CN111509883A - Rotor assembly and axial magnetic field motor - Google Patents
Rotor assembly and axial magnetic field motor Download PDFInfo
- Publication number
- CN111509883A CN111509883A CN201910099208.6A CN201910099208A CN111509883A CN 111509883 A CN111509883 A CN 111509883A CN 201910099208 A CN201910099208 A CN 201910099208A CN 111509883 A CN111509883 A CN 111509883A
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- Prior art keywords
- magnetic
- magnetic steel
- rotor
- rotor core
- back iron
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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)
Abstract
The invention discloses a rotor assembly and an axial magnetic field motor, which comprise a magnetic back iron, a rotor iron core, a high-strength hoop and magnetic steel; the high-strength hoop is positioned on the periphery of the rotor core, and the rotor core is arranged on the magnetic back iron; the end face of the rotor core is provided with a first groove extending along the radial direction of the rotor core, the end face of the magnetic back iron is provided with a second groove extending along the radial direction of the magnetic back iron, the first groove and the second groove are butted to form a magnetic steel groove, magnetic steel is embedded into the magnetic steel groove, the magnetic steel groove is 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 rotor iron core, a high-strength hoop and magnetic steel; wherein the high strength hoop is located at the outer periphery of the rotor core, the rotor core being disposed on the magnetic back iron; a first groove extending along the radial direction of the rotor core is formed in the end face of the rotor core, a second groove extending along the radial direction of the magnetic back iron is formed in the end face of the magnetic back iron, the first groove and the second groove are in butt joint to form a magnetic steel groove, the magnetic steel is embedded into the magnetic steel groove, the magnetic steel grooves are P groups, 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 present invention, a first magnetic isolation bridge is disposed on one side of the rotor core, which is located in the first groove, in an axial direction of the rotor core.
In one embodiment of the invention, the rotor core is formed by punching or winding.
In one embodiment of the invention, the rotor core is formed by processing silicon steel sheets, amorphous alloys or integrally molded magnetic powder metallurgy.
In one embodiment of the present invention, the rotor core is fixed to the magnetic back iron by bolts.
In one embodiment of the invention, in the axial direction of the magnetic back iron, the magnetic back iron is provided with a second magnetic isolation bridge at one side of the second groove.
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 present invention, the magnetic back iron and the high-strength hoop 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, 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 an exploded view of a rotor assembly according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of a rotor assembly according to an embodiment of the present invention;
fig. 4 is a partially enlarged perspective view illustrating a rotor assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view of a rotor assembly according to an embodiment of the present invention;
fig. 6 is a schematic magnetic steel arrangement diagram of a 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, 500 is a magnetic steel groove, 101 is a second groove, 102 is a second magnetism isolating bridge, 301 is a first groove, and 302 is a first magnetism isolating bridge;
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 6, the rotor assembly according to the embodiment of the present invention includes a magnetic back iron 100, a rotor core 300, a high-strength hoop 200, and a magnetic steel 400; wherein the high-strength hoop 200 is located at the outer circumference of the rotor core 300, and the rotor core 300 is disposed on the magnetic back iron 100; the end face of the rotor core 300 is provided with a first groove 301 extending along the radial direction of the rotor core 300, the end face of the magnetic back iron 100 is provided with a second groove 101 extending along the radial direction of the magnetic back iron 100, the first groove 301 and the second groove 101 are butted to form a magnetic steel groove 500, magnetic steel 400 is embedded into the magnetic steel groove 500, the magnetic steel grooves 500 are P groups, the magnetizing direction of the magnetic steel 400 in each group of magnetic steel grooves 500 is the tangential direction of the rotor core 300, and the magnetizing direction f3 is perpendicular to the air gap direction f 1; the magnetizing directions f3 of the magnetic steels 400 in the two adjacent groups of magnetic steel grooves 500 are opposite.
When the rotor assembly of the present invention is used, the magnetic steel 400 is inserted into the magnetic steel groove 500 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 500 is composed of at least one magnetic steel 400, the magnetizing directions f3 of the magnetic steels 400 in each group of magnetic steel slots 500 are the same, the magnetizing directions f3 of the magnetic steels 400 in two adjacent groups of magnetic steel slots 500 are opposite, the magnetic fields of the adjacent 2 groups of magnetic steels 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 steels 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 500 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 500 are the same.
Referring to fig. 5 and 6, in the embodiment of the present invention, there are 8 groups of magnetic steel slots 500, each group of magnetic steel slots 500 includes 2 magnetic steels 400, and the magnetizing directions f3 of the magnetic steels 400 in each group of magnetic steel slots 500 are the same, that is, the magnetic steel directions f2 of the two magnetic steels 400 in each group of magnetic steel slots 500 are arranged along the circumferential direction of the rotor core, N-S, or S-N. The magnetizing directions f3 of the magnetic steels 400 in the two adjacent groups of magnetic steel slots 500 are opposite, and in the circumferential direction of the rotor core, 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 500 is S-N, the magnetic steel direction f2 of the magnetic steel 400 in the adjacent group of magnetic steel slots is S-N, and the magnetizing direction f3 of the group of magnetic steel slots 500 is N-S. The magnetic fields of the adjacent 2 groups of magnetic steels 400 together form one magnetic pole of the rotor assembly, and the magnetic field directions of the magnetic steels 400 and the rotor core 300 are f 1.
