CN216290388U

CN216290388U - Rotor and motor with same

Info

Publication number: CN216290388U
Application number: CN202122010972.7U
Authority: CN
Inventors: 周志亮
Original assignee: Moter Suzhou Co ltd
Current assignee: Moto Jiangsu Electric Drive Technology Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-04-12
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a rotor and a motor with the rotor, wherein the rotor comprises: a rotating shaft (20); the rotor frame (21) is connected with the rotating shaft (20), a plurality of grooves (210) are formed in the outer peripheral surface of the rotor frame (21), and each groove (210) comprises a first bottom surface (2100) and a second bottom surface (2101) which is obliquely arranged relative to the first bottom surface (2100); and the magnet (22) is arranged in the groove (210) and comprises a first surface (220) attached to the first bottom surface (2100) and a second surface (221) attached to the second bottom surface (2101). The rotor frame and the magnet have larger contact area, so that the connection between the rotor frame and the magnet is firmer, and the guide and the positioning of the magnet during installation are convenient.

Description

Rotor and motor with same

Technical Field

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

Background

An electric machine is a power plant that is common in the art and typically includes a stator and a rotor. In a brushless motor, a rotor generally includes a rotating shaft, a rotor frame connected to the rotating shaft, and a plurality of magnets connected to the rotor frame, and a stator includes a plurality of windings surrounding the rotor, and when the windings are energized, the windings can generate a changing magnetic field, so as to generate a driving force with the magnets to drive the rotor to rotate.

In the prior art, the outer peripheral surface of the rotor frame is generally in a circular arc shape, the magnet is generally in a tile shape, and the magnet is attached to the outer peripheral surface of the rotor frame in an adhesive connection mode; on the other hand, the existing magnet is tile-shaped, the whole thickness is uniform, the thickness of the magnet is limited by the space inside the motor, the magnetic field formed by the magnet is difficult to strengthen, and the torque of the motor is difficult to increase.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the rotor and the motor with the rotor, wherein the connection between the magnet in the rotor and the rotor frame is firmer.

To solve the above technical problem, in one aspect, the present invention provides a rotor, including:

a rotating shaft;

the rotor frame is connected with the rotating shaft, a plurality of grooves are formed in the peripheral surface of the rotor frame, and each groove comprises a first bottom surface and a second bottom surface which is obliquely arranged relative to the first bottom surface; and

and the magnet is arranged in the groove and comprises a first surface attached to the first bottom surface and a second surface attached to the second bottom surface.

Further, the magnet further comprises an arc surface connected between the first surface and the second surface, and the arc surface is convex in a direction away from the first surface and the second surface.

Furthermore, a tip part is formed between the first surface and the second surface, and an avoiding groove for accommodating the tip part is arranged between the first bottom surface and the second bottom surface.

Further, an included angle a between the first bottom surface and the second bottom surface is an obtuse angle.

Further, the included angle a is 135 °.

Further, the rotor frame comprises a plurality of heat dissipation holes formed along the axial direction of the rotor frame.

Furthermore, the heat dissipation holes are divided into two groups, four groups are provided, and the heat dissipation holes are uniformly distributed by taking the axis of the rotor frame as the center.

Furthermore, the rotor frame is provided with a plurality of positioning holes which are formed along the axis direction of the rotor frame, and the plurality of positioning holes are uniformly distributed by taking the axis of the rotor frame as the center.

Further, the rotor frame is provided with a center hole used for penetrating the rotating shaft, at least two ends of the center hole are provided with protruding portions protruding towards the inside, and the protruding portions are tightly matched with the rotating shaft.

In another aspect, the utility model also provides an electric machine comprising a rotor as described in any one of the above.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the groove for accommodating the magnet is arranged on the outer surface of the rotor frame, and comprises the first bottom surface and the second bottom surface which are obliquely arranged, so that the contact area with the magnet can be increased, the connection between the first bottom surface and the magnet is firmer, and the magnet is convenient to guide and position during installation; in addition, the magnet can be partially embedded in the rotor frame, so that the magnet with thicker thickness can be used, the magnetic field intensity of the magnet is improved, and the motor torque is further increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Wherein:

fig. 1 is a schematic view of the structure of the motor of the present invention.

Fig. 2 is a sectional view of the motor of the present invention.

