阅读说明：本技术 转子叠片的压合结构、压合工装以及转子叠层的加工方法 (Rotor lamination pressing structure, pressing tool and rotor lamination processing method ) 是由 韩军浩 方敏 马锁学 于 2020-12-28 设计创作，主要内容包括：一种转子叠片的压合结构,叠片本体的外圆上设有一个定位凸起。一种压合工装,具有内孔的柱体,柱体的内壁开设有多条定位槽,数量与转子叠片数量一致。定位槽绕内孔顺时针或逆时针间隔分布,且与内孔的轴线平行。一种转子叠层的加工方法,将转子叠片通过定位凸起按照定位工装中的定位槽的分布顺序依次叠放在内孔中压合、脱模,然后通过电火花线切割定位凸起,最后通过磨削完成转子叠层外圆的面加工。由于在转子叠片上增加了定位凸起,并配合压合工装中的定位槽,使转子叠层在压合过程中所受到的压力竖直作用于转子叠片的表面,避免了斜槽受力,提高了转子叠层斜槽宽度的一致性和均匀性,保证了转子叠层的磁性能均匀性,从而使产品精度得到保证。(A pressing structure of a rotor lamination is characterized in that a positioning protrusion is arranged on the outer circle of a lamination body. A pressing tool is provided with a cylinder body with an inner hole, wherein the inner wall of the cylinder body is provided with a plurality of positioning grooves, and the number of the positioning grooves is consistent with that of rotor laminations. The locating grooves are distributed around the inner hole at intervals clockwise or anticlockwise and are parallel to the axis of the inner hole. A method for processing a rotor lamination includes the steps of sequentially stacking rotor laminations in inner holes through positioning protrusions according to the distribution sequence of positioning grooves in a positioning tool, pressing, demolding, cutting the positioning protrusions through electric spark wires, and finally grinding to finish surface processing of the outer circle of the rotor lamination. The positioning bulge is added on the rotor lamination and is matched with the positioning groove in the pressing tool, so that the pressure applied to the rotor lamination in the pressing process vertically acts on the surface of the rotor lamination, the stress of the chute is avoided, the width consistency and uniformity of the chute of the rotor lamination are improved, the magnetic performance uniformity of the rotor lamination is ensured, and the product precision is ensured.)

1. The utility model provides a pressfitting structure of rotor lamination which characterized in that: including annular lamination body, evenly distributed has a plurality of notches, its characterized in that on lamination body's the circumference: the lamination body is provided with a positioning bulge on the excircle, the positioning bulge is positioned at the central position between any two adjacent notches, the width of the positioning bulge is smaller than that of the excircle of the lamination body between the adjacent notches, and the thickness of the positioning bulge is consistent with that of the lamination body.

2. A rotor lamination press-fit structure according to claim 1, wherein: the positioning bulge is rectangular and is provided with a chamfer.

3. The utility model provides a pressfitting frock which characterized in that: the lamination is a cylinder with an inner hole, and the diameter of the inner hole is matched with the diameter of the lamination body to form clearance fit; a plurality of positioning grooves are formed in the inner wall of the cylinder body, and the number of the positioning grooves is consistent with the number of rotor laminations needed for forming the rotor lamination; the positioning grooves are distributed around the inner hole at intervals clockwise or anticlockwise and are parallel to the axis of the inner hole; the width of the positioning groove is matched with the width of the positioning protrusion to form clearance fit.

4. The press fitting tool according to claim 3, wherein: the corresponding minimum included angle phi between the positioning grooves is specifically determined as follows:

assuming m is the number of slots on the rotor laminations; θ angle between adjacent slots on the same rotor lamination:

θ=360°/m；

assuming that n rotor laminations are needed, the 1 st rotor lamination and the n th rotor lamination need to be different by an angle theta of one notch, and the angle alpha of the notch needed to rotate between two adjacent rotor laminations is as follows:

α=θ/(n-1)；

the included angle phi between the positioning grooves:

φ=θ+α。

5. the press fitting tool according to claim 4, wherein: the included angle between the adjacent positioning grooves can also be d theta + alpha, and d is a natural number greater than 1.

