CN110165802B

CN110165802B - Magnetic member of permanent magnet motor

Info

Publication number: CN110165802B
Application number: CN201810149269.4A
Authority: CN
Inventors: 朱守昱
Original assignee: Adlee Powertronic Co Ltd
Current assignee: Adlee Powertronic Co Ltd
Priority date: 2018-02-13
Filing date: 2018-02-13
Publication date: 2020-10-20
Anticipated expiration: 2038-02-13
Also published as: CN110165802A

Abstract

The invention provides a magnetic member of a permanent magnet motor, comprising a rotor, wherein the rotor defines an axis, and the magnetic member of the permanent magnet motor comprises: a first end part and a second end part which are arranged at the opposite sides along a first direction, the first end part and the second end part are provided with a magnetic pole surface, a radial distance is defined between the magnetic pole surface and the axis, and a second direction is perpendicular to the first direction and is parallel to the axis; the magnetic pole faces of the first end part and the second end part respectively define at least one first point and at least one second point at the maximum radial distance, a reference line passes through the first point and the second point and is intersected with the second direction, the reference lines of the first end part and the second end part respectively form an included angle with the second direction, and the radial distances from the two opposite sides of the first end part and the second end part to the reference line of the first end part along the second direction are gradually increased. The magnetic piece of the permanent magnet motor can reduce the cogging torque effect.

Description

Magnetic member of permanent magnet motor

Technical Field

The invention relates to a magnetic part, in particular to a magnetic part of a permanent magnet motor.

Background

The permanent magnet brushless motor mainly comprises a motor shell, a stator and a rotor. The stator is stamped by silicon steel sheets and is provided with a slotted hole. Wherein the slot is used for winding a coil, and the coil can be a copper wire or an aluminum wire. The rotor can rotate relative to the stator; the rotor comprises a shaft center and a magnetic pole magnet; and the driving circuit is electrically connected with the coil of the stator and can adjust the current flowing to the coil so that the stator coil forms a rotating magnetic field. The rotating magnetic field and the rotor magnetic field are alternately converted to form torque so as to rotate the rotor.

Rotors of the known art typically produce cogging torque during operation. The cogging torque is mainly caused by the fact that the magnetic poles of the rotor pass through the slots (and teeth) of the stator when the rotor rotates.

However, in the prior art permanent magnet motor, as disclosed in US7245054, the rotor and the stator are straight slots, the pole magnets are divided into N segments in the stack thickness direction, N is greater than 1, and the pole magnets have an eccentric arc surface to reduce the cogging torque. However, if the cogging torque is reduced to be extremely low, the number of segments of the magnetic pole magnet in the stack thickness direction increases, and the greater the number of segments, the more difficult the production and assembly. In addition, the larger the center of the eccentric arc surface of the pole magnet deviates from the center of the rotor, which reduces the effective magnetic flux density and also affects the output performance of the permanent magnet motor.

Therefore, there is a need to provide a new and improved magnetic member for a permanent magnet motor to solve the above problems.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a magnetic member of a permanent magnet motor, which can reduce cogging torque effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

a magnetic member of a permanent magnet motor, the permanent magnet motor includes a stator and a rotor that can rotate relative to the stator, the stator is surrounded with a plurality of grooves, the rotor defines an axial line, the magnetic member of the permanent magnet motor is provided for the rotor, the magnetic member of the permanent magnet motor includes: two end parts, which are arranged on two opposite sides along a first direction and are respectively a first end part and a second end part, wherein the first end part and the second end part are respectively provided with a magnetic pole surface in a thickness direction, a radial distance is defined between the magnetic pole surface and the axis, the first direction is vertical to a second direction, the second direction is parallel to the axis and passes through the magnetic pole surface from the first end part to the second end part; the magnetic pole surfaces of the first end part and the second end part respectively define at least one first point and at least one second point at the maximum radial distance, the magnetic pole surfaces of the first end part and the second end part respectively define a reference line, the reference line passes through the first point and the second point and is intersected with the second direction, an included angle is formed between the reference line and the second direction, the radial distance of the first end part from two opposite sides along the second direction to the reference line of the first end part is gradually increased, the radial distance of the second end part from two opposite sides along the second direction to the reference line of the second end part is gradually increased, and the reference line of the first end part and the reference line of the second end part are respectively positioned on the opposite sides of the second direction; when the included angle formed between the reference line of the first end part and the second direction is not equal to the included angle formed between the reference line of the second end part and the second direction, the reference line of the first end part and the reference line of the second end part are connected with each other to form a straight line, and when the included angle formed between the reference line of the first end part and the second direction is not equal to the included angle formed between the reference line of the second end part and the second direction, the reference line of the first end part and the reference line of the second end part are connected with each other to form a non-straight line; the magnetic pole surfaces of the first end part and the second end part are divided into a first side magnetic pole surface and a second side magnetic pole surface by the reference line respectively, the first side magnetic pole surface and the second side magnetic pole surface of the first end part share the same reference line, the first side magnetic pole surface and the second side magnetic pole surface of the second end part share the same reference line, the first side magnetic pole surface and the second side magnetic pole surface of the first end part are gradually increased from the outer side to the direction of the reference line respectively, and the first side magnetic pole surface and the second side magnetic pole surface of the second end part are gradually increased from the outer side to the direction of the reference line respectively.

