CN216290384U - Motor rotor and self-starting synchronous reluctance motor - Google Patents

Abstract

The application provides a motor rotor and a self-starting synchronous reluctance motor. This electric motor rotor includes rotor core (1), be provided with on rotor core (1) and pack groove and slit groove (2), pack the groove including inlayer packing groove (7) and outer packing groove, inlayer packing groove (7) are located between slit groove (2) and rotor core (1) rotor shaft hole (6), inlayer packing groove (7) and outer packing groove fill electrically conductive non-magnetic material, carry out the short-circuit connection through end links (8) that are located rotor core (1) both ends, form the squirrel cage structure. According to the motor rotor, the motor traction synchronization capacity can be effectively improved.

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 is improved during synchronous operation; 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 risk of demagnetization of permanent magnets. However, the self-starting synchronous reluctance motor has the problems that the pulling-in synchronous capability is weak and the synchronous rotating speed is difficult to reach in the on-load starting process, and the application of the motor in wider fields is limited.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the application is to provide a motor rotor and a self-starting synchronous reluctance motor, which can effectively improve the motor pull-in synchronization capability.

In order to solve the problem, the application provides an electric motor rotor, including rotor core, last filling groove and the slit groove of being provided with of rotor core, the filling groove includes inlayer filling groove and outer layer filling groove, and the inlayer filling groove is located between the rotor shaft hole of slit groove and rotor core, and inlayer filling groove and outer layer filling groove fill electrically conductive non-magnetic material, carry out short-circuit connection through the end links that are located rotor core both ends, form squirrel cage structure.

Preferably, the outer layer filling groove comprises an outer layer non-independent filling groove and an outer layer independent filling groove, the outer layer non-independent filling groove and the corresponding slit groove are arranged in the same layer, and the outer layer independent filling groove is located on the outer side of the slit groove along the q-axis direction.

Preferably, the minimum distance from the inner layer filling groove to the shaft hole of the rotor is h3 and 10 sigma & lt h3 & lt 25 sigma, wherein sigma is the width of the air gap between the stator and the rotor.

Preferably, the thickness of the inner-layer filling groove on the q axis along the q axis direction is h1, and the thickness of the inner-layer filling groove on the d axis along the d axis direction is h2, h1 < h 2.

Preferably, the minimum distance from the inner-layer filling groove to the shaft hole of the rotor is h3, h1 is more than or equal to 0.5h3 and less than or equal to h3, and the central angle alpha 1 occupied by the inner-layer filling groove positioned on the q axis under one pole meets the requirement that alpha 1 is more than or equal to 0.2 alpha and less than or equal to 0.4 alpha, wherein alpha is the central angle corresponding to one magnetic pole of the rotor.

Preferably, the minimum distance from the inner-layer filling groove to the shaft hole of the rotor is h3, h3 is equal to or more than h2 is equal to or more than 1.2h3, and the central angle alpha 2 occupied by the inner-layer filling groove on the d axis under one pole meets the requirement that the central angle alpha 2 is equal to or more than 0.2 alpha and equal to or more than 0.4 alpha, wherein the alpha is the central angle corresponding to one magnetic pole of the rotor.

Preferably, the ratio of the area of the inner-layer filling groove on the q axis to the area of the inner-layer filling groove on the d axis is 0.5-0.8.

Preferably, the ratio of the area of the inner-layer filling groove on the q axis to the area of the inner-layer filling groove on the d axis is 0.6-0.7.

Preferably, the ratio of the total area of the inner layer filling grooves to the total area of the filling grooves is 0.2-0.4.

Preferably, the ratio of the total area of the filling grooves of the inner layer to the total area of the filling grooves is 0.25-0.35.

Preferably, the outer layer non-independent filling groove and the slit groove on the same layer form a U-shaped magnetic barrier layer.

Preferably, the outer layer non-independent filling groove, the slit groove and the outer circle of the rotor are separated by a dividing rib, the width k of the dividing rib satisfies 0.5 sigma and k and 2.5 sigma, wherein sigma is the width of an air gap between the stator and the rotor.

Preferably, the outer layer independent filling groove is U-shaped, and the outer layer independent filling groove under each pole is separated from the outer circle of the rotor by the dividing ribs at the position of the q axis.

