Motor rotor, permanent magnet motor and vehicle

Abstract

The embodiment of the utility model provides a motor rotor, a permanent magnet motor and a vehicle. The motor rotor comprises a rotating part, wherein the rotating part is annular and defines a first through hole so as to be rotationally connected with a motor bearing; the magnetic piece group is arranged around the first through hole and comprises a first magnetic piece and a second magnetic piece, the first magnetic piece is made of neodymium iron boron magnetic steel and serves as main magnetic steel with good magnetism gathering capacity, and the second magnetic piece is made of ferrite magnetic steel and serves as auxiliary magnetic steel with good magnetism gathering capacity; and the volume V2 of the second magnetic piece and the volume V1 of the first magnetic piece meet the following relation: V1 < V2 < = 1.8 V1. In the embodiment of the invention, the second magnetic piece adopts the ferrite magnetic steel with lower cost, the size of the second magnetic piece is increased, the magnetic gathering effect is better, the magnetic induction intensity in the motor rotor is enhanced, and the problem of insufficient magnetic field of the ferrite magnetic steel is solved by increasing the size of the ferrite magnetic steel; the structure is simple and the cost is reduced while the mechanical performance of the permanent magnet motor in high-speed operation is satisfied.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor rotor, a permanent magnet motor and a vehicle. Background Art

[0002] Permanent magnet synchronous motors are widely used in many fields due to their high torque density, high power density, high efficiency and wide constant power range. Their performance is fully consistent with the operating conditions of new energy electric vehicles. Therefore, the proportion of permanent magnet synchronous motors used in the field of new energy electric vehicles has increased year by year and has now become dominant.

[0003] With the popularization of permanent magnet synchronous motors for new energy vehicles, the competition in performance and cost is becoming increasingly fierce. The new energy permanent magnet synchronous motors on the market use a large amount of permanent magnets, are large in size and have a high cost. Utility Model Content

[0004] The embodiments of the present application provide a motor rotor, a permanent magnet motor and a vehicle, aiming to ensure that the permanent magnet motor is small in size while saving costs.

[0005] An embodiment of the first aspect of the present application provides a motor rotor, which includes: a rotating part, which is annular and encloses a first through hole; a magnetic component group, which is arranged around the first through hole, and the magnetic component group includes a first magnetic component and a second magnetic component. The material of the first magnetic component includes neodymium iron boron magnet, and the material of the second magnetic component includes ferrite magnet, and the volume V1 of the second magnetic component and the volume V2 of the first magnetic component satisfy the following relationship: V2<V1≤1.8V2.

[0006] According to an embodiment of the first aspect of the present application, the length of the second magnetic component is 1-1.2 times the length of the first magnetic component, and / or the thickness of the second magnetic component is 1.2-1.5 times the thickness of the first magnetic component.

[0007] According to an implementation scheme of the first aspect of the present application, the magnetic component group includes two second magnetic components, which are located on the side of the first magnetic component facing the first through hole, and the distance between the two second magnetic components gradually increases along the direction away from the first through hole to enclose an opening, and the first magnetic component is located in the opening.

[0008] According to an implementation scheme of the first aspect of the present application, the motor rotor also includes a center plane, which passes through the central axis of the first through hole. In the same magnetic component group, the first magnetic component itself is symmetrically arranged about the center plane, and / or the two second magnetic components are symmetrically arranged along the center plane.

[0009] According to an implementation of the first aspect of the present application, there are multiple magnetic component groups, and the multiple magnetic component groups are evenly spaced and distributed around the first through hole.

[0010] According to the implementation of the first aspect of the present application, it also includes: a hollow portion that penetrates the rotating part axially and surrounds the first through hole, the magnetic component group is located in the hollow portion and is detachably connected to the hollow portion, and the size of the hollow portion is adapted to that of the magnetic component group.

[0011] According to an implementation of the first aspect of the present application, the rotating part further includes a weight-reducing hole extending axially through the rotating part.

[0012] According to an implementation of the first aspect of the present application, a plurality of weight-reducing holes are arranged at equal intervals around the first through hole.

[0013] According to an embodiment of the second aspect of the present application, a permanent magnet motor is provided, comprising the motor rotor as described above, the permanent magnet motor also comprising a motor stator, the motor stator comprising an annular fixed portion, the fixed portion encloses a second through hole, the rotating portion is located in the second through hole and has an air gap with the fixed portion.