Further, in the above-mentioned case,

and calculating the minimum common multiple of the number of the magnetic pieces and the plurality of grooves of the permanent magnet motor, wherein the included angle is 360 degrees divided by the minimum common multiple.

The included angle between the reference line of the first end part and the second direction is the same as the included angle between the reference line of the second end part and the second direction.

The included angle between the reference line of the first end part and the second direction is different from the included angle between the reference line of the second end part and the second direction.

The magnetic pole surfaces of the first end part and the second end part are cambered surfaces respectively.

The cross sections of the first end part and the second end part in the thickness direction comprise the magnetic pole surfaces, and the magnetic pole surfaces of any two cross sections are arc surfaces with non-concentric centers.

The magnetic pole surfaces of the first end part and the second end part respectively comprise a plurality of polygons, and the polygons are mutually connected at an angle to form a polygonal cambered surface.

The polygons are respectively long strips extending in parallel with the axial lead direction, and the long strips are mutually connected and arranged along the first direction to form arc surfaces.

The magnetic piece of the permanent magnet motor also comprises an inner peripheral surface, the inner peripheral surface is arranged on the opposite side of the magnetic pole surface in the thickness direction, and the inner peripheral surface and the magnetic pole surface are non-concentric arc surfaces.

The included angle between the reference line of the first end part and the second direction is the same as or different from the included angle between the reference line of the second end part and the second direction; the magnetic pole surfaces of the first end part and the second end part respectively comprise a plurality of polygons, and the polygons are mutually connected at an angle to form a polygonal cambered surface; the magnetic piece of the permanent magnet motor also comprises an inner peripheral surface, the inner peripheral surface is arranged on the opposite side of the magnetic pole surface in the thickness direction, and the inner peripheral surface and the magnetic pole surface are non-concentric arc surfaces.

To achieve the above object, the present invention further provides a magnetic member of a permanent magnet motor, the permanent magnet motor includes a stator and a rotor rotatable relative to the stator, the stator is surrounded by a plurality of grooves, the rotor defines an axis, the magnetic member of the permanent magnet motor is disposed on the rotor, the magnetic member of the permanent magnet motor includes: two end parts, which are arranged on two opposite sides along a first direction and are respectively a first end part and a second end part, wherein the first end part and the second end part are respectively provided with a magnetic pole surface in a thickness direction, a radial distance is defined between the magnetic pole surface and the axis, the first direction is vertical to a second direction, the second direction is parallel to the axis and passes through the magnetic pole surface from the first end part to the second end part; the magnetic pole faces of the first end part and the second end part respectively define two first points and two second points at the maximum radial distance, the first points and the second points are connected by a reference line intersecting in the first direction and the second direction, the first end part and the second end part are divided by the reference line from a first side part and a second side part at two opposite sides, an included angle is formed between the reference line and the second direction at the first end part and the second end part respectively, the first side part and the second side part of the first end part and the second end part are gradually increased from the outer side to the radial distance of the reference line, and the first points and the second points are respectively positioned at the opposite sides of the second direction.

Further, in the above-mentioned case,

the first points of the first and second side magnetic pole surfaces of the first end part are arranged at intervals, the second points of the first and second side magnetic pole surfaces of the second end part are arranged at intervals, and a groove is arranged between the two reference lines of the first and second end parts.

The magnetic pole surfaces of the first end part and the second end part are respectively in a wavy shape, and the plurality of wave crests of the magnetic pole surfaces are lower than the first points and the second points respectively.

The polygons are respectively long strips extending parallel to the axial lead direction, and the long strips are mutually connected and arranged along the first direction and are approximately arc surfaces.