6. The press fitting tool according to claim 3, wherein: the positioning grooves are marked with serial numbers;

further, the number of the notches of the rotor lamination is 20, the number of the rotor laminations required for forming one rotor lamination is 16, 16 positioning grooves are formed in the pressing tool, and the minimum included angle between two adjacent positioning grooves is 19.2 degrees.

7. The press fitting tool according to claim 3, wherein: in the 16 positioning grooves, the included angles between the 4 th positioning groove and the 5 th positioning groove, between the 8 th positioning groove and the 9 th positioning groove, and between the 12 th positioning groove and the 13 th positioning groove are 37.2 degrees.

8. A method for processing a rotor lamination is characterized in that;

step 1, sequentially stacking the rotor laminations in an inner hole through positioning bulges according to the distribution sequence of positioning grooves in a positioning tool, and then applying a pressing force vertical to the surfaces of the rotor laminations for pressing;

step 2, demoulding the rotor lamination after press forming;

and 3, cutting the positioning bulges of the laminated outer circle of the rotor in the step 2 by a wire cut electrical discharge machining process, and finally finishing the surface machining of the laminated outer circle of the rotor by grinding.

Technical Field

The invention belongs to the technical field of sine and cosine rotary transformer processing, and relates to a rotor lamination in a transformer, a lamination pressing tool and a processing method of the rotor lamination.

Background

The rotor lamination assembly in the sine-cosine resolver is formed by laminating a plurality of rotor laminations. Each rotor lamination is provided with a plurality of notches which are uniformly distributed around the circumference of the rotor lamination. As shown in fig. 1 and 2, the laminated rotor stack 1 has a skewed slot 2, and the skewed slot 2 is formed by sequentially rotating upper and lower rotor laminations by a certain angle.

The tooling and the pressing method adopted by the existing rotor lamination during pressing are as follows:

the existing rotor lamination adopts the notch of the rotor lamination to carry out rotary positioning when in lamination. And a positioning key consistent with the angle of the chute is arranged on the corresponding tool. Taking the example that the number of the notches on the rotor lamination is 20, 16 rotor laminations are needed to form the rotor lamination. When the lamination is pressed, firstly, a notch of the upper rotor lamination and a notch of the lower rotor lamination are sequentially embedded on the positioning key to complete the rotary positioning and stacking of the rotor laminations; then placing process inlaid strips processed by copper sheets in the other chutes for auxiliary positioning; and finally, pressing. The problem that current pressfitting frock and the mode of location pressfitting exist is: when the requirement of product precision is higher, the lamination performance requirement of the rotor can not be met. The reason is that: when rotor laminations are positioned on a chute of the existing tool, because the laminations are soft, notches which are directly contacted with positioning keys can be extruded to deform, and further the structure and the magnetic performance of a rotor lamination assembly are damaged; and secondly, when pressure is applied to the rotor lamination, the lamination must rotate according to the angle of the positioning key of the tool because the positioning key has an oblique angle. The stress is very easy to be uneven, and the problems of cracking and the like are caused, which also can cause damage to the structure and the magnetic performance of the rotor laminated assembly.

Disclosure of Invention

In view of the above, the invention provides a rotor lamination, a lamination pressing tool and a rotor lamination processing method, which can effectively prevent the rotor lamination from being damaged in the positioning and pressing process, and further ensure the magnetic performance of the whole rotor lamination.

The technical scheme adopted by the invention is as follows: the utility model provides a pressfitting structure of rotor lamination, includes annular lamination body, evenly distributed has a plurality of notches on lamination body's the circumference, its characterized in that: the lamination body is provided with a positioning bulge on the excircle, the positioning bulge is positioned at the central position between any two adjacent notches, the width of the positioning bulge is smaller than that of the excircle of the lamination body between the adjacent notches, and the thickness of the positioning bulge is consistent with that of the lamination body.

