High-strength magnetism gathering type tangential rotor structure

Abstract

The invention relates to a high-strength magnetism gathering type tangential rotor structure which comprises a rotor core, a rotor shaft is installed in the middle of the rotor core, permanent magnets are arranged on the periphery of the rotor shaft, and the rotor core is composed of a plurality of iron core angles 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; a first positioning protection groove and a second positioning protection groove are symmetrically formed in the two side faces of the iron core angle, and permanent magnet positioning protrusions are formed in the extending sections between the first positioning protection groove and the second positioning protection groove. And an inner magnetic bridge is arranged between the first positioning protection groove and the connecting rib. The thickness and the length of the outer magnetic isolation bridge and the inner magnetic isolation bridge can be properly reduced, magnetic leakage is reduced, and the torque and the efficiency of the motor are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy permanent magnet synchronous motors and relates to a high-strength magnetic concentrating tangential rotor structure. Background Art

[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 application areas include electric vehicles, medical equipment, aerospace, home appliances, robots, etc. The rotor structure of permanent magnet synchronous motors is divided into surface type, built-in radial type, built-in tangential type, etc. The tangential rotor structure (according to the magnetization direction of the permanent magnet 16) has a high torque density due to its magnetic concentration effect, and has been used in many occasions. However, its low rotor mechanical strength and serious magnetic leakage have become problems that need to be solved urgently.

[0003] There is a magnetic concentrating tangential rotor structure, in which the permanent magnet 16 is directly inserted into the core slot, and the core completely wraps the permanent magnet 16. In this structure, a large number of magnetic lines of force can directly form a loop through the core without entering the stator. The magnetic leakage is very serious, resulting in problems such as low motor output torque and low efficiency.

[0004] There are also patents that disconnect the magnetic bridge that wraps the outside of the permanent magnet 16, and set an internal magnetic bridge. However, in order to ensure the strength of the rotor core 15 structure, the thickness and length of the magnetic bridge usually need to be kept at a relatively high distance, and there is still the problem of magnetic bridge leakage and reduced motor torque. At the same time, if the weak part of the magnetic bridge breaks, there may be a risk of the permanent magnet 16 slipping out. Summary of the invention

[0005] The object of the present invention is to provide a high-strength magnetic concentrating tangential rotor structure, which can solve the above-mentioned problems and ensure that the motor can still operate safely after a single positioning failure.

[0006] According to the technical solution provided by the present invention: a high-strength magnetic concentrating tangential rotor structure includes a rotor core, a rotor shaft is installed in the middle of the rotor core, a permanent magnet is arranged on the outer periphery of the rotor shaft, and the rotor core is composed of several core corners and an inner ring of the core; the inner ring of the core is located in the middle of the rotor core, and several core corners are evenly distributed on the outer periphery of the inner ring of the core; the core corner is fan-shaped, the top of the core corner is an external magnetic bridge, and the bottom is a connecting rib, and the connecting rib is connected to the outer circumferential surface of the inner ring of the core; the first positioning protection groove and the second positioning protection groove are symmetrically opened on both sides of the core corner, and the extension section in the middle of the first positioning protection groove and the second positioning protection groove forms a permanent magnet positioning protrusion; the inner magnetic bridge is between the first positioning protection groove and the connecting rib; a circular rivet hole is arranged in the middle of the core corner; the middle of the permanent magnet is a concave part, and the two sides are a first protruding end and a second protruding end.

[0007] As a further improvement of the present invention, a plurality of core corners are evenly distributed radially on the outer circumferential surface of the core inner ring.

[0008] As a further improvement of the present invention, the number of core angles is equal to the number of poles of the motor rotor.

[0009] As a further improvement of the present invention, the inner ring of the core is in a ring-shaped structure, and the inside thereof matches the circumferential surface of the rotor shaft.

[0010] As a further improvement of the present invention, the first positioning and protecting grooves and the second positioning and protecting grooves are rectangular.

