Three-phase shielding permanent magnet synchronous motor

Abstract

A three-phase shielding permanent magnet synchronous motor comprises a machine body, the machine body comprises a columnar machine shell and an installation disc at the front end of the machine shell, a rotating shaft is coaxially arranged in the machine shell, the front end and the rear end of the rotating shaft extend out of the installation disc and the rear end of the machine shell respectively, and the rear end is connected with a cooling fan; the cooling fan comprises a circular connecting disc coaxially connected with the rear end of the rotating shaft; a plurality of fan blades are circumferentially arranged on the plate surface of one side, far away from the shell, of the connecting disc; the cooling fan further comprises a cylindrical heat collection cylinder coaxially arranged on the outer ring of the machine shell in a sleeving mode, the outer ends of the fan blades extend out of the outer ring of the connecting disc and are connected with the inner ring of the rear end of the heat collection cylinder, a gap exists between the heat collection cylinder and the machine shell, spiral blades are arranged on the inner ring, and when the motor works, the cooling fan can be driven to rotate through the rotating shaft; the air flow can be driven to flow towards the rear end of the heat dissipation fan, so that heat generated by the shell outer ring can flow towards the tail end of the heat dissipation fan under the action of the flowing air flow and is finally blown out of the heat collection cylinder through the fan blades, and the overall heat dissipation and cooling effect of the shell outer ring is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a three-phase shielded permanent magnet synchronous motor. Background Technique

[0002] A three-phase shielded permanent magnet synchronous motor is a synchronous motor that uses a permanent magnet to excite a synchronous rotating magnetic field. At the same time, a special design is adopted to shield the electromagnetic waves generated by the motor to prevent them from leaking to the outside of the motor, thereby avoiding electromagnetic interference to other systems.

[0003] At present, most of the heat dissipation methods of motors are to install a cooling fan at the end of the rotating shaft to dissipate heat from the motor. For example, the application document with the application number CN202420042117.5 in the patent library discloses a heat dissipation type three-phase asynchronous motor, which fixedly connects a heat dissipation housing and a heat dissipation fan blade to one side of the housing through bolts, realizing that when the motor starts, the heat dissipation fan blade starts synchronously to complete the heat dissipation work of the motor. This method of arranging the heat dissipation fan blade at one end of the casing results in the overall outer ring of the casing being unable to achieve effective heat dissipation and cooling, ultimately resulting in a poor overall heat dissipation effect. Content of the Utility Model

[0004] To solve the technical problems existing in the above background technique, the utility model provides a three-phase shielded permanent magnet synchronous motor.

[0005] The technical solution of the utility model is as follows:

[0006] A three-phase shielded permanent magnet synchronous motor includes a fuselage. The fuselage includes a columnar casing and a mounting plate at the front end of the casing. The motor can be installed at the installation position through the mounting plate. A rotating shaft is coaxially arranged inside the casing. The front and rear ends of the rotating shaft respectively extend out of the mounting plate and the rear end of the casing. Among them, the front end of the rotating shaft is used for power output work, and a cooling fan is also connected to the rear end for heat dissipation work of the fuselage when the motor is working.

[0007] Regarding the structure of the cooling fan, it includes a circular connection disk coaxially connected to the rear end of the rotating shaft. On the surface of the connection disk away from the housing, several fan blades are circumferentially arranged. As the core technical concept of the present invention, the cooling fan further includes a cylindrical heat collecting cylinder coaxially sleeved on the outer circle of the housing. The outer ends of the fan blades extend beyond the outer circle of the connection disk and are connected to the inner circle of the rear end of the heat collecting cylinder. There is a gap between the heat collecting cylinder and the housing, and a spiral blade is arranged on the inner circle. And the spiral blade is arranged to drive the air flow to flow towards the rear end of the cooling fan when the heat collecting cylinder rotates. On the basis of the above structure, when the motor works, the cooling fan can be driven to rotate through the rotating shaft. The setting of the spiral blade enables the heat generated on the outer circle of the housing to flow towards the tail end of the cooling fan under the action of the flowing air flow, and is blown out of the heat collecting cylinder through the fan blades, realizing the overall heat dissipation and temperature reduction work of the outer circle of the housing, and significantly improving the heat dissipation and temperature reduction effect.

