CN212033850U

CN212033850U - Rotor core and injection molding rotor with same

Info

Publication number: CN212033850U
Application number: CN202020140967.0U
Authority: CN
Inventors: 李文瑞
Original assignee: Huaian Welling Motor Manufacturing Co Ltd
Current assignee: Huaian Welling Motor Manufacturing Co Ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-11-27
Anticipated expiration: 2030-01-21

Abstract

The utility model discloses a rotor core and have its injection molding rotor, rotor core include along a plurality of rotor punching of axial superpose, the rotor punching includes interior annular region and a plurality of outer fan-shaped region, the center in annular region constitutes rotor core's shaft hole, constitutes the mounting groove between two outer fan-shaped regions adjacent in circumference; at least one of the rotor punching sheets is an outer bridge-cut punching sheet, and the outer bridge-cut punching sheet is disconnected between the radial outer sides of every two adjacent outer sector areas; on at least one outer bridge-cut-off type punching sheet, each outer sector area is provided with outer baffle bridges on two circumferential sides, and the outer baffle bridges are positioned on the radial outer sides of the mounting grooves to stop on the permanent magnets; at the connecting position of the outer baffle bridge and the outer sector area, the distance between the radial outer side edge of the outer baffle bridge and the shaft hole is smaller than the distance between the radial outer side edge of the outer sector area and the shaft hole. The utility model discloses a rotor core can reduce the back electromotive force distortion rate, and it is undulant to reduce the torque, improves the noise.

Description

Rotor core and injection molding rotor with same

Technical Field

The utility model belongs to the technical field of the motor technique and specifically relates to a rotor core and have its rotor of moulding plastics is related to.

Background

In the related art, along with the continuous upgrading of the energy efficiency requirement, the design and the manufacture of the motor are continuously optimized, and the requirements on cost and performance are also continuously improved. The existing motor parts have already been improved in structure and have small improvement space, but the motor still has not little noise, and various factories are still dedicated to the improvement of the motor parts.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a rotor core to optimize and produce the property ability.

The utility model discloses still aim at providing one kind and have above-mentioned rotor core and have its rotor of moulding plastics.

According to the embodiment of the utility model, rotor core includes a plurality of rotor punching sheets that superpose along the axial, rotor punching sheet includes interior annular region and a plurality of outer fan-shaped region, a plurality of outer fan-shaped region encircle the setting of interior annular region, the center of interior annular region constitutes rotor core's shaft hole, constitute the mounting groove that is used for installing the permanent magnet between two adjacent outer fan-shaped region in circumference; at least one of the rotor punching sheets is an outer bridge-cut punching sheet, and the outer bridge-cut punching sheets are disconnected between every two adjacent outer sector areas; on at least one outer bridge-cut-off type punching sheet, outer baffle bridges are arranged on two circumferential sides of each outer sector area, and are located on the radial outer sides of the mounting grooves to stop on the permanent magnets; and at the connecting part of the outer baffle bridge and the outer sector area, the distance between the radial outer side edge of the outer baffle bridge and the shaft hole is smaller than the distance between the radial outer side edge of the outer sector area and the shaft hole.

According to the utility model discloses rotor core through setting up the outer fender bridge of formula of sinking, can reduce the back electromotive force distortion rate of rotor, reduces the torque fluctuation, improves the noise to improve rotor core's structural performance.

In some embodiments, the rotor punching sheet comprises an outer connecting bridge type punching sheet, and an outer connecting bridge is connected between every two adjacent outer sector regions of the outer connecting bridge type punching sheet; the rotor core is used for injection molding the rotor, and the rotor punching sheet corresponding to the injection mold of the injection molding rotor at the mold closing position is the outer connecting bridge type punching sheet.

In some embodiments, the number of the outer connecting bridge type punching sheets is less than or equal to one third of the number of the rotor punching sheets.

In some embodiments, the outer bridge type stamped sheet is adopted at least one end of the rotor core, and the middle part of the rotor core contains the outer bridge type stamped sheet or the outer bridge type stamped sheet.

In some embodiments, the outer bridge is provided with a relief groove at a side facing the mounting groove, the relief groove for filling an injection molding material to relieve pressure when the rotor core is injection molded.

In some embodiments, the outer bridge segment punching sheet comprises: the fully-connected-external bridge-cut-off type stamped sheet is characterized in that an internal connecting bridge is connected between each outer sector region and each inner annular region; the semi-continuous-external bridge-cut-off type punching sheet is characterized in that an internal connecting bridge is connected between only one half of the external sector area and the internal annular area of the semi-continuous-external bridge-cut-off type punching sheet, and the other half of the external sector area and the internal annular area are disconnected.

