CN216819528U - 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), filled groove and slit groove (2) have been seted up on rotor core (1), the filled groove includes non-independent filled groove (3) and q axle filled groove (4), cut apart through cutting apart muscle (5) between non-independent filled groove (3) and the slit groove on the same floor, it is L along the width of d axle direction to cut apart muscle (5) on the same floor, be M with the tip width that cuts apart muscle (5) and be close to cut apart muscle (5) with the filled groove that cuts apart muscle (5) same floor arranged, satisfy between L and the M that 0.2M is less than or equal to L is less than or equal to 0.35M, should satisfy K with the tip width K that cuts apart muscle (5) near the slit groove (2) that cuts apart muscle (5) on the same floor arranged simultaneously and be less than or equal to M. According to the motor rotor, the mechanical strength of the rotor can be enhanced, the deformation of the rotor in the manufacturing process is reduced, and the difficulty of process manufacturing is reduced.

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 the permanent magnet.

However, the rotor structure of the self-starting synchronous reluctance motor is formed by a plurality of magnetic barrier layers, so that the rotor is easy to deform in the manufacturing process of the motor, and the difficulty of process manufacturing is increased.

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 enhance the mechanical strength of the rotor, reduce the deformation of the rotor in the manufacturing process and reduce the difficulty of process manufacturing.

In order to solve the problem, the application provides a motor rotor, including rotor core, filling groove and slit groove have been seted up on the rotor core, the filling groove includes non-independent filling groove and q axle filling groove, non-independent filling groove sets up the both sides at the slit groove, q axle filling groove sets up the one side that is close to the q axle at the rotor excircle, cut apart through cutting apart the muscle between non-independent filling groove and the slit groove on the same floor, the width of cutting apart the muscle on the same floor along d axle direction is L, the filling groove that arranges with cutting apart the muscle on the same floor is close to the tip width of cutting apart the muscle and is M, satisfy between L and the M that 0.2M is less than or equal to L0.35M, should satisfy K with the tip width K that cuts apart the muscle on the same floor of slit groove that cuts apart the muscle simultaneously and be close to the tip width of cutting apart the muscle and be less than or equal to M.

Preferably, the slit groove includes an arc line segment and/or a straight line segment, when the slit groove includes an arc line segment, the radian of the arc line segment is gradually increased along the direction from the rotor shaft hole to the outer circle of the rotor, and the radian of the outer circle of the slit groove on the same layer is larger than that of the inner circle.

Preferably, the slit groove includes an arc line segment and/or a straight line segment, and the width of the slit groove in the q-axis direction increases in directions from both sides of the q-axis.

Preferably, the sum of the widths of the q-axis filling grooves and the slit grooves in the q-axis direction is m1+ ∑ m2, and the width from the rotor shaft hole to the rotor outer circle is m3, (m1+ ∑ m2)/m3 is 0.3-0.5.

Preferably, (m1+ ∑ m2)/m3 is 0.35-0.45.

Preferably, the minimum width of the magnetic conduction channel between two adjacent non-independent filling grooves is W, the minimum width of the magnetic conduction channel between the slit grooves on the same layer with the two non-independent filling grooves is d, and W is larger than or equal to d.

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, on a cross section perpendicular to the central axis of the rotor core, an included angle α 1 formed by a connecting line of both ends of the q-axis filling slot and the central axis of the rotor core satisfies 20 ° ≦ α 1 ≦ 60 °.

Preferably, the non-independent filling groove and the slit groove on the same layer form a magnetic barrier layer, the q-axis filling groove forms the magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor meets the condition that h1 is larger than or equal to sigma, and the sigma is the width of an air gap between the stator and the rotor.

Preferably, the non-independent filling grooves and the slit grooves on the same layer form magnetic barrier layers, the q-axis filling grooves form the magnetic barrier layers, the minimum width of the magnetic conduction channel between two adjacent magnetic barrier layers along the q-axis direction is h3, the minimum width of the magnetic barrier layer with smaller width along the d-axis direction in the two adjacent magnetic barrier layers is h2, and h3 is more than or equal to 1.5h 2.

Preferably, the q-axis filling groove under the same pole is of a segmented structure, and a segmentation rib is arranged between groove segments of two adjacent q-axis filling grooves.