Fig. 3 is a schematic view of the structure of the rotor in the present invention.

Fig. 4 is a schematic view showing the connection of the rotor frame and the magnet according to the present invention.

Fig. 5 is a schematic view of the structure of the stator in the present invention.

Fig. 6 is a schematic view of a stator core according to the present invention.

Fig. 7 is a schematic view of the structure of the stator frame in the present invention.

Fig. 8 is a sectional view of a stator in the present invention.

Fig. 9 is a schematic diagram of a circuit assembly according to the present invention.

Fig. 10 is a structural schematic diagram of another view direction of the motor in the utility model.

Fig. 11 is a schematic structural view of the wire-routing seat and the wire-pressing member in the present invention.

Fig. 12 is a schematic structural view of the wire-routing seat and the wire-pressing member of the present invention when they are separated.

Fig. 13 is a schematic view of the magnetic ring of the present invention mounted on the rotating shaft.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "comprising" and "having," as well as any variations thereof, in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

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 utility model. 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.

As shown in fig. 1 to 13, a motor according to a preferred embodiment of the present invention includes a housing assembly 1, a rotor 2, a stator 3, and a circuit assembly 4.

As shown in fig. 1 and 2, the housing assembly 1 includes a housing 10, a front cover 11 connected to one end of the housing 10, and a rear cover 12 connected to the other end of the housing 10. The housing 10 is hollow and tubular, and has a cavity 100 therein, and a front end cap 11 and a rear end cap 12 respectively seal two ends of the cavity 100.

As shown in fig. 3, the rotor 2 includes a rotation shaft 20, a rotor frame 21 fixedly coupled to the rotation shaft 20, and a plurality of magnets 22 fixedly coupled to the rotor frame 21.

The shaft 20 has one end rotatably connected to the rear cover 12 and the other end extending out of the front cover 11 for connection to a load. Bearings 23 are provided between the rotation shaft 20 and the front cover 11 and between the rotation shaft 20 and the rear cover 12 to make the rotation of the rotation shaft 20 smoother.

The rotor frame 21 and the magnet 22 are located inside the cavity 100. As shown in fig. 4, the rotor frame 21 is substantially in the shape of a gear, and the outer peripheral surface thereof is provided with a plurality of grooves 210 for accommodating the magnets 22, the magnets 22 can be fixedly mounted in the grooves 210 by gluing or the like, the number of the grooves 210 can be selected as appropriate, and in this embodiment, the number of the grooves 210 is 8.

Obviously, by providing the groove 210 on the outer circumferential surface of the rotor frame 21, the magnet 22 is partially embedded inside the rotor frame 21, so that the thickness of the magnet 22 can be increased without affecting the occupation of the magnet 22 on the external space, the magnetic field strength of the magnet 22 is increased, and the torque of the motor is increased.

Further, the plurality of grooves 210 are uniformly distributed on the periphery of the rotor frame 21 with the axis of the rotor frame 21 as the center, the cross sections of the grooves 210 are axisymmetric, and the symmetry plane 24 of each groove 210 passes through the axis of the rotor frame 21, and accordingly, the magnets 22 are also symmetric and are also symmetric with the symmetry plane 24 after being installed in the grooves 210. The angles between the symmetry planes 24 of two adjacent grooves 210 are the same, so that the magnetic poles of the magnets 22 are uniformly distributed.

The groove 210 includes a first bottom surface 2100 and a second bottom surface 2101, the first bottom surface 2100 and the second bottom surface 2101 are symmetrically disposed, and an included angle a is formed between the two bottom surfaces, the included angle a is preferably an obtuse angle, so that the magnet 22 has a larger width B, the space between two adjacent magnets is smaller, and the continuity between the magnetic poles is better. In a preferred embodiment, the included angle A is 135 degrees, such that the included angle C between the first bottom surface 2100 and the second bottom surface 2101 of the adjacent groove 210 is 90 degrees.