In some embodiments, at least a part of the rotor punching sheet is provided with a supporting bridge corresponding to the mounting groove, and the supporting bridge is connected to the outer periphery of the inner annular area so as to be supported on the permanent magnet in a stop way.

Specifically, it is same to correspond the permanent magnet, part rotor core support the bridge and be the direct bridge, part rotor core support the bridge and be the bent bridge, the radial length of the direct bridge equals interior annular region with interval supports between the permanent magnet, the radial length of the bent bridge is greater than interior annular region with interval supports in order to be the bending deformation state between the permanent magnet.

Furthermore, the rotor punching plates at the two ends of the rotor core are provided with straight supporting bridges, the middle of the rotor core is only provided with bent supporting bridges, and the supporting bridges are eliminated from the rest of the rotor punching plates.

In some embodiments, the outer sector areas of at least two of the rotor sheets are provided with compensation holes, and the compensation holes are used for filling compensation blocks.

In some alternative embodiments, the rotor core is provided with a suction hole, and the suction hole forms a shrinkage cavity at one axial end.

According to the utility model discloses rotor of moulding plastics, include: a rotor core according to the present invention; the permanent magnets are respectively matched in the mounting grooves; the injection molding body, it is a plurality of the permanent magnet cooperation is in behind the rotor core, the injection molding body is moulded by the material package of moulding plastics with the permanent magnet with the rotor core package is moulded into an organic whole.

According to the utility model discloses rotor of moulding plastics through encircleing a plurality of outer fan-shaped region interior annular region and setting up, constitutes the mounting groove that is used for installing the permanent magnet between two outer fan-shaped regions of circumference adjacent for rotor of moulding plastics is built-in tangential magnetization structure, is favorable to improving the permanent magnet and gathers magnetic capacity. Through the arrangement of the rotor punching sheet with the sinking type outer retaining bridge, the back electromotive force distortion rate can be reduced, the torque fluctuation is reduced, and the vibration noise is reduced.

In some embodiments, the injection molded body is an unsaturated resin material piece or an epoxy resin piece.

In some embodiments, the permanent magnet is formed by molding the permanent magnet and the rotor core into a whole by the injection molding body and then magnetizing the whole.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of a rotor core according to an embodiment of the present invention;

fig. 2 is a front view of a rotor sheet in an embodiment of the present invention (wherein, the rotor sheet is an outer connecting bridge sheet);

fig. 3 is a front view of a rotor sheet according to an embodiment of the present invention (wherein the rotor sheet is an outer connecting bridge type sheet, and the outer connecting bridge is provided with a pressure relief groove on one side facing the mounting groove);

fig. 4 is a front view of a rotor sheet according to an embodiment of the present invention (in which, the rotor sheet is an external bridge-cut sheet, and the supporting bridge is a straight supporting bridge);

fig. 5 is a front view of a rotor sheet according to an embodiment of the present invention (in which, the rotor sheet is an external bridge-cut sheet, and the supporting bridge is a bent supporting bridge);

fig. 6 is a front view of a rotor sheet according to an embodiment of the present invention (wherein, the rotor sheet is a full-continuous-external bridge-type sheet);

fig. 7 is a front view of a rotor sheet according to an embodiment of the present invention (wherein, the rotor sheet is a semi-continuous-external bridge-type sheet);

fig. 8 is a schematic cross-sectional view of a rotor core according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a rotor core and a permanent magnet according to an embodiment of the present invention (in which the rotor core and the permanent magnet are cut away to show an internal assembly relationship);

fig. 10 is a perspective view of a rotor according to an embodiment of the present invention;

fig. 11 is an exploded view of a rotor according to an embodiment of the present invention;

fig. 12 is a diagram illustrating an optimized scheme of a rotor core according to an embodiment of the present invention;

FIG. 13 is a diagram of simulated and actual measured back emf waveforms for a rotor employing a sunk outer axle configuration;

FIG. 14 is a comparison graph of back emf harmonic content measured when a conventional outer bridge and a sunken outer bridge are provided on a rotor core;

FIG. 15 is a comparison graph of 6 octave noise amplitudes of rotors using a conventional outer bridge and a submerged outer bridge at full speed.

Reference numerals:

an injection molding rotor 1000,

A rotor core 100,

The rotor punching sheet 1, the inner annular region 11, the shaft hole 111, the outer sector region 12, the mounting groove 121, the outer connecting bridge 122, the pressure relief groove 1221, the outer baffle bridge 123, the outer connecting bridge punching sheet 13, the outer bridge-broken punching sheet 14, the full-connecting-outer bridge-broken punching sheet 141, the half-connecting-outer bridge-broken punching sheet 142, the inner connecting bridge 143, the supporting bridge 15, the straight supporting bridge 151, the bent supporting bridge 152, the compensation hole 16, the embedding hole 161, the suction hole 17, the suction inlet 171,

Permanent magnet 200, injection molding 300, rotor shaft 400.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A rotor core 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 11.