Preferably, the width of the dividing rib between two adjacent groove sections along the d-axis direction is x1, x1 > 0.1s1, x1 > 0.1s2, and x1 > 0.1(s1+ s2), wherein s1 is the maximum width of one of the two adjacent groove sections along the d-axis direction, and s2 is the maximum width of the other of the two adjacent groove sections along the d-axis direction.

Preferably, the sum of the widths of the dividing ribs between the groove sections of the q-axis filling groove under the same pole along the d-axis direction is sigma x1, sigma x1 > 0.1 sigma (s1+ s2), wherein sigma (s1+ s2) is the sum of the widths of the q-axis filling grooves along the d-axis direction.

Preferably, the width of the dividing rib between two adjacent groove sections along the direction of the d axis is x1, x1 is more than or equal to sigma, and sigma is the width of an air gap between the stator and the rotor.

Preferably, the difference in area of the groove segments under the same pole is within ± 15%.

Preferably, the maximum width of the rotor shaft hole in the q-axis direction is smaller than or equal to the maximum width of the rotor shaft hole in the d-axis direction.

Preferably, the rotor shaft bore is composed of arc segments and/or straight segments.

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 packing groove and the slit groove of having seted up of rotor core, the packing groove is including non-independent packing groove and q axle packing groove, non-independent packing groove sets up the both sides at the slit groove, q axle packing groove sets up the one side that is close to the q axle at the rotor excircle, non-independent packing groove is cut apart through cutting apart the muscle with between the slit groove on the same floor, it is L to cut apart the width of muscle along d axle direction with the floor, be M with the tip width that the packing groove of cutting apart the muscle with arranging on the same floor of cutting apart the muscle, satisfy between L and the M that 0.2M is less than or equal to L and is less than or equal to L

0.35M, and the width K of the end part, close to the segmentation rib, of the slit groove arranged on the same layer as the segmentation rib meets the condition that K is less than or equal to M. The size relation between the segmentation ribs and the end parts of the filling grooves and the slit grooves is limited, so that the pressure bearing capacity of the segmentation ribs can be enhanced, the mechanical strength of the rotor can be enhanced, the deformation of the rotor in the manufacturing process is reduced, the difficulty of process manufacturing is reduced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

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.

The reference numerals are represented as:

1. a rotor core; 2. a slit groove; 3. filling the grooves non-independently; 4. q-axis filling grooves; 5. cutting ribs; 6. a rotor shaft hole; 7. a magnetic conduction channel; 8. a trough section.

Detailed Description

With reference to fig. 1 to 2, 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 formed in the rotor core 1, the filling groove includes a non-independent filling groove 3 and a q-axis filling groove 4, the non-independent filling groove 3 is disposed on two sides of the slit groove 2, the q-axis filling groove 4 is disposed on one side of an outer circle of the rotor near the q-axis, the non-independent filling groove 3 and the slit groove 2 on the same layer are divided by a dividing rib 5, a width of the dividing rib 5 on the same layer along the d-axis direction is L, a width of an end portion of the filling groove disposed on the same layer as the dividing rib 5 near the dividing rib 5 is M, a width of the end portion of the slit groove 2 disposed on the same layer as the dividing rib 5 between L and M satisfies 0.2M or more and 0.35M, and a width of an end portion of the slit groove 2 disposed on the same layer as the dividing rib 5 satisfies K or more and K or less than M.

The existence of the segmentation ribs 5 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor in the manufacturing process and reduce the difficulty of the manufacturing process. The size of the end part between the segmentation rib 5 and the filling groove and between the segmentation rib 5 and the slit groove 2 is limited, the pressure bearing capacity of the segmentation rib 5 can be enhanced, the pressure bearing area of the magnetic barrier layer is enhanced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In one embodiment, the slit groove 2 includes an arc segment and/or a straight segment, when the slit groove 2 includes an arc segment, the arc of the arc segment becomes gradually larger in a direction from the rotor shaft hole 6 to the outer circumference of the rotor, and the outer circumference arc of the slit groove 2 of the same layer is larger than the inner circumference arc.

In one embodiment, the slit groove 2 includes an arc line segment and/or a straight line segment, and the width of the slit groove 2 in the q-axis direction increases in directions from both sides of the q-axis.

Through the above setting mode, can increase the utilization ratio in rotor space, rationally arrange the slit groove to increase rotor salient pole ratio, promote motor reluctance torque.

