Permanent magnet synchronous servo motor rotor structure

Abstract

A permanent magnet synchronous servo motor rotor structure belongs to the technical field of motors. Comprising a rotor shaft, a rotor core and a plurality of permanent magnets. The rotor shaft is arranged at the center of the rotor iron core; and the permanent magnet is rotationally arranged on the outer ring of the rotor shaft through the embedding hole. According to the rotor iron core, a plurality of iron cores are not separated and are of an integral structure, so that magnetic resistance can be reduced, and the assembling efficiency can be improved while leakage magnetic flux is blocked; the permanent magnets are arranged in the embedding holes, so that the permanent magnets are not exposed to an external demagnetizing field, the magnetic flux leakage amount is not reduced, the magnetic flux is not changed, and the power density of the motor is not influenced; the rotor structure provided by the utility model can reduce the magnetic leakage amount while reducing the assembly cost, thereby improving the power density.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a permanent magnet synchronous servo motor rotor structure. Background Art

[0002] During motor operation, magnetic flux lines do not fully pass through the working magnetic circuit due to the influence of the magnetic field, resulting in magnetic flux leakage. This leakage leads to reduced motor efficiency and increased iron losses, which in turn affects the motor's performance and lifespan. For permanent magnet synchronous motors, demagnetization may cause problems such as decreased dynamic performance, speed fluctuations, and power loss. When the rotor permanent magnets are exposed to the external demagnetization field or when the gaps between the rotor cores are large, this can lead to a reduction in magnetic flux, affecting the motor's power density.

[0003] Therefore, a permanent magnet synchronous servo motor rotor structure is urgently needed to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a permanent magnet synchronous servo motor rotor structure to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a permanent magnet synchronous servo motor rotor structure, comprising a rotor shaft, a rotor core and a plurality of permanent magnets; the rotor shaft is arranged at the center of the rotor core; the permanent magnet is rotatably arranged on the outer ring of the rotor shaft through an embedded hole.

[0006] The rotor cores are located between a plurality of permanent magnets, namely core 1, core 2, core 3, core 4, core 5, core 6, core 7 and core 8; cores 1 to 8 are connected to each other.

[0007] The center of the rotor core is provided with an axial hole for placing the rotor shaft, and the rotor core is provided with holes corresponding to the cores one by one.

[0008] The shapes of the embedding holes correspond to those of the permanent magnets, and the embedding holes are respectively embedded hole one, embedded hole two, embedded hole three, embedded hole four, embedded hole five, embedded hole six, embedded hole seven and embedded hole eight.

[0009] A connecting hole one is formed between the embedded hole one and the shaft hole, and the embedded hole one and the shaft hole are connected through the connecting hole one; a connecting hole two is formed between the embedded hole two and the shaft hole, and the embedded hole two and the shaft hole are connected through the connecting hole two; a connecting hole three is formed between the embedded hole five and the shaft hole, and the embedded hole five and the shaft hole are connected through the connecting hole three; a connecting hole four is formed between the embedded hole six and the shaft hole, and the embedded hole six and the shaft hole are connected through the connecting hole four.

[0010] The iron core eight and the iron core one are connected at the end of the embedded hole one away from the shaft hole; the iron core one and the iron core two are connected at the end of the embedded hole two away from the shaft hole; the iron core four and the iron core five are connected at the end of the embedded hole five away from the shaft hole; the iron core five and the iron core six are connected at the end of the embedded hole six away from the shaft hole.

[0011] The iron core two and the iron core three are connected between the embedded hole three and the shaft hole, and the embedded hole three is provided with a slot one at one end away from the shaft hole; the iron core three and the iron core four are connected between the embedded hole four and the shaft hole, and the embedded hole four is provided with a slot two at one end away from the shaft hole; the iron core six and the iron core seven are connected between the embedded hole seven and the shaft hole, and the embedded hole seven is provided with a slot three at one end away from the shaft hole; the iron core seven and the iron core eight are connected between the embedded hole eight and the shaft hole, and the embedded hole eight is provided with a slot four at one end away from the shaft hole.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The rotor core of the utility model is not divided into multiple cores and is an integral structure, which can reduce magnetic resistance and improve assembly efficiency while blocking leakage magnetic flux. The permanent magnets are arranged in the embedded holes, so that the permanent magnets are not exposed to the external demagnetization field, and the leakage magnetic flux is not reduced, resulting in changes in magnetic flux and affecting the power density of the motor.

