CN216851463U

CN216851463U - Motor rotor and self-starting synchronous reluctance motor

Info

Publication number: CN216851463U
Application number: CN202220213555.4U
Authority: CN
Inventors: 陈彬; 杨福源; 廖克亮; 胡绳
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-06-28
Anticipated expiration: 2032-01-26

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 magnetic barrier groove and central shaft hole (4) on rotor core (1), the magnetic barrier groove is including Q axle magnetic barrier groove (2) that are located the Q axle outside and D axle magnetic barrier groove (3) that are located between Q axle magnetic barrier groove (2) and central shaft hole (4) and extend along the D axle direction, D axle magnetic barrier groove (3) are including non-cast aluminium district (6) and cast aluminium district (5) that are located non-cast aluminium district (6) both ends, Q axle magnetic barrier groove (2) and cast aluminium district (5) are filled there is electrically conductive magnetic conduction non-material, cast aluminium district (5) and non-cast aluminium district (6) intercommunication. According to the motor rotor of this application, can reduce rotor magnetic leakage, improve salient pole ratio, improve 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 direct-start synchronous reluctance motor combines the structural characteristics of an induction motor and the synchronous reluctance motor, realizes starting by generating torque through cage induction, realizes constant-speed operation by generating reluctance torque through the difference of rotor inductance, and can be directly switched in a power supply to realize starting operation. Compared with a direct-start permanent magnet motor, the direct-start synchronous reluctance motor has the advantages of no rare earth permanent magnet material, no demagnetization problem, low motor cost and good reliability. Compared with an asynchronous motor, the motor has high efficiency and constant rotating speed. The direct-start synchronous reluctance motor can be started automatically, a controller is not needed for starting, and the cost is further reduced.

The self-starting motor generates starting torque by cutting a stator magnetic field through a rotor conducting bar, and the rotor conducting bar is made of an electric and non-magnetic conducting material, usually pure aluminum, and is filled in a high-pressure casting mode. After the aluminum casting, end rings are formed at two ends of the rotor to short out all or part of the conducting bars.

The rotor iron core is provided with a plurality of groups of identical air slots, and the number of the groups of the air slots is the number of rotor poles; according to the shape of the air groove, the radial direction parallel to the air groove is called D axis, and the radial direction perpendicular to the air groove is called Q axis; the air groove is divided into a plurality of layers along the axis Q; each layer of air groove is divided into a D-axis cast aluminum groove, a Q-axis cast aluminum groove and a non-cast aluminum groove; the cast aluminum groove and the non-cast aluminum groove are separated by an inner magnetic bridge; the air slot and the outer circle of the rotor are separated by an outer magnetic bridge.

The rotor is provided with a plurality of grooves, so the structural strength of the rotor is generally lower, only the outer magnetic bridge is difficult to meet the structural strength requirement when the motor rotates at high speed, and on the other hand, the magnetic bridge is also used for limiting the flow direction of aluminum liquid during aluminum casting and ensuring the shape of the conducting bars. However, the magnetic force lines form a leakage magnetic path through the magnetic bridge, which affects the salient pole ratio and reduces the motor efficiency.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a motor rotor and self-starting synchronous reluctance motor, can reduce rotor magnetic leakage, improves salient pole ratio, improves motor efficiency.

In order to solve the problem, the application provides a motor rotor, including rotor core, last magnetic barrier groove and the central axis hole of being provided with of rotor core, the magnetic barrier groove is including being located the Q axle magnetic barrier groove in the Q axle outside and being located between Q axle magnetic barrier groove and the central axis hole and along the D axle magnetic barrier groove of D axle direction extension, D axle magnetic barrier groove is including non-cast aluminium district and the cast aluminium district that is located non-cast aluminium district both ends, Q axle magnetic barrier groove and cast aluminium district pack have electrically conductive non-magnetic material, cast aluminium district and non-cast aluminium district intercommunication.

Preferably, the rotor core is provided at both axial ends with end rings, which are connected to the electrically non-conductive material in the cast aluminum region to form short circuit rings.

Preferably, the end ring at the corresponding position of each D-axis magnetic barrier groove is symmetrical about the Q axis, the interval between the inner rings of the end ring corresponding to a single D-axis magnetic barrier groove along the direction parallel to the D axis is 2Len, the interval between two cast aluminum zones of the D-axis magnetic barrier groove along the direction parallel to the D axis is 2Ln, Len is larger than or equal to Ln, and n is the number of layers of the D-axis magnetic barrier groove along the direction of the Q axis from the D axis.

