CN219592256U - Outer rotor, motor and electrical equipment with outer rotor - Google Patents

Abstract

The utility model discloses an outer rotor, and a motor and electrical equipment with the outer rotor. The outer rotor includes: the magnetic conduction ring is annular; the permanent magnets are arranged on the radial inner side of the magnetic conducting ring, the permanent magnets comprise a plurality of permanent magnets, the plurality of permanent magnets are arranged at intervals along the axial direction of the magnetic conducting ring, and the height of the magnetic conducting ring is smaller than that of the permanent magnets in the axial direction of the outer rotor. According to the outer rotor, the magnetic ring and the permanent magnet are arranged, and the height of the magnetic ring is smaller than that of the permanent magnet, so that the motor has a good silencing effect in the running process, and the use experience of a user is greatly improved.

Description

Outer rotor, motor and electrical equipment with outer rotor

Technical Field

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

Background

In hot seasons, people can adopt various modes to cool down so as to obtain comfortable life or production states, and the air conditioner is favored by the masses as electric equipment with excellent refrigeration effect. The air conditioner generally uses the motor as a power source to output power for the operation of the air conditioner, but in the operation process of the air conditioner, the noise of the motor is larger, so that the use experience of people is greatly reduced.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model aims at providing the outer rotor which can realize the extreme silence during the operation of the motor and greatly improve the user experience.

The utility model further provides a motor with the outer rotor.

The utility model further provides electrical equipment with the motor.

An outer rotor according to a first aspect of the present utility model includes: the magnetic conduction ring is annular; the permanent magnets are arranged on the radial inner side of the magnetic conduction ring, the permanent magnets comprise a plurality of permanent magnets, the plurality of permanent magnets are arranged at intervals along the circumferential direction of the magnetic conduction ring, and the height of the magnetic conduction ring is smaller than that of the permanent magnets in the axial direction of the outer rotor.

According to the outer rotor, the magnetic ring and the permanent magnet are arranged, and the height of the magnetic ring is smaller than that of the permanent magnet, so that the motor has a good silencing effect in the running process, and the use experience of a user is greatly improved.

In addition, the outer rotor according to the utility model may have the following additional technical features:

in some embodiments of the present utility model, in the axial direction of the outer rotor, both ends of the permanent magnet exceed both ends of the magnetic conductive ring, and a height of a portion of either end of the permanent magnet exceeding the magnetic conductive ring is 0.7-0.9 times a thickness of the permanent magnet.

In some embodiments of the utility model, the permanent magnet has a chamfer between an end surface in an axial direction and a wall surface in a radial direction of the permanent magnet.

In one embodiment of the utility model, the chamfer is a right angle, the chamfer has a width of 3.5mm-5mm in the axial direction of the outer rotor and a width of 1mm-1.5mm in the radial direction.

In some embodiments of the utility model, the radially inner side wall surface of the permanent magnet comprises: the first cambered surface extends along the circumferential direction of the outer rotor and protrudes towards the direction of the magnetic conduction ring, and the permanent magnet is symmetrical about the perpendicular bisector of the first cambered surface; the second cambered surfaces are two and are respectively connected with two ends of the first cambered surface in the circumferential direction of the outer rotor, extend along the circumferential direction of the outer rotor and are protruded towards the direction of the central axis of the outer rotor; and the third cambered surfaces are two and are respectively connected between the two second cambered surfaces and two end surfaces of the permanent magnet in the circumferential direction of the outer rotor.

In one embodiment of the present utility model, a radius r1=1/5 (D-2T 1-2T 2) to 1/3 (D-2T 1-2T 2) of the second cambered surface, where D is an outer diameter of the magnetic conductive ring, T1 is a thickness of the permanent magnet, and T2 is a thickness of the magnetic conductive ring.

In some embodiments of the utility model, the permanent magnets have a thickness in a radial direction of the outer rotor of 4.5mm-5.5mm.

In some embodiments of the utility model, the thickness of the magnetic conductive ring is 2/5-3/5 of the thickness of the permanent magnet in the radial direction of the outer rotor.

In some embodiments of the utility model, the outer diameter of the magnetic conductive ring is 101mm-105mm.

In some embodiments of the present utility model, the magnetic ring is a magnetic tube, or the magnetic ring includes a plurality of magnetic sheets, and the plurality of magnetic sheets are stacked along an axial direction of the outer rotor.

The motor according to the second aspect of the present utility model includes the outer rotor according to the first aspect of the present utility model; the stator is arranged on the radial inner side of the outer rotor and comprises a stator core body, and the height of the stator core body is smaller than that of the permanent magnet in the axial direction of the outer rotor.

According to the motor provided by the utility model, through the arrangement of the outer rotor in the first aspect, and the arrangement of the magnetic ring and the permanent magnet, the height of the magnetic ring is smaller than that of the permanent magnet, so that the motor has a good silencing effect in the running process, and the use experience of a user is greatly improved.

