CN209787005U - Motor rotor - Google Patents

Abstract

the utility model relates to an electric motor rotor, include: the outer circle surface of the iron core is provided with a plurality of axially extending iron core grooves; the two conductive end parts are connected with the two ends of the iron core in an insulating way, and conductive end grooves matched with the positions of the iron core grooves are formed in the outer circle surfaces of the conductive end parts; a plurality of busbar, the busbar include at least part set up in the iron core recess and with iron core recess insulation complex iron core cooperation portion to and at least part set up in the electrically conductive end recess and with electrically conductive end recess electric connection's electrically conductive end cooperation portion, the iron core cooperation portion with electrically conductive end cooperation portion electric connection. According to the invention, the iron core groove for installing the conductive bar is arranged on the surface of the excircle of the iron core, the conductive bar is simply installed and firmly fixed, the assembling time of the motor rotor is shortened, and the processing efficiency is improved.

Description

motor rotor

Technical Field

the invention relates to the field of motors, in particular to a motor rotor.

Background

At present, a motor rotor in an alternating current asynchronous motor generally adopts a cast aluminum rotor or a copper bar rotor, and is embedded into an iron core of the motor in a welding or die casting mode.

The copper bar rotor has high conductive efficiency and low heat emission, and is more widely applied compared with a cast aluminum rotor. The common processing method is to insert a copper bar rotor into a rotor slot on an iron core, and then weld the copper bar rotor with conductive end parts at two ends of the iron core to form a short-circuit winding. Because the rotor slots are generally arranged on the inner side of the iron core, the copper bar rotors are required to be inserted into the rotor slots one by one from the axial direction, and the processing time is long; in addition, when the length tolerance of the copper bar rotor exceeds a certain range, a large gap can be formed between the copper bar rotor and the conductive end part, poor welding is easily caused, and the performance of the whole motor rotor is affected.

Disclosure of Invention

The invention aims to provide a motor rotor, which solves the problems in the related technology of the motor rotor at present, so that the motor rotor is simple and quick to process and manufacture and has stable performance.

In order to achieve one of the above objects, the present invention provides a rotor for an electric motor, comprising: the outer circle surface of the iron core is provided with a plurality of axially extending iron core grooves; the two conductive end parts are connected with the two ends of the iron core in an insulating way, and conductive end grooves matched with the positions of the iron core grooves are formed in the outer circle surfaces of the conductive end parts; a plurality of busbar, the busbar include at least part set up in the iron core recess and with iron core recess insulation complex iron core cooperation portion to and at least part set up in the electrically conductive end recess and with electrically conductive end recess electric connection's electrically conductive end cooperation portion, the iron core cooperation portion with electrically conductive end cooperation portion electric connection.

As a further improvement of an embodiment of the present invention, two side surfaces of the conductive terminal fitting portion are attached to two side walls of the conductive terminal groove.

as a further improvement of an embodiment of the present invention, the conductive terminal fitting part and the conductive terminal groove are welded by electron beam.

As a further improvement of an embodiment of the present invention, the conductive strips are uniformly distributed on the outer circumferential surface of the iron core, and the arc lengths between adjacent conductive strips are equal.

As a further improvement of an embodiment of the present invention, the conductive end portion is further provided with an outer end surface, and a bottom surface of the conductive end groove is connected to the outer end surface through an outer circumferential surface of the conductive end portion.

As a further improvement of an embodiment of the present invention, the cross-sectional shape of the conductive bar is an inverted triangle or an inverted trapezoid.

As a further improvement of an embodiment of the present invention, a bottom surface of the conductive strip is a transitional arc surface, and a top surface of the conductive strip is an arc surface with the same radius as the conductive end.

As a further improvement of an embodiment of the present invention, the conductive end portion is shaped as a dome or a ring.

As a further improvement of an embodiment of the present invention, the conductive end groove extends from a direction facing the core toward a direction away from the core.

As a further improvement of an embodiment of the present invention, the conductive strip and the conductive end portion are made of an oxygen-free copper material.

Compared with the prior art, the invention has the beneficial effects that: a iron core recess for installing the busbar sets up in the excircle surface of iron core, and the busbar installation is simple and fixed firm, and electric motor rotor's equipment time shortens, machining efficiency improves.