Further, the positioning protrusion is rectangular and has a chamfer.

The utility model provides a pressfitting frock which characterized in that: the lamination is a cylinder with an inner hole, and the diameter of the inner hole is matched with the diameter of the lamination body to form clearance fit; a plurality of positioning grooves are formed in the inner wall of the cylinder body, and the number of the positioning grooves is consistent with the number of rotor laminations needed for forming the rotor lamination; the positioning grooves are distributed around the inner hole at intervals clockwise or anticlockwise and are parallel to the axis of the inner hole; the width of the positioning groove is matched with the width of the positioning protrusion to form clearance fit.

Further, the corresponding minimum included angle phi between the positioning grooves is specifically determined as follows:

assuming m is the number of slots on the rotor laminations; θ angle between adjacent slots on the same rotor lamination:

θ=360°/m；

assuming that n rotor laminations are needed, the 1 st rotor lamination and the n th rotor lamination need to be different by an angle theta of one notch, and the angle alpha of the notch needed to rotate between two adjacent rotor laminations is as follows:

α=θ/(n-1)；

minimum included angle between positioning grooves phi:

φ=θ+α。

furthermore, the included angle between the adjacent positioning grooves can also be d theta + alpha, and d is a natural number greater than 1.

Furthermore, the positioning grooves are marked with serial numbers;

further, the number of the notches of the rotor lamination is 20, the number of the rotor laminations required for forming one rotor lamination is 16, 16 positioning grooves are formed in the pressing tool, and the minimum included angle between two adjacent positioning grooves is 19.2 degrees.

Further, in the 16 positioning grooves, the included angle between the 4 th positioning groove and the 5 th positioning groove, between the 8 th positioning groove and the 9 th positioning groove, and between the 12 th positioning groove and the 13 th positioning groove is 37.2 degrees.

A method for processing a rotor lamination is characterized in that;

step 1, sequentially stacking the rotor laminations in an inner hole through positioning bulges according to the distribution sequence of positioning grooves in a positioning tool, and then applying a pressing force vertical to the surfaces of the rotor laminations for pressing;

step 2, demoulding the rotor lamination after press forming;

and 3, cutting the positioning bulges of the laminated outer circle of the rotor in the step 2 by a wire cut electrical discharge machining process, and finally finishing the surface machining of the laminated outer circle of the rotor by grinding.

The invention has the beneficial effects that: the positioning bulge is additionally arranged on the outer circle of the rotor lamination and is matched with the positioning groove in the pressing tool for positioning, so that the pressure of the rotor lamination in the pressing process vertically acts on the surface of the rotor lamination, the stress of the chute is avoided, the purpose of uniform stress is achieved, the width consistency and uniformity of the chute of the rotor lamination are improved, the magnetic performance uniformity of the rotor lamination is ensured, and the product precision is ensured.

Drawings

Fig. 1 is a schematic structural view of a rotor lamination.

FIG. 2 is a top view of a rotor lamination.

Fig. 3 is a schematic view of the structure of a rotor lamination.

Fig. 4 is a schematic structural view of the press-fitting tool.

Fig. 5 is a schematic view of a rotor lamination stack within a lamination tool.

FIG. 6 is a schematic view of a rotor lamination without machining the outer circle.

In the figure: 1. the rotor lamination, 2, chute, 3, rotor lamination, 4, notch, 5, location arch, 6, pressfitting frock, 7, hole, 8, constant head tank, 9, the rotor lamination of unprocessed excircle.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 3, the lamination structure of the rotor lamination 3 includes an annular lamination body, and a plurality of notches 4 are uniformly distributed on the circumference of the lamination body. A positioning bulge 5 is arranged on the outer circle of the lamination body. The positioning projection 5 is located at the center between any two adjacent notches 4. The width of the positioning protrusion 5 is smaller than the width of the outer circle of the laminated body between the adjacent notches 4. The thickness of the positioning projection 5 corresponds to the thickness of the lamination body. The positioning projection 5 is rectangular.

