TW202224315A - Permanent magnet rotor, related permanent magnet electric motor, and related permanent magnet electric generator - Google Patents

Abstract

A permanent magnet rotor includes a plurality of permanent magnets and a main body. A plurality of embedding slots are formed on the main body. Each embedding slot includes a first slot wall, a second slot wall, a third slot wall and a fourth slot wall. A recess is formed on the fourth slot wall. A third abutting portion and a fourth abutting portion are formed on the fourth slot wall and located at two opposite sides of the recess. When each permanent magnet is embedded into the corresponding embedding slot, a distal end of each permanent magnet abuts against the third abutting portion and the fourth abutting portion but not contact with the recess, and two lateral surfaces of each permanent magnet adjacent to the proximal end and opposite to each other abut against the first slot wall and the second slot wall respectively.

Description

Permanent magnet rotors, associated permanent magnet motors, and associated permanent magnet generators

The present invention relates to a permanent magnet rotor, a related permanent magnet motor and a related permanent magnet generator, especially a permanent magnet rotor, a related permanent magnet motor and a related permanent magnet generator that can avoid magnet demagnetization.

Permanent magnet motors and permanent magnet generators are widely used in different fields due to their advantages of small size, low loss and high efficiency. The performance will be reduced, and the demagnetization of the magnet is irreversible, so how to avoid the demagnetization of the magnet has become an important issue that the industry pays attention to.

The purpose of the present invention is to provide a permanent magnet rotor, a related permanent magnet motor and a related permanent magnet generator that can avoid magnet demagnetization, so as to solve the above problems.

In order to achieve the above object, the present invention discloses a permanent magnet rotor, which includes a plurality of permanent magnets and a main body, the main body is a cylindrical structure and can rotate around a rotation axis extending along an axial direction of the main body, the main body is a cylindrical structure The main body is arranged in the stator, an air gap is formed between the main body and the stator, and a plurality of insertion grooves for accommodating the plurality of permanent magnets are formed on the main body, and the plurality of insertion grooves are along a circumferential direction of the main body The directions are spaced apart, each inserting groove includes a first groove wall, a second groove wall, a third groove wall and a fourth groove wall, the first groove wall and the second groove wall are along one of the main body. The radial direction extends and is opposite to each other, the third groove wall connects the first groove wall and the second groove wall, the fourth groove wall connects the first groove wall and the second groove wall and is opposite to the third groove The third groove wall is close to the rotating shaft, the fourth groove wall is far away from the rotating shaft, the fourth groove wall is formed with a concave part, and a third abutting part and a fourth abutting part are respectively formed in the first The four groove walls are located on opposite sides of the recessed portion. When the permanent magnets are embedded in the corresponding embedded grooves, the permanent magnets are far away from the rotating shaft and are adjacent to one of the first side surface and the second side surface. The end faces are in contact with the third abutting portion and the fourth abutting portion and are not in contact with the concave portion, and each permanent magnet is adjacent to the distal end face and is opposite to each other with a first side surface and a second side surface respectively abutting against the first groove wall and the second groove wall.

According to one embodiment of the present invention, a width of the recessed portion along the circumferential direction is greater than or equal to four times a width of the air gap along the radial direction.

According to one embodiment of the present invention, a distance between a bottom of the recessed portion and a peripheral edge of the main body along the radial direction is less than three times the width of the air gap along the radial direction.

According to one embodiment of the present invention, a notch is formed on the third groove wall, and a first abutting portion and a second abutting portion are respectively formed on opposite sides of the third groove wall located on the notch. When the permanent magnets are embedded in the corresponding insertion grooves, a proximal end surface of each permanent magnet close to the rotating shaft abuts against the first abutting portion and the second abutting portion.

According to one embodiment of the present invention, a width of the gap along the circumferential direction is greater than or equal to four times a width of the air gap along the radial direction.

According to one embodiment of the present invention, a plurality of hollow grooves are further formed on the main body, each hollow groove is located on the side of the corresponding insert groove close to the rotating shaft, and each hollow groove is connected to the corresponding one by the gap. The sockets communicate.

According to one embodiment of the present invention, a major axis direction of each hollow groove extends along the circumferential direction of the main body.

According to one embodiment of the present invention, a width of each hollow groove along the radial direction is greater than or equal to four times a width of the air gap along the radial direction.