Accordingly, the magnet 22 includes a first surface 220 corresponding to the first bottom surface 2100 and a second surface 221 corresponding to the second bottom surface 2101, and an included angle D formed between the first surface 220 and the second surface 221 is the same as the included angle a, so that the first surface 220 and the second surface 221 can respectively fit with the first bottom surface 2100 and the second bottom surface 2101 when being installed. Obviously, by arranging the first bottom surface 2100 and the second bottom surface 2101, the attachment area of the magnet 22 and the rotor frame 21 can be increased, so that the magnet 22 is more firmly attached to the rotor frame 21 and is not easy to loosen, and the reliability and stability of the operation of the motor are ensured; meanwhile, the conical part of the magnet 22 can be guided by the two bottom surfaces when being installed in the groove 210, so that the magnet can be conveniently positioned in the groove 210 to complete installation.

The magnet 22 further includes an arc 223 connected between the first surface 220 and the second surface 221, the arc 223 being convex in a direction away from the first surface 220 and the second surface 221 so that the thickness of the magnet 22 can be further increased, and by controlling the curvature of the arc 223, the maximum thickness of the magnet 22 can be controlled, thereby controlling the magnetic force of the magnet 22. Since the magnet 22 is embedded in the rotor frame 21, the magnet 22 can be made thicker without affecting or not affecting the size of the rotor 2 too much, and the thickness of the magnet 22 can be increased in a limited space, thereby increasing the magnetic force thereof and increasing the rotational torque of the motor.

In order to prevent the interference of the magnet 22 during installation, a concave avoiding groove 2102 is formed between the first bottom surface 2100 and the second bottom surface 2101, when the magnet 22 is installed, a tip 222 formed between the first surface 220 and the second surface 221 is accommodated in the avoiding groove 2102, the requirement on machining precision can be reduced, and the magnet 22 and the groove 210 can be reliably attached; in addition, the escape groove 2102 can accommodate more glue, thereby improving the firmness of the connection of the magnet 22 and the rotor frame 21.

With reference to fig. 4, the rotor frame 21 is provided with a plurality of heat dissipation holes 212 extending along the axial direction of the rotor frame, and the heat dissipation holes 212 penetrate through the front and rear end surfaces of the rotor frame 21, so as to dissipate heat through the airflow flowing through the heat dissipation holes 212 when the rotor frame 21 rotates, thereby improving the heat dissipation effect. In this embodiment, the cross section of the heat dissipation holes 212 is circular, and two of the heat dissipation holes are used as one group, and four groups are provided, and the four groups of heat dissipation holes 212 are uniformly distributed around the axis of the rotor frame 21.

Rotor frame 21 adopts the silicon steel sheet to fold and presses and forms, a plurality of locating holes 213 that the position is the same have been seted up on every silicon steel sheet, when folding, fix a position through locating hole 213 and the reference column on the mould, thereby guarantee the position accuracy of silicon steel sheet, the rotor frame 21 quality of making is better, in this embodiment, locating hole 213's cross-section is the rectangle, its quantity is four, use the axis of rotor frame 21 as central evenly distributed, and every locating hole 213 all is located between two sets of adjacent louvres 212, it can be understood, locating hole 213 also has the radiating effect.

The rotor frame 21 includes a central hole 214 for inserting the rotating shaft 20, in order to facilitate the rotating shaft 20 to be inserted into the central hole 214 and improve the fastening force between the rotating shaft 20 and the rotor frame 21, protrusions 2140 protruding toward the inside are provided at both ends of the central hole 214, the number of the protrusions 2140 is not limited, and the protrusions 2140 shown in fig. 4 are three and are uniformly distributed (the axis of the central hole 214 is the axis of the rotor frame 21) centering on the axis of the central hole 214 and are tightly fitted to the rotating shaft 20. Because the contact area between the rotating shaft 20 and the inner surface of the central hole 214 is reduced by the arrangement of the protruding portion 2140, the rotating shaft 20 can be more conveniently penetrated, the requirement on the matching precision between the rotating shaft 20 and the rotor frame 21 is lower, and meanwhile, the protruding portion 2140 is tightly matched with the rotating shaft 20, so that the fastening force can be effectively improved, and the connection reliability is improved.

As shown in fig. 5, the stator 3 includes a stator core 30, a stator frame 31 connected to the stator core 30 by injection molding, and a plurality of windings 32 wound on the stator frame 31.