[0011] As a further improvement of the present invention, the permanent magnet is in an I-shape.

[0012] As a further improvement of the present invention, the length of the concave portion accounts for 1 / 2-2 / 3 of the total length of the permanent magnet.

[0013] As a further improvement of the present invention, two adjacent core corners form a magnet cavity, and a permanent magnet is placed in the magnet cavity.

[0014] As a further improvement of the present invention, the first protruding end of the permanent magnet is located in the first positioning protection groove of two adjacent core corners, and is restricted and clamped from both ends by the internal magnetic bridge and the positioning protrusion respectively; the permanent magnet positioning protrusion on the rotor core penetrates into the concave part of the permanent magnet and cooperates with it, and the second protruding end of the permanent magnet is located in the first positioning protection groove of two adjacent core corners, and is restricted and clamped from both ends by the external magnetic bridge and the positioning protrusion respectively.

[0015] The positive effects of this application are: 1. The present invention can appropriately reduce the thickness and length of the outer magnetic isolation bridge and the inner magnetic isolation bridge, reduce the generation of magnetic leakage, and improve the motor torque and efficiency.

[0016] 2. The present invention enhances the mechanical strength of the rotor structure through the cooperation of the "I-shaped" permanent magnet 16 and the corresponding protection grooves on the rotor core 15, so that the rotor can better withstand large torque.

[0017] 3. The present invention forms multiple positioning protections such as an inner magnetic bridge, an outer magnetic bridge, a first positioning protection groove, and a second positioning protection groove to ensure that the motor can still operate safely after a single positioning fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the rotor core of the present invention.

[0020] Figure 3 It is a schematic structural diagram of the permanent magnet of the present invention. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0025] like Figure 1 As shown, the present invention is a high-strength magnetic concentrating tangential rotor structure, comprising a rotor core 15 , a rotor shaft 17 is installed in the middle of the rotor core 15 , and a permanent magnet 16 is arranged on the periphery of the rotor shaft 17 .

[0026] like Figure 2 As shown, the rotor core 15 is composed of several core corners 18 and a core inner ring 7. The core inner ring 7 is located in the middle of the rotor core 15, and several core corners 18 are evenly distributed on the outer circumference of the core inner ring 7. Specifically, the several core corners 18 are evenly distributed on the outer circumferential surface of the core inner ring 7 in a radial manner.

[0027] Each core angle 18 comprises 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 angles 18 is equal to the number of poles of the motor rotor.

[0028] The core inner ring 7 is in a ring-shaped structure, the interior of which matches the circumferential surface of the rotor shaft 17 and can transmit torque through the rotor shaft.

[0029] The core angle 18 is fan-shaped, with an outer magnetic bridge 1 at the top and a connecting rib 6 at the bottom. The connecting rib 6 is connected to the outer circumferential surface of the core inner ring 7. The first positioning protection groove 2 and the second positioning protection groove 3 are symmetrically opened on both sides of the core angle 18. The positioning protection grooves are rectangular, and the extension section between the first positioning protection groove 2 and the second positioning protection groove 3 forms a permanent magnet positioning protrusion 8. The inner magnetic bridge 4 is 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 angle 18. The rivet hole 5 is as close to the connecting rib 6 as possible while ensuring the strength of the rotor structure, which can reduce the eddy current loss on the rivet to a certain extent. At the same time, in order to reduce the rotor leakage, the width 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 permanent magnet 16 is in an I-shape, with a middle concave portion 13 in the middle of the permanent magnet 16 and a first protruding end 11 and a second protruding end 14 on both sides. The length of the middle concave portion 13 should account for 1 / 2-2 / 3 of the total length of the permanent magnet 16.