Drawings

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

FIG. 2 is a schematic diagram of a conductive strip structure according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a conductive strip according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a conductive end portion according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a conductive tip in an embodiment of the invention;

FIG. 6 is a schematic structural diagram of a core according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a core in an embodiment of the invention;

FIG. 8 is a schematic view of a structure of a motor rotor engaged with a hoop ring according to an embodiment of the present invention;

FIG. 9 is a flow chart of a method of manufacturing a rotor for an electric machine in accordance with an embodiment of the present invention;

In the figure: 2. a conductive strip; 22. an iron core fitting part; 23. a conductive terminal fitting portion; 4. an iron core; 41. an iron core groove; 6. a conductive end portion; 61. a conductive end groove; 62. an outer end face; 8. a hoop ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the detailed description of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1 to 8, an embodiment of the present invention provides a rotor of an electric machine, including: the iron core 4 is provided with a plurality of axially extending iron core grooves 41 on the outer circumferential surface of the iron core 4; two conductive end parts 6 which are in insulation connection with two ends of the iron core 4, wherein the outer circle surface of the conductive end parts 6 is provided with conductive end grooves 61 which are matched with the positions of the iron core grooves 41; the plurality of conductive strips 2, the conductive strips 2 include an iron core matching part 22 at least partially disposed in the iron core groove 41 and in insulation fit with the iron core groove 41, and a conductive end matching part 23 at least partially disposed in the conductive end groove 61 and electrically connected with the conductive end groove 61, the iron core matching part 22 being electrically connected with the conductive end matching part 23.

Specifically, the motor rotor comprises an iron core 4, two conductive end parts 6 and a plurality of conductive strips 2, wherein the two conductive end parts 6 are connected with and insulated from two ends of the iron core 4; the outer circle surface of the iron core 4 is provided with a plurality of iron core grooves 41, the outer circle surface of the conductive end part 6 is correspondingly provided with a plurality of conductive end grooves 61, and the grooves formed by the iron core grooves 41 and the conductive end grooves 61 are used for installing the conductive strips 2.

The insulated part of the bus bar 2 connected to the iron core groove 41 is the iron core matching part 22, the part of the bus bar 2 electrically connected to the conductive end groove 61 is the conductive end matching part 23, and the iron core matching part 22 is electrically connected to the conductive end matching part 23.

The conductive end portion 6 has a fixed radius and may preferably be a dome or ring structure. The conductive end grooves 61 are formed in the outer circular surface of the conductive end portion 6, penetrate through the side wall of the conductive end portion 6 facing the iron core 2, and extend towards the central axis of the conductive end portion 6, namely the conductive end grooves 61 are symmetrically distributed on the conductive end portion 6, and the conductive end portion 6 is regular in shape. The number and positions of the iron core grooves 41 and the conductive end grooves 61 are matched, and the number of the conductive strips 2 can be the same as or different from the two. Preferably, the number of the conductive bars 2, the core grooves 41 and the conductive end grooves 61 is the same and the positions thereof are matched.

Therefore, the grooves for mounting the bus bars 2 are jointly formed in the outer circle surfaces of the iron core 4 and the conductive end parts 6, the bus bars 2 can be conveniently and directly inserted into the grooves in the radial direction, and the bus bars and the two conductive end parts 6 at the two ends of the iron core 4 are electrically connected to form a short-circuit winding, so that the motor rotor is simplified in machining and assembling and stable in electrical performance.

optionally, the outer surface of the iron core 4 can be subjected to insulation treatment in advance, and after the motor rotor is integrally assembled, the iron core 4 is in insulation contact with the conductive bar 2 and the conductive end part 6; alternatively, insulating paper or insulating powder may be provided between the core 4 and the conductive bar 2 and the conductive end portion 6, and insulation treatment may be performed simultaneously at the time of assembly.

In addition, the conductive strip 2 can be electrically connected to the conductive end 6 by various methods, such as soldering, crimping, and the like. The electrical connection between the core matching portion 22 and the conductive end matching portion 23 of the conductive strip 2 is not limited to a single type, for example, the conductive strip 2 may be integrally formed, or the conductive end matching portion 23 may be formed by extending the core matching portion 22. The conductive bars 2 are long strips extending in a straight line, and the materials can be aluminum or oxygen-free copper and the like, so that the electrical property of the motor rotor is improved.

Further, two side surfaces of the conductive terminal fitting portion 23 are attached to two side walls of the conductive terminal groove 61.

Further, the conductive terminal fitting portion 23 and the conductive terminal groove 61 are welded by electron beams.

Specifically, the conductive strip 2 and the conductive end portion 6 are electrically connected by an electron beam welding method, that is, two side surfaces of the conductive end matching portion 23 are matched with two side walls of the conductive end groove 61 in shape, and the two side surfaces are pressed and attached to each other for electron beam welding. In the past, when the length tolerance of the conductive bar 2 exceeds the range, the contact gap is too large, poor welding is easily caused by end face welding of the conductive bar 2, after improvement, the influence of the length tolerance on the welding yield can be avoided, the welding quality is improved by carrying out electron beam welding on two side faces of the conductive bar 2, and therefore the performance stability of the motor rotor is guaranteed.

