Copper rotor for asynchronous motor

Abstract

The utility model discloses a copper rotor for an asynchronous motor, which comprises a rotor iron core, a motor shaft is inserted into the rotor iron core, the rotor iron core is formed by laminating a plurality of magnetic conductive materials, a plurality of rectangular notches are circumferentially distributed on the magnetic conductive materials, and the motor shaft is inserted into the motor shaft. The rectangular notches in the magnetic conductive material are correspondingly overlapped to form rectangular through grooves, copper conducting bars are inserted and installed in the rectangular through grooves, the two ends of each copper conducting bar are exposed out of the rectangular through grooves, a copper wedge block is clamped between any two adjacent exposed copper conducting bars, the copper wedge blocks are tightly attached to the end face of the rotor iron core, and the rectangular through grooves are formed in the end face of the rotor iron core. A copper end ring is clamped outside the copper wedge block and the exposed copper conducting bar; the copper rotor can still keep higher strength in a high-temperature environment, effectively improves the torque of the asynchronous motor, avoids copper welding, reduces the cost, and is simple to manufacture.

Description

Technical Field

[0001] The utility model relates to a motor rotor structure, in particular to a copper rotor for an asynchronous motor. Background Art

[0002] The asynchronous motor rotor structure commonly seen in life is generally composed of a rotor core, a rotor winding and a rotating shaft. Its material is a cast aluminum plus silicon steel lamination structure. Aluminum has a low melting point, and its electrical conductivity and casting performance are also good. Using this structure in mass production can save a lot of corporate costs. However, due to the low melting point of aluminum, this cast aluminum structure rotor cannot be used in certain special high-temperature environments. In addition, since the electrical conductivity of aluminum is still somewhat different from that of copper, it is not advisable to use a cast aluminum structure rotor when pursuing higher motor efficiency or torque.

[0003] In some large asynchronous motor structures, welded copper cages are used. However, due to the poor welding performance of copper, the welding quality is difficult to guarantee, which can easily lead to insufficient strength of the copper cage and high welding costs. In addition, during the cage welding process, a large amount of local heat is generated, which can easily cause structural deformation.

[0004] Patent No. 201922281201.4 discloses a new type of copper rotor for an electric motor, which includes a rotor core, a number of copper bars, two end rings and two hoops. The copper bars are inserted in the rotor core and one end and one end are reserved to be exposed outside the rotor core. The end rings are integral structural parts, which are installed at both ends of the rotor core to mesh with the head and tail of the copper bars, and the end rings and the copper bars are welded and fixed to each other. The hoops are tightly fitted on the end rings and the outer diameters of the end rings. When the end rings of the copper rotor are installed at both ends of the rotor core, they can only be inserted along the axial direction of the rotor core, and in order to fully mesh with the head and tail of the copper bars, only clearance fit can be performed, which needs to be welded and fixed. However, due to the poor welding performance of copper, the welding quality is not easy to guarantee, which increases the difficulty of installation. Utility Model Content

[0005] The technical problem to be solved by the utility model is: a copper rotor for an asynchronous motor, which can still maintain high strength in a high temperature environment, effectively improve the torque of the asynchronous motor, and at the same time avoid copper welding, reduce costs, and is simple to manufacture.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a copper rotor for an asynchronous motor, comprising a rotor core, a motor shaft is inserted and installed in the rotor core, the rotor core is made of a plurality of pieces of magnetic conductive materials, a plurality of rectangular notches are distributed circumferentially on the magnetic conductive material, the rectangular notches on the magnetic conductive material are correspondingly stacked to form a rectangular through slot, a copper conductive bar is inserted and installed in the rectangular through slot, both ends of the copper conductive bar are exposed outside the rectangular through slot, a copper wedge is clamped between any two adjacent exposed copper conductive bars, the copper wedge is tightly attached to the end face of the rotor core, and the copper wedge and the exposed copper conductive bar are clamped with copper end rings.

[0007] As a preferred solution, the rectangular through slots are distributed circumferentially on the rotor core, the cross-section of the copper conductor bar is adapted to the rectangular through slots, and the contact surface between the copper wedge block and the copper conductor bar has a slope, which is the ratio of 360 degrees to the number of rectangular through slots.

