A double-redundant permanent magnet AC servo motor

Abstract

The present invention relates to the technical field of motors, and specifically discloses a dual-redundancy permanent magnet AC servo motor, comprising a shell, a first opening and a plurality of vents are arranged on the shell; a rotating shaft, the rotating shaft is inserted into the first opening, and a first fan is connected to the rotating shaft; a driving mechanism, the driving mechanism comprises a stator and a rotor; a wind aggregation mechanism, the wind aggregation mechanism is adjacently arranged beside the first fan, the wind aggregation mechanism accelerates the wind, and forms a high-pressure area and a low-pressure area based on the Bernoulli principle, and the outside air in the high-pressure area is aggregated to a narrow channel in the low-pressure area through the second opening; the stator has two sets of windings, the stator is circumferentially provided with 24 wire slots, the number of stages is 5, the number of phases is three, each set of windings has 12 wire slots, each wire slot has a phase coil, and physical isolation of the wire slots is achieved; the present invention overcomes the defects of the prior art that the internal cooling performance of the motor is insufficient, condensed water is easily generated, and the electronic winding embedding structure is insufficiently optimized.

Description

Technical Field

[0001] The invention relates to the field of motors, in particular to a dual-redundancy permanent magnet AC servo motor. Background Art

[0002] Permanent magnet AC servo motor is a high reliability motor system, which improves the reliability and fault tolerance of the system by introducing redundancy technology. This motor system has broad application prospects in aerospace, industrial automation and other fields.

[0003] In the prior art, the internal cooling performance of the permanent magnet AC servo motor is insufficient, and condensed water is usually generated inside the motor, which has a significant impact on the operation of the motor. At the same time, the winding wire structure on the stator is not optimized enough. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The problem to be solved by the present invention is to provide a dual-redundancy permanent magnet AC servo motor to overcome the defects of the prior art motors, such as insufficient internal cooling performance, easy generation of condensed water and insufficient optimization of the electronic winding embedding structure.

[0006] (II) Technical solution

[0007] In order to solve the technical problem, the present invention provides a dual-redundancy permanent magnet AC servo motor, comprising:

[0008] A shell, wherein the shell is provided with a first opening and a plurality of vents;

[0009] a rotating shaft, one end of which is inserted into the first opening, and the other end of which is connected to a first fan;

[0010] A driving mechanism, the driving mechanism comprising a stator and a rotor, the rotor being connected to the rotating shaft, the stator being connected to the inner wall of the housing, a gap being provided between the stator and the rotor, a stator housing being provided outside the stator, and a rotor housing being provided outside the rotor;

[0011] A wind aggregation mechanism, the wind aggregation mechanism is located between the first fan and the stator, the wind aggregation mechanism includes a first arc-shaped aggregation block and a second arc-shaped aggregation block, the first arc-shaped aggregation block is connected to the stator housing, the second arc-shaped aggregation block is connected to the rotor housing, a plurality of second openings are provided on the first arc-shaped aggregation block, a narrow passage is provided between the first arc-shaped aggregation block and the second arc-shaped aggregation block, the narrow passage is used to accelerate wind, and based on the Bernoulli principle, the external air in the high-pressure area is aggregated to the narrow passage in the low-pressure area through the second openings;

[0012] The stator has two sets of windings, and 24 slots are arranged along the circumference of the stator, with 5 levels and three phases. Each set of windings has 12 slots, and each slot has a phase coil, so that the slots are physically isolated and the coils of each phase are independent of each other.

[0013] As for the permanent magnet AC servo motor as mentioned above, optionally, a water diversion groove and a third opening connected to the outside are provided at the inner bottom of the shell, and a solenoid valve is provided in the third opening.

[0014] As for the permanent magnet AC servo motor as mentioned above, optionally, a plurality of ventilation openings are evenly spaced and distributed on the shell, one end of the first pipe is connected to the ventilation opening, and the other end of the first pipe is connected to the other end of the shell.

[0015] As for the permanent magnet AC servo motor as mentioned above, optionally, a dustproof net is provided on each of the ventilation openings.