As shown in fig. 6 to 8, the stator core 30 includes an outer sleeve 300 attached to an inner wall of the housing 10, and a plurality of stator teeth 301 attached to the outer sleeve 300 and extending to an inside of the outer sleeve 300. The outer sleeve 300 is substantially annular, the stator teeth 301 include an extension portion 3010 connected to the outer sleeve 300 and a limiting plate portion 3011 disposed at one end of the extension portion 3010 close to the center of the outer sleeve 300, both sides of the limiting plate portion 3011 extend to beyond both sides of the stator teeth 301, the width of the limiting plate portion 3011 is greater than the width of the stator teeth 301, meanwhile, an inner end surface 3012 of the limiting plate portion 3011 facing the center of the outer sleeve 300 is an arc surface, and the arc surface is centered on the center of the outer sleeve 300, that is, disposed coaxially with the rotor 2, so that the shortest distance between the limiting plate portion and the magnet 22 is always the same, and the magnetic force is more balanced.

The stator core 30 is preferably formed by laminating silicon steel sheets, and heat dissipation holes or positioning holes may be formed therein for heat dissipation or positioning.

The stator frame 31 is used for connecting the stator core 30 and the winding 32, and includes an outer frame 310 connected to the outer sleeve 300 and a stator tooth sleeve 311 connected to the outer frame 310, and the winding 32 is wound on the stator tooth sleeve 311.

The outer frame 310 includes an outer surface 3100 to be attached to an inner surface 3000 of the outer tube 300, and in order to improve a connection strength between the outer frame and the outer frame, the outer surface 3100 of the outer frame 310 is provided with a protrusion 3101 extending in an axial direction of the outer frame 310, and accordingly, the inner surface 3000 of the outer tube 300 has a stopper groove 3001 to be fitted to the protrusion 3101, and circumferential looseness between the both can be prevented by fitting the stopper groove 3001 to the protrusion 3101.

Stator frame 31 is provided with coupling hole 312 extending from outer surface 3100 to stator teeth sleeve 311, stator teeth 301 are accommodated inside coupling hole 312, and inner end surface 3012 of limit plate portion 3011 is exposed to stator teeth sleeve 311 to reliably transmit magnetic force. As shown in fig. 7 and 8, the stator teeth sleeve 311 has a fixing cover 3110 for accommodating the limiting plate portion 3011, the fixing cover 3110 has a first end face 3111 facing the center of the stator frame 31, preferably, the first end face 3111 is an arc face having the same diameter as the inner end face 3012 so that the two faces are flush with each other, and the first end face 3111 is provided with a recessed groove 3112 communicating with the mating hole 312, so that the stator frame 31 can be prevented from shielding the outer edge of the inner end face 3012 during injection molding, and the inner end face 3012 can be more reliably exposed to the first end face 3111. Preferably, the recess 3112 is formed along the axial direction of the stator frame 31 and penetrates both ends of the fixed cover 3110.

As shown in fig. 9, the circuit assembly 4 includes a circuit board 40, and a cable 41 and a plug 42 both connected to the circuit board 40.

As shown in fig. 7 and 9, a plurality of sockets 313 are provided in the stator frame 31, the plug 42 corresponds to the positions of the sockets 313, and the circuit board 40 and the stator frame 31 can be fixed relative to each other by inserting the plug 42 into the sockets 313.

The cable 41 is connected to an external device (e.g., a motor driver) for supplying power and transmitting signals to control the start, stop, and rotation of the motor. The cable 41 generally includes a power supply cable for supplying power to the winding 32 and a control cable for transmitting a signal for control. As shown in fig. 10 and 11, the rear end cover 12 is provided with a wire routing seat 14 and a wire pressing member 15 connected to the wire routing seat 14, a wire routing hole 140 communicating the cavity 100 and the outside of the motor is formed between the wire routing seat 14 and the wire pressing member 15, and the wire routing seat 14 further includes a partition plate 141 extending into the cavity 100, the partition plate 141 separating the control cable and the power supply cable, so that the different types of cables 41 are arranged more neatly and are more convenient to distinguish and wire.

Preferably, the position between the wire pressing member 15 and the wire seat 14 is adjustable, so that the cable 41 can be pressed by reducing the height of the wire routing hole 140. As shown in fig. 12, as a preferred embodiment, the wire routing seat 14 is provided with two first tooth surfaces 142 oppositely arranged at two sides of the wire routing hole 140, the first tooth surfaces 142 are provided with inverted teeth, and two second tooth surfaces 150 matched with the first tooth surfaces 142 are arranged at two sides of the wire pressing member 15, the first tooth surfaces 142 allow the second tooth surfaces 150 to move towards the direction of reducing the height of the wire routing hole 140, but prevent the second tooth surfaces 150 from moving towards the opposite direction, so that the wire pressing member 15 can move on the wire routing seat 14 in a single direction.

