Rotor iron core, rotor assembly and motor using rotor iron core and rotor assembly

Abstract

The utility model discloses a rotor core, a rotor assembly and a motor using the same, comprising a central part and a plurality of magnet yoke parts, the magnet yoke parts are distributed at intervals along the circumferential direction and are arranged around the central part; a plurality of supporting core columns are formed on the central part at intervals in the circumferential direction, and the supporting core columns of the central part and the magnet yoke parts are arranged in a staggered mode. At least one supporting core column for the central part, wherein a magnetic bridge is formed at the end part of the supporting core column; two sides of at least one magnet yoke part are respectively connected with the magnetic bridges at the two adjacent supporting core columns; and a permanent magnet slot is formed between at least one pair of adjacent magnet yoke parts, so that the permanent magnet can be inserted into the slot to form a magnetic pole. The connecting structure of the magnet yoke part and the central part is higher in mechanical strength, two sections of magnetic bridges form a push-pull linkage supporting structure, severe working conditions such as frequent starting, heavy load torque output, rapid acceleration and rapid deceleration of the motor can be met, and the permanent magnet motor rotor has the characteristics of reasonable structure, low magnetic leakage, less material consumption of the rotor core, easiness in manufacturing and processing and high mechanical strength.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor rotor structure technical field, concretely is a rotor core, rotor assembly and the motor of application thereof. BACKGROUND

[0002] The motor is electromechanical equipment that can convert electric energy into mechanical energy, and its types and uses are rich and varied, among which the brushless motor is an important type of motor.

[0003] The rotor assembly is one of the core components of the motor, among which the permanent magnet type rotor assembly is widely used in the brushless motor. The Chinese utility model announcement text with the announcement number CN216056537U and the name of "rotor core and motor rotor" discloses a typical permanent magnet type rotor assembly structure.

[0004] In the prior art, in order to improve the efficiency and reduce the use of rotor core material, the V-shaped structure, U-shaped structure or multiple magnet structure scheme is usually adopted, in addition, there is also a spoke type low-cost scheme, for example, the above-mentioned Chinese utility model announcement text, that is, it is recorded that: see Figure 1-2 Among them Figure 1 is the overall view of the rotor assembly adopting the rotor core proposed in the present disclosure, Figure 2 is the sectional view of one specific embodiment of the rotor core proposed in the present disclosure. The rotor assembly can include: an injection body 14, a rotor core, a permanent magnet 12, and a rotor shaft 13. The permanent magnet 12 is embedded in the permanent magnet mounting groove 8 of the rotor core. The injection body 14 plasticizes the rotor core and the permanent magnet 12 together, and the rotor shaft 13 is located in the center shaft hole 11 of the rotor core. The rotor core includes a plurality of punched sheets, each punched sheet has a base 10 formed with a center shaft hole, and a plurality of triangular teeth 20 arranged circumferentially around the base. Among them, each triangular tooth 20 includes an outer edge 21 away from the base 10 and a tip 22 close to the base 10. The punched sheet is, for example, a silicon steel sheet. According to a preferred scheme, in all triangular teeth of the end punched sheet, at least one pair of tips of triangular teeth opposite to each other are connected to the base 10 by an inner magnetic bridge 6.

[0005] However, in order to reduce the magnetic leakage of the magnetic resistance part (i.e. the above-mentioned inner magnetic bridge 6), the mechanical structure of the magnetic resistance part is set to be very weak in the permanent magnet type rotor assembly with the above-mentioned structure. Under the working conditions of frequent starting of the motor, heavy load torque output, rapid acceleration and rapid deceleration, the mechanical strength of the rotor core is insufficient, and deformation and fracture phenomenon is easy to occur.

[0006] In summary, how to provide the rotor core with reasonable structure, low magnetic leakage, less consumption of rotor core material, easy to manufacture and process, and high mechanical strength for the motor has become a problem to be solved. UTILITY MODEL CONTENT

[0007] The purpose of the utility model is to provide a rotor core, a rotor assembly and a motor using the same, which have the characteristics of reasonable structure, low magnetic leakage, low rotor core material consumption, easy manufacturing and processing and high mechanical strength.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rotor core, comprising a central portion and a plurality of yoke portions, wherein the yoke portions are spaced apart in the circumferential direction and arranged around the central portion; the central portion is formed with a plurality of supporting core columns spaced apart in the circumferential direction, and the supporting core columns of the central portion and the yoke portions are staggered with each other; a magnetic bridge is formed at the end of at least one supporting core column of the central portion; both sides of at least one yoke portion are respectively connected to the magnetic bridges at two adjacent supporting core columns; a permanent magnet slot is formed between at least one pair of adjacent yoke portions for inserting a permanent magnet therein to form a magnetic pole.

