CN216851462U

CN216851462U - Motor rotor and self-starting synchronous reluctance motor

Info

Publication number: CN216851462U
Application number: CN202220213541.2U
Authority: CN
Inventors: 胡余生; 陈彬; 廖克亮; 童童
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, still including being located between Q axle magnetic barrier groove (2) and central shaft hole (4) and along the D axle magnetic barrier groove that D axle direction extends, D axle magnetic barrier groove is including the outside that is located both ends cast aluminium groove (3), be located the epaxial middle cast aluminium groove (5) of Q and be located outside cast aluminium groove (3) and middle cast aluminium groove (5) between cast aluminium groove (6), middle cast aluminium groove (5) and non-cast aluminium groove (6) between, it all is provided with interior magnetic bridge (8) between aluminium groove (3) and the non-cast aluminium groove (6) to cast the outside. According to the motor rotor, when the motor rotor carries out conducting bar die-casting, the key part can be supported, and deformation of the motor rotor during conducting bar die-casting is avoided.

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 starting stage of the self-starting synchronous reluctance motor mainly depends on asynchronous torque generated by cutting stator magnetic induction lines by rotor conducting bars. The rotor conducting bars are generally made of pure aluminum materials and are filled in the rotor cast aluminum grooves in a high-pressure die casting mode. Because the rotor of the self-starting synchronous reluctance motor is provided with a large number of slots, the structural strength is weak, the conducting bar is easy to deform during die casting, and the supporting needs to be provided at key positions.

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 support key position when motor rotor carries out the conducting bar die-casting, avoids motor rotor to take place to warp when the conducting bar die-casting.

In order to solve the problem, 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 the Q axle magnetic barrier groove that is located the Q axle outside, still including being located between Q axle magnetic barrier groove and the central shaft hole and along the D axle magnetic barrier groove that the D axle direction extends, D axle magnetic barrier groove is including the outside cast aluminium groove that is located both ends, be located the epaxial middle cast aluminium groove of Q and be located the outside cast aluminium groove and the middle cast aluminium groove between the aluminium groove, middle cast aluminium groove and non-cast aluminium groove, all be provided with interior magnetic bridge between the outside cast aluminium groove and the non-cast aluminium groove.

Preferably, the D-axis magnetic barrier groove is symmetrical about the Q-axis.

Preferably, end rings are arranged at two ends of the rotor core, conductive and non-magnetic materials are filled in the Q-axis magnetic barrier groove, the middle cast aluminum groove and the outer cast aluminum groove to form conducting bars, and part or all of the conducting bars are in short circuit through the end rings to form a loop.

Preferably, the end ring is located on an outer circumferential side of the non-cast aluminum groove.

Preferably, the end ring is located on an outer peripheral side of an inner edge of the outer cast aluminum groove.

Preferably, the width of the D-axis magnetic barrier groove along the D-axis direction is LN, the width of the middle cast aluminum groove along the D-axis direction is WN, and N is the number of layers of the D-axis magnetic barrier groove along the Q-axis direction, wherein

Preferably, the width of the internal magnetic bridge between the intermediate cast aluminum groove and the non-cast aluminum groove along the D-axis direction is CT, and C is more than or equal to 0.1mm_T≤1.5mm。

Preferably, the inner bore of the end ring is a kidney-shaped bore.

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 the Q axle magnetic barrier groove that is located the Q axle outside, still including being located between Q axle magnetic barrier groove and the central shaft hole and along the D axle magnetic barrier groove that the D axle direction extends, D axle magnetic barrier groove is including the outside cast aluminium groove that is located both ends, be located the epaxial middle cast aluminium groove of Q and be located the outside cast aluminium groove and the middle cast aluminium groove between the aluminium groove, middle cast aluminium groove and the non-cast aluminium groove, all be provided with interior magnetic bridge between the aluminium groove is cast in the outside and the non-cast aluminium groove. This electric motor rotor is through separating D axle magnetic barrier groove, cast aluminium groove in the middle of forming on the Q axle, conductor in can utilizing the cast aluminium groove of middle cast aluminium groove forms the support to electric motor rotor key part in the cast aluminium in-process of cast aluminium groove in the outside, prevent that the cast aluminium in-process of cast aluminium groove in the outside, because D axle magnetic barrier groove fluting is too much and the atress warp, avoid electric motor rotor to take place to warp when the conducting bar die-casting, improve electric motor rotor's cast aluminium performance, can utilize the conducting bar in cast aluminium groove in the outside and the Q axle magnetic barrier groove to improve the startability of motor simultaneously.

