阅读说明：本技术 一种新型结构的电机铜转子及其加工工艺 (Motor copper rotor with novel structure and machining process thereof ) 是由 骆淼 方威 熊伟 张志宪 陈乾来 于 2019-12-18 设计创作，主要内容包括：本发明公开了一种新型结构的电机铜转子,包括一个转子铁芯、若干数量的铜条、两个端环和两个抱箍,所述铜条插设在转子铁芯内并预留一头一尾外露于转子铁芯,所述端环为整体结构件,其安装在转子铁芯的两端与铜条的头尾相啮合,且端环与铜条之间相互焊接固定,所述抱箍套箍在端环上与端环外径紧密贴合；其加工工艺为：步骤1：将铜条及端环与转子铁芯进行装配；步骤2：采用搅拌摩擦焊将铜条与端环焊接固定；步骤3：机加工端环的端面、外径至设计尺寸；步骤4：热套抱箍,即成。本发明电机铜转子的结构简单,方便进行装配,而且该电机铜转子在加工时采用搅拌摩擦焊焊接端环与铜条,熔池深度大,具有更低的电阻率,焊接可靠性高。(The invention discloses a motor copper rotor with a novel structure, which comprises a rotor iron core, a plurality of copper bars, two end rings and two hoops, wherein the copper bars are inserted into the rotor iron core and are reserved with a head and a tail to be exposed out of the rotor iron core; the processing technology comprises the following steps: step 1: assembling the copper bars and the end rings with the rotor iron core; step 2: welding and fixing the copper bar and the end ring by adopting friction stir welding; and step 3: machining the end face and the outer diameter of the end ring to the designed size; and 4, step 4: and (5) hot sleeving the hoop to obtain the finished product. The motor copper rotor has a simple structure, is convenient to assemble, adopts friction stir welding to weld the end ring and the copper bar during processing, has large depth of a molten pool, lower resistivity and high welding reliability.)

1. The utility model provides a motor copper rotor of novel structure which characterized in that: the rotor core comprises a rotor core, a plurality of copper bars, two end rings and two anchor ears, wherein the copper bars are inserted into the rotor core, a head is reserved and a tail is reserved and exposed out of the rotor core, the end rings are integral structural members, the end rings are arranged at two ends of the rotor core and meshed with the head and the tail of the copper bars, the end rings and the copper bars are welded and fixed with each other, and the anchor ears are sleeved on the end rings and tightly attached to the outer diameter of the end rings.

2. A process for machining a copper rotor for an electric machine according to claim 1, characterized in that: the method comprises the following processing steps:

step 1: assembling the copper bars and the end rings with the rotor iron core;

step 2: welding and fixing the copper bar and the end ring by adopting friction stir welding;

and step 3: machining the end face and the outer diameter of the end ring to the designed size;

and 4, step 4: and (5) hot sleeving the hoop to obtain the finished product.

3. The machining process of the motor copper rotor as claimed in claim 2, wherein the machining process comprises the following steps: the assembly process of the step 1 is as follows: and fixing the rotor core by adopting a positioning fixture, then inserting the copper bars into the rotor core one by using a manipulator, exposing the head and tail ends of the copper bars out of the rotor core, and after the copper bars are assembled, installing end rings at the two ends of the rotor core to be meshed with the copper bars.

4. The machining process of the motor copper rotor as claimed in claim 2, wherein the machining process comprises the following steps: and when the step 2 adopts friction stir welding for welding, controlling the rotating speed of the welding head to be 400-600RPM, the walking speed to be 0.5-2m/min, the welding width to be 6-12mm and the welding depth to be more than or equal to 5 mm.

5. The machining process of the motor copper rotor as claimed in claim 2, wherein the machining process comprises the following steps: and 3, turning the outer diameter and the end face of the end ring by adopting a CNC (computerized numerical control) machine tool or a numerical control lathe, and processing according to conventional turning parameters.

6. The machining process of the motor copper rotor as claimed in claim 2, wherein the machining process comprises the following steps: the hot-sleeving hoop operation of the step 4 is as follows: and heating the hoop to 200 ℃ by adopting a high-frequency heating mode, sleeving the hoop into the outer diameter of the end ring, cooling the hoop, and then contracting and tightening the end ring.

Technical Field

The invention relates to the technical field of motor rotors, in particular to a motor copper rotor with a novel structure and a processing technology thereof.

Background

At present, the copper rotor of an induction motor in the industry is mostly in a structure form of a copper bar and an end ring, and the end ring is usually a conventional layered and sectional type spliced end ring, so that the assembly difficulty and the assembly time are increased during assembly; in addition, the copper bar and the end ring are mainly welded by brazing or laser welding, or are cast into a whole, but the above processing methods have some defects: the brazing efficiency is low, and the risk of insufficient soldering is large; the depth of a laser welding molten pool is low, and the cost is high; the casting process difficulty is high, the defects of internal casting incompetence and air holes are difficult to find, the quality risk is high, the cast copper temperature is high, certain damage can be caused to an insulating coating on the surface of a silicon steel sheet, and the performance of a motor is affected.

