Totally-closed outer rotor motor

Abstract

The totally-enclosed external rotor motor comprises an external rotor assembly and an internal stator assembly, the external rotor assembly comprises a casing, an end cover and a permanent magnet, the internal stator assembly comprises a stator core and a stator support, and the stator support is provided with an open cavity 1. Two sets of bearings are further arranged on the outer wall of the stator support, the inner edge of the end cover is installed on the stator support through the bearings, and a second closed cavity is defined by the stator support, the bearings, the end cover and the machine shell. The motor also comprises a fixed seat and spokes. The fixed seat is fixed on the stator support through the spokes. One end of the heat conduction part is located in the second cavity, and the other end of the heat conduction part penetrates through the stator support and then extends into the first cavity. According to the totally-closed outer rotor motor, the outer rotor assembly and the inner stator assembly are sealed in the closed space, so that the protection level is greatly improved, and the reliability of the motor is improved; and heat in the closed cavity II is led out to the open cavity I through the heat pipe for heat dissipation, so that the problem of difficulty in internal heat dissipation of the fully-sealed outer rotor motor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a fully enclosed outer rotor motor. Background Art

[0002] Outer rotor motors are often designed to be open to facilitate heat dissipation of the internal stator. However, the open structure is easily affected by the external environment, resulting in reduced reliability. Designing an outer rotor motor as a closed type can greatly improve its reliability, but a major problem faced by closed outer rotor motors is the difficulty in dissipating heat from the internal stator. Summary of the invention

[0003] The object of the present invention is to provide a fully enclosed outer rotor motor, which can conduct the internal heat of the motor to the outside through a heat conduction component, so as to overcome the defect of the enclosed outer rotor motor in the prior art that it is difficult to dissipate heat.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows:

[0005] A fully enclosed outer rotor motor includes a coaxially arranged outer rotor assembly and an inner stator assembly, wherein the outer rotor assembly includes a casing, an end cover and a permanent magnet, and the inner stator assembly includes a stator core and a stator bracket. The two ends of the casing are fixed to the outer edges of the end cover, and the stator core is fixed to the outer wall of the stator bracket. The stator bracket has a cavity one, and the cavity one is an open space. There are also two sets of bearings on the outer wall of the stator bracket, and the two sets of bearings are located on both sides of the stator core. The inner edge of the end cover is installed on the stator bracket through bearings. The stator bracket, bearings, end cover and casing together form a cavity two, and the cavity two is a closed space. It also includes a fixing seat and spokes, and the fixing seat is fixed to the stator bracket through the spokes;

[0006] It also includes a heat conducting component, one end of which is located in cavity 2, and the other end of which passes through the stator bracket and extends into cavity 1. The heat in cavity 2 is conducted to cavity 1 for heat dissipation through the heat conducting component, and cavity 1 constitutes a heat dissipation cavity.

[0007] Furthermore, the stator bracket is a hollow cylinder with openings at both ends, the interior of the hollow cylinder forms a cavity one, the fixing seat and the spokes are located in the cavity one, one end of the spoke is connected to the inner wall of the stator bracket, and the other end of the spoke is connected to the fixing seat.

[0008] Furthermore, the stator bracket, the fixing seat and the spokes are made of an integrally formed aluminum alloy.

[0009] Furthermore, the heat-conducting component is a heat pipe, and the other end of the heat pipe passes through the stator bracket in the radial direction.

[0010] Furthermore, the outer periphery of the stator core has a plurality of stator teeth, the inner periphery of the stator core has a stator yoke, the stator teeth have coils, and also include slot wedges, the slot wedges are stuck between adjacent coils, and one end of the heat pipe is fixed in the slot wedges. Preferably, the slot wedges are made of aluminum nitride ceramics.