[0016] As the permanent magnet AC servo motor mentioned above, optionally, a drying mechanism is arranged between the first pipes, and the drying mechanism includes a drying shell and a drying end cover, the drying end cover is connected to the top of the shell, the drying end cover is threadedly connected to the drying shell, and a desiccant is placed inside the drying shell.

[0017] As for the permanent magnet AC servo motor as mentioned above, optionally, a spiral pipe is provided in the shell, and one end of the spiral pipe is connected to the other end of the spiral pipe outside the shell through a second pipe.

[0018] As described above, the permanent magnet AC servo motor may optionally have a cooling mechanism between the second pipes, the cooling mechanism being connected to the bottom end of the shell, the cooling mechanism comprising a cooling shell, a third pipe, a connecting pipe and tube fins, the third pipe being arranged in the cooling shell, the third pipe having a plurality of third pipes, the plurality of third pipes being evenly spaced, the connecting pipe connecting two adjacent third pipes, and the tube fins being correspondingly arranged on each of the third pipes.

[0019] As the permanent magnet AC servo motor described above, optionally, the water pump is connected to the second pipe, the cooling shell is provided with a motor, a transmission shaft and a second fan, the motor is connected to the interior of the cooling shell, the transmission shaft is connected to the output shaft of the motor, the second fan is connected to the transmission shaft, and the motor drives the second fan to rotate.

[0020] As for the permanent magnet AC servo motor as mentioned above, optionally, a bearing is provided between one end of the rotating shaft and the housing, and a bearing is provided between the other end of the rotating shaft and the rotor cover.

[0021] As mentioned above, the permanent magnet AC servo motor can optionally have two sets of windings and two sets of UVW three-phases completely physically isolated.

[0022] (III) Beneficial effects

[0023] The present invention provides a dual-redundancy permanent magnet AC servo motor, which has the following beneficial effects:

[0024] (1) The present invention connects the rotor to the rotating shaft, and connects the stator to the inner wall of the shell, with a gap between the stator and the rotor, and a first fan is arranged on the rotating shaft. The first fan is used to dissipate heat inside the engine, wherein a wind aggregation mechanism is arranged adjacent to the first fan, and a narrow channel is arranged between the first arc aggregation block and the second arc aggregation block of the wind aggregation mechanism. The narrow channel is used to accelerate the wind provided by the first fan. The wind is accelerated under the action of the narrow channel. Based on the Bernoulli principle, the greater the flow rate, the smaller the pressure. Therefore, a low-pressure area is formed in the narrow channel, and a high-pressure area is formed outside the narrow channel relative to the narrow channel. The outside air in the high-pressure area can be aggregated to the narrow channel in the low-pressure area through the second opening, thereby realizing the aggregation of more gas in the gap and the narrow channel, thereby improving the heat dissipation efficiency.

[0025] (2) The present invention provides two sets of windings on the stator, 24 wire slots are provided around the stator, the number of levels is 5, the number of phases is three, each set of windings has 12 wire slots, each wire slot has a phase coil, so that the wire slots are physically isolated and the coils of each phase are independent of each other. Among them, the two sets of windings and the two sets of UVW three-phases are completely physically isolated. This design can greatly weaken the mutual inductance between the windings of each phase, making the motor easier to control, and the end coils do not interfere with each other, which is beneficial to the heat dissipation of the motor. Moreover, this structure is also conducive to the automation of winding and embedding, which can improve production efficiency.

[0026] (3) The present invention is provided with a cooling mechanism outside the engine, and a spiral pipe is provided in the engine housing, the spiral pipe is connected to the cooling mechanism, the cooling mechanism has a plurality of second pipes, each of the second pipes is interconnected through a connecting pipe, a tube fin is provided on the second pipe, and the motor driving transmission shaft in the cooling housing is provided to drive the second fan to rotate, and the second fan drives the circulating water passing through the cooling mechanism and cools the circulating water. The tube fin can expand the contact area of ​​the second fan wind, thereby making the cooling more efficient, and the plurality of second pipes can also increase the flow distance of the circulating water, further improving the cooling effect.