[0014] According to an embodiment of the third aspect of the present application, a vehicle is provided, comprising the permanent magnet motor as described above.

[0015] The embodiment of the present application provides a motor rotor including: The embodiment of the present application provides a motor rotor, a permanent magnet motor and a vehicle, the motor rotor including: the rotating part is annular and encloses a first through hole to be rotatably connected with the motor bearing. The magnetic component group is arranged around the first through hole to generate a magnetic field to rotate the rotating part along the axis of the first through hole, the magnetic component group includes a first magnetic component and a second magnetic component, the material of the first magnetic component includes neodymium iron boron magnet steel as a main magnet with good magnetic concentration ability, the material of the second magnetic component includes ferrite magnet steel as a secondary magnet steel, and the volume V2 of the second magnetic component and the volume V1 of the first magnetic component satisfy the following relationship: V1<V2≤1.8V1. In the embodiment of the present application, the second magnetic component adopts a ferrite magnet steel with lower cost, and at the same time increases the volume of the second magnetic component, the magnetic concentration effect is better, the magnetic induction intensity in the motor rotor will be enhanced, and the problem of insufficient magnetic field of the ferrite magnet steel itself is compensated by increasing the volume of the ferrite magnet steel, so as to meet the mechanical performance of the permanent magnet motor when running at high speed while having a simple structure and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0017] Figure 1 It is a structural schematic diagram of a motor stator and a motor rotor provided in an embodiment of the present application.

[0018] Description of reference numerals:

[0019] 000-center plane;

[0020] 100-rotating part; 101-first through hole; 102-magnetic component group; 102a-first magnetic component; 102b-second magnetic component; 103-opening; 104-hollow part; 105-weight reduction hole;

[0021] 200 -fixing part; 201 -second through hole; 202 -inner surface; 203 -stator slot; 204 -insulating paper. DETAILED DESCRIPTION

[0022] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0023] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] In order to better understand this application, Figure 1 The motor rotor of the embodiment of the present application is described in detail.

[0026] Figure 1 It is a structural schematic diagram of a motor stator and a motor rotor provided in an embodiment of the present application.

[0027] See also Figure 1 , the embodiment of the first aspect of the present application provides a motor rotor including: a rotating part 100, which is annular and encloses a first through hole 101. A magnetic component group 102 is arranged around the first through hole 101, and the magnetic component group 102 includes a first magnetic component 102a and a second magnetic component 102b. The material of the first magnetic component 102a includes neodymium iron boron magnet steel, and the material of the second magnetic component 102b includes ferrite magnet steel, and the volume V2 of the second magnetic component 102b and the volume V1 of the first magnetic component 102a satisfy the following relationship: V1<V2≤1.8V1.

[0028] The embodiment of the first aspect of the present application provides a motor rotor, which includes: a rotating part 100 and a magnetic component group 102 installed on the rotating part 100, the rotating part 100 is annular and encloses a first through hole 101 to be rotatably connected with the motor bearing. The magnetic component group 102 is arranged around the first through hole 101 to generate a magnetic field to make the rotating part 100 rotate along the axis of the first through hole 101, and the magnetic component group 102 includes a first magnetic component 102a and a second magnetic component 102b. The material of the first magnetic component 102a includes neodymium iron boron magnet steel as a main magnet steel with good magnetic concentration ability, and the material of the second magnetic component 102b includes ferrite magnet steel as a secondary magnet steel, and the volume V2 of the second magnetic component 102b and the volume V1 of the first magnetic component 102a satisfy the following relationship: V1<V2≤1.8V1. In the embodiment of the present application, the second magnetic part 102b adopts a ferrite magnet with lower cost, and at the same time, the volume of the second magnetic part 102b is increased, the magnetic field concentration effect is better, the magnetic induction intensity in the motor rotor will be enhanced, and the problem of insufficient magnetic field of the ferrite magnet itself is compensated by increasing the volume of the ferrite magnet, thereby meeting the mechanical properties of the permanent magnet motor at high speed operation while having a simple structure and reducing costs.

[0029] Optionally, the first magnetic component 102a may be a N42UH neodymium iron boron magnet, and the second magnetic component 102b may be a Y40 ferrite magnet. The above magnets are relatively cheap and can meet the mechanical properties of the motor while saving costs.

[0030] Optionally, there is no specific requirement for the models of NdFeB magnets and ferrite magnets, as long as they can meet the mechanical properties of the motor.

