A motor for an industrial sewing machine

Abstract

The invention relates to a motor of an industrial sewing machine, wherein a stator and rotor assembly wound with aluminum wire is arranged in a front shell, which effectively reduces manufacturing costs; a rear cover is provided at the opening of the front shell, and one end of a rotating shaft extends from the rear cover and is connected to a fan blade; a control circuit board is provided in the rear shell, and a front cover is provided at the opening of the rear shell; an air inlet is provided at the side end of the rear shell, a front air guide hole is provided in the middle of the front cover, and a rear air guide hole is provided in the rear cover. After the rear shell is closed on the front shell, an air outlet gap is formed at the edge of the opening and a heat dissipation cavity for accommodating the fan blades is formed between the front cover and the rear cover, the front air guide hole and the rear air guide hole are respectively communicated with the heat dissipation cavity, and the air outlet gap is communicated with the heat dissipation cavity; the rotating shaft drives the fan blades to rotate so that wind enters the rear shell from the air inlet and brings the heat of the control circuit board into the heat dissipation cavity through the front air guide hole, while the heat of the stator and rotor assemblies is brought into the heat dissipation cavity through the rear air guide hole, and the wind in the heat dissipation cavity is discharged from the air outlet gap, thereby realizing true convection heat dissipation.

Description

Technical field

[0002] The invention relates to the technical field of motors, in particular to a motor for an industrial sewing machine. [Background Technology]

[0004] In the prior art, the stator assembly of the motor of an industrial sewing machine is wound with copper wire. Due to the continuous rise in the price of copper in recent years, the manufacturing cost has continued to increase, and product upgrading and transformation is imminent, otherwise it will lose market competitiveness.

[0005] Some motor manufacturers have begun researching and developing alternative materials to copper. However, replacing copper with other materials significantly increases motor temperature. Existing motor heat dissipation structures lack true convection cooling and therefore cannot meet heat dissipation requirements. If copper is replaced with aluminum, the motor's operating temperature will reach 90°C, failing to meet national standards. Therefore, developing new heat dissipation structures is an urgent issue. [Summary of the invention]

[0007] In order to solve the above problems, the present invention provides a motor for an industrial sewing machine, which has the advantages of low production cost and good heat dissipation effect.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A motor for an industrial sewing machine includes a front housing 1 that can be mounted on a sewing machine bracket 100 and a rear housing 2 that covers the front housing 1. The front housing 1 is provided with a drive chamber 10 that opens toward the rear housing 2. A stator and rotor assembly 3 wound with aluminum wire is disposed within the drive chamber 10. The stator and rotor assembly 3 includes a rotating shaft 31. A rear cover 4 is provided at the opening of the front housing 1. One end of the rotating shaft 31 extends from the rear cover 4 and is connected to a fan blade 5. The other end of the rotating shaft 31 extends from the front end of the front housing 1 and is connected to a pulley 6. The rear housing 2 is provided with a control chamber 20 that opens toward the front housing 1. A control circuit board 7 is disposed within the control chamber 20. A front cover 8 is provided at the opening of the rear housing 2.

[0010] As a preferred embodiment, it is further defined as: an air inlet 21 is provided at the side end of the rear shell 2, a front air guide hole 80 communicating with the air inlet 21 is provided in the middle of the front cover 8, and the rear cover 4 is provided with a plurality of rear air guide holes 40 arranged around the rotating shaft 31. The opening of the rear shell 2 is larger than the opening of the front shell 1. After the rear shell 2 is covered with the front shell 1, an air outlet gap 23 is formed at the edge of the opening and a heat dissipation cavity 22 for accommodating the fan blades 5 is formed between the front cover 8 and the rear cover 4. The front air guide hole 80 and the rear air guide hole 40 are respectively communicated with the heat dissipation cavity 22, and the air outlet gap 23 is communicated with the heat dissipation cavity 22.

