Magnetic gathering type tangential rotor structure capable of preventing permanent magnet corners from losing magnetism

Abstract

The utility model relates to a magnetism gathering type tangential rotor structure capable of preventing permanent magnet corners from losing magnetism, which comprises a rotor iron core, a rotor shaft is arranged in the middle of the rotor iron core, permanent magnets are arranged on the periphery of the rotor shaft, and the rotor iron core is composed of a plurality of iron core corners and an iron core inner ring. The iron core inner ring is positioned in the middle of the rotor iron core; a plurality of iron core angles are uniformly distributed on the periphery of the iron core inner ring; the iron core angle is fan-shaped, the top of the iron core angle is an outer magnetic bridge, the bottom is a connecting rib, and the connecting rib is connected with the outer circumferential surface of the iron core inner ring. According to the utility model, a plurality of permanent magnet arc-shaped chamfers are arranged, the permanent magnets adopt inverted trapezoidal groove structures, and corresponding concave arc-shaped anti-demagnetization protection grooves and trapezoidal positioning bulges are arranged on the rotor iron core, so that the transition between the permanent magnets and the rotor iron core is smoother, the distortion and aggregation of magnetic lines of force are reduced, and the magnetic field intensity of corners of the permanent magnets is reduced; the irreversible excitation loss of the permanent magnet caused by a demagnetizing magnetic field is effectively avoided, and the demagnetizing risk of the permanent magnet is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology and relates to a magnetically focused tangential rotor structure that can prevent demagnetization at the edges and corners of permanent magnets. Background Technology

[0002] With the development of industrial manufacturing and technology, permanent magnet synchronous motors have broad application prospects and market potential due to their high efficiency, high power density, and high reliability. Their applications include electric vehicles, medical equipment, aerospace, home appliances, and robotics. Tangential rotor structures, due to their magnetic focusing effect, result in high torque density and are used in many applications. However, this same magnetic focusing effect leads to high magnetic load, which significantly demagnetizes the permanent magnets, easily causing irreversible demagnetization at the edges and corners of the permanent magnets, resulting in a decrease or continuous deterioration of the motor's output torque.

[0003] The existing tangential rotor structure with a magnetic focusing mechanism involves inserting a rectangular permanent magnet into the iron core slot, while simultaneously breaking the magnetic bridge surrounding the permanent magnet and installing an internal magnetic isolation bridge. However, at the corners of the permanent magnet where it directly contacts the iron core, the magnetic lines of force are easily distorted and concentrated, resulting in a very significant demagnetizing effect on the permanent magnet and potentially causing irreversible demagnetization at the corners of the permanent magnet. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetically focused tangential rotor structure that can prevent the permanent magnet from losing magnetism at the corners, thus solving the above-mentioned problems and making it less likely for the permanent magnet to slip out.

[0005] According to the technical solution provided by this utility model: a magnetically focused tangential rotor structure that can prevent demagnetization of the edges and corners of permanent magnets includes a rotor core, a rotor shaft installed in the middle of the rotor core, permanent magnets provided on the outer periphery of the rotor shaft, and the rotor core consisting of several core corners and an inner ring; the inner ring is located in the middle of the rotor core, and several core corners are evenly distributed on the outer periphery of the inner ring; the core corners are fan-shaped, with an outer magnetic bridge at the top and a connecting rib at the bottom, the connecting rib being connected to the outer circumferential surface of the inner ring; a first positioning protection groove and a second positioning protection groove are symmetrically opened on both sides of the core corners; the extension section between the first positioning protection groove and the second positioning protection groove forms a permanent magnet positioning protrusion; the first positioning protection groove... The inner magnetic bridge is located between the connecting ribs; a circular rivet hole is provided in the middle of the iron core corner; the first positioning protection groove near the end of the inner magnetic bridge and the second positioning protection groove near the end of the outer magnetic bridge are provided with concave arc-shaped anti-demagnetization first chamfer; the trapezoidal positioning protrusion is trapezoidal in shape, and anti-demagnetization third chamfer and anti-demagnetization second chamfer are provided at its top and bottom ends respectively; the middle of the permanent magnet has two concave parts on both sides, and the two sides are the first protruding end and the second protruding end; the concave part is an inverted trapezoidal groove; the outer ends of the first protruding end and the second protruding end are provided with the first chamfer of the permanent magnet, and the concave part and the first protruding end and the second protruding end are connected by the second chamfer of the permanent magnet, and the bottom of the concave part is provided with the third chamfer of the permanent magnet.