In one embodiment, the sum of the widths of the q-axis filling groove 4 and the slit groove 2 in the q-axis direction is m1+ ∑ m2, the width from the rotor shaft hole 6 to the outer circle of the rotor is m3, (m1+ ∑ m2)/m3 is 0.3-0.5, so that a reasonable magnetic barrier occupation ratio can be selected, a sufficient magnetic barrier width is ensured, a reasonable magnetic flux channel is ensured, and the supersaturation of a magnetic circuit is prevented while the salient pole ratio of the motor is increased.

Preferably, (m1+ ∑ m2)/m3 is 0.35-0.45.

In one embodiment, the minimum width of the magnetic conduction channel 7 between two adjacent non-independent filling grooves 3 is W, the minimum width of the magnetic conduction channel 7 between the slit grooves 2 on the same layer with the two non-independent filling grooves 3 is d, and W is larger than or equal to d, so as to ensure that enough width is left between the filling grooves, and avoid magnetic field saturation to influence the magnetic flux circulation of the channel between magnetic barrier layers.

In one embodiment, the filling grooves further comprise q-axis filling grooves 4, the q-axis filling grooves 4 are arranged on one side, close to the q axis, of the outer circumference of the rotor core 1, and on a cross section perpendicular to the central axis of the rotor core 1, an included angle alpha 1 formed by connecting lines of two ends of the q-axis filling grooves 4 and the central axis of the rotor core 1 meets the condition that alpha 1 is more than or equal to 20 degrees and less than or equal to alpha 1 and less than or equal to 60 degrees.

Preferably, 30 DEG-alpha 1-50 deg. By the arrangement, the magnetic barrier layer is formed and serves as a filling groove, so that the magnetic barrier layer can be used as the magnetic barrier layer to increase the reluctance torque of the motor, and can also be used as a starting squirrel cage for improving the starting performance of the motor.

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 total area of the filling grooves accounts for 35 to 50% of the sum of the areas of the filling grooves and the slit grooves 2.

By limiting 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, the area of the filling grooves with a certain proportion can be ensured, and the motor has certain load starting capability.

In one embodiment, the non-independent filling groove 3 and the slit groove 2 on the same layer form a magnetic barrier layer, the q-axis filling groove 4 forms the magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor meets the condition that h1 is more than or equal to sigma, and sigma is the width of an air gap between the stator and the rotor, so that the structural strength of the rotor can be ensured.

In one embodiment, the non-independent filling grooves 3 and the slit grooves 2 on the same layer form magnetic barrier layers, the q-axis filling grooves 4 form magnetic barrier layers, the minimum width of the magnetic conduction channel 7 between two adjacent magnetic barrier layers along the q-axis direction is h3, the minimum width of the magnetic barrier layer with the smaller width along the d-axis direction in the two adjacent magnetic barrier layers is h2, and h3 is more than or equal to 1.5h 2. The widths of the magnetic barrier layers and the widths of the magnetic barrier layers can be reasonably arranged, so that the magnetic resistance difference generated by the magnetic barrier layers can be fully utilized, the magnetic resistance torque is improved, and the saturation of a magnetic flux path can be avoided.

In one embodiment, the dividing ribs 5 are formed between the non-independent filling grooves 3 and the slit grooves 2, the plane where the side surfaces of the dividing ribs 5 are located is parallel to or intersected with the plane where the q axis is located, the dividing ribs 5 can be arranged in a staggered mode according to the trend of the magnetic flux leakage line of the rotor, and the magnetic flux leakage of the rotor is reduced.

In one embodiment, the q-axis filling grooves 4 under the same pole are of a segmented structure, and a dividing rib 5 is arranged between the groove sections 8 of two adjacent q-axis filling grooves 4.

The width of the dividing rib 5 between two adjacent groove sections 8 along the d-axis direction is x1, x1 > 0.1s1, x1 > 0.1s2, and x1 > 0.1(s1+ s2), wherein s1 is the maximum width of one of the two adjacent groove sections 8 along the d-axis direction, and s2 is the maximum width of the other one of the two adjacent groove sections 8 along the d-axis direction.