[0011] Furthermore, the stator teeth are parallel teeth with dovetail portions, the prefabricated coils are rectangular coils, the slot wedges include a wedge-shaped tail portion, a strut head portion and two lateral wedge-shaped portions, the lateral wedge-shaped portions are located at the junction of the wedge-shaped tail portion and the strut head portion, the lateral wedge-shaped portions are clamped between the rectangular coil and the dovetail portion, the wedge-shaped tail portion is clamped between adjacent coils, the strut head portion is clamped between the dovetail portions of two adjacent stator teeth, and the slot wedge also has a first axial through hole, the first axial through hole is located between the two lateral wedge-shaped portions, and one end of the heat pipe is fixed in the first axial through hole.

[0012] Furthermore, the spokes are provided with a second axial through hole, and the other end of the heat pipe is bent and inserted into the second axial through hole after passing through the stator bracket.

[0013] Furthermore, the bearing is a T-shaped needle roller bearing, which includes an axial portion and a radial portion. The inner edge of the end cover has a first groove, and the radial portion of the T-shaped needle roller bearing is stuck in the first groove.

[0014] Furthermore, it also includes a sealing ring, the inner edge of the end cover, the T-shaped needle bearing and the stator bracket together form a second groove, and the sealing ring is stuck in the second groove. Preferably, the sealing ring is a lip-shaped sealing ring.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The fully enclosed outer rotor motor of the present invention adopts a sealed casing, end cover and stator bracket, and the outer rotor assembly and the inner stator assembly are sealed in a closed space, the protection level is greatly improved, and the reliability of the motor is improved; the heat in the closed cavity 2 is exported to the open cavity 1 for heat dissipation through the heat pipe, which solves the problem of internal heat dissipation difficulty of the fully enclosed outer rotor motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of a fully enclosed outer rotor motor according to Embodiment 1 of the present invention;

[0018] Figure 2 is a schematic structural diagram of an outer rotor assembly in Embodiment 1 of the present invention;

[0019] Figure 3 is a schematic diagram of the inner stator structure in Example 1 of the present invention (without slot wedges and heat pipes installed);

[0020] Figure 4 1 is a schematic diagram (partial) of the structure of the inner stator in Embodiment 1 of the present invention after the slot wedges and the heat pipe are installed;

[0021] Figure 5 is a real picture of the T-shaped needle roller bearing used in Example 1 of the present invention;

[0022] Figure 6 Schematic diagram of the assembly relationship between the T-shaped needle roller bearing, the stator bracket and the end cover in Example 1 of the present invention;

[0023] Figure 7 is a schematic diagram of the slot wedge structure in Example 1 of the present invention;

[0024] Figure 8 is a schematic diagram of the assembly of the slot wedge and the heat pipe in Example 1 of the present invention;

[0025] Fig. 9 Schematic diagram of the inner stator structure in Embodiment 2 of the present invention (partial);

[0026] Fig.10 is a schematic diagram of the assembly of the slot wedge and the heat pipe in Example 2 of the present invention;

[0027] above Figure 1-10 In the embodiment, the housing 1; the end cover 2; the first groove 201; the permanent magnet 3; the stator bracket 4; the spoke 401; the second axial through hole 402; the stator teeth 5; the dovetail 501; the stator yoke 6; the coil 7; the slot wedge 8; the wedge tail 801; the support bar head 802; the lateral wedge 803; the first axial through hole 804; the heat pipe 9; the T-shaped needle roller bearing 10; the sealing ring 11; the second groove 12; the ceramic end ring 13; the fixing seat 14. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1-4 As shown, a fully enclosed outer rotor motor includes an outer rotor assembly and an inner stator assembly which are coaxially arranged. The outer rotor assembly includes a housing 1, an end cover 2 and a permanent magnet 3. The permanent magnet 3 is fixed to the inner wall of the housing 1. The end cover 2 is circular with a hole in the middle. The two ends of the housing 1 are fixed to the outer edge of the end cover 2. The inner stator assembly includes a stator core and a stator bracket 4. The outer periphery of the stator core has a circle of stator teeth 5 distributed at equal intervals. The inner periphery of the stator core has a stator yoke 6. The stator teeth 5 have coils 7.

