CN212435459U - External rotor for low-speed large-torque external rotor motor - Google Patents
External rotor for low-speed large-torque external rotor motor Download PDFInfo
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- CN212435459U CN212435459U CN202022064601.2U CN202022064601U CN212435459U CN 212435459 U CN212435459 U CN 212435459U CN 202022064601 U CN202022064601 U CN 202022064601U CN 212435459 U CN212435459 U CN 212435459U
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Abstract
The utility model discloses an external rotor for low-speed large-torque external rotor motor, which comprises a shell, a magnetic conduction frame and magnetic steel, and is characterized in that the shell comprises an end cover and a positioning ring formed on one surface of the end cover, the magnetic conduction frame is positioned on the inner periphery of the positioning ring, the magnetic conduction frame is formed by arranging a plurality of independent magnetic conduction blocks along the circumference, the external rotor also comprises a pressing plate for pressing the magnetic conduction frame on the end cover, and the pressing plate is fixed on the end cover by adopting a plurality of axial fasteners; the left side and the right side of each magnetic conduction block are respectively provided with a magnetic steel half clamping groove, and two opposite magnetic steel half clamping grooves on two adjacent magnetic conduction blocks on the circumference are jointly spliced into a magnetic steel clamping groove so as to be radially embedded with magnetic steel; and key groove matching structures are arranged between the front end of the magnetic conduction block and the pressure plate as well as between the rear end of the magnetic conduction block and the end cover to support and position the magnetic conduction block. The outer rotor has higher salient pole rate, is more convenient to produce and manufacture, can reduce cost, and has better positioning stability to the magnetic steel.
Description
Technical Field
The utility model belongs to the technical field of permanent magnetism external rotor electric machine's structure, concretely relates to an external rotor for low-speed big torsion external rotor electric machine.
Background
The known external rotor motor is widely applied to the field of manufacturing and manufacturing hub motors of electric bicycles, scooters, flatbeds and driving motors of electric automobiles, and is developing towards the technical improvement of low speed and large torque force. The key of the external rotor motor for realizing low speed and large torque force is to improve the salient pole rate of the rotor so as to enable the motor to apply weak magnetic speed regulation and driving technology.
As is known, in the manufacturing of the conventional rotor, the rotor magnetic steel is usually attached to the inner periphery of the annular iron core, which has the disadvantage of low salient pole ratio, and is not beneficial to applying technologies such as field weakening speed regulation driving and the like on the outer rotor motor, so that the performance of the low-speed high-torque motor cannot be better improved. As an improvement, the existing rotors, particularly the inner rotor of an inner rotor motor, are provided with magnetic conductive supports which are formed by laminating punching sheets and are sleeved on the periphery of a rotor core, and magnetic steel grooves which are radially extended and used for embedding magnetic steel are arranged on the magnetic conductive supports at intervals along the circumference, so that each magnetic steel is installed along the radial direction of the rotor core, the magnetic steel arrangement on the circumference is more, the salient pole rate is effectively improved, the application of the technologies of weak magnetic speed regulation driving and the like on the motors is facilitated, and the low-speed large torque is better realized.
However, the outer rotor is different from the inner rotor, the specification of the outer rotor is larger, if the punching sheet magnetic conduction frame is adopted, the processing difficulty is very high, and the production cost is greatly increased. Meanwhile, the outer rotor adopts the shell to replace a middle rotor iron core as a supporting structure, so that the supporting stability of the magnetic conduction frame is weak. If the diameter of the punching type magnetic conduction frame is designed to be larger, the stability can be further reduced, and the positioning stability of the magnetic steel fixed on the punching type magnetic conduction frame is further influenced.
Therefore, a better outer rotor is urgently needed in the industry at present, the production and the manufacture are more convenient while the salient pole rate is higher, the production cost is lower, and the positioning stability of the magnetic steel is better.
Disclosure of Invention
The utility model discloses the purpose is: the outer rotor for the low-speed large-torque outer rotor motor is higher in salient pole rate, more convenient to produce and manufacture, capable of reducing production cost and better in positioning stability of magnetic steel.