[0008] As a preferred solution, the rotor core is made of a soft material of an iron-cobalt-vanadium soft magnetic alloy with high saturation magnetic induction intensity.

[0009] As a preferred solution, a positioning step is provided at one end of the copper conductor bar, the positioning step corresponds to an end surface of one end of the rotor core, and the positioning steps are all located at the same end.

[0010] As a preferred solution, a positioning retaining ring is provided on the motor shaft corresponding to the end surface of one end of the rotor core, and an elastic retaining ring is provided at the other end of the rotor core, which is clamped on the motor shaft and close to the end surface of the other end of the rotor core.

[0011] As a preferred solution, the outer edges of the copper conductor bar and the copper wedge block are provided with inclined surfaces that match the copper end rings.

[0012] After adopting the above technical scheme, the effect of the utility model is as follows: since the copper rotor for the asynchronous motor includes a rotor core, a motor shaft is inserted and installed in the rotor core, the rotor core is made of a plurality of magnetic conductive materials, a plurality of rectangular notches are distributed on the circumference of the magnetic conductive material, and the rectangular notches on the magnetic conductive material are correspondingly superimposed to form a rectangular through slot, a copper conductive bar is inserted and installed in the rectangular through slot, and both ends of the copper conductive bar are exposed outside the rectangular through slot, a copper wedge is clamped between any two adjacent exposed copper conductive bars, the copper wedge is close to the end face of the rotor core, and the copper wedge and the exposed copper conductive bar are clamped with a copper end ring; first, the motor is The shaft is pressed into the rotor core to be effectively fixed, and then the copper bars are inserted into the rectangular through slots in turn, and then the copper wedges are inserted from the outer edge of the rotor core into the adjacent copper bars in turn, so that the copper wedges can tighten the gaps between the adjacent copper bars, and then the copper wedges are pounded tight with a leather hammer to make the copper wedges and the copper bars completely close, and then the outer edges of the copper wedges are aligned with the outer edges of the copper bars, and finally the copper end rings are clamped on the outer edges formed by the copper wedges and the copper bars; the assembly of the copper rotor does not require welding, which reduces the disadvantages of welding, reduces costs, is simple to manufacture, and can still maintain a high strength in a high temperature environment, effectively improving the torque of the asynchronous motor.

[0013] Furthermore, since the rectangular through slots are distributed circumferentially on the rotor core, the cross-section of the copper conductor bar is adapted to the rectangular through slots, and the contact surface between the copper wedge block and the copper conductor bar has an inclination, and the inclination is the ratio of an angle of 360 degrees to the number of rectangular through slots; since the cross-section of the copper conductor bar is also rectangular and is distributed circumferentially on the rotor core, the gap between the copper conductor bars will form a certain angle, so that by setting the copper wedge block to a corresponding inclination, it can cooperate with the copper conductor bar and improve the installation effect.

[0014] Furthermore, since the rotor core is made of a soft material of an iron-cobalt-vanadium soft magnetic alloy with high saturation magnetic induction intensity, it can ensure that the rotor core has good magnetic conductivity, can effectively sense and conduct the magnetic field, and maintain stable magnetic properties under different temperatures and magnetic field intensities, thereby improving reliability.

[0015] Furthermore, since a positioning step is provided at one end of the copper conductor bar, the positioning step corresponds to the end surface of one end of the rotor core, and the positioning steps are all located at the same end; thus, the copper conductor bar can be positioned quickly and accurately when being installed, thereby improving the installation accuracy.

[0016] Furthermore, since a positioning retaining ring is provided on the motor shaft corresponding to the end face of one end of the rotor core, and an elastic retaining ring is provided on the other end of the rotor core, which is clamped on the motor shaft and close to the end face of the other end of the rotor core, the installation position can be quickly and accurately located when the motor shaft is installed, and the elastic retaining ring can ensure that no axial movement occurs after installation.

