CN211046593U - Rotor and motor - Google Patents

Abstract

The application discloses a rotor and a motor. The rotor includes: the rotor core comprises a shaft ring part and a plurality of fan-shaped parts arranged around the shaft ring part at intervals, and a shaft hole is formed in the shaft ring part; the rotor shaft is inserted into the shaft hole, and the diameter of the shaft hole is larger than the shaft diameter of the rotor shaft; and the plastic coating part is filled between the rotor shaft and the inner wall of the shaft hole. Through making the package mould the piece and fill between the inner wall in rotor shaft and shaft hole, the rotor that this application provided can reduce the epaxial axle voltage of rotor, reaches the effect that improves bearing galvanic corrosion.

Description

Rotor and motor

Technical Field

The application relates to the technical field of motors, in particular to a rotor and a motor.

Background

The direct current brushless motor is more and more widely applied due to the advantages of high efficiency, energy conservation and the like. The existing brushless dc motor adopts PWM (Pulse width modulation) modulation driving control, which is easy to generate larger shaft voltage and cause electric corrosion of bearings on the motor.

SUMMERY OF THE UTILITY MODEL

The main technical problem who solves of this application provides a rotor and motor to solve the great problem that easily causes bearing electric corrosion on the motor of the shaft voltage on the motor.

In order to solve the technical problem, the application adopts a technical scheme that: a rotor is provided. The rotor includes: the rotor core comprises a shaft ring part and a plurality of fan-shaped parts arranged around the shaft ring part at intervals, and a shaft hole is formed in the shaft ring part; the rotor shaft is inserted into the shaft hole, and the diameter of the shaft hole is larger than the shaft diameter of the rotor shaft; and the plastic coating part is filled between the rotor shaft and the inner wall of the shaft hole.

In a specific embodiment, the rotor shaft comprises a shaft body and a shaft groove arranged on the shaft body, and the outer diameter of the shaft groove is smaller than that of the shaft body; the shaft groove is located in the shaft hole, and the plastic wrapping part is filled between the shaft groove and the inner side wall of the shaft hole.

In a specific embodiment, the axial groove has a length in the axial direction that is greater than a length of the axial hole in the axial direction.

In a specific embodiment, the surface of the shaft groove is convexly or concavely provided with a retaining part.

In a specific embodiment, the rotor further includes a plurality of magnets, an accommodating groove is formed between two adjacent sectors, each magnet is embedded in one accommodating groove, and the magnet protrudes from an end surface of the rotor core.

In a specific embodiment, the plastic-coated member coats the magnet, and the plastic-coated member includes:

an end face covering portion covering the magnet of the end face of the rotor core and exposing the fan-shaped portion of the end face of the rotor core;

and the shaft hole filling part is connected with the end face covering part and is filled between the rotor shaft and the inner wall of the shaft hole.

In one embodiment, the end face covering portion is formed with at least one positioning hole corresponding to each magnet.

In a specific embodiment, the plastic-coated part further comprises a side filling part, wherein the side filling part is connected with the end face covering part, covers the magnet on the side face of the rotor core, and exposes the fan-shaped part on the side face of the rotor core.

In one embodiment, the end surface covering portion includes a plurality of magnet covering sub-portions and a collar covering sub-portion, the plurality of magnet covering sub-portions being radially connected to the collar covering sub-portion; and a retainer ring is connected between the two adjacent magnet covering sub-parts and is positioned on the outer periphery of the fan-shaped part.

In order to solve the above technical problem, another technical solution adopted by the present application is: an electric machine is provided. The motor comprises a rotor as described above.

