CN216290381U - Motor rotor and self-starting synchronous reluctance motor - Google Patents

Abstract

The application provides a motor rotor and a self-starting synchronous reluctance motor. The motor rotor comprises a rotor core (1), wherein a filling groove and a slit groove (2) are formed in the rotor core (1), the filling groove is formed in the outer peripheral side of the rotor core (1), and the slit groove (2) penetrates through the central area of the rotor core (1). According to the motor rotor of this application, can increase the space that utilizes of rotor, reduce rotor magnetic circuit saturation, increase rotor salient pole poor, further promote motor efficiency.

Description

Motor rotor and self-starting synchronous reluctance motor

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 self-starting synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the synchronous reluctance motor, realizes self-starting through asynchronous torque generated by a rotor conducting bar, and does not need to be driven by a frequency converter. Compared with an asynchronous motor, the motor can realize constant-speed operation, the loss of a rotor is low, and the efficiency in synchronous operation is improved; compared with an asynchronous starting permanent magnet synchronous motor, the motor does not use permanent magnet materials, is low in cost and does not have the problem of demagnetization of permanent magnets. However, because the multilayer magnetic barrier layer structure and the shaft hole of the self-starting synchronous reluctance motor exist at the same time, the utilization space of the rotor is small, and the problem of rotor magnetic circuit saturation is easy to occur.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a motor rotor and self-starting synchronous reluctance motor, can increase the space that utilizes of rotor, reduces rotor magnetic circuit saturation, increases rotor salient pole difference, further promotes motor efficiency.

In order to solve the above problem, the present application provides an electric motor rotor, including rotor core, be provided with filling groove and slit groove on the rotor core, filling groove sets up the periphery side at rotor core, and the slit groove runs through rotor core's central zone.

Preferably, the slot in the central area of the rotor core is at least partially filled with a non-magnetic material, the two ends of the rotor core are provided with rotor short shafts, the rotor short shafts are fixedly connected with the rotor core through the non-magnetic material in the central area of the rotor core, and the central area is an area where the rotor short shafts contact with the end face of the rotor core.

Preferably, the non-magnetically permeable material fills the slot in the central region.

Preferably, each slit groove in the central region is provided with a plate-shaped or columnar non-magnetic conductive material, and the non-magnetic conductive material is distributed in a circular shape when being columnar.

Preferably, the non-magnetic material extends out of the end face of the rotor core, a groove is formed in the rotor short shaft, and the part of the non-magnetic material extending out of the rotor core is inserted into the groove.

Preferably, the non-magnetic material is fixedly connected to the end face of the short rotor shaft at one end, and the non-magnetic material is inserted into the slit groove of the rotor core, penetrates out from the other end of the rotor core, and is fixedly inserted between the rotor short shaft at the other end of the rotor core.

Preferably, the non-magnetic conductive material filled in the slit groove of the central region is symmetrical with respect to the d-axis and the q-axis.

Preferably, the total area of the filling grooves accounts for 30 to 70 percent of the sum of the areas of the filling grooves and the slit grooves.

Preferably, the total area of the filling grooves accounts for 35 to 50 percent of the sum of the areas of the filling grooves and the slit grooves.

Preferably, the filling grooves comprise non-independent filling grooves arranged in the same layer with the slit grooves and independent filling grooves located outside the slit grooves along the q-axis direction, and the independent filling grooves in the same layer are arranged in a whole block or in blocks.

Preferably, the spacing width L1 between adjacent segments satisfies 0.8 σ ≦ L1 ≦ 2 σ when the independently filled slot segments are arranged, σ being the width of the air gap between the stator and the rotor.

Preferably, the included angle alpha 1 between the two ends of the independent filling groove and the connecting line of the rotor center meets the condition that the included angle alpha 1 is more than or equal to 20 degrees and less than or equal to 60 degrees.

Preferably, the width L2 of the non-independent filling groove along the q-axis direction satisfies 0.7L3 ≦ L2 ≦ 1.5L3, wherein L3 is the width of the slit groove along the q-axis direction in the same layer as the non-independent filling groove.

Preferably, the width L2 of the dependent filling groove along the q-axis direction satisfies 0.9L3 ≦ L2 ≦ 1.1L 3.

Preferably, the minimum width of the magnetic conduction channel between two adjacent non-independent filling grooves is d1, the minimum width of the magnetic conduction channel between the corresponding slit grooves of the two non-independent filling grooves is d2, and 0.7d2 is not less than d1 is not less than

1.5d2。

Preferably, 0.9d2 ≦ d1 ≦ 1.1d 2.