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 view of a rotor core structure of a rotor of an electric machine according to an embodiment of the present application;

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 of LN/WN versus motor efficiency and safety factor for a motor rotor according to an embodiment of the present application;

fig. 5 is a graph of a relationship between an inner magnetic bridge width CT of a motor rotor and motor efficiency and a safety factor according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotor core; 2. a Q-axis magnetic barrier groove; 3. casting an aluminum groove on the outer side; 4. a central shaft hole; 5. casting an aluminum groove in the middle; 6. a non-cast aluminum trough; 7. an end ring; 8. an inner magnetic bridge; 9. and (7) conducting strips.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, a motor rotor 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 the outermost side of a Q-axis, and further includes a D-axis magnetic barrier groove located between the Q-axis magnetic barrier groove 2 and the central shaft hole 4 and extending along a D-axis direction, the D-axis magnetic barrier groove includes an outer-side aluminum casting groove 3 located at both ends, an intermediate aluminum casting groove 5 located on the Q-axis, and a non-aluminum casting groove 6 located between the outer-side aluminum casting groove 3 and the intermediate aluminum casting groove 5, and an inner magnetic bridge 8 is disposed between the intermediate aluminum casting groove 5 and the non-aluminum casting groove 6, and between the outer-side aluminum casting groove 3 and the non-aluminum casting groove 6.

This electric motor rotor is through separating D axle magnetic barrier groove, cast aluminium groove 5 in the middle of forming on the Q axle, the conducting bar 9 in can utilizing middle cast aluminium groove 5 forms the support to electric motor rotor key position in 3 cast aluminium in-process in the aluminium grooves of cast aluminium in the outside, prevent 3 cast aluminium in-process in the aluminium groove of cast aluminium in the outside, because D axle magnetic barrier groove fluting is too much and the atress warp, avoid electric motor rotor to take place to warp when the conducting bar die-casting, improve electric motor rotor's cast aluminium performance, can utilize the conducting bar 9 in 3 and the Q axle magnetic barrier groove 2 of cast aluminium in the outside to improve the startability of motor simultaneously.

In one embodiment, the D-axis magnetic barrier grooves are symmetrical about the Q axis, so that the supporting force provided by the conducting bars in the middle aluminum casting grooves 5 on two sides of the Q axis in the aluminum casting process of the outer aluminum casting grooves 3 on two sides is balanced, the stress balance of the motor rotor in the aluminum casting process is improved, and the aluminum casting forming quality is improved.

In this embodiment, the channel formed between the adjacent D-axis magnetic barrier slots is a magnetic conduction channel, and a magnetic path channel can be formed in the working process of the motor for magnetic lines 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 grooves 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, end rings 7 are arranged at two ends of the rotor core 1, the Q-axis magnetic barrier groove 2, the middle cast aluminum groove 5 and the outer cast aluminum groove 3 are filled with conductive and non-conductive materials to form conducting bars 9, and part or all of the conducting bars 9 are in short circuit through the end rings 7 to form a loop. The electrically and magnetically nonconductive material is, for example, aluminum or copper. The end ring 7 is made of an electrically and magnetically conductive material, as is the case with the conducting bars 9.

In one embodiment, the end ring 7 is located at the outer periphery side of the non-cast aluminum groove 6, so that the conductive and non-magnetic material can be prevented from entering the non-cast aluminum groove 6 during the aluminum casting process, the end ring 7 and the conducting bars 9 in the outer cast aluminum groove 3 can form a short circuit ring, meanwhile, the influence of the non-cast aluminum groove 6 is avoided, and the reliability of the end ring 7 during the aluminum casting process is improved.

In one embodiment, the end ring 7 is located on the outer periphery side of the inner edge of the outer aluminum casting groove 3, which not only ensures that the end ring 7 and the conducting bars 9 in the outer aluminum casting groove 3 form a short-circuit ring structure, but also enables the conductive non-magnetic material to be located on the outer side of the inner magnetic bridge 8 on the inner edge of the outer aluminum casting groove 3 in the aluminum casting process of the end ring 7, and more effectively prevents the conductive non-magnetic material from entering the non-aluminum casting groove 6 through the inner magnetic bridge 8 in the forming process of the end ring 7.