First points of the first and second side magnetic pole surfaces of the first end part are arranged at intervals, second points of the first and second side magnetic pole surfaces of the second end part are arranged at intervals, and a groove is arranged between two reference lines of the first and second end parts; the included angle between the reference line of the first end part and the second direction is the same as or different from the included angle between the second end part and the second direction; the magnetic pole surfaces of the first end part and the second end part respectively comprise a plurality of polygons, the polygons are mutually connected at an angle to form a polygonal arc surface or the magnetic pole surfaces of the first end part and the second end part are respectively in a wavy shape, and a plurality of wave crests of the magnetic pole surfaces are respectively lower than each first point and each second point; the polygons are respectively long strips extending parallel to the axial lead direction, and the long strips are mutually connected and arranged along the first direction to form arc surfaces; the magnetic piece of the permanent magnet motor also comprises an inner peripheral surface, the inner peripheral surface is arranged on the opposite side of the magnetic pole surface in the thickness direction, and the inner peripheral surface and the magnetic pole surface are non-concentric arc surfaces; the two reference lines of the first end part and the second end part are arranged in parallel with the groove.

The invention has the advantages that:

the magnetic piece of the permanent magnet motor can reduce the cogging torque effect.

Drawings

Fig. 1 is a perspective view of a first preferred embodiment of the present invention.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a perspective view of the first preferred embodiment of the present invention in a use state.

Fig. 4 is a cross-sectional view of a mid-section of the structure shown in fig. 3.

Fig. 5 is a cross-sectional view of the tip portion in the structure shown in fig. 3.

Fig. 6 is a cross-sectional view of the bottom end of the structure of fig. 3.

Fig. 7 is a perspective view of a second preferred embodiment of the present invention.

Fig. 8 is a front view of fig. 7.

Fig. 9 is a perspective view of a third preferred embodiment of the present invention.

Fig. 10 is a side view of fig. 9.

Fig. 11 is a side view of a fourth preferred embodiment of the present invention.

Fig. 12 is a perspective view of a fifth preferred embodiment of the present invention.

Fig. 13 is a perspective view of a sixth preferred embodiment of the present invention.

Fig. 14 is a perspective view of a seventh preferred embodiment of the present invention.

Fig. 15 is a side view of fig. 14.

Fig. 16 is a perspective view of an eighth preferred embodiment of the present invention.

Fig. 17 is a side view of fig. 16.

Detailed Description

The following description is given by way of example only, and is not intended to limit the scope of the invention.

Referring to fig. 1 to 6, which show a first preferred embodiment of the present invention, a permanent magnet motor 1 of the present invention, a permanent magnet motor 2 includes a stator 3 and a rotor 4 rotatable relative to the stator 3, the stator 3 is surrounded by a plurality of slots 5, the rotor 4 defines an axis L1, the permanent magnet motor 1 is disposed on the rotor 4, the permanent magnet motor 1 includes: two

end portions

10,20, which are disposed on two opposite sides along the first direction L2 and are respectively a first end portion 10 and a second end portion 20, the first end portion 10 and the second end portion 20 are respectively provided with a

magnetic pole face

11,21 in a thickness direction, a radial distance R1, R2 is defined between the

magnetic pole face

11,21 and the axial line L1, the first direction L2 is perpendicular to the second direction L5, the second direction L5 is parallel to the axial line L1 and passes through the

magnetic pole face

11,21 from the first end portion 10 to the second end portion 20; the magnetic pole faces 11,21 of the first and

second end portions

10,20 respectively define at least one first point 12 and at least one second point 22 at the maximum radial distances R1, R2, the first and

second end portions

10,20 may have a plurality of first and

second points

12,22 along the second direction L5, the magnetic pole faces 11,21 of the first and

second end portions

10,20 respectively define a reference lines L3, L4, the reference lines L3, L4 pass through the respective first and

second points

12,22 and intersect the second direction L5, the reference lines L3, L4 and the second direction L5 form included angles θ 1, θ 2, the first end portion 10 is gradually increased from the radial distances R1 along the opposite sides in the second direction L5 to the reference line L3 of the first end portion 10, the second end portion 20 is gradually increased from the radial distances R6 along the opposite sides in the second direction L5 to the reference line L4 of the second end portion 20, the reference lines L73742 of the second end portion 20 are respectively located at the opposite sides in the second direction L6327, therefore, the magnetic member 1 of the permanent magnet motor has asymmetric thickness so as to reduce the cogging torque effect. A reference line L3 of the first end portion 10 and a reference line L4 of the second end portion 20 are respectively connected to the second direction L5, when the included angle θ 1 formed between the reference line L3 of the first end portion 10 and the second direction L5 is equal to the included angle θ 2 formed between the reference line L4 of the second end portion 20 and the second direction L5, the reference line L3 of the first end portion 10 and the reference line L4 of the second end portion 20 are connected to each other to form a straight line, when the included angle θ 1 formed between the reference line L3 of the first end portion 10 and the second direction L5 is not equal to the included angle θ 2 formed between the reference line L4 of the second end portion 20 and the second direction L5, the reference line L3 of the first end portion 10 and the reference line L4 of the second end portion 20 are connected to each other to form a non-straight line; the magnetic pole faces 11 and 21 of the first and

