CN111697720A - Motor rotors and permanent magnet motors - Google Patents

Abstract

The invention discloses a rotor for a motor and a permanent magnet motor. The rotor for the motor comprises a rotating shaft, a rotor core and a permanent magnet, wherein the permanent magnet is arranged in the rotor core, the rotor also comprises a mounting bracket, a shaft hole is formed in the mounting bracket, and the rotating shaft is arranged in the shaft hole; rotor core is the sleeve structure, rotor core cover is in the outside of installing support is through adopting the installing support to install rotor core in the pivot. The mounting bracket is of a bracket body structure, the weight of the mounting bracket is light, and the weight of the rotor core can be effectively reduced to reduce the weight of the permanent magnet motor.

Description

Motor rotors and permanent magnet motors

technical field

The present invention relates to a motor, in particular to a rotor for a motor and a permanent magnet motor.

Background technique

Motors are commonly used electrical components in industrial production. Among them, permanent magnet motors are widely used in industrial production due to their high efficiency and small size. A permanent magnet motor generally includes a stator and a rotor, wherein winding coils are arranged on the stator and permanent magnets are arranged on the rotor. In the prior art, the rotor iron core of the rotor in the permanent magnet motor is usually a solid structure, which leads to the heavy weight of the permanent magnet motor. How to design a light-weight permanent magnet motor is the technical problem to be solved by the present invention.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a rotor for a motor and a permanent magnet motor to reduce the overall weight of the permanent magnet motor.

The technical solution provided by the present invention is a rotor for a motor, comprising a rotating shaft, a rotor iron core and a permanent magnet, wherein the permanent magnet is arranged in the rotor iron core, and also includes a mounting bracket, on which a shaft is arranged The rotating shaft is installed in the shaft hole; the rotor iron core is in a sleeve structure, and the rotor iron core is sleeved on the outside of the installation bracket.

Further, the mounting bracket includes an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, a support plate is arranged between the outer cylinder and the inner cylinder, and the inner cylinder is formed with the shaft hole.

Further, the support plate includes an annular plate and a rib, the annular plate is sleeved on the inner cylinder and is arranged between the inner cylinder and the outer cylinder, and the rib is along the inner cylinder. An axis extends and is disposed between the inner barrel and the outer barrel.

Further, the outer wall of the outer cylinder is provided with a plurality of positioning ribs, the inner wall of the rotor core is provided with a plurality of positioning grooves, and the positioning ribs are inserted into the positioning grooves.

Further, the positioning groove is a dovetail structure, and the cross section of the positioning rib is also a dovetail structure.

Further, the outer cylinder is provided with a plurality of installation holes, the positioning rib is provided with a plurality of threaded holes, and bolts are inserted into the installation holes from the outer cylinder and screwed into the threaded holes.

Further, both ends of the rotor iron core are respectively provided with second pressure rings, and the second pressure rings cover the positioning grooves.

Further, the rotating shaft is provided with a first keyway, the shaft hole is provided with a second keyway, the rotating shaft is connected with the mounting bracket through a key, and the key is located in the first keyway and the second keyway. in the keyway.

Further, the rotor core includes a plurality of second mounting pieces connected together in sequence, a plurality of insertion holes are arranged on the second installation piece around its axis, and a plurality of the insertion holes that are coaxially arranged and communicated with each other are formed. The slot is provided with the permanent magnet.

The present invention also provides a permanent magnet motor, which includes a stator and the above-mentioned rotor.

Compared with the prior art, the advantages and positive effects of the present invention are: the rotor iron core is mounted on the rotating shaft by using the mounting bracket, the mounting bracket is a frame structure, the weight of the mounting bracket is light, and the rotor iron core can be effectively reduced. to reduce the weight of the permanent magnet motor.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of permanent magnet motor of the present invention;

2 is a cross-sectional view of a permanent magnet motor of the present invention;

3 is an exploded view of the permanent magnet motor of the present invention;

Fig. 4 is the structural schematic diagram of the rotor of the present invention;

Fig. 5 is the sectional view of the rotor of the present invention;

Fig. 6 is the exploded view of the rotor of the present invention;

FIG. 7 is an assembly diagram of two adjacent second mounting pieces.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIGS. 1-3 , the permanent magnet motor in this embodiment includes a motor body 100 , a frequency conversion module 200 and a water cooling plate 300 , wherein the motor body 100 includes a stator 1 , a rotor 2 and a casing 3 , and the stator 1 and the rotor 2 are Installed in the casing 3, the frequency conversion module 200 is installed on the casing 3 through a water cooling plate 300, and a water flow channel is formed in the water cooling plate 300, and cooling water flows into the water flow channel of the water cooling plate 300 to realize heat dissipation to the motor body 100 and the frequency conversion module 200.

Among them, there are structural improvements in the following aspects for the rotor 2, which will be specifically described with reference to the accompanying drawings.