Preferably, the rotor core has an outer diameter Dr, and the interval 2Len between the inner rings of the end rings corresponding to the D-axis barrier grooves in each layer along the direction parallel to the D-axis satisfies

Preferably, the rotor core has an outer diameter Dr, and the two cast-aluminum regions of the D-axis barrier slot are spaced apart by 2Ln along a direction parallel to the D-axis, wherein Ln satisfies

Preferably, the rotor core has a height H, the end rings have an axial height HT,

preferably, the central axial bore has a diameter Dsft, the rotor core has an outer diameter Dr, the end rings have an outer diameter D,

and is

Preferably, an outer magnetic bridge is provided on an outer peripheral side of the magnetic barrier groove.

According to another aspect of the present application, there is provided a self-starting synchronous reluctance motor comprising a motor rotor as described above.

The application provides a motor rotor, including rotor core, last magnetic barrier groove and the central shaft hole of being provided with of rotor core, the magnetic barrier groove is including being located the Q axle magnetic barrier groove of Q axle outside and being located Q axle magnetic barrier groove with the D axle magnetic barrier groove that extends along the D axle direction between the central shaft hole, D axle magnetic barrier groove includes that non-cast aluminium distinguishes and is located the cast aluminium district at non-cast aluminium district both ends, Q axle magnetic barrier groove with cast aluminium district packs has electrically conductive non-magnetic material, cast aluminium district with non-cast aluminium district intercommunication. This electric motor rotor falls into cast aluminium district and non-cast aluminium district with rotor core's D axle magnetic barrier groove to pack at cast aluminium district and electrically conduct magnetic material not, make cast aluminium district and non-cast aluminium district intercommunication, thereby can get rid of the interior magnetic bridge between cast aluminium district and the non-cast aluminium district, form the electric motor rotor who does not have interior magnetic bridge, effectively reduce the rotor magnetic leakage, improve rotor salient pole ratio, improve motor efficiency and motor performance.

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 diagram of a rotor of an electric machine according to an embodiment of the present application;

FIG. 3 is a schematic view of a rotor core structure of a rotor of an electric machine according to an embodiment of the present application;

FIG. 4 is a longitudinal cross-sectional view of a rotor of an electric machine according to an embodiment of the present application;

FIG. 5 is a graph of the starting capability of 2Ln/Dr for a rotor of an electric machine according to an embodiment of the present application;

fig. 6 is a graph comparing the efficiency of a rotor of an electric machine according to an embodiment of the present application with a rotor of an electric machine having an inner magnetic bridge.

The reference numerals are represented as:

1. a rotor core; 2. a Q-axis magnetic barrier groove; 3. a D-axis magnetic barrier groove; 4. a central shaft hole; 5. an aluminum casting area; 6. a non-cast aluminum zone; 7. and an end ring.

Detailed Description

Referring to fig. 1 to 6 in combination, according to an embodiment of the present application, a rotor of an electric machine includes a rotor core 1, a magnetic barrier groove and a central shaft hole 4 are disposed on the rotor core 1, the magnetic barrier groove includes a Q-axis magnetic barrier groove 2 located on an outermost side of a Q-axis and a D-axis magnetic barrier groove 3 located between the Q-axis magnetic barrier groove 2 and the central shaft hole 4 and extending in a D-axis direction, the D-axis magnetic barrier groove 3 includes an unmolded aluminum region 6 and cast aluminum regions 5 located at two ends of the unmolded aluminum region 6, the Q-axis magnetic barrier groove 2 and the cast aluminum regions 5 are filled with an electrically and magnetically non-conductive material, and the cast aluminum region 5 and the unmolded aluminum region 6 are communicated.

The material filled in the cast aluminum region 5 in the present application is a conductive and non-magnetic material, the cast aluminum region 5 is only named for the filled region, and is not limited to the filled material, as long as the conductive and non-magnetic material capable of being used as a conductive strip can be filled in the cast aluminum region 5, and the conductive and non-magnetic material is, for example, aluminum or red copper.

This electric motor rotor divides into cast aluminium district 5 and non-cast aluminium district 6 with D axle magnetic barrier groove 3 of rotor core 1 to pack electrically conductive non-magnetic material in cast aluminium district 5 intussuseption, make cast aluminium district 5 and non-cast aluminium district 6 intercommunication, thereby can get rid of the interior magnetic bridge between cast aluminium district 5 and the non-cast aluminium district 6, form the electric motor rotor who does not have interior magnetic bridge, effectively reduce the rotor magnetic leakage, improve rotor salient pole ratio, improve motor efficiency and motor performance.