[0011] As a preferred embodiment, it is further defined as: a heat sink 9 is also provided in the control chamber 20, the control circuit board 7 is fixed on one side of the heat sink 9, the front cover 8 is fixed on the other side of the heat sink 9 and an air inlet channel 24 is formed between the front cover 8 and the heat sink 9, the air inlet 21 is provided between the front cover 8 and the heat sink 9, and the air inlet channel 24 connects the air inlet 21 with the front air guide hole 80.

[0012] As a preferred embodiment, it is further defined as: the back cover 4 is concave in an arc-shaped back cover cavity 41, the fan blade 5 includes an assembly portion 51 fixedly connected to the rotating shaft 31 and blades 52 distributed in an array around the assembly portion 51, a heat dissipation gap 50 is formed between the two blades 52, and the front side of one end of the blade 52 away from the assembly portion 51 is provided with an arc chamfer 53 adapted to the curvature of the back cover cavity 41.

[0013] As a preferred embodiment, it is further defined as: the rear cover 4 has a shaft hole 42 for the shaft 31 to pass through, the rear cover 4 has a bearing fixing portion 43 located at the edge of the shaft hole 42 and extending forward, and the bearing fixing portion 43 is provided with a first bearing 32 movably connected to the shaft 31; the rear air guide hole 40 is provided on the cavity wall of the rear cover cavity 41 and is arranged around the bearing fixing portion 43.

[0014] As a preferred embodiment, it is further defined as follows: the fan blade 5 also includes a connecting portion 54 connecting the ends of several blades 52 together; and a plurality of teeth 55 are provided in the middle of the rear side of the fan blade 5.

[0015] As a preferred embodiment, it is further defined as follows: a card hole 90 is provided on the heat dissipation plate 9, and the front cover 8 is provided with a plurality of protruding arms 81 facing the heat dissipation plate 9, and a card block 82 is provided on the protruding arm 81 to be snap-connected with the card hole 90.

[0016] As a preferred embodiment, it is further defined as: a first mounting portion 44 is protruding outward on the circumferential surface of the rear cover 4, a second mounting portion 12 adapted to the first mounting portion 44 is provided on the circumferential surface of the front shell 1, and the first mounting portion 44 and the second mounting portion 12 are connected by a first screw thread 13.

[0017] As a preferred embodiment, it is further defined as follows: a threaded hole 45 is further provided on the circumferential surface of the rear cover 4 , and the rear housing 2 is screwed to the rear cover 4 via a second screw 14 .

[0018] As a preferred embodiment, it is further defined as follows: the front end of the front housing 1 is equipped with a second bearing 33 movably connected to the rotating shaft 31 .

[0019] As a preferred embodiment, it is further defined as follows: a plurality of heat dissipation ribs 11 distributed in an array are provided on the outer side of the front housing 1 .

[0020] The beneficial effects of the present invention are:

[0021] 1. The front housing of the invention is equipped with stator and rotor assemblies wound with aluminum wire, which effectively reduces manufacturing costs;

[0022] 2. A rear cover is provided at the opening of the front shell, and one end of the rotating shaft extends from the rear cover and is connected to the fan blades; a control circuit board is provided in the rear shell, and a front cover is provided at the opening of the rear shell; an air inlet is provided at the side end of the rear shell, a front air guide hole is provided in the middle of the front cover, and a rear air guide hole is provided at the rear cover. After the rear shell is closed on the front shell, an air outlet gap is formed at the edge of the opening and a heat dissipation cavity for accommodating the fan blades is formed between the front cover and the rear cover, the front air guide hole and the rear air guide hole are respectively communicated with the heat dissipation cavity, and the air outlet gap is communicated with the heat dissipation cavity; the rotating shaft drives the fan blades to rotate so that wind enters the rear shell from the air inlet and brings the heat of the control circuit board into the heat dissipation cavity through the front air guide hole, and the heat of the stator and rotor components is brought into the heat dissipation cavity from the rear air guide hole, and the wind in the heat dissipation cavity is discharged from the air outlet gap, thereby realizing true convection heat dissipation.