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
Tem＝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 shape of the magnetic steel 400 in the embodiment of the present invention is an elongated structure, but the shape of the magnetic steel 400 claimed in the present invention is not limited to the elongated structure, and a structure in which the magnetic steel 400 can be embedded into the magnetic steel groove 500 is within the protection scope of the present invention.
In another embodiment of the present invention, the rotor core 300 is provided with a first magnetic isolation bridge 302 at a side of the first groove 301 in the axial direction of the rotor core 300. On the premise of satisfying the mechanical strength of rotor core 300, the axial width of the magnetic isolation bridge should be as small as possible. The magnetic isolation bridge has the function of avoiding magnetic flux leakage of the magnetic steel 400 in the tangential direction of the iron core.
In one embodiment of the present invention, rotor core 300 is formed through a punching or winding process. Further, the rotor core 300 is metallurgically processed from silicon steel sheets, amorphous alloys, or integrally molded magnetic powder.
The rotor core 300 is fixed to the magnetic back iron 100 by bolts. The rotor core 300 is provided with fixing holes between each set of the magnetic steel slots 500, and the rotor core 300 is fixed to the magnetic back iron 100 by installing bolts in the fixing holes.
The magnetic back iron 100 is made of a magnetically permeable steel 300, 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 magnetic back iron 100 is provided with a second magnetic isolation bridge 102 at a side located at the second groove 101 in the axial direction of the magnetic back iron 100. The axial width of the second magnetic isolation bridge 102 should be as small as possible to satisfy the mechanical strength of the magnetic back iron 100. The second magnetic isolation bridge 102 is used for preventing the magnetic steel 400 from generating magnetic flux leakage in the tangential direction of the magnetic back iron 100.
In one embodiment of the present invention, the magnetic back iron 100 and the high-strength hoop 200 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 (10)
1. A rotor assembly is characterized by comprising a magnetic back iron, a rotor iron core, a high-strength hoop and magnetic steel; wherein the high strength hoop is located at the outer periphery of the rotor core, the rotor core being disposed on the magnetic back iron; a first groove extending along the radial direction of the rotor core is formed in the end face of the rotor core, a second groove extending along the radial direction of the magnetic back iron is formed in the end face of the magnetic back iron, the first groove and the second groove are in butt joint to form a magnetic steel groove, the magnetic steel is embedded into the magnetic steel groove, the magnetic steel grooves are P groups, 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 rotor core is provided with a first magnetic isolation bridge at a side of the first groove in an axial direction of the rotor core.
3. The rotor assembly of claim 2 wherein the rotor core is stamped or wound.
4. The rotor assembly of claim 3 wherein the rotor core is metallurgically processed from silicon steel sheet, amorphous alloy, or integrally molded magnetic powder.
5. The rotor assembly of claim 1 wherein said rotor core is bolted to said magnetic back iron.
6. The rotor assembly of claim 1 wherein the magnetic back iron is provided with a second magnetic isolation bridge on a side of the second recess in an axial direction of the magnetic back iron.
7. The rotor assembly of claim 1 wherein the magnetic back iron is metallurgically processed from low carbon steel, silicon steel, or high strength magnetically permeable powder.
8. The rotor assembly of claim 6 wherein the magnetic back iron is of one-piece or split construction with the high strength hoop.
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. 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 |
|---|---|---|---|
| CN201910099208.6A CN111509883A (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 |
|---|---|---|---|
| CN201910099208.6A CN111509883A (en) | 2019-01-31 | 2019-01-31 | Rotor assembly and axial magnetic field motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111509883A true CN111509883A (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910099208.6A Pending CN111509883A (en) | 2019-01-31 | 2019-01-31 | Rotor assembly and axial magnetic field motor |
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| CN (1) | CN111509883A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152354A (en) * | 2020-08-19 | 2020-12-29 | 沈阳工业大学 | Surface insertion type permanent magnet disc type motor rotor |
| CN113437843A (en) * | 2021-07-09 | 2021-09-24 | 浙江盘毂动力科技有限公司 | Rotor structure based on neodymium iron boron magnetic steel and manufacturing method |
| WO2022252046A1 (en) * | 2021-05-31 | 2022-12-08 | 华为数字能源技术有限公司 | Electric motor rotor, drive electric motor and electric vehicle |
-
2019
- 2019-01-31 CN CN201910099208.6A patent/CN111509883A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152354A (en) * | 2020-08-19 | 2020-12-29 | 沈阳工业大学 | Surface insertion type permanent magnet disc type motor rotor |
| CN112152354B (en) * | 2020-08-19 | 2023-01-13 | 沈阳工业大学 | Surface insertion type permanent magnet disc type motor rotor |
| WO2022252046A1 (en) * | 2021-05-31 | 2022-12-08 | 华为数字能源技术有限公司 | Electric motor rotor, drive electric motor and electric vehicle |
| CN113437843A (en) * | 2021-07-09 | 2021-09-24 | 浙江盘毂动力科技有限公司 | Rotor structure based on neodymium iron boron magnetic steel and manufacturing method |
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