CN112968556B - Rotor assembly and self-starting permanent magnet synchronous reluctance motor - Google Patents
Rotor assembly and self-starting permanent magnet synchronous reluctance motor Download PDFInfo
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- CN112968556B CN112968556B CN202110110934.0A CN202110110934A CN112968556B CN 112968556 B CN112968556 B CN 112968556B CN 202110110934 A CN202110110934 A CN 202110110934A CN 112968556 B CN112968556 B CN 112968556B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The application provides a rotor assembly and a self-starting permanent magnet synchronous reluctance motor. This rotor subassembly includes rotor core (1), on the cross section of rotor core (1), rotor core (1) is provided with mounting groove (2), magnetic barrier groove (4) and a plurality of squirrel cage groove (5), install permanent magnet (3) in mounting groove (2), magnetic barrier groove (4) are including inlayer magnetic barrier groove (41), under the homopolar, there is one deck inlayer magnetic barrier groove (41) at least between adjacent mounting groove (2), be provided with two at least first magnetic bridge (6) on inlayer magnetic barrier groove (41), the width of first magnetic bridge (6) is C1, the minimum width of the magnetic conduction passageway between inlayer magnetic barrier groove (41) and the adjacent mounting groove (2) of radial inboard at first magnetic bridge (6) place is C4, C1 < 0.5C 4. According to the rotor subassembly of this application, can increase motor reluctance torque and permanent magnet torque simultaneously, promote motor performance and efficiency.
Description
Technical Field
The application relates to the technical field of motors, in particular to a rotor assembly and a self-starting permanent magnet synchronous reluctance motor.
Background
The self-starting permanent magnet synchronous reluctance motor combines the structural characteristics of an induction motor and a synchronous permanent magnet reluctance motor, realizes starting by generating torque through cage induction, realizes constant-speed operation by the difference of magnetic fluxes of d and q axes of a rotor and the torque generated by a permanent magnet, and can be directly connected with a power supply to realize starting operation. The self-starting permanent magnet synchronous reluctance motor can utilize reluctance torque to improve the output torque of the motor, and compared with the self-starting permanent magnet motor, the self-starting permanent magnet synchronous reluctance motor has the advantages that the consumption of permanent magnets is reduced, and the cost is reduced; compared with an asynchronous motor, the self-starting permanent magnet synchronous reluctance motor has high efficiency, the rotating speed is constant and synchronous, and the rotating speed cannot change along with the load.
The traditional permanent magnet motor and the self-starting permanent magnet synchronous reluctance motor need a driver for starting and controlling operation, the cost is high, the control is complex, and the driver occupies part of loss, so that the efficiency of the whole motor system is reduced.
Chinese patent publication No. CN107994698A provides a self-starting permanent magnet synchronous reluctance motor to reduce the cost of permanent magnets, but in this patent, magnetic flux travels intensively along the q-axis direction, reducing the magnetic flux in the d-axis direction, so that the permanent magnet torque is reduced and the motor performance is reduced.
Disclosure of Invention
Therefore, the technical problem that this application will be solved lies in providing a rotor subassembly and self-starting permanent magnetism synchronous reluctance motor, can increase motor reluctance torque and permanent magnet torque simultaneously, promotes motor performance and efficiency.
In order to solve the problem, the application provides a rotor assembly, including rotor core, on rotor core's cross section, rotor core is provided with the mounting groove, magnetic barrier groove and a plurality of squirrel cage groove, the mounting groove radially arranges two-layer at least along rotor core, the magnetic barrier groove radially arranges two-layer at least along rotor core, the squirrel cage groove distributes in rotor core's periphery, install the permanent magnet in the mounting groove, the magnetic barrier groove includes inlayer magnetic barrier groove, inlayer magnetic barrier groove is located the radial inboard of outermost mounting groove, same utmost point down, there is one deck inlayer magnetic barrier groove at least between the adjacent mounting groove, be provided with two at least first magnetic bridges on the inlayer magnetic barrier groove, the width of first magnetic bridge is C1, the minimum width of the magnetic conduction passageway between the inlayer magnetic barrier groove at first magnetic bridge place and the adjacent mounting groove of radial inboard is C4, C1 < 0.5 × C4.
