CN209823616U

CN209823616U - Hollow shaft rotor structure

Info

Publication number: CN209823616U
Application number: CN201920782089.XU
Authority: CN
Inventors: 刘蕾; 王战; 李跃华
Original assignee: Hefei JEE Power System Co Ltd
Current assignee: Hefei JEE Power System Co Ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2019-12-20
Anticipated expiration: 2029-05-28

Abstract

The utility model discloses a hollow shaft rotor structure, wherein a hollow rotating shaft comprises a matching part which is convex along the radial direction, and a first matching plane which is arranged along the tangential direction of the matching part is arranged on the matching part; a raised welding boss is arranged on the rotary surface of the matching part; the distance between the two welding bosses is less than 1/4 of the total length of the hollow rotating shaft; the rotor bracket comprises a middle shaft hole which is matched with the hollow rotating shaft; a second matching plane matched with the first matching plane is arranged on the revolution surface of the middle shaft hole; the center shaft hole is respectively welded and fixed with the two welding bosses, and a weight removing area is formed in a closed area between the two welding bosses and the center shaft hole; a rotor iron core is coaxially sleeved outside the rotor bracket; two ends of the rotor core are packaged with pressing plates; riveting rings are packaged at two ends of the rotor bracket; and the riveting ring is riveted and fixed with the pressing plate. The rotor support and the hollow rotating shaft are welded through friction welding or argon arc welding, the connection strength between the rotor support and the hollow rotating shaft is improved, and the overall rigidity of the rotor is improved.

Description

Hollow shaft rotor structure

Technical Field

The utility model relates to a PMSM technical field, especially a hollow shaft rotor structure.

Background

The permanent magnet synchronous motor rotor core provides a path of a magnetic field loop, and the output characteristic of the motor is influenced. However, the size of the actual effective part of the rotor core is basically only in the annular area where the magnetic steel is located, if the rotor core is directly assembled on the rotating shaft, the diameter of a rotating shaft blank material is too large, and great processing waste can be caused. But the iron core raw and other materials cost is higher, and the utilization ratio of rotor core is improved to the purpose of this design, utilizes rotor support both to do the switching support, can do the destemming again.

For example, chinese patent CN 105048669 a discloses a method of mounting a rotor support on a rotating shaft and securing it axially by means of a shrink-ring, which, although effective in mounting the rotor support, requires secondary machining by other de-weighting means. For example, in chinese patent CN 204231048U, the rotor support and the rotor punching sheet are in interference fit, and the punching sheet and the rotor support can be tightly fixed together without being pressed by a pressing plate; the magnetic steel and the punching sheet are in interference fit, and injection molding glue is poured into a gap between the magnetic steel and the punching sheet to fix the magnetic steel without a baffle to shield the end part of the magnetic steel. The disadvantage of this method is that the structure weight is difficult to control, and because the fixed mode of towards piece and support leads to being difficult to realize removing the heavy.

Therefore, in summary, the main problems of the existing solutions are:

1. the rotor core is directly matched with the shaft, corresponding weight removal is carried out on the rotor core, but the rotor core is a stamped sheet, and the shape of each sheet is consistent, so that the rotor cannot effectively remove the weight.

2. The rotor support is fixed in the pivot and is fixed through the shrink-ring, has promoted the processing degree of difficulty of pivot, and has the risk of interference inefficacy to lead to deciding the rotor axial dislocation.

3. The axial positioning of rotor support and pivot can't be guaranteed, or square keyway processing has promoted rotor manufacturing cost inside rotor support and in the pivot.

Disclosure of Invention

The utility model discloses the purpose is: the utility model provides a hollow shaft rotor structure, the binding structure is got rid of the heavy and is supported, has solved the axial positioning connection problem and the connection fixed problem of hollow shaft rotor.

The technical scheme of the utility model is that: a hollow shaft rotor structure comprises a rotor bracket, a hollow rotating shaft and a rotor iron core. Based on the hollow rotating shaft, the rotor support is coaxially sleeved on the hollow rotating shaft, and the rotor iron core is coaxially sleeved on the rotor support, so that the basic structure of the rotor is realized.

The hollow rotating shaft comprises a matching part protruding along the radial direction, namely the hollow rotating shaft is in a step shape, the matching part is a protruding stepped shaft section, a first matching plane arranged along the tangential direction of the matching part is arranged on the matching part, the first matching plane is an axial tangent plane, and the width range of the first matching plane is 2mm ~ 4mm so as to meet the matching requirement.

And 2 circles of raised welding bosses are further arranged on the rotating surface of the matching part and are used for welding and fixing with the rotor support. Therefore, the size of the welding boss only needs to meet the welding requirement, and is generally about 2 mm.

On the premise of ensuring the connection strength and the purpose of structure weight reduction, the distance between the two welding bosses is smaller than 1/4 of the total length of the hollow rotating shaft; the rotor bracket comprises a middle shaft hole which is matched with the hollow rotating shaft; a second matching plane matched with the first matching plane is arranged on the revolution surface of the middle shaft hole; the center shaft hole is respectively welded and fixed with the two welding bosses, and a weight removing area is formed in a closed area between the two welding bosses and the center shaft hole; a rotor iron core is coaxially sleeved outside the rotor bracket; two ends of the rotor core are packaged with pressing plates; riveting rings are packaged at two ends of the rotor bracket; and the riveting ring is riveted and fixed with the pressing plate.

Preferably, an end surface of the fitting portion corresponds to an end surface of the rotor holder.

