A demagnetization-resistant magnetic steel structure and motor
By setting multiple grain boundary permeability zones in the magnet and adjusting the permeability of heavy rare earth elements, the problems of low anti-demagnetization ability and high cost of magnets are solved, and efficient anti-demagnetization performance and low-cost motor design are achieved.
Patent Information
- Application Number
- CN202210676632.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-06-15
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2042-06-15
AI Technical Summary
In the prior art, magnet steel has low anti-magnetization ability and high cost, and the bonding process affects the magnetic properties of magnet steel.
Using an integrally formed magnetic steel structure, multiple grain boundary permeability areas arranged in sequence along the width direction are arranged, and heavy rare earth elements are permeated. The permeability of heavy rare earth elements at different locations is adjusted according to the distribution of the motor magnetic field to ensure coercive force in the strong demagnetization area. Low coercive force in high and weak demagnetization areas.
It effectively improves the anti-demagnetization ability of magnetic steel, reduces the use of heavy rare earth elements and the cost of motors, and avoids the impact of the bonding process on magnetic properties.
Smart Images
Figure CN114937538B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of motors, and in particular to a demagnetization-resistant magnetic steel structure and a motor. Background Art
[0002] During the high-speed operation of the motor, the magnetic steel generates high eddy current losses, resulting in a high temperature of the magnetic steel, which is prone to irreversible demagnetization. Due to the effect of the uneven magnetic field, the position of the magnetic steel block closest to the coil is most susceptible to demagnetization and is called the strong demagnetization area. The position farthest from the coil is least susceptible to demagnetization and is called the weak demagnetization area. The transition area between the strong demagnetization area and the weak demagnetization area is called the easy demagnetization area. In order to improve the anti-demagnetization ability of the motor, high-grade high-temperature resistant and anti-demagnetization magnetic steel is generally used. However, the use of high-grade magnetic steel will greatly increase the amount of rare earth materials used in the magnetic steel and the cost of the motor. In order to reduce the amount of rare earth materials and the cost of the motor, the magnetic steel in the prior art is made by bonding magnetic steel materials of different grades. However, the magnetic steel formed by bonding magnetic steel materials of different grades has poor magnetic properties due to the influence of the bonding process. Summary of the invention
[0003] The object of the present invention is to provide a demagnetization-resistant magnetic steel structure and a motor to solve the problems of low demagnetization resistance and high cost of magnetic steel in the prior art, while avoiding the influence of the bonding process on the magnetic properties of the magnetic steel.
[0004] To achieve this object, the present invention adopts the following technical solutions:
[0005] A demagnetization-resistant magnetic steel structure, comprising:
[0006] A magnetic steel body, wherein the magnetic steel body has a plurality of grain boundary penetration regions, the grain boundary penetration regions are penetrated with heavy rare earth elements, and the plurality of grain boundary penetration regions are sequentially arranged along the width direction of the magnetic steel body;
[0007] The magnetic steel body is an integrally formed structure.
[0008] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the number of the grain boundary penetration zones is five. Along the width direction of the magnetic steel body, the five grain boundary penetration zones are respectively the first penetration zone, the second penetration zone, the third penetration zone, the fourth penetration zone and the fifth penetration zone. The sum of the width d1 of the first penetration zone, the width d2 of the second penetration zone, the width d3 of the third penetration zone, the width d4 of the fourth penetration zone and the width d5 of the fifth penetration zone is equal to the width d of the magnetic steel body.
[0009] As a preferred solution for the above-mentioned anti-demagnetization magnetic steel structure, d1 = (0 ~ 0.2) d; d2 = (0 ~ 0.3) d; d4 = (0 ~ 0.3) d; d5 = (0 ~ 0.2) d.
[0010] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the permeability of heavy rare earth elements in the first permeability zone is greater than that in the second permeability zone, the permeability of heavy rare earth elements in the second permeability zone is greater than that in the third permeability zone, the permeability of heavy rare earth elements in the fourth permeability zone is greater than that in the third permeability zone, and the permeability of heavy rare earth elements in the fifth permeability zone is greater than that in the fourth permeability zone.
[0011] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the coercive force of the magnetic steel in the first permeation zone is Hcj1, the coercive force of the magnetic steel in the second permeation zone is Hcj2, the coercive force of the magnetic steel in the third permeation zone is Hcj3, the coercive force of the magnetic steel in the fourth permeation zone is Hcj4, and the coercive force of the magnetic steel in the fifth permeation zone is Hcj5, Hcj1 = (1.2 ~ 1.3) Hcj3; Hcj2 = (1.1 ~ 1.2) Hcj3; Hcj4 = (1.1 ~ 1.2) Hcj3; Hcj5 = (1.2 ~ 1.3) Hcj3.