According to an embodiment of the present invention, a width of the first abutting portion along the radial direction and a width of the second abutting portion along the radial direction are greater than or equal to twice the air gap along the radial direction The width of one of the directions.

According to one embodiment of the present invention, the main body is formed with a plurality of spacing grooves, and each spacing groove is located between the corresponding two adjacent embedding grooves.

According to one embodiment of the present invention, a major axis direction of each spacing groove extends along the radial direction of the main body.

According to one embodiment of the present invention, a width of each spacing groove along the circumferential direction is greater than or equal to twice a width of the air gap along the radial direction.

According to one embodiment of the present invention, a distance between a peripheral edge of a distal end portion of each spacing groove and a peripheral edge of the main body along the radial direction is greater than twice a width of the air gap along the radial direction.

According to one embodiment of the present invention, the main system is composed of a plurality of silicon steel sheets.

In order to achieve the above object, the present invention further discloses a permanent magnet motor, which includes a stator and the permanent magnet rotor of any of the above embodiments.

In order to achieve the above object, the present invention further discloses a permanent magnet generator, which includes a stator and a permanent magnet rotor according to any of the above embodiments.

To sum up, the present invention mainly uses the first abutting part and the second abutting part to abut the proximal end surface of the permanent magnet when the permanent magnet is embedded in the corresponding inserting groove, and also uses the third abutting part to abut the proximal end surface of the permanent magnet. The contact part and the fourth contact part are in contact with the distal end surface of the permanent magnet, so that the main body forms a strong magnetic permeability region with better magnetic permeability at the corresponding corners of the proximal end surface and the distal end surface of each permanent magnet, Thus, demagnetization of each permanent magnet is avoided.

The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present invention. In addition, the term "connection" herein includes any direct and indirect means of electrical or structural connection. Therefore, if a first device is described as being connected to a second device, it means that the first device can be directly electrically/structurally connected to the second device, or indirectly electrically/structurally connected to the second device through other devices or connecting means. Second device.

Please refer to FIGS. 1 to 5. FIG. 1 is a schematic diagram of a partial structure of a permanent magnet device 1 according to an embodiment of the present invention, and FIG. 2 is an exploded view of components of a partial structure of the permanent magnet device 1 according to an embodiment of the present invention. , Fig. 3 is a schematic diagram of a partial structure of a permanent magnet device 1 according to an embodiment of the present invention, Fig. 4 is an enlarged schematic view of a partial structure of a permanent magnet rotor 11 of a permanent magnet device 1 according to an embodiment of the present invention, and Fig. 5 is a schematic diagram of the present invention An enlarged schematic diagram of a part of the structure of the permanent magnet device 1 of the embodiment. As shown in FIGS. 1 to 5 , the permanent magnet device 1 can be a permanent magnet generator or a permanent magnet motor. The permanent magnet device 1 includes a permanent magnet rotor 11 , a stator 12 and a housing 13 , and the stator 12 is fixedly arranged. Inside the casing 13 , the permanent magnet rotor 11 is rotatably arranged inside the stator 12 . The permanent magnet generator uses the magnetic field change of the permanent magnet rotor 11 relative to the stator 12 to generate current in the stator 12 , and the permanent magnet motor inputs the current into the stator 12 to generate a magnetic field to drive the permanent magnet rotor 11 to rotate.

The stator 12 may include a stator body 121 and a plurality of stator coils 122. A plurality of stator slots 1211 are formed on the stator body 121. The stator body 121 may be a cylindrical structure and is made of a magnetically conductive material (such as silicon steel). Preferably, the stator body 121 is formed by stacking a plurality of silicon steel sheets, and a plurality of stator coils 122 are wound around a plurality of stator slots 1211 , however, the present invention is not limited to this, and depends on actual needs.

As shown in FIGS. 2 to 5 , the permanent magnet rotor 11 includes a plurality of permanent magnets 111 and a main body 112 . The main body 112 is a cylindrical structure disposed in the stator 12 and is made of magnetically conductive material (eg, silicon steel). An air gap G is formed between the main body 112 and the stator body 121 of the stator 12. Preferably, the main body 112 can be formed by stacking a plurality of silicon steel sheets, and the main body 112 can be wound along an axial direction D1 of the main body 112. A rotating shaft R of the extension rotates. The main body 112 is formed with a plurality of inserting grooves 1121 for accommodating a plurality of permanent magnets 111 .