second end portions

10 and 20 are respectively divided into a first side

magnetic pole face

101 and 201 and a second side

magnetic pole face

102 and 202 by the reference lines L3 and L4, the first side magnetic pole face 101 and the second side magnetic pole face 102 of the first end portion 10 share the same reference line L3, the first side magnetic pole face 201 and the second side magnetic pole face 202 of the second end portion 20 share the same reference line L4, the first side magnetic pole face 101 and the second side magnetic pole face 201 of the first end portion 10 respectively increase in radial distance from the outside to the reference line direction L3, and the first side magnetic pole face 201 and the second side magnetic pole face 202 of the second end portion 20 respectively increase in radial distance from the outside to the reference line direction L4. The minimum common multiple of the number of the magnetic pieces 1 and the plurality of grooves 5 of the permanent magnet motor is calculated, the included angle theta 1 and theta 2 is 360 degrees divided by the minimum common multiple, so that the cogging torque effect can be reduced to be extremely low, and the vibration and the noise generated by the permanent magnet motor 2 are reduced. For example, if the stator has 12 slots and the rotor has 10 poles, the ripple caused by the cogging torque will occur twelve times per rotation, and if the included angle is 6 degrees (the least common multiple of 12 and 10 is 60, and 360 is divided by 60 to obtain the included angle degrees), the ripple caused by the cogging torque can be effectively reduced.

The pole faces 11,21 of the first and

second end portions

10,20 are respectively arc faces. Please refer to fig. 4 to 6, which are schematic diagrams of a plurality of permanent magnet motor magnetic pieces 1 disposed on different cross sections of a permanent magnet motor 2, respectively, which are sectional views of a middle section, a top end section and a bottom end section of a usage state perspective view of fig. 3, respectively, the cross sections of the first and

second end sections

10,20 in the thickness direction include magnetic pole faces 11,21, the magnetic pole faces 11,21 of any two cross sections are arc faces with different centers of circles, and the magnetic pole faces 11,21 of fig. 4 to 6 have different centers of circles, so that the magnetic pieces 1 of the permanent magnet motor are asymmetric in front, back, left and right, and can preferably reduce the cogging torque effect. In other embodiments, the magnetic pole faces 11 and 21 of any two cross sections may also be concentric arc faces.

In use, as shown in fig. 4 to 6, a plurality of magnetic members 1 of the permanent magnet motor of the present invention are provided to surround the rotor 4 and rotate relative to the stator, and the magnetic pole surfaces 11,21 of the magnetic members 1 of each permanent magnet motor and the stator 3 form an asymmetric air gap 6 width due to the asymmetric thickness of the magnetic members 1 of the permanent magnet motor. The magnetic member 1 of the permanent magnet motor of the present invention has a better magnetic flux density, and can reduce the cogging torque effect, so that the permanent magnet motor 2 can stably output.

Referring to fig. 7 to 8, it is shown that the included angles θ 1 and θ 2 between the first and second ends 10 and 20 are different according to a second preferred embodiment of the present invention.

In addition, please refer to fig. 9 to 10, which show a third preferred embodiment of the present invention, which is different from the first preferred embodiment in that the included angles θ 1 and θ 2 of the first and

second end portions

10 and 20 are different, and they are an eccentric magnetic member. As is revealed in fig. 9, the position of the first direction L2 is biased to the left of the magnetic member 1.

Referring to fig. 11, a fourth preferred embodiment of the present invention is shown, which is different from the first preferred embodiment in that the magnetic member 1 of the permanent magnet motor includes an inner circumferential surface 30, the inner circumferential surface 30 is disposed on the opposite side of the thickness direction where the magnetic pole surfaces 11 and 21 are disposed, and the inner circumferential surface 30 and the magnetic pole surfaces 11 and 21 are non-concentric arc surfaces. In detail, the inner circumferential surface 30 substantially corresponds to the outer circumferential shape of the rotor 4.