[0027] (4) The present invention provides a water diversion trough at the bottom of the engine, and the condensed water that is not completely filtered can flow into the water diversion trough under the guidance of the water diversion trough. A third opening is provided at the bottom of the water diversion trough, and the solenoid valve can control the opening and closing of the third opening, thereby further preventing the engine from being affected by the condensed water.

[0028] (5) A first pipe is connected to the outside of the engine, and the first pipe can realize the internal circulation of wind in the engine. A drying mechanism is also arranged between the first pipes. There is a desiccant in the drying mechanism. The desiccant can be easily replaced by unscrewing the drying end cover. The drying mechanism can dehumidify the inside of the engine, thereby preventing condensed water from affecting the internal components of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A cross-sectional view of a dual-redundancy permanent magnet AC servo motor of the present invention;

[0031] Figure 2 A partial cross-sectional view of a dual-redundancy permanent magnet AC servo motor of the present invention;

[0032] Figure 3 A partial cross-sectional view of another part of a dual-redundancy permanent magnet AC servo motor of the present invention;

[0033] Figure 4 It is a cross-sectional view of a cold cutting mechanism of a double-redundant permanent magnet AC servo motor of the present invention;

[0034] Figure 5 It is a three-dimensional cross-sectional view of a cold cutting mechanism of a double-redundant permanent magnet AC servo motor of the present invention;

[0035] Figure 6 A three-dimensional cross-sectional view of a dual-redundancy permanent magnet AC servo motor of the present invention from another perspective;

[0036] Figure 7 A stator winding embedding diagram of a dual-redundancy permanent magnet AC servo motor of the present invention;

[0037] Figure 8 The present invention discloses a wiring diagram of a stator winding of a dual-redundancy permanent magnet AC servo motor.

[0038] The names of the components corresponding to the various figure marks in the figure are: 1. shell; 11. first opening; 12. vent; 2. shaft; 21. first fan; 3. driving mechanism; 31. stator; 32. rotor; 33. gap; 34. stator cover; 35. rotor cover; 4. wind aggregation mechanism; 41. first arc-shaped aggregation block; 42. second arc-shaped aggregation block; 43. second opening; 44. narrow channel; 45. wire groove; 46. water diversion groove; 47. third opening; 48. solenoid valve; 51. first pipeline; 52. dustproof net; 53. drying mechanism; 54. drying shell; 55. drying end cover; 56. desiccant; 61. spiral pipeline; 62. second pipeline; 7. cooling mechanism; 71. cooling shell; 72. third pipeline; 73. connecting pipeline; 74. tube fin; 75. water pump; 76. motor; 77. transmission shaft; 78. second fan; 8. bearing. DETAILED DESCRIPTION

[0039] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0041] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0042] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0043] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0044] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0045] See also Figures 1 to 8 The present invention provides a dual-redundancy permanent magnet AC servo motor, comprising: a housing 1, a rotating shaft 2, a driving mechanism 3, a wind aggregation mechanism 4 and a cooling mechanism 7. The rotating shaft 2 is inserted into the housing 1, the driving mechanism 3 is a stator 31 and a rotor 32, which can drive the rotating shaft 2 to rotate, the wind aggregation mechanism 4 can aggregate greater wind power, thereby cooling the inside of the motor 76, and the cooling mechanism 7 can cool the motor, so as to keep it in a stable working state.

[0046] exist Figure 1 middle Figure 8 In an optional embodiment, the housing 1 is provided with a first opening 11 and a plurality of vents 12. One end of the rotating shaft 2 is inserted into the first opening 11, and the other end of the rotating shaft 2 is connected to a first fan 21.

[0047] Furthermore, a plurality of ventilation openings 12 are evenly spaced on the shell 1 , one end of the first pipe 51 is connected to the ventilation opening 12 , and the other end of the first pipe 51 is connected to the other end of the shell 1 .