[0031] In some optional embodiments, the length of the second magnetic member 102b is 1-1.2 times the length of the first magnetic member 102a, and / or the thickness of the second magnetic member 102b is 1.2-1.5 times the thickness of the first magnetic member 102a.

[0032] In these optional embodiments, the length of the second magnetic member 102b can be 1-1.2 times the length of the first magnetic member 102a, and the thickness of the second magnetic member 102b can be set to 1.2-1.5 times the thickness of the first magnetic member 102a, or the length of the second magnetic member 102b can be set to 1-1.2 times the length of the first magnetic member 102a, and the thickness of the second magnetic member 102b can be set to 1.2-1.5 times the thickness of the first magnetic member 102a. By increasing the length and width of the second magnetic member 102b, thereby increasing the volume of the second magnetic member 102b, using a lower-priced ferrite magnet, while meeting the mechanical properties of the motor rotor, it is more cost-saving.

[0033] Optionally, the length here refers to the length of the long side direction of the first magnetic part 102a / the second magnetic part 102b corresponding to the plane perpendicular to the axis of the first through hole 101, and the thickness refers to the thickness of the short side direction of the first magnetic part 102a / the second magnetic part 102b corresponding to the plane perpendicular to the axis of the through hole.

[0034] In some optional embodiments, the magnetic component group 102 includes two second magnetic components 102b, which are located on the side of the first magnetic component 102a facing the first through hole 101, and along the direction away from the first through hole 101, the distance between the two second magnetic components 102b gradually increases to enclose an opening 103, and the first magnetic component 102a is located in the opening 103.

[0035] In these optional embodiments, the first magnetic member 102a can be a "type I" magnetic steel, and along the direction away from the first through hole 101, the distance between the two second magnetic members 102b gradually increases to enclose and form an opening 103, so the two second magnetic members 102b can be called a "V-shaped" magnetic steel after being combined. The "V-shaped" magnetic steel and the "type I" magnetic steel are combined into a "V+one" magnetic steel. The present application adopts a built-in inverted triangle structure of a "V+one" magnetic steel, which has a simple assembly process, can improve the motor performance and the anti-demagnetization ability of the magnetic steel, and meet the mechanical properties of the motor.

[0036] There are various arrangements of the magnetic component group 102. In some optional embodiments, the motor rotor also includes a center plane 000, which passes through the central axis of the first through hole 101. In the same magnetic component group 102, the first magnetic component 102a itself is symmetrically arranged about the center plane 000, and / or the two second magnetic components 102b are symmetrically arranged along the center plane 000.

[0037] In these optional embodiments, in the same magnetic component group 102, the first magnetic component 102a itself may be symmetrically arranged about the center plane 000, or the two second magnetic components 102b may be symmetrically arranged along the center plane 000, or the first magnetic component 102a itself may be symmetrically arranged about the center plane 000, and the two second magnetic components 102b may be symmetrically arranged along the center plane 000. The mechanical properties of the rotor when running at high speed can be improved, which is beneficial to the high speed of the motor, the magnetic field concentration ability is stronger, and it is beneficial to increase the magnetic resistance torque of the motor and improve the torque density of the motor.

[0038] As described above, there are multiple magnetic component groups 102, there can be multiple center planes 000, and the multiple center planes are distributed at equal angles. In each magnetic component group 102, the first magnetic component 102a itself can be symmetrically arranged about the corresponding center plane 000, or the two second magnetic components 102b can be symmetrically arranged along the corresponding center plane 000. It can also be set that the first magnetic component 102a itself is symmetrically arranged about the corresponding center plane 000, and the two second magnetic components 102b are symmetrically arranged along the corresponding center plane 000, and the arrangement method of the first magnetic component 102a and the second magnetic component 102b of each magnetic component group 102 is the same.

[0039] In some optional embodiments, there are multiple magnetic member groups 102 , and the multiple magnetic member groups 102 are evenly spaced and distributed around the first through hole 101 .

[0040] In these optional embodiments, the plurality of magnetic component groups 102 are evenly spaced around the first through hole 101 , and have a stronger magnetic concentration capability, so as to provide magnetic force that satisfies the high-speed rotation of the motor and increase the torque density of the motor.

[0041] In some optional embodiments, the motor rotor also includes: a hollow portion 104 that penetrates axially along the rotating portion 100 and is arranged around the first through hole 101, the magnetic component group 102 is located in the hollow portion 104 and is detachably connected to the hollow portion 104, and the hollow portion 104 is adapted to the size of the magnetic component group 102.