In addition, the motor according to the utility model may have the following additional technical features:

in some embodiments of the utility model, the stator core comprises: stator yoke and stator tooth boots, the stator yoke is annular, the stator tooth boots include a plurality of, and a plurality of the stator tooth boots are in the circumference interval arrangement of stator yoke, the stator tooth boots include stator tooth portion and stator boot, the stator tooth portion is followed the radial extension of stator yoke and one end with the stator yoke links to each other, the stator boot is connected the other end of stator tooth portion, the stator boot is followed the circumference extension of stator yoke.

In one embodiment of the utility model, the width of the stator tooth part in the circumferential direction of the stator is 1/20-1/15 of the outer diameter of the magnetic conductive ring.

In one embodiment of the utility model, the ratio of the thickness of the stator shoe in the radial direction of the stator to the width of the stator tooth is 1/2-2/3.

In one embodiment of the utility model, the minimum spacing between two adjacent stator shoes in the circumferential direction of the stator is 2mm-3mm.

In one embodiment of the utility model, a side surface of the stator shoe facing away from the stator tooth comprises: a first arc segment extending circumferentially of the stator, the stator shoe being symmetrical about a perpendicular bisector of the first arc segment; the second arc sections comprise two, and the two second arc sections are respectively connected to two sides of the first arc section in the circumferential direction of the stator.

In some examples of the utility model, the corresponding central angle a of the first arc segment satisfies: 1/6 (360 DEG/Z) a is more than or equal to 1/4 (360 DEG/Z), wherein Z is the number of stator teeth shoes.

In some examples of the present utility model, the first arc segment is tangent to the second arc segment at a connection location, and a radius r2=1/6 (D-2T 1-2T 2) to 1/4 (D-2T 1-2T 2) of the second arc segment, where D is an outer diameter of the magnetic conductive ring, T1 is a thickness of the permanent magnet, and T2 is a thickness of the magnetic conductive ring.

An electrical device according to a third aspect of the utility model comprises an electrical machine according to the second aspect of the utility model.

According to the electrical equipment disclosed by the utility model, by arranging the motor in the second aspect and arranging the magnetic conducting ring and the permanent magnet, the height of the magnetic conducting ring is smaller than that of the permanent magnet, so that the motor has a good silencing effect in the operation process, and the use experience of a user is greatly improved.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

FIG. 1 is a schematic diagram of an electric machine according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the outer rotor and stator core shown in FIG. 1;

fig. 3 is a cross-sectional view of the outer rotor and stator core shown in fig. 2;

FIG. 4 is a schematic view of the permanent magnet shown in FIG. 2;

FIG. 5 is a schematic view of another angle of the permanent magnet shown in FIG. 2;

fig. 6 is a schematic view of the stator tooth shoe shown in fig. 2.

Reference numerals:

10. an outer rotor; 11. a magnetic conductive ring; 12. a permanent magnet; 121. a first cambered surface; 122. a second cambered surface; 123. a third cambered surface; 20. a stator; 21. a stator core; 211. a stator yoke; 212. stator tooth shoes; 22. an injection molding; 201. stator tooth parts; 202. a stator shoe; 203. a first arc segment; 204. a second arc segment;

100. and a motor.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

First, a motor 100 according to an embodiment of the second aspect of the present utility model will be briefly described with reference to fig. 1 to 6. The motor 100 includes the outer rotor 10 and the stator 20 according to the embodiment of the first aspect of the present utility model, the stator has the stator tooth 201 for winding the winding, the stator 20 is disposed at the radial inner side of the outer rotor 10, the outer rotor 10 cooperates with the stator 20, the motor 100 rotates the outer rotor 10 around the axis of the stator 20 by using the principle that the energizing conductor receives force in the magnetic field, thereby outputting the rotation torque to the outside.

An outer rotor 10 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 6.

As shown in fig. 1 to 6, an outer rotor 10 according to an embodiment of the first aspect of the present utility model includes: a magnetic conductive ring 11 and a permanent magnet 12. Specifically, the magnetic ring 11 is annular; the permanent magnets 12 are arranged radially inside the magnetically permeable ring 11, the permanent magnets 12 include a plurality of permanent magnets 12 arranged at intervals along the circumferential direction of the magnetically permeable ring 11, and the magnetically permeable ring 11 has a height smaller than the height of the permanent magnets 12 in the axial direction of the outer rotor 10. For example, as shown in fig. 3, the height of the magnetic conductive ring 11 is H1, and the height of the permanent magnet 12 is H2, H1< H2.