Preferably, the inner layer magnetic barrier groove comprises an arc-shaped section protruding outwards in the radial direction and straight line sections located at two ends of the arc-shaped section, and the extending direction of the straight line sections is parallel to the q axis.
Preferably, the width of the inner layer magnetic barrier groove located at the innermost layer in the radial direction in the d-axis direction is L3, and the width of the permanent magnet located at the innermost layer in the radial direction in the d-axis direction is L1, L3 < L1.
Preferably, the magnetic barrier groove further comprises an outer layer magnetic barrier groove, the outer layer magnetic barrier groove is located on the radial outer side of the outermost layer mounting groove, the outer layer magnetic barrier groove is at least two layers, and at least two second magnetic bridges are arranged on each layer of outer layer magnetic barrier groove.
Preferably, the width of the second magnetic bridge of the outer layer magnetic barrier groove is decreased progressively along the radial direction from inside to outside; and/or the distance between the second magnetic bridge of the outer layer magnetic barrier groove and the d axis is decreased progressively along the radial direction from inside to outside.
Preferably, the width of the second magnetic bridge is less than half of the minimum width of the magnetic conduction channel adjacent to the magnetic barrier groove where the second magnetic bridge is located and located at the inner side.
Preferably, the width of each outer layer magnetic barrier groove along the d-axis direction is smaller than the width of the permanent magnet positioned at the innermost layer along the radial direction along the d-axis direction.
Preferably, the squirrel cage grooves include q-axis squirrel cage grooves, and the q-axis squirrel cage grooves are respectively arranged at two ends of the mounting groove and the magnetic barrier groove.
Preferably, the q-axis cage grooves extend in a direction parallel to the q-axis, and are symmetrically distributed with respect to the d-axis or the q-axis.
Preferably, the cage grooves further comprise d-axis cage grooves, and the d-axis cage grooves are located on one side, close to the d axis, of the q-axis cage grooves.
Preferably, the d-axis squirrel cage grooves are multiple and are symmetrically distributed relative to the d-axis or the q-axis.
Preferably, the mounting groove comprises an arc-shaped section protruding outwards in the radial direction and straight line sections arranged at two ends of the arc-shaped section, and the extending direction of the straight line sections is parallel to the q axis.
Preferably, the permanent magnet located at the outermost layer in the radial direction has a thickness of L2, and the permanent magnet located at the innermost layer in the radial direction has a thickness of L1, L1 < L2.
Preferably, the permanent magnet located at the outermost layer in the radial direction has a length K2 in the q-axis direction, and the permanent magnet located at the innermost layer in the radial direction has a length K1 in the q-axis direction, K1 < K2.
Preferably, the permanent magnets and the mounting grooves are symmetrically distributed with respect to the d-axis or the q-axis.
Preferably, the total area of the squirrel cage groove and the outer layer magnetic barrier groove is S1, the total area of the squirrel cage groove, the magnetic barrier groove and the mounting groove is S, and S1 is more than or equal to 30% S.
Preferably, the squirrel cage grooves and the outer layer magnetic barrier grooves are filled with an electric conduction non-magnetic conduction material.
Preferably, end rings are arranged at two ends of the rotor core, and the squirrel-cage grooves and the outer layer magnetic barrier grooves are in short-circuit connection through the end rings to form a squirrel-cage structure.
Preferably, the permanent magnet is provided with spacing arch of spacing to the permanent magnet on at least one side of the mounting groove of permanent magnet both ends tip position.
Preferably, the two ends of the rotor core are provided with non-magnetic baffles which can shield the permanent magnet; or, the mounting groove is filled with an injection molding body.
According to another aspect of the present application, there is provided a self-starting permanent magnet synchronous reluctance machine comprising a stator and a rotor assembly, the rotor assembly being as described above.
Preferably, the width of the division rib between the squirrel cage groove and the mounting groove, between the squirrel cage groove and the rotor outer circle of the rotor core and between the magnetic barrier groove and the squirrel cage groove is L, wherein L is more than or equal to 0.5 sigma and less than or equal to 1.5 sigma, and sigma is the radial width of the air gap between the stator and the rotor core.