Preferably, the slit groove is linear, circular or a combination of linear and circular.

Preferably, the rotor core is provided with a groove at the outer circle of the rotor in the q-axis direction, the maximum distance between the contour line of the outer circle of the rotor and the bottom of the groove is d, and d is not less than k and not more than 5k, wherein k is the width of the segmentation rib between the outer layer filling groove and the outer circle of the rotor.

Preferably, under the same pole, the angle of the circle center occupied by the groove is beta, the angle of the circle center corresponding to one magnetic pole of the rotor is alpha, and beta is more than or equal to 0.1 alpha and less than or equal to 0.25 alpha.

Preferably, 0.15 α ≦ β ≦ 0.2 α.

Preferably, the end ring covers all the filling grooves, avoiding all the slit grooves.

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 an electric motor rotor, including rotor core, last filling groove and the slit groove of being provided with of rotor core, the filling groove includes inlayer filling groove and outer packing groove, and the inlayer filling groove is located between the rotor shaft hole of slit groove and rotor core, and inlayer filling groove and outer packing groove fill electrically conductive non-magnetic material, carry out the short-circuit connection through the end links that are located rotor core both ends, form the squirrel cage structure. Through the mode of arranging the inlayer filling groove at the inner periphery side of slot, can effectively increase the filling groove area on the rotor core, improve the cast aluminium area on the rotor core, promote the motor and draw in synchronous ability.

Drawings

FIG. 1 is a schematic structural view of a rotor of an electric machine according to one embodiment of the present application with an end ring removed;

FIG. 2 is a schematic structural view of a rotor of an electric machine according to an embodiment of the present application with an end ring removed;

FIG. 3 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present application;

fig. 4 is a graph comparing the pull-in synchronization capability of the motor according to the embodiment of the present application and the related art motor.

The reference numerals are represented as:

1. a rotor core; 2. a slit groove; 3. the outer layer is not independently filled with grooves; 4. the outer layer independently fills the groove; 5. cutting ribs; 6. a rotor shaft hole; 7. filling the groove in the inner layer; 8. an end ring; 9. and (4) a groove.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present application, a motor rotor includes a rotor core 1, a filling groove and a slit groove 2 are disposed on the rotor core 1, the filling groove includes an inner layer filling groove 7 and an outer layer filling groove, the inner layer filling groove 7 is located between the slit groove 2 and a rotor shaft hole 6 of the rotor core 1, the inner layer filling groove 7 and the outer layer filling groove are filled with an electrically and magnetically non-conductive material, and short-circuit connection is performed through end rings 8 located at two ends of the rotor core 1 to form a squirrel cage structure.

By arranging the inner-layer filling grooves 7 on the inner peripheral side of the slit groove 2, the area of the filling grooves on the rotor core 1 can be effectively increased, the cast aluminum area on the rotor core 1 is increased, and the motor pull-in synchronization capacity is improved. The formation of the rotor squirrel-cage structure provides asynchronous torque for the motor in the starting stage, so that the motor has self-starting capability.

The conductive non-magnetic material is preferably selected to be an aluminum or aluminum alloy material, so that the metal aluminum has good conductivity and low price, and is suitable for the field of industrial motors; the two ends of the filling groove are in short-circuit connection through the end ring 8 to form a rotor squirrel cage structure, the material used by the end ring 8 is the same as the material filled in the filling groove, the end ring 8 short-circuits the filling groove to form a squirrel cage, current in the filling groove can circulate to form a loop, the squirrel cage is also called a starting cage, asynchronous torque is provided at the starting stage of the motor, and the motor has self-starting capability. The conductive and non-magnetic material can also be red copper and other materials.

Referring to fig. 4, a rotation speed curve diagram of a motor using the rotor of the motor of the embodiment of the present application and a motor of the related art during a starting process shows that the motor using the rotor structure of the embodiment of the present application can pull in a synchronous rotation speed under the condition of the same load, while the motor of the prior art is in an out-of-step state, which indicates that the motor using the rotor of the motor of the embodiment of the present application has a stronger pulling-in synchronization capability.