According to the outer rotor 10 provided by the embodiment of the utility model, the magnetic conducting ring 11 and the permanent magnet 12 are arranged, and the height of the magnetic conducting ring 11 is smaller than that of the permanent magnet 12, so that the magnetic circuit magnetic resistance of the part of the end part of the permanent magnet 12 higher than the magnetic conducting ring 11 is increased, the magnetic flux is reduced, the influence of the magnetic field of the end part of the permanent magnet 12 on the magnetic saturation degree of the stator teeth is further reduced, the cogging torque is reduced, the good silencing effect is achieved, and the use experience of a user is greatly improved. It can be understood that the magnetic resistance of the magnetic conducting ring 11 is smaller, the magnetic flux of the permanent magnet 12 is easy to circulate, the magnetic resistance of the air is larger, and the magnetic flux of the permanent magnet 12 is difficult to circulate, so that the magnetic flux at the magnetic conducting ring 11 is larger, and the magnetic flux of the permanent magnet 12 higher than the magnetic conducting ring 11 is smaller between the outer rotor 10 and the stator 20. The stator tooth magnetic saturation is a state in which the magnetic induction intensity at the stator tooth 201 of the stator 20 is no longer increased with an increase in current, and the decrease in the magnetic flux at the end of the permanent magnet 12 decreases the magnetic flux entering the stator tooth 201, thereby decreasing the magnetic induction intensity of the stator tooth 201.

The cogging torque is a torque generated by interaction between the permanent magnet 12 and the stator core 21 when the motor 100 is not energized, and has periodic torque ripple that causes additional torque ripple to generate noise. The reduction of the magnetic flux at the end of the permanent magnet 12 reduces the magnetic induction intensity flowing to the stator core 21, so that the interaction intensity between the permanent magnet 12 and the stator core 21 is reduced, the cogging torque is reduced, the torque fluctuation caused by the cogging torque is weakened, and the motor 100 has a good silencing effect in the use process.

According to the outer rotor 10 provided by the embodiment of the utility model, the magnetic conducting ring 11 and the permanent magnet 12 are arranged, and the height of the magnetic conducting ring 11 is smaller than that of the permanent magnet 12, so that the motor 100 has a good silencing effect in the running process, and the use experience of a user is greatly improved.

In addition, the outer rotor 10 according to the present utility model may have the following additional technical features:

in some embodiments of the present utility model, as shown with reference to fig. 3, both ends of the permanent magnet 12 may exceed both ends of the magnetic conductive ring 11 in the axial direction of the outer rotor 10, and the height of a portion of either end of the permanent magnet 12 exceeding the magnetic conductive ring 11 may be 0.7-0.9 times the thickness of the permanent magnet 12. Therefore, by limiting the height of the permanent magnet 12 beyond the magnetic conductive ring 11, the part of the permanent magnet 12 beyond the magnetic conductive ring 11 can not be too much, so that the permanent magnet 12 is ensured to have higher magnetic flux, the electromagnetic conversion performance of the motor 100 is kept in a higher state, and the good performance of the motor 100 is maintained; meanwhile, the height of the permanent magnet 12 beyond the magnetic conductive ring 11 is enough, so that the motor 100 has a good silencing effect. For example, the height of the portion of the permanent magnet 12 at either end thereof beyond the magnetically conductive ring 11 may be 0.7 times, 0.8 times, or 0.9 times the thickness of the permanent magnet 12, etc., and the specific ratio may be appropriately selected according to the actual silencing effect and the performance of the motor 100.

In some embodiments of the present utility model, as shown in fig. 3, the permanent magnet 12 may have a chamfer between an end surface in the axial direction and a wall surface of the permanent magnet 12 in the radial direction. For example, as shown in fig. 3, the included angle a is a chamfer angle between the end surface of the permanent magnet 12 in the axial direction and the radial wall surface of the permanent magnet 12. Thereby, the thickness of the two end portions of the permanent magnet 12 is reduced after chamfering, so that the magnetic flux at the end portions of the permanent magnet 12 is reduced, thereby further reducing the cogging torque and improving the silencing effect of the motor 100.

In one embodiment of the present utility model, referring to fig. 4, the chamfer may be a right angle, the chamfer having a width of 3.5mm-5mm in the axial direction of the outer rotor 10 and a width of 1mm-1.5mm in the radial direction. Therefore, the thickness of the part of the permanent magnet 12 higher than the magnetic conductive ring 11 can be gradually reduced from the middle part of the permanent magnet 12 to the two ends along the axial direction, so that the change of the magnetic induction intensity of the permanent magnet 12 along the axial direction is uniform, the permanent magnet 12 can provide a good magnetic field environment, and the motor 100 can operate well. For example, the width of the chamfer in the axial direction of the outer rotor 10 may be 3.5mm, the width of the chamfer in the radial direction may be 1mm, and the specific dimension values of the chamfer in the axial and radial directions of the outer rotor 10 may be reasonably selected according to practical effects.

In some embodiments of the present utility model, as shown in fig. 5, the radially inner side wall surface of the permanent magnet 12 may include: the first arc surface 121, the second arc surface 122 and the third arc surface 123, the first arc surface 121 extends along the circumferential direction of the outer rotor 10 and protrudes towards the direction of the magnetic conducting ring 11, and the permanent magnet 12 is symmetrical about the perpendicular bisector of the first arc surface 121; the second cambered surfaces 122 are two and are respectively connected to two ends of the first cambered surface 121 in the circumferential direction of the outer rotor 10, and the second cambered surfaces 122 extend along the circumferential direction of the outer rotor 10 and are protruded towards the direction of the central axis of the outer rotor 10; the third cambered surfaces 123 are two and are respectively connected between the two second cambered surfaces 122 and the two end surfaces of the permanent magnet 12 in the circumferential direction of the outer rotor 10.

