CN216959464U - Motor rotor and self-starting synchronous reluctance motor - Google Patents
Motor rotor and self-starting synchronous reluctance motor Download PDFInfo
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- CN216959464U CN216959464U CN202220213709.XU CN202220213709U CN216959464U CN 216959464 U CN216959464 U CN 216959464U CN 202220213709 U CN202220213709 U CN 202220213709U CN 216959464 U CN216959464 U CN 216959464U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The application provides a motor rotor and a self-starting synchronous reluctance motor. This electric motor rotor includes rotor core, last magnetic barrier groove and the central shaft hole of being provided with of rotor core, the magnetic barrier groove is including the Q axle magnetic barrier groove that is located the Q axle outside and the D axle magnetic barrier groove that is located between Q axle magnetic barrier groove and the central shaft hole and extends along the D axle direction, D axle magnetic barrier groove is including non-cast aluminium district and the cast aluminium district that is located non-cast aluminium district both ends, Q axle magnetic barrier groove and cast aluminium district pack have electrically conductive non-magnetic material, rotor core's both ends are provided with the rotor baffle, the rotor baffle has the shielding part that can shelter from non-cast aluminium district, be provided with the intercommunication magnetic barrier groove corresponding to Q axle magnetic barrier groove and cast aluminium district on the rotor baffle, the rotor baffle is provided with the end links outward, the end links at least partially cover non-cast aluminium district. According to the motor rotor, the size of the end ring can be increased, and the starting capacity of the motor is improved.
Description
Technical Field
The application relates to the technical field of motors, in particular to a motor rotor and a self-starting synchronous reluctance motor.
Background
The direct-start synchronous reluctance motor combines the structural characteristics of an induction motor and the synchronous reluctance motor, realizes starting by generating torque through cage induction, realizes constant-speed operation by generating reluctance torque through the difference of rotor inductance, and can be directly switched in a power supply to realize starting operation. Compared with a direct-start permanent magnet motor, the direct-start synchronous reluctance motor has the advantages of no rare earth permanent magnet material, no demagnetization problem, low motor cost and good reliability. Compared with an asynchronous motor, the motor has high efficiency and constant rotating speed. The direct-start synchronous reluctance motor can be started automatically, a controller is not needed for starting, and the cost is further reduced.
The self-starting motor generates starting torque by cutting a stator magnetic field through a rotor conducting bar, and the rotor conducting bar is made of an electric and non-magnetic conducting material, usually pure aluminum, and is filled in a high-pressure casting mode. After the aluminum casting, end rings are formed at two ends of the rotor to short out all or part of the conducting bars.
The rotor iron core is provided with a plurality of groups of identical air slots, and the number of the groups of the air slots is the number of rotor poles; according to the shape of the air groove, the radial direction parallel to the air groove is called D axis, and the radial direction perpendicular to the air groove is called Q axis; the air groove is divided into a plurality of layers along the axis Q; each layer of air groove is divided into a D-axis cast aluminum groove, a Q-axis cast aluminum groove and a non-cast aluminum groove; the cast aluminum groove and the non-cast aluminum groove are separated by an inner magnetic bridge; the air slot and the outer circle of the rotor are separated by an outer magnetic bridge.
The end ring structure is limited to avoid the end ring aluminum liquid entering the non-cast aluminum groove in the aluminum casting process due to the influence of the arrangement position of the non-cast aluminum groove, so that the end ring only carries out aluminum casting in the area where the cast aluminum groove is located and avoids the area where the non-cast aluminum groove is located, the size of the end ring is limited, and the starting capability of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
Therefore, an object of the present invention is to provide a motor rotor and a self-starting synchronous reluctance motor, which can increase the volume of an end ring and improve the starting capability of the motor.