[0014] The rotor structure of the utility model can reduce the assembly cost and the magnetic leakage at the same time, thereby improving the power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a permanent magnet synchronous servo motor rotor structure;

[0016] In the figure: 1. rotor shaft; 11. shaft hole; 2. rotor core; 21. core one; 22. core two; 23. core three; 24. core four; 25. core five; 26. core six; 27. core seven; 28. core eight; 3. permanent magnet; 4. embedding hole; 41. embedding hole one; 42. embedding hole two; 43. embedding hole three; 44. embedding hole four; 45. embedding hole five; 46. embedding hole six; 47. embedding hole seven; 48. embedding hole eight; 51. connecting hole one; 52. connecting hole two; 53. connecting hole three; 54. connecting hole four; 61. slot one; 62. slot two; 63. slot three; 64. slot four; 7. hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments 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 efforts are within the scope of protection of the present invention.

[0018] See also Figure 1 The utility model provides a technical solution: a permanent magnet synchronous servo motor rotor structure, including a rotor shaft 1, a rotor core 2 and a plurality of permanent magnets 3; the rotor shaft 1 is arranged at the center of the rotor core 2; the permanent magnet 3 is rotatably arranged on the outer ring of the rotor shaft 1 through an embedding hole 4.

[0019] The permanent magnets 3 can generate magnetic flux. The present invention provides eight permanent magnets 3 , but the present invention is not limited to eight permanent magnets. A variable number of permanent magnets 3 can be buried as needed.

[0020] The rotor core 2 is located between multiple permanent magnets 3, namely core 1 21, core 2 22, core 3 23, core 4 24, core 5 25, core 6 26, core 7 27, and core 8 28. Cores 1 21 through 8 28 are interconnected. The number of rotor cores 2 in the present invention is determined by the number of permanent magnets 3.

[0021] The rotor core 2 is provided with a shaft hole 11 at its center for receiving the rotor shaft 1. The rotor core 2 is provided with holes 7 that correspond one to one with the core. The arrangement of holes 7 can optimize the distribution of the magnetic field and the coupling efficiency, thereby improving the overall performance of the motor.

[0022] The shapes of the embedding holes 4 correspond to those of the permanent magnets 3 , and the embedding holes 4 are respectively embedded hole 1 41 , embedded hole 2 42 , embedded hole 3 43 , embedded hole 44 , embedded hole 5 45 , embedded hole 6 46 , embedded hole 7 47 and embedded hole 8 48 .

[0023] A connecting hole 51 is formed between the embedding hole 41 and the shaft hole 11 , and the embedding hole 41 and the shaft hole 11 are connected via the connecting hole 51 .

[0024] A second connecting hole 52 is formed between the second embedding hole 42 and the shaft hole 11 , and the second embedding hole 42 and the shaft hole 11 are connected via the second connecting hole 52 .

[0025] A connecting hole three 53 is formed between the embedded hole five 45 and the shaft hole 11 , and the embedded hole five 45 and the shaft hole 11 are connected via the connecting hole three 53 .

[0026] A connecting hole four 54 is formed between the embedded hole six 46 and the shaft hole 11, and the embedded hole six 46 and the shaft hole 11 are connected through the connecting hole four 54.

[0027] The iron core eight 28 and the iron core one 21 are connected at one end of the embedding hole one 41 away from the shaft hole 11.

[0028] The iron core 1 21 and the iron core 2 22 are connected at one end of the second embedding hole 42 away from the shaft hole 11 .

[0029] The iron core 4 24 and the iron core 5 25 are connected at one end of the embedded hole 5 45 away from the shaft hole 11.

[0030] The fifth iron core 25 and the sixth iron core 26 are connected at one end of the embedding hole 46 away from the shaft hole 11.

[0031] The second iron core 22 and the third iron core 23 are connected between the third embedding hole 43 and the shaft hole 11 , and a first notch 61 is provided at one end of the third embedding hole 43 away from the shaft hole 11 .

[0032] The iron core three 23 and the iron core four 24 are connected between the embedding hole four 44 and the shaft hole 11 , and a notch two 62 is provided at one end of the embedding hole four 44 away from the shaft hole 11 .

[0033] The iron core six 26 and the iron core seven 27 are connected between the embedding hole seven 47 and the shaft hole 11 , and a notch three 63 is provided at one end of the embedding hole seven 47 away from the shaft hole 11 .