The sum of the widths of the dividing ribs 5 between the groove sections 8 of the q-axis filling grooves 4 under the same pole along the d-axis direction is sigma x1, sigma x1 is more than 0.1 sigma (s1+ s2), wherein sigma (s1+ s2) is the sum of the widths of the q-axis filling grooves along the d-axis direction.

A q-axis filling groove 4 is formed in the q-axis direction of the periphery of the rotor, and the q-axis filling groove 4 can serve as a squirrel cage groove to improve the loaded starting capacity of the motor and form a magnetic barrier layer to increase the salient pole ratio and improve the reluctance torque; the independent filling grooves are designed in a segmented mode, and the size of the segmentation ribs among the segments is limited, so that the mechanical structure strength of the rotor is improved, and the difficulty of a manufacturing process is reduced.

In one embodiment, the number of slot segments 8 making up the q-axis filled slot 4 is four, four slot segments 8 being symmetrical about the q-axis, and the dividing rib 5 between the two middle slot segments 8 lying on and bisected by the q-axis.

In one embodiment, there are three channel segments 8 that make up the q-axis filled channel 4, with three channel segments 8 being symmetric about the q-axis that passes through the centrally located channel segment 8 and bisects that channel segment 8. In the present embodiment, the number of q-axis filling grooves 4 is small, the number of the dividing ribs 5 between adjacent q-axis filling grooves 4 is also reduced, and the rotor shaft hole 6 may have an elliptical structure. The number of the segmentation ribs 5 is reduced, so that the magnetic resistance in the q-axis direction can be increased, the difference value of the magnetic resistance of the d-axis and the q-axis is increased, and the magnetic resistance torque of the motor is improved; the elliptical rotor shaft hole 6 can make reasonable use of the space within the innermost slit groove 2.

In one embodiment, the width of the dividing rib 5 between two adjacent groove sections 8 along the d-axis direction is x1, x1 ≧ sigma, and sigma is the width of the air gap between the stator and the rotor.

The area difference of each groove section 8 under the same pole is within +/-15%.

The above-described limitation of the width of the divided rib 5 and the limitation of the area difference of each groove segment 8 can make the pressure applied to the divided rib near each q-axis filling groove 4 uniform, so that the pressure applied to a part of the divided rib 5 is not excessively large.

In one embodiment, the maximum width of the rotor shaft hole 6 in the q-axis direction is less than or equal to the maximum width of the rotor shaft hole 6 in the d-axis direction, and the arrangement mode can increase the utilization rate of the rotor space, so that the slit grooves can be reasonably arranged to increase the rotor salient pole ratio and improve the reluctance torque of the motor.

In one embodiment, the rotor shaft bore 6 is comprised of arc and/or straight segments. The rotor shaft bore 6 is located in the center of the rotor, which has an effect on the arrangement of the magnetic barrier layers. The rotor shaft hole 6 is not limited to be only circular, that is, the rotor shaft hole 6 can be elliptical or elliptical-like, so that the space of the magnetic barrier layer arranged on the rotor can be increased, and the output torque of the motor can be further improved.

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. In the embodiment, the filling grooves comprise q-axis filling grooves 4 and non-independent filling grooves 3, at least part of the filling grooves are filled with conductive and non-conductive 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 materials of the end rings are the same as those of 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.

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. A motor rotor is characterized by comprising a rotor core (1), wherein the rotor core (1) is provided with a filling groove and a slit groove (2), the filling grooves comprise non-independent filling grooves (3) and q-axis filling grooves (4), the non-independent filling grooves (3) are arranged on two sides of the slit groove (2), the q-axis filling groove (4) is arranged on one side of the outer circle of the rotor close to the q-axis, the non-independent filling groove (3) and the slit groove (2) on the same layer are divided by a dividing rib (5), the width of the dividing rib (5) on the same layer along the d-axis direction is L, the width of the end part of the filling groove which is arranged in the same layer with the segmentation rib (5) and is close to the segmentation rib (5) is M, L is more than or equal to 0.2M and less than or equal to 0.35M between L and M, meanwhile, the width K of the end part, close to the segmentation rib (5), of the slit groove (2) which is arranged in the same layer with the segmentation rib (5) meets the condition that K is less than or equal to M.

2. An electric machine rotor according to claim 1, characterised in that the slot (2) comprises an arc segment and/or a straight segment, when the slot (2) comprises an arc segment, the arc of the arc segment becomes progressively larger in the direction from the rotor shaft bore (6) to the rotor outer circumference, and the outer circumference arc of the slot (2) of the same layer is larger than the inner circumference arc.