[0048] Furthermore, a dustproof net 52 is provided on each vent 12. Wind inside the motor can be input into the first duct 51 through the vent 12, and the dustproof net 52 can isolate external dust.

[0049] Furthermore, a bearing 8 is provided between one end of the rotating shaft 2 and the housing 1 , and a bearing 8 is provided between the other end of the rotating shaft 2 and the rotor housing 35 .

[0050] exist Figure 1 middle Figure 8 In an optional embodiment, the driving mechanism 3 includes a stator 31 and a rotor 32, the rotor 32 is connected to the rotating shaft 2, the stator 31 is connected to the inner wall of the housing 1, there is a gap 33 between the stator 31 and the rotor 32, the outside of the stator 31 has a stator cover 34, and the outside of the rotor 32 has a rotor cover 35.

[0051] exist Figures 1 to 8 In an optional embodiment, the wind aggregation mechanism 4 is located between the first fan 21 and the stator 31, and the wind aggregation mechanism 4 includes a first arc-shaped aggregation block 41 and a second arc-shaped aggregation block 42. The first arc-shaped aggregation block 41 is connected to the stator cover 34, and the second arc-shaped aggregation block 42 is connected to the rotor cover 35. A plurality of second openings 43 are provided on the first arc-shaped aggregation block 41, and a narrow channel 44 is provided between the first arc-shaped aggregation block 41 and the second arc-shaped aggregation block 42. The narrow channel 44 is used to accelerate wind force. Based on the Bernoulli principle, the external air in the high-pressure area is aggregated to the narrow channel 44 in the low-pressure area through the second openings 43.

[0052] exist Figures 1 to 8 In an optional embodiment, the stator 31 has two sets of windings, and the stator 31 is provided with 24 wire slots 45 along the circumference, the number of levels is 5, and the number of phases is three phases. Each set of windings has 12 wire slots 45, and each wire slot 45 has a phase coil, so that the wire slots 45 are physically isolated, and the coils of each phase are independent of each other.

[0053] Furthermore, the two sets of windings and the two sets of UVW three-phases are completely physically isolated.

[0054] Furthermore, a water diversion groove 46 and a third opening 47 connected to the outside are provided at the inner bottom of the housing 1, and a solenoid valve 48 is provided in the third opening 47. Condensed water inside the motor can flow in under the guidance of the water diversion groove 46, and the solenoid valve 48 controls the condensed water to flow out of the third opening 47.

[0055] exist Figure 1 middle Figure 8 In an optional embodiment, a drying mechanism 53 is provided between the first pipes 51, and the drying mechanism 53 includes a drying shell 54 and a drying end cover 55, the drying end cover 55 is connected to the top of the housing 1, the drying end cover 55 is threadedly connected to the drying shell 54, and a desiccant 56 is placed inside the drying shell 54. The operator can replace the internal desiccant 56 by unscrewing the drying end cover 55, which greatly improves convenience.

[0056] exist Figure 1 middle Figure 8 In an optional embodiment, a spiral pipe 61 is provided in the shell 1 , and one end of the spiral pipe 61 is connected to the other end of the spiral pipe 61 outside the shell 1 through a second pipe 62 .

[0057] Furthermore, a cooling mechanism 7 is provided between the second pipes 62, and the cooling mechanism 7 is connected to the bottom end of the shell 1. The cooling mechanism 7 includes a cooling shell 71, a third pipe 72, a connecting pipe 73 and a tube fin 74. The third pipe 72 is arranged in the cooling shell 71, and there are multiple third pipes 72. The multiple third pipes 72 are evenly spaced. The connecting pipe 73 connects two adjacent third pipes 72, and the tube fin 74 is correspondingly arranged on each third pipe 72.

[0058] Furthermore, the water pump 75 is connected to the second pipe 62, and a motor 76, a transmission shaft 77 and a second fan 78 are provided on the cooling shell 71. The motor 76 is connected to the interior of the cooling shell 71, the transmission shaft 77 is connected to the output shaft of the motor 76, the second fan 78 is connected to the transmission shaft 77, and the motor 76 drives the second fan 78 to rotate.