According to the embodiment of the present invention, as shown in fig. 1 to 7, the rotor core 100 is provided with a shaft hole 111 and a plurality of mounting grooves 121, and the plurality of mounting grooves 121 are disposed around the shaft hole 111 to mount the plurality of permanent magnets 200. Here, the rotor core 100 may have an integrated structure, and the rotor core 100 may also be formed by stacking a plurality of rotor sheets 1.

In some embodiments, as shown in fig. 8, the rotor core 100 is provided with a compensation hole 16 for installing a compensation block (not shown), the compensation hole 16 is located between two adjacent installation slots 121 of the rotor core 100 (as shown in fig. 1, the compensation hole 1 may be provided on a sector area), at least one end of the compensation hole 16 in the axial direction is an insertion opening 161 so that a portion of the compensation block is inserted from the insertion opening 161, and the insertion opening 161 is a reduced opening so that the compensation block and the rotor core 100 form a snap-in connection at the insertion opening 161.

It should be noted that, the compensation block is also called as a balance block in some schemes, the rotor is provided with the compensation block for improving the rotating balance of the rotor during rotation, and the balance principle of the compensation block is the prior art and is not described herein again.

When the compensation holes 16 are configured as described above, the compensation blocks may be configured in various structures to form a snap-fit connection with the rotor core 100. Taking fig. 8 as an example, it is assumed that the compensation hole 16 is a cylindrical hole, the insertion opening 161 is a round opening with a diameter slightly smaller than that of the cylindrical hole, and the portion of the compensation block inserted into the compensation hole 16 is a cylinder. One form of the compensating block is to form the cylinder into a standard cylinder having the same diameter as the cylinder hole, press the cylinder into the compensating hole 16 from the insertion opening 161 by using a press, and the cylinder and the insertion opening 161 are slightly deformed during the press-fitting process, but the portion of the pressed rotor core 100 surrounding the insertion opening 161 is tightly clamped on the cylinder. Sometimes the portion of the cylinder at the insertion opening 161 is deformed into a groove, making it difficult to remove the cylinder from the rotor. In another form of the compensating block, a groove is directly formed in the outer circumferential wall of the cylinder, and when the compensating block is inserted into the compensating hole 16, the portion of the rotor core 100 surrounding the insertion opening 161 can be clamped in the groove, wherein the diameter of the groove may be slightly larger than the diameter of the insertion opening 161 or slightly smaller than the diameter of the insertion opening 161.

Here, the shape of the compensation hole 16 is not particularly limited, and the shape of the insertion opening 161 is not particularly limited. The insertion opening 161 may be a tapered opening or a stepped opening.

Therefore, the utility model discloses rotor core 100 sets up to the throat through the embedding mouth 161 with 16 one ends in compensation hole, makes compensation piece and rotor core 100 form the buckle formula in embedding mouth 161 department and is connected to can chucking compensation piece, make the rotor still can connect on rotor core 100 firmly after high-speed rotation.

In the embodiment of the present invention, the compensation hole 16 can be both ends of the axial direction to be the insertion hole 161 (the necking), so that the rotor core 100 can be installed with the compensation block on both end surfaces of the axial direction. The compensation hole 16 may have only one axial end formed with an insertion opening 161 (a reduced opening), and in this case, the rotor core 100 may have the compensation block mounted only on the end surface of the end provided with the insertion opening 161.

In some embodiments, as shown in fig. 8, the rotor core 100 is provided with a suction hole 17 for sucking the debris, the suction hole 17 is located between two adjacent mounting grooves 121 of the rotor core 100 (the suction hole 17 may be provided on a sector area as shown in fig. 1), and at least one end of the suction hole 17 in the axial direction is a suction port 171, and the suction port 171 is a flared port. Thus, the suction holes 17 can form a negative pressure region when the rotor rotates at a high speed, thereby sucking away external debris. The suction port 171 of the suction hole 17 is formed as a flare, which is advantageous for enlarging the suction range of chips and improving the cleanliness of the working environment of the rotor.

Here, the shape of the suction hole 17 is not particularly limited, and the shape of the suction port 171 is not also particularly limited. The suction port 171 may be a divergent flare or a stepped flare. In the rotor core 100 in which a plurality of rotor sheets 1 are stacked, the compensation hole 16 is formed in at least two rotor sheets 1, and at least one of the rotor sheets 1 has an insertion opening 161 formed therein.