[0017] Furthermore, because the outer edges of the copper guide bar and the copper wedge block are provided with inclined slopes matched with the copper end rings, the copper end rings can be guided for installation, thereby improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a stereogram of an embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0021] Figure 3 It is an end view of the copper conductor bar and the copper wedge block of the embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the copper conductor bar and the copper wedge block of the embodiment of the utility model;

[0023] Figure 5 yes Figure 2 A partial enlarged view of point A;

[0024] In the attached figure: 1, rotor core; 2, motor shaft; 3, rectangular through slot; 4, copper guide bar; 5, copper wedge; 6, copper end ring; 7, positioning step; 8, positioning retaining ring; 9, elastic retaining ring; 10, inclined slope. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below through specific embodiments.

[0026] like Figures 1 to 5 As shown, a copper rotor for an asynchronous motor comprises a rotor core 1, a motor shaft 2 is inserted and installed in the rotor core 1, the rotor core 1 is formed by stacking a plurality of magnetic conductive materials, a plurality of rectangular notches are distributed circumferentially on the magnetic conductive materials, the rectangular notches on the magnetic conductive materials are correspondingly stacked to form a rectangular through slot 3, a copper conductive bar 4 is inserted and installed in the rectangular through slot 3, both ends of the copper conductive bar 4 are exposed outside the rectangular through slot 3, a copper wedge 5 is clamped between any two adjacent exposed copper conductive bars 4, the copper wedge 5 is close to the end face of the rotor core 1, and the copper wedge 5 and the exposed copper conductive bar 4 are clamped with a copper end ring 6.

[0027] In this embodiment, the copper conductor bar 4 is made of dispersed copper material, and a layer of silver is plated on the outer surface of the copper conductor bar 4, which can improve the conductive effect, and the copper conductor bar 4 is in the shape of a long strip, and the cross section is adapted to the rectangular through slot 3. The copper conductor bar 4 can be perfectly inserted into the magnetic conductive component, and multiple copper conductor bars 4 can form a squirrel cage; the motor shaft 2 is assembled into the rotor core 1 with an interference fit to ensure a firm installation, and the copper wedge block 5 and the copper end ring 6 are also processed with dispersed copper material, and a layer of silver is also plated on the outer surface. The copper wedge block 5 is inserted into the adjacent copper conductor bars 4 from the outer edge of the rotor core 1 in turn, which can ensure that the copper wedge block 5 tightens the gap between the adjacent copper conductor bars 4, and then the copper wedge block 5 is pounded by a leather hammer to make the copper The wedge block 5 is completely in close contact with the copper conductor bar 4, and the assembly of the copper rotor does not require welding, which reduces the disadvantages brought by welding, reduces costs, is simple to manufacture, and can still maintain a high strength in a high temperature environment; after the copper wedge block 5 is clamped between the copper conductor bars 4, it is necessary to ensure that the outer edges of the copper wedge block 5 and the copper conductor bar 4 are the same size and cooperate with the copper end ring 6 clamp, so at this time the entire rotor can be placed on a lathe, and the outer edges of the exposed parts of the silver-plated copper wedge blocks 5 and the silver-plated copper conductor bars 4 on both sides are processed to a suitable size, and the copper end ring 6 is clamped on the outer edges of the copper wedge block 5 and the copper conductor bar 4. Interference fit is also adopted, and the outer diameter of the copper end ring 6 after the clamp is on the outer edge of the copper wedge block 5 and the copper conductor bar 4 cannot be larger than the outer diameter of the rotor core 1, and the clamp is firmly installed.

[0028] like Figure 3 and Figure 4 As shown, the rectangular through slots 3 are distributed circumferentially on the rotor core 1, the cross-section of the copper conductor bar 4 is adapted to the rectangular through slots 3, and the contact surface between the copper wedge block 5 and the copper conductor bar 4 has an inclination, and the inclination is the ratio of three hundred and sixty degrees to the number of rectangular through slots 3; there are twenty-two rectangular through slots 3 distributed circumferentially on the rotor core 1, so there are also twenty-two copper conductor bars 4, and there are also twenty-two copper wedge blocks 5 at one end, so the inclination of the copper wedge block 5 is the ratio of three hundred and sixty degrees to twenty-two, thereby improving the installation effect.