As shown in fig. 12, which shows a fifth preferred embodiment of the present invention, the difference between the magnetic piece 1c of the permanent magnet motor and the first embodiment is that the magnetic pole surfaces 11,21 of the first and

second end portions

10,20 respectively comprise a plurality of

polygons

13,31, and the

polygons

13,31 are connected with each other at an angle to form a polygon arc surface; in this embodiment, the magnetic pole faces 11 and 21, which are arc faces in the other embodiments, are cut into a plurality of

polygons

13 and 31 with different thicknesses. The

polygons

13,31 are respectively long strips extending parallel to the axis L1, and the long strips are mutually arranged along the first direction L2 and are approximately arc surfaces. In other embodiments, for example, fig. 13, the plurality of

polygons

13,31 of the magnetic element 1d of the permanent magnet motor may be, for example, triangular, quadrangular, hexagonal or trapezoidal, that is, the magnetic pole faces 11,21 of the first and

second end portions

10,20 may be respectively formed by connecting a plurality of polygons 13,31 (which may be the same shape or different shapes); in this embodiment, the magnetic pole faces 11 and 21, which are arc faces in the other embodiments, are cut into a plurality of

polygons

13 and 31 with different thicknesses.

Referring to fig. 14 to 15, a seventh preferred embodiment of the present invention is shown, which is different from the first preferred embodiment in that the magnetic pole faces 11,21 of the first and

second end portions

10,20 respectively define two reference lines, the magnetic pole face 11 of the first end portion 10 has two reference lines L3, the magnetic pole face 21 of the second end portion 20 has two reference lines L4, and the two reference lines L3 of the first end portion 10 and the two reference lines L4 of the second end portion 20 respectively pass through the magnetic pole faces 11,21 and intersect in the second direction L5. Reference lines L3 and L4 form an included angle theta 1 and theta 2 with the second direction L5, the magnetic pole faces 11 and 21 of the first and second end portions 10 and 20 are respectively divided by the reference lines L3 and L4 into the first side magnetic pole faces 101 and 201 and the second side magnetic pole faces 102 and 202, the maximum radial distance between the first and second side magnetic pole faces 101 and 102 of the first end portion 10 is respectively provided with a first point 12, the maximum radial distance between the first and second side magnetic pole faces 201 and 202 of the second end portion 20 is respectively provided with a second point 22, two reference lines L3 of the first end portion 10 are respectively connected with the two first points 12, two reference lines L4 of the second end portion 20 are respectively connected with the two second points 22, two reference lines L3 of the first end portion 10 are respectively connected with the two reference lines L4 of the second end portion 20, the first point 12 of the first and second side magnetic pole faces 101,102 of the first end portion 10 and the second point 22 of the first and second side magnetic pole faces 201,202 of the second end portion 20 are located on opposite sides of the second direction L5, respectively; the first and second side magnetic pole surfaces 101 and 102 of the first end portion 10 have an increasing radial distance from the outer side toward the reference line L3, and the first and second side magnetic pole surfaces 201 and 202 of the second end portion 20 have an increasing radial distance from the outer side toward the reference line L4. Therefore, the cogging torque effect can be effectively improved and reduced, so that the permanent magnet motor 2 can smoothly operate.

To explain, referring to fig. 1 to 11, the two reference lines L3 of the magnetic pole face 11 of the first end portion 10 and the two reference lines L4 of the magnetic pole face 21 of the second end portion 20 may overlap each other, that is, the first points 12 of the first side magnetic pole face 101 and the second side magnetic pole face 102 of the first end portion 10 are located at the same position, and the second points 22 of the first side magnetic pole face 201 and the second side magnetic pole face 202 of the second end portion 20 are located at the same position. In another embodiment, as shown in fig. 14 to 17, the two reference lines L3 of the magnetic pole face 11 of the first end portion 10 may be spaced apart; the two reference lines L4 of the pole face 21 of the second end portion 20 may be spaced apart, that is, the first points 12 of the first and second side pole faces 101,102 of the first end portion 10 are spaced apart, and the second points 22 of the first and second side pole faces 201,202 of the second end portion 20 are spaced apart. Referring to fig. 14 to 15, a groove 40 is formed between two reference lines L3 and L4 of the first and

second end portions

10 and 20, respectively, so as to effectively improve and reduce the cogging torque effect, and enable the permanent magnet motor 2 to operate smoothly. In the present embodiment, the two reference lines L3 of the first end portion 10 and the groove 40 are parallel to each other; the two reference lines L4 of the second end portion 20 and the groove 40 are arranged parallel to each other. Furthermore, the groove bottom of the groove 40 is lower than the pole faces 11,21 of the first and

second end portions

10, 20.

