel is embedded into the magnetic steel grooves; the high-strength hoop is sleeved on the peripheral surface of the magnetic back iron and is abutted against the magnetic steel grooves, the number of the magnetic steel grooves is P, the magnetizing direction of the magnetic steel in each group of the magnetic steel grooves is the tangential direction of the rotor core, and the magnetizing direction is perpendicular to the air gap direction; and the magnetizing directions of the magnetic steels in the two adjacent groups of magnetic steel grooves are opposite.
2. The rotor assembly of claim 1, wherein the magnetic back iron is provided with a first magnetic steel notch corresponding to the magnetic steel groove on the end surface of the iron core dovetail groove.
3. The rotor assembly of claim 2, wherein the end surface of the magnetic back iron not provided with the iron core dovetail groove is provided with a second magnetic steel notch corresponding to the magnetic steel groove.
4. The rotor assembly of claim 3 wherein said magnetic back iron has said magnetic steel slots spaced from said core dovetail slots.
5. The rotor assembly of claim 4 wherein the magnetic back iron is metallurgically processed from low carbon steel, silicon steel, or high strength magnetically permeable powder.
6. The rotor assembly of claim 5, wherein the magnetic steel groove is arranged on the outer peripheral surface of the magnetic back iron, and the notch of the magnetic steel groove is positioned on the outer peripheral surface of the magnetic back iron.
7. The rotor assembly of claim 5, wherein when the magnetic steel slot is arranged on the end face of the magnetic back iron, the magnetic steel slot is a magnetic steel dovetail slot, and the magnetic steel is clamped in the magnetic steel dovetail slot.
8. The rotor assembly of any one of claims 1 to 7 wherein the high strength hoop and the magnetic back iron are of a one-piece or a split construction.
9. The rotor assembly of claim 8 wherein the high strength hoop is machined from high strength carbon fiber, high strength glass fiber, or titanium alloy high strength metal.
10. The rotor assembly according to any one of claims 1 to 7, wherein the rotor core is processed through a silicon steel sheet or an amorphous alloy which is a punched lamination, or a magnetic powder metallurgy which is an integral molding.
11. A rotor assembly as claimed in any one of claims 1 to 7, wherein the magnetic steel is of an elongate or fan-shaped configuration.
12. An axial field machine comprising a rotor assembly according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910098121.7A CN111509882A (en) | 2019-01-31 | 2019-01-31 | Rotor assembly and axial magnetic field motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910098121.7A CN111509882A (en) | 2019-01-31 | 2019-01-31 | Rotor assembly and axial magnetic field motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111509882A true CN111509882A (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910098121.7A Pending CN111509882A (en) | 2019-01-31 | 2019-01-31 | Rotor assembly and axial magnetic field motor |
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| CN (1) | CN111509882A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953056A (en) * | 2021-01-25 | 2021-06-11 | 格力电器（武汉）有限公司 | Rotor subassembly and have its motor |
| CN113691044A (en) * | 2021-07-05 | 2021-11-23 | 湖北工业大学 | Novel axial coreless motor rotor structure and heat dissipation method thereof |
-
2019
- 2019-01-31 CN CN201910098121.7A patent/CN111509882A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953056A (en) * | 2021-01-25 | 2021-06-11 | 格力电器（武汉）有限公司 | Rotor subassembly and have its motor |
| CN113691044A (en) * | 2021-07-05 | 2021-11-23 | 湖北工业大学 | Novel axial coreless motor rotor structure and heat dissipation method thereof |
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