It can be understood that the stator 20 of the motor 100 is disposed on the inner side of the outer rotor 10, the radially inner side wall surface of the permanent magnet 12 is designed into a multi-segment arc form, and when the outer rotor 10 rotates, the permanent magnet 12 can avoid the inner side stator 20, so that the motor 100 can run more smoothly, and meanwhile, the inner side wall surface of the permanent magnet 12 is configured into a multi-segment arc surface structure, so that the magnetic flux of the permanent magnet 12 can be better gathered along the radial direction towards the perpendicular bisector of the first arc surface 121 on the inner side of the permanent magnet 12, thereby improving the magnetic field and magnetic density state of the permanent magnet 12, and improving the performance of the motor 100 to a certain extent. Preferably, the radially inner side wall surface of the permanent magnet 12 may be designed to be composed of only the first arc surface 121 and the second arc surface 122, or may be designed to be composed of only the first arc surface 121.

In one embodiment of the present utility model, referring to fig. 5, the radius r1=1/5 (D-2T 1-2T 2) to 1/3 (D-2T 1-2T 2) of the second cambered surface 122 is shown, where D is the outer diameter of the magnetically conductive ring 11, T1 is the thickness of the permanent magnet 12, and T2 is the thickness of the magnetically conductive ring 11. Therefore, the radius of the second cambered surface 122 is limited, so that the structural size and shape change of the inner side wall surface of the permanent magnet 12 formed by the second cambered surface 122, the first cambered surface 121 and the third cambered surface 123 of the permanent magnet 12 can be in a reasonable range, and the performance of the motor 100 can be better improved. For example, the radius R1 of the second cambered surface 122 may be 1/5 (D-2T 1-2T 2), the radius R1 of the second cambered surface 122 may also be 1/4 (D-2T 1-2T 2), and the specific value of the radius of the second cambered surface 122 may be a reasonable value according to the actual effect.

In some embodiments of the present utility model, referring to fig. 3, the permanent magnets 12 may have a thickness of 4.5mm-5.5mm in the radial direction of the outer rotor 10. Therefore, the thickness of the permanent magnet 12 in the radial direction of the outer rotor 10 is limited, so that the motor 100 can maintain good performance, the condition that the stator teeth of the motor 100 are saturated due to the fact that the thickness of the permanent magnet 12 is too large is avoided, and good operation conditions of the motor 100 are maintained. For example, the thickness of the permanent magnet 12 in the radial direction of the outer rotor 10 may be 4.5mm, 5mm, 5.5mm, etc., and the specific value of the thickness of the permanent magnet 12 in the radial direction of the outer rotor 10 may be set reasonably according to practical situations.

In some embodiments of the present utility model, referring to fig. 3, the thickness of the magnetically permeable ring 11 may be 2/5-3/5 of the thickness of the permanent magnet 12 in the radial direction of the outer rotor 10. Therefore, the thickness of the magnetic conduction ring 11 in the radial direction of the outer rotor 10 is limited, so that the thickness of the magnetic conduction ring 11 can be in an optimal range, and a good magnetic conduction effect and an effect can be achieved for the permanent magnet 12 in the motor 100 of the outer rotor 10, and the motor 100 can achieve optimal electric performance. For example, the radial thickness of the magnetic conducting ring 11 at the outer rotor 10 can be set to be 2/5 of the thickness of the permanent magnet 12, the thickness of the magnetic conducting ring 11 can also be set to be 1/2 of the thickness of the permanent magnet 12, and the thickness of the magnetic conducting ring 11 can be selected to be the optimal value according to the actual magnetic conducting effect.

In some embodiments of the present utility model, referring to fig. 3, the outer diameter of the magnetic conductive ring 11 may be 101mm-105mm. Therefore, the outer diameter of the magnetic ring 11 is limited, and the outer diameter of the outer rotor 10 can be limited to a certain extent, so that the whole structure size of the motor 100 meets the design and manufacturing requirements, and the small size of the motor 100 is maintained. For example, the outer diameter of the magnetic conduction ring 11 can be 101mm, 102mm, 103mm and the like, and the specific value of the outer diameter of the magnetic conduction ring 11 can be reasonably set according to actual design and processing requirements.