[0006] As a further improvement of this utility model, several iron core corners are radially and uniformly distributed on the outer circumferential surface of the inner ring of the iron core.

[0007] As a further improvement of this utility model, the number of iron core angles is equal to the number of poles of the motor rotor.

[0008] As a further improvement of this utility model, the inner ring of the iron core has a ring-shaped structure, and its interior fits with the circumferential surface of the rotor shaft.

[0009] As a further improvement of this utility model, the length of the concave portion should account for 1 / 2 to 2 / 3 of the total length of the permanent magnet.

[0010] As a further improvement of this utility model, the first chamfer, the second chamfer, and the third chamfer of the permanent magnet are arc-shaped.

[0011] As a further improvement of this utility model, two adjacent iron core corners form a magnet cavity, in which a permanent magnet is placed; the first protruding end of the permanent magnet is located in the first positioning protection groove of the two adjacent iron core corners, and is restricted and locked from both ends by the inner magnetic bridge and the positioning protrusion respectively; the permanent magnet positioning protrusion on the rotor iron core extends into the concave part of the permanent magnet and cooperates with it; the second protruding end of the permanent magnet is located in the second positioning protection groove of the two adjacent iron core corners, and is restricted and locked from both ends by the outer magnetic bridge and the positioning protrusion respectively.

[0012] As a further improvement of this utility model, the concave arc-shaped anti-demagnetization first chamfer on the rotor core fits well with the permanent magnet first chamfer at the outer contour corner of the permanent magnet; the trapezoidal positioning protrusion on the rotor core extends into the concave part with the inverted trapezoidal groove and cooperates with it; the anti-demagnetization third chamfer and anti-demagnetization second chamfer located on the trapezoidal positioning protrusion fit with the permanent magnet third chamfer and arc-shaped second chamfer at the bottom of the concave part, respectively.

[0013] The positive and progressive effects of this application are as follows:

[0014] This invention features multiple curved chamfers on the permanent magnets, an inverted trapezoidal groove structure on the permanent magnets, and corresponding concave arc-shaped anti-demagnetization protection grooves and trapezoidal positioning protrusions on the rotor core. These features create a smoother transition between the permanent magnets and the rotor core, reducing magnetic field distortion and concentration, lowering the magnetic field strength at the corners of the permanent magnets, and effectively preventing irreversible demagnetization due to the demagnetizing magnetic field, thus reducing the risk of demagnetization. Simultaneously, it also provides positioning protection, preventing the permanent magnets from slipping out. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the rotor core of this utility model.

[0017] Figure 3 for Figure 2 An enlarged schematic diagram of region A in the middle.

[0018] Figure 4 This is a schematic diagram of the permanent magnet structure of this utility model.

[0019] Figure 5 Magnetic field intensity distribution of the rectangular permanent magnet before improvement.

[0020] Figure 6 This utility model presents a magnetic field strength distribution diagram of a permanent magnet. Detailed Implementation

[0021] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0024] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.

[0025] like Figure 1As shown, this utility model is a magnetically focused tangential rotor structure that can prevent the corners of permanent magnets from losing magnetism. It includes a rotor core 18, a rotor shaft 19 installed in the middle of the rotor core 18, and permanent magnets 20 provided on the outer periphery of the rotor shaft 19.

[0026] like Figure 2 As shown, the rotor core 18 consists of several core corners 21 and an inner core ring 7. The inner core ring 7 is located in the middle of the rotor core 18, and several core corners 21 are evenly distributed on the outer circumference of the inner core ring 7. Specifically, the several core corners 21 are radially and evenly distributed on the outer circumferential surface of the inner core ring 7.

[0027] Each core corner 21 includes an outer magnetic bridge 1, a first positioning protection groove 2, a second positioning protection groove 3, an inner magnetic bridge 4, a rivet hole 5, a connecting rib 6, and a permanent magnet positioning protrusion 8. The number of core corners 21 is equal to the number of poles of the motor rotor.

[0028] The inner ring 7 of the iron core has a ring-shaped structure, which fits with the circumferential surface of the rotor shaft 19 and can transmit torque through the rotor shaft.