The utility model provides a rotor subassembly, including rotor core, on rotor core's cross section, rotor core is provided with the mounting groove, magnetic barrier groove and a plurality of squirrel cage groove, the radial two-layer of arranging at least along rotor core is followed to the mounting groove, magnetic barrier groove radially arranges two-layer at least along rotor core, squirrel cage groove distributes in rotor core's periphery, install the permanent magnet in the mounting groove, magnetic barrier groove includes inlayer magnetic barrier groove, inlayer magnetic barrier groove is located the radial inboard of outermost mounting groove, under the same utmost point, there is one deck inlayer magnetic barrier groove at least between the adjacent mounting groove, be provided with two at least first magnetic bridges on the inlayer magnetic barrier groove, the width of first magnetic bridge is C1, the minimum width of the magnetic conduction passageway between inlayer magnetic barrier groove at first magnetic bridge place and the radial inboard adjacent mounting groove is C4, C1 < 0.5C 4. The rotor subassembly of this embodiment, increase inlayer magnetic barrier groove between adjacent mounting groove, and installation permanent magnet in the mounting groove, magnetic barrier layer in the middle of can utilizing inlayer magnetic barrier groove to form, increase d axle magnetic resistance, increase salient pole difference, through setting up the permanent magnet, can utilize the permanent magnet to provide more q axle flux linkage, increase reluctance torque, set up first magnetic bridge on middle magnetic barrier layer, can make partial permanent magnet flux linkage outwards flow, get into outer permanent magnet through the magnetic bridge, provide d axle permanent magnet flux linkage, reinforcing permanent magnet torque, can also make partial permanent magnet flux freely circulate at adjacent magnetic conduction passageway as q axle flux linkage, realize the rational distribution of magnetic flux, avoid the magnetic flux saturation, increase reluctance torque, consequently, motor reluctance torque and permanent magnet torque can be increased simultaneously, promote motor performance and efficiency.
Drawings
FIG. 1 is a schematic structural view of a rotor assembly according to an embodiment of the present application;
FIG. 2 is an enlarged, fragmentary, schematic structural view of a rotor assembly according to one embodiment of the present application;
fig. 3 is an axial view of a rotor assembly according to an embodiment of the present application.
The reference numerals are represented as:
1. a rotor core; 2. mounting grooves; 21. an arc-shaped section; 22. a straight line segment; 3. a permanent magnet; 4. a magnetic barrier groove; 41. an inner layer magnetic barrier groove; 41. an outer layer magnetic barrier groove; 5. a squirrel cage groove; 51. a q-axis squirrel cage slot; 52. a d-axis squirrel cage groove; 6. a first magnetic bridge; 61. a second magnetic bridge; 7. cutting ribs; 8. a shaft hole; 9. an end ring; 10. and a limiting bulge.
Detailed Description
Referring to fig. 1 to 3 in combination, according to an embodiment of the present application, a rotor assembly includes a rotor core 1, the rotor core 1 is provided with a shaft hole 8, a mounting groove 2, a magnetic barrier groove 4 and a plurality of cage grooves 5 in a cross section of the rotor core 1, the mounting groove 2 is at least arranged in two layers along a radial direction of the rotor core 1, the magnetic barrier groove 4 is at least arranged in two layers along the radial direction of the rotor core 1, the cage grooves 5 are distributed on an outer periphery of the rotor core 1, a permanent magnet 3 is installed in the mounting groove 2, the magnetic barrier groove 4 includes an inner layer magnetic barrier groove 41, the inner layer magnetic barrier groove 41 is located on a radial inner side of the outermost mounting groove 2, under the same pole, at least one inner layer magnetic barrier groove 41 exists between adjacent mounting grooves 2, at least two first magnetic bridges 6 are provided on the inner layer magnetic barrier groove 41, a width of the first magnetic bridge 6 is C1, a minimum width of a magnetic conduction channel between the inner layer magnetic barrier groove 41 where the first magnetic bridge 6 is located and the adjacent mounting groove 2 on the radial inner side is C4, c1 < 0.5 × C4.