In some embodiments of the present utility model, as shown in fig. 2, the magnetic ring 11 may be a magnetic pipe, or the magnetic ring 11 includes a plurality of magnetic sheets, which are stacked in the axial direction of the outer rotor 10. That is, the magnetic conducting ring 11 may be a single magnetic conducting tube structure, the height of the magnetic conducting tube along the axial direction of the outer rotor 10 is the height of the magnetic conducting ring 11 along the axial direction of the outer rotor 10, the tube wall thickness of the magnetic conducting tube is the thickness of the magnetic conducting ring 11 along the radial direction of the outer rotor 10, the tube inner side wall surface of the magnetic conducting tube is abutted with the outer side wall surface of the plurality of permanent magnets 12 along the radial direction of the outer rotor 10, and the magnetic conducting ring 11 has a simple structure and is convenient to process and manufacture; the magnetic conductive ring 11 can also be formed by a plurality of magnetic conductive sheets, the magnetic conductive sheets are annular sheets, the magnetic conductive sheets are stacked along the thickness direction of the magnetic conductive sheets to form the axial height of the magnetic conductive ring 11 along the outer rotor 10, and the annular wall thickness of the magnetic conductive ring 11 is the radial thickness of the magnetic conductive ring 11 along the outer rotor 10, so that the magnetic conductive ring 11 can be flexibly adjusted according to actual needs during assembly, and the magnetic conductive ring is convenient to assemble. Preferably, the magnetic ring 11 may be formed by winding a strip steel plate into a ring shape, the magnetic ring 11 may be formed by directly cutting a steel pipe, and the magnetic ring 11 may be formed by laminating or winding silicon steel sheets.

An electric machine 100 according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 1 to 6.

As shown in fig. 1 to 6, an electric motor 100 according to an embodiment of the present utility model includes an outer rotor 10 and a stator 20 according to an embodiment of the first aspect of the present utility model. Specifically, the stator 20 is provided radially inside the outer rotor 10, the stator 20 includes a stator core 21, and the height of the stator core 21 is smaller than the height of the permanent magnets 12 in the axial direction of the outer rotor 10. It can be appreciated that when the motor 100 is assembled, a controller is required to be arranged on the stator core 21 to monitor and control the operation of the motor 100 in real time and to sense and position the position of the external rotor 10, the height of the stator core 21 is set to be smaller than that of the permanent magnet 12, enough space can be reserved for the installation and fixation of the controller, and meanwhile, the part of the permanent magnet 12 higher than the stator core 21 can meet the distance requirement of Hall induction of a control board, so that the motor 100 can use a Hall sensor to realize the electric control requirement of the rotor, and the electric control cost of the motor 100 is lower.

According to the motor 100 of the embodiment of the utility model, by arranging the outer rotor 10 according to the embodiment of the first aspect of the utility model, and by arranging the magnetic conductive ring 11 and the permanent magnet 12, the height of the magnetic conductive ring 11 is smaller than that of the permanent magnet 12, so that the motor 100 has a good silencing effect in the running process, and the use experience of a user is greatly improved.

In some embodiments of the present utility model, as shown in fig. 2, the stator core 21 may include: the stator yoke 211 and the stator tooth shoes 212, the stator yoke 211 is annular, the stator tooth shoes 212 comprise a plurality of stator tooth shoes 212, the plurality of stator tooth shoes 212 are arranged at intervals in the circumferential direction of the stator yoke 211, the stator tooth shoes 212 comprise stator tooth parts 201 and stator shoe parts 202, the stator tooth parts 201 extend along the radial direction of the stator yoke 211, one end of each stator tooth part is connected with the stator yoke 211, the stator shoe parts 202 are connected with the other end of each stator tooth part 201, and the stator shoe parts 202 extend along the circumferential direction of the stator yoke 211. Thereby, the structure is simple, and the winding is convenient to fix on the stator core 21.

In one embodiment of the present utility model, referring to fig. 2, the stator tooth 201 may have a width of 1/20-1/15 of the outer diameter of the magnetic ring 11 in the circumferential direction of the stator 20. Therefore, the width of the stator tooth 201 in the circumferential direction of the stator 20 is limited, so that the custom tooth has good structural strength, and meets the fixing requirement of the stator winding, meanwhile, a plurality of stator tooth shoes 212 are arranged along the circumferential direction of the stator yoke 211, winding fixing spaces of windings are formed between two adjacent stator tooth shoes 212, and the width of the stator tooth 201 in the circumferential direction of the stator 20 is limited, so that the stator core 21 has enough winding fixing spaces to perform winding installation and winding, and thus, the manufacturing design requirement of the motor 100 is met. For example, the width of the stator tooth 201 in the circumferential direction of the stator may be 1/20, 1/15, etc. of the outer diameter of the magnetic conductive ring 11, and the width of the stator tooth 201 in the circumferential direction of the stator 20 may be reasonably set according to the actual design and manufacturing requirements of the motor 100.

In one embodiment of the utility model, as shown with reference to FIG. 2, the ratio of the thickness of the stator shoes 202 in the radial direction of the stator to the width of the stator teeth 201 may be 1/2-2/3. Therefore, the thickness of the stator shoe 202 in the radial direction of the stator is limited, so that the stator shoe 202 has high structural strength, and the stator winding plays a good role in limiting and fixing when being wound between the stator shoe 202 and the stator yoke 211. For example, the ratio of the thickness of the stator shoe 202 in the radial direction of the stator 20 to the width of the stator tooth 201 may be 1/2, 2/3, etc., and the specific ratio may be appropriately set according to actual design and manufacturing requirements.