In order to solve the problem, the application provides a motor rotor, including rotor core, last magnetic barrier groove and the central shaft hole of being provided with of rotor core, magnetic barrier groove is including being located the Q axle magnetic barrier groove in the Q axle outside and being located between Q axle magnetic barrier groove and the central shaft hole and along the D axle magnetic barrier groove of D axle direction extension, D axle magnetic barrier groove is including non-cast aluminium district and the cast aluminium district that is located non-cast aluminium district both ends, Q axle magnetic barrier groove and cast aluminium district fill have electrically conductive non-magnetic material, rotor core's both ends are provided with the rotor baffle, the rotor baffle has the shielding portion that can shelter from non-cast aluminium district, be provided with the continuous magnetic barrier groove corresponding to Q axle magnetic barrier groove and cast aluminium district on the rotor baffle, the rotor baffle is provided with the end links outward, the end links at least partially cover non-cast aluminium district.
Preferably, the edge of the communicating barrier groove disposed corresponding to the D-axis barrier groove near the Q-axis is aligned with the edge of the non-cast aluminum region far from the Q-axis.
Preferably, a tooling hole which axially penetrates through the rotor core is arranged between the cast aluminum area and the non-cast aluminum area, and the tooling hole axially penetrates through the rotor baffle and the end ring.
Preferably, the cast aluminum zone and the non-cast aluminum zone are separated by a tool hole.
Preferably, the tooling holes are symmetrical about the axis Q, the distance between the inner edge of the tooling hole close to the axis Q and the axis Q is Lmn, the width of the tooling hole along the axis Q is Wmn, Lmn is more than or equal to Wmn, and n is the number of layers of the D-axis magnetic barrier grooves along the axis Q from the axis D.
Preferably, the outer diameter of the rotor iron core is Dr, and the distance Lmn between the inner edge of the tool hole close to the shaft Q and the shaft Q meets the requirement
Preferably, the outer diameter of the rotor iron core is Dr, and the width Wmn of the tool hole along the Q-axis direction meets the requirement
Preferably, the rotor core has a height H, the end rings have an axial height HT,
preferably, the central axial bore has a diameter Dsft, the rotor core has an outer diameter Dr, the end rings have an outer diameter D,
and is
Preferably, the end ring has a one-sided radial width W3, the central axial bore of the rotor core has a diameter Dsft, and the rotor core has an outer diameter Dr, wherein
According to another aspect of the present application, there is provided a self-starting synchronous reluctance motor comprising a motor rotor as described above.
The application provides a motor rotor, including rotor core, last magnetic barrier groove and the central axis hole of being provided with of rotor core, magnetic barrier groove is including the Q axle magnetic barrier groove that is located the Q axle outside and the D axle magnetic barrier groove that is located between Q axle magnetic barrier groove and the central axis hole and extends along the D axle direction, D axle magnetic barrier groove is including non-cast aluminium district and the cast aluminium district that is located non-cast aluminium district both ends, Q axle magnetic barrier groove and cast aluminium district pack have electrically conductive non-magnetic material, rotor core's both ends are provided with rotor baffle, rotor baffle has the shielding portion that can shelter from non-cast aluminium district, be provided with the continuous magnetic barrier groove corresponding to Q axle magnetic barrier groove and cast aluminium district on the rotor baffle, rotor baffle is provided with the end links outward, the end links cover non-cast aluminium district at least partially. This electric motor rotor sets up rotor baffle at rotor core's both ends, can shelter from the magnetic barrier groove in rotor core's non-cast aluminium district, consequently can utilize to support the frock and cooperate with rotor baffle when carrying out the casting of end ring, avoids casting liquid to enter into non-cast aluminium district in, can make the formation of end ring not receive the influence in the magnetic barrier groove in non-cast aluminium district simultaneously, can have great end ring volume to effectively improve the starting ability of motor.