The beneficial effect of this application is: in contrast to the state of the art, the present application discloses a rotor and a motor. Through making the package mould the piece and filling between the inner wall in rotor shaft and shaft hole to keep apart and insulating rotor core and rotor shaft, thereby can change the electrostatic capacity of rotor one side, make the electrostatic capacity of rotor one side easily reach the equilibrium with the electrostatic capacity of complex stator one side, and then can reduce the epaxial shaft voltage of rotor, reach the effect of improving bearing galvanic corrosion.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural view of an embodiment of a rotor provided herein;

FIG. 2 is a schematic cross-sectional structural view of the rotor of FIG. 1;

FIG. 3 is an exploded view of the rotor of FIG. 1;

FIG. 4 is a schematic cross-sectional structural view of the rotor of FIG. 1;

FIG. 5 is a schematic view of the construction of the rotor shaft in the rotor of FIG. 1;

FIG. 6 is a schematic front view of the rotor of FIG. 1;

fig. 7 is a schematic view of a rotor core structure in the rotor of fig. 1.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

If in the embodiments of the present application there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is 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 such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a rotor provided in the present application.

As shown in fig. 1 to 3, the rotor 100 includes a rotor core 10, a rotor shaft 30, a plurality of magnets 20, and an overmold 40, wherein the plurality of magnets 20 are embedded in the rotor core 10, the rotor shaft 30 is assembled with the rotor core 10, and the overmold 40 is overmolded on the rotor core 10 so as to combine the rotor core 10, the plurality of magnets 20, and the rotor shaft 30.

As shown in fig. 3, the rotor core 10 includes a collar portion 12 and a plurality of sectors 14 disposed at intervals around the collar portion 12, the collar portion 12 being formed with a shaft hole 120; a receiving groove 16 is formed between two adjacent sectors 14 to form a plurality of receiving grooves 16.

A plurality of magnets 20, each magnet 20 is embedded in one of the receiving slots 16, that is, the plurality of magnets 20 and the plurality of sectors 14 are alternately arranged along the circumferential direction of the collar 12. The magnets 20 are embedded in the accommodating grooves 16, and the N-level and the S-level of the magnets 20 are respectively attached to the side surfaces of the two adjacent sectors 14, the polarities of the opposite surfaces of the adjacent magnets 20 are the same, that is, the polarities of the adjacent magnets 20 are S-level or N-level, the sectors 14 clamped by the two adjacent magnets 20 are correspondingly represented as S or N magnetic polarities, and the polarities of the adjacent sectors 14 are opposite to each other.

It is noted that the rotor core 10 includes an even number of sectors 14, and the even number of sectors 14 repeatedly exhibit S-level and N-level magnetic polarities in the circumferential direction in sequence and form a closed magnetic circuit. In addition, to make the magnetic circuits evenly distributed, the plurality of receiving grooves 16 are evenly distributed along the circumferential direction of the collar portion 12.

Because a built-in magnet structure is adopted, namely the magnet 20 is embedded into the accommodating groove 16 of the rotor core 10, and the side surface of the rotor core 10 is the side surface of the rotor 100, the length of an air gap formed when the rotor 100 is matched with a corresponding stator is greatly reduced, the magnetic conduction loss of the air gap is further reduced, and the magnetic flux in the stator is favorably and greatly improved; in addition, the magnets 20 are embedded in the accommodating grooves 16 and alternately arranged with the sectors 14, so that the volume ratio of the rotor 100 to the magnets 20 can be increased, the sectors 14 can effectively utilize the magnetic flux generated by a pair of magnetic poles of each magnet 20, and the research shows that the magnetic concentration effect of the rotor 100 is improved by more than 20% compared with the traditional surface-mounted magnet structure.

Alternatively, the magnet 20 may be, for example, a ferrite-based sintered magnet or a neodymium magnet. The magnet 20 is configured, for example, as a rectangular parallelepiped or a trapezoidal body, and is disposed in the housing groove 16 and penetrates the rotor core 10 in the axial direction of the rotor core 10.

As shown in fig. 2, magnet 20 protrudes from the end face of rotor core 10, that is, the axial length of magnet 20 along rotor core 10 is greater than the axial length of rotor core 10. The magnet 20 may protrude from one end surface of the rotor core 10, or both ends of the magnet 20 may protrude from two opposite end surfaces of the rotor core 10, respectively, so as to facilitate magnetic flux leakage from the protruding end portions of the magnet 20, thereby improving magnetic flux of the rotor 100.