[0059] A dual-redundancy permanent magnet AC servo motor of the present invention comprises the following specific steps:

[0060] By connecting the rotor 32 to the rotating shaft 2, and connecting the stator 31 to the inner wall of the shell 1, a gap 33 is formed between the stator 31 and the rotor 32, and a first fan 21 is arranged on the rotating shaft 2, and the first fan 21 is used for internal heat dissipation of the engine, wherein adjacent first fans 21 are provided with a wind aggregation mechanism 4, and a narrow channel 44 is provided between the first arc aggregation block 41 and the second arc aggregation block 42 of the wind aggregation mechanism 4, and the narrow channel 44 is used to accelerate the wind provided by the first fan 21. The wind is accelerated under the action of the narrowness. Based on the Bernoulli principle, the greater the flow rate, the smaller the pressure. Therefore, a low-pressure area is formed in the narrow channel 44, and a high-pressure area is formed outside the narrow channel 44 relative to the narrow channel 44. The outside air in the high-pressure area can be aggregated to the narrow channel 44 in the low-pressure area through the second opening 43, thereby realizing the aggregation of more gases in the gap 33 and the narrow channel 44, thereby improving the heat dissipation efficiency.

[0061] By arranging two sets of windings on the stator 31, 24 wire slots 45 are arranged around the stator 31, the number of levels is 5, the number of phases is three-phase, each set of windings has 12 wire slots 45, and each wire slot 45 has a phase coil, so that the wire slots 45 are physically isolated and the coils of each phase are independent of each other. Among them, the two sets of windings and the two sets of UVW three-phases are completely physically isolated. This design can greatly weaken the mutual inductance between the windings of each phase, making the motor easier to control, and the end coils do not interfere with each other, which is beneficial to the heat dissipation of the motor. Moreover, this structure is also conducive to the automation of winding and embedding, which can improve production efficiency.

[0062] A cooling mechanism 7 is provided outside the engine, and a spiral pipe 61 is provided in the engine housing 1, the spiral pipe 61 is connected to the cooling mechanism 7, and a plurality of second pipes 62 are provided in the cooling mechanism 7, each of the second pipes 62 is interconnected through a connecting pipe 73, and a tube fin 74 is provided on the second pipe 62, which is provided with a motor 76 in the cooling housing 71 to drive a transmission shaft 77, thereby driving a second fan 78 to rotate, and the second fan 78 drives the circulating water passing through the inside of the cooling mechanism 7 and cools the circulating water. Among them, the tube fin 74 can expand the contact area of ​​the wind of the second fan 78, thereby making the cooling more efficient, and the plurality of second pipes 62 can also increase the flow distance of the circulating water, further improving the cooling effect.

[0063] By setting a water diversion groove 46 at the bottom of the engine, the condensed water that is not completely filtered can flow into the water diversion groove 46 under the guidance of the water diversion groove 46. A point opening is set at the bottom end of the water diversion groove 46. The solenoid valve 48 can control the opening and closing of the third opening 47, so as to further prevent the engine from being affected by the condensed water.

[0064] By connecting a first pipe 51 to the outside of the engine, the first pipe 51 can realize the internal circulation of wind force in the engine. A drying mechanism 53 is also arranged between the first pipes 51. There is a desiccant 56 in the drying mechanism 53. The drying mechanism 53 can conveniently replace the desiccant 56 by unscrewing the drying end cover 55. The drying mechanism 53 can dehumidify the inside of the engine, so as to prevent condensed water from affecting the internal components of the engine.