Drawings
FIG. 1 is a schematic view of a rotor of an electric machine according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a rotor sheet of a motor rotor according to an embodiment of the present application;
FIG. 3 is a schematic view of a rotor baffle structure of a rotor of an electric machine according to an embodiment of the present application;
FIG. 4 is a schematic view of a rotor core structure of a rotor of an electric machine according to an embodiment of the present application;
FIG. 5 is a schematic longitudinal cross-sectional view of a rotor of an electric machine according to an embodiment of the present application;
FIG. 6 is a graph of the starting capability of 2Lmn/Dr for the rotor of the motor of one embodiment of the present application;
fig. 7 is a graph comparing the efficiency of a rotor of an electric machine according to an embodiment of the present application with a rotor of an electric machine having an inner magnetic bridge.
The reference numerals are represented as:
1. a rotor core; 2. a Q-axis magnetic barrier groove; 3. a D-axis magnetic barrier groove; 4. a central shaft hole; 5. an aluminum casting area; 6. a non-cast aluminum zone; 7. an end ring; 8. a rotor baffle; 9. communicating the magnetic barrier groove; 10. a tooling hole; 11. a shielding portion.
Detailed Description
Referring to fig. 1 to 7 in combination, according to an embodiment of the present application, a motor rotor includes a rotor core 1, a magnetic barrier groove and a central shaft hole 4 are disposed on the rotor core 1, the magnetic barrier groove includes a Q-axis magnetic barrier groove 2 located on an outermost side of a Q-axis and a D-axis magnetic barrier groove 3 located between the Q-axis magnetic barrier groove 2 and the central shaft hole 4 and extending in a direction of a D-axis, the D-axis magnetic barrier groove 3 includes an unmolded aluminum region 6 and cast aluminum regions 5 located at two ends of the unmolded aluminum region 6, the Q-axis magnetic barrier groove 2 and the cast aluminum regions 5 are filled with an electrically conductive and non-magnetic conductive material, rotor baffles 8 are disposed at two ends of the rotor core 1, the rotor baffles 8 have shielding portions 11 capable of shielding the unmolded aluminum region 6, a communicating magnetic barrier groove 9 is disposed on the rotor baffles 8 corresponding to the Q-axis magnetic barrier groove 2 and the cast aluminum regions 5, an end ring 7 is disposed outside the rotor baffles 8, and the end ring 7 at least partially covers the unmolded aluminum region 6. In the present embodiment, the shielding portion 11 is a flat plate structure that communicates between the magnetic barrier grooves 9 on the rotor shutter 8.
This electric motor rotor sets up rotor baffle 8 at rotor core 1's both ends, can shelter from the magnetic barrier groove of rotor core 1's non-cast aluminium district 6, consequently can be when carrying out the casting of end ring 7, utilize and support frock and rotor baffle 8 to cooperate, avoid casting liquid to enter into in the non-cast aluminium district 6, can make the formation of end ring 7 not receive the influence of the magnetic barrier groove of non-cast aluminium district 6 simultaneously, can have great end ring 7 volume, thereby effectively improve the starting ability of motor.
In one embodiment, the edge of the communicating magnetic barrier groove 9, which is arranged corresponding to the D-axis magnetic barrier groove 3 and is close to the Q-axis, is aligned with the edge of the non-cast aluminum region 6, which is far away from the Q-axis, and part of the communicating magnetic barrier groove can also be located at the radial outer side of the non-cast aluminum region 6, so that the communicating channel between the cast aluminum region 5 and the non-cast aluminum region 6 can be cut off by the cooperation of the edge of the communicating magnetic barrier groove 9 and a tool, and the conductive non-magnetic material such as aluminum liquid and the like can be effectively prevented from entering the non-cast aluminum region 6 in the aluminum casting process of the cast aluminum region 5.