For rotor 2. As shown in FIGS. 4-7 , the rotor 2 includes a rotating shaft 21 , a rotor iron core 22 and a permanent magnet 23 , and the rotor iron core 22 has a sleeve structure. In order to make the permanent magnets 23 evenly distributed on the rotor iron core 22 to obtain the best motor efficiency, the rotor iron core 22 is provided with several slots around its axis, and the slots are along the axis direction of the rotor iron core 22 Extending arrangement, the permanent magnets 23 are strip-shaped structures and inserted into the corresponding slots, and the rotor iron core 22 is sleeved on the outside of the rotating shaft 21 . Specifically, the slots are evenly distributed around the axis of the rotor core 22 near the outer circumference of the rotor core 22. Correspondingly, a permanent magnet 23 is inserted into each slot, so as to ensure that every The distances between the permanent magnets 23 and the axis of the rotor core 22 are the same, so that higher motor efficiency can be obtained. The slot is also provided with oppositely arranged backing plates 231 , the permanent magnets 23 are sandwiched between the two backing plates 231 , and the backing plates 231 can isolate the permanent magnets 23 and install them in the slot.

Similarly, in order to effectively reduce the weight of the rotor 2, the rotor 2 further includes a mounting bracket 24, the mounting bracket 24 is provided with a shaft hole (not marked), the rotating shaft 21 is installed in the shaft hole, and the rotor iron core 22 is sleeved on the shaft hole. The outside of the mounting bracket 24 . Specifically, the rotating shaft 21 and the rotor iron core 22 are assembled together by the mounting bracket 24 , and the overall weight of the mounting bracket 24 is relatively light, which can effectively reduce the overall weight of the rotor iron core 22 . In order to facilitate the installation of the rotating shaft 21 into the shaft hole in the mounting bracket 24 , the rotating shaft 21 is provided with a first keyway, the shaft hole is provided with a second keyway, and the rotating shaft 21 is connected with the mounting bracket 24 through a key 211 , the key 211 is located in the first keyway and the second keyway.

The mounting bracket 24 includes an inner cylinder 242 and an outer cylinder 241, the outer cylinder 241 is sleeved outside the inner cylinder 242, a support plate 243 is provided between the outer cylinder 241 and the inner cylinder 242, and the shaft hole is formed in the inner cylinder 242. Specifically, the inner and outer cylinders are used to form the mounting bracket 24, which can better meet the assembly requirements of the rotating shaft 21 and the rotor core 22. During the processing, as long as the inner cylinder 242 and the outer cylinder 241 are ensured to be coaxially arranged, when assembling , it can be ensured that the rotor iron core 22 and the rotating shaft 21 are coaxially arranged, so as to reduce the difficulty of assembly. In order to improve the connection reliability between the inner cylinder 242 and the outer cylinder 241 , the support plate 243 includes an annular plate and a rib plate. The annular plate is sleeved on the inner cylinder 242 and arranged between the inner cylinder 242 and the outer cylinder 241 , the ribs extend along the axis of the inner cylinder 242 and are arranged between the inner cylinder 242 and the outer cylinder 241 .

Further, in order to improve the assembly efficiency and accuracy of the rotor iron core 22, the rotor iron core 22 includes a plurality of second mounting pieces 221 which are connected together in sequence. The sockets are formed by a plurality of the sockets, which are arranged on the shaft and communicate with each other. Specifically, the rotor core 22 is fabricated by stacking a plurality of second mounting pieces 221 together, and each second mounting piece 221 has the same structural size, so that a rotor of suitable size can be set as required. The iron core 22 can also ensure that the processing dimensions of the rotor iron core 22 are kept consistent, so as to improve the assembly efficiency and accuracy. The insertion hole formed by the second mounting piece 221 will form a slot for inserting the permanent magnet 23 after the multilayered second mounting piece 221 is assembled. The insertion hole is close to the outer circumference of the second mounting piece 221 , so that the permanent magnet 23 can be closer to the stator 1 .

Further, the second mounting piece 221 includes a plurality of second arc-shaped pieces 2211, and the plurality of second arc-shaped pieces 2211 are butted together in sequence to form the second mounting piece 221, and each second arc-shaped piece 2211 is provided with at least one one of the jacks. Specifically, the plurality of second arc-shaped pieces 2211 are butted together in sequence to form the second mounting piece 221, which can reduce the processing size of the single-layer second mounting piece 221 and effectively reduce the difficulty of processing. Preferably, for the two second mounting pieces 221 abutting together, the second arc-shaped piece 2211 in one of the second mounting pieces 221 and the two second arcs in the other second mounting piece 221 that are butted together The shaped pieces 2211 abut together. Specifically, the second arc-shaped pieces 2211 in the two adjacent layers of the second mounting pieces 221 are arranged in a staggered position. The staggered arrangement of the second arc-shaped pieces 2211 can effectively increase the restraint and restraint between the second arc-shaped pieces 2211 in the two layers of the second installation pieces 221, so that the force of each second arc-shaped piece 2211 is stronger. uniform, and the overall structural strength is higher.