The technical scheme of the utility model is that: the outer rotor for the low-speed large-torque outer rotor motor comprises a shell, a magnetic conduction frame and magnetic steel, and is characterized in that the shell comprises an end cover and a positioning ring formed on one surface of the end cover, the magnetic conduction frame is positioned on the inner periphery of the positioning ring, the magnetic conduction frame is formed by arranging a plurality of independent magnetic conduction blocks along the circumference, the outer rotor further comprises a pressing plate used for pressing the magnetic conduction frame on the end cover, and the pressing plate is fixed to the end cover by a plurality of axial fasteners; the left side and the right side of each magnetic conduction block are respectively provided with a magnetic steel half clamping groove, and two opposite magnetic steel half clamping grooves on two adjacent magnetic conduction blocks on the circumference are jointly spliced into a magnetic steel clamping groove so as to be radially embedded with magnetic steel; and key groove matching structures are arranged between the front end of the magnetic conduction block and the pressure plate as well as between the rear end of the magnetic conduction block and the end cover to support and position the magnetic conduction block.
Further, in the present invention, the magnetic conductive block is a powder metallurgy magnetic conductive block.
Furthermore, in the present invention, the top surface of the magnetic conductive block is a cambered surface that is attached to the inner peripheral wall surface of the positioning ring.
Further, in the utility model discloses in half draw-in groove of magnet steel is L shape draw-in groove, pieces together the radial width of magnet steel draw-in groove all is greater than its circumference width, just the top of magnet steel offsets with the interior week wall of position circle.
The utility model discloses well magnetic conduction piece front end and clamp plate to and the keyway cooperation structural design form between magnetic conduction piece rear end and the end cover is various, can establish the convex key for example by the magnetic conduction piece front end, establishes the recess on the clamp plate, and the convex key is established on also can the clamp plate in reverse, and the recess is established to the magnetic conduction piece front end. Similarly, the rear end of the magnetic conduction block is provided with a convex key, and the end cover is provided with a groove, and vice versa. The convex key can be a conventional square key or a conventional round key, and the groove is designed to be matched with the convex key in shape. As in the prior art, a square key is a key having a square or rectangular cross section, and a round key is a key having a circular cross section.
Of course the utility model discloses provide a preferred scheme to keyway cooperation structure: in the utility model, the front end of each magnetic conduction block is formed with a front convex key, the pressing plate is provided with a pressing plate groove matched with the front convex key, meanwhile, the rear end of each magnetic conduction block is formed with a rear convex key, and the end cover is formed with an end cover groove matched with the rear convex key; and lifting inclined planes tending to extrude the magnetic conduction block towards the direction of the positioning ring are arranged in the pressing plate groove and the end cover groove.
More preferably, the front convex key and the rear convex key are provided with guide inclined planes matched with the corresponding lifting inclined planes.
In addition to the above-mentioned key groove fitting structure, the key groove fitting structure of the present invention may be designed in the following form: in the utility model, the front end of each magnetic conduction block is provided with a front groove, the pressing plate is provided with a pressing plate groove opposite to the front groove, and the magnetic conduction block fixing device also comprises an independent front positioning key, one side of the front positioning key is clamped into the pressing plate groove, and the other side of the front positioning key is clamped into the front groove to position the magnetic conduction block; and the rear end of each magnetic conduction block is provided with a rear groove, the end cover is provided with an end cover groove opposite to the rear groove, the magnetic conduction block positioning device further comprises an independent rear positioning key, one side of the rear positioning key is clamped into the end cover groove, and the other side of the rear positioning key is clamped into the rear groove to position the magnetic conduction block. And in practical implementation, the front positioning key can be a square key or a round key, and the rear positioning key can also be a square key or a round key.
The utility model discloses when implementing, in order to strengthen every magnetic conduction piece's location steadiness for cross-under stationary platen's axial fastener also can cross-under stationary magnetic conduction piece simultaneously. For example, each magnetic conductive block is fastened to the end cover by the axial fasteners in a penetrating manner, that is, the axial fasteners and the magnetic conductive blocks are arranged in a one-to-one corresponding relationship. Or one part of the magnetic conduction block is fastened to the end cover by the axial fastener in a penetrating way.