Each inserting groove 1121 includes a first groove wall W1, a second groove wall W2, a third groove wall W3 and a fourth groove wall W4. The first groove wall W1 and the second groove wall W2 are along one of the main body 112. The radial direction D3 extends and faces each other, the third groove wall W3 connects the first groove wall W1 and the second groove wall W2, and the fourth groove wall W4 connects the first groove wall W1 and the second groove wall W2 and is opposite to the third groove wall The wall W3, the third groove wall W3 are close to the rotating shaft R, the fourth groove wall W4 is far away from the rotating shaft R, a gap N1 is formed on the third groove wall W3, a first abutting part P1 and a second abutting part P2 are respectively The third groove wall W3 is formed on opposite sides of the notch N1. When each permanent magnet 111 is embedded in the corresponding embedding groove 1121, a proximal end surface S1 of each permanent magnet 111 close to the rotation axis R abuts against the first abutting portion P1 and the second abutting portion P2, and each A first side surface S2 and a second side surface S3 of the permanent magnet 111 adjacent to the end surface S1 and opposite to each other abut against the first groove wall W1 and the second groove wall W2, respectively. The above structure enables the main body 112 to form a strong magnetic permeability region with better magnetic permeability at the corresponding corners of the permanent magnets 111 and close to the rotation axis R, so as to avoid the demagnetization of the permanent magnets 111 .

In addition, a recessed portion N2 is formed on the fourth groove wall W4, and a third abutting portion P3 and a fourth abutting portion P4 are respectively formed on opposite sides of the fourth groove wall W4 on the opposite sides of the recessed portion N2. When the 111 is embedded in the corresponding inserting groove 1121, a distal surface S4 of each permanent magnet 111 away from the rotation axis R and adjacent to the first side surface S2 and the second side surface S3 abuts against the third contact portion P3 and the fourth side surface S4. The contact portion P4 is not in contact with the recessed portion N2. The above structure enables the main body to form a strong magnetically permeable region with better magnetic permeability near the corresponding corners of the permanent magnets 111 and away from the rotation axis R, thereby preventing the demagnetization of the permanent magnets 111 .

However, the structure of the insert groove of the present invention is not limited to this embodiment. For example, in another embodiment, the distal end surface of the permanent magnet away from the rotating shaft can be exposed to the main body. The insert groove only uses the first abutting portion and the second abutting portion to abut the proximal end surface of the permanent magnet, and also uses the first groove wall and the second groove wall to abut the first side wall and the second side wall of the permanent magnet respectively, In order to form a strong magnetic permeability region with better magnetic permeability near the corresponding corner of the permanent magnet and close to the rotating shaft, this arrangement also has the effect of avoiding the demagnetization of the permanent magnet to a certain extent. Or, in another embodiment, the insert groove can only use the third abutting part and the fourth abutting part to abut the distal end surface of the permanent magnet, and use the first groove wall and the second groove wall to respectively abut The first side wall and the second side wall of the permanent magnet are adjacent to the corresponding corner of the permanent magnet and away from the rotation axis to form a strong magnetic permeability region with better magnetic permeability. This arrangement also has a certain degree of avoiding the demagnetization of the permanent magnet. Effect.

In addition, as described above, since the distal end surface S4 of the permanent magnet 11 which is far from the rotation axis R and is adjacent to the first side surface S2 and the second side surface S3 does not contact the recessed portion N2, there is no contact between the recessed portion N2 and the permanent magnet 11. The space can form a weak magnetic permeability region with poor magnetic permeability, so that the magnetic field lines of the permanent magnets 11 can be guided away from the recess N2 and concentratedly extending toward the stator 12 along the radial direction D3 of the main body 112 to elevate the permanent magnets the performance of the generator or the permanent magnet motor.

Furthermore, a plurality of hollow grooves 1122 are formed on the main body 112, and each hollow groove 1122 is located on the side of the corresponding inserting groove 1121 close to the rotation axis R, and each hollow groove 1122 is connected to the corresponding inserting groove by the gap N1. 1121 communicates with each other. Preferably, the long axis direction of each hollow groove 1122 extends along the circumferential direction D2 of the main body 112 . Since the space in each hollow slot 1122 can also form a weak magnetic permeability region with poor magnetic permeability, the magnetic field lines of each permanent magnet 11 can be guided away from the corresponding hollow slot 1122 and concentrated along the radial direction D3 of the main body 112 Extend toward the stator 12 to improve the performance of the permanent magnet generator or the permanent magnet motor.