Brief Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the structural decomposition of the present invention;

[0026] Figure 3 It is a cross-sectional view of the transverse structure of the present invention;

[0027] Figure 4 It is a longitudinal structural cross-sectional view of the invention;

[0028] Figure 5 It is a schematic diagram of wind flow direction;

[0029] Figure 6 This is one of the structural diagrams of the back cover;

[0030] Figure 7 This is the second structural diagram of the back cover;

[0031] Figure 8 This is one of the structural diagrams of the fan blade;

[0032] Figure 9 This is the second diagram of the fan blade structure;

[0033] Figure 10 It is a structural diagram of the front cover;

[0034] Figure 11 It is a structural diagram of the heat sink. [Specific implementation method]

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] As attached Figure 1 To the attached Figure 11 As shown, a motor for an industrial sewing machine includes a front housing 1 that can be mounted on a sewing machine bracket 100 and a rear housing 2 that covers the front housing 1. The front housing 1 is made of die-cast aluminum, which has significantly improved concentricity compared to the conventional stretched aluminum process. The front housing 1 is provided with a drive chamber 10 that opens toward the rear housing 2. The drive chamber 10 contains a stator and rotor assembly 3. The stator and rotor assembly 3 includes a stator, a rotor, and a rotating shaft 31. The stator is wound with aluminum wire. Compared to copper wire, aluminum wire is cheaper, reducing the cost of each motor by at least 10 yuan, which can provide a significant market price competitive advantage. A rear cover 4 is provided at the opening of the front housing 1. One end of the rotating shaft 31 extends from the rear cover 4 and is connected to a fan blade 5. The other end of the rotating shaft 31 extends from the front end of the front housing 1 and is connected to a pulley 6. The front housing 1 is also provided with a flywheel protective cover 60. The rear housing 2 is provided with a control cavity 20 opening toward the front housing 1 , a control circuit board 7 is provided in the control cavity 20 , and a front cover 8 is provided at the opening of the rear housing 2 ;

[0038] An air inlet 21 is provided at the side end of the rear shell 2, and a front air guide hole 80 communicating with the air inlet 21 is provided in the middle of the front cover 8. The rear cover 4 is provided with a plurality of rear air guide holes 40 arranged around the rotating shaft 31. The opening of the rear shell 2 is larger than the opening of the front shell 1. After the rear shell 2 is covered with the front shell 1, an air outlet gap 23 is formed at the edge of the opening and a heat dissipation cavity 22 for accommodating the fan blades 5 is formed between the front cover 8 and the rear cover 4. The front air guide hole 80 and the rear air guide hole 40 are respectively communicated with the heat dissipation cavity 22, and the air outlet gap 23 is communicated with the heat dissipation cavity 22.

[0039] Furthermore, a heat sink 9 is provided within the control chamber 20. The control circuit board 7 is fixed to one side of the heat sink 9. The front cover 8 is fixed to the other side of the heat sink 9, and an air inlet channel 24 is formed between the front cover 8 and the heat sink 9. The air inlet 21 is provided between the front cover 8 and the heat sink 9. The air inlet channel 24 connects the air inlet 21 with the front air duct 80. The rotating shaft 31 drives the fan blades 5 to rotate, allowing air to enter the rear housing 2 through the air inlet 21 and carry the heat from the control circuit board 7 into the heat sink through the front air duct 80. In this embodiment, because the heat sink 9 is provided, the heat from the control circuit board 7 is first transferred to the heat sink 9 and then carried away by the wind. The heat from the stator and rotor assemblies 3 is carried into the heat sink 22 through the rear air duct 40. The air in the heat sink 22 is discharged through the air outlet gap 23, achieving true convection heat dissipation.

[0040] In this embodiment, as shown in the attached Figure 6 and attached Figure 7 As shown, the back cover 4 has an arc-shaped back cover cavity 41, as shown in the attached Figure 8 and attached Figure 9 As shown, the fan blade 5 includes a mounting portion 51 fixedly connected to the rotating shaft 31 and blades 52 arranged in an array around the mounting portion 51. In this embodiment, the number of blades 52 is 12, and the number of rear air guide holes 40 is also 12. A heat dissipation gap 50 is formed between the two blades 52. The front end of each blade 52, away from the mounting portion 51, is provided with a curved chamfer 53 that matches the curvature of the rear cover cavity 41. The use of the curved chamfer design, in conjunction with the curved rear cover cavity 41, can better transfer heat from the drive cavity 10 to the heat dissipation cavity 22.