In this embodiment, two ends of the magnet 20 respectively protrude from two opposite end faces of the rotor core 10, and the lengths of the two end faces of the rotor core 10 protruding from the magnet 20 are different, wherein the end of the magnet 20 protruding from the end face of the rotor core 10 by a longer length is used for installing a sensor, so as to monitor the operating state of the rotor 100.

The covering member 30 on the end of the magnet 20 protruding from the end surface of the rotor core 10 by a long length facilitates the provision of a connection structure for mounting a sensor. For example, the plastic covering 40 is provided with a connection hole, or the sensor is engaged with the plastic covering 40.

Referring to fig. 2 to 4, the rotor shaft 30 is inserted into the shaft hole 120, and the diameter of the shaft hole 120 is larger than the diameter of the rotor shaft 30. The rotor shaft 30 is coaxially disposed with the shaft hole 120 so that the rotor 100 as a whole is dynamically balanced, and the rotor shaft 30 and the rotor core 10 are integrated by the over-mold 40.

Specifically, the plastic-coated member 40 is filled between the inner walls of the rotor shaft 30 and the shaft hole 120 to isolate and insulate the rotor core 10 from the rotor shaft 30, and the rotor shaft 30 and the rotor core 10 are fixed, so that the electrostatic capacity of one side of the rotor 100 is changed, the electrostatic capacity of one side of the rotor 100 and the electrostatic capacity of one side of the stator matched with the rotor 100 are easily balanced, the shaft voltage on the rotor shaft 30 can be reduced, and the effect of improving the electric corrosion of the bearing is achieved.

Specifically, as shown in fig. 5, the rotor shaft 30 includes a shaft body 32 and a shaft groove 34 provided on the shaft body 32, the outer diameter of the shaft groove 34 being smaller than the outer diameter of the shaft body 32; the shaft groove 34 is located in the shaft hole 120, and the plastic coating 40 is filled between the shaft groove 34 and the inner side wall of the shaft hole 120.

Since the shaft groove 34 is formed in the shaft body 32 and the shaft groove 34 is located in the shaft hole 120, the diameter of the shaft hole 120 can be relatively reduced, the effective usable area of the rotor core 10 can be increased, and the length of the magnet 20 in the radial direction of the rotor core 10 can be increased to increase the functional density of the rotor 100 without changing the filler volume between the rotor shaft 30 and the inner wall of the shaft hole 120.

Further, the axial length of the axial slot 34 is greater than the axial length of the axial hole 120, and the axial slot 34 is aligned and coaxially disposed with the axial hole 120, so as to further increase the effective use area of the rotor core 10 and increase the length of the magnet 20 in the radial direction of the rotor core 10.

In some embodiments, a plurality of shaft grooves 34 may be further disposed on the shaft body 32, the plurality of shaft grooves 34 are distributed at intervals on the shaft body 32, and the plurality of shaft grooves 34 are all located in the shaft hole 120, so that the plastic coating 40 is filled between the plurality of shaft grooves 34 and the inner side wall of the shaft hole 120, which may increase the rotation torque between the rotor shaft 30 and the rotor core 10, and prevent the rotor shaft and the rotor core from loosening.

In other embodiments, the surface of the shaft groove 34 is convexly or concavely formed with an anti-drop part 340 for increasing the rotation torque between the rotor shaft 30 and the rotor core 10 and preventing the motor from dropping between the rotor shaft 30 and the rotor core 10 during use.

For example, the slip-off preventing portion 340 in the shape of a chip suction groove is formed on the surface of the axial groove 34, or the slip-off preventing portion 340 in the shape of a boss is formed on the surface of the axial groove 34, and the rotational torque between the rotor shaft 30 and the rotor core 10 can be increased by coupling the overmold 40 to the slip-off preventing portion 340.