[0008] As described above, a three-phase shielded permanent magnet synchronous motor further includes a support member arranged on the outer circle of the front end of the housing. The inner circle of the front end of the heat collecting cylinder is rotationally matched with the support member to ensure that the heat collecting cylinder can stably rotate coaxially with the rotating shaft under the drive of the rotating shaft.

[0009] As a preferred embodiment, specifically regarding the structure of the support member, it includes a fixed ring sleeved on the outer circle of the housing. A plurality of support rods are circumferentially arranged on the outer circle of the fixed ring, and the outer ends of the support rods are provided with support wheels that are in rolling fit with the inner circle of the front end of the heat collecting cylinder. On the basis of this structure, an air suction channel for the air flow to pass through can be formed between the front end of the heat collecting cylinder and the housing, ensuring that when the hot air flow flows towards the tail end of the heat collecting cylinder under the action of the spiral blade, new cold air can flow into the heat collecting cylinder at the front end of the heat collecting cylinder, ensuring the fluidity of the air flow, and further ensuring the heat dissipation effect of the cooling fan.

[0010] To ensure the support effect of the support member on the heat collecting cylinder, at least 5 support rods are circumferentially arrayed around the fixed ring.

[0011] To prevent the rotation of the heat collecting cylinder from driving the support member to move and prevent the support member from losing its support effect, and ensure that it can have a stable and effective support effect on the heat collecting cylinder, a fixing bolt that can be tightened against the housing is further provided on the outer circle of the fixed ring.

[0012] To further ensure the fixing effect between the fixed ring and the housing, at least two fixing bolts are provided.

[0013] As a further preference, the heat collecting cylinder includes an air inlet section and a heat conduction section that are coaxially arranged front and back, and the outer diameter of the air inlet section is greater than the outer diameter of the heat conduction section. The spiral blade is arranged on the inner circle of the heat conduction section, and the support wheel is in rolling fit with the front end of the air inlet section, further ensuring the air permeability at the front end of the heat collecting cylinder, and thus improving the heat dissipation effect of the cooling fan under the action of the spiral blade.

[0014] A three-phase shielded permanent magnet synchronous motor as described above. To ensure that the rotation of the connection disk can smoothly drive the heat collecting cylinder to rotate through the fan blade and ensure the fixing effect between the heat collecting cylinder and the fan blade, a ring-shaped reinforcing ring plate is further provided at the rear end of the heat collecting cylinder. The outer ring thereof is fixed to the rear end of the heat collecting cylinder, and the inner side is fixed to the outer side of the fan blade.

[0015] To prevent the setting of the reinforcing ring plate from affecting the discharge of the hot air flow, the inner diameter of the reinforcing ring plate is larger than the outer diameter of the connection disk.

[0016] The beneficial effects of the present utility model are as follows: The present utility model is a three-phase shielded permanent magnet synchronous motor. When the motor works, the heat dissipation fan can be driven to rotate through the rotating shaft. With the setting of the spiral blade, when the heat collecting cylinder rotates, it can drive the air flow to flow towards the rear end of the heat dissipation fan. Eventually, the heat generated on the outer ring of the machine shell can flow towards the tail end of the heat dissipation fan under the action of the flowing air flow and be blown out of the heat collecting cylinder through the fan blade, realizing the overall heat dissipation and cooling work of the outer ring of the machine shell and significantly improving the heat dissipation and cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0018] In the drawings:

[0019] Figure 1 is a schematic structural diagram of the motor in the embodiment;

[0020] Figure 2 is a schematic structural diagram of the heat dissipation fan in the embodiment;

[0021] Figure 3 is a schematic cross-sectional structural diagram of the heat dissipation fan in the embodiment;

[0022] Figure 4 is a schematic structural diagram of the support member in the embodiment;

[0023] The components represented by the reference numerals in the drawings are:

[0024] 1, fuselage; 11, machine shell; 12, mounting plate; 13, rotating shaft; 14, junction box; 2, heat dissipation fan; 21, connection disk; 22, fan blade; 23, heat collecting cylinder; 231, heat conduction section; 232, air intake section; 24, spiral blade; 25, reinforcing ring plate; 3, support member; 31, fixing ring; 32, support rod; 33, support wheel; 34, fixing bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings.