In one embodiment, tooling holes 10 are provided axially through the rotor core 1 between the cast aluminum regions 5 and the non-cast aluminum regions 6, the tooling holes 10 extending axially through the rotor baffle 8 and the end rings 7. In this embodiment, the tool hole 10 axially penetrates through the whole motor rotor, including the rotor core 1, the rotor baffle 8 and the end ring 7, so that the tool can be used for replacing an inner magnetic bridge to separate a communication channel between the cast aluminum zone 5 and the non-cast aluminum zone 6 in the process of casting aluminum, the non-cast aluminum zone 6 can be prevented from entering cast aluminum, the strength of the magnetic barrier is ensured, the amount of cast aluminum is effectively reduced, and the weight of the rotor is reduced. In addition, after the tool is taken out, the end ring 7 can be reserved with a yielding hole left by the tool, so that a heat dissipation flow channel is provided, the heat dissipation capacity is improved, the using amount of a filling material is reduced, the motor is light, and the cost is reduced.
The material filled in the cast aluminum region 5 in the present application is a conductive and non-magnetic material, the cast aluminum region 5 is only named for the filled region, and is not limited to the filled material, as long as the conductive and non-magnetic material capable of being used as a conductive bar can be filled into the cast aluminum region 5, and the conductive and non-magnetic material is, for example, aluminum or red copper.
This electric motor rotor divides into cast aluminium district 5 and non-cast aluminium district 6 with D axle magnetic barrier groove 3 of rotor core 1 to pack at cast aluminium district 5 intussuseption and electrically conduct magnetic material not, make cast aluminium district 5 and non-cast aluminium district 6 intercommunication, thereby can get rid of cast aluminium district 5 and non-cast aluminium district's between the interior magnetic bridge, form the electric motor rotor who does not have interior magnetic bridge, effectively reduce the rotor magnetic leakage, improve rotor salient pole ratio, improve motor efficiency and motor performance.
The channel formed between the adjacent D-axis magnetic barrier grooves 3 is a magnetic conduction channel, and a magnetic circuit channel can be formed in the working process of the motor to allow magnetic lines of force to flow through.
The rotor core 1 is provided with a plurality of groups of air slots with the same shape as the magnetic barrier slots, and the number of the groups of the air slots is the number of the rotor poles. Each group of air grooves is divided into a plurality of layers along the axis Q, each layer of air groove only comprises one groove, each layer of air groove is adjacent to the magnetic conduction channel along the axis Q, and the outermost edge along the axis D is provided with an external magnetic bridge which is adjacent to the air gap.
Because the motor rotor in the application is not provided with the inner magnetic bridge, the shapes of the rotor conducting bar formed by filling the conductive and non-magnetic material and the end rings 7 at two ends can be flexibly adjusted, the starting capability of the motor can be adjusted to be optimal, and the starting performance of the motor is improved. Referring to fig. 7 in combination, the performance of the internal magnetic bridge-free motor of the embodiment of the present application is improved by at least 1% compared to the motor with internal magnetic bridge.
In addition, because the inner magnetic bridge is omitted, the filling material in the cast aluminum zone 5 can be used for replacing the function of the inner magnetic bridge, and the structural strength of the motor rotor can be greatly increased.
In one embodiment, the cast aluminum zone 5 and the non-cast aluminum zone 6 are spaced apart by tooling holes 10. In this embodiment, since the tooling holes 10 are used for installing tooling in the aluminum casting process, the tooling can be used as a structure for separating the aluminum casting zone 5 and the non-aluminum casting zone 6, and since the non-aluminum casting zone 6 is an air tank, and the tooling holes 10 are also air tanks after the tooling is taken out, in this case, the tooling holes 10 on the rotor core 1 can be considered to belong to the non-aluminum casting zone 6, and the aluminum casting zone 5 is directly communicated with the non-aluminum casting zone 6.
In one embodiment, the tooling holes 10 are symmetrical about the axis Q, the distance between the inner edge of the tooling hole 10 close to the axis Q and the axis Q is Lmn, the width of the tooling hole 10 along the axis Q is Wmn, Lmn is more than or equal to Wmn, and n is the number of layers of the D-axis magnetic barrier slots 3 along the axis Q from the axis D.
