Motor rotor

Abstract

The utility model provides a motor rotor, and belongs to the technical field of motors. The rotor comprises a cylindrical rotor core, end rings are arranged at the two ends of the rotor core, the rotor core is formed by overlapping a plurality of rotor punching sheets with the same structure, conductive strips are inserted in the rotor punching sheets in the circumferential direction, and the two ends of the conductive strips extend out of the upper ends and the lower ends of the rotor punching sheets. The two end rings are arranged at the upper ends and the lower ends of the rotor punching sheets in a casting mode, the conductive strips extending out of the upper ends and the lower ends of the rotor punching sheets are inserted into the end rings, and the surfaces of the conductive strips are provided with plating layers. The plating layer is arranged on the conductive strip, so that the problem of oxidation heat release reaction generated when the conductive strip is in contact with the end rings made of different materials is effectively solved, and long-acting use is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, in particular to a motor rotor. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction, and includes a stator and a rotor. At present, cast copper rotors are usually used. Copper is cast in the guide grooves formed by the stacking of rotor punching sheets, which can reduce current loop losses and improve motor efficiency. However, there are some shortcomings such as poor process stability, easy generation of bubbles, etc., which affect motor performance, and high production costs.

[0003] Chinese patent CN202076903U discloses a motor rotor, which is connected to the copper bars by die-casting or riveting at both ends of the two end rings. It has little impact on the rotor punching, the rotor is not easy to overheat, and the process is relatively simple. However, the connection between the aluminum two end rings and the copper bars is prone to ionization oxidation reaction. Over time, the resistance of the contact part increases, heat is generated, and even combustion may occur. Summary of the invention

[0004] The utility model aims to provide a motor rotor, which is provided with a metal coating on the surface in contact with the end ring, thereby reducing ionization oxidation reaction, reducing heat generation and thus extending the service life.

[0005] The purpose of the utility model is achieved in this way:

[0006] A motor rotor comprises a rotor core in the shape of a ring cylinder, end rings are arranged at both ends of the rotor core, the rotor core is formed by stacking a number of rotor punchings with the same structure, conductive bars are inserted circumferentially on the plurality of rotor punchings, both ends of the conductive bars extend out of the upper and lower ends of the plurality of rotor punchings, the two end rings are arranged at the upper and lower ends of the plurality of rotor punchings in a casting manner, and the conductive bars extending out of the upper and lower ends of the plurality of rotor punchings are inserted into the end rings, and the surface of the conductive bars is provided with a coating.

[0007] The utility model is further configured such that limiting holes are provided at both ends of the conductive bar. When the end rings are covered on both ends of a number of rotor punchings by casting, the ends of the end rings form mounting grooves for mounting the ends of the conductive bar, and limiting columns for filling the limiting holes are formed in the mounting grooves.

[0008] The utility model is further configured that the surface of the rotor punching sheet is provided with a coating which is the same as the surface of the conductive bar, the material of the rotor punching sheet is iron, the material of the conductive bar is copper, and the material of the end ring is aluminum.

[0009] The utility model is further configured that the coating is a metal coating.

[0010] The utility model is further configured that resin or glue is arranged between the conductive strip and a plurality of rotor punching sheets.

[0011] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0012] The motor rotor provided by the utility model adopts metal plating on the ends of the copper rotor punching sheets and the conductive strips, so that a smaller potential difference is generated when electrically contacting with the end rings of different materials, reducing the oxides produced by the ionization oxidation reaction, so that the resistance of the contact part is not easy to increase, thereby reducing heat generation and ensuring the service life of the motor rotor; the resin or glue arranged between the rotor punching sheets and the conductive strips provides effective shock-proof and noise-reducing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the conductive strip of the utility model;

[0015] Figure 3 It is an explosion schematic diagram of the utility model;

[0016] Reference numerals:

[0017] 1- rotor core; 10- rotor punching sheet; 11- conductive bar; 12- coating; 13- limiting hole;

[0018] 2-end ring; 20-installation groove; 21-limiting column. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings. Figures 1 to 3 :

[0020] A motor rotor comprises a rotor core 1 in the form of a ring cylinder, end rings 2 are arranged at both ends of the rotor core 1, and the rotor core 1 is formed by stacking a number of rotor punchings 10 with the same structure, characterized in that a conductive bar 11 is inserted circumferentially on the plurality of rotor punchings 10, and both ends of the conductive bar 11 extend out of the upper and lower ends of the plurality of rotor punchings 10, and the two end rings 2 are both arranged on the upper and lower ends of the plurality of rotor punchings 10 in a casting manner, and the conductive bars 11 extending out of the upper and lower ends of the plurality of rotor punchings 10 are inserted into the end rings, and the surface of the conductive bar 11 is provided with a coating 12.