In addition, the main body 112 is further formed with a plurality of spacing grooves 1123 , and each spacing groove 1123 is located between two corresponding adjacent inserting grooves 1121 . Preferably, the long axis direction of each spacing groove 1123 is along the radial direction of the main body 112 . D3 extension. Since the space in each interval slot 1123 can also form a weak magnetic permeability region with poor magnetic permeability, the magnetic field lines of each permanent magnet 11 can be guided away from the corresponding interval slot 1123 and toward the stator along the radial direction D3 of the main body 112 12 is extended to prevent the magnetic field lines of two adjacent permanent magnets 11 from interacting with each other, and to improve the performance of the permanent magnet generator or the permanent magnet motor.

In addition, since the sizes of the notch N1, the recessed portion N2, the hollow groove 1122, the spaced groove 1123, the first abutting portion P1 and the second abutting portion P2 also affect the distribution of the magnetic field lines, in order to make the magnetic field lines of the permanent magnets 11 concentrated Extending toward the stator 12, preferably, the air gap G has a width H1 along the radial direction D3, and a width H2 of the gap N1 along the circumferential direction D2 is greater than or equal to four times the width H1 of the air gap G along the radial direction D3 , a width H3 of each hollow groove 1122 along the radial direction D3 is greater than or equal to four times the width H1 of the air gap G along the radial direction D3, a width H4 of the first abutting portion P1 along the radial direction D3 and the second width H4 along the radial direction D3 A width H5 of the contact portion P2 along the radial direction D3 is greater than or equal to twice the width H1 of the air gap G along the radial direction D3, and a width H6 of the recessed portion N2 along the circumferential direction D2 is greater than or equal to four times the air gap. The width H1 of the gap G along the radial direction D3, a distance H7 between the bottom of the recess N2 and the periphery of the main body 112 along the radial direction D3 is less than three times the width H1 of the air gap G along the radial direction D3, and each interval groove 1123 is along the radial direction D3. A width H8 in the circumferential direction D2 is greater than or equal to twice the width H1 of the air gap G along the radial direction D3, and a distance H9 between the periphery of the distal end portion of each spacing groove 1123 and the periphery of the main body 112 along the radial direction D3 is greater than Twice the width H1 of the air gap G along the radial direction D3.

To sum up, the present invention mainly uses the first abutting part and the second abutting part to abut the proximal end surface of the permanent magnet when the permanent magnet is embedded in the corresponding inserting groove, and also uses the third abutting part to abut the proximal end surface of the permanent magnet. The contact part and the fourth contact part are in contact with the distal end surface of the permanent magnet, so that the main body forms a strong magnetic permeability region with better magnetic permeability at the corresponding corners of the proximal end surface and the distal end surface of each permanent magnet, Thus, demagnetization of each permanent magnet is avoided. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

1: Permanent magnet equipment 11: Permanent magnet rotor 111: Permanent magnet 112: Subject 1121: Groove 1122: Hollow slot 1123: Spacer slot 12: Stator 121: Stator body 1211: Stator slot 122: stator coil 13: Shell D1: Axial direction D2: Circumferential direction D3: Radial direction G: air gap H1,H2,H3,H4,H5,H6,H8: Width H7,H9: Distance N1: Notch N2: Depressed part P1: The first contact part P2: Second contact part P3: The third contact part P4: Fourth contact part R: Rotary axis S1: proximal face S2: first side S3: Second side S4: Distal face W1: first groove wall W2: Second groove wall W3: The third groove wall W4: Fourth slot wall

FIG. 1 is a schematic diagram of a partial structure of a permanent magnet device according to an embodiment of the present invention. FIG. 2 is an exploded view of the components of the partial structure of the permanent magnet device according to the embodiment of the present invention. FIG. 3 is a partial structural schematic diagram of a permanent magnet device according to an embodiment of the present invention. FIG. 4 is an enlarged schematic diagram of a part of the structure of a permanent magnet rotor of a permanent magnet device according to an embodiment of the present invention. FIG. 5 is an enlarged schematic diagram of a part of the structure of a permanent magnet device according to an embodiment of the present invention.