[0042] In these optional embodiments, the magnetic component assembly 102 is mounted on the hollow portion 104 and is detachably connected to the hollow portion 104 .

[0043] In some optional embodiments, the rotating part 100 further includes a weight-reducing hole extending axially through the rotating part 100 .

[0044] In these optional embodiments, the rotating part 100 is penetrated along its own axial direction to form a weight-reducing hole 105. The weight-reducing hole 105 can reduce the weight of the motor rotor and meet the lightweight requirement of the motor rotor.

[0045] In some optional embodiments, a plurality of weight-reducing holes 105 are arranged at equal intervals around the first through hole 101 .

[0046] In these optional embodiments, the weight-reducing holes 105 may be triangular weight-reducing holes 105 and pentagonal weight-reducing holes 105. The weight-reducing holes 105 of different shapes may be used to reduce the weight of the motor rotor, meet the lightweight requirements of the motor rotor, and thus improve the power density of the permanent magnet motor.

[0047] According to an embodiment of the second aspect of the present application, a permanent magnet motor is provided, such as Figure 1 As shown, the permanent magnet motor includes the motor rotor as described above, and the motor stator includes a ring-shaped fixing portion 200 , the fixing portion 200 encloses a second through hole 201 , and the rotating portion 100 is located in the second through hole 201 and has an air gap with the fixing portion 200 .

[0048] In the embodiment provided in the second aspect of the present application, the permanent magnet motor includes a motor rotor and a motor stator, the motor rotor includes a rotating part 100 and a magnetic component group 102 mounted on the rotating part 100, the rotating part 100 is annular and encloses a first through hole 101 to be rotatably connected with the motor bearing. The magnetic component group 102 is arranged around the first through hole 101 to generate a magnetic field to rotate the rotating part 100 along the axis of the first through hole 101, the magnetic component group 102 includes a first magnetic component 102a and a second magnetic component 102b, the material of the first magnetic component 102a includes neodymium iron boron magnet steel as a main magnet with good magnetic concentration ability, the material of the second magnetic component 102b includes ferrite magnet steel as a secondary magnet, and the volume V2 of the second magnetic component 102b and the volume V1 of the first magnetic component 102a satisfy the following relationship: V1<V2≤1.8V1. There is an air gap between the rotating part 100 and the fixed part 200, and when the motor stator is energized, the AC electric field will react with the magnetic field of the motor rotor to generate a rotational force. In the embodiment of the present application, the second magnetic part 102b adopts a ferrite magnet with lower cost, and at the same time, the volume of the second magnetic part 102b is increased, the magnetic field concentration effect is better, the magnetic induction intensity in the motor rotor will be enhanced, and the problem of insufficient magnetic field of the ferrite magnet itself is compensated by increasing the volume of the ferrite magnet, thereby meeting the mechanical properties of the permanent magnet motor at high speed operation while having a simple structure and reducing costs.

[0049] Optionally, the fixing portion 200 also includes an inner surface 202 near the second through hole 201, the inner surface 202 is recessed in a direction away from the second through hole 201 to form a plurality of stator slots 203, the plurality of stator slots 203 surround the second through hole 201 and stator punching sheets are arranged in the stator slots 203, insulating paper 204 is arranged on both sides of the stator punching sheets, the insulating paper 204 protrudes axially from the fixing portion 200, and the copper wire is inserted into the insulating paper 204 circle and connected and welded.

[0050] Optionally, the stator sheet can be a silicon steel sheet, generally with a thickness of about 0.3 mm. The stator sheet is used to fix the winding, which will generate a constantly changing magnetic field around the motor rotor when the winding is energized, thereby causing the permanent magnet motor to rotate.

[0051] Optionally, the permanent magnet motor has 8 levels, that is, there can be 8 magnetic component groups 102, which are compatible with the magnetic component group 102 of the motor rotor, and 48 stator slots 203 are set accordingly, which can meet the mechanical properties of the permanent magnet motor while generating less noise during operation. The permanent magnet motor has a voltage of 540V, a current of 320A, a maximum speed of 12000 rpm, a maximum torque of 360Nm, a stack height of 125mm, a rotor of 6 sections, an extreme inclination of 5 degrees, an outer diameter of the motor stator of 210mm, an outer diameter of the motor rotor of 145mm, an air gap width of 0.8mm between the motor stator and the motor rotor, a width of 1.3mm for the magnetic isolation bridge located in the hollow portion 104, and a "V-shaped" magnetic steel angle that can be adjusted according to actual simulation results.