[0009] In the above technical solution, for each supporting core column of the central part, magnetic bridges are formed on both sides of its end; for each of the yoke parts, its two sides are respectively connected to the magnetic bridges at the two adjacent supporting core columns; a permanent magnet slot is formed between each pair of adjacent yoke parts for the permanent magnet to be inserted therein to form a magnetic pole.

[0010] In the above technical solution, a first avoidance position is formed between at least one pair of adjacent support core columns; and the first avoidance position at least extends to a position that crosses the magnetic bridge.

[0011] In the above technical solution, a first space is formed between each pair of adjacent supporting core columns.

[0012] In the above technical solution, one side of the first avoidance position extends toward the yoke portion to form an arched surface.

[0013] In the above technical solution, a second space is formed inside at least one of the magnetic yoke parts.

[0014] In the above technical solution, the width of the permanent magnet slot is W1, and the width of the magnetic bridge adjacent to the permanent magnet slot is W2; then W2: W1≤1 / 3.

[0015] A rotor assembly comprises the above-mentioned rotor core.

[0016] In the above technical solution, the rotor assembly of the present invention further includes a plurality of permanent magnets; the permanent magnets are correspondingly inserted into the permanent magnet slots of the rotor core to form magnetic poles.

[0017] A motor comprises the above-mentioned rotor assembly.

[0018] Compared with the prior art, the rotor core, the rotor assembly and the motor applying the same have the advantages that the two sides of the magnetic yoke part are connected with the magnetic bridges at the positions of the two adjacent support core columns, in this way, the magnetic yoke part is supported on the outer periphery of the center part through the support core column and the two corresponding magnetic bridges; compared with the rotor core in the prior art, the connecting structure of the magnetic yoke part and the center part has higher mechanical strength, is not prone to deformation and fracture, and has higher stability and is not prone to shaking; when the motor is running, one magnetic bridge pulls the magnetic yoke part and the other magnetic bridge pushes the magnetic yoke part, the two magnetic bridges form a push-pull linkage support structure, and the linkage support structure can meet the harsh working conditions such as frequent starting of the motor, heavy load torque output, rapid acceleration and rapid deceleration; in summary, the rotor core, the rotor assembly and the motor applying the same have the characteristics of reasonable structure, low magnetic leakage, less rotor core material consumption, easy manufacturing and processing and high mechanical strength. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is one of the structure views of the rotor core in the utility model.

[0020] Figure 2 It is the second structure view of the rotor core in the utility model.

[0021] Figure 3 It is the structure view of the rotor assembly in the utility model.

[0022] Figure 4 It is the magnetic field simulation test view of the utility model.

[0023] The reference signs are: 1, rotor core; 11, center part; 12, magnetic yoke part; 13, support core column; 14, magnetic bridge; 15, permanent magnet slot; 16, first empty position; 161, arched surface; 17, second empty position; 2, permanent magnet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] The embodiment provides a rotor core which can be applied in a motor and used as a mechanical structure support base component and a magnetic conducting component of a rotor assembly.

[0026] The rotor core 1 has good magnetic conductivity and can be a metal body formed by stacking a number of silicon steel sheets, or a solid metal body formed by integral die-casting or machining.

[0027] See also Figure 1 and Figure 2 The rotor core 1 of this embodiment includes a central portion 11 and a plurality of yoke portions 12, wherein the central portion 11 is roughly annular in structure, and the yoke portions 12 are roughly petal-shaped in structure; the yoke portions 12 are spaced apart along the circumferential direction and arranged around the central portion 11. In this embodiment, the yoke portions 12 are evenly distributed along the circumferential direction, and 8 yoke portions are provided.

[0028] In order to provide a reliable mechanical connection structure between the center portion 11 and the yoke portion 12 and reduce magnetic leakage of the mechanical connection structure, the rotor core 1 of this embodiment is configured as follows:

[0029] The central portion 11 is formed with a plurality of support core columns 13 spaced apart along the circumferential direction, and the support core columns 13 of the central portion 11 are staggered with the yoke portion 12 , that is, a support core column 13 is provided between each pair of adjacent yoke portions 12 of the central portion 11 .

[0030] At least one supporting stem 13 of the central portion 11 has a magnetic bridge 14 formed at its end.

[0031] For at least one yoke portion 12 , two sides thereof are respectively connected to the magnetic bridges 14 at two adjacent supporting core legs 13 .

[0032] A permanent magnet slot 15 is formed between at least one pair of adjacent yoke parts 12 for inserting the permanent magnet 2 therein to form a magnetic pole.