In one embodiment, the outer layer filling grooves comprise outer layer non-independent filling grooves 3 and outer layer independent filling grooves 4, the outer layer non-independent filling grooves 3 are arranged in the same layer with the corresponding slit grooves 2, and the outer layer independent filling grooves 4 are positioned on the outer sides of the slit grooves 2 along the q-axis direction.

In one embodiment, the minimum distance from the inner layer filling slot 7 to the rotor shaft hole 6 is h3, 10 σ ≦ h3 ≦ 25 σ, where σ is the air gap width between the stator and the rotor. In the embodiment, inner layer filling grooves are uniformly arranged at the axial positions of a d axis and a q axis of an inner layer of the rotor core 1, so that the inner space of the rotor core 1 can be fully utilized, the cast aluminum amount on the rotor core 1 is increased, and the pull-in synchronization capacity of the motor is improved; the minimum distance between the filling groove and the rotor shaft hole 6 is limited, and the aim is to ensure the structural safety of the rotor core 1.

In one embodiment, the thickness of the inner layer filling groove 7 on the q axis along the q axis direction is h1, and the thickness of the inner layer filling groove 7 on the d axis along the d axis direction is h2, h1 < h 2. For the motor rotor of the synchronous reluctance motor, the structure and the structural arrangement relation of the slot 2 and the outer layer filling groove are realized, so that the thickness of the iron core at the inner side of the slot 2 is smaller in the q-axis direction where the slot 2 is located, and the thickness of the iron core at the inner side of the slot 2 is larger in the d-axis direction, therefore, in order to enable the space of the rotor iron core 1 at the inner side of the slot 2 to be more fully utilized, the cast aluminum area is more effectively increased, the thickness of the inner layer filling groove 7 on the rotor iron core 1 at the position with a smaller thickness can be smaller, the thickness of the inner layer filling groove 7 on the rotor iron core 1 at the position with a larger thickness can be larger, and therefore, on the basis of not influencing the structural strength of the rotor iron core 1, the structure of the rotor iron core 1 can be utilized to the maximum, and the motor efficiency is effectively improved.

In one embodiment, the minimum distance from the inner-layer filling groove 7 to the rotor shaft hole 6 is h3, h1 is more than or equal to 0.5h3 and less than or equal to h3, and the central angle alpha 1 occupied by the inner-layer filling groove 7 positioned on the q axis under one pole meets the condition that alpha 1 is more than or equal to 0.2 alpha and less than or equal to 0.4 alpha, wherein alpha is the central angle corresponding to one magnetic pole of the rotor.

The minimum distance from the inner-layer filling groove 7 to the rotor shaft hole 6 is h3, h3 is not less than h2 is not less than 1.2h3, and under one pole, the central angle alpha 2 occupied by the inner-layer filling groove 7 positioned on the d axis meets the condition that the alpha 2 is not less than 0.2 alpha and not more than 0.4 alpha, wherein the alpha is the central angle corresponding to one magnetic pole of the rotor.

The inner layer filling groove 7 is arranged at the inner layer position of the rotor between the slit groove 2 and the rotor shaft hole 6, reasonable arrangement is needed, the inner layer filling groove 7 has a certain filling area, and a certain distance is also required to be reserved between the inner layer filling groove 7 and the slit groove 2 and the rotor shaft hole 6, so that the structural safety of the rotor is ensured.

In one embodiment, the ratio of the area of the inner layer filling groove 7 on the q axis to the area of the inner layer filling groove 7 on the d axis is 0.5-0.8.

Preferably, the ratio of the area of the inner layer filling groove 7 on the q axis to the area of the inner layer filling groove 7 on the d axis is 0.6-0.7.

The area of the q-axis area close to the inner side of the rotor is smaller than that of the d-axis area, and in order to fully utilize the space of the inner layer of the rotor, the area proportion of the two inner layer filling grooves 7 is more appropriate according to the value, so that the space of the rotor core 1 in each area can be more fully utilized.

In one embodiment, the ratio of the total area of the inner-layer filling grooves 7 to the total area of the filling grooves is 0.2-0.4.

Preferably, the ratio of the total area of the inner layer filling grooves 7 to the total area of the filling grooves is 0.25-0.35.