[0021] During the implementation, a plurality of stacked rotor sheets 10 will form holes for installing a plurality of conductive bars 11. After the plurality of conductive bars are installed, both ends of all conductive bars will extend out of the upper and lower ends of the plurality of rotor sheets 10. The extended portion is cast to form an end ring, which will wrap the extended portion to form a motor rotor assembly.

[0022] In the above structure, a coating is provided on the surface of the conductive strip 11, which can reduce the resistance generated by the oxide, reduce the heat generation, and ensure long-term use.

[0023] Preferably, both ends of the conductive bar 11 are provided with limiting holes 13, and when the end ring 2 is covered on both ends of a plurality of rotor sheets 10 by casting, the end of the end ring 2 forms a mounting groove 20 for mounting the end of the conductive bar 11, and a limiting column 21 for filling the limiting hole 13 is formed in the mounting groove 20. The formed limiting hole 13 can play a fixing effect during the casting process to prevent the end ring from falling off from both ends of the rotor sheet.

[0024] Preferably, the surface of the rotor punching sheet 10 is provided with a coating that is the same as the surface of the conductive bar 11 , the rotor punching sheet 10 is made of iron, the conductive bar 11 is made of copper, and the end ring 2 is made of aluminum.

[0025] Preferably, the coating 12 is a metal coating. The metal coating can be composed of different metal materials, and its main purpose is to reduce the potential difference and reduce the oxides generated after the ionization oxidation reaction.

[0026] Preferably, resin or glue is provided between the conductive bar 11 and the rotor sheets 10 to reduce noise and vibration.

[0027] A coating 12 is provided on the surface of the conductive strip 11 and the rotor punching sheet 10 to reduce the potential difference when the copper conductive strip and the conductive strip are in contact with the aluminum end ring 2 of different material, thereby reducing the ionization oxidation reaction generated during contact, making it difficult to increase the resistance caused by the oxide, reducing heat generation, and ensuring the service life of the motor rotor.

[0028] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor rotor, comprising a rotor core (1) in the form of a ring cylinder, end rings (2) being arranged at both ends of the rotor core (1), the rotor core (1) being formed by stacking a plurality of rotor punchings (10) of the same structure, characterized in that: Conductive bars (11) are circumferentially inserted on a plurality of rotor sheets (10), and two ends of the conductive bars (11) extend out of the upper and lower ends of the plurality of rotor sheets (10). The two end rings (2) are both disposed on the upper and lower ends of the plurality of rotor sheets (10) in a casting manner, and the conductive bars (11) extending out of the upper and lower ends of the plurality of rotor sheets (10) are inserted into the end rings, and a coating (12) is disposed on the surface of the conductive bars (11).

2. A motor rotor according to claim 1, characterized in that: Both ends of the conductive bar (11) are provided with limiting holes (13); when the end ring (2) is covered on both ends of a plurality of rotor punching sheets (10) by casting, the end of the end ring (2) forms a mounting groove (20) for mounting the end of the conductive bar (11); and a limiting column (21) is formed in the mounting groove (20) to fill the limiting hole (13).

3. The motor rotor according to claim 1, characterized in that: The surface of the rotor punching sheet (10) is provided with a coating which is the same as the surface of the conductive strip (11); the material of the rotor punching sheet (10) is iron, the material of the conductive strip (11) is copper, and the material of the end ring (2) is aluminum.

4. The motor rotor according to claim 1, characterized in that: The coating (12) is a metal coating.

5. The motor rotor according to claim 1, characterized in that: Resin or glue is provided between the conductive bar (11) and the plurality of rotor punching sheets (10).

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