In the rotor assembly of the embodiment, the inner layer magnetic barrier groove 41 is additionally arranged between the adjacent mounting grooves 2, the permanent magnet 3 is arranged in the mounting groove 2, the inner layer magnetic barrier groove 41 can be utilized to form a middle magnetic barrier layer, the d-axis magnetic resistance is increased, the salient pole difference is increased, by arranging the permanent magnet 3, more q-axis flux linkage can be provided by using the permanent magnet 3, the reluctance torque is increased, the first magnetic bridge 6 is arranged on the middle magnetic barrier layer, so that the flux linkage of part of the permanent magnet 3 can flow outwards, the magnetic flux enters the outer permanent magnet 3 through the first magnetic bridge 6 to provide a d-axis permanent magnetic flux linkage and enhance the permanent magnetic torque, and part of the magnetic flux of the permanent magnet 3 can be freely circulated in an adjacent magnetic conduction channel as the q-axis magnetic flux linkage, thereby realizing reasonable distribution of the magnetic flux, avoiding saturation of the magnetic flux, increasing the reluctance torque, therefore, the reluctance torque and the permanent magnet torque of the motor can be increased simultaneously, and the performance and the efficiency of the motor are improved.
In this embodiment, the inner-layer magnetic barrier groove 41 is a layer, the number of the first magnetic bridges 6 on the inner-layer magnetic barrier groove 41 is two, and the two first magnetic bridges 6 are symmetric about the d axis, and the inner-layer magnetic barrier groove 41 is divided into three sections by the two first magnetic bridges 6, so that the inner-layer magnetic barrier groove 41 is not a coherent integral structure, and thus a path is provided for a magnetic flux to reach a magnetic conduction channel at the radial outer side through the inner-layer magnetic barrier groove 41, and a d-axis permanent magnetic flux linkage is conveniently provided for a permanent magnet. First magnetic bridge 6 is symmetrical about the d axle, can guarantee that the structure of first magnetic bridge 6 of d axle both sides is the same, can have the magnetic flux of basically the same to circulate through first magnetic bridge 6, and then guarantees the stability and the reliability of motor performance.
The permanent magnet is, for example, a rare earth permanent magnet.
The inner layer magnetic barrier groove 41 comprises an arc-shaped section 21 protruding outwards in the radial direction and straight line sections 22 positioned at two ends of the arc-shaped section 21, and the extending direction of the straight line sections 22 is parallel to the q axis.
The width of the inner layer magnetic barrier groove 41 positioned at the innermost layer along the radial direction in the d-axis direction is L3, the width of the permanent magnet 3 positioned at the innermost layer along the radial direction in the d-axis direction is L1, L3 is less than L1, the width of the inner layer magnetic barrier groove 41 positioned at the innermost layer along the radial direction in the d-axis direction can be limited, and a small magnetic barrier layer is arranged, so that a large magnetic conduction channel is ensured, the space of the magnetic conduction channel is enlarged, and the saturation of the magnetic conduction channel is reduced.
The magnetic barrier groove 4 further comprises an outer magnetic barrier groove 42, the outer magnetic barrier groove 42 is located on the radial outer side of the outermost mounting groove 2, the outer magnetic barrier groove 42 is at least two layers, and at least two second magnetic bridges 61 are arranged on each outer magnetic barrier groove 42. The outer magnetic barrier groove 42 can plan the magnetic flux trend of the permanent magnet 3 positioned on the radial outermost layer, increase the d-axis magnetic resistance, increase the salient pole difference, increase the magnetic resistance torque and improve the motor output torque. In the present embodiment, two second magnetic bridges 61 are respectively disposed on each outer layer of magnetic barrier groove 42, and the two second magnetic bridges 61 are symmetrical about the d axis.
In the radial direction from inside to outside, the width of the second magnetic bridge 61 of the outer layer magnetic barrier groove 42 decreases progressively; and/or, the distance between the second magnetic bridge 61 of the outer layer magnetic barrier groove 42 and the d axis is decreased progressively along the radial direction from inside to outside.
