CN215009800U - Rotor of permanent magnet motor - Google Patents

Abstract

The utility model relates to a rotor of a permanent magnet motor, which comprises a rotating shaft, a rotor bracket and a rotor iron core which are connected in sequence from inside to outside; the rotor bracket comprises at least two brackets which are coaxially arranged; a shaft hole is formed in the rotor bracket, the shaft hole is fixedly assembled with the rotating shaft, and the rotor bracket is sleeved on the rotating shaft; and the outer side of the rotor bracket is fixedly assembled with the rotor core. The utility model discloses a split type structure's spider, with longer spider split into two or more short supports, and the short support of processing is then very easy to current processing condition. Therefore the utility model discloses reduce the processing degree of difficulty, neither need use various main equipment, also need not large-scale workshop, can also guarantee shorter processing cycle and higher material utilization. The utility model discloses can practice thrift the cost for the enterprise, solve the problem that current processing condition can't satisfy high-power permanent-magnet machine's rotor processing.

Description

Rotor of permanent magnet motor

Technical Field

The utility model relates to a permanent-magnet machine technical field generally. More specifically, the present invention relates to a rotor for a permanent magnet motor.

Background

The permanent magnet motor is a permanent magnet synchronous motor, adopts permanent magnets for excitation, and structurally comprises a stator, a rotor, an end cover and the like. The stator includes a winding and a stator core. The rotor comprises a rotor bracket, a rotor iron core, a permanent magnet, and auxiliary parts such as a positioning rib, a pull rod, an end plate, a pressing ring and the like.

A rotor support for bearing rotor core needs to pass through the key-type connection with the pivot, consequently, in permanent magnet motor's production and processing process, need process the keyway on pivot and rotor support. For the rotating shaft, the processing technology of the key slot is very simple and mature, and the operation is easy. For the rotor support, because the key groove of the rotor support is positioned in the rotor support, the rotor support cannot be processed by equipment such as a processing center, and a processing mode of linear cutting is needed.

The existing production conditions can meet the processing requirements of medium and small power permanent magnet motors. However, difficulties are encountered with high power permanent magnet machines, including: first, the rotor core of a high-power permanent magnet motor is longer, and accordingly, the length of the rotor support in the axial direction is also longer. Compared with the rotor support with shorter length, the rotor support with longer length needs longer auxiliary connecting pieces, so the required processing equipment is more complicated, and the processing period of the whole rotor support is longer. Secondly, the length of the key groove on the rotor support is also long, and common linear cutting equipment cannot process the key groove and only large linear cutting equipment can be used. Thirdly, as the rotor core and the rotor support are longer, the length of the positioning ribs between the rotor core and the rotor support needs to be lengthened, which affects the utilization rate of materials and also limits the size of blanks and processing equipment. Fourthly, during hot-sleeving machining, the rotating shaft penetrates through the shaft hole of the rotor support, and the operating space (height) of a workshop is required to at least reach the sum of the lengths of the rotating shaft and the rotor support due to the fact that the rotating shaft and the rotor support are long.

In conclusion, the existing equipment conditions, material conditions, process conditions, workshop space and other conditions are difficult to meet the processing requirements of the high-power permanent magnet motor. If the high-power permanent magnet motor is to be processed, large-scale equipment needs to be introduced, the processing period needs to be increased, and a workshop needs to be expanded, so that the processing cost is increased sharply.

SUMMERY OF THE UTILITY MODEL

The utility model provides a permanent-magnet machine's rotor to the current processing condition of solution can't satisfy the problem of high-power permanent-magnet machine's rotor processing.

In order to solve the problems, the utility model provides a rotor of a permanent magnet motor, which comprises a rotating shaft, a rotor bracket and a rotor iron core which are connected in sequence from inside to outside; the rotor support comprises at least two supports which are coaxially arranged; a shaft hole is formed in the rotor support, the shaft hole is fixedly assembled with the rotating shaft, and the rotor support is sleeved on the rotating shaft; and the outer side of the rotor bracket is fixedly assembled with the rotor core.

In one embodiment, each of the brackets includes an inner cylinder and an outer cylinder, the shaft hole is formed by communicating the interiors of the two or more inner cylinders, and the outer side of the rotor bracket is formed by the outer peripheral surfaces of the two or more outer cylinders.