It is generally preferred that the number of some of the magnetic blocks is 1/3-1/2 of the total number of the magnetic blocks.
Further, in the present invention, the axial fastening member is a screw, a bolt or a rivet.
The utility model has the advantages that:
1. the utility model discloses an outer rotor, it adopts the magnetic conduction frame to come radially to inlay the dress magnet steel in order improving the salient pole rate, ensures that the outer rotor electric machine who adopts this outer rotor can use weak magnetic speed governing and drive technique, and the big torsion of better realization low-speed can improve more than 50% under same input power motor torsion to ensure that the quilt that this type of motor can be better is used on electric bicycle, scooter, flatbed and electric automobile.
2. The utility model discloses when guaranteeing that motor salient pole rate improves, it lies in that magnetic conduction frame arranges by a plurality of solitary powder metallurgy magnetic conduction pieces along the circumference with prior art difference and constitutes, and not fold by the punching, just so makes the simple that the production and processing of magnetic conduction frame becomes, and the cost also reduces, really makes this kind of external rotor can be produced and implemented and be used for on the big torsion external rotor electric machine of low-speed, and then improves the motor performance.
3. The utility model discloses in adopt clamp plate, axial fastener to come the magnet steel to compress tightly fixedly to the shell to at the front end and the clamp plate of magnetic conduction piece, and all be equipped with keyway cooperation structure between the rear end of magnetic conduction piece and the end cover in order to support location magnetic conduction piece, very big improvement to the positioning stability of magnetic conduction piece, prevent that the magnetic conduction piece radially inwards sinks in long-term the use. And in preferred keyway cooperation structural scheme, all be equipped with the lifting inclined plane that tends to extrude the magnetic conduction piece toward the position circle direction in clamp plate recess and the end cover recess, when clamp plate and end cover front and back clamp tightly the magnetic conduction piece, rely on the lifting inclined plane just to make the magnetic conduction piece keep the top tightly to the position circle internal perisporium all the time, and then guarantee to the location steadiness of magnet steel, strengthen rotor operational reliability.
Drawings
The invention will be further described with reference to the following drawings and examples:
fig. 1 is a front sectional view of an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of the embodiment of FIG. 1 (showing the key slot engaging structure of the magnetic block between the front and rear ends thereof and the pressure plate and the end cap, and the axial fixing structure of the magnetic block);
FIG. 3 is a cross-sectional view taken along line A-A of a second embodiment of the present invention;
FIG. 4 is a sectional view taken along line A-A of a third embodiment of the present invention;
FIG. 5 is a sectional view taken along line A-A of a fourth embodiment of the present invention;
fig. 6 is a sectional view taken along line a-a of a fifth embodiment of the present invention;
fig. 7 is a sectional view taken along line a-a of a sixth embodiment of the present invention.
Wherein: 1. a housing; 101. an end cap; 101a, an end cover groove; 101b, end cover convex keys; 102. positioning rings; 2. magnetic steel; 3. a magnetic conduction block; 301. a magnetic steel half clamping groove; 3a, a front convex key; 3b, a rear convex key; 3c, a front groove; 3d, a rear groove; 4. pressing a plate; 4a, pressing plate grooves; 4b, pressing plate convex keys; b1, lifting the inclined plane; b2, guide ramp; 5. a front positioning key; 6. a rear positioning key; 7. an axial fastener.
Detailed Description
Example 1: with reference to fig. 1-2, for the utility model discloses a concrete implementation of an external rotor for big torsion external rotor electric machine of low-speed, it comprises shell 1, magnetic conduction frame, a plurality of magnet steel 2 and clamp plate 4 jointly, the utility model discloses well shell 1 comprises end cover 101 and the position circle 102 of shaping in end cover 101 one side jointly. The magnetic conduction frame is located on the inner periphery of the positioning ring 102, and in this embodiment, the magnetic conduction frame is formed by arranging 30 individual magnetic conduction blocks 3 along the circumference, each magnetic conduction block 3 is fixed to the end cover 101 by using an axial fastening piece 7, and the axial fastening pieces 7 are screws, as shown in fig. 2. The magnetic conduction blocks 3 are all powder metallurgy magnetic conduction blocks. The center of the end cover 101 is provided with a shaft hole, which is used for being sleeved on a motor shaft of the outer rotor motor as in the conventional technology.