In this embodiment, the outer layer magnetic barrier groove 42 is two layers, two second magnetic bridges 61 are respectively disposed on each layer of outer layer magnetic barrier groove 42, wherein the width of the inner layer second magnetic bridge 61 located on the radial inner side is C2, the width of the outer layer second magnetic bridge 61 located on the radial outer side is C3, C2 > C3, the minimum distance between the second magnetic bridge 61 located on the radial inner side and the D-axis is D1, the minimum distance between the second magnetic bridge 61 located on the radial outer side and the D-axis is D2, and D1 > D2. Part of the permanent magnet magnetic flux flows towards the d axis through the second magnetic bridge 61, the permanent magnet d axis magnetic flux is increased, the second magnetic bridge 61 gradually becomes smaller, the magnetic resistance becomes larger, so that a small part of the magnetic flux flows between the outer layer magnetic barrier grooves 42 along the q axis, and the q axis magnetic flux is increased.
The width of the second magnetic bridge 61 is less than half of the minimum width of the magnetic conduction channel adjacent to the magnetic barrier groove 4 where the second magnetic bridge 61 is located and located at the inner side. Taking the outer layer magnetic barrier groove 42 as two layers, two second magnetic bridges 61 are respectively arranged on each layer of outer layer magnetic barrier groove 42 as an example, the width of the magnetic conduction channel which is positioned on the radial inner side of the inner layer second magnetic bridge 61 and adjacent to the inner layer second magnetic bridge 61 is C5, the width of the magnetic conduction channel which is positioned on the radial inner side of the outer layer second magnetic bridge 61 and adjacent to the outer layer second magnetic bridge 61 is C6, C2 is less than 0.5C 5, and C3 is less than 0.5C 6, so that d-axis magnetic resistance can be effectively increased by using the outer layer magnetic barrier groove 42, salient pole difference is increased, meanwhile, part of permanent magnet flux linkages can flow outwards by using the second magnetic bridge 61, permanent magnet flux linkages are provided, permanent magnet torque is enhanced, part of permanent magnet flux linkages can also be used as q-axis flux linkages, and can freely flow in the upper and lower layer magnetic conduction channels, and reluctance torque is increased.
The width of each outer layer magnetic barrier groove 42 in the d-axis direction is smaller than the width L1 of the permanent magnet 3 located at the innermost layer in the radial direction in the d-axis direction, so that while the reluctance torque is increased, a certain permanent magnet torque can be ensured, and the total torque is increased.
The outer layer magnetic barrier groove 42 can reduce the effect of the stator magnetic field on the permanent magnet and increase the demagnetization resistance of the permanent magnet.
The cage grooves 5 include q-axis cage grooves 51, and the q-axis cage grooves 51 are respectively disposed at both ends of the mounting groove 2 and the magnetic barrier groove 4.
The extending direction of the q-axis squirrel-cage grooves 51 is parallel to the q-axis, and the q-axis squirrel-cage grooves 51 are symmetrically distributed relative to the d-axis or the q-axis.
The extending direction of the q-axis squirrel cage grooves 51 is approximately parallel to the q-axis, so that magnetic flux can flow along the q-axis, and the obstruction of the squirrel cage grooves to the q-axis magnetic flux is reduced.
The cage groove 5 further comprises a d-axis cage groove 52, and the d-axis cage groove 52 is positioned on one side of the q-axis cage groove 51 close to the d axis.
The number of the d-axis cage grooves 52 is plural, and the d-axis cage grooves are symmetrically distributed with respect to the d-axis or the q-axis.
The number of the cage grooves 52 with the d axis can be increased, the cage area is increased, more cage grooves and cage areas are provided, the motor pull-in torque is improved, and the starting synchronization capacity is improved.
The mounting groove 2 comprises an arc-shaped section 21 protruding outwards in the radial direction and straight line sections 22 arranged at two ends of the arc-shaped section 21, and the extending direction of the straight line sections 22 is parallel to the q axis.
The thickness of the permanent magnet 3 located at the outermost layer in the radial direction is L2, and the thickness of the permanent magnet 3 located at the innermost layer in the radial direction is L1, L1 < L2.