[0034] The iron core seven 27 and the iron core eight 28 are connected between the embedding hole eight 48 and the shaft hole 11, and a notch four 64 is provided at one end of the embedding hole eight 48 away from the shaft hole 11.

[0035] When the motor is running, it generates a magnetic field. Irregular magnetic fields can increase vibration and noise during motor operation. By providing irregular slots on the outer ring of the rotor core 2, the high-order harmonic components in the magnetic field can be effectively reduced, thereby reducing the vibration and noise of the motor.

[0036] The rotor core 2 of the present invention is not divided into multiple cores and is an integral structure, which can reduce magnetic resistance and improve assembly efficiency while blocking leakage magnetic flux.

[0037] The permanent magnet 3 of the present invention is arranged in the embedding hole 4, so that the permanent magnet is not exposed to the external demagnetizing field, and the leakage magnetic amount is not reduced, resulting in changes in magnetic flux and affecting the motor power density.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet synchronous servo motor rotor structure, characterized in that: The invention comprises a rotor shaft (1), a rotor core (2) and a plurality of permanent magnets (3); the rotor shaft (1) is arranged at the center of the rotor core (2); the permanent magnets (3) are rotatably arranged on the outer ring of the rotor shaft (1) through an embedding hole (4); the rotor core (2) is located between the plurality of permanent magnets (3), namely, core 1 (21), core 2 (22), core 3 (23), core 4 (24), core 5 (25), core 6 (26), core 7 (27) and core 8 (28); cores 1 (21) to 8 (28) are connected to each other.

2. The permanent magnet synchronous servo motor rotor structure according to claim 1, characterized in that: The center of the rotor core (2) is provided with an axial hole (11) for placing the rotor shaft (1), and the rotor core (2) is provided with holes (7) corresponding one to one with the core.

3. The permanent magnet synchronous servo motor rotor structure according to claim 1, characterized in that: The shapes of the embedding holes (4) and the permanent magnets (3) correspond to each other, and the embedding holes (4) are respectively embedded hole one (41), embedded hole two (42), embedded hole three (43), embedded hole four (44), embedded hole five (45), embedded hole six (46), embedded hole seven (47) and embedded hole eight (48).

4. The permanent magnet synchronous servo motor rotor structure according to claim 3, characterized in that: A connecting hole (51) is formed between the embedded hole (41) and the shaft hole (11), and the embedded hole (41) and the shaft hole (11) are connected through the connecting hole (51); a connecting hole (52) is formed between the embedded hole (42) and the shaft hole (11), and the embedded hole (42) and the shaft hole (11) are connected through the connecting hole (52); a connecting hole (3) is formed between the embedded hole (45) and the shaft hole (11), and the embedded hole (45) and the shaft hole (11) are connected through the connecting hole (53); a connecting hole (4) is formed between the embedded hole (46) and the shaft hole (11), and the embedded hole (46) and the shaft hole (11) are connected through the connecting hole (4) (54).

5. The permanent magnet synchronous servo motor rotor structure according to claim 1, characterized in that: The iron core eight (28) and the iron core one (21) are connected at one end of the embedded hole one (41) away from the shaft hole (11); the iron core one (21) and the iron core two (22) are connected at one end of the embedded hole two (42) away from the shaft hole (11); the iron core four (24) and the iron core five (25) are connected at one end of the embedded hole five (45) away from the shaft hole (11); the iron core five (25) and the iron core six (26) are connected at one end of the embedded hole six (46) away from the shaft hole (11).

6. The permanent magnet synchronous servo motor rotor structure according to claim 1, characterized in that: The second iron core (22) and the third iron core (23) are connected between the embedded hole (43) and the shaft hole (11), and the end of the embedded hole (43) away from the shaft hole (11) is provided with a notch (61); the third iron core (23) and the fourth iron core (24) are connected between the embedded hole (44) and the shaft hole (11), and the end of the embedded hole (44) away from the shaft hole (11) is provided with a notch (62); the sixth iron core (26) and the seventh iron core (27) are connected between the embedded hole (47) and the shaft hole (11), and the end of the embedded hole (47) away from the shaft hole (11) is provided with a notch (63); the seventh iron core (27) and the eighth iron core (28) are connected between the embedded hole (48) and the shaft hole (11), and the end of the embedded hole (48) away from the shaft hole (11) is provided with a notch (64).

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