Because the motor rotor in the application is not provided with the inner magnetic bridge, the shapes of the rotor conducting bar formed by filling the conductive and non-magnetic material and the end rings 7 at two ends can be flexibly adjusted, the starting capability of the motor can be adjusted to be optimal, and the starting performance of the motor is improved. Referring to fig. 6 in combination, the performance of the internal magnetic bridge-free motor of the embodiment of the present application is improved by at least 1% compared to the motor with internal magnetic bridge.

In addition, because the inner magnetic bridge is omitted, the filling material in the cast aluminum zone 5 can be used for replacing the function of the inner magnetic bridge, and the structural strength of the motor rotor can be greatly improved.

In one embodiment, the rotor core 1 is provided with end rings 7 at both axial ends, the end rings 7 being connected to the electrically non-conductive material in the cast aluminum region 5 to form short circuit rings.

In this embodiment, because do not set up interior magnetic bridge, consequently when casting aluminium, need replace interior magnetic bridge through the frock, and take out the frock after the completion is cast aluminium, thereby obtain the electric motor rotor who does not have interior magnetic bridge, take out the frock after casting aluminium in order to accomplish conveniently, end ring 7 need flow the hole of stepping down in the position of installation frock, make things convenient for the frock to take out from the hole of stepping down, after the frock takes out, can leave the hole of stepping down on the end ring 7, and with rotor core 1 in take out the space intercommunication that leaves behind the frock, form heat dissipation channel, can enough promote rotor core 1's heat-sinking capability, the material quantity has been reduced again, make the motor lightweight, can reduce cost simultaneously.

The channel formed between the adjacent D-axis magnetic barrier grooves 3 is a magnetic conduction channel, and a magnetic circuit channel can be formed in the working process of the motor to allow magnetic lines of force to flow through.

The rotor core 1 is provided with a plurality of groups of air slots with the same shape as the magnetic barrier slots, and the number of the groups of the air slots is the number of the rotor poles. Each group of air grooves is divided into a plurality of layers along the axis Q, each layer of air groove only comprises one groove, each layer of air groove is adjacent to the magnetic conduction channel along the axis Q, and the outermost edge along the axis D is provided with an external magnetic bridge which is adjacent to the air gap.

In one embodiment, the end rings 7 at the corresponding positions of each D-axis magnetic barrier groove 3 are symmetrical about the Q axis, the interval between the inner rings of the end rings 7 corresponding to a single D-axis magnetic barrier groove 3 along the direction parallel to the D axis is 2Len, the interval between two cast aluminum zones 5 of the D-axis magnetic barrier groove 3 along the direction parallel to the D axis is 2Ln, Len ≧ Ln, where n is the number of layers of the D-axis magnetic barrier groove 3 along the Q axis from the D axis.

In the embodiment, the end ring 7 is in an annular structure, and since the tooling serves as the boundary of the cast aluminum region 5, in order to ensure that the end ring 7 does not interfere with the removal of the tooling, the distance between the position of the inner ring of the end ring 7 corresponding to the D-axis barrier groove 3 and the Q-axis should be greater than the distance between the boundary of the cast aluminum region 5 of the D-axis barrier groove 3 and the Q-axis, that is Len ≧ Ln, so as to leave sufficient abdicating space.

In one embodiment, the rotor core 1 has an outer diameter Dr, and the interval 2Len between the inner rings of the end rings 7 corresponding to the D-axis barrier grooves 3 in each layer along the direction parallel to the D-axis satisfies

Taking FIG. 2 as an example, Len should satisfy

The rotor core 1 has an outer diameter Dr, and the two cast-aluminum regions 5 of the D-axis barrier groove 3 are spaced apart by 2Ln in a direction parallel to the D-axis, wherein Ln satisfies

Taking FIG. 2 as an example, Ln should satisfy

Therefore, the sufficient width of the cast aluminum area 5 is ensured, the self-starting requirement of the motor can be met, and the self-starting capability of the motor is improved.

When the aluminum casting area 5 is designed, the large width of the aluminum casting area 5 can ensure that the motor has better starting capability, but if the width is too large, eddy current of the aluminum conducting bar and the end ring 7 is increased when the rotating speed is synchronous, the motor efficiency is reduced, heating is intensified, meanwhile, the ventilation area of the rotor is reduced, and the heating is intensified; the motor with the width of the cast aluminum zone being too small has poor starting capability and cannot reach synchronous rotating speed, the range is limited by combining two aspects, and a better effect can be achieved.

In one embodiment, the rotor core 1 has a height H, the end rings 7 have an axial height HT,

thereby, the end ring 7 has a sufficient axial height, and the resistance can be reduced to improve the starting capability.