The purpose of limiting the proportion of the total area of the inner-layer filling groove 7 to the total area of the filling groove is to ensure that the filling area of the inner-layer filling groove 7 can not influence the structural safety of the rotor, and simultaneously, the traction synchronization capacity of the motor is improved.

In one embodiment, the outer layer non-independent filling groove 3 and the slit groove 2 on the same layer form a U-shaped magnetic barrier layer or a U-like magnetic barrier layer. The arrangement can form a multilayer magnetic barrier structure, and is beneficial to increasing the inductance difference of d and q axes of the motor, thereby fully utilizing the reluctance torque.

In one embodiment, the outer layer non-independent filling groove 3, the slit groove 2 and the outer circle of the rotor are separated by the dividing ribs 5, the width k of each dividing rib 5 satisfies that k is more than or equal to 0.5 sigma and less than or equal to 2.5 sigma, wherein sigma is the width of an air gap between the stator and the rotor, so that the width of each dividing rib 5 can be ensured to be in a proper range, and the motor can be ensured to have a certain salient pole ratio and the structural strength of the rotor.

In one embodiment, the outer independent filling grooves 4 are U-shaped or U-like in shape, and the outer independent filling grooves 4 under each pole are separated by the dividing ribs 5 at the q-axis position and between the outer independent filling grooves 4 and the outer circle of the rotor. The shape of the outer independent filling groove 4 is designed to be similar to that of a magnetic barrier layer formed by the outer dependent filling groove 3 and the slit groove 2, so that the reluctance torque caused by the inductance difference value of the d and q axes can be more fully utilized, and meanwhile, the structural strength of the rotor is also ensured by the segmentation ribs 5.

In one embodiment, the slit groove 2 has a straight shape, a circular arc shape, or a combination of the straight shape and the circular arc shape.

In one embodiment, the rotor core 1 is provided with a groove 9 at the outer circle of the rotor in the q-axis direction, the maximum distance between the contour line of the outer circle of the rotor and the bottom of the groove 9 is d, k is not less than d and not more than 5k, wherein k is the width of the segmentation rib 5 between the outer layer filling groove and the outer circle of the rotor.

Under the same pole, the angle of the circle center occupied by the groove 9 is beta, the angle of the circle center corresponding to one magnetic pole of the rotor is alpha, and beta is more than or equal to 0.1 alpha and less than or equal to 0.25 alpha.

Preferably, 0.15 α ≦ β ≦ 0.2 α.

The grooves 9 are arranged at the positions, and the sizes of the grooves 9 are limited, so that the magnetic resistance in the q-axis direction can be further increased, the salient pole ratio of the motor is increased, and the utilization of the magnetic resistance torque is facilitated.

In one embodiment, the end ring 8 covers all the filling grooves, avoiding all the slit grooves 2. The motor rotor formed by the arrangement not only can form good starting performance by utilizing a squirrel cage structure, but also can use the slit grooves 2 as circulation holes, so that the airflow circulation area of the motor rotor is increased, and the heat radiation performance of the motor rotor is improved.

In one embodiment, the inner layer filling groove 7 has a trapezoidal shape; alternatively, the inner layer filling groove 7 is circular and/or elliptical.

When the inner layer filling groove 7 is circular and/or elliptical, the shape of the inner layer filling groove 7 can be more regular, so that the processing difficulty of the rotor core is reduced, and the processing efficiency is improved.

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 (20)

1. The utility model provides a motor rotor, its characterized in that, includes rotor core (1), be provided with on rotor core (1) and pack groove and slit groove (2), pack the groove and include inlayer packing groove (7) and outer packing groove, inlayer packing groove (7) are located slit groove (2) with between rotor core's (1) rotor shaft hole (6), inlayer packing groove (7) with outer packing groove fills electrically conductive non-magnetic material, carries out short circuit connection through being located end ring (8) at rotor core (1) both ends, forms squirrel-cage structure.

2. The electric machine rotor according to claim 1, characterized in that the outer layer filling grooves comprise outer layer non-independent filling grooves (3) and outer layer independent filling grooves (4), the outer layer non-independent filling grooves (3) are arranged in the same layer as the corresponding slit grooves (2), and the outer layer independent filling grooves (4) are located outside the slit grooves (2) in the q-axis direction.