The length of the permanent magnet 3 located at the outermost layer in the radial direction in the q-axis direction is K2, and the length of the permanent magnet 3 located at the innermost layer in the radial direction in the q-axis direction is K1, K1 < K2.
The permanent magnets 3 and the mounting grooves 2 are symmetrically distributed with respect to the d-axis or the q-axis.
Through the comparison, the thickness relation and the length relation of the permanent magnet 3 can be limited, so that a proper permanent magnet structure is arranged, and the utilization rate of the permanent magnet 3 is ensured.
The squirrel cage grooves 5 and the outer layer magnetic barrier grooves 42 are filled with conductive and non-conductive materials. The electrically and magnetically non-conductive material is, for example, aluminum or an aluminum alloy.
End rings 9 are arranged at two ends of the rotor core 1, and the squirrel-cage grooves 5 and the outer layer magnetic barrier grooves 42 are in short-circuit connection through the end rings 9 to form a squirrel-cage structure. The material of the end ring 9 is the same as the filling material in the squirrel cage grooves 5 and the outer layer magnetic barrier grooves 42. The squirrel cage structure with self-short circuit provides asynchronous torque at the starting stage of the motor so as to realize the self-starting of the motor.
The total area of the squirrel cage groove 5 and the outer layer magnetic barrier groove 42 is S1, the total area of the squirrel cage groove 5, the magnetic barrier groove 4 and the mounting groove 2 is S, and S1 is more than or equal to 30% of S. Preferably, 0.3S is less than or equal to S1 is less than or equal to 0.7S, so that a certain cast aluminum area can be ensured, and the starting synchronization capability of the motor is improved.
Be provided with on at least one side of the mounting groove 2 of 3 both ends tip positions of permanent magnet and carry out spacing arch 10 to permanent magnet 3, spacing arch 10 is towards offside side protrusion, can follow the both ends of permanent magnet 3 and carry on spacingly to permanent magnet 3, prevents that permanent magnet 3 from sliding, improves the stability and the reliability of 3 mounted positions of permanent magnet.
In one embodiment, the two ends of the rotor core 1 are provided with non-magnetic baffles, which can shield the permanent magnets 3. The non-magnetic baffle can be fixed to permanent magnet 3 along the both ends of rotor core 1's axial direction, and the part that is not sheltered from of mounting groove 2 can form the through-hole in rotor core 1's axial direction, helps air or refrigerant to flow, improves the rotor heat dissipation, promotes motor efficiency.
Still be equipped with the rivet hole on the rotor core 1, the rotor subassembly compresses tightly the magnetic baffle that does not lead at 1 both ends of rotor core along the axial through the rivet to constitute the rotor subassembly. The non-magnetic baffle can play an axial fixing role for the permanent magnet 3, and the permanent magnet 3 is prevented from falling out.
In one embodiment, the mounting groove 2 is filled with an injection molding body, so that the permanent magnet 3 and the rotor core 1 can be integrally injection molded by using the injection molding body, and the permanent magnet 3 can be well fixed.
According to an embodiment of the present application, a self-starting permanent magnet synchronous reluctance machine includes a stator and a rotor assembly, which is the above-described rotor assembly.
The width of the segmentation ribs 7 between the squirrel cage groove 5 and the mounting groove 2, between the squirrel cage groove 5 and the rotor excircle of the rotor core 1, and between the magnetic barrier groove 4 and the squirrel cage groove 5 is L, wherein L is more than or equal to 0.5 sigma and less than or equal to 1.5 sigma, and sigma is the radial width of the air gap between the stator and the rotor core 1. By limiting the relation between the width of the segmentation rib 7 and the width of the air gap, the width of the magnetic bridge can be prevented from being too small, so that the mechanical strength of the rotor assembly is improved, and the width of the magnetic bridge can be prevented from being too large, so that the magnetic leakage is reduced.