In some embodiments, as shown in fig. 1, the rotor core 100 includes a plurality of rotor sheets 1 stacked in the axial direction, each rotor sheet 1 includes an inner annular region 11 and a plurality of outer sector regions 12, the plurality of outer sector regions 12 are disposed around the inner annular region 11, the center of the inner annular region 11 forms a shaft hole 111 of the rotor core 100, and a mounting groove 121 for mounting the permanent magnet 200 is formed between two circumferentially adjacent outer sector regions 12.

The structure is a built-in tangential magnetizing structure, and is beneficial to improving the magnetic gathering capacity of the permanent magnet 200 matched with the rotor core 100.

In some embodiments, as shown in fig. 1, the rotor punching sheet 1 includes at least one outer bridge type punching sheet 13, as shown in fig. 2 and 3, an outer bridge 122 is connected between every two adjacent outer sector regions 12 of the outer bridge type punching sheet 13, and the outer bridge 122 is located radially outside the mounting groove 121. The outer bridge 122 is arranged to limit and fix the permanent magnet 200. When the permanent magnet 200 is suitable for assembling the rotor core 100, the outer bridge 122 may limit the permanent magnet 200 from moving toward the radial outer side of the mounting groove 121, and may reduce the permanent magnet 200 from being separated from the mounting groove 121, so that the mounting and operation stability of the permanent magnet 200 may be improved.

In some embodiments, as shown in fig. 1, the rotor sheet 1 includes at least one outer bridge-cut sheet 14, as shown in fig. 4 and 5, the outer bridge-cut sheet 14 is disconnected between every two adjacent outer sector regions 12, so that the internal pressure of the rotor can be relieved.

In some optional embodiments, the rotor punching sheet 1 includes an outer bridge type punching sheet 13 and an outer bridge type punching sheet 14, so that the combined structure can achieve multiple purposes of both positioning and pressure relief, and some schemes can achieve other purposes.

For example, in some specific examples, the rotor core 100 is used for injection molding a rotor, and the rotor laminations 1 corresponding to the injection mold of the injection molded rotor at the mold closing position are outer connecting bridge laminations 13.

Like this in compound die position department, can reduce the production of the flash burr of moulding plastics of production to can improve the performance of product, if the noise reduction, and the qualification rate is high, and production maneuverability is strong. For example, patent nos.: CN201810552685 discloses a motor with a new structure by arranging different inner magnetic bridges, claim 9 specifies the plastic-coated structure of a rotor core, and the rotor sheets of this patent are all outer bridge-broken sheets, which may have burrs during production and implementation, affecting product performance, and resulting in low yield.

In some embodiments, the number of the outer connecting bridge type punching sheets 13 is less than or equal to one third of the number of the rotor punching sheets 1. This is convenient for magnetizing rotor core 100, and outer connecting bridge type punching sheet 13 can be regarded as the compound die position, and outer connecting bridge 122 also can improve the job stabilization nature of the product after magnetizing.

In some embodiments, as shown in fig. 1, at least one end of the rotor core 100 employs an outer bridge punching sheet 13, and a middle portion of the rotor core 100 includes an outer bridge-breaking punching sheet 14 or an outer bridge punching sheet 13. The outer connecting bridge 122 can play a role in material sealing, the stability of the injection molding process is improved, and the injection molding quality of the injection molding rotor is improved.

In some embodiments, as shown in fig. 3, the outer bridge 122 is provided with a pressure relief groove 1221 at a side facing the mounting groove 121, and the pressure relief groove 1221 is used to fill injection molding material to relieve pressure when the rotor core 100 is injection molded. It can be understood that the non-pressure-release groove of the outer connecting bridge 122 facing the mounting groove 121 can be used for fixing and limiting the permanent magnet 200, and a space is formed between the pressure-release groove 1221 of the outer connecting bridge 122 facing the mounting groove 121 and the permanent magnet 200 for flowing injection molding material, releasing pressure and improving the injection molding quality of the injection molding rotor.

In some embodiments, as shown in fig. 4 and 5, on at least one outer bridge-cutoff stamped steel 14, each outer sector-shaped area 12 is provided with outer bridges 123 at two circumferential sides, and the outer bridges 123 are located at the radial outer side of the mounting groove 121 to stop on the permanent magnet 200. The arrangement of the outer bridges 123 can limit and fix the permanent magnets 200, and injection molding materials can be filled between two adjacent outer bridges 123 to release pressure when the rotor core 100 is injected. When the permanent magnet 200 is suitable for the rotor core 100 to be matched, the outer bridge 123 can limit the permanent magnet 200 to move towards the radial outer side of the mounting groove 121, and the situation that the permanent magnet 200 is separated from the mounting groove 121 can be reduced, so that the mounting and operation stability of the permanent magnet 200 is further improved.