3. An electric machine rotor according to claim 1, characterised in that the minimum distance of the inner layer filling slot (7) to the rotor shaft bore (6) is h3, 10 σ ≦ h3 ≦ 25 σ, where σ is the width of the air gap between stator and rotor.

4. The electric machine rotor as recited in claim 1, characterized in that the thickness of the inner layer filling groove (7) on the q-axis in the q-axis direction is h1, and the thickness of the inner layer filling groove (7) on the d-axis in the d-axis direction is h2, h1 < h 2.

5. The motor rotor as claimed in claim 4, wherein the minimum distance from the inner layer filling slot (7) to the rotor shaft hole (6) is h3, 0.5h3 ≤ h1 ≤ h3, and the central angle α 1 occupied by the inner layer filling slot (7) located on the q-axis under one pole satisfies 0.2 α ≤ α 1 ≤ 0.4 α, where α is the central angle corresponding to one magnetic pole of the rotor.

6. The motor rotor as claimed in claim 4, wherein the minimum distance from the inner layer filling groove (7) to the rotor shaft hole (6) is h3, h3 ≤ h2 ≤ 1.2h3, and the central angle α 2 occupied by the inner layer filling groove (7) on the d-axis satisfies 0.2 α ≤ α 2 ≤ 0.4 α for one pole, where α is the central angle corresponding to one magnetic pole of the rotor.

7. The rotor according to claim 4, characterised in that the ratio of the area of the inner layer filling grooves (7) on the q-axis to the area of the inner layer filling grooves (7) on the d-axis is 0.5-0.8.

8. The rotor according to claim 7, characterised in that the ratio of the area of the inner layer filling groove (7) on the q-axis to the area of the inner layer filling groove (7) on the d-axis is 0.6-0.7.

9. An electric machine rotor according to claim 1, characterised in that the ratio of the total area of the inner layer filling grooves (7) to the total area of the filling grooves is 0.2-0.4.

10. An electric machine rotor according to claim 9, characterised in that the ratio of the total area of the inner layer filling grooves (7) to the total area of the filling grooves is 0.25-0.35.

11. An electric machine rotor according to claim 2, characterised in that the outer layer non-separate filling groove (3) forms a U-shaped magnetic barrier layer with the slit groove (2) of the same layer.

12. An electric machine rotor according to claim 2, characterised in that the outer layer non-separate filling slots (3) are separated from the slot slots (2) and the rotor outer circumference by dividing ribs (5), the width k of the dividing ribs (5) satisfying 0.5 σ ≦ k ≦ 2.5 σ, where σ is the width of the air gap between the stator and the rotor.

13. An electric machine rotor according to claim 2, characterised in that the outer independent filling slot (4) is U-shaped, the outer independent filling slot (4) under each pole being separated by a dividing rib (5) both at the q-axis position and between the outer independent filling slot (4) and the outer rotor circle.

14. An electric machine rotor according to claim 1, characterised in that the slot (2) is rectilinear, circular or a combination of rectilinear and circular.

15. The motor rotor as recited in claim 1, characterized in that the rotor core (1) is provided with a groove (9) at the outer circle of the rotor in the q-axis direction, the maximum distance between the contour line of the outer circle of the rotor and the bottom of the groove (9) is d, k is greater than or equal to d and less than or equal to 5k, wherein k is the width of the dividing rib (5) between the outer filling groove and the outer circle of the rotor.

16. The rotor according to claim 15, characterized in that under the same pole, the center angle occupied by the grooves (9) is β, the center angle corresponding to one magnetic pole of the rotor is α, and 0.1 α ≦ β ≦ 0.25 α.

17. The electric machine rotor of claim 16, wherein 0.15 α ≦ β ≦ 0.2 α.

18. An electric machine rotor according to claim 1, characterized in that the end ring (8) covers all filling grooves, avoiding all slit grooves (2).

19. An electric machine rotor, according to claim 1, characterised in that the inner layer filling grooves (7) are trapezoidal; or the inner layer filling groove (7) is circular and/or oval.

20. 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 19.

Images