Preferably, the slit groove comprises an arc line segment and/or a straight line segment.

Preferably, the non-independent filling groove and the slit groove of the same layer form a magnetic barrier layer, the independent filling groove of the same layer forms a magnetic barrier layer, and the magnetic barrier layer under one pole is symmetrically arranged about the q axis and at least two layers are arranged along the radial direction.

Preferably, the space width L4 between the non-independent filling groove and the slit groove of the same layer satisfies 0.8 sigma < L4 < 2 sigma, sigma being the width of the air gap between the stator and the rotor.

Preferably, the minimum distance between adjacent magnetic barrier layers is L5, the minimum width of the magnetic barrier layer with smaller thickness along the q-axis direction in the q-axis direction is L6, and L5 is more than or equal to 1.5L 6.

Preferably, the minimum distance L7 between the magnetic barrier layer and the outer circle of the rotor satisfies 0 ≦ L7 ≦ 2.5 σ, which is the width of the air gap between the stator and the rotor.

Preferably, the at least partially filled slots are filled with an electrically and magnetically non-conductive material and short-circuited by end rings at both ends of the rotor core to form a squirrel cage.

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 filling groove and the slit groove of being provided with of rotor core, the filling groove sets up the periphery side at rotor core, and the slit groove runs through rotor core's central zone. This electric motor rotor does not set up rotor shaft hole on rotor core for the usable space increase of rotor core can replace former rotor shaft hole position with the slit groove, makes the quantity and the area in slit groove can both increase by a wide margin, can guarantee the degree of consistency and the unsaturation degree that rotor magnetic density distributes on the one hand, and on the other hand can increase rotor salient ratio, promotes motor reluctance torque, promotes motor efficiency.

Drawings

FIG. 1 is a schematic structural diagram 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 of an electric machine according to an embodiment of the present application;

FIG. 3 is an exploded view of a rotor of an electric machine according to one embodiment of the present application;

FIG. 4 is a schematic perspective view of a rotor stub shaft of a rotor of an electric machine according to an embodiment of the present application;

FIG. 5 is an exploded view of a rotor of an electric machine according to one embodiment of the present application;

FIG. 6 is a schematic perspective view of a rotor stub shaft of a rotor of an electric machine according to an embodiment of the present application;

FIG. 7 is a schematic perspective view of a rotor stub shaft of a rotor of an electric machine according to an embodiment of the present application;

fig. 8 is a graph comparing efficiency of a motor using the rotor of the motor according to the embodiment of the present application with that of a motor of the related art.

The reference numerals are represented as:

1. a rotor core; 2. a slit groove; 3. filling the grooves non-independently; 4. independently filling the grooves; 5. a magnetic conduction channel; 6. a non-magnetic conductive material; 7. the minor axis of the rotor.

Detailed Description

Referring to fig. 1 to 8 in combination, according to an embodiment of the present application, a motor rotor includes a rotor core 1, the rotor core 1 is provided with a filling groove and a slit groove 2, the filling groove is disposed on an outer circumferential side of the rotor core 1, and the slit groove 2 penetrates through a central region of the rotor core 1.

This electric motor rotor does not set up rotor shaft hole on rotor core 1 for the usable space increase of rotor core 1 can replace former rotor shaft hole position with slit groove 2, makes the quantity and the area of slit groove 2 can both increase by a wide margin, can guarantee the degree of consistency and the unsaturation degree that the rotor magnetic density distributes on the one hand, and on the other hand can increase rotor salient pole ratio, promotes motor reluctance torque, promotes motor efficiency.

In one embodiment, the slit groove 2 located in the central region of the rotor core 1 is at least partially filled with a non-magnetic material 6, the rotor core 1 is provided with rotor stub shafts 7 at two ends, the rotor stub shafts 7 are fixedly connected with the rotor core 1 through the non-magnetic material 6 in the central region of the rotor core 1, and the central region is a region where the rotor stub shafts 7 contact with the end face of the rotor core 1. In this embodiment, the central zone is regional corresponding to the central shaft hole of electric motor rotor among the prior art, owing to got rid of the rotor shaft hole, consequently the region that sets up the rotor shaft hole originally becomes the entity structure, can set up slot 2 in the central zone that originally sets up the rotor shaft hole to make rotor core 1 can set up the space increase of slot 2, increase rotor core 1's the space of utilizing more effectively, increase rotor salient pole ratio, promote motor reluctance torque, promote motor efficiency.

The non-conductive material 6 is preferably a non-conductive and non-conductive material, such as glass fiber reinforced plastic, carbon fiber, or ceramic layer.