In one embodiment, the width of the D-axis magnetic barrier groove along the D-axis direction is LN, the width of the middle cast aluminum groove 5 along the D-axis direction is WN, and N is the number of layers of the D-axis magnetic barrier groove along the Q-axis direction, wherein

Through the proportional relation between injecing LN and WN, can inject the width of middle cast aluminium groove 5 along D axle direction, make middle cast aluminium groove 5 can be associated along the total width of D axle direction with D axle magnetic barrier groove, thereby make middle cast aluminium groove 5 along the width of D axle direction change along the total width of D axle direction along with D axle magnetic barrier groove, can keep suitable width all the time, thereby when guaranteeing that electric motor rotor has stronger structural strength, avoid middle cast aluminium groove 5 width too wide to make the interior magnetic bridge 8 between middle cast aluminium groove 5 and the non-cast aluminium groove 6 be closer to the excircle, lead to increasing magnetic leakage influence performance. Referring to fig. 4 in combination, the proportional relationship between LN and WN is limited to the above range, which can ensure that the balance between the safety factor of the motor and the efficiency of the motor is optimal, thereby effectively improving the overall performance of the motor.

In one embodiment, the width of the internal magnetic bridge 8 between the intermediate cast aluminum groove 5 and the non-cast aluminum groove 6 along the D-axis direction is CT, 0.1mm ≦ C_T≤1.5mm。

In this embodiment, interior magnetic bridge 8 is undertaking the effect of the magnetic conduction passageway of connecting D axle magnetic barrier groove both sides, consequently, need have sufficient width, guarantee that interior magnetic bridge 8 can provide sufficient joint strength, interior magnetic bridge 8 will cause the motor magnetic leakage simultaneously, influence the motor performance, therefore, the width of interior magnetic bridge 8 can not be too wide again, it is shown with reference to fig. 5 to combine, through prescribing a limit to interior magnetic bridge 8 for foretell width range, can provide sufficient structural strength in guaranteeing interior magnetic bridge 8, effectively avoid the motor magnetic leakage too big and too influence the motor performance, consequently, can realize the preferred balance of motor efficiency and factor of safety, effectively improve the motor wholeness ability.

In one embodiment, the inner bore of the end ring 7 is a kidney-shaped bore. The inner bore of the end ring 7 may also have other shapes, such as oval or diamond, etc.

In one embodiment, an outer magnetic bridge is provided on an outer peripheral side of the magnetic barrier groove.

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 application is intended to cover various modifications, equivalent arrangements, and adaptations of the present application without departing from the spirit and scope of the present application. 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 Q axle magnetic barrier groove (2) that are located the Q axle outside, still including being located Q axle magnetic barrier groove (2) with the D axle magnetic barrier groove that extends along the D axle direction between central shaft hole (4), D axle magnetic barrier groove is including the outside that is located both ends cast aluminium groove (3), be located Q epaxial middle cast aluminium groove (5) and be located the outside cast aluminium groove (3) with non-cast aluminium groove (6) between middle cast aluminium groove (5), middle cast aluminium groove (5) with between non-cast aluminium groove (6) the outside cast aluminium groove (3) with all be provided with interior magnetic bridge (8) between non-cast aluminium groove (6).

2. The electric machine rotor as recited in claim 1, wherein the D-axis flux-barrier slots are symmetrical about a Q-axis.

3. The motor rotor as recited in claim 1, characterized in that end rings (7) are arranged at two ends of the rotor core (1), the Q-axis magnetic barrier groove (2), the middle cast aluminum groove (5) and the outer cast aluminum groove (3) are filled with an electrically and magnetically non-conductive material to form conducting bars (9), and part or all of the conducting bars (9) are short-circuited through the end rings (7) to form a loop.

4. An electric machine rotor according to claim 3, characterised in that the end ring (7) is located on the outer circumferential side of the non-cast aluminium slot (6).

5. An electric machine rotor according to claim 4, characterised in that the end ring (7) is located on the outer circumference side of the inner edge of the outer cast aluminium slot (3).

6. The electric motor rotor as claimed in claim 1, wherein the width of the D-axis magnetic barrier groove in the D-axis direction is LN, the width of the intermediate cast aluminum groove (5) in the D-axis direction is WN, and N is the number of layers of the D-axis magnetic barrier groove in the Q-axis direction, wherein

7. The machine rotor according to claim 1, characterised in that the width of the inner magnetic bridge (8) between the intermediate cast aluminium groove (5) and the non-cast aluminium groove (6) in the direction of the D axis is CT, 0.1mm ≦ C_T≤1.5mm。

8. An electric machine rotor according to claim 3, characterised in that the inner bore of the end ring (7) is a kidney-shaped bore.

9. 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.

10. 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 9.