[0029] The core corner 21 is fan-shaped, with an outer magnetic bridge 1 at the top and a connecting rib 6 at the bottom, which is connected to the outer circumferential surface of the inner ring 7 of the core. A first positioning protection groove 2 and a second positioning protection groove 3 are symmetrically formed on both sides of the core corner 21. The extension between the first and second positioning protection grooves 2 and 3 forms a permanent magnet positioning protrusion 8. An inner magnetic bridge 4 is located between the first positioning protection groove 2 and the connecting rib 6. A circular rivet hole 5 is provided in the middle of the core corner 21. The rivet hole 5 is positioned as close as possible to the connecting rib 6 while ensuring the strength of the rotor structure, which can reduce eddy current losses on the rivet to a certain extent. Simultaneously, to reduce rotor leakage flux, the widths of the connecting rib 6, the inner magnetic bridge 4, and the outer magnetic bridge 1 should be minimized while ensuring the strength of the rotor structure.

[0030] like Figure 3 As shown, the first positioning protection groove 2 near the end of the inner magnetic bridge 4 and the second positioning protection groove 3 near the end of the outer magnetic bridge 1 are provided with concave arc-shaped anti-demagnetization first chamfer 9.

[0031] The trapezoidal positioning protrusion 8 is trapezoidal in shape, with a third anti-demagnetization chamfer 101 and a second anti-demagnetization chamfer 10 at its top and bottom ends, respectively.

[0032] like Figure 4As shown, the permanent magnet 20 has two concave portions 17 in the middle, and two protruding ends 12 and 14 on the sides. The length of the concave portion 17 should account for 1 / 2 to 2 / 3 of the total length of the permanent magnet 20. The concave portion 17 is an inverted trapezoidal groove. The outer ends of the first protruding ends 12 and 14 are provided with a first chamfer 11 of the permanent magnet. The concave portion 17 is connected to the first protruding ends 12 and 14 by a second chamfer of the permanent magnet. The bottom of the concave portion 17 is provided with a third chamfer 16 of the permanent magnet on both sides.

[0033] The first chamfer 11, the second chamfer, and the third chamfer 16 of the permanent magnet are arc-shaped.

[0034] Two adjacent iron core corners 21 form a magnet cavity, in which a permanent magnet 20 is placed. The magnet cavity is used to reduce the passage of magnetic lines of force and reduce magnetic leakage. The first protruding end 12 of the permanent magnet 20 is located in the first positioning protection groove 2 of the two adjacent iron core corners 21 and is restricted and locked from both ends by the inner magnetic bridge 4 and the positioning protrusion 8, respectively. The permanent magnet positioning protrusion 8 on the rotor iron core 18 extends into the concave portion 17 of the permanent magnet 20 and cooperates with it. The second protruding end 14 of the permanent magnet 20 is located in the second positioning protection groove 3 of the two adjacent iron core corners 21 and is restricted and locked from both ends by the outer magnetic bridge 1 and the positioning protrusion 8, respectively.

[0035] The concave arc-shaped anti-demagnetization first chamfer 9 on the rotor core 18 fits well with the permanent magnet first chamfer 11 at the outer contour corner of the permanent magnet 20. The trapezoidal positioning protrusion 8 on the rotor core 18 extends into the central recess 17 with an inverted trapezoidal groove and cooperates with it. The anti-demagnetization third chamfer 101 and anti-demagnetization second chamfer 10 on the trapezoidal positioning protrusion 8 fit with the permanent magnet third chamfer 16 and arc-shaped second chamfer at the bottom of the central recess 17, respectively. Therefore, a smooth transition can be achieved between the permanent magnet 20 and the rotor core 18. At the same time, the cooperation between the trapezoidal positioning protrusion 8 of the rotor core 18 and the inverted trapezoidal groove 17 of the permanent magnet 20 also plays a positioning role.

[0036] Figure 5 and Figure 6 This is a comparison diagram of the rectangular permanent magnet and the magnetic field strength distribution of the permanent magnet in a specific embodiment. It can be seen that... Figure 5 In the case of a rectangular permanent magnet, demagnetization occurs at the corners. Under the same conditions, after using the permanent magnet 20 of this invention, as shown in the figure... Figure 6 As shown, the maximum value of the magnetic field strength distribution of the permanent magnet ranges from 1.2543 × 10⁻⁶. 6 A / m decreased to 6.94×10 5 A / m effectively prevents irreversible demagnetization of permanent magnets due to demagnetizing magnetic fields.