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 (21)
1. The rotor assembly is characterized by comprising a rotor core (1), wherein the cross section of the rotor core (1) is provided with a mounting groove (2), magnetic barrier grooves (4) and a plurality of squirrel cage grooves (5), the mounting groove (2) is at least two layers along the radial direction of the rotor core (1), the magnetic barrier grooves (4) are at least two layers along the radial direction of the rotor core (1), the squirrel cage grooves (5) are distributed on the periphery of the rotor core (1), permanent magnets (3) are installed in the mounting groove (2), the magnetic barrier grooves (4) comprise inner layer magnetic barrier grooves (41), the inner layer magnetic barrier grooves (41) are located on the radial inner side of the mounting groove (2) on the outermost layer, under the same pole, at least one layer exists between the adjacent mounting grooves (2) and the inner layer magnetic barrier grooves (41), at least two first magnetic bridges (6) are arranged on the inner layer magnetic barrier groove (41), the width of each first magnetic bridge (6) is C1, the minimum width of a magnetic conduction channel between the inner layer magnetic barrier groove (41) where the first magnetic bridges (6) are located and the adjacent mounting groove (2) on the radial inner side is C4, and C1 is less than 0.5C 4; the magnetic barrier groove (4) further comprises an outer layer magnetic barrier groove (42), the outer layer magnetic barrier groove (42) is located on the outermost layer of the radial outer side of the mounting groove (2), the outer layer magnetic barrier groove (42) is at least two layers, and each layer of the outer layer magnetic barrier groove (42) is provided with at least two second magnetic bridges (61).
2. The rotor assembly according to claim 1, wherein the inner layer magnetic barrier groove (41) comprises an arc-shaped section (21) protruding outwards in the radial direction and straight sections (22) located at two ends of the arc-shaped section (21), and the extending direction of the straight sections (22) is parallel to a q axis.
3. The rotor assembly according to claim 2, wherein the inner layer magnetic barrier groove (41) located radially innermost has a width L3 in the d-axis direction, and the permanent magnet (3) located radially innermost has a width L1 in the d-axis direction, L3 < L1.
4. The rotor assembly according to claim 1, wherein the width of the second magnetic bridge (61) of the outer layer magnetic barrier groove (42) decreases in a radial inside-out direction; and/or the distance between the second magnetic bridge (61) of the outer layer magnetic barrier groove (42) and the d axis is decreased progressively along the radial direction from inside to outside.
5. The rotor assembly according to claim 1, wherein the width of the second magnetic bridge (61) is less than half of the minimum width of the magnetic conducting channel adjacent to and inside the magnetic barrier groove (4) where the second magnetic bridge (61) is located.
6. The rotor assembly according to claim 1, wherein each of the outer layer magnetic barrier grooves (42) has a width in the d-axis direction smaller than that of the permanent magnet (3) located at the innermost layer in the radial direction.
7. The rotor assembly according to claim 1, wherein the cage grooves (5) comprise q-axis cage grooves (51), the q-axis cage grooves (51) being disposed at both ends of the mounting groove (2) and the magnetic barrier groove (4), respectively.
8. The rotor assembly according to claim 7, wherein the q-axis cage grooves (51) extend in a direction parallel to the q-axis, the q-axis cage grooves (51) being symmetrically distributed with respect to the d-axis or the q-axis.
9. The rotor assembly of claim 7, wherein the cage groove (5) further comprises a d-axis cage groove (52), the d-axis cage groove (52) being located on a side of the q-axis cage groove (51) near the d-axis.
10. The rotor assembly of claim 9, wherein the d-axis cage grooves (52) are plural and symmetrically distributed with respect to the d-axis or the q-axis.
11. The rotor assembly according to claim 1, wherein the mounting groove (2) comprises an arc-shaped section (21) protruding radially outwards and straight sections (22) arranged at both ends of the arc-shaped section (21), and the extending direction of the straight sections (22) is parallel to the q-axis.
12. The rotor assembly according to claim 1, wherein the permanent magnet (3) located radially outermost has a thickness of L2, the permanent magnet (3) located radially innermost has a thickness of L1, L1 < L2.
13. The rotor assembly according to claim 1, wherein the permanent magnet (3) located at the outermost layer in the radial direction has a length of K2 in the q-axis direction, and the permanent magnet (3) located at the innermost layer in the radial direction has a length of K1 in the q-axis direction, K1 < K2.