Disclosure of Invention

The invention aims to provide the motor copper rotor with a novel structure and the processing technology thereof aiming at the defects of the prior art, the motor copper rotor has the advantages of simple structure, convenience in assembly and high reliability, and the processing technology of the motor copper rotor is simple and is easy to operate.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a motor copper rotor of novel structure, includes a rotor core, the copper bar of a plurality of quantity, two end links and two staple bolts, the copper bar is inserted and is established in the rotor core and reserve a head and a tail and expose in rotor core, the end link is overall structure spare, and it meshes mutually at the both ends of rotor core and the head and the tail of copper bar, and welded fastening each other between end link and the copper bar, the staple bolt cuff closely laminates with the end link external diameter on the end link.

Further, the invention also provides a processing technology of the motor copper rotor with the novel structure, which comprises the following processing steps:

step 1: assembling the copper bar, the end ring and the rotor core, wherein the assembling process comprises the following steps: fixing the rotor core by adopting a positioning fixture, then inserting copper bars into the rotor core one by using a manipulator, exposing the head and tail ends of the copper bars out of the rotor core, and after the copper bars are assembled, installing end rings at the two ends of the rotor core to be meshed with the copper bars;

step 2: and (3) welding and fixing the copper bar and the end ring by adopting friction stir welding: controlling the rotating speed of the welding head to 400-600RPM during welding, the walking speed to 0.5-2m/min, the welding width to 6-12mm and the welding depth to be more than or equal to 5 mm;

and step 3: machining the end face and the outer diameter of the end ring to the designed size: turning the outer diameter and the end face of the end ring by adopting a CNC or a numerically controlled lathe, and processing according to conventional turning parameters;

and 4, step 4: and (3) hot covering of the hoop: and heating the hoop to 200 ℃ by adopting a high-frequency heating mode, sleeving the hoop into the outer diameter of the end ring, cooling the hoop, and then contracting and tightening the end ring.

The motor copper rotor has a simple structure, is convenient to assemble, adopts friction stir welding to weld the end ring and the copper bar together during processing, has large depth of a molten pool, better grain compactness than a base metal, lower resistivity, high welding reliability, no false welding condition of cold welding, and strength superior to that of laser welding; in addition, after the end ring is welded by friction stir welding, the welding area can reach 80 percent, which is close to cast copper, so that the end ring and the copper bar have better conductivity.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a flow chart of the process of the present invention.

In the figure: 1-a rotor core; 2-copper bar; 3-an end ring; 4-anchor ear.

Detailed Description

The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.

As shown in fig. 1, the motor copper rotor with a novel structure provided by the invention comprises a rotor core 1, a plurality of copper bars 2, two end rings 3 and two hoops 4, wherein the copper bars 2 are inserted into the rotor core 1 and are exposed out of the rotor core 1 from the head to the tail, the end rings 3 are integral structural members and are arranged at two ends of the rotor core 1 to be meshed with the head and the tail of the copper bars 2, the end rings 3 and the copper bars 2 are welded and fixed with each other, and the hoops 4 are sleeved on the end rings 3 and tightly fit with the outer diameter of the end rings 3.

In the structure of the motor copper rotor, the end ring 3 is extruded by an extrusion die and is formed at one time, and the end ring is an integral structural member, is not a conventional layered and block-type structure, is convenient to assemble and has higher assembly efficiency; in addition, the end ring 3 is extruded and molded by adopting an extrusion die, only thickness cutting is needed, and the method is suitable for design of series products and has lower cost.

FIG. 2 is a process flow of the motor copper rotor of the present invention, which comprises the following processing steps:

step 1: assembling the copper bar 2 and the end ring 3 with the rotor core 1, wherein the assembling process is as follows: fixing the rotor core 1 by using a positioning fixture, then inserting the copper bars 2 into the rotor core 1 one by using a manipulator, exposing the head and tail ends of the copper bars 2 out of the rotor core 1, and after the copper bars 2 are assembled, installing end rings 3 at two ends of the rotor core 1 to be meshed with the copper bars 2;

step 2: and (3) welding and fixing the copper bar 2 and the end ring 3 by adopting friction stir welding: controlling the rotating speed of the welding head to 400-600RPM during welding, the walking speed to 0.5-2m/min, the welding width to 6-12mm and the welding depth to be more than or equal to 5 mm;

and step 3: machining the end face, the outer diameter to the design size of the end ring 3: turning the outer diameter and the end face of the end ring 3 by adopting a CNC (computerized numerical control) machine tool, and processing according to conventional turning parameters;

and 4, step 4: and (4) hot covering of the hoop 4: and heating the hoop 4 to 200 ℃ by adopting a high-frequency heating mode, then thermally sleeving the hoop 4 into the outer diameter of the end ring 3, cooling the hoop 4, and then contracting and hooping the end ring 3 to obtain the composite material.

The motor copper rotor has the advantages that the processing technology is simple, the operation is easy, the end ring 3 and the copper bar 2 are welded together by friction stir welding, the depth of a molten pool is large, the grain compactness is better than that of a base metal, the resistivity is lower, the welding reliability is high, the false welding condition of the cold welding cannot occur, and the strength is superior to that of laser welding; in addition, after the end ring 3 is welded by friction stir welding, the welding area can reach 80 percent, which is close to cast copper, so that the end ring 3 and the copper bar 2 have better conductivity.