Further, the conductive strips 2 are uniformly distributed on the outer circle surface of the iron core 4, and the arc lengths between the adjacent conductive strips 2 are equal.

The plurality of conductive bars 2 are uniformly distributed on the surface of the outer circle of the iron core 4, so that the torque pulsation can be reduced, the efficiency of the motor rotor is improved, and the motor performance is stable.

Optionally, the number of conductive strips 2 is 70.

Further, the cross-sectional shape of the conductive bar 2 is an inverted triangle or an inverted trapezoid.

further, the bottom surface of the conductive strip 2 is a transitional arc surface, and the top surface of the conductive strip 2 is an arc surface with the same radius as the conductive end 6.

As shown in fig. 2 and 3, the conductive strip 2 is a wedge-shaped structure with an inverted trapezoid cross section. The bottom edge contacting with the iron core 4 is a transition arc, and the bottom edge exposed on the outer circle surface of the iron core 4 is an arc with the same radius as the conductive end part 6. Likewise, the cross section of the conductive strip 2 may be an inverted triangle.

It can be seen that the conductor bars 2 of wedge-shaped configuration can be quickly and easily inserted into the core 4 in the radial direction, and the transition arcs can prevent the dimensional tolerances of the bottom surfaces of the conductor bars 2 from causing contact gaps. After the conductive bar 2 is inserted into the iron core 4 and the conductive end part 6, the appearance shape of the short circuit ring is regular and the electrical performance is stable because the radius of the arc top surface is the same as that of the conductive end part 6. In addition, a hoop ring 8 is conveniently sleeved on the whole motor rotor before welding, pretightening force is applied to the conductive bars 2, mutual stress on welding surfaces is strengthened, and welding precision is guaranteed.

Further, the conductive end portion 6 is shaped as a dome or a ring.

Further, the conductive end groove 61 extends from a direction facing the core 4 toward a direction away from the core 4.

Further, the conductive end portion 6 is further provided with an outer end surface 62, and the bottom surface of the conductive end groove 61 is connected with the outer end surface 62 through the outer circumferential surface of the conductive end portion 6.

As shown in fig. 4 and 5, the conductive terminal grooves 61 are uniformly provided on the outer circumferential surface of the regularly shaped conductive terminal portion 6 and extend in a direction away from the core 4.

Conductive end portion 6 further includes an inner end surface facing iron core 4 and an outer end surface 62 facing away from iron core 4, and conductive end groove 61 is opened in the inner end surface of iron core 4, and the bottom surface of conductive end groove 61 is connected to both outer end surfaces 62 through the outer circumferential surface of conductive end portion 6.

The conductive end portion 6 may also be provided with a hole or aperture in the center thereof, as required for connection to a motor drive shaft. Preferably, the conductive end portion 6 is a round cap structure with a small hole in the center, and the bottom surface of the conductive end groove 61 is in contact connection with the end portion of the conductive bar 2, so that the resistance of the short-circuit winding is minimum, and the power loss can be greatly reduced.

Furthermore, the conducting bar 2 and the conducting end part 6 are made of oxygen-free copper materials, and the oxygen-free copper materials have good conductivity, so that the loss of the motor can be further reduced, and the performance of the motor is improved.

the embodiment of the invention also provides a motor rotor manufacturing method, which comprises the following steps: a plurality of axially extending iron core grooves 41 are formed in the outer circumferential surface of the iron core 4; the outer circle surfaces of the two conductive end parts 6 are provided with conductive end grooves 61 matched with the positions of the iron core grooves 41; respectively corresponding the positions of the conductive end groove 61 and the iron core groove 41, and connecting the two conductive end parts 6 with the two ends of the iron core 4 in an insulating way; the bus bar 2 is inserted into the iron core groove 41 and the conductive end groove 61 in the radial direction of the iron core 4, so that the bus bar 2 is in insulation fit with the iron core groove 41, and the bus bar 2 is electrically connected with the conductive end groove 61.

Further, the step of electrically connecting the conductive bar 2 and the conductive end groove 61 includes: pressing and attaching two side surfaces of the conductive end matching part 23 and two side walls of the conductive end groove 61 to each other to form a welding surface; and carrying out electron beam welding on the welding surface.

Further, before the step of electron beam welding the weld face, the manufacturing method further includes: cup joint in iron core 4 periphery through embracing hoop 8, towards iron core 4 direction extrusion busbar 2.