In some embodiments, as shown in fig. 1, at the junction of the outer bridge 123 and the outer sector area 12, the distance between the radially outer side of the outer bridge 123 and the axial hole 11 is smaller than the distance between the radially outer side of the outer sector area 12 and the axial hole 111. That is, the radial outer side of the outer bridge 123 is closer to the shaft hole 11, and the radial outer side of the outer sector area 12 is farther from the shaft hole, so that the outer bridge 123 forms a sunken outer bridge.

Specifically, in the solution of the present application, the inventors have conducted a multi-directional research on the optimization of the outer shape of the rotor core 100 in order to optimize the magnetic circuit. According to the simulation and actual measurement results, it is shown that optimizing the common outer bridge on the rotor core to the sinking outer bridge as shown in fig. 12 can make the optimized magnetic circuit adapted to the high-impact stator, obtain a lower back electromotive force distortion rate, reduce torque fluctuation and improve noise.

Fig. 13 shows the simulated and measured back electromotive force waveform of the rotor using the sunken outer baffle bridge in operation, the waveform of the rotor can be seen to approach the standard sine wave, and the waveform distortion is small.

Fig. 14 shows a comparison of the measured back emf harmonic content for a conventional outer bridge and a sunk outer bridge on the rotor core. It can be seen from the figure that the harmonic content of the sunk outer baffle bridge scheme is greatly reduced in 5 th order and 7 th order compared with that of the common outer baffle bridge scheme, which proves that the optimized design of the rotor structure is effective on the basis of considering the edge effect.

When setting up ordinary outer fender bridge and setting up the outer fender bridge of formula of sinking on the rotor core, will contain this rotor core's motor application to air conditioner fan, carry out the frequency sweep to the noise of the whole rotational speed operating range of air conditioner fan system this moment and know: the 6 frequency doubling noise lines of the sinking type external blocking bridge scheme are obviously dull, the bright band appears in the full frequency band of the common external blocking bridge scheme considering the impact shear stress, the local resonance bright spots appear only in individual rotating speed of the sinking type external blocking bridge scheme, and the noise amplitude is obviously reduced. In addition, other secondary noise levels of the sinking type outer blocking bridge scheme are also reduced, and the noise of the motor is obviously improved.

Fig. 15 shows a comparison graph of the noise amplitude of the conventional outer axle scheme and the sunk outer axle scheme at 6 times frequency within the full rotation speed range, and it can be seen that when the rotation speed of the motor enters the high rotation speed region, the 6 times frequency noise of the sunk outer axle scheme is significantly lower than the 6 times frequency noise of the conventional outer axle scheme.

In conclusion, the scheme of the application utilizes the sunken blocking bridge, so that the distortion rate of the counter potential can be reduced, the torque fluctuation can be reduced, and the vibration noise can be reduced.

In some embodiments, as shown in fig. 6 and 7, the outer bridge punch 14 includes: a full-connection-external bridge-cut-off type punching sheet 141 and a half-connection-external bridge-cut-off type punching sheet 142. As shown in fig. 6, the full-continuous/external bridge segment punching sheet 141 is connected with an internal connecting bridge 143 between each of the outer sector region 12 and the inner annular region 11. As shown in fig. 7, only half of the half connecting-outer breaking bridge sheet 142 has the inner connecting bridge 143 connected between the outer sector region 12 and the inner ring region 11, and the other half of the outer sector region 12 is disconnected from the inner ring region 11. It can be understood that, in the full continuous-external bridge segment punching sheet 141, the internal connecting bridge 143 is connected between each of the outer sector regions 12 and the inner annular region 11, so that the connection strength between the outer sector regions 12 and the inner annular region 11 can be improved, and the operation stability of the rotor core 100 can be improved. In the half continuous-outer bridge segment punching sheet 142, the inner connecting bridge 143 is connected between half of the outer sector region 12 and the inner annular region 11, so that the connection strength between the outer sector region 12 and the inner annular region 11 can be further improved, and the operation stability of the rotor core 100 can be improved. The other half of the outer sector area 12 is disconnected from the inner annular area 11, which saves material, increases assembly flexibility and helps relieve internal pressure. Thus, the outer bridge type punching sheet 14 includes: the full-continuous-external bridge-break type punching sheet 141 and the half-continuous-external bridge-break type punching sheet 142 can improve the structural strength of the rotor core 100 and save materials.

Optionally, in the half-link-outer bridge-break stamped sheet 142, the inner connecting bridges 143 are axially and rotationally arranged, and the rotation angle is ((2k +1)180/N) °, where k is a natural number and N is the number of the inner connecting bridges 143. Thus, the semi-continuous-external bridge-cut-off type punching sheet 142 is reasonable in layout and high in structural strength, and is beneficial to further improving the operation stability of the rotor core 100.