[0033] In this embodiment, for each supporting core column 13 of the central portion 11, magnetic bridges 14 are formed on both sides of its end portion; for each yoke portion 12, its two sides are respectively connected to the magnetic bridges 14 at two adjacent supporting core columns 13; a permanent magnet slot 15 is formed between each pair of adjacent yoke portions 12 for the permanent magnet 2 to be inserted therein to form a magnetic pole.

[0034] It can be understood that the central portion 11, the yoke portion 12, the supporting core column 13 and the magnetic bridge 14 of the rotor core 1 are all integrally formed structural features, and the central portion 11, the yoke portion 12, the supporting core column 13 and the magnetic bridge 14 can be obtained by punching, machining or integral die-casting, and the permanent magnet slot 15 is a groove-shaped structure naturally obtained after the various structural features of the rotor core 1 are formed; in this way, each yoke portion 12 can be supported on the outer periphery of the central portion 11 through the supporting core column 13 and the corresponding two-section magnetic bridge 14.

[0035] Furthermore, a first clearance position 16 is formed between at least one pair of adjacent supporting core columns 13, and the first clearance position 16 extends at least to a position that crosses the magnetic bridge 14. Specifically, one side of the first clearance position 16 extends in the direction of the yoke portion 12 and extends at least to a position that crosses the magnetic bridge 14. In this embodiment, a first clearance position 16 is formed between each pair of adjacent supporting core columns 13. In fact, the first clearance position 16 is a slot-shaped structure integrally formed in the rotor core 1, which can be obtained by punching, machining or integral die-casting.

[0036] Furthermore, one side of the first clearance portion 16 extends toward the yoke portion 12 to form an arched surface 161 . That is, one side of the first clearance portion 16 close to the yoke portion 12 is configured as the arched surface 161 .

[0037] Furthermore, for at least one yoke portion 12, a second air avoidance space 17 is formed inside it. In this embodiment, the cross-section of the second air avoidance space 17 is long and strip-shaped and is located in the center of the yoke portion 12 to separate the yoke portion 12 into two halves; in fact, the second air avoidance space 17 is a slot-shaped structure integrally formed in the rotor core 1, which can be obtained by punching, machining or integral die-casting.

[0038] It can be understood that the first avoidance space 16 and the second avoidance space 17 both function as “air gaps” during the magnetic field guidance process.

[0039] Furthermore, the width of the permanent magnet slot 15 is W1, and the width of the magnetic bridge 14 adjacent to the permanent magnet slot 15 is W2, then W2:W1≤1 / 3; the width W2 of the magnetic bridge 14 is set at this ratio. Compared with the single magnetic bridge in the prior art, the width W2 of the magnetic bridge 14 in this embodiment can be greatly reduced, but higher mechanical strength can be obtained to ensure a safe structure for high-speed operation. Therefore, while meeting the mechanical strength requirements, the rotor assembly effectively reduces the leakage magnetic phenomenon at the magnetic bridge 14, thereby improving the motor efficiency.

[0040] See also Figure 3 This embodiment also provides a rotor assembly, which includes the above-mentioned rotor core 1.

[0041] The rotor assembly of this embodiment also includes a plurality of permanent magnets 2, wherein the permanent magnets 2 are made of neodymium iron boron or ferrite and have permanent magnetism; in this embodiment, the permanent magnets 2 are square sheet structures (also called "magnetic tiles"), and their magnetic poles are located on the two surfaces with the largest surface area, and can generate a magnetic field outward from these two surfaces; the permanent magnets 2 are correspondingly inserted into the permanent magnet slots 15 of the rotor core 1 to form magnetic poles. In this embodiment, four permanent magnets 2 are respectively inserted into each permanent magnet slot 15 of the rotor core 1 in a stacked manner.

[0042] It can be understood that, after the permanent magnet 2 is inserted into the permanent magnet slot 15 of the rotor core 1, the rotor assembly as a whole can be placed into an injection mold, so that the rotor assembly is plastic-coated, and the rotor core 1 and the permanent magnet 2 are fixed as a whole.

[0043] The embodiment also provides a motor comprising the rotor assembly.

[0044] Please refer to Figure 4 From the perspective of magnetic guide characteristics, it can be known that:

[0045] 1. Since the widths of the support core column 13 and the magnetic bridge 14 are small, the magnetic field generated by the permanent magnet 2 will cause the support core column 13 and the magnetic bridge 14 to be magnetically saturated when the magnetic field passes through the support core column 13 and the magnetic bridge 14, so that more magnetic fields are difficult to pass through, thereby reducing the magnetic leakage phenomenon of the magnetic field at the support core column 13 and the magnetic bridge 14, and most of the magnetic field is introduced into the magnetic yoke part 12 and participates in the output process of the motor, thereby effectively improving the efficiency of the motor.