[0041] In this embodiment, as shown in the attached Figure 7 As shown, the rear cover 4 has a shaft hole 42 for the shaft 31 to pass through, and the rear cover 4 has a bearing fixing portion 43 located at the edge of the shaft hole 42 and extending forward. The bearing fixing portion 43 is provided with a first bearing 32 movably connected to the shaft 31. The structure is simple and the design is ingenious. The first bearing 32 makes the rotation of the shaft 31 more stable and smooth. The rear air guide hole 40 is provided on the cavity wall of the rear cover cavity 41 and is arranged around the bearing fixing portion 43, with a reasonable spatial distribution. In this embodiment, the fan blade 5 also includes a connecting portion 54 that connects the ends of several blades 52 together to increase the structural strength so that the heat dissipation gap 50 between the blades 52 maintains a fixed spacing; a plurality of teeth 55 are provided in the middle of the rear side of the fan blade 5, and the teeth 55 can disturb the flow, thereby reducing noise.

[0042] In this embodiment, as shown in the attached Figure 11As shown, the heat sink 9 is provided with a locking hole 90, and the front cover 8 is provided with a plurality of protruding arms 81 facing the heat sink 9. The protruding arms 81 are provided with a clamping block 82 that is snap-connected to the locking hole 90. The clamping block 82 is snapped into the locking hole 90 for assembly. The length of the protruding arms 81 is also the width of the air inlet channel 24. The length of the protruding arms 81 forms the air inlet channel 24 between the front cover 8 and the heat sink 9.

[0043] In this embodiment, a first mounting portion 44 is protruding outward from the circumference of the rear cover 4. A second mounting portion 12 is provided on the circumference of the front housing 1, which is compatible with the first mounting portion 44. The first mounting portion 44 and the second mounting portion 12 are connected by a first screw 13, resulting in a simple structure, easy assembly, and secure installation. The circumference of the rear cover 4 is also provided with a threaded hole 45, and the rear housing 2 is screwed to the rear cover 4 via a second screw 14, resulting in a simple structure, easy assembly, and secure installation. A second bearing 33 is mounted at the front end of the front housing 1, which is movably connected to the rotating shaft 31. The second bearing 33 ensures smooth and stable rotation of the rotating shaft 31.

[0044] In this embodiment, the outer side of the front housing 1 is provided with a plurality of heat dissipation ribs 11 arranged in an array. These ribs 11 effectively absorb a portion of the heat within the drive cavity 10. Airflow removed through the air outlet gaps 23 flows through the ribs 11, dissipating heat from the ribs 11 and the outer surface of the front housing 1, further improving heat dissipation efficiency. This heat dissipation structure represents a revolutionary change, reducing the motor's operating temperature from 90°C to 50°C, meeting national standards and significantly addressing industry challenges, achieving true convection cooling.