Referring to fig. 16 to 17, which show an eighth preferred embodiment of the present invention, the magnetic pole faces 11,21 of the first and

second end portions

10,20 are respectively wavy, and a plurality of wave crests 111 of the magnetic pole face 11 of the first end portion 10 are respectively lower than each first point 12 and each second point 22; the plurality of peaks 211 of the pole face 21 of the second end portion 20 are lower than the first points 12 and the second points 22, respectively, to reduce the cogging torque effect.

In use, a plurality of magnetic members 1 of the permanent magnet motor of the present invention are annularly arranged on the rotor 4 and can rotate relative to the stator 3, and the magnetic pole surfaces 11 and 21 of the magnetic members 1 of each permanent magnet motor and the stator 3 form an asymmetric air gap 6 width because the thickness of the magnetic members 1 of the permanent magnet motor is asymmetric. The magnetic member 1 of the permanent magnet motor of the present invention has a better magnetic flux density, and can reduce the cogging torque effect, so that the permanent magnet motor 2 can stably output.

The seventh and eighth embodiments may also have the following features:

the pole faces 11,21 of the first and second ends 10,20 may be arc faces, respectively. Please refer to fig. 4 to 6, which are schematic diagrams of a plurality of permanent magnet motor magnetic pieces 1 respectively disposed on different cross sections of a permanent magnet motor 2, and are respectively a sectional view sequentially from a middle section, a top end portion and a bottom end portion of a use state perspective view of fig. 3, wherein the cross section of the first end portion 10 and the second end portion 20 in the thickness direction includes magnetic pole surfaces 11 and 21, the magnetic pole surfaces 11 and 21 of any two cross sections are arc surfaces with different centers of circles, the magnetic pole surfaces 11 and 21 of fig. 4 to 6 respectively have different centers of circles, and the magnetic pieces 1 of the permanent magnet motor are asymmetric in front, back, left and right, so as to preferably reduce the cogging torque effect. In other embodiments, the magnetic pole faces 11 and 21 of any two cross sections may also be concentric arc faces.

Further, the included angles θ 1 and θ 2 of the first and

second end portions

10 and 20 are different, for example, refer to fig. 7 to 8.

In addition, the included angles θ 1, θ 2 of the first and

second end portions

10,20 may also be different, and are an eccentric magnetic member, as shown in fig. 9 to 10. Further, as shown in fig. 9, the first direction L2 is biased to the left of the magnetic member 1.

Further, the magnetic member 1 of the permanent magnet motor includes an inner peripheral surface 30, the inner peripheral surface 30 is disposed on the opposite side of the thickness direction on which the magnetic pole surfaces 11 and 21 are disposed, and the inner peripheral surface 30 and the magnetic pole surfaces 11 and 21 are non-concentric arc surfaces, as shown in fig. 11. In detail, the inner circumferential surface 30 substantially corresponds to the outer circumferential shape of the rotor 4.

The pole faces 11,21 of the first and

second end portions

10,20 respectively include a plurality of

polygons

13,31, and the

polygons

13,31 are connected to each other at an angle to form a polygonal arc surface, as shown in fig. 12. Further, the pole faces 11,21, which are arc faces in the other embodiments, are cut into a plurality of

polygons

13,31 with different thicknesses. The

polygons

13 and 31 are respectively long strips extending parallel to the axis L1, and the long strips are mutually connected and arranged along the first direction L2 to form a slightly arc surface. In other embodiments, for example, fig. 13, the plurality of

polygons

13,31 of the magnetic member 1d of the permanent magnet motor may be, for example, triangular, quadrangular, hexagonal or trapezoidal, that is, the magnetic pole faces 11,21 of the first and

second end portions

10,20 may be respectively formed by connecting the plurality of polygons 13,31 (which may be the same shape or different shapes); in this embodiment, the magnetic pole faces 11 and 21, which are arc faces in the other embodiments, are cut into a plurality of

polygons

13 and 31 with different thicknesses.

In summary, an included angle (i.e. an oblique arrangement) is formed between the reference line of the first end portion and the second end portion of the magnetic member of the permanent magnet motor and the second direction, which is the minimum position of the air gap, and the reference line of the first end portion and the second end portion of the magnetic member of the permanent magnet motor is the maximum position of the air gap at the opposite sides of the magnetic member, so that the length of the air gap in the axial direction of the rotor is minimized.