[0046] 2. The first empty position 16 arranged at the rotor core 1 can generate a magnetic aggregation effect. Specifically, the magnetic field generated by the permanent magnet 2 generates a salient pole effect by the guidance of the first empty position 16, so that the magnetic field is further introduced into the magnetic yoke part 12 and participates in the output process of the motor, thereby further improving the efficiency of the motor.

[0047] 3. The arched surface 161 arranged at the first empty position 16 makes the center of the magnetic yoke part 12 have a higher magnetic field strength, can simulate a sinusoidal magnetic field, thereby improving the positive limit of the rotor assembly and optimizing the electromagnetic noise of the motor.

[0048] 4. The second empty position 17 arranged at the rotor core 1 can provide an air gap between the two adjacent permanent magnets 2, so as to avoid the magnetic fields generated by the two adjacent permanent magnets 2 from interfering with each other.

[0049] In addition, the first empty position 16 arranged at the rotor core 1 can also form an air flow channel in the rotor core 1 (air flow can pass through the rotor core 1 along the first empty position 16), thereby improving the heat exchange area of the air flow and the rotor core 1, so as to improve the heat dissipation performance of the rotor assembly.

[0050] However, the technical effects of the rotor core, the rotor assembly and the motor applying the same of the embodiment are not limited to the above content, and more importantly:

[0051] The two sides of the yoke part 12 are respectively connected to the magnetic bridges 14 at the two adjacent supporting core columns 13. In this way, the yoke part 12 is supported on the outer periphery of the center part 11 through the supporting core columns 13 and the corresponding two magnetic bridges 14. Compared with the rotor core 1 in the prior art, the connection structure between the yoke part 12 and the center part 11 of this embodiment has higher mechanical strength, is not prone to deformation and breakage, and has higher stability and is not prone to shaking. When the motor is running, one section of the magnetic bridge 14 pulls the yoke part 12, and the other section of the magnetic bridge 14 pushes the yoke part 12. The two sections of the magnetic bridge 14 form a push-pull linkage support structure, which can meet the harsh working conditions such as frequent motor starting, heavy-load torque output, rapid acceleration and rapid deceleration. In summary, the rotor core 1, the rotor assembly and the motor using the same in this embodiment have the characteristics of reasonable structure, low magnetic leakage, low material consumption of the rotor core 1, easy manufacturing and processing, and high mechanical strength.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor core comprising a central portion and a plurality of yoke portions, wherein the yoke portions are spaced apart in a circumferential direction and arranged around the central portion; It is characterized by: The central portion is formed with a plurality of support core columns spaced apart along the circumferential direction, and the support core columns of the central portion and the magnetic yoke portion are staggered with each other; At least one supporting core leg of the central portion has a magnetic bridge formed at its end; For at least one of the magnetic yoke parts, two sides thereof are respectively connected to the magnetic bridges at two adjacent support core columns; A permanent magnet slot is formed between at least one pair of adjacent yoke parts for inserting a permanent magnet therein to form a magnetic pole.

2. The rotor core according to claim 1, wherein: For each supporting core column of the central portion, magnetic bridges are formed on both sides of its end portion; For each of the magnetic yoke parts, two sides thereof are respectively connected to the magnetic bridges at two adjacent supporting core columns; A permanent magnet slot is formed between each pair of adjacent yoke parts for inserting a permanent magnet therein to form a magnetic pole.

3. The rotor core according to claim 1 or 2, characterized in that: A first escape space is formed between at least one pair of adjacent support core columns; Furthermore, the first clearance position at least extends to a position that exceeds the magnetic bridge.

4. The rotor core according to claim 3, characterized in that: A first avoidance space is formed between each pair of adjacent supporting core columns.

5. The rotor core according to claim 3, characterized in that One side of the first avoidance portion extends toward the yoke portion to form an arched surface.

6. The rotor core according to claim 1, wherein: At least one of the yoke parts has a second space therein.

7. The rotor core according to claim 1, wherein: The width of the permanent magnet slot is W1, and the width of the magnetic bridge adjacent to the permanent magnet slot is W2; Then W2:W1≤1 / 3.

8. A rotor assembly, characterized in that: The invention comprises the rotor core described in any one of claims 1 to 7.

9. The rotor assembly according to claim 8, wherein: Also included are several permanent magnets; The permanent magnets are correspondingly inserted into the permanent magnet slots of the rotor core to form magnetic poles.

10. A motor, characterized in that: Comprising the rotor assembly according to claim 8 or 9.

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