[0065] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A dual-redundancy permanent magnet AC servo motor, characterized in that: include: A shell (1), wherein the shell (1) is provided with a first opening (11) and a plurality of ventilation holes (12); A rotating shaft (2), one end of the rotating shaft (2) being inserted into the first opening (11), and the other end of the rotating shaft (2) being connected to a first fan (21); A driving mechanism (3), the driving mechanism (3) comprising a stator (31) and a rotor (32), the rotor (32) being connected to the rotating shaft (2), the stator (31) being connected to the inner wall of the housing (1), a gap (33) being provided between the stator (31) and the rotor (32), the stator (31) having a stator cover (34) on the outside, and the rotor (32) having a rotor cover (35) on the outside; A wind aggregation mechanism (4), the wind aggregation mechanism (4) being located between the first fan (21) and the stator (31), the wind aggregation mechanism (4) comprising a first arc-shaped aggregation block (41) and a second arc-shaped aggregation block (42), the first arc-shaped aggregation block (41) being connected to the stator housing (34), the second arc-shaped aggregation block (42) being connected to the rotor housing (35), a plurality of second openings (43) being provided on the first arc-shaped aggregation block (41), a narrow passage (44) being provided between the first arc-shaped aggregation block (41) and the second arc-shaped aggregation block (42), the narrow passage (44) being used to accelerate wind, and based on the Bernoulli principle, external air in a high-pressure area is aggregated toward the narrow passage (44) in a low-pressure area through the second openings (43); The stator (31) has two sets of windings. The stator (31) is provided with 24 wire slots (45) along the circumference. The number of levels is five and the number of phases is three. Each set of windings has 12 wire slots (45). Each wire slot (45) has a phase coil, so that the wire slots (45) are physically isolated and the coils of each phase are independent of each other.

2. The permanent magnet AC servo motor according to claim 1, characterized in that: The inner bottom of the housing (1) is provided with a water diversion groove (46) and a third opening (47) communicating with the outside, and the third opening (47) is provided with a solenoid valve (48).

3. The permanent magnet AC servo motor according to claim 1, characterized in that: The plurality of ventilation openings (12) are distributed on the shell (1) at equal intervals, one end of the first pipe (51) is connected to the ventilation opening (12), and the other end of the first pipe (51) is connected to the other end of the shell (1).

4. The permanent magnet AC servo motor according to claim 3, characterized in that: A dustproof net (52) is provided on each of the ventilation openings (12).

5. The permanent magnet AC servo motor according to claim 3, characterized in that: A drying mechanism (53) is provided between the first pipes (51), the drying mechanism (53) comprising a drying shell (54) and a drying end cover (55), the drying end cover (55) being connected to the top end of the shell (1), the drying end cover (55) being threadedly connected to the drying shell (54), and a desiccant (56) being placed inside the drying shell (54).

6. The permanent magnet AC servo motor according to claim 1, characterized in that: A spiral pipe (61) is provided in the shell (1), and one end of the spiral pipe (61) is connected to the other end of the spiral pipe (61) outside the shell (1) through a second pipe (62).

7. The permanent magnet AC servo motor according to claim 6, characterized in that: A cooling mechanism (7) is provided between the second pipes (62), the cooling mechanism (7) being connected to the bottom end of the shell (1), the cooling mechanism (7) comprising a cooling shell (71), a third pipe (72), a connecting pipe (73) and a tube fin (74), the third pipe (72) being arranged in the cooling shell (71), the third pipe (72) comprising a plurality of third pipes (72), the plurality of third pipes (72) being distributed at equal intervals, the connecting pipe (73) being connected to two adjacent third pipes (72), and the tube fin (74) being correspondingly arranged on each of the third pipes (72).

8. The permanent magnet AC servo motor according to claim 7, characterized in that: The water pump (75) is in communication with the second pipe (62); a motor (76), a transmission shaft (77) and a second fan (78) are provided on the cooling shell (71); the motor (76) is connected to the interior of the cooling shell (71); the transmission shaft (77) is connected to the output shaft of the motor (76); the second fan (78) is connected to the transmission shaft (77); and the motor (76) drives the second fan (78) to rotate.

9. The permanent magnet AC servo motor according to claim 1, characterized in that: A bearing (8) is provided between one end of the rotating shaft (2) and the housing (1), and a bearing (8) is provided between the other end of the rotating shaft (2) and the rotor cover (35).

10. The permanent magnet AC servo motor according to claim 1, characterized in that: Two sets of windings and two sets of UVW three-phases are completely physically isolated.

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