Claims

1. A motor for an industrial sewing machine, characterized in that: The invention comprises a front housing (1) capable of being mounted on a sewing machine bracket (100) and a rear housing (2) covering the front housing (1), wherein the front housing (1) is provided with a driving chamber (10) opening toward the rear housing (2), wherein a stator and rotor assembly (3) wound with aluminum wire is provided in the driving chamber (10), wherein the stator and rotor assembly (3) comprises a rotating shaft (31), a rear cover (4) is provided at the opening of the front housing (1), one end of the rotating shaft (31) extends from the rear cover (4) and is connected to a fan blade (5), and the other end of the rotating shaft (31) extends from the front end of the front housing (1) and is connected to a pulley (6); the rear housing (2) is provided with a control chamber (20) opening toward the front housing (1), wherein a control circuit board (7) is provided in the control chamber (20), and a front cover (8) is provided at the opening of the rear housing (2); An air inlet (21) is provided at the side end of the rear shell (2), a front air guide hole (80) communicating with the air inlet (21) is provided in the middle of the front cover (8), and a plurality of rear air guide holes (40) arranged around the rotating shaft (31) are provided on the rear cover (4). The opening of the rear shell (2) is larger than the opening of the front shell (1), and an air outlet gap (23) is formed at the edge of the opening after the rear shell (2) covers the front shell (1), and a heat dissipation cavity (22) for accommodating the fan blade (5) is formed between the front cover (8) and the rear cover (4), the front air guide hole (80) and the rear air guide hole (40) are respectively communicated with the heat dissipation cavity (22), and the air outlet gap (23) is communicated with the heat dissipation cavity (22); a heat dissipation cavity (20) is also provided in the control cavity (20). The control circuit board (7) is fixed on one side of the heat dissipation plate (9), the front cover (8) is fixed on the other side of the heat dissipation plate (9) and an air inlet channel (24) is formed between the front cover (8) and the heat dissipation plate (9), the air inlet (21) is arranged between the front cover (8) and the heat dissipation plate (9), and the air inlet channel (24) connects the air inlet (21) with the front air guide hole (80); the rotating shaft (31) drives the fan blade (5) to rotate so that the wind enters the rear shell (2) from the air inlet (21) and brings the heat of the control circuit board (7) into the heat dissipation cavity through the front air guide hole (80), and the heat of the stator and rotor assembly (3) is brought into the heat dissipation cavity (22) through the rear air guide hole (40), and the wind in the heat dissipation cavity (22) is discharged from the air outlet gap (23) for convection heat dissipation.

2. The motor for an industrial sewing machine according to claim 1, characterized in that: The back cover (4) is concave in an arc-shaped back cover cavity (41), and the fan blade (5) includes an assembly portion (51) fixedly connected to the rotating shaft (31) and blades (52) distributed in an array around the assembly portion (51), a heat dissipation gap (50) is formed between the two blades (52), and an arc chamfer (53) is provided on the front side of one end of the blade (52) away from the assembly portion (51) and adapted to the curvature of the back cover cavity (41).

3. The motor for an industrial sewing machine according to claim 2, characterized in that: The rear cover (4) has a shaft hole (42) for the shaft (31) to pass through, and the rear cover (4) has a bearing fixing portion (43) located at the edge of the shaft hole (42) and extending forward, and a first bearing (32) movably connected to the shaft (31) is provided in the bearing fixing portion (43); the rear air guide hole (40) is provided on the cavity wall of the rear cover cavity (41) and is arranged around the bearing fixing portion (43).

4. The motor for an industrial sewing machine according to claim 3, characterized in that: The fan blade (5) further comprises a connecting portion (54) connecting the ends of the plurality of blades (52) together; and a plurality of teeth (55) are provided at the middle portion of the rear side of the fan blade (5).

5. The motor for an industrial sewing machine according to claim 4, characterized in that: The heat dissipation plate (9) is provided with a clamping hole (90), the front cover (8) is provided with a plurality of protruding arms (81) facing the heat dissipation plate (9), and the protruding arms (81) are provided with clamping blocks (82) that are buckled and connected to the clamping hole (90).

6. The motor for an industrial sewing machine according to any one of claims 1 to 5, characterized in that: A first mounting portion (44) is provided on the circumferential surface of the rear cover (4) and protrudes outwards. A second mounting portion (12) adapted to the first mounting portion (44) is provided on the circumferential surface of the front shell (1). The first mounting portion (44) and the second mounting portion (12) are connected via a first screw thread (13).

7. The motor for an industrial sewing machine according to claim 6, characterized in that: A threaded hole (45) is also provided on the circumferential surface of the rear cover (4), and the rear housing (2) is screw-connected to the rear cover (4) via a second screw (14).

8. The motor for an industrial sewing machine according to any one of claims 1 to 5, characterized in that: The front end of the front housing (1) is equipped with a second bearing (33) movably connected to the rotating shaft (31).

9. The motor for an industrial sewing machine according to any one of claims 1 to 5, characterized in that: The outer side of the front housing (1) is provided with a plurality of heat dissipation ribs (11) distributed in an array.

Images