In some embodiments, as shown in fig. 1 and 8, at least a portion of the rotor punching sheet 1 is provided with a supporting bridge 15 corresponding to the mounting groove 121, and the supporting bridge 15 is connected to the outer circumference of the inner annular region 11 to be supported against the permanent magnet 200. The supporting bridge 15 can limit and support the permanent magnet 200, and the stability of installation and operation of the permanent magnet 200 can be further improved.

Specifically, corresponding to the same permanent magnet 200, as shown in fig. 1 and 8, the support bridges 15 of a part of the rotor core 100 are the straight support bridges 151, and the support bridges 15 of a part of the rotor core 100 are the bent support bridges 152, as shown in fig. 4 and 9, the radial length of the straight support bridges 151 is equal to the distance between the inner annular region 11 and the permanent magnet 200 to support the permanent magnet 200, and as shown in fig. 5 and 9, the radial length of the bent support bridges 152 is greater than the distance between the inner annular region 11 and the permanent magnet 200 to support the permanent magnet 200 in a bent deformed state. It can be understood that the radial length of the straight supporting bridge 151 is equal to the distance between the inner annular region 11 and the permanent magnet 200, so that the supporting bridge 15 can play a role of supporting the permanent magnet 200 and can also improve the positioning accuracy of the permanent magnet 200. The radial length of the bent support bridge 152 is greater than the distance between the inner annular region 11 and the permanent magnet 200 to support the permanent magnet 200 in a bending deformation state, so that the pressing acting force between the permanent magnet 200 and the bent support bridge 152 can be improved, and the installation and operation stability of the permanent magnet 200 can be further improved under the action of the acting force.

Further, the rotor sheets 1 at the two ends of the rotor core 100 are provided with the straight supporting bridges 151, only part of the rotor sheets 1 in the middle of the rotor core 100 are provided with the bent supporting bridges 152, and the supporting bridges 15 are omitted from the rest of the rotor sheets 1. This facilitates the assembly of the permanent magnet 200, may provide a good support effect for the permanent magnet 200, and may further save material.

Of course, in the embodiment of the present invention, the combination manner of the supporting bridges 15 on each punching sheet is not limited to the above example, and the straight supporting bridges 151, the bent supporting bridges 152 and the non-bridge punching sheet may be arbitrarily combined in a reasonable state.

A rotor core 100 in one embodiment of the present invention is described below with reference to fig. 1-8.

According to the utility model discloses rotor core 100, rotor core 100 include along a plurality of rotor punching 1 of axial superpose, and rotor punching 1 includes interior annular region 11 and a plurality of outer sector region 12, and a plurality of outer sector region 12 encircle interior annular region 11 and set up, and the center of interior annular region 11 constitutes rotor core 100's shaft hole 111, constitutes the mounting groove 121 that is used for installing permanent magnet 200 between two adjacent outer sector region 12 in circumference. The outer sector areas 12 of the at least two rotor sheets 1 are provided with compensation holes 16, and the compensation holes 16 are used for filling compensation blocks. The rotor core 100 is provided with a receiving hole 17, and the receiving hole 17 is formed as a counterbore at one axial end.

The rotor punching sheet 1 comprises an outer connecting bridge type punching sheet 13 and an outer bridge type punching sheet 14.

The outer bridge type punching sheet 13 is connected with an outer bridge 122 between every two adjacent outer sector regions 12, and the outer bridge 122 is located on the radial outer side of the mounting groove 121. The outer bridge 122 is provided at a side facing the mounting groove 121 with a pressure relief groove 1221, and the pressure relief groove 1221 is used to fill an injection molding material to relieve pressure when the rotor core 100 is injection molded. The rotor core 100 is used for injection molding the rotor 1000, and the rotor sheet 1 corresponding to the injection mold of the injection molding rotor 1000 at the mold closing position is an external connecting bridge sheet 13. One end of the rotor core 100 is an external bridge type punching sheet 13. The number of the outer connecting bridge type punching sheets 13 is less than or equal to one third of the number of the rotor punching sheets 1.

The outer bridge-type breaking sheets 14 are disconnected between every two adjacent outer sector regions 12. On the outer bridge-cut-off type punching sheet 14, each outer sector region 12 is provided with outer bridges 123 at both circumferential sides, and the outer bridges 123 are located at the radial outer side of the mounting groove 121 to stop on the permanent magnet 200. The outer bridge-cut type punching sheet 14 includes: a full-connection-external bridge-cut-off type punching sheet 141 and a half-connection-external bridge-cut-off type punching sheet 142. The full-continuous-external bridge-cut-off type stamped piece 141 is connected with an internal connecting bridge 143 between each external sector area 12 and the internal annular area 11. Only half of the half connecting-outer bridge-disconnecting punching sheet 142 is connected with the inner connecting bridge 143 between the outer sector region 12 and the inner annular region 11, and the other half of the outer sector region 12 is disconnected with the inner annular region 11.