In one embodiment, the support further comprises a support plate between the inner and outer cylinders, the support plate comprising an annular plate and a rib plate; the annular plate is sleeved on the inner cylinder; the rib plates are uniformly arranged in the circumferential direction and extend along the axial direction.

In one embodiment, a connecting key is arranged between the inner cylinder and the rotating shaft, and key grooves are correspondingly arranged on the inner cylinder and the rotating shaft; the connecting key is used for connecting the inner barrel and the rotating shaft.

In one embodiment, a plurality of positioning ribs are arranged between the outer side of the rotor support and the rotor core, and the positioning ribs extend along the axial direction and are uniformly distributed in the circumferential direction.

In one embodiment, each positioning rib is formed by two ribs with different lengths, and the ribs of two adjacent positioning ribs are arranged in a staggered manner.

In one embodiment, the cross-section of the positioning rib is dove-tail; the positioning rib is provided with a plurality of threaded holes perpendicular to the extending mode, the outer side of the rotor support is provided with mounting holes corresponding to the threaded holes, and the mounting holes and the threaded holes are used for penetrating bolts to fixedly connect the rotor support and the rotor core.

In one embodiment, the rotor core is provided with a positioning groove assembled with the positioning rib.

In one embodiment, the rotor core is formed by stacking a plurality of rotor punching sheets, each rotor punching sheet has the same size, each rotor punching sheet is provided with an insertion hole, and the positioning groove is formed by the plurality of insertion holes which are communicated with each other.

In one embodiment, the rotor core is further provided with permanent magnets.

The utility model discloses the thinking definite form of prior art has been abandoned: the large-power permanent magnet motor must correspondingly increase the size of the related structure of the rotor, and adopts the concept of a split-type structure rotor bracket instead, namely, a plurality of small rotor supports are connected in series to form a rotor support with longer length, thereby greatly reduced the processing degree of difficulty, neither need use various main equipment (including the large-scale line cutting equipment in order to carry out the interior keyway processing of spider, and the main equipment such as car, mill, the brill of processing spider and auxiliary member), nor need large-scale workshop (need not great space and realize the hot jacket of spider and pivot), can also guarantee shorter processing cycle (spider and various auxiliary member length are short, easy processing) and higher material utilization (various part length are short, can save and forge the blank, and can use the blank processing that accords with the standard). Therefore, to permanent-magnet machine's production and processing enterprise, the technical scheme of the utility model the difficult problem of high-power permanent-magnet machine processing has been solved on greatly reduced cost's basis.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic structural view of a permanent magnet motor rotor according to the prior art;

fig. 2 is a schematic structural diagram of a permanent magnet motor rotor according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

fig. 4 is a schematic structural view of a rotor support according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view C-C of FIG. 4;

fig. 6 is a schematic structural diagram of a positioning rib according to an embodiment of the present invention; and

fig. 7 is a cross-sectional view of a positioning rib according to an embodiment of the present invention.

Detailed Description

Fig. 1 shows a rotor 10 of a permanent magnet motor, which includes a rotor support 4, the rotor support 4 is sleeved on a rotating shaft 1, a rotor core 2 is connected to the outer side of the rotor support 4, and a permanent magnet 3 is connected to the outer side of the rotor core 2, that is, the rotor 100 includes the rotating shaft 1, the rotor support 4, the rotor core 2 and the permanent magnet 3 which are sequentially connected from inside to outside. The rotor core 2 is formed by stacking rotor laminations. It should be noted that fig. 1 shows only one implementation of a permanent magnet motor, where the permanent magnet 3 of the permanent magnet motor is located at the periphery of the rotor core 2, and in other implementations, the position relationship between the permanent magnet 3 and the rotor core 2 may also be in the form of embedding, inserting, and the like.