In one embodiment, the central shaft bore 4 has a diameter Dsft, the rotor core 1 has an outer diameter Dr, the end rings 7 have an outer diameter D,

and is

So that the end ring 7 can be positioned in the rotor core 1Within the outer circumference and the central shaft bore 4, the end rings 7 are prevented from going beyond the rotor core 1.

In one embodiment, the outer magnetic bridges are provided on the outer circumferential sides of the magnetic barrier slots, which can improve the structural strength of the rotor core 1.

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

According to an embodiment of the application, the manufacturing method of the motor rotor includes: processing a rotor punching sheet with a Q-axis magnetic barrier groove 2 and a D-axis magnetic barrier groove 3; overlapping the rotor punching sheets into a rotor core 1; inserting a supporting tool into a non-cast aluminum area 6 of a D-axis magnetic barrier groove 3 of a rotor core 1, and aligning the edge of the supporting tool with the edge of a cast aluminum area 5 of the D-axis magnetic barrier groove 3; filling an electric and non-magnetic conductive material in the cast aluminum area 5 of the rotor core 1, forming end rings 7 at two ends of the rotor core 1, and positioning a support tool at the inner side of the inner periphery of each end ring 7; and taking out the supporting tool.

In this embodiment, the supporting tool is used for limiting the flow direction of the electrically conductive and non-magnetically conductive material instead of the inner magnetic bridge in the casting process, and separating the cast aluminum region 5 and the non-cast aluminum region 6, in this embodiment, the electrically conductive and non-magnetically conductive material is filled in the D-axis magnetic barrier groove 3, the electrically conductive and non-magnetically conductive material is filled in only the cast aluminum regions 5 at two ends of each layer of D-axis magnetic barrier groove 3 in the D-axis direction, and the non-cast aluminum region 6 between the cast aluminum regions 5 at two ends is still air.

The conductive and non-magnetic material is aluminum or red copper.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The utility model provides a motor rotor, its characterized in that, includes rotor core (1), be provided with magnetic barrier groove and central shaft hole (4) on rotor core (1), the magnetic barrier groove is including being located Q axle magnetic barrier groove (2) in the Q axle outside and being located Q axle magnetic barrier groove (2) with D axle magnetic barrier groove (3) that extend along the D axle direction between central shaft hole (4), D axle magnetic barrier groove (3) are including non-cast aluminium district (6) and being located cast aluminium district (5) at non-cast aluminium district (6) both ends, Q axle magnetic barrier groove (2) with cast aluminium district (5) are filled with electrically conductive non-magnetic material, cast aluminium district (5) with non-cast aluminium district (6) intercommunication.

2. An electric machine rotor according to claim 1, characterized in that the rotor core (1) is provided with end rings (7) at both axial ends, the end rings (7) being connected with the electrically non-conductive material in the cast aluminium zone (5) to form short circuit rings.

3. The rotor of an electric machine according to claim 2, characterized in that the end rings (7) at the corresponding positions of each of the D-axis magnetic barrier grooves (3) are symmetrical about the Q-axis, the interval between the inner rings of the end rings (7) corresponding to a single D-axis magnetic barrier groove (3) along the direction parallel to the D-axis is 2Len, the interval between two cast aluminum zones (5) of the D-axis magnetic barrier groove (3) along the direction parallel to the D-axis is 2Ln, Len ≧ Ln, where n is the number of layers of the D-axis magnetic barrier groove (3) along the direction of the Q-axis from the D-axis.

4. An electric machine rotor according to claim 3, characterized in that the outer diameter of the rotor core (1) is Dr, and the interval 2Len between the inner rings of the end ring (7) corresponding to each layer of the D-axis barrier slots (3) along the direction parallel to the D-axis satisfies

5. Electric machine rotor according to claim 1, characterised in that the rotor core (1)) Has an outer diameter Dr, and has a spacing of 2Ln between two cast-aluminum zones (5) of the D-axis magnetic barrier groove (3) in a direction parallel to the D-axis, wherein Ln satisfies

6. An electric machine rotor according to claim 2, characterized in that the rotor core (1) has a height H and the end rings (7) have an axial height HT,

7. an electric machine rotor according to claim 2, characterized in that the diameter of the central shaft hole (4) is Dsft, the outer diameter of the rotor core (1) is Dr, the outer diameter of the end ring (7) is D,

and is

8. The electric machine rotor as recited in claim 1, wherein an outer magnetic bridge is provided on an outer peripheral side of the magnetic barrier groove.

9. A self-starting synchronous reluctance machine comprising a machine rotor, characterized in that the machine rotor is as claimed in any one of claims 1 to 8.