Since the rotor shaft hole is eliminated from the motor rotor, the connection between the rotating shaft and the rotor core 1 needs to be reconsidered. In the embodiment, after the rotor shaft hole is removed, the non-magnetic material 6 is arranged in the slit groove 2 in the central area and is output as a shaft end, and the non-magnetic material 6 which is output as the shaft end and is filled in the slit groove 2 in the central area is symmetrical about the d axis and the q axis, so that the connection and the matching between the non-magnetic material and the rotor short shaft 7 can be realized, the matching structure of the original rotor shaft hole and the rotating shaft is replaced, the eccentricity of the rotor in the operation process is prevented, and the normal output of the motor torque is ensured.

In one embodiment, the non-magnetic material 6 fills the slit grooves 2 in the central region, so that the non-magnetic material 6 has a rectangular plate-shaped structure, and can be stably and reliably connected with the rotor short shafts 7 at the two ends of the rotor core 1.

In one embodiment, the plate-shaped or column-shaped non-magnetic conductive material 6 is respectively arranged in each slit groove 2 in the central area, the non-magnetic conductive material 6 is distributed in a circular shape when the non-magnetic conductive material is in a column shape, and the column-shaped non-magnetic conductive material 6 can be stably and reliably connected with the rotor short shafts 7 at the two ends of the rotor core 1.

In one embodiment, the non-magnetic material 6 extends out of the end face of the rotor core 1, the rotor short shaft 7 is provided with a groove, and the part of the non-magnetic material 6 extending out of the rotor core 1 is inserted into the groove. In this embodiment, the non-magnetic conductive material 6 is filled or inserted into the slit groove 2 in the central region, and the axial length of the non-magnetic conductive material 6 in the central region is greater than the axial length of the rotor core 1, so that the non-magnetic conductive material can extend out of the rotor core 1 from both ends or one end in the axial direction, and is in plug-in fit with the groove of the rotor short shaft 7 outside the rotor core 1, thereby achieving the rotation fit between the rotor core 1 and the rotor short shaft 7.

The groove structure on the rotor stub shaft 7 is adapted to the shape of the non-magnetic material 6 in the slit groove 2 in the central region, for example, when the non-magnetic material 6 in the slit groove 2 in the central region is in a plate-shaped structure, the groove on the rotor stub shaft 7 is also a rectangular groove matched with the plate-shaped structure, and when the non-magnetic material 6 in the slit groove 2 in the central region is in a columnar structure, the groove on the rotor stub shaft 7 is also a columnar groove matched with the columnar structure.

In one embodiment, the non-magnetic material 6 is fixedly connected to the end face of the rotor short shaft 7 at one end, and the non-magnetic material 6 is inserted into the slit groove 2 of the rotor core 1, penetrates out from the other end of the rotor core 1, and is fixedly inserted between the rotor short shaft 7 at the other end of the rotor core 1.

In one embodiment, the total area of the filling grooves accounts for 30% to 70% of the sum of the areas of the filling grooves and the slit grooves 2.

Preferably, the proportion of the total area of the filling grooves to the sum of the areas of the filling grooves and the slit grooves 2 is 35-50%, so that the area of the filling grooves in a certain proportion can be ensured, and the motor has certain load starting capability.

In one embodiment, the filling grooves include a non-independent filling groove 3 disposed in the same layer as the slit groove 2 and an independent filling groove 4 located outside the slit groove 2 in the q-axis direction, and the independent filling grooves 4 of the same layer are disposed in one piece or in blocks.

In one embodiment, the spacing width L1 between adjacent segments satisfies 0.8 σ ≦ L1 ≦ 2 σ when the individual filling slots 4 are arranged in segments, σ being the width of the air gap between the stator and the rotor. The arrangement can ensure the mechanical strength of the rotor part structure and reduce the pressure deformation of the independent filling groove 4.

In one embodiment, the included angle alpha 1 between the two ends of the independent filling groove 4 and the connecting line of the rotor center meets the condition that the included angle alpha 1 is more than or equal to 20 degrees and less than or equal to 60 degrees. By the arrangement, the independent filling grooves 4 can be used as a magnetic barrier layer to increase the reluctance torque of the motor, and can also be used as a starting squirrel cage to improve the starting performance of the motor.

In one embodiment, the width L2 of the non-independent filling groove 3 along the q-axis direction satisfies 0.7L3 ≦ L2 ≦ 1.5L3, where L3 is the width of the slit groove 2 along the q-axis direction in the same layer as the non-independent filling groove 3.