The structure of the rotor 100 can be used for a medium and small power permanent magnet motor, and if the structure is used for a high power permanent magnet motor, the axial lengths of the rotating shaft 1, the rotor bracket 4 and the rotor iron core 2 need to be increased on the basis of the medium and small power permanent magnet motor. The length of the rotating shaft 1 is increased, the processing is not complex, and the axial length of the rotor core 2 is increased only by increasing the number of the stacked rotor sheets; however, increasing the length of the rotor frame 4 involves complicated processes and large-scale processing equipment, and requires a larger workshop operating space during the assembly of the rotating shaft and the rotor frame. According to analysis of the background technology, various conditions such as the existing equipment conditions, material conditions, process conditions, workshop space and the like can not meet the requirement of processing the high-power permanent magnet motor rotor.

In order to solve the problem, the technical idea of the utility model is to avoid directly processing the longer spider of length, and through two, three, even the series connection of a plurality of miniature spider realizes the spider of a longer length. The small rotor support can still be processed in batch under the existing processing conditions, so that the problem of processing the rotor support with longer length is solved.

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Referring to fig. 2-3, fig. 2 is a schematic structural diagram of a permanent magnet motor rotor according to an embodiment of the present invention, and fig. 3 is a sectional view taken along line a-a of fig. 2. The rotor 200 includes a rotation shaft 10, a rotor bracket 40, a rotor core 20, and permanent magnets (not shown); in fig. 2, the core 20 and the permanent magnet are both covered by the end caps. The rotor 200 comprises a first bracket 41 and a second bracket 42, which are coaxially arranged, forming a rotor bracket 40. The rotor bracket 40 is sleeved on the rotating shaft 10 and fixed by a connecting key 80 between the rotor bracket 40 and the rotating shaft 10. The rotor core 20 is arranged outside the rotor bracket 40, and the rotor bracket 40 and the rotor core 20 are fixedly connected together through a positioning rib 50. The use of the rotor holder 40 can reduce the weight of the entire rotor 200. The rotor 200 is a double-support structure, the rotor support 40 is formed by coaxially connecting a first support 41 and a second support 42, and the first support 41 and the second support 42 have the same structure and size. For the motor, the rotor support formed by the two supports is completely equivalent to the rotor support formed by independent processing, but for the processing, the processing difficulty can be greatly reduced.

Specifically, referring to fig. 4-5, fig. 4 is a schematic structural view of a rotor bracket according to an embodiment of the present invention, and fig. 5 is a cross-sectional view of C-C of fig. 4. The rotor holder 40 includes an inner cylinder 411 and an outer cylinder 412, the outer cylinder 412 is sleeved outside the inner cylinder 411, a support plate 413 is disposed between the inner cylinder 411 and the outer cylinder 412, and a shaft hole is formed in the inner cylinder 411. The inner cylinder 411 and the outer cylinder 412 are coaxial, and the support plate 413 is used for supporting the coaxial structure of the inner cylinder 411 and the outer cylinder 412, so that the structural reliability is improved. The supporting plate 413 comprises an annular plate and a rib plate, the annular plate is sleeved on the inner cylinder, the inner side of the annular plate is connected with the inner cylinder, and the outer side of the annular plate is connected with the outer cylinder; the rib plates are uniformly arranged in the circumferential direction and extend along the axial direction. When the first bracket 41 and the second bracket 42 are assembled, the end surfaces of the inner cylinders of the two brackets are arranged oppositely, shaft holes are formed in the inner parts of the inner cylinders, the end surfaces of the outer cylinders of the two brackets are also arranged oppositely, and the outer peripheral surfaces of the outer cylinders of the two brackets form the outer sides of the rotor bracket. The second bracket 42 has the same structure as the first bracket 41, and will not be described herein.

Further, as shown in fig. 4 and 5, the inner side of the inner cylinder 411 is further provided with a key groove 4111, the key groove 4111 is matched with the connecting key 80 in fig. 3, and correspondingly, the rotating shaft 10 is also provided with a key groove (not shown) matched with the connecting key 80. The connecting key 80 may be a flat key or another connecting key. During assembly, it is necessary to align the first bracket 41 with the key slot on the second bracket 42. The above structure fixedly connects the rotating shaft 10 and the rotor bracket 40, and also connects the first bracket 41 and the second bracket 42 in series. The key groove 4111 needs to be machined by using a wire cutting device, and since the first bracket 41 has a small size, only a general wire switching device is needed for machining the key groove 4111 on the inner cylinder 411, and a large-scale wire switching device is not needed.