In one embodiment of the present utility model, referring to fig. 2, the minimum spacing between two adjacent stator shoes 202 in the circumferential direction of the stator 20 may be 2mm-3mm. Thus, by defining the minimum pitch of adjacent stator shoes 202 in the circumferential direction of the stator 20, the cogging torque can be kept low, thereby facilitating the silencing of the motor 100, while ensuring that adjacent two stator shoes 202 have a sufficient pitch in the circumferential direction of the stator 20, so that the stator winding can be smoothly wound. For example, the minimum pitch between two adjacent stator shoes 202 in the circumferential direction of the stator 20 may be 2mm, 2.5mm, 3mm, etc., and the minimum pitch may be set appropriately according to the actual manufacturing process.

In one embodiment of the present utility model, as shown in fig. 6, a side surface of the stator shoe 202 facing away from the stator tooth 201 may include: a first arc 203 and a second arc 204. The first arc segment 203 extends along the circumferential direction of the stator, and the stator yoke 211 is symmetrical about a perpendicular bisector of the first arc segment 203; the second arc segments 204 include two, and the two second arc segments 204 are respectively connected to both sides of the first arc segment 203 in the circumferential direction of the stator 20. Preferably, a surface of a side of the stator shoe 202 facing away from the stator tooth 201 may be provided with only the first arc segment 203, or may be provided with the first arc segment 203, the second arc segment 204 and the third arc segments, where the third arc segments are provided with two third arc segments respectively connected to sides of the two second arc segments 204 facing away from the first arc segment 203.

The side surface of the stator shoe 202 facing away from the stator tooth 201 may include: the first arc section 203 and the second arc section 204, that is, the surface of one side of the stator shoe 202 facing the permanent magnet 12 includes the first arc section 203 and the second arc section 204, and the multi-segment arc form can make the outer rotor 10 operate to avoid the permanent magnet 12, so that the motor 100 operates more smoothly, and meanwhile, the multi-segment arc structural form of the stator shoe 202 can make the magnetic flux of the permanent magnet 12 gather along the stator tooth shoe 212 of the stator core 21 toward the stator yoke 211 better, so that the magnetic field and the magnetic density state of the permanent magnet 12 on the stator core 21 can be improved, and the performance of the motor 100 is improved to a certain extent. The gap formed between the stator shoe 202 and the permanent magnet 12 is the air gap of the motor 100, the inner side surface of the permanent magnet 12 is designed to be in a multi-segment arc form, and the side surface of the stator shoe 202 facing the permanent magnet 12 is designed to be in a multi-segment arc form, so that the structure of the air gap can be improved, the magnetic field formed by the permanent magnet 12 and the stator winding in the air gap is more sinusoidal, the air gap magnetic field is promoted to gather towards the central axis of the permanent magnet 12 and the stator tooth shoe 212 in the radial direction of the outer rotor 10, the content of counter potential harmonic waves on the stator 20 is reduced to a certain extent, the noise of the motor 100 during operation is further reduced, and the effect of extreme silence is achieved.

It should be noted that, the counter electromotive force harmonic wave is a harmonic electromotive force induced by a flux density harmonic wave generated by a harmonic wave in an air gap magnetomotive force, the magnitude of the counter electromotive force harmonic wave is related to flux guide uniformity of an air gap, and the counter electromotive force harmonic wave can cause fluctuation of a magnetic field so as to generate noise when the motor 100 operates, and by setting a wall surface of an air gap side of the permanent magnet 12 and a surface of an air gap side of the stator boot 202 in a multi-segment arc form, flux guide in the air gap can be more uniform, thereby reducing the counter electromotive force harmonic wave and further improving a silencing effect of the motor 100.

In some examples of the utility model, referring to fig. 2 and 6, the corresponding central angle a of the first arc segment 203 may satisfy: 1/6 (360/Z). Ltoreq.a.ltoreq.1/4 (360/Z), where Z is the number of stator teeth shoes 212. Therefore, by limiting the central angle of the first arc segment 203, the surface structure design of the air gap side of the stator boot 202 can be better beneficial to the uniformity of the air gap flux guide, thereby being beneficial to the silencing purpose of the motor 100. For example, the corresponding central angle a of the first arc segment 203 may be 1/6 (360 °/Z), 1/4 (360 °/Z), etc., and the specific value of the central angle a may be set reasonably according to the actual effect and design and manufacturing requirements.

In some examples of the present utility model, referring to fig. 2 and 6, the first arc segment 203 and the second arc segment 204 may be tangential at the connection position, and the radius r2=1/6 (D-2T 1-2T 2) to 1/4 (D-2T 1-2T 2) of the second arc segment 204, where D is the outer diameter of the magnetic conductive ring 11, T1 is the thickness of the permanent magnet 12, and T2 is the thickness of the magnetic conductive ring 11. Therefore, the first arc section 203 and the second arc section 204 are tangent at the connecting position, so that the surface structure of the air gap side of the stator boot 202 is smoother, the uniformity of the air gap flux guide is facilitated, and the silencing purpose of the motor 100 is facilitated. The radius of the second arc segment 204 is limited, so that the surface structure of the air gap side of the stator shoe 202 and the surface structure of the air gap side of the permanent magnet 12 can be matched to form a good air gap structure, thereby being beneficial to the uniformity of air gap flux guide and improving the silencing effect of the motor 100.