11: Permanent magnet rotor

111: Permanent magnet

112: Subject

1121: Groove

1122: Hollow slot

1123: Spacer slot

D2: Circumferential direction

D3: Radial direction

N1: Notch

N2: Depressed part

P1: The first contact part

P2: Second contact part

P3: The third contact part

P4: Fourth contact part

S1: proximal face

S2: first side

S3: Second side

S4: Distal face

W1: first groove wall

W2: Second groove wall

W3: The third groove wall

W4: Fourth slot wall

Claims (16)

A permanent magnet rotor comprising: a plurality of permanent magnets; and a main body, which is a cylindrical structure and can rotate around a rotation axis extending along an axial direction of the main body, the main body is arranged in the stator, an air gap is formed between the main body and the stator, and the main body is A plurality of insert grooves are formed for accommodating the plurality of permanent magnets, the plurality of insert grooves are arranged at intervals along a circumferential direction of the main body, and each insert groove includes a first groove wall, a second groove wall, a A third groove wall and a fourth groove wall, the first groove wall and the second groove wall extend along a radial direction of the main body and are opposite to each other, the third groove wall connects the first groove wall and the first groove wall Two groove walls, the fourth groove wall connects the first groove wall and the second groove wall and is opposite to the third groove wall, the third groove wall is close to the rotating shaft, and the fourth groove wall is far away from the rotating shaft, The fourth groove wall is formed with a concave portion, and a third abutting portion and a fourth abutting portion are respectively formed on opposite sides of the fourth groove wall located in the concave portion. When the permanent magnets are embedded in the corresponding When the slot is inserted, a distal end surface of each permanent magnet far from the rotating shaft and adjacent to the first side surface and the second side surface abuts against the third abutting portion and the fourth abutting portion and does not contact the In the recessed portion, a first side surface and a second side surface of each permanent magnet adjacent to the distal end surface and opposite to each other abut against the first groove wall and the second groove wall, respectively. The permanent magnet rotor of claim 1, wherein a width of the recessed portion in the circumferential direction is greater than or equal to four times a width of the air gap in the radial direction. The permanent magnet rotor of claim 1, wherein a distance between a bottom of the recessed portion and a peripheral edge of the main body along the radial direction is less than three times the width of the air gap along the radial direction. The permanent magnet rotor of claim 1, wherein a notch is formed on the third slot wall, and a first abutting portion and a second abutting portion are respectively formed on two opposite sides of the third slot wall located in the notch. On the other hand, when each permanent magnet is embedded in the corresponding insertion groove, a proximal end surface of each permanent magnet close to the rotating shaft abuts against the first abutting portion and the second abutting portion. The permanent magnet rotor of claim 4, wherein a width of the gap along the circumferential direction is greater than or equal to four times a width of the air gap along the radial direction. The permanent magnet rotor according to claim 4, wherein a plurality of hollow slots are further formed on the main body, each hollow slot is located on a side of the corresponding insert slot close to the rotating shaft, and each hollow slot is formed by the gap. communicate with the corresponding insert groove. The permanent magnet rotor of claim 6, wherein a major axis direction of each hollow slot extends along the circumferential direction of the main body. The permanent magnet rotor of claim 6, wherein a width of each hollow slot along the radial direction is greater than or equal to four times a width of the air gap along the radial direction. The permanent magnet rotor of claim 4, wherein a width of the first abutting portion along the radial direction and a width of the second abutting portion along the radial direction are greater than or equal to twice the air gap Width in one of the radial directions. The permanent magnet rotor according to claim 1, wherein the main body is formed with a plurality of spaced grooves, and each spaced groove is located between the corresponding two adjacent insertion grooves. The permanent magnet rotor of claim 10, wherein a major axis direction of each spacing slot extends along the radial direction of the main body. The permanent magnet rotor of claim 10, wherein a width of each spacing slot along the circumferential direction is greater than or equal to twice a width of the air gap along the radial direction. The permanent magnet rotor of claim 10, wherein a distance between a periphery of a distal end portion of each spacer slot and a periphery of the main body in the radial direction is greater than twice one of the air gaps in the radial direction width. The permanent magnet rotor according to claim 1, wherein the main body is composed of a plurality of silicon steel sheets. A permanent magnet motor comprising a stator and a permanent magnet rotor according to any one of claims 1 to 14. A permanent magnet generator comprising a stator and a permanent magnet rotor according to any one of claims 1 to 14.

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