Further, a plurality of positioning ribs 50 are disposed on the outer wall of the outer cylinder 412, and the positioning ribs 50 are disposed in the positioning grooves of the rotor core 20. The positioning ribs 50 are used for fixedly connecting the rotor holder 40 to the rotor core 20. Specifically, in order to reduce iron loss, the rotor core 20 is formed by stacking a plurality of rotor sheets, and each rotor sheet has the same size. Each rotor punching sheet is provided with a jack, and the plurality of jacks which are coaxially arranged and communicated with each other form the positioning groove (not marked in the figure). Therefore, the stacked rotor sheets can be tensioned by the positioning ribs 50.

In one embodiment, referring to fig. 6 and 7, fig. 6 shows a structure of a positioning rib, and fig. 7 is a sectional view of the positioning rib. The positioning rib 50 is a dove tail rib, and the cross section of the positioning rib is dove tail. Accordingly, the above-mentioned positioning groove of the rotor core 20 is also dove-tail shaped. A plurality of mounting holes (not marked in the figure) are provided in the outer cylinder 412, a plurality of screw holes 501 are provided in the positioning ribs 50, and bolts are inserted into the mounting holes from the outer cylinder 412 and are fixedly connected to the screw holes 501 by screw threads. By tightening the bolts, the rotor core 20 is securely mounted on the rotor bracket 40, and the connection of the first bracket 41 and the second bracket 42 is also strengthened.

Further, the rotor punching sheet can be tensioned in a mode of arranging the long and short ribs in a staggered mode. Specifically, the positioning ribs 50 (shown in fig. 2 and 3, there are 12 positioning ribs) are uniformly arranged on the outer peripheral surface of the rotor holder 40, each positioning rib 50 includes a long rib and a short rib, for example, the positioning rib 50 includes a long rib 51 and a short rib 52, and the two long and short ribs of two adjacent positioning ribs are arranged in a staggered manner. The long ribs 51 refer to positioning ribs having a length exceeding the axial length of one bracket 41, and the short ribs 42 refer to positioning ribs having a length smaller than the axial length of one bracket 41. For example, in fig. 2, the first positioning rib 50, the second positioning rib, the third positioning rib, the fourth positioning rib, the fifth positioning rib, and so on are provided in this order in the clockwise direction. Correspondingly, the first positioning rib 50 is sequentially provided with a long rib 51 and a short rib 52 from left to right, the second positioning rib is provided with a short rib and a long rib from left to right, and the third positioning rib is provided with a long rib and a short rib from left to right; by analogy, the layout of the long rib and the short rib of each positioning rib is different from that of the adjacent positioning rib. Fixed assembly is realized through the mode of long and short rib, can save forging blank, need not to use large-scale equipment processing length to reach two supports and even the location muscle more than two supports. More beneficially, the whole piece of location muscle in every constant head tank is divided into length two, and crisscross assembly during the assembly to can also realize straining rotor punching more reliably.

In the above embodiment, long and short ribs are used to cover the entire length of rotor core 20, and in other embodiments, a plurality of short ribs, for example, three short ribs with equal length, may be used to cover the entire length of rotor core 20.

In one embodiment, the rotor support 40 is sleeved on the rotating shaft by a shrink-fit process. The hot jacket process utilizes the principle of expansion with heat and contraction with cold to realize interference fit. The equipment of the hot jacket process mainly comprises a positioning tool and a heating mechanism, wherein the rotating shaft is positioned through the positioning tool, the rotor support is heated through the heating mechanism, and then the rotor support is sleeved on the rotating shaft so that the rotating shaft penetrates through the shaft hole of the rotor support. The rotor support 40 comprises a first support 41 and a second support 42, when the sleeve is heated, the first support 40 and the second support 42 can be sequentially sleeved on the rotating shaft 10, the whole rotor support 40 does not need to be sleeved on the rotating shaft, and the operation mode has low requirement on the operation space and can be completed in the existing workshop.