[0052] Optionally, the number of magnetic component groups 102 may be 6, and 54 stator slots 203 may be provided accordingly.

[0053] Optionally, there are many ways to match the number of stator slots 203 and the number of motor rotor magnetic component groups 102, and there is no specific limitation, as long as the mechanical properties of the permanent magnet motor can be met.

[0054] According to an embodiment of the third aspect of the present application, a vehicle is provided, comprising the permanent magnet motor as described above.

[0055] In the embodiment provided in the third aspect of the present application, a vehicle includes a permanent magnet motor, the permanent magnet motor includes a motor rotor, the motor rotor includes: a rotating part 100 and a magnetic component group 102 installed on the rotating part 100, the rotating part 100 is annular and encloses a first through hole 101 to be rotatably connected with the motor bearing. The magnetic component group 102 is arranged around the first through hole 101 to generate a magnetic field to make the rotating part 100 rotate along the axis of the first through hole 101, the magnetic component group 102 includes a first magnetic component 102a and a second magnetic component 102b, the material of the first magnetic component 102a includes neodymium iron boron magnet steel as a main magnet with good magnetic concentration ability, the material of the second magnetic component 102b includes ferrite magnet steel as a secondary magnet, and the volume V2 of the second magnetic component 102b and the volume V1 of the first magnetic component 102a satisfy the following relationship: V1<V2≤1.8V1. There is an air gap between the rotating part 100 and the fixed part 200. When the motor stator is energized, the AC electric field will react with the magnetic field of the motor rotor to generate a rotational force. In the embodiment of the present application, the second magnetic member 102b uses a relatively low-cost ferrite magnet, and at the same time, the volume of the second magnetic member 102b is increased, so that the magnetic field concentration effect is better, and the magnetic induction intensity in the motor rotor is enhanced. By increasing the volume of the ferrite magnet, the problem of insufficient magnetic field of the ferrite magnet itself is compensated, and the mechanical performance of the permanent magnet motor at high speed is met while the structure is simple and the cost is reduced.

[0056] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A motor rotor, characterized in that: The motor rotor comprises: The rotating part is annular and encloses the first through hole; A magnetic component group is arranged around the first through hole, and the magnetic component group includes a first magnetic component and a second magnetic component. The material of the first magnetic component includes neodymium iron boron magnet, the material of the second magnetic component includes ferrite magnet, and the volume V1 of the second magnetic component and the volume V2 of the first magnetic component satisfy the following relationship: V2<V1≤1.8V2.

2. The motor rotor according to claim 1, characterized in that: The length of the second magnetic component is 1-1.2 times the length of the first magnetic component, and / or the thickness of the second magnetic component is 1.2-1.5 times the thickness of the first magnetic component.

3. The motor rotor according to claim 1, characterized in that: The magnetic component group includes two second magnetic components, which are located on the side of the first magnetic component facing the first through hole, and the distance between the two second magnetic components gradually increases in the direction away from the first through hole to enclose an opening, and the first magnetic component is located in the opening.

4. The motor rotor according to claim 3, characterized in that: The motor rotor also includes a center plane, which passes through the central axis of the first through hole. In the same magnetic component group, the first magnetic component itself is symmetrically arranged about the center plane, and / or the two second magnetic components are symmetrically arranged along the center plane.

5. The motor rotor according to claim 4, characterized in that: There are a plurality of magnetic component groups, and the plurality of magnetic component groups are evenly spaced and distributed around the first through hole.

6. The motor rotor according to claim 1, characterized in that: Also includes: A hollow portion is provided along the axial direction of the rotating portion and around the first through hole, the magnetic component group is located in the hollow portion and is detachably connected to the hollow portion, and the hollow portion is adapted to the size of the magnetic component group.

7. The motor rotor according to claim 6, characterized in that: The rotating part further includes a weight-reducing hole which penetrates the rotating part axially.

8. The motor rotor according to claim 7, characterized in that: The plurality of weight-reducing holes are arranged at equal intervals around the first through hole.

9. A permanent magnet motor, characterized in that: It includes the motor rotor as described in any one of claims 1-8, the permanent magnet motor also includes a motor stator, the motor stator includes an annular fixed part, the fixed part encloses a second through hole, the rotating part is located in the second through hole and has an air gap with the fixed part.

10. A vehicle, characterized in that: Comprising the permanent magnet motor as claimed in claim 9.

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