Further, the step of performing electron beam welding on the welding surface further includes: the integral structure formed by the iron core 4, the two conductive end parts 6, the conductive strips 2 and the hoop rings 8 is sent into the vacuum electron beam cavity and kept still, the electron beam welding gun head moves along the outer circle surface of the conductive end parts 6 to weld all welding surfaces one by one, and the integral structure is moved out of the vacuum electron beam cavity after welding.

Further, after the step of performing electron beam welding on the welding surface, the manufacturing method further includes: the band 8 is removed.

The following describes the method for manufacturing the motor rotor in detail with reference to fig. 9:

The outer circle surface of the iron core 4 is provided with a plurality of axially extending iron core grooves 41, the outer circle surface of the conductive end part 6 is provided with conductive end grooves 61 matched with the positions of the iron core grooves 41, the two conductive end parts 6 are connected with the two sides of the iron core 4 in an insulating mode, and the positions of the iron core grooves 41 and the positions of the conductive end grooves 61 are in one-to-one correspondence.

the bus bar 2 is inserted into the groove formed by the iron core groove 41 and the conductive end groove 61, wherein the iron core matching part 22 of the bus bar 2 is connected with the iron core groove 41 in an insulated manner, and the conductive end matching part 23 of the bus bar 2 is electrically connected with the conductive end part 6 by electron beam welding. Specifically, two side surfaces of the conductive terminal fitting portion 23 are matched with two side walls of the conductive terminal groove 61 in shape, and the two side surfaces are pressed and attached to form an electron beam welding surface.

after all the conductive strips 2 are inserted into the iron core 4 and the conductive end portions 6, a hoop 8 is used for sleeving and pressing all the conductive strips 2, and pretightening force is provided for pressing all the conductive strips 2 inwards. Then, the integral structure formed by the iron core 4, the two conductive end parts 6, the conductive strips 2 and the hoop 8 is sent into a vacuum electron beam cavity and kept still, the electron beam welding gun head moves along the outer circle surface of the conductive end parts 6, and welding surfaces are welded one by one. After all welding surfaces are welded, the hoop 8 is finally removed.

In summary, according to the motor rotor and the manufacturing method thereof provided by the invention, the conductive bars 2 can be inserted into the iron core 4 and the conductive end parts 6 in the radial direction for assembly, and are uniformly distributed on the outer circumferential surface of the iron core 4, and after the assembly is completed, the conductive bars 2 are welded on the side surfaces of the conductive bars by electron beam welding, so that the processing operation of the motor rotor is simplified, the welding yield is improved, and the motor rotor has high conductive efficiency and stable performance.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention and is not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention are included in the scope of the present invention.

Claims (10)

1. An electric machine rotor, comprising:

The outer circle surface of the iron core is provided with a plurality of axially extending iron core grooves;

The two conductive end parts are connected with the two ends of the iron core in an insulating way, and conductive end grooves matched with the positions of the iron core grooves are formed in the outer circle surfaces of the conductive end parts;

A plurality of busbar, the busbar include at least part set up in the iron core recess and with iron core recess insulation complex iron core cooperation portion to and at least part set up in the electrically conductive end recess and with electrically conductive end recess electric connection's electrically conductive end cooperation portion, the iron core cooperation portion with electrically conductive end cooperation portion electric connection.

2. the electric machine rotor as recited in claim 1, wherein two side surfaces of the conductive end engaging portion engage two side walls of the conductive end recess.

3. The electric machine rotor as recited in claim 2, wherein the conductive end engagement portion and the conductive end recess are electron beam welded.

4. The electric motor rotor as claimed in claim 1, wherein the conductive bars are uniformly distributed on the outer circumferential surface of the core, and the arc lengths between adjacent conductive bars are equal.

5. The electric machine rotor as recited in claim 1, wherein the conductive end portion further has an outer end surface, and a bottom surface of the conductive end groove is connected to the outer end surface through an outer circumferential surface of the conductive end portion.

6. An electric machine rotor as claimed in claim 5, wherein the conductive bars have an inverted triangular or trapezoidal cross-sectional shape.

7. The electric motor rotor as recited in claim 5, wherein the bottom surface of the conductive bar is a transitional arc surface and the top surface of the conductive bar is an arc surface having the same radius as the conductive end.

8. An electric machine rotor as claimed in claim 1, characterized in that the conductive end portion is in the shape of a dome or a ring.

9. An electric machine rotor as recited in claim 1, wherein the conductive end slots extend from a direction facing the core toward a direction away from the core.

10. The electric machine rotor as recited in claim 1, wherein the conductive bars and the conductive end portions are made of an oxygen free copper material.