The utility model discloses the left and right sides of every magnetic conduction piece 3 in all is equipped with magnet steel half draw-in groove 301, and two magnet steel half draw-in grooves 301 relative on two adjacent magnetic conduction pieces 3 on the circumference are pieced together the magnet steel draw-in groove and are radially inlayed and adorned magnet steel 2, combine that fig. 1 shows. In addition, in this embodiment, the magnetic steel half slot 301 is an L-shaped slot, the radial width of the magnetic steel slot is greater than the circumferential width of the magnetic steel slot, and the top of the magnetic steel 2 abuts against the inner peripheral wall surface of the positioning ring 102.
The pressing plate 4 is used for pressing the magnetic conduction frame on the end cover 101, and the pressing plate 4 is jointly fastened to the end cover 101 in a penetrating manner by the screws for fastening the magnetic conduction blocks 3 in a penetrating manner, as shown in fig. 2; and key slot matching structures are arranged between the front end of the magnetic conduction block 3 and the pressure plate 4 and between the rear end of the magnetic conduction block 3 and the end cover 101 to support and position the magnetic conduction block 3. In this embodiment, the top surface of the magnetic conductive block 3 is an arc surface attached to the inner peripheral wall surface of the positioning ring 102.
Referring to fig. 2, in this embodiment, a front convex key 3a is formed at the front end of each magnetic conductive block 3, a pressing plate groove 4a matched with the front convex key 3a is formed on the pressing plate 4, a rear convex key 3b is formed at the rear end of each magnetic conductive block 3, and an end cover groove 101a matched with the rear convex key 3b is formed on the end cover 101; and the pressure plate groove 4a and the end cover groove 101a are both provided with a lifting inclined plane B1 tending to press the magnetic conduction block 3 towards the positioning ring 102, and similarly, the front convex key 3a and the rear convex key 3B are both provided with a guide inclined plane B2 matched with the corresponding lifting inclined plane B1. When the pressing plate 4 and the end cover 101 clamp the magnetic conduction block 3 front and back, the magnetic conduction block 3 can be always kept tightly pressed on the inner peripheral wall of the positioning ring 102 by depending on the lifting inclined plane A, so that the positioning stability of the magnetic steel 2 is ensured, and the working reliability of the rotor is enhanced.
Example 2: the overall structure of this embodiment is substantially the same as that of embodiment 1, and can be seen from fig. 1, except for the axial fixing manner of each magnetic conduction block 3, so the sectional view a-a is different from that of embodiment 1, and specifically, as shown in fig. 3, each magnetic conduction block 3 in this embodiment is fixed to the end cover 101 by using a rivet as the axial fastener 7, and the same pressing plate 4 is also fastened by using the rivet.
Example 3: the overall structure of this embodiment is substantially the same as that of embodiment 1, and can be seen from fig. 1, except for the key-slot matching structure between the front end of the magnetic block 3 and the pressure plate 4, and between the rear end of the magnetic block 3 and the end cover 101. Therefore, the sectional view a-a is different from that of embodiment 1, and specifically, as shown in fig. 4, in this embodiment, a front protruding key 3a is formed at the front end of each magnetic conduction block 3, such front protruding key 3a is a square key, and there is no lifting inclined plane like that in embodiment 1, a pressing plate groove 4a which is matched with the front protruding key 3a is provided on the corresponding pressing plate 4, and the pressing plate groove 4a is a square groove. Similarly, a rear convex key 3b is formed at the rear end of each magnetic conduction block 3, the rear convex key 3b is a square key without a lifting inclined plane, an end cover groove 101a matched with the rear convex key 3b is formed in the end cover 101, and the end cover groove 101a is a square groove.