At least part of the rotor punching sheet 1 is provided with a supporting bridge 15 corresponding to the mounting groove 121, and the supporting bridge 15 is connected to the periphery of the inner annular region 11 to be supported on the permanent magnet 200. Corresponding to the same permanent magnet 200, the support bridges 15 of part of the rotor core 100 are straight support bridges 151, the support bridges 15 of part of the rotor core 100 are bent support bridges 152, the radial length of the straight support bridges 151 is equal to the distance between the inner annular region 11 and the permanent magnet 200 to support the permanent magnet 200, and the radial length of the bent support bridges 152 is greater than the distance between the inner annular region 11 and the permanent magnet 200 to support the permanent magnet 200 in a bending deformation state. The rotor laminations 1 at the two ends of the rotor core 100 are provided with the straight supporting bridges 151, only part of the rotor laminations 1 in the middle of the rotor core 100 are provided with the bent supporting bridges 152, and the supporting bridges 15 are omitted on the rest of the rotor laminations 1.

Of course, in other embodiments of the present invention, the above-mentioned features may be formed on the rotor core 100 in any combination, and are not limited herein.

An injection molded rotor 1000 according to an embodiment of the present invention is described below with reference to the drawings.

According to the utility model discloses rotor 1000 moulds plastics, include: as shown in fig. 10 and 11, a rotor core 100, a plurality of permanent magnets 200, and an injection molded body 300. The rotor core 100 is the rotor core 100 according to the above embodiments of the present invention, and here, the specific structure of the rotor core 100 has been described in detail above, and is not described in detail here. The plurality of permanent magnets 200 are fitted in the plurality of mounting grooves 121, respectively. After the plurality of permanent magnets 200 are fitted to the rotor core 100, the injection molded body 300 is overmolded with an injection molding material to overmold the permanent magnets 200 and the rotor core 100 into a single piece.

According to the utility model discloses rotor 1000 moulds plastics, through surrounding the regional 11 settings of interior annular with a plurality of outer fan-shaped regions 12, constitute the mounting groove 121 that is used for installing permanent magnet 200 between two adjacent outer fan-shaped regions 12 in circumference for rotor 1000 moulds plastics is built-in tangential magnetization structure, is favorable to improving permanent magnet 200 and gathers magnetic capacity. Through the arrangement of the rotor punching sheet 1 with the sinking type outer retaining bridge, the back electromotive force distortion rate can be reduced, the torque fluctuation is reduced, and the vibration noise is reduced.

In some embodiments, injection molded body 300 is a piece of unsaturated resin material or an epoxy. Thus, the hardness and strength of the injection molded body are high, and the operational stability of the injection molded rotor 1000 can be improved.

Optionally, the injection molding body 300 may be a PBT part, which has the advantages of light weight, high strength, insulation, corrosion resistance, high utilization rate, high molding rate, stable product quality, convenient operation, and the like, and is convenient for molding of injection molding parts and beneficial to improving the stability of injection molding parts. Of course, in some other embodiments, the injection molding body 300 may also be a BMC component, which has excellent electrical insulation, heat resistance, flame resistance, high mechanical strength, dimensional stability, and shrinkage stability, and is easy to process, and the molding surface is smooth, which is beneficial to improving the performance of the injection molding rotor 1000. The particular form of the injection-molded part is not restricted here.

Alternatively, the rotor 1000 may be fitted with a stator pack. The stator assembly is formed by axially arranging and combining chain-type ferromagnetic materials, and the composite rotor assembly is formed by axially laminating punching sheets in different shapes.

In some embodiments, the rotor 1000 further comprises: the compensation block, a part of the compensation block is inserted into the compensation hole 16 from the insertion opening 161, the compensation block and the rotor core form a buckle type connection at the insertion opening 161, the projection area of the part of the compensation block located outside the compensation hole 16 is larger than that of the part located inside the compensation hole 16, and the projection area is the projection area of the corresponding part of the compensation block on the end face of the rotor core. By the arrangement, the position of the compensation block is further limited, and the position stability of the compensation block is improved.

A rotor 1000 in one embodiment of the present invention is described below with reference to the drawings.