In order to improve the assembly reliability between the second mounting pieces 221, the rotor core 22 further includes a first tension rod 25; the second mounting piece 221 is also provided with a first through hole 223, and the first through hole 223 is close to the first through hole 223. The outer circumferences of the two mounting pieces 221 are located between the two adjacent insertion holes; a plurality of first through holes 223 that are coaxially arranged and communicated with each other form a first tension channel, and the first tension rod 25 is inserted into In the corresponding first tensioning channel, both ends of the first tensioning rod 25 are threadedly connected with first locking nuts. At the same time, the rotor core 22 further includes a second tension rod 26; the second mounting piece 221 is also provided with a second through hole 224, and the second through hole 224 is close to the inner circumference of the second mounting piece 221; A plurality of second through holes 224 that communicate with each other form a second tightening channel, the second tightening rod 26 is inserted into the corresponding second tightening channel, and the two ends of the second tightening rod 26 are threadedly connected with a second tightening channel. Two lock nuts. Specifically, in the process of assembling the multilayer second mounting piece 221 , the second mounting piece 221 is mounted on the first tension rod 25 and the second tension rod 26 through the first through hole 223 and the second through hole 224 , using two tension rods to further play the function of assembling and positioning. Preferably, both ends of the rotor core 22 are respectively provided with first pressure rings 27 , the first pressure rings 27 cover the slots, and the first tension rod 25 clamps the second mounting piece 221 between the two first pressure rings 27 . Between circle 27.

Furthermore, the outer wall of the outer cylinder 241 is provided with a plurality of positioning ribs 244, and the inner wall of the rotor core 22 is provided with a plurality of positioning grooves, and the positioning ribs 244 are inserted in the positioning grooves. Specifically, the positioning groove is formed by providing a notch structure 225 in the inner ring of the second mounting plate, and the positioning ribs 244 cooperate with the positioning groove, so that the rotor core 22 can be firmly and reliably installed on the mounting bracket 24 . In order to improve the connection reliability, the positioning groove is a dovetail structure, and the cross section of the positioning rib 244 is also a dovetail structure. Preferably, the outer cylinder 241 is provided with a plurality of installation holes (not shown), the positioning ribs 244 are provided with a plurality of threaded holes (not marked), and bolts are inserted into the installation holes from the outer cylinder 241 and screwed on the in the threaded hole. Specifically, in the process of assembling the rotor core 22 to the mounting bracket 24 , the positioning ribs 244 are first loosened, so that the positioning ribs 244 can be smoothly inserted into the corresponding positioning grooves. Finally, the bolts are tightened so that the rotor core 22 is fastened on the mounting bracket 24 . In addition, the two ends of the rotor core 22 are respectively provided with second pressure rings 28 , the second pressure rings 28 cover the positioning grooves, and the two second pressure rings 28 are mutually tightened by the second tension rods 26 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a rotor for a motor, comprising a rotating shaft, a rotor iron core and a permanent magnet, the permanent magnet is arranged in the rotor iron core, it is characterized in that, also comprises a mounting bracket, the mounting bracket is provided with a shaft hole, The rotating shaft is installed in the shaft hole; the rotor iron core is in a sleeve structure, and the rotor iron core is sleeved on the outside of the installation bracket. 2 . The rotor for a motor according to claim 1 , wherein the mounting bracket comprises an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, and the outer cylinder and the inner cylinder A support plate is arranged therebetween, and the shaft hole is formed in the inner cylinder. 3 . The rotor for a motor according to claim 2 , wherein the support plate comprises an annular plate and a rib plate, and the annular plate is sleeved on the inner cylinder and arranged on the inner cylinder and the outer cylinder. 4 . Between the cylinders, the ribs extend along the axis of the inner cylinder and are arranged between the inner cylinder and the outer cylinder. 4 . The rotor for a motor according to claim 1 , wherein a plurality of positioning ribs are arranged on the outer wall of the outer cylinder, and a plurality of positioning grooves are arranged on the inner wall of the rotor iron core, and the positioning ribs are inserted into the rotor. 5 . in the positioning groove. 5 . The rotor for a motor according to claim 4 , wherein the positioning groove is a dovetail structure, and the cross section of the positioning rib is also a dovetail structure. 6 . 6 . The motor rotor according to claim 4 , wherein the outer cylinder is provided with a plurality of mounting holes, the positioning ribs are provided with a plurality of threaded holes, and bolts are inserted into the outer cylinder from the outer cylinder. 7 . The mounting holes are described above and screwed into the threaded holes. 7 . The rotor for a motor according to claim 4 , wherein the two ends of the rotor iron core are respectively provided with second pressure rings, and the second pressure rings cover the positioning grooves. 8 . 8 . The rotor for a motor according to claim 1 , wherein a first keyway is arranged on the rotating shaft, a second keyway is arranged in the shaft hole, and the rotating shaft is connected with the mounting bracket through a key, 9 . The key is located in the first keyway and the second keyway. 9 . The rotor for a motor according to claim 1 , wherein the rotor iron core comprises a plurality of second mounting pieces that are connected together in sequence, and the second mounting pieces are provided around its axis with a A plurality of sockets are arranged coaxially and communicated with each other to form the sockets, and the permanent magnets are arranged in the sockets. 10. A permanent magnet motor, comprising a stator, and further comprising the rotor according to any one of claims 1-9.

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