3. An electric machine rotor, according to claim 1, characterized in that the slot (2) comprises arc and/or straight segments, the width of the slot (2) increasing in the direction of the q-axis in the direction from both sides of the q-axis.

4. The rotor of an electric machine according to claim 1, characterized in that the sum of the widths of the q-axis filling slot (4) and the slit slot (2) in the q-axis direction is m1+ ∑ m2, and the width of the rotor shaft hole (6) to the outer circle of the rotor is m3, (m1+ ∑ m2)/m3 is 0.3-0.5.

5. An electric machine rotor as claimed in claim 4, characterised in that (m1+ ∑ m2)/m3 is 0.35-0.45.

6. The electric machine rotor according to claim 1, characterized in that the minimum width of the magnetic conduction channel (7) between two adjacent non-independent filling grooves (3) is W, the minimum width of the magnetic conduction channel (7) between the slit grooves (2) in the same layer with the two non-independent filling grooves (3) is d, W ≧ d.

7. 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%.

8. An electric machine rotor according to claim 7, 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%.

9. The electric machine rotor according to claim 1, characterized in that, in a cross section perpendicular to the central axis of the rotor core (1), an included angle α 1 formed by a line connecting both ends of the q-axis filling groove (4) and the central axis of the rotor core (1) satisfies 20 ° ≦ α 1 ≦ 60 °.

10. An electric machine rotor according to claim 1, characterised in that the non-separate filling groove (3) forms a magnetic barrier layer with the slit groove (2) of the same layer, the q-axis filling groove (4) forms a magnetic barrier layer, and the minimum distance h1 between the magnetic barrier layer and the outer circle of the rotor satisfies h1 ≧ σ, σ being the width of the air gap between the stator and the rotor.

11. The motor rotor as recited in claim 1, wherein the non-independent filling grooves (3) and the slit grooves (2) of the same layer form a magnetic barrier layer, the q-axis filling grooves (4) form a magnetic barrier layer, the minimum width of the magnetic conduction channel (7) between two adjacent magnetic barrier layers along the q-axis direction is h3, the minimum width of the magnetic barrier layer with smaller width along the d-axis direction in the two adjacent magnetic barrier layers is h2, and h3 is more than or equal to 1.5h 2.

12. The motor rotor as recited in claim 1, characterized in that the q-axis filling grooves (4) under the same pole are of a segmented structure, and a dividing rib (5) is arranged between the groove sections (8) of two adjacent q-axis filling grooves (4).

13. An electric machine rotor according to claim 12, characterized in that the dividing rib (5) between two adjacent groove segments (8) has a width in the d-axis direction of x1, x1 > 0.1s1, x1 > 0.1s2, and x1 > 0.1(s1+ s2), where s1 is the maximum width in the d-axis direction of one of the two adjacent groove segments (8) and s2 is the maximum width in the d-axis direction of the other one of the two adjacent groove segments (8).

14. The rotor according to claim 12, characterised in that the sum of the widths in the d-axis direction of the dividing ribs (5) between the groove sections (8) of the q-axis filling grooves (4) for the same pole is Σ x1, ∑ x1 > 0.1 Σ (s1+ s2), where Σ (s1+ s2) is the sum of the widths in the d-axis direction of the q-axis filling grooves.

15. An electric machine rotor according to claim 12, characterized in that the width of the dividing rib (5) between two adjacent groove segments (8) in the direction of the d-axis is x1, x1 ≧ σ, σ being the width of the air gap between the stator and the rotor.

16. An electric machine rotor, according to claim 12, characterized in that the difference in area of the groove segments (8) under the same pole is within ± 15%.

17. The electric machine rotor according to claim 1, characterized in that the maximum width of the rotor shaft bore (6) in the q-axis direction is smaller than or equal to the maximum width of the rotor shaft bore (6) in the d-axis direction.

18. An electric machine rotor according to claim 17, characterized in that the rotor shaft bore (6) consists of arc segments and/or straight segments.

19. An electric machine rotor according to any of claims 1-18, characterized in that at least part of the filled slots are filled with an electrically and magnetically non-conductive material and short-circuited by end rings (12) at both ends of the rotor core (1), forming a squirrel cage.

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