[0012] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the residual magnetism of the magnetic steel in the first permeation zone is Br1, the residual magnetism of the magnetic steel in the second permeation zone is Br2, the residual magnetism of the magnetic steel in the third permeation zone is Br3, the residual magnetism of the magnetic steel in the fourth permeation zone is Br4, and the residual magnetism of the magnetic steel in the fifth permeation zone is Br5; the thickness of the first permeation zone is h1, the thickness of the second permeation zone is h2, the thickness of the third permeation zone is h3, the thickness of the fourth permeation zone is h4, and the thickness of the fifth permeation zone is h5; Br1*Hcj1*d1 / h1>Br2*Hcj2*d2 / h2; Br5*Hcj5*d5 / h5>Br4*Hcj4*d1 / h4.
[0013] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the thickness of the magnetic steel body is h, h1≤h; h2≤h; h3≤h; h4≤h; h5≤h.
[0014] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the cross-section of the magnetic steel body is rectangular.
[0015] As a preferred solution of the above-mentioned anti-demagnetization magnetic steel structure, the heavy rare earth element is terbium or dysprosium.
[0016] The present invention also provides a motor, comprising the above-mentioned anti-demagnetization magnetic steel structure.
[0017] Beneficial effects of the present invention:
[0018] The present invention provides a magnetic steel structure and a motor that resists demagnetization. The magnetic steel structure resists demagnetization by integral molding, without the need for bonding connection, can avoid the influence of bonding process on the magnetic properties of the magnetic steel. In addition, the magnetic steel body is provided with a plurality of grain boundary penetration areas infiltrated with heavy rare earth elements. According to the distribution of the magnetic field of the motor, grain boundary penetration areas with different penetration amounts of heavy rare earth elements are provided at different positions of the magnetic steel body, ensuring that the coercive force of the magnetic steel in the strong demagnetization area is high and the coercive force of the magnetic steel in the weak demagnetization area is low, which can reduce the amount of heavy rare earth elements and the cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a structural schematic diagram of a demagnetization-resistant magnetic steel structure provided by a specific embodiment of the present invention along a first viewing angle;
[0020] Figure 2 is a structural schematic diagram of a demagnetization-resistant magnetic steel structure provided by a specific embodiment of the present invention along a second viewing angle;
[0021] Figure 3 It is a structural schematic diagram of an anti-demagnetization magnetic steel structure provided by a specific embodiment of the present invention installed in a motor.
[0022] In the figure:
[0023] 1. The first permeation zone; 2. The second permeation zone; 3. The third permeation zone; 4. The fourth permeation zone; 5. The fifth permeation zone. DETAILED DESCRIPTION
[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0027] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying 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 invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0028] The present invention provides a magnetic steel structure that resists demagnetization, such as Figure 1-3 As shown, the anti-demagnetization magnetic steel structure includes a magnetic steel body, the magnetic steel body has a plurality of grain boundary penetration zones, the grain boundary penetration zones are infiltrated with heavy rare earth elements, and the plurality of grain boundary penetration zones are sequentially arranged along the width direction of the magnetic steel body; the magnetic steel body is an integrally formed structure. The anti-demagnetization magnetic steel structure adopts an integral forming method, and does not need to adopt an adhesive connection method, which can avoid the influence of the adhesive process on the magnetic properties of the magnetic steel. Moreover, the magnetic steel body is provided with a plurality of grain boundary penetration zones infiltrated with heavy rare earth elements. According to the distribution of the magnetic field of the motor, grain boundary penetration zones with different penetration amounts of heavy rare earth elements are arranged at different positions of the magnetic steel body, so as to ensure that the coercive force of the magnetic steel in the strong penetration area is high and the coercive force of the magnetic steel in the weak penetration area is low, thereby reducing the amount of heavy rare earth elements and the cost of the motor. Optionally, the heavy rare earth element is terbium or dysprosium. Optionally, the cross-section of the magnetic steel body is rectangular.
[0029] Optionally, the number of grain boundary permeation zones is not less than three, and the shape of the grain boundary permeation zones may be rectangular, triangular, etc. The optimal effect of anti-demagnetization capability is achieved by matching grain boundary permeation zones of different numbers and shapes.
[0030] In this embodiment, Figure 1 and Figure 2As shown, there are five grain boundary permeation zones, and along the width direction of the magnetic steel body, the five grain boundary permeation zones are the first permeation zone 1, the second permeation zone 2, the third permeation zone 3, the fourth permeation zone 4 and the fifth permeation zone 5, respectively. The sum of the width d1 of the first permeation zone 1, the width d2 of the second permeation zone 2, the width d3 of the third permeation zone 3, the width d4 of the fourth permeation zone 4 and the width d5 of the fifth permeation zone 5 is equal to the width d of the magnetic steel body. The five grain boundary permeation zones completely cover the magnetic steel body to enhance the overall anti-demagnetization capability of the anti-demagnetization magnetic steel structure.