The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solution of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a magnetic part of permanent magnet motor, this permanent magnet motor includes a stator and a rotor that can rotate relatively this stator, and this stator ring establishes the plural recess, and this rotor definition axial lead, this permanent magnet motor's magnetic part confession are located this rotor, and its characterized in that, this permanent magnet motor's magnetic part includes:

two end parts which are arranged on two opposite sides along a first direction and are respectively a first end part and a second end part, wherein the first end part and the second end part are respectively provided with a magnetic pole surface in a thickness direction, a radial distance is defined between the magnetic pole surface and the axis, the first direction is vertical to a second direction which is parallel to the axis and passes through the magnetic pole surface from the first end part to the second end part; the magnetic pole surfaces of the first end part and the second end part respectively define at least one first point and at least one second point at the maximum radial distance, the magnetic pole surfaces of the first end part and the second end part respectively define a reference line, the reference line of the first end part is intersected with the second direction through the first point, the reference line of the second end part is intersected with the second direction through the second point, an included angle is formed between the reference line of the first end part and the reference line of the second end part and the second direction respectively, the radial distance from the first end part to the reference line of the first end part is gradually increased from two opposite sides in the second direction, the radial distance from the second end part to the reference line of the second end part is gradually increased from two opposite sides in the second direction, and the reference line of the first end part and the reference line of the second end part are respectively positioned on the opposite sides of the second direction;

when the included angle formed between the reference line of the first end part and the second direction is not equal to the included angle formed between the reference line of the second end part and the second direction, the reference line of the first end part and the reference line of the second end part are connected with each other to form a straight line, and when the included angle formed between the reference line of the first end part and the second direction is not equal to the included angle formed between the reference line of the second end part and the second direction, the reference line of the first end part and the reference line of the second end part are connected with each other to form a non-straight line; the magnetic pole surfaces of the first end part and the second end part are divided into a first side magnetic pole surface and a second side magnetic pole surface by the reference line respectively, the first side magnetic pole surface and the second side magnetic pole surface of the first end part share the same reference line, the first side magnetic pole surface and the second side magnetic pole surface of the second end part share the same reference line, the first side magnetic pole surface and the second side magnetic pole surface of the first end part are gradually increased from the outer side to the direction of the reference line respectively, and the first side magnetic pole surface and the second side magnetic pole surface of the second end part are gradually increased from the outer side to the direction of the reference line respectively.

2. The permanent magnet motor magnet of claim 1 wherein the angle is calculated as the least common multiple of the number of permanent magnet motor magnets and the plurality of slots, and is 360 degrees divided by the least common multiple.

3. The magnetic member of a permanent magnet motor according to claim 1, wherein the reference line of the first end portion is at the same angle to the second direction as the reference line of the second end portion.

4. The magnetic member of a permanent magnet motor according to claim 1, wherein the angle between the reference line of the first end portion and the second direction is different from the angle between the reference line of the second end portion and the second direction.

5. The magnetic member of a permanent magnet motor according to claim 1, wherein the magnetic pole faces of the first and second end portions are respectively arc faces.

6. The magnetic member of a permanent magnet motor according to claim 5, wherein the cross section of the first and second end portions in the thickness direction includes the magnetic pole faces, and the magnetic pole faces of any two cross sections are non-concentric arc faces.

7. The magnetic member of a permanent magnet motor according to claim 1, wherein the magnetic pole faces of the first and second end portions each comprise a plurality of polygons, and the polygons are angularly connected to each other to form a polygonal arc.

8. The magnetic member of a permanent magnet motor according to claim 7, wherein each of the plurality of polygons is a strip extending parallel to the axis, and the plurality of strips are arranged in a circular arc shape along the first direction.

9. The magnet member of a permanent magnet motor according to any one of claims 1 to 8, further comprising an inner peripheral surface provided on the opposite side of the thickness direction on which the magnetic pole surface is provided, the inner peripheral surface and the magnetic pole surface being non-concentric arc surfaces.

10. The magnetic member of the permanent magnet motor according to claim 6, wherein the angle between the reference line of the first end portion and the second direction is the same as or different from the angle between the reference line of the second end portion and the second direction; the magnetic pole surfaces of the first end part and the second end part respectively comprise a plurality of polygons, and the polygons are mutually connected at an angle to form a polygonal cambered surface; the magnetic piece of the permanent magnet motor also comprises an inner peripheral surface, the inner peripheral surface is arranged on the opposite side of the magnetic pole surface in the thickness direction, and the inner peripheral surface and the magnetic pole surface are non-concentric arc surfaces.