Preferably, the width L2 of the dependent filling grooves 3 in the q-axis direction satisfies 0.9L 3. ltoreq.L 2. ltoreq.1.1L 3. The arrangement can not overload the magnetic conduction channel 5 between the slit grooves 2, thereby reducing the output of the motor and the efficiency of the motor.

In one embodiment, the minimum width of the magnetic conduction channel 5 between two adjacent non-independent filling grooves 3 is d1, and the minimum width of the magnetic conduction channel 5 between the corresponding slit grooves 2 of the two non-independent filling grooves 3 is d2, 0.7d2 ≦ d1 ≦ 1.5d 2.

Preferably, 0.9d2 ≦ d1 ≦ 1.1d 2. The purpose of setting up like this is guaranteed to leave sufficient width between the filling groove, avoids appearing magnetic field saturation, influences the magnetic flux circulation of passageway between the magnetic barrier layer.

In one embodiment, the slit groove 2 comprises an arc segment and/or a straight segment. Both end portions of the slit groove 2 extend substantially in the d-axis direction.

In one embodiment, the non-independent filled grooves 3 and the slit grooves 2 of the same layer form a magnetic barrier layer, the independent filled grooves 4 of the same layer form a magnetic barrier layer, and the magnetic barrier layer under one pole is arranged symmetrically about the q-axis and at least two layers are arranged in the radial direction.

In one embodiment, the space width L4 between the non-independent filling groove 3 and the slit groove 2 of the same layer satisfies 0.8 σ ≦ L4 ≦ 2 σ, σ being the width of the air gap between the stator and the rotor. This arrangement ensures mechanical strength of the rotor portion structure and reduces magnetic flux leakage between the filling groove and the slit groove 2.

In one embodiment, the minimum distance between adjacent magnetic barrier layers is L5, the minimum width of the magnetic barrier layer with smaller thickness along the q-axis direction in the q-axis direction is L6, and L5 is more than or equal to 1.5L 6. The rotor processing difficulty can be reduced by the arrangement, and the uniformity and the unsaturation degree of the magnetic density distribution of the rotor are ensured.

In one embodiment, the minimum distance L7 between the magnetic barrier layer and the outer circle of the rotor satisfies 0 ≦ L7 ≦ 2.5 σ, σ being the width of the air gap between the stator and the rotor. So set up, under the condition of guaranteeing rotor mechanical strength, can reduce the motor magnetic leakage, promote motor efficiency.

In one embodiment, the at least partially filled slots are filled with an electrically non-conductive material and short-circuited by end rings at both ends of the rotor core 1, forming a squirrel cage. The independent filling grooves 4 and the dependent filling grooves 3 are filled with conductive and non-conductive materials, preferably aluminum or aluminum alloy, or copper or other materials. The filling grooves are connected in a self-short circuit mode through end rings at two ends of the rotor to form a squirrel cage structure, and the material of the end rings is the same as that of the filling material in the filling grooves. 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 multi-layer magnetic barrier layer structure provides reluctance torque for the motor so as to realize synchronous operation of the motor.

Referring to fig. 8 in combination, for the comparison of the efficiency of the motor adopting the motor rotor of the embodiment of the present application and the efficiency of the motor of the related art under different torques, it can be seen from the figure that the motor adopting the motor rotor of the embodiment of the present application can increase the rotor salient pole ratio, thereby improving the motor efficiency.

According to an embodiment of the application, a self-starting synchronous reluctance machine comprises a machine rotor, which is the machine rotor described above.

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 (23)

1. The motor rotor is characterized by comprising a rotor core (1), wherein a filling groove and a slit groove (2) are arranged on the rotor core (1), the filling groove is arranged on the outer peripheral side of the rotor core (1), and the slit groove (2) penetrates through the central area of the rotor core (1).

2. An electric machine rotor according to claim 1, characterized in that the slot (2) in the central area of the rotor core (1) is at least partially filled with a non-magnetic material (6), the rotor core (1) is provided with rotor stub shafts (7) at both ends, the rotor stub shafts (7) are fixedly connected with the rotor core (1) through the non-magnetic material (6) in the central area of the rotor core (1), and the central area is the area where the rotor stub shafts (7) contact with the end face of the rotor core (1).

3. An electric machine rotor, according to claim 2, characterised in that said non-magnetically conductive material (6) fills the slot slots (2) of said central zone.

4. An electric machine rotor, according to claim 2, characterized in that in each of said slots (2) in the central area a non-magnetically conductive material (6) is arranged, in the form of a plate or a cylinder, said non-magnetically conductive material (6) being distributed in a circular shape when it is cylindrical.