In one embodiment, the outer diameter of the rotor core 1 is Dr, and the distance Lmn between the inner edge of the tool hole 10 close to the Q axis and the Q axis satisfies
Taking FIG. 1 as an example, Lmn should satisfy
In one embodiment, the rotor core 1 has an outer diameter Dr, and the width Wmn of the tool hole 10 in the Q-axis direction satisfies
For the example of FIG. 1, Wmn should be satisfied
In one embodiment, the rotor core 1 has a height H, the end rings 7 have an axial height HT,
thereby, the end ring 7 has a sufficient axial height, and the resistance can be reduced to improve the starting capability. In the present embodiment, in a cross section passing through the central axis of the rotor core 1, the axial heights of the end rings 7 are HT1, HT2, HT3, and HT4 in this order, and all these axial heights satisfy the above-mentioned condition restrictions, so that the overall height of the end rings 7 can provide a larger magnetic conduction path and a smaller electric resistance, and the starting capability of the motor is improved.
In one embodiment, the central shaft bore 4 has a diameter Dsft, the rotor core 1 has an outer diameter Dr, the end rings 7 have an outer diameter D,
and is
In one embodiment, the end ring 7 is annular, the end ring 7 has a single-sided radial width W3, the central axial bore 4 of the rotor core has a diameter Dsft, and the rotor core has an outer diameter Dr, wherein
In one embodiment, the outer magnetic bridges are provided on the outer circumferential sides of the magnetic barrier slots, which can improve the structural strength of the rotor core 1.
In one embodiment, the inner ring of the end ring 7 may be circular or other shape.
In one embodiment, the outer ring of the end ring 7 may be circular or other shape.
In one embodiment, the outer magnetic bridges are provided on the outer circumferential sides of the magnetic barrier slots, which can improve the structural strength of the rotor core 1.
According to an embodiment of the application, a self-starting synchronous reluctance machine comprises a machine rotor, which is the machine rotor described above.
According to an embodiment of the application, the manufacturing method of the motor rotor includes: processing a rotor punching sheet with a Q-axis magnetic barrier groove 2 and a D-axis magnetic barrier groove 3; processing a rotor baffle plate 8 with a communication magnetic barrier groove 9 and a shielding part 11 for shielding a non-cast aluminum area; superposing the rotor punching sheets into a rotor core 1, and installing rotor baffles 8 at two ends of the rotor core 1, so that a communicated magnetic barrier groove 9 of each rotor baffle 8 is aligned with a cast aluminum zone 5 of the rotor core 1, and a tooling hole 10 is formed between a shielding part 11 of each rotor baffle 8 and the cast aluminum zone of the rotor core; inserting the supporting tool into the tool hole 10; filling conductive non-magnetic materials into the cast aluminum area 5 of the rotor core 1, the Q-axis magnetic barrier groove 2 and the communicating magnetic barrier groove 9 of the rotor baffle plate 8, forming an end ring 7 on the axial outer side of the rotor baffle plate 8, and enabling the supporting tool to penetrate through the end ring 7 in the axial direction; and taking out the supporting tool.
In the embodiment, the supporting tool is used for limiting the flow direction of the conductive and non-conductive material instead of the inner magnetic bridge in the casting process, separating the cast aluminum area 5 from the non-cast aluminum area 6, and cooperating with the shielding part 11 on the rotor baffle plate 8, so that aluminum liquid is prevented from entering the non-cast aluminum area 6 from the end ring in the casting process of the end ring 7. In this embodiment, the D-axis magnetic barrier grooves 3 are filled with the conductive non-magnetic material, and each layer of D-axis magnetic barrier grooves 3 is filled with the conductive non-magnetic material only in the cast aluminum regions 5 at the two ends in the D-axis direction, and the non-cast aluminum region 6 between the cast aluminum regions 5 at the two ends is still air.