The permanent magnet motor rotor of the double-bracket structure is described in detail above, and two brackets are adopted to form a rotor bracket. In the processing process, the processing of the bracket is the same as that in the prior art, the existing processing conditions can be directly utilized, and large-scale processing equipment does not need to be purchased. Namely, one long rotor bracket is divided into two short brackets, a general linear cutting device can process the key slot in the bracket, and because the bracket is short, the requirements of various auxiliary parts on equipment for turning, milling and drilling are low, the processing time is short, and the production and processing cost is reduced; and when the supports are respectively sleeved on the rotating shaft in a hot mode, the whole height is low, and the operation can be carried out in a common workshop by utilizing the existing hot sleeving equipment.

In other embodiments, three or more brackets may be used to form a single rotor bracket in order to realize a longer shaft permanent magnet machine. In this case, two long ribs of equal or unequal length (one support length < long rib length < two support lengths) may be used to tension the rotor core, or a plurality of short ribs (short rib length < one support length) may be used to fixedly connect the rotor core, for example, four short positioning ribs of equal length are used.

It should be noted that, although the present invention is described from the problem of the high power permanent magnet motor, it should be understood by those skilled in the art that the multiple support structures of the present invention can also be applied to the medium and low power permanent magnet motor.

In the above description of the present specification, the terms "fixed," "mounted," "connected," or "connected," and the like, are to be construed broadly unless otherwise expressly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, it is for the purpose of facilitating the explanation of the invention and simplifying the description, and it is not intended to state or imply that the devices or elements involved must be in the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be interpreted or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, accordingly, to cover module compositions, equivalents, or alternatives falling within the scope of the claims.

Claims (10)

1. A rotor of a permanent magnet motor is characterized by comprising a rotating shaft, a rotor bracket and a rotor iron core which are sequentially connected from inside to outside;

the rotor support comprises at least two supports which are coaxially arranged;

a shaft hole is formed in the rotor support, the shaft hole is fixedly assembled with the rotating shaft, and the rotor support is sleeved on the rotating shaft;

and the outer side of the rotor bracket is fixedly assembled with the rotor core.

2. The rotor of a permanent magnet motor according to claim 1, wherein each of said brackets includes an inner cylinder and an outer cylinder, said shaft hole is formed by communicating the interiors of two or more inner cylinders, and the outer side of said rotor bracket is formed by the outer peripheral surfaces of two or more outer cylinders.

3. The rotor of a permanent magnet motor according to claim 2, wherein the bracket further comprises a support plate between the inner cylinder and the outer cylinder, the support plate comprising an annular plate and a rib plate; the annular plate is sleeved on the inner cylinder; the rib plates are uniformly arranged in the circumferential direction and extend along the axial direction.

4. The rotor of a permanent magnet motor according to claim 2, wherein a connecting key is provided between the inner cylinder and the rotating shaft, and key slots are provided on the inner cylinder and the rotating shaft respectively; the connecting key is used for connecting the inner barrel and the rotating shaft.

5. The rotor of a permanent magnet motor according to claim 1, wherein a plurality of positioning ribs are arranged between the outer side of the rotor support and the rotor core, and the positioning ribs extend in the axial direction and are uniformly distributed in the circumferential direction.

6. The rotor of a permanent magnet motor according to claim 5, wherein each positioning rib is formed by two ribs with different lengths, and the ribs of two adjacent positioning ribs are arranged in a staggered manner.

7. The rotor of a permanent magnet electric machine according to claim 5, wherein the cross section of the positioning rib is dove-tail type; the positioning rib is provided with a plurality of threaded holes perpendicular to the extending direction of the positioning rib, the outer side of the rotor support is provided with mounting holes corresponding to the threaded holes, and the mounting holes and the threaded holes are used for penetrating bolts to fixedly connect the rotor support and the rotor core.

8. The rotor of a permanent magnet motor according to claim 5, wherein the rotor core is provided with positioning grooves fitted with the positioning ribs.

9. The rotor of a permanent magnet motor according to claim 8, wherein the rotor core is formed by stacking a plurality of rotor sheets, each rotor sheet has the same size, each rotor sheet is provided with an insertion hole, and the positioning grooves are formed by the plurality of insertion holes which are communicated with each other.

10. The rotor of a permanent magnet electric machine according to any of claims 1 to 9, wherein permanent magnets are further provided on the rotor core.

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