[0031] The stator support 4 is a hollow cylinder with two ends open, and the hollow cylinder has an open cavity. The stator yoke 6 is fixed to the outer wall of the stator support 4. The outer walls at both ends of the stator support 4 also have two sets of T-shaped needle roller bearings 10 (commercially available, see the actual picture) Figure 5), two sets of T-shaped needle roller bearings 10 are located on both sides of the stator core. Figure 6 As shown, the inner edge of the end cover 2 is mounted on the stator bracket 4 through two groups of T-shaped needle roller bearings 10. The T-shaped needle roller bearings 10 include an axial portion and a radial portion. The inner edge of the end cover 2 has a first groove 201, and the radial portion of the T-shaped needle roller bearing 10 is stuck in the first groove 201. The inner edge of the end cover 2, the T-shaped needle roller bearing 10 and the stator bracket 4 are surrounded by a second groove 12. The sealing ring 11 is installed in the second groove 12, and the sealing ring 11 adopts a lip-shaped sealing ring. It also includes a slot wedge 8 and a heat pipe 9, and the slot wedge 8 is aluminum nitride ceramic. One end of the heat pipe 9 is fixed in the slot wedge 8, and the other end of the heat pipe 9 passes through the stator bracket 4 along the radial direction of the motor and extends into the hollow part of the stator bracket 4. The stator bracket 4, the bearing, the end cover 2 and the housing 1 are surrounded by a closed cavity 2, and the cavity 1 constitutes a heat dissipation cavity.

[0032] As a preferred embodiment, the stator bracket 4 is an aluminum cylinder, and the inner wall of the aluminum cylinder also has a spoke 401, and the spoke 401 has a fixing seat 14, and the fixing seat 14 is used to install the motor on the main body of the device. The spoke 401 and the inner wall of the stator bracket 4 are connected to a second axial through hole 402, and the other end of the heat pipe 9 is bent and inserted into the second axial through hole 402 after passing through the stator bracket 4. The heat pipe 9 is a commercially available copper water heat pipe, which is pre-bent into a U shape. Before installing the heat pipe 9, a groove is pre-cut on the side of the stator bracket 4, one end of the heat pipe 9 is inserted into the slot wedge 8, the middle part of the heat pipe 9 is inserted into the side groove of the stator bracket 4, and the other end of the heat pipe 9 is inserted into the second axial through hole 402, and then the side groove is sealed with a sealant.

[0033] As another preferred embodiment, the stator teeth 5 are parallel teeth with dovetails 501, and the stator teeth 5 are detachably spliced ​​to the stator yoke 6. The coil 7 is a rectangular prefabricated TECO coil. During installation, the prefabricated TECO coil is first sleeved on the stator teeth 5, and the two ends of the rectangular coil are tightened with ceramic end rings 13, and then the stator teeth 5 are spliced ​​to the stator yoke 6. (This is the prior art, and specific references can be made to patents CN2023106245887, CN2023106245105 and CN2023106245675).

[0034] like Figure 7 and 8As shown, the slot wedge 8 includes a wedge tail 801, a strut head 802 and two lateral wedges 803. The lateral wedge 803 is located at the junction of the wedge tail 801 and the strut head 802, the lateral wedge 803 is clamped between the rectangular coil and the dovetail 501, the wedge tail 801 is clamped between adjacent rectangular coils, and the strut head 802 is clamped between the dovetails 501 of two adjacent stator teeth 5. The slot wedge 8 also has a first axial through hole 804, which is located between the two lateral wedges 803. One end of the heat pipe 9 is inserted into the first axial through hole 804.

[0035] Example 2

[0036] Fig. 9 and 10 Another fully enclosed outer rotor motor is shown, which is different from the first embodiment in that the heat pipe 9 is L-shaped, and the other end of the heat pipe 9 is not bent after passing through the stator bracket 4, and directly extends into the heat dissipation cavity of the stator bracket 4.