[0029] Furthermore, the rotor core 1 is made of a soft material of 1J22 (iron-cobalt-vanadium soft magnetic alloy with high saturation magnetic induction intensity), ensuring that the rotor core 1 has good magnetic conductivity, can effectively sense and conduct magnetic fields, and maintain stable magnetic properties under different temperatures and magnetic field intensities, thereby improving reliability.

[0030] like Figure 5 As shown, one end of the copper conductor bar 4 is provided with a positioning step 7, and the positioning step 7 corresponds to the end surface of one end of the rotor core 1, and the positioning steps 7 are all located at the same end; the copper conductor bars 4 are all inserted from one side of the rotor core 1, so that the positioning steps 7 are all on one side, and when the positioning step 7 contacts the end surface of the rotor core 1, it indicates that the copper conductor bar 4 is installed in place, thereby improving the installation efficiency and accuracy.

[0031] Furthermore, a positioning retaining ring 8 is provided on the motor shaft 2 and corresponds to the end face of one end of the rotor core 1, and an elastic retaining ring 9 is provided on the other end of the rotor core 1, which is clamped on the motor shaft 2 and close to the end face of the other end of the rotor core 1; when the motor shaft 2 is inserted into the rotor core 1, the positioning retaining ring 8 contacts the end face of the rotor core 1, indicating that the motor shaft 2 is installed in place, and then the elastic retaining ring 9 is installed at the other end of the rotor core 1 to effectively prevent the motor shaft 2 from axial movement, thereby improving the use effect.

[0032] like Figure 5 As shown, the outer edges of the copper conductor bar 4 and the copper wedge block 5 are provided with an inclined surface 10 that cooperates with the copper end ring 6; since an interference fit is adopted when clamping the copper end ring 6, the inclined surface 10 can play a good guiding assembly role and improve the installation efficiency.

[0033] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solution of the present invention, without departing from the design spirit of the present invention, should fall within the scope of protection defined in the claims of the present invention.

Claims

1. A copper rotor for an asynchronous motor, comprising a rotor core, Features: A motor shaft is inserted and installed in the rotor core, and the rotor core is formed by stacking a plurality of pieces of magnetic conductive materials. A plurality of rectangular notches are distributed circumferentially on the magnetic conductive materials, and the rectangular notches on the magnetic conductive materials are correspondingly stacked to form a rectangular through slot. A copper conductive bar is inserted and installed in the rectangular through slot, and both ends of the copper conductive bar are exposed outside the rectangular through slot. A copper wedge is clamped between any two adjacent exposed copper conductive bars, and the copper wedge is tightly attached to the end face of the rotor core. The copper wedge and the exposed copper conductive bar are clamped with copper end rings.

2. A copper rotor for an asynchronous motor as claimed in claim 1, Features: The rectangular through slots are distributed circumferentially on the rotor core, the cross-section of the copper conductor bar is adapted to the rectangular through slots, and the contact surface between the copper wedge block and the copper conductor bar has an inclination, which is the ratio of 360 degrees to the number of rectangular through slots.

3. A copper rotor for an asynchronous motor as claimed in claim 1, Features: The rotor core is made of a soft material of an iron-cobalt-vanadium soft magnetic alloy with high saturation magnetic induction intensity.

4. A copper rotor for an asynchronous motor as claimed in claim 2, Features: A positioning step is provided at one end of the copper conductor bar, and the positioning step corresponds to an end surface of one end of the rotor core, and the positioning steps are all located at the same end.

5. A copper rotor for an asynchronous motor as claimed in claim 4, Features: The motor shaft is provided with a positioning retaining ring corresponding to the end surface of one end of the rotor core, and the other end of the rotor core is provided with an elastic retaining ring clamped on the motor shaft and close to the end surface of the other end of the rotor core.

6. A copper rotor for an asynchronous motor as claimed in claim 5, Features: The outer edges of the copper conductor bar and the copper wedge block are provided with inclined slopes matched with the copper end rings.

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