[0031] Two adjacent core corners 18 form a magnet cavity, in which a permanent magnet 16 is placed. The magnet cavity is used to reduce the passage of magnetic lines of force and reduce magnetic leakage. The first protruding end 11 of the permanent magnet 16 is located in the first positioning protection groove 2 of the two adjacent core corners 18, and is restricted and clamped from both ends by the inner magnetic bridge 4 and the positioning protrusion 8. The permanent magnet positioning protrusion 8 on the rotor core 15 penetrates into the concave portion 13 of the permanent magnet 16 and cooperates with it. The second protruding end 14 of the permanent magnet 16 is located in the first positioning protection groove 3 of the two adjacent core corners 18, and is restricted and clamped from both ends by the outer magnetic bridge 1 and the positioning protrusion 8.

[0032] By adopting the I-shaped permanent magnet 16 structure and setting the corresponding first positioning protection groove 2 and second positioning protection groove 3 on the rotor core 15, multiple positioning protection can be formed for the permanent magnet 16. If the inner magnetic bridge 4 or the outer magnetic bridge 1 fails, it can still be protected by the first positioning protection groove 2 and the second positioning protection groove 3 to prevent the permanent magnet 16 from flying out and failing due to the electromagnetic force, thereby enhancing the mechanical strength of the rotor structure and making it better able to withstand large torque. At the same time, due to the multiple positioning protection effects, the thickness and height of the outer magnetic bridge 1 and the inner magnetic bridge 4 can be appropriately reduced to reduce the generation of magnetic leakage, thereby improving the motor torque and efficiency.

[0033] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-strength magnetic concentrating tangential rotor structure, comprising a rotor core (15), a rotor shaft (17) installed in the middle of the rotor core (15), and a permanent magnet (16) arranged on the outer periphery of the rotor shaft (17), characterized in that: The rotor core (15) is composed of a plurality of core corners (18) and a core inner ring (7); the core inner ring (7) is located in the middle of the rotor core (15), and a plurality of core corners (18) are evenly distributed around the outer periphery of the core inner ring (7); The core angle (18) is fan-shaped, the top of the core angle (18) is an external magnetic bridge (1), the bottom is a connecting rib (6), and the connecting rib (6) is connected to the outer circumferential surface of the core inner ring (7); the two sides of the core angle (18) are symmetrically provided with a first positioning protection groove (2) and a second positioning protection groove (3), and the extension section between the first positioning protection groove (2) and the second positioning protection groove (3) forms a permanent magnet positioning protrusion (8); the inner magnetic bridge (4) is 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 angle (18); the middle of the permanent magnet (16) is a middle concave portion (13), and the two sides are a first protruding end (11) and a second protruding end (14).

2. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: A plurality of core corners (18) are evenly distributed in a radial pattern on the outer circumferential surface of the core inner ring (7).

3. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: The number of core angles (18) is equal to the number of poles of the motor rotor.

4. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: The core inner ring (7) is in a ring-shaped structure, and its interior is matched with the circumferential surface of the rotor shaft (17).

5. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: The first positioning protection groove (2) and the second positioning protection groove (3) are rectangular.

6. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: The permanent magnet (16) is in an I-shape.

7. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: The length of the concave portion (13) accounts for 1 / 2 to 2 / 3 of the total length of the permanent magnet (16).

8. The high-strength magnetic concentrating tangential rotor structure according to claim 1 is characterized in that: Two adjacent core corners (18) form a magnet cavity, in which a permanent magnet (16) is placed.

9. The high-strength magnetic concentrating tangential rotor structure according to claim 8, characterized in that: The first protruding end (11) of the permanent magnet (16) is located in the first positioning protection groove (2) of two adjacent core corners (18), and is restricted and clamped from both ends by the inner magnetic bridge (4) and the positioning protrusion (8); the permanent magnet positioning protrusion (8) on the rotor core (15) penetrates into the middle recess (13) of the permanent magnet (16) and cooperates therewith; the second protruding end (14) of the permanent magnet (16) is located in the first positioning protection groove (3) of two adjacent core corners (18), and is restricted and clamped from both ends by the outer magnetic bridge (1) and the positioning protrusion (8).

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