Claims

1. A fully enclosed outer rotor motor, comprising an outer rotor assembly and an inner stator assembly coaxially arranged, wherein the outer rotor assembly comprises a housing (1), an end cover (2) and a permanent magnet (3), and the inner stator assembly comprises a stator core and a stator bracket (4), characterized in that: The two ends of the casing (1) are fixed to the outer edge of the end cover (2), the stator core is fixed to the outer wall of the stator bracket (4), and the stator bracket (4) has a cavity 1, which is an open space; The stator support (4) also has two sets of bearings on its outer wall, the two sets of bearings are located on both sides of the stator core, the inner edge of the end cover (2) is mounted on the stator support (4) through the bearings, the stator support (4), the bearings, the end cover (2) and the casing (1) together form a second cavity, and the second cavity is a closed space; It also includes a fixing seat (14) and spokes (401), wherein the fixing seat (14) is fixed to the stator support (4) via the spokes (401); It also includes a heat-conducting component, one end of which is located in the second cavity, and the other end of which passes through the stator bracket (4) and extends into the first cavity.

2. The fully enclosed outer rotor motor according to claim 1, characterized in that: The stator support (4) is a hollow cylinder with openings at both ends, the interior of the hollow cylinder forms the cavity one, the fixing seat (14) and the spoke (401) are located in the cavity one, one end of the spoke (401) is connected to the inner wall of the stator support (4), and the other end of the spoke (401) is connected to the fixing seat (14).

3. The fully enclosed outer rotor motor according to claim 1, characterized in that: The stator bracket (4), the fixing seat (14) and the spokes (401) are integrally formed.

4. The fully enclosed outer rotor motor according to claim 1, characterized in that: The heat-conducting component is a heat pipe (9), and the other end of the heat pipe (9) passes through the stator bracket (4) in the radial direction.

5. The fully enclosed outer rotor motor according to claim 4, characterized in that: The stator core has a plurality of stator teeth (5) on its outer periphery, a stator yoke (6) on its inner periphery, coils (7) on the stator teeth (5), and slot wedges (8) which are clamped between adjacent coils (7), and one end of a heat pipe (9) is fixed in the slot wedge (8).

6. The fully enclosed outer rotor motor according to claim 5, characterized in that: The stator teeth (5) are parallel teeth with dovetail portions (501); the prefabricated TECO coil is a rectangular coil; the slot wedge (8) comprises a wedge-shaped tail portion (801), a strut head portion (802) and two lateral wedge-shaped portions (803); the lateral wedge-shaped portion (803) is located at the junction of the wedge-shaped tail portion (801) and the strut head portion (802); the lateral wedge-shaped portion (803) is clamped between the rectangular coil and the dovetail portion (501); the wedge-shaped tail portion (801) is clamped between adjacent coils (7); the strut head portion (802) is clamped between the dovetail portions (501) of two adjacent stator teeth (5); the slot wedge (8) also has a first axial through hole (804); the first axial through hole (804) is located between the two lateral wedge-shaped portions (803); and one end of the heat pipe (9) is fixed in the first axial through hole (804).

7. The fully enclosed outer rotor motor according to claim 4, characterized in that: The spoke (401) also has a second axial through hole (402), and the other end of the heat pipe (9) is bent and inserted into the second axial through hole (402) after passing through the stator bracket (4).

8. The fully enclosed outer rotor motor according to claim 1, characterized in that: The bearing is a T-shaped needle roller bearing (10), which comprises an axial portion and a radial portion. The inner edge of the end cover (2) has a first groove (201), and the radial portion of the T-shaped needle roller bearing (10) is clamped in the first groove (201).

9. The fully enclosed outer rotor motor according to claim 8, characterized in that: It also includes a sealing ring (11), the inner edge of the end cover (2), the T-shaped needle roller bearing (10) and the stator bracket (4) together form a second groove (12), and the sealing ring (11) is stuck in the second groove (12).

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