[0037] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A magnetic concentration type tangential rotor structure capable of preventing demagnetization of the corner of a permanent magnet, comprising a rotor core (18), a rotor shaft (19) being installed in the middle of the rotor core (18), and a permanent magnet (20) being provided on the outer periphery of the rotor shaft (19), characterized in that, The rotor core (18) is composed of a plurality of core angles (21) and a core inner ring (7); the core inner ring (7) is located in the middle of the rotor core (18), and a plurality of core angles (21) are uniformly distributed on the outer circumferential surface of the core inner ring (7); the core angle (21) is fan-shaped, the top of the core angle (21) is an outer magnetic bridge (1), the bottom is a connecting rib (6), and the connecting rib (6) is connected with the outer circumferential surface of the core inner ring (7); the two side faces of the core angle (21) are symmetrically provided with a first positioning protection groove (2) and a second positioning protection groove (3); the extension section in the middle of the first positioning protection groove (2) and the second positioning protection groove (3) forms a permanent magnet positioning protrusion (8); the first positioning protection groove (2) and the connecting rib (6) are connected by an inner magnetic bridge (4); the middle of the core angle (21) is provided with a circular rivet hole (5), the end of the first positioning protection groove (2) close to the inner magnetic bridge (4) and the end of the second positioning protection groove (3) close to the outer magnetic bridge (1) are provided with concave arc-shaped anti-demagnetization first chamfers (9); the trapezoidal positioning protrusion (8) is trapezoidal as a whole, and an anti-demagnetization third chamfer (101) and an anti-demagnetization second chamfer (10) are arranged at the top end and the bottom end of the trapezoidal positioning protrusion (8) respectively; the middle two sides of the permanent magnet (20) are concave parts (17), and the two sides are a first protruding end (12) and a second protruding end (14); the concave part (17) is a reverse trapezoidal groove; the outer ends of the first protruding end (12) and the second protruding end (14) are provided with a permanent magnet first chamfer (11), the concave part (17) and the first protruding end (12) and the second protruding end (14) are connected by a permanent magnet second chamfer, and the two sides of the bottom of the concave part (17) are provided with a permanent magnet third chamfer (16).

2. The magnetic-field-gathering tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The plurality of core angles (21) are uniformly distributed in a radial manner on the outer circumferential surface of the core inner ring (7).

3. The magnetic-field-gathering tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The number of the core angles (21) is equal to the number of poles of the motor rotor.

4. The magnetic-field-gathering tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The core inner ring (7) is in a ring structure and is matched with the circumferential surface of the rotor shaft (19) internally.

5. The magnetic-field-gathering tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The length of the concave part (17) should account for 1 / 2-2 / 3 of the total length of the permanent magnet (20).

6. The magnetic-field-concentrating tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The permanent magnet first chamfer (11), the permanent magnet second chamfer and the permanent magnet third chamfer (16) are arc-shaped.

7. The magnetic-field-concentrating tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein Two adjacent core angles (21) surround a magnet cavity, and the permanent magnet (20) is placed in the magnet cavity; the first protruding end (12) of the permanent magnet (20) is located in the first positioning protection groove (2) of the two adjacent core angles (21) and is clamped and limited by the inner magnetic bridge (4) and the positioning protrusion (8) from both ends respectively; the permanent magnet positioning protrusion (8) on the rotor core (18) penetrates into the concave part (17) of the permanent magnet (20) and cooperates with the concave part (17); the second protruding end (14) of the permanent magnet (20) is located in the second positioning protection groove (3) of the two adjacent core angles (21) and is clamped and limited by the outer magnetic bridge (1) and the positioning protrusion (8) from both ends respectively.

8. The magnetic-field-concentrating tangential rotor structure capable of preventing loss of magnetism at the corners of permanent magnets according to claim 1, wherein The first anti-demagnetization chamfer (9) of the concave arc type on the rotor core (18) is better fitted with the first anti-demagnetization chamfer (11) of the permanent magnet at the outer contour edge corner; the trapezoidal positioning protrusion (8) on the rotor core (18) is deeply inserted into the middle concave part (17) with the inverted trapezoidal groove and is mutually matched with the middle concave part (17), the third anti-demagnetization chamfer (101) and the second anti-demagnetization chamfer (10) of the trapezoidal positioning protrusion (8) are respectively fitted with the third anti-demagnetization chamfer (16) and the arc-shaped second chamfer of the bottom of the middle concave part (17).

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