11. The utility model provides a magnetic part of permanent magnet motor, this permanent magnet motor includes a stator and a rotor that can rotate relatively this stator, and this stator ring establishes the plural recess, and this rotor definition axial lead, this permanent magnet motor's magnetic part confession are located this rotor, and its characterized in that, this permanent magnet motor's magnetic part includes:

two end parts, which are arranged on two opposite sides along a first direction and are respectively a first end part and a second end part, wherein the first end part and the second end part are respectively provided with a magnetic pole surface in a thickness direction, a radial distance is defined between the magnetic pole surface and the axis, the first direction is vertical to a second direction, the second direction is parallel to the axis and passes through the magnetic pole surface from the first end part to the second end part; the magnetic pole surfaces of the first end part and the second end part respectively define two reference lines which pass through the magnetic pole surfaces and intersect in the second direction, an included angle is formed between each reference line and the second direction, the magnetic pole faces of the first and second end parts are divided into a first side magnetic pole face and a second side magnetic pole face by the reference lines respectively, the maximum radial distance positions of the first and the second side magnetic pole surfaces of the first end part are respectively provided with a first point, the maximum radial distance positions of the first and the second side magnetic pole surfaces of the second end part are respectively provided with a second point, the two reference lines of the first end part are respectively connected with two first points, the two reference lines of the second end part are respectively connected with two second points, the two reference lines of the first end part are respectively connected with the two reference lines of the second end part, and the first points of the first and the second side magnetic pole surfaces of the first end part and the second points of the first and the second side magnetic pole surfaces of the second end part are respectively positioned on the opposite sides of the second direction; the radial distance from the outer sides of the first and the second side magnetic pole faces of the first end part to the direction of the reference line is gradually increased, and the radial distance from the outer sides of the first and the second side magnetic pole faces of the second end part to the direction of the reference line is gradually increased.

12. The magnet assembly of claim 11, wherein the first points of the first and second side pole faces of the first end portion are spaced apart, the second points of the first and second side pole faces of the second end portion are spaced apart, and a groove is defined between the reference lines of the first and second end portions.

13. The magnetic member of a permanent magnet motor according to claim 11, wherein the magnetic pole surfaces of the first and second end portions are respectively wavy, and a plurality of peaks of the magnetic pole surfaces are respectively lower than the first points and the second points.

14. The magnetic member of a permanent magnet motor according to claim 11, wherein the reference line of the first end portion is at the same angle to the second direction as the reference line of the second end portion.

15. The magnetic member of a permanent magnet motor according to claim 11, wherein the reference line of the first end portion is at an angle different from the angle of the reference line of the second end portion.

16. The magnetic member of a permanent magnet motor according to claim 11, wherein the magnetic pole faces of the first and second end portions are respectively arc faces.

17. The magnetic member of a permanent magnet motor according to claim 16, wherein the cross section of the first and second end portions in the thickness direction includes the magnetic pole faces, and the magnetic pole faces of any two cross sections are non-concentric arc faces.

18. The magnetic member of a permanent magnet motor according to claim 11, wherein the magnetic pole faces of the first and second end portions respectively comprise a plurality of polygons, and the polygons are angularly connected to each other to form a polygonal arc.

19. The magnetic member of a permanent magnet motor according to claim 18, wherein each of the plurality of polygons is a strip extending parallel to the axial direction, and the plurality of strips are connected to each other in the first direction and arranged in a substantially arc shape.

20. The magnetic member of a permanent magnet motor according to claim 17, wherein the first points of the first and second side pole faces of the first end portion are spaced apart from each other, the second points of the first and second side pole faces of the second end portion are spaced apart from each other, and a groove is formed between the reference lines of the first and second end portions; the included angle between the reference line of the first end part and the second direction is the same as or different from the included angle between the reference line of the second end part and the second direction; the magnetic pole surfaces of the first end part and the second end part respectively comprise a plurality of polygons, the polygons are mutually connected at an angle to form a polygonal arc surface or the magnetic pole surfaces of the first end part and the second end part are respectively in a wavy shape, and a plurality of wave crests of the magnetic pole surfaces are respectively lower than each first point and each second point; the polygons are respectively long strips extending parallel to the axial lead direction, and the long strips are mutually connected and arranged along the first direction to form arc surfaces; the magnetic piece of the permanent magnet motor also comprises an inner peripheral surface, the inner peripheral surface is arranged on the opposite side of the magnetic pole surface in the thickness direction, and the inner peripheral surface and the magnetic pole surface are non-concentric arc surfaces; the two reference lines of the first end part and the second end part are arranged in parallel with the groove.