According to the utility model discloses rotor 1000, include: rotor core 100, a plurality of permanent magnets 200, and injection molded body 300. The rotor core 100 is the rotor core 100 according to the above embodiments of the present invention. The plurality of permanent magnets 200 are fitted in the plurality of mounting grooves 121, respectively. After the plurality of permanent magnets 200 are fitted to the rotor core 100, the injection molded body 300 is overmolded with an injection molding material to overmold the permanent magnets 200 and the rotor core 100 into a single piece. The injection molded body 300 is an unsaturated resin material piece or an epoxy resin piece. The permanent magnet 200 is formed by wrapping and molding the permanent magnet 200 and the rotor core 100 into a whole by an injection molding body 300 and then magnetizing the same. The utility model provides a pain point of present trade, improved the primary qualification rate of production greatly, have simple structure reasonable, technology simplification, produce the characteristics that the property ability uniformity is high.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor core is characterized by comprising a plurality of rotor punching sheets which are axially overlapped, wherein each rotor punching sheet comprises an inner annular region and a plurality of outer fan-shaped regions, the outer fan-shaped regions are arranged around the inner annular region, the center of the inner annular region forms a shaft hole of the rotor core, and a mounting groove for mounting a permanent magnet is formed between every two adjacent outer fan-shaped regions in the circumferential direction; wherein,

at least one of the rotor punching sheets is an outer bridge-cut punching sheet, and the outer bridge-cut punching sheets are disconnected between every two adjacent outer sector areas; wherein,

on at least one outer bridge-cut-off type punch, each outer sector area is provided with outer blocking bridges on two circumferential sides, and the outer blocking bridges are positioned on the radial outer side of the mounting groove to block the permanent magnets; and,

at the connecting position of the outer baffle bridge and the outer sector area, the distance between the radial outer side edge of the outer baffle bridge and the shaft hole is smaller than the distance between the radial outer side edge of the outer sector area and the shaft hole.

2. The rotor core according to claim 1, wherein the rotor punching sheet comprises an outer connecting bridge type punching sheet, and an outer connecting bridge is connected between every two adjacent outer sector-shaped regions of the outer connecting bridge type punching sheet; the rotor core is used for injection molding the rotor, and the rotor punching sheet corresponding to the injection mold of the injection molding rotor at the mold closing position is the outer connecting bridge type punching sheet.

3. The rotor core according to claim 2, wherein the number of the outer connecting bridge type punching sheets is less than or equal to one third of the number of the rotor punching sheets.

4. The rotor core according to claim 2, wherein the outer bridge type stamped sheet is adopted at least one end of the rotor core, and the middle part of the rotor core comprises the outer bridge type stamped sheet or the outer bridge type stamped sheet.

5. The rotor core according to claim 2, wherein the outer bridge is provided with a relief groove at a side facing the mounting groove, the relief groove for filling an injection molding material to relieve pressure when the rotor core is injection molded.

6. The rotor core of claim 1, wherein the outer bridge segment is stamped with:

the fully-connected-external bridge-cut-off type stamped sheet is characterized in that an internal connecting bridge is connected between each outer sector region and each inner annular region;

the semi-continuous-external bridge-cut-off type punching sheet is characterized in that an internal connecting bridge is connected between only one half of the external sector area and the internal annular area of the semi-continuous-external bridge-cut-off type punching sheet, and the other half of the external sector area and the internal annular area are disconnected.

7. The rotor core according to claim 1, wherein at least a portion of the rotor segments are provided with support bridges corresponding to the mounting slots, the support bridges being connected to an outer circumference of the inner annular region to be supported against the permanent magnets.

8. The rotor core according to claim 7, wherein a portion of the support bridges of the rotor core are straight support bridges, and a portion of the support bridges of the rotor core are bent support bridges, a radial length of each straight support bridge is equal to a distance between the inner annular region and the permanent magnet to support the permanent magnet, and a radial length of each bent support bridge is greater than a distance between the inner annular region and the permanent magnet to support the permanent magnet in a bending deformation state.

9. The rotor core according to claim 8, wherein the rotor laminations at the two ends of the rotor core are provided with straight supporting bridges, only part of the rotor laminations in the middle of the rotor core are provided with bent supporting bridges, and the supporting bridges are eliminated on the rest of the rotor laminations.

10. The rotor core according to any one of claims 1-9, wherein at least two of the rotor sheets are provided with compensation holes in their outer sector areas, the compensation holes being used for filling compensation blocks.

11. The rotor core according to any one of claims 1 to 9, wherein the rotor core is provided with a suction hole, and the suction hole is formed with a shrinkage cavity at one axial end.

12. An injection molded rotor, comprising:

a rotor core according to any one of claims 1-11;

the permanent magnets are respectively matched in the mounting grooves;

the injection molding body, it is a plurality of the permanent magnet cooperation is in behind the rotor core, the injection molding body is moulded by the material package of moulding plastics with the permanent magnet with the rotor core package is moulded into an organic whole.

13. The rotor of claim 12, wherein the injection molded body is an unsaturated resin material piece or an epoxy resin piece.

14. The rotor of claim 12, wherein the permanent magnet is formed by molding the permanent magnet and the rotor core into a whole by the injection molding body and then magnetizing the same.