14. The rotor assembly according to claim 1, characterized in that the permanent magnets (3) and the mounting slots (2) are symmetrically distributed with respect to the d-axis or the q-axis.
15. The rotor assembly according to claim 1, wherein the total area of the cage groove (5) and the outer layer magnetic barrier groove (42) is S1, the total area of the cage groove (5), the magnetic barrier groove (4) and the mounting groove (2) is S, and S1 is greater than or equal to 30% S.
16. The rotor assembly according to claim 1, wherein the squirrel cage grooves (5) and the outer layer magnetic barrier grooves (42) are filled with an electrically and magnetically non-conductive material.
17. The rotor assembly according to claim 16, wherein end rings (9) are provided at both ends of the rotor core (1), and the cage grooves (5) and the outer layer barrier grooves (42) are short-circuited by the end rings (9) to form a cage structure.
18. The rotor assembly according to claim 1, characterized in that at least one side edge of the mounting groove (2) at the end positions of the two ends of the permanent magnet (3) is provided with a limiting protrusion (10) for limiting the permanent magnet (3).
19. The rotor assembly according to claim 1, wherein both ends of the rotor core (1) are provided with non-magnetic baffles capable of shielding the permanent magnets (3); or the mounting groove (2) is filled with an injection molding body.
20. A self-starting permanent magnet synchronous reluctance machine comprising a stator and a rotor assembly, wherein the rotor assembly is as claimed in any one of claims 1 to 19.
21. Self-starting permanent magnet synchronous reluctance machine according to claim 20, wherein the width of the dividing ribs (7) between the cage grooves (5) and the mounting grooves (2), between the cage grooves (5) and the outer rotor circle of the rotor core (1) and between the barrier grooves (4) and the cage grooves (5) is L, wherein 0.5 σ ≦ L ≦ 1.5 σ, σ being the radial width of the air gap between the stator and the rotor core (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10205358B2 (en) * | 2014-04-12 | 2019-02-12 | GM Global Technology Operations LLC | Electric machine for a vehicle powertrain and the electric machine includes a permanent magnet |
| CN105634166A (en) * | 2014-11-26 | 2016-06-01 | 天津市松正电动汽车技术股份有限公司 | Synchronous s reluctance motor rotor |
| CN205377493U (en) * | 2016-01-05 | 2016-07-06 | 上海特波电机有限公司 | Asymmetric permanent -magnet machine for new energy automobile |
| CN105958692B (en) * | 2016-07-15 | 2018-02-13 | 东南大学 | A kind of high torque density permanent-magnet magnetic resistance synchronous motor rotor structure |
| US10749390B2 (en) * | 2017-01-06 | 2020-08-18 | Hamilton Sunstrand Corporation | Line-start synchronous reluctance motor with improved performance |
| CN108110920A (en) * | 2017-12-14 | 2018-06-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Asynchronous starting synchronous magnetic resistance motor rotor, motor and compressor |
| CN108023454A (en) * | 2018-01-26 | 2018-05-11 | 湖北工业大学 | A kind of New-type asynchronous starts ferrite permanent-magnet assist type reluctance-synchronous machine |
| CN109638998B (en) * | 2018-12-04 | 2024-05-07 | 珠海格力电器股份有限公司 | Motor rotor, motor and electric automobile |
| CN210839094U (en) * | 2019-06-19 | 2020-06-23 | 珠海格力电器股份有限公司 | Rotor structure of direct-start synchronous reluctance motor and motor |
| CN110149014B (en) * | 2019-06-19 | 2020-11-10 | 珠海格力电器股份有限公司 | Self-starting synchronous reluctance motor rotor structure and motor with same |
| CN211830364U (en) * | 2019-12-17 | 2020-10-30 | 沈阳化工大学 | Synchronous motor with permanent magnet reluctance hybrid rotor structure |
| CN111614181A (en) * | 2020-06-24 | 2020-09-01 | 珠海格力电器股份有限公司 | Rotor structure of self-starting hybrid excitation permanent magnet auxiliary reluctance motor and motor |
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