[0031] Optionally, d1 = (0-0.2) d; d2 = (0-0.3) d; d4 = (0-0.3) d; d5 = (0-0.2) d. The width of the first permeability zone 1 and the width of the fifth permeability zone 5 are both 0-0.2 times the width of the magnetic steel body, and the width of the first permeability zone 1 and the width of the fifth permeability zone 5 may be equal or unequal; the width of the second permeability zone 2 and the width of the fourth permeability zone 4 are both 0-0.3 times the width of the magnetic steel body, and the width of the second permeability zone 2 and the width of the fourth permeability zone 4 may be equal or unequal. Optionally, the length of the grain boundary permeability zone is equal to the length of the magnetic steel body.
[0032] Optionally, the heavy rare earth element permeation amount of the first permeation zone 1 is greater than that of the second permeation zone 2, the heavy rare earth element permeation amount of the second permeation zone 2 is greater than that of the third permeation zone 3, the heavy rare earth element permeation amount of the fourth permeation zone 4 is greater than that of the third permeation zone 3, and the heavy rare earth element permeation amount of the fifth permeation zone 5 is greater than that of the fourth permeation zone 4. The required coercive force of each grain boundary permeation zone decreases step by step from the outside to the inside, and the heavy rare earth element permeation amount also decreases step by step. The first permeation zone 1 and the fifth permeation zone have the largest permeation amount of heavy rare earth elements, the second permeation zone 2 and the fourth permeation zone have the second largest permeation amount of heavy rare earth elements, and the third permeation zone 3 has the least permeation amount of heavy rare earth elements.
[0033] Optionally, the magnetic steel coercivity of the first permeability zone 1 is Hcj1, the magnetic steel coercivity of the second permeability zone 2 is Hcj2, the magnetic steel coercivity of the third permeability zone 3 is Hcj3, the magnetic steel coercivity of the fourth permeability zone 4 is Hcj4, the magnetic steel coercivity of the fifth permeability zone 5 is Hcj5, the magnetic steel remanence of the first permeability zone 1 is Br1, the magnetic steel remanence of the second permeability zone 2 is Br2, the magnetic steel remanence of the third permeability zone 3 is Br3, the magnetic steel remanence of the fourth permeability zone 4 is Br4, and the magnetic steel remanence of the fifth permeability zone 5 is Br5; the thickness of the first permeability zone 1 is h1, The thickness of the second permeation zone 2 is h2, the thickness of the third permeation zone 3 is h3, the thickness of the fourth permeation zone 4 is h4, and the thickness of the fifth permeation zone 5 is h5; Hcj1=(1.2~1.3)Hcj3; Hcj2=(1.1~1.2)Hcj3; Hcj4=(1.1~1.2)Hcj3; Hcj5=(1.2~1.3)Hcj3; Br1*Hcj1*d1 / h1>Br2*Hcj2*d2 / h2; Br5*Hcj5*d5 / h5>Br4*Hcj4*d1 / h4. According to the requirements of the magnetic coercive force and magnetic remanence of each grain boundary penetration zone, combined with the relationship between the magnetic coercive force, magnetic remanence, the width of the grain boundary penetration zone and the thickness of the grain boundary penetration zone, the width and thickness of each grain boundary penetration zone are optimized to achieve customized design so that the anti-demagnetization ability of the anti-demagnetization magnetic steel structure is optimized and the cost is minimized.
[0034] On the premise of not changing the magnetic steel brand, according to the relationship of Br1*Hcj1*d1 / h1>Br2*Hcj2*d2 / h2; Br5*Hcj5*d5 / h5>Br4*Hcj4*d1 / h4 and Hcj1=(1.2~1.3)Hcj3; Hcj2=(1.1~1.2)Hcj3; Hcj4=(1.1~1.2)Hcj3; Hcj5=(1.2~1.3)Hcj3, after determining the values of the magnetic steel coercive force and the magnetic steel remanence, set different widths and thicknesses of the grain boundary penetration zone, and perform demagnetization verification. By adjusting the magnetic steel coercive force, magnetic steel remanence, the width of the grain boundary penetration zone and the thickness of the grain boundary penetration zone, it is ensured that the motor has no demagnetization risk.