The conductive and non-magnetic material is aluminum or red copper.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (11)
1. The motor rotor is characterized by comprising a rotor core (1), wherein a magnetic barrier groove and a central shaft hole (4) are arranged on the rotor core (1), the magnetic barrier groove comprises a Q-axis magnetic barrier groove (2) positioned on the outermost side of a Q axis and a D-axis magnetic barrier groove (3) positioned between the Q-axis magnetic barrier groove (2) and the central shaft hole (4) and extending along the direction of a D axis, the D-axis magnetic barrier groove (3) comprises a non-cast aluminum area (6) and cast aluminum areas (5) positioned at two ends of the non-cast aluminum area (6), the Q-axis magnetic barrier groove (2) and the cast aluminum areas (5) are filled with conductive and non-magnetic conductive materials, rotor baffles (8) are arranged at two ends of the rotor core (1), each rotor baffle (8) is provided with a shielding part (11) capable of shielding the non-cast aluminum area (6), and a communication magnetic barrier groove (9) is arranged on each rotor baffle (8) corresponding to the Q-axis magnetic barrier groove (2) and the cast aluminum areas (5), an end ring (7) is arranged outside the rotor baffle (8), and the end ring (7) at least partially covers the non-cast aluminum area (6).
2. An electric machine rotor, according to claim 1, characterized in that the edges of the communication barrier slots (9) located in correspondence of the D-axis barrier slots (3) close to the Q-axis are aligned with the edges of the non-cast aluminium zones (6) far from the Q-axis.
3. An electric machine rotor according to claim 2, characterized in that a tooling hole (10) is provided between the cast aluminium zone (5) and the non-cast aluminium zone (6) and extends axially through the rotor core (1), the tooling hole (10) extending axially through the rotor baffle (8) and the end ring (7).
4. An electric machine rotor according to claim 3, characterised in that the cast aluminium zone (5) and the non-cast aluminium zone (6) are spaced apart by the tooling holes (10).
5. The motor rotor as recited in claim 3, characterized in that the tooling holes (10) are symmetrical about the axis Q, the distance between the inner edge of the tooling holes (10) close to the axis Q and the axis Q is Lmn, the width of the tooling holes (10) along the axis Q is Wmn, Lmn is more than or equal to Wmn, and n is the number of layers of the D-axis magnetic barrier slots (3) along the axis Q from the axis D.
6. The electric machine rotor as recited in claim 5, characterized in that the outer diameter of the rotor core (1) is Dr, and the distance Lmn between the inner edge of the tooling hole (10) close to the Q axis and the Q axis satisfies
7. The electric machine rotor according to claim 5, wherein the rotor core (1) has an outer diameter Dr, and a width Wmn of the tooling hole (10) in the direction of the Q-axis satisfies
8. An electric machine rotor according to claim 1, characterized in that the rotor core (1) has a height H and the end rings (7) have an axial height HT,
9. an electric machine rotor according to claim 1, characterized in that the diameter of the central shaft hole (4) is Dsft, the outer diameter of the rotor core (1) is Dr, the outer diameter of the end ring (7) is D,
and is
10. An electric machine rotor according to claim 1, characterized in that the end ring (7) has a radial width W3 on one side, the diameter of the central shaft hole (4) of the rotor core is Dsft and the outer diameter of the rotor core is Dr, wherein
11. A self-starting synchronous reluctance machine comprising a machine rotor, characterized in that said machine rotor is a machine rotor according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220213709.XU CN216959464U (en) | 2022-01-26 | 2022-01-26 | Motor rotor and self-starting synchronous reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220213709.XU CN216959464U (en) | 2022-01-26 | 2022-01-26 | Motor rotor and self-starting synchronous reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216959464U true CN216959464U (en) | 2022-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220213709.XU Active CN216959464U (en) | 2022-01-26 | 2022-01-26 | Motor rotor and self-starting synchronous reluctance motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216959464U (en) |
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2022
- 2022-01-26 CN CN202220213709.XU patent/CN216959464U/en active Active
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