Example 4: compared with the embodiment 3, the overall structure of this embodiment is different in that the front convex key 3a at the front end of the magnetic conductive block 3 and the pressing plate groove 4a on the pressing plate 4 are exchanged, that is, the pressing plate convex key 4b is formed on the pressing plate 4 and is a square key, and the groove (whose mark is omitted) matched with the pressing plate convex key 4b is formed at the front end of the magnetic conductive block 3, as shown in fig. 5. Similarly, the rear convex key 3b at the rear end of the magnetic conduction block 3 is exchanged with the end cover groove 101a on the end cover 101, that is, the end cover convex key 101b is formed on the end cover 101 and is also a square key, and a groove (the mark is omitted) matched with the end cover convex key is formed at the rear end of the magnetic conduction block 3. The rest of the structure of this embodiment is the same as embodiment 3.
Example 5: the overall structure of this embodiment is substantially the same as that of embodiment 1, and can be seen from fig. 1, except for the key-slot matching structure between the front end of the magnetic block 3 and the pressure plate 4, and between the rear end of the magnetic block 3 and the end cover 101. Therefore, the sectional view a-a is different from that of embodiment 1, and specifically, as shown in fig. 6, in this embodiment, a front groove 3c is provided at the front end of each magnetic conductive block 3, and a pressing plate groove 4a opposite to the front groove 3c is provided on the pressing plate 4, and the magnetic conductive block further includes an independent front positioning key 5, one side of the front positioning key 5 is clamped into the pressing plate groove 4a, and the other side is clamped into the front groove 3c to position the magnetic conductive block 3; every simultaneously 3 rear ends of magnetic conduction piece are equipped with back recess 3d, and be equipped with the end cover recess 101a relative with back recess 3d on the end cover 101, still include independent back navigation key 6, and this back navigation key 6 one side card is gone into in end cover recess 101a, and the opposite side card is gone into in order to fix a position magnetic conduction piece 3 in back recess 3 d. In addition, in this embodiment, the front positioning key 5 is a square key, and the front groove 3c and the pressing plate groove 4a are square grooves matched with the square key. The rear positioning key 6 is also a square key, and similarly, the rear groove 3d and the end cover groove 101a are square grooves matched with the square key.
Example 6: the overall structure of this embodiment is substantially the same as that of embodiment 5, except that in this embodiment, the front positioning key 5 is a round key, the front groove 3c and the pressing plate groove 4a are both semicircular grooves matched with the round key, the rear positioning key 6 is also a round key, and similarly, the rear groove 3d and the end cover groove 101a are both semicircular grooves matched with the round key, as shown in fig. 7.
The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.
Claims (10)
1. The outer rotor for the low-speed large-torque outer rotor motor comprises a shell (1), a magnetic conduction frame and magnetic steel (2), and is characterized in that the shell (1) comprises an end cover (101) and a positioning ring (102) formed on one surface of the end cover (101), the magnetic conduction frame is positioned on the inner periphery of the positioning ring (102), the magnetic conduction frame is formed by arranging a plurality of independent magnetic conduction blocks (3) along the circumference, the outer rotor further comprises a pressing plate (4) used for pressing the magnetic conduction frame on the end cover (101), and the pressing plate (4) is fixed to the end cover (101) by a plurality of axial fasteners (7); the left side and the right side of each magnetic conduction block (3) are respectively provided with a magnetic steel half clamping groove (301), and two magnetic steel half clamping grooves (301) which are opposite on two adjacent magnetic conduction blocks (3) on the circumference are jointly spliced into a magnetic steel clamping groove so as to radially embed the magnetic steel (2); and key groove matching structures are arranged between the front end of the magnetic conduction block (3) and the pressure plate (4) and between the rear end of the magnetic conduction block (3) and the end cover (101) to support and position the magnetic conduction block (3).
2. The outer rotor for a low-speed high-torque outer rotor motor according to claim 1, wherein the magnetic conduction blocks (3) are all powder metallurgy magnetic conduction blocks.