5. An electric machine rotor according to claim 2, characterized in that the non-magnetic conductive material (6) extends out of the end face of the rotor core (1), a groove is provided on the rotor stub shaft (7), and the part of the non-magnetic conductive material (6) extending out of the rotor core (1) is inserted into the groove.

6. The motor rotor as recited in claim 2, characterized in that the non-magnetic material (6) is fixedly connected to the end face of the rotor stub shaft (7) at one end, and the non-magnetic material (6) is inserted into the slit groove (2) of the rotor core (1), penetrates out from the other end of the rotor core (1), and is fixedly inserted into the rotor stub shaft (7) at the other end of the rotor core (1).

7. An electric machine rotor, according to claim 2, characterised in that the non-magnetically conductive material (6) filled in the slot (2) of the central area is symmetrical about the d-and q-axes.

8. An electric machine rotor according to claim 1, characterised in that the proportion of the total area of the filling grooves to the sum of the areas of the filling grooves and the slot grooves (2) is 30-70%.

9. An electric machine rotor according to claim 8, characterised in that the proportion of the total area of the filling grooves to the sum of the areas of the filling grooves and the slot grooves (2) is 35-50%.

10. An electric machine rotor according to claim 1, characterised in that the filling grooves comprise non-separate filling grooves (3) arranged in the same layer as the slot grooves (2) and separate filling grooves (4) located outside the slot grooves (2) in the direction of the q-axis, the separate filling grooves (4) of the same layer being arranged in one piece or in blocks.

11. An electric machine rotor, according to claim 10, characterised in that the separate filling slots (4) are arranged in segments, the width of the space between adjacent segments, L1, satisfying 0.8 σ ≦ L1 ≦ 2 σ, σ being the width of the air gap between the stator and the rotor.

12. An electric machine rotor according to claim 10, characterised in that the angle α 1 between the two ends of the separate filling slot (4) and the rotor centre line satisfies 20 ° ≦ α 1 ≦ 60 °.

13. The electric motor rotor as recited in claim 10, characterized in that the width L2 of the non-independent filling slot (3) in the q-axis direction satisfies 0.7L3 ≦ L2 ≦ 1.5L3, wherein L3 is the width in the q-axis direction of the slit slot (2) in the same layer as the non-independent filling slot (3).

14. The electric machine rotor as recited in claim 13, characterized in that the width L2 of the non-independent filling slot (3) in the q-axis direction satisfies 0.9L3 ≦ L2 ≦ 1.1L 3.

15. An electric machine rotor according to claim 10, characterized in that the minimum width of the magnetic conduction channel (5) between two adjacent non-independent filling slots (3) is d1, and the minimum width of the magnetic conduction channel (5) between the slit slots (2) corresponding to the two non-independent filling slots (3) is d2, 0.7d2 ≦ d1 ≦ 1.5d 2.

16. The motor rotor as claimed in claim 15, wherein 0.9d2 ≦ d1 ≦ 1.1d 2.

17. An electric machine rotor, according to claim 1, characterised in that the slot (2) comprises an arc segment and/or a straight segment.

18. An electric machine rotor, according to claim 10, characterised in that said non-separate filling grooves (3) and said slit grooves (2) of the same layer form a magnetic barrier layer, said separate filling grooves (4) of the same layer form a magnetic barrier layer, and the magnetic barrier layer under one pole is arranged symmetrically with respect to the q-axis and at least two layers are arranged radially.

19. An electric machine rotor, according to claim 10, characterized in that the width L4 of the space between the non-separate filling slot (3) and the slot (2) of a same layer satisfies 0.8 σ ≦ L4 ≦ 2 σ, σ being the width of the air gap between the stator and the rotor.

20. The rotor of claim 18, wherein the minimum distance between adjacent flux barrier layers is L5, and the minimum width of the flux barrier layer having a smaller thickness in the q-axis direction among the adjacent flux barrier layers in the q-axis direction is L6, L5 ≧ 1.5L 6.

21. The electric machine rotor as recited in claim 18, wherein a minimum distance L7 between the barrier layer and the outer circumference of the rotor satisfies 0 ≦ L7 ≦ 2.5 σ, σ being a width of an air gap between the stator and the rotor.

22. An electric machine rotor, according to claim 1, characterized in that at least part of said filled slots are filled with an electrically and magnetically non-conductive material and short-circuited by end rings at both ends of said rotor core (1), forming a squirrel cage.

23. 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 22.

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