As shown in fig. 2, 3 and 9, the circuit assembly 4 further includes a hall sensor 43 disposed on the circuit board 40 to detect rotation of the rotating shaft 20. Specifically, the circuit board 40 includes a ring portion 400 sleeved on the rotating shaft 20, the ring portion 400 is provided with at least one hall sensor 43 (3 in this embodiment), and a magnetic ring 5 is disposed at a position on the rotating shaft 20 corresponding to the ring portion 400, and can rotate along with the rotating shaft 20, so as to be sensed by the hall sensor 43, and information such as the rotating speed, the rotating angle, the number of turns of the rotating shaft 20 and the like can be calculated according to a sensing signal. In a preferred embodiment, the hall sensor 43 is exposed on the inner surface of the ring portion 400, so that it is closer to the magnetic ring 5, and the interference between the two is less, and the measured result is more accurate. The hall sensor 43 is electrically connected to the cable 41, and can transmit a signal through the cable.

Further preferably, as shown in fig. 3, a mounting sleeve 6 is connected in an inner hole of the magnetic ring 5, the mounting sleeve 6 is sleeved on the rotating shaft 20, and the mounting sleeve 6 is connected with the rotating shaft 20, so that the position of the magnetic ring 5 on the rotating shaft 20 can be adjusted by pushing the mounting sleeve 6 in the mounting process, and the magnetic ring 5 is prevented from being damaged due to direct contact with the magnetic ring 5 in the mounting process. The material of the mounting sleeve 6 is not limited, and as a preferred embodiment, the mounting sleeve 6 is a copper sleeve.

As shown in fig. 13, knurls 60 may be formed on the outer surface of the mounting sleeve 6, so that a larger friction force is generated between the magnetic ring 5 and the mounting sleeve 6, the magnetic ring 5 and the mounting sleeve 6 are prevented from being loosened, and the connection is more reliable.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A rotor, comprising:

a rotating shaft (20);

the rotor frame (21) is connected with the rotating shaft (20), a plurality of grooves (210) are formed in the outer peripheral surface of the rotor frame (21), and each groove (210) comprises a first bottom surface (2100) and a second bottom surface (2101) which is obliquely arranged relative to the first bottom surface (2100); and

and the magnet (22) is arranged in the groove (210) and comprises a first surface (220) attached to the first bottom surface (2100) and a second surface (221) attached to the second bottom surface (2101).

2. The rotor as recited in claim 1, characterized in that the magnet (22) further comprises a cambered surface (223) connected between the first surface (220) and the second surface (221), the cambered surface (223) being convex in a direction away from the first surface (220) and the second surface (221).

3. The rotor as recited in claim 1, characterized in that a tip portion (222) is formed between the first surface (220) and the second surface (221), and an escape groove (2102) accommodating the tip portion (222) is provided between the first bottom surface (2100) and the second bottom surface (2101).

4. The rotor as recited in claim 1, characterized in that an angle a between the first bottom surface (2100) and the second bottom surface (2101) is an obtuse angle.

5. The rotor of claim 4 wherein said included angle A is 135 °.

6. The rotor according to any of claims 1 to 5, characterized in that the rotor frame (21) comprises a plurality of heat dissipation holes (212) opened in the axial direction thereof.

7. The rotor according to claim 6, characterized in that the heat dissipation holes (212) are grouped into two groups, four groups in total, evenly distributed centering on the axis of the rotor frame (21).

8. The rotor according to any one of claims 1 to 5, wherein the rotor frame (21) is formed with a plurality of positioning holes (213) formed along an axial direction thereof, and the plurality of positioning holes (213) are uniformly distributed centering on the axis of the rotor frame (21).

9. The rotor according to any one of claims 1 to 5, wherein the rotor frame (21) is provided with a central hole (214) for passing the rotating shaft (20), at least two ends of the central hole (214) are provided with protrusions (2140) protruding inward, and the protrusions (2140) are tightly fitted with the rotating shaft (20).

10. An electrical machine comprising a rotor according to any one of claims 1 to 9.