Preferably, the middle shaft hole is a step-shaped shaft hole; the hole diameters of the two ends of the middle shaft hole are larger than the hole diameter of the central part of the middle shaft hole; the end surfaces of two sides of the central part are welded and fixed with the corresponding welding bosses.

Preferably, the first fitting planes are provided in two, and the two first fitting planes are symmetrical two planes.

The utility model has the advantages that:

1. the rotor support and the hollow rotating shaft are welded through friction welding or argon arc welding, so that the connection strength between the rotor support and the hollow rotating shaft can be improved, and the overall rigidity of the rotor is improved.

2. The rotor support and the hollow rotating shaft are fixed through the D-shaped keys, so that the processing difficulty of parts can be reduced.

3. The distance between the welding points on the two sides of the rotor support is not more than 1/4 of the rotating shaft assembly, and the counterweight hole is processed between the welding points, so that the counterweight effect of the rotor support can be maximized.

Drawings

The invention will be further described with reference to the following drawings and examples:

FIG. 1 is a schematic illustration of a hollow shaft rotor deduplication architecture;

FIG. 2 is a structural view of a hollow rotary shaft;

FIG. 3 is a block diagram of a rotor spider;

wherein: 1. a rotor right pressing plate; 2. a rotor support; 3. a hollow rotating shaft; 4. riveting a pressing ring; 5. a rotor core; 6. a rotor left pressure plate; 7. welding a boss; 8. a first mating plane; 9. a second mating flat surface.

Detailed Description

The utility model discloses a preferred embodiment:

a hollow shaft rotor structure comprises a rotor support 2 and a hollow rotating shaft 3, wherein the hollow rotating shaft 3 is used as a basis, the rotor support 2 is coaxially sleeved on the hollow rotating shaft 3, and a rotor core 5 is coaxially sleeved on the rotor support 2 to realize the basic structure of a rotor.

The hollow rotating shaft 3 comprises a matching part protruding along the radial direction, namely the hollow rotating shaft 3 is in a step shape, the matching part is a protruding stepped shaft section, the matching part is provided with a first matching plane 8 arranged along the tangential direction of the matching part, the first matching plane 8 is an axial tangent plane, and the width range of the first matching plane is 2mm ~ 4mm so as to meet the matching requirement.

And 2 circles of raised welding bosses 7 are further arranged on the rotating surface of the matching part, and the welding bosses 7 are used for welding and fixing with the rotor bracket 2. Therefore, the size of the welding boss 7 only needs to meet the welding requirement, and is generally about 2 mm.

In order to avoid the structure being overweight, the distance between the two welding bosses 7 is less than 1/4 of the total length of the hollow rotating shaft. The rotor bracket 2 comprises a middle shaft hole which is matched with the hollow rotating shaft 3, and a second matching plane 9 matched with the first matching plane 8 is arranged on the revolution surface of the middle shaft hole.

The middle shaft hole is a step-shaped shaft hole; the hole diameters of the two ends of the middle shaft hole are larger than the hole diameter of the central part of the middle shaft hole; the end surfaces of the two sides of the central part are welded and fixed with the corresponding welding bosses 7, so that a weight removing area is formed in a closed area between the two welding bosses 7 and the middle shaft hole.

And a rotor core 5 is coaxially sleeved outside the rotor support 2, pressing plates are packaged at two ends of the rotor core 5, and riveting pressing rings 4 are packaged at two ends of the rotor support. Because, the end surface of the fitting part corresponds to the end surface of the rotor holder 2; therefore, the caulking ring 4 can be fitted to the end face of the fitting portion at the same time when caulking and fixing the pressing plate.

Based on above-mentioned structure, as figure 1, including rotor left clamp plate 6, rotor core 5, spider 2, rotor right clamp plate 1, hollow shaft 3, riveting circle 4, spider is used for connecting rotor core and hollow shaft.

As shown in fig. 2 and 3, the hollow shaft and the rotor support are circumferentially positioned through two D-shaped keys, then welded along the arc surface of the welding boss by friction welding or argon arc welding, and then finish machining is performed on the relevant size matched with the rotor core after welding is completed.

To sum up, the utility model relates to a hollow shaft rotor structure's advantage lies in:

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical concepts of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a hollow shaft rotor structure, includes spider and hollow rotating shaft, its characterized in that: the hollow rotating shaft comprises a matching part which is protruded along the radial direction, and a first matching plane which is arranged along the tangential direction of the matching part is arranged on the matching part; a raised welding boss is arranged on the rotary surface of the matching part; the distance between the two welding bosses is less than 1/4 of the total length of the hollow rotating shaft; the rotor bracket comprises a middle shaft hole which is matched with the hollow rotating shaft; a second matching plane matched with the first matching plane is arranged on the revolution surface of the middle shaft hole; the center shaft hole is respectively welded and fixed with the two welding bosses, and a weight removing area is formed in a closed area between the two welding bosses and the center shaft hole; a rotor iron core is coaxially sleeved outside the rotor support; two ends of the rotor iron core are packaged with pressing plates; riveting rings are packaged at two ends of the rotor bracket; and the riveting pressing ring is riveted and fixed with the pressing plate.

2. A hollow shaft rotor structure according to claim 1, wherein: the end face of the matching part corresponds to the end face of the rotor support.

3. A hollow shaft rotor structure according to claim 1, wherein: the middle shaft hole is a step-shaped shaft hole; the hole diameters of the two ends of the middle shaft hole are larger than the hole diameter of the central part of the middle shaft hole; and the end surfaces of two sides of the central part are welded and fixed with the corresponding welding bosses.

4. A hollow shaft rotor structure according to claim 1, wherein: the first matching planes are two and are symmetrical.