3. The outer rotor for the low-speed high-torque outer rotor motor according to claim 1, wherein the top surface of the magnetic conductive block (3) is an arc surface attached to the inner peripheral wall surface of the positioning ring (102).
4. The outer rotor for the low-speed high-torque outer rotor motor according to claim 1, wherein the magnetic steel half clamping grooves (301) are L-shaped clamping grooves, the radial width of the spliced magnetic steel clamping grooves is larger than the circumferential width of the spliced magnetic steel clamping grooves, and the top of the magnetic steel (2) abuts against the inner circumferential wall surface of the positioning ring (102).
5. The outer rotor for the low-speed high-torque outer rotor motor according to claim 1, wherein a front convex key (3 a) is formed at the front end of each magnetic conduction block (3), a pressing plate groove (4 a) matched with the front convex key (3 a) is formed in the pressing plate (4), a rear convex key (3 b) is formed at the rear end of each magnetic conduction block (3), and an end cover groove (101 a) matched with the rear convex key (3 b) is formed in the end cover (101); and the pressure plate groove (4 a) and the end cover groove (101 a) are internally provided with lifting inclined planes (B1) tending to extrude the magnetic conduction block (3) towards the direction of the positioning ring (102).
6. The external rotor for a low-speed high-torque external rotor motor according to claim 5, wherein the front convex key (3 a) and the rear convex key (3B) are provided with guiding inclined planes (B2) which are matched with the corresponding lifting inclined planes (B1).
7. The outer rotor for the low-speed high-torque outer rotor motor according to claim 1, wherein a front groove (3 c) is formed at the front end of each magnetic conduction block (3), a pressing plate groove (4 a) opposite to the front groove (3 c) is formed in the pressing plate (4), and the outer rotor further comprises an independent front positioning key (5), one side of the front positioning key (5) is clamped in the pressing plate groove (4 a), and the other side of the front positioning key is clamped in the front groove (3 c) to position the magnetic conduction block (3); every simultaneously magnetic conduction piece (3) rear end is equipped with back recess (3 d), and be equipped with end cover recess (101 a) relative with back recess (3 d) on end cover (101), still include independent back navigation key (6), this back navigation key (6) one side card is gone into in end cover recess (101 a), and the opposite side card is gone into in back recess (3 d) with location magnetic conduction piece (3).
8. The outer rotor for the low-speed high-torque outer rotor motor according to claim 1, wherein each magnetic conduction block (3) is fastened to the end cover (101) by the axial fastener (7) in a penetrating manner, or a part of the magnetic conduction blocks (3) is fastened to the end cover (101) by the axial fastener (7) in a penetrating manner.
9. The outer rotor for the low-speed high-torque outer rotor motor according to claim 8, wherein a number of the magnetic conduction blocks (3) is 1/3-1/2 of the total number of the magnetic conduction blocks (3).
10. The outer rotor for a low-speed high-torque outer rotor motor according to claim 1, wherein the axial fasteners (7) are screws, bolts or rivets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022064601.2U CN212435459U (en) | 2020-09-18 | 2020-09-18 | External rotor for low-speed large-torque external rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022064601.2U CN212435459U (en) | 2020-09-18 | 2020-09-18 | External rotor for low-speed large-torque external rotor motor |
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| CN212435459U true CN212435459U (en) | 2021-01-29 |
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| CN202022064601.2U Active CN212435459U (en) | 2020-09-18 | 2020-09-18 | External rotor for low-speed large-torque external rotor motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969746A (en) * | 2020-09-18 | 2020-11-20 | 苏州盛亿电机有限公司 | External rotor for low-speed large-torque external rotor motor |
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2020
- 2020-09-18 CN CN202022064601.2U patent/CN212435459U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969746A (en) * | 2020-09-18 | 2020-11-20 | 苏州盛亿电机有限公司 | External rotor for low-speed large-torque external rotor motor |
| CN111969746B (en) * | 2020-09-18 | 2024-05-31 | 苏州盛亿电机有限公司 | Outer rotor for low-speed large-torsion outer rotor motor |
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