As shown in fig. 4, the press-fitting tool 6 is a cylinder having an inner hole 7. The bore diameter of the bore 7 is adapted to the diameter of the lamination body. The inner hole 7 is in clearance fit with the lamination. The inner wall of the column body is provided with a plurality of positioning grooves 8. The positioning slots 8 are distributed around the inner hole 7 at intervals clockwise or anticlockwise. The locating slot 8 is parallel to the axis of the inner hole 7. The number of positioning slots 8 corresponds to the number of rotor laminations 3 required to form the rotor stack 1.

According to the angle design principle of the chute 2 on the rotor lamination 1;

assuming that there are m slots 4 on a rotor lamination 3, the angle θ =360 °/m between adjacent slots 4 on the same rotor lamination 3.

Suppose that n pieces are required for the rotor lamination 3. It is necessary to make the difference between the 1 st rotor lamination 3 and the n-th rotor lamination 3 by an angle θ.

And the slots 4 between two adjacent rotor laminations 3 need to be rotated by an angle a = θ/(n-1).

The minimum angle between the two positioning grooves 8 is phi = theta + alpha.

In view of the reasonableness of the distribution of the positioning grooves 8, the included angle between two positioning grooves 8 may also be d θ + α, and d is a natural number greater than 1.

Since the positioning slots 8 need to be distributed within the range of 7360 degrees of the inner hole, the present invention is designed mainly for the rotor lamination 1 with n ≦ 20.

Taking the example that the number of the notches 4 of the rotor lamination 3 is 20, and the number of the rotor laminations 3 required for forming one rotor lamination 1 is 16:

the angle between adjacent notches 4 is 18 deg.. According to the design principle of the rotor chute 2 angle, the difference between the 1 st rotor lamination 3 and the last 1 rotor lamination 3 is 18 degrees. That is, by rotating the rotor laminations 3 15 times per 1.2 ° rotation, the desired chute 2 angle of the rotor lamination 1 is achieved.

As shown in fig. 4, 16 positioning grooves 8 arranged counterclockwise are provided on the corresponding pressing tool 6, and the rotor lamination 3 is rotated by one more notch 4 in consideration of the reasonability of the distribution of the positioning grooves 8 on the pressing tool 6. The minimum angle between two adjacent positioning slots 8 is 19.2 deg.. This ensures that the difference between the upper and lower laminates is 1.2.

In addition, as shown in fig. 3, the magnetic field is strong in the rolling direction, i.e., the radial direction, when the rotor lamination 3 is processed. In order to improve the magnetic field uniformity of the whole rotor lamination 1, the symmetry of the rotor lamination 3 in the rolling direction is comprehensively considered, so that the 16 rotor laminations 3 are uniformly distributed on the circumference in the rolling direction. Every 4 rotor laminations 3 are rotated by one more slot 4 angle over the original included angle. As shown in fig. 4, the rotor stack 1 is rotated by 37.2 ° between the 4 th and 5 th sheets, between the 8 th and 9 th sheets, and between the 12 th and 13 th sheets. Corresponding to the positioning groove 8, the included angle between the 4 th strip and the 5 th strip, between the 8 th strip and the 9 th strip and between the 12 th strip and the 13 th strip is designed to be 37.2 degrees.

As shown in fig. 5, the rotor laminations 3 are sequentially stacked in the hollow space of the pressing tool 6 through the positioning protrusions 5 according to the distribution sequence of the positioning grooves 8, and then are pressed, dried and demoulded. Finally, a rotor lamination 9 of a raw outer circle is obtained as shown in fig. 6.

For the rotor lamination 9 with the unprocessed outer circle, the positioning bulge 5 on the outer circle of the rotor lamination 1 is cut through a wire cut electrical discharge machining process, and then the surface processing of the outer circle is finished through grinding, and finally the rotor lamination 1 is formed as shown in fig. 1. Wire cut electrical discharge machining and grinding are conventional process methods.