In some embodiments of the present utility model, referring to FIG. 2, the inner diameter of the stator yoke 211 is 26mm-33mm. Thus, the inner diameter of the stator yoke 211 is defined, so that the phase stator teeth shoes 212 can be positioned close to the stator yoke 211 in the circumferential direction of the stator yoke 211, and the space between adjacent stator teeth shoes 212 meets the winding requirement of the stator winding, thereby facilitating the processing and assembly of the motor 100. For example, the inner diameter of the stator yoke 211 may be 26mm, 27mm, 28mm, etc., and the inner diameter of the stator yoke 211 may be appropriately set according to actual production and assembly requirements.

In some embodiments of the present utility model, as shown in fig. 1, the stator 20 may further include an injection molding member 22, where the injection molding member 22 is sleeved on the stator core 21. Therefore, the winding wound on the stator core 21 can be insulated, so that the motor 100 can maintain good operation conditions, and the motor has a simple structure and good insulation effect.

An electrical device according to an embodiment of the third aspect of the present utility model is described below with reference to fig. 1 to 6.

As shown in fig. 1 to 6, an electrical device according to an embodiment of the present utility model includes a motor 100 according to an embodiment of the second aspect of the present utility model.

Other constructions and operations of the electrical device according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

According to the electrical equipment provided by the embodiment of the utility model, by arranging the motor 100 according to the second aspect of the embodiment of the utility model and arranging the magnetic conductive ring 11 and the permanent magnet 12, the height of the magnetic conductive ring 11 is smaller than that of the permanent magnet 12, so that the motor 100 has a good silencing effect in the running process, and the use experience of a user is greatly improved.

An electric machine 100 according to an embodiment of the present utility model will be described below with reference to fig. 1-6.

As shown in fig. 1 to 6, the motor 100 includes an outer rotor 10 and a stator 20, and the stator 20 is provided radially inward of the outer rotor 10.

The outer rotor 10 comprises a magnetic conducting ring 11 and permanent magnets 12, the permanent magnets 12 comprise a plurality of permanent magnets 12 which are distributed at intervals along the circumferential direction of the magnetic conducting ring 11, the height of the magnetic conducting ring 11 in the axial direction of the outer rotor 10 is smaller than the height of the permanent magnets 12, and the lengths of the permanent magnets 12 which axially exceed the two ends of the magnetic conducting ring 11 along the outer rotor 10 are the same. The permanent magnet 12 has a chamfer between its axial end surfaces and radial wall surfaces, the chamfer being at right angles. The radial inner side wall surface of the permanent magnet 12 comprises a first cambered surface 121, a second cambered surface 122 and a third cambered surface 123, wherein the first cambered surface 121 protrudes towards the magnetic conduction ring 11, the second cambered surfaces 122 are two and are respectively connected with two ends of the first cambered surface 121 in the circumferential direction of the outer rotor 10, the third cambered surfaces 123 are two and are respectively connected with two ends of the second cambered surfaces 122 in the circumferential direction of the outer rotor 10, the permanent magnet 12 is connected with two ends of the permanent magnet 12 in the circumferential direction of the outer rotor 10, and the permanent magnet 12 is symmetrical about a perpendicular bisector of the first cambered surface 121.

According to the outer rotor 10 of the embodiment of the utility model, by arranging the magnetic conducting ring 11 and the permanent magnet 12, and the height of the magnetic conducting ring 11 is smaller than that of the permanent magnet 12, the magnetic flux at the end part of the permanent magnet 12 is reduced, and the magnetic induction intensity flowing to the stator core 21 is further reduced, so that the interaction intensity between the permanent magnet 12 and the stator core 21 is reduced, the cogging torque is reduced, and the torque fluctuation caused by the cogging torque is weakened, so that the motor 100 has a good silencing effect in the use process, and the use experience of a user is greatly improved.

The stator 20 includes a stator core 21 and an injection molding 22, and the injection molding 22 is wrapped on the stator core 21. The stator core 21 includes a stator yoke 211 and a plurality of stator teeth shoes 212, and the plurality of stator teeth shoes 212 are arranged at intervals along the circumferential direction of the stator yoke 211. The stator tooth shoes 212 include a stator tooth 201 and a stator shoe 202, one end of the stator tooth 201 being connected to the stator yoke 211 and the other end being connected to the stator tooth shoes 212. The side surface of the stator shoe 202, which is far from the stator tooth 201, comprises a first arc segment 203 and a second arc segment 204, wherein the first arc segment 203 extends along the circumferential direction of the stator, the second arc segment 204 comprises two parts and is respectively connected with two ends of the first arc segment 203 in the circumferential direction of the stator, and the stator tooth shoe 212 is symmetrical about the perpendicular bisector of the first arc segment 203.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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

Claims (19)

1. An outer rotor, comprising:

the magnetic conduction ring is annular;

the permanent magnets are arranged on the radial inner side of the magnetic conduction ring, the permanent magnets comprise a plurality of permanent magnets, the plurality of permanent magnets are arranged at intervals along the circumferential direction of the magnetic conduction ring, and the height of the magnetic conduction ring is smaller than that of the permanent magnets in the axial direction of the outer rotor.