[0035] According to the relationship of Br1*Hcj1*d1 / h1>Br2*Hcj2*d2 / h2; Br5*Hcj5*d5 / h5>Br4*Hcj4*d1 / h4 and Hcj1=(1.2~1.3)Hcj3; Hcj2=(1.1~1.2)Hcj3; Hcj4=(1.1~1.2)Hcj3; Hcj5=(1.2~1.3)Hcj3, the width and thickness of each grain boundary penetration zone can be quickly designed to match each other, ultimately achieving the optimal anti-demagnetization performance and the lowest cost.
[0036] Optionally, the thickness of the magnetic steel body is h, h1≤h; h2≤h; h3≤h; h4≤h; h5≤h.
[0037] The present invention also provides a motor, comprising the above-mentioned anti-demagnetization magnetic steel structure. The motor can reduce the amount of heavy rare earth elements used, has low cost, and can quickly carry out matching design of the width and thickness of each grain boundary penetration zone of the anti-demagnetization magnetic steel structure, so as to achieve the best anti-demagnetization performance and minimize the cost.
[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.
Claims
1. A magnetic steel structure that resists demagnetization, characterized in that: include: A magnetic steel body, wherein the magnetic steel body has a plurality of grain boundary penetration regions, the grain boundary penetration regions are penetrated with heavy rare earth elements, and the plurality of grain boundary penetration regions are sequentially arranged along the width direction of the magnetic steel body; The magnetic steel body is an integrally formed structure; The number of the grain boundary permeation zones is five. Along the width direction of the magnetic steel body, the five grain boundary permeation zones are the first permeation zone (1), the second permeation zone (2), the third permeation zone (3), the fourth permeation zone (4) and the fifth permeation zone (5) in sequence. The sum of the width d1 of the first permeation zone (1), the width d2 of the second permeation zone (2), the width d3 of the third permeation zone (3), the width d4 of the fourth permeation zone (4) and the width d5 of the fifth permeation zone (5) is equal to the width d of the magnetic steel body. The magnetic steel coercivity of the first permeation zone (1) is Hcj1, the magnetic steel coercivity of the second permeation zone (2) is Hcj2, the magnetic steel coercivity of the third permeation zone (3) is Hcj3, the magnetic steel coercivity of the fourth permeation zone (4) is Hcj4, and the magnetic steel coercivity of the fifth permeation zone (5) is Hcj5, Hcj1 = (1.2 to 1.3) Hcj3; Hcj2 = (1.1 to 1.2) Hcj3; Hcj4 = (1.1 to 1.2) Hcj3; Hcj5 = (1.2 to 1.3) Hcj3; The magnetic steel remanence of the first permeability zone (1) is Br1, the magnetic steel remanence of the second permeability zone (2) is Br2, the magnetic steel remanence of the third permeability zone (3) is Br3, the magnetic steel remanence of the fourth permeability zone (4) is Br4, and the magnetic steel remanence of the fifth permeability zone (5) is Br5; the thickness of the first permeability zone (1) is h1, the thickness of the second permeability zone (2) is h2, the thickness of the third permeability zone (3) is h3, the thickness of the fourth permeability zone (4) is h4, and the thickness of the fifth permeability zone (5) is h5; Br1*Hcj1*d1 / h1>Br2*Hcj2*d2 / h2; Br5*Hcj5*d5 / h5>Br4*Hcj4*d1 / h4.
2. The anti-demagnetization magnetic steel structure according to claim 1, characterized in that: d1=(0~0.2)d; d2=(0~0.3)d; d4=(0~0.3)d; d5=(0~0.2)d.
3. The anti-demagnetization magnetic steel structure according to claim 1, characterized in that: The permeability of heavy rare earth elements in the first permeability zone (1) is greater than that in the second permeability zone (2), the permeability of heavy rare earth elements in the second permeability zone (2) is greater than that in the third permeability zone (3), the permeability of heavy rare earth elements in the fourth permeability zone (4) is greater than that in the third permeability zone (3), and the permeability of heavy rare earth elements in the fifth permeability zone (5) is greater than that in the fourth permeability zone (4).
4. The anti-demagnetization magnetic steel structure according to claim 1, characterized in that: The thickness of the magnetic steel body is h, h1≤h; h2≤h; h3≤h; h4≤h; h5≤h.
5. The anti-demagnetization magnetic steel structure according to claim 1, characterized in that: The cross section of the magnetic steel body is rectangular.
6. The anti-demagnetization magnetic steel structure according to claim 1, characterized in that: The heavy rare earth element is terbium or dysprosium.
7. A motor, characterized in that: A demagnetization-resistant magnetic steel structure comprising any one of claims 1-6.
Citation Information
Patent Citations
Magnetic stabilization method of permanent magnet, magnetic stabilization permanent magnet and permanent magnet motor
CN112714802A