As shown in fig. 1, 4 and 6, the plastic coating member 40 further coats the magnets 20 and is formed at least in the end surface of the rotor core 10 and the shaft hole 120, so that the plurality of magnets 20 are fixed with respect to the rotor core 10 while isolating and insulating the rotor core 10 and the rotor shaft 30.

Further, the plastic coating member 40 may be formed on a side surface of the rotor core 10 to coat the magnets 20 and further fix the plurality of magnets 20 and the rotor core 10.

In this embodiment, the plastic-coated member 40 includes an end face covering portion 42, a side face filling portion 44, and a shaft hole filling portion 46, the end face covering portion 42 covers two opposite end faces of the rotor core 10, the side face filling portion 44 covers a side face of the rotor core 10, and the shaft hole filling portion 46 is filled between the inner walls of the rotor shaft 30 and the shaft hole 120.

The end face covering portion 42 covers the magnets 20 on the end face of the rotor core 10 and exposes the segment 14 on the end face of the rotor core 10, that is, the end face covering portion 42 covers at least the magnets 20 on the end face of the rotor core 10 and exposes at least part of the segment 14 on the end face of the rotor core 10.

The end face covering portion 32 covers and wraps the magnet 20 at a portion protruding from the end face of the rotor core 10, and serves to fix the magnet 20 in the axial direction. Positioning holes are also provided on both opposite side surfaces of the magnet 20 for positioning the axial length of the end surface of the magnet 20 protruding out of the rotor core 10.

The sector portion 14 is formed with a balance hole 140, the balance hole 140 is exposed to the end surface covering portion 42, that is, the balance hole 140 is provided in a portion of the sector portion 14 exposed from the end surface covering portion 32, and the balance hole 140 penetrates the sector portion 14. The balance hole 140 can reduce the weight of the rotor core 10, dissipate heat from the rotor core 10, and perform dynamic balance correction on the rotor 100 by filling the balance hole 140 with a material to increase the weight.

Specifically, the end surface covering portion 42 includes a plurality of magnet covering sub-portions 422 and a collar covering sub-portion 420, the plurality of magnet covering sub-portions 422 are radially connected to the collar covering sub-portion 420, the collar covering sub-portion 420 covers the collar portion 12, each magnet covering sub-portion 422 covers one of the magnets 20, a space is formed between the magnet covering sub-portions 422 and exposes the sector portion 14, and the exposed portion of the sector portion 14 is provided with the balance hole 140. A retaining ring 423 is connected between two adjacent magnet covering subsections 422, the retaining ring 423 is located on the outer periphery of the sector 14, and cooperates with the magnet covering subsections 422 to surround the balance hole 140, so as to prevent the filler from overflowing to the side surface of the rotor core 10 when the balance hole 140 is filled.

Further, at least one positioning hole 424 is formed on the end surface covering portion 42 corresponding to each magnet 20. For example, two positioning holes 424 are formed in the end face covering portion 42 corresponding to each magnet 20. The positioning hole 424 is used for positioning the magnet 20, and the material consumption of the end face covering portion 42 can be reduced, and further, the positioning hole 424 can be filled with material to perform dynamic balance correction on the rotor 100.

The side surface filling portion 44 is connected to the end surface covering portion 42, covers the magnet 20 on the side surface of the rotor core 10, and exposes the sector portion 14 on the side surface of the rotor core 10.

It should be noted that the side filling portions 34 are connected to the side of the rotor core 10 in alignment, i.e., the connection is smooth, so as to reduce the wind resistance suffered by the rotor 100 during rotation.

Specifically, as shown in fig. 4 and 7, the sector 14 protrudes away from the outer edge of the collar portion 12 toward the receiving groove 16 to form a stopping portion 141, and the magnet 20 abuts against the stopping portion 141; the two opposing blocking portions 141 between two adjacent sectors 14 form a gap 142, and the existence of the gap 142 is beneficial to greatly reduce the leakage flux of the rotor core 10. The side filling parts 44 are filled in the gaps 142, and the side filling parts 44 are connected in alignment with the sides of the rotor core 10, and the side filling parts 44 are connected with the magnet covering sub-parts 422 on both end faces of the rotor core 10.