2. The outer rotor according to claim 1, wherein both ends of the permanent magnet exceed both ends of the magnetically permeable ring in an axial direction of the outer rotor, and a height of a portion of either end of the permanent magnet exceeding the magnetically permeable ring is 0.7-0.9 times a thickness of the permanent magnet.

3. The outer rotor according to claim 1, wherein the permanent magnets have chamfers between end surfaces in an axial direction and wall surfaces in a radial direction of the permanent magnets.

4. An outer rotor according to claim 3, wherein the chamfer is a right angle, the chamfer having a width in the axial direction of the outer rotor of 3.5mm-5mm and a width in the radial direction of 1mm-1.5mm.

5. The outer rotor of claim 1, wherein the radially inner side wall surface of the permanent magnet comprises:

the first cambered surface extends along the circumferential direction of the outer rotor and protrudes towards the direction of the magnetic conduction ring, and the permanent magnet is symmetrical about the perpendicular bisector of the first cambered surface;

the second cambered surfaces are two and are respectively connected with two ends of the first cambered surface in the circumferential direction of the outer rotor, extend along the circumferential direction of the outer rotor and are protruded towards the direction of the central axis of the outer rotor;

and the third cambered surfaces are two and are respectively connected between the two second cambered surfaces and two end surfaces of the permanent magnet in the circumferential direction of the outer rotor.

6. The outer rotor of claim 5, wherein the radius r1=1/5 (D-2T 1-2T 2) to 1/3 (D-2T 1-2T 2) of the second cambered surface, wherein D is an outer diameter of the magnetic conductive ring, T1 is a thickness of the permanent magnet, and T2 is a thickness of the magnetic conductive ring.

7. The outer rotor according to claim 1, characterized in that the thickness of the permanent magnets in the radial direction of the outer rotor is 4.5mm-5.5mm.

8. The outer rotor according to any one of claims 1 to 7, characterized in that the thickness of the magnetic conductive ring is 2/5-3/5 of the thickness of the permanent magnet in the radial direction of the outer rotor.

9. The outer rotor according to any one of claims 1 to 7, wherein the outer diameter of the magnetic conductive ring is 101mm to 105mm.

10. The outer rotor according to any one of claims 1 to 7, wherein the magnetically permeable ring is a magnetically permeable tube, or the magnetically permeable ring includes a plurality of magnetically permeable sheets, the plurality of magnetically permeable sheets being arranged in a stacked manner along an axial direction of the outer rotor.

11. An electric machine, comprising:

the outer rotor according to any one of claims 1-10;

the stator is arranged on the radial inner side of the outer rotor and comprises a stator core body, and the height of the stator core body is smaller than that of the permanent magnet in the axial direction of the outer rotor.

12. The electric machine of claim 11, wherein the stator core comprises: stator yoke and stator tooth boots, the stator yoke is annular, the stator tooth boots include a plurality of, and a plurality of the stator tooth boots are in the circumference interval arrangement of stator yoke, the stator tooth boots include stator tooth portion and stator boot, the stator tooth portion is followed the radial extension of stator yoke and one end with the stator yoke links to each other, the stator boot is connected the other end of stator tooth portion, the stator boot is followed the circumference extension of stator yoke.

13. The motor of claim 12, wherein the stator teeth have a width of 1/20 to 1/15 of an outer diameter of the magnetic conductive ring in a circumferential direction of the stator.

14. The electric machine of claim 12, wherein a ratio of a thickness of the stator shoe in a radial direction of the stator to a width of the stator tooth is 1/2-2/3.

15. The electric machine of claim 12, wherein a minimum spacing between adjacent two of the stator shoes in the circumferential direction of the stator is 2mm-3mm.

16. The electric machine of claim 12, wherein a side surface of the stator shoe facing away from the stator teeth comprises:

a first arc segment extending circumferentially of the stator, the stator shoe being symmetrical about a perpendicular bisector of the first arc segment;

the second arc sections comprise two, and the two second arc sections are respectively connected to two sides of the first arc section in the circumferential direction of the stator.

17. The electric machine of claim 16, wherein the corresponding central angle a of the first arc segment satisfies: 1/6 (360 DEG/Z) a is more than or equal to 1/4 (360 DEG/Z), wherein Z is the number of stator teeth shoes.

18. The electric machine of claim 16, wherein the first arc segment is tangential to the second arc segment at a connection location, and a radius r2=1/6 (D-2T 1-2T 2) to 1/4 (D-2T 1-2T 2) of the second arc segment, wherein D is an outer diameter of the magnetic conductive ring, T1 is a thickness of the permanent magnet, and T2 is a thickness of the magnetic conductive ring.

19. An electrical device comprising a motor according to any one of claims 11-18.