The side filling part 44 can be further provided with a chip adsorption groove, the chip adsorption groove can be formed in the side filling part 44 along the axial extension of the rotor core 10, and the chip adsorption groove is used for absorbing small foreign matters adsorbed in the operation process of the rotor 100, so that the risk of friction generated when the rotor 100 and the stator rotate due to the fact that the foreign matters such as metal chips are adsorbed on the surface of the rotor 100 is reduced, and the improvement of the performance of the motor comprising the rotor 100 is facilitated.

The shaft hole filling part 46 is connected to the end surface covering part 42 and filled between the rotor shaft 30 and the inner wall of the shaft hole 120 to isolate and insulate the rotor core 10 from the rotor shaft 30 while fixing the rotor shaft 30 and the rotor core 10.

The plastic-coated member 40 is made of resin material, and is coated on the rotor core 10, the magnet 20 and the rotor shaft 30 by injection molding, and the plastic-coated member 40 is further filled in a gap between the magnet 20 and the shaft collar portion 12.

Further, the present application also provides an electric machine including the rotor 100 as described above.

In contrast to the state of the art, the present application discloses a rotor and a motor. Through making the package mould the piece and filling between the inner wall in rotor shaft and shaft hole to keep apart and insulating rotor core and rotor shaft, thereby can change the electrostatic capacity of rotor one side, make the electrostatic capacity of rotor one side easily reach the equilibrium with the electrostatic capacity of complex stator one side, and then can reduce the epaxial shaft voltage of rotor, reach the effect of improving bearing galvanic corrosion.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.

Claims (10)

1. A rotor, comprising:

the rotor core comprises a shaft ring part and a plurality of fan-shaped parts which are arranged around the shaft ring part at intervals, wherein a shaft hole is formed in the shaft ring part;

the rotor shaft is inserted into the shaft hole, and the diameter of the shaft hole is larger than the diameter of the rotor shaft;

and the plastic coating part is filled between the rotor shaft and the inner wall of the shaft hole.

2. The rotor of claim 1, wherein the rotor shaft comprises a shaft body and a shaft groove provided on the shaft body, an outer diameter of the shaft groove being smaller than an outer diameter of the shaft body; the shaft groove is located in the shaft hole, and the plastic wrapping part is filled between the shaft groove and the inner side wall of the shaft hole.

3. The rotor of claim 2, wherein the axial slot has a length in the axial direction that is greater than a length of the shaft hole in the axial direction.

4. The rotor according to claim 2, wherein a surface of the shaft groove is formed with a run-off preventing portion in a convex or concave manner.

5. The rotor of claim 1 further comprising a plurality of magnets, wherein a receiving slot is defined between two adjacent segments, each magnet being embedded in one of the receiving slots, the magnets protruding from the end surface of the rotor core.

6. The rotor of claim 5, wherein the overmold further encapsulates the magnet, the overmold comprising:

an end face covering portion covering the magnet of the end face of the rotor core and exposing the fan-shaped portion of the end face of the rotor core;

and the shaft hole filling part is connected with the end face covering part and is filled between the rotor shaft and the inner wall of the shaft hole.

7. The rotor of claim 6, wherein the plastic-coated member further comprises a side filling portion, the side filling portion is connected to the end face covering portion, covers the magnets on the side of the rotor core, and exposes the sectors on the side of the rotor core.

8. The rotor according to claim 6, wherein the sector portion is formed with a balance hole exposed to the end surface covering portion.

9. The rotor as claimed in claim 8, wherein the end surface covering portion includes a plurality of magnet covering subsections and a collar covering subsection, the plurality of magnet covering subsections being radially connected to the collar covering subsection; and a retainer ring is connected between the two adjacent magnet covering sub-parts and is positioned on the outer periphery of the fan-shaped part.

10. An electrical machine, characterized in that the electrical machine comprises a rotor according to any of claims 1-9.

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