[0026] Embodiment

[0027] This embodiment provides a three-phase shielded permanent magnet synchronous motor. Refer to Figure 1 , which includes a fuselage 1. The fuselage 1 includes a columnar casing 11 arranged horizontally and a mounting plate 12 provided at the front end of the casing 11. And through the mounting plate 12, the motor (the above-mentioned three-phase shielded permanent magnet synchronous motor) can be mounted at the position to be installed. On one side of the front end of the casing 11, a junction box 14 is provided, and a rotating shaft 13 is coaxially arranged inside. The front and rear ends of the rotating shaft 13 respectively extend out of the mounting plate 12 and the rear end of the casing 11. Among them, the front end of the rotating shaft 13 is used for power output work, and a cooling fan 2 is also connected to the rear end, which is used for the heat dissipation work of the fuselage 1 when the motor is working. The structure of the motor will be described in detail below.

[0028] In this embodiment, in combination with Figure 2 and Figure 3 , in terms of the structure of the cooling fan 2, it includes a circular connecting plate 21 coaxially connected to the rear end of the rotating shaft 13. An opening is provided in the middle of the connecting plate 21. The rear end of the rotating shaft 13 passes through the opening and is screwed with a fastening nut. Through the fastening nut, the connecting plate 21 is coaxially fixed to the rotating shaft 13. On the circumferential surface of the side of the connecting plate 21 away from the casing 11, a plurality of fan blades 22 are provided. The fan blades 22 are sheet-like structures, and the plane where they are located coincides with the rotating shaft 13 of the connecting plate 21.

[0029] As the core technical concept of the present utility model, the cooling fan 2 further includes a cylindrical heat collecting cylinder 23 coaxially sleeved on the outer circle of the casing 11. The outer ends (the ends away from the center of the connecting plate 21) of the fan blades 22 extend out of the outer circle of the connecting plate 21 and are connected to the inner circle of the rear end of the heat collecting cylinder 23. There is a gap between the heat collecting cylinder 23 and the casing 11, and a spiral blade 24 is provided on the inner circle. And the spiral blade 24 is arranged so that when the heat collecting cylinder 23 rotates, it can drive the air flow to flow towards the rear end of the cooling fan 2. On the basis of the above structure, when the motor works, the rotating shaft 13 can drive the cooling fan 2 to rotate. The setting of the spiral blade 24 enables the heat generated on the outer circle of the casing 11 to flow towards the tail end of the cooling fan 2 under the action of the flowing air flow, and is blown out of the heat collecting cylinder 23 through the fan blades 22, realizing the overall heat dissipation and temperature reduction work of the outer circle of the casing 11, and significantly improving the heat dissipation and temperature reduction effect.

[0030] As a preferred implementation manner, to improve the heat conduction effect under the action of the spiral blade 24, at least two groups of the spiral blades 24 are circumferentially arranged around the inner circle of the heat collecting cylinder 23.

[0031] Furthermore, to ensure that the rotation of the connecting disc 21 can smoothly drive the heat collecting cylinder 23 to rotate through the fan blades 22 and to ensure the fixing effect between the heat collecting cylinder 23 and the fan blades 22, a ring-shaped reinforcing ring plate 25 is further provided at the rear end of the heat collecting cylinder 23. The outer ring of the reinforcing ring plate 25 is fixed to the rear end of the heat collecting cylinder 23, and the inner side is fixed to the outer side of the fan blades 22.

[0032] To prevent the arrangement of the reinforcing ring plate 25 from affecting the discharge of the hot air flow, the inner diameter of the reinforcing ring plate 25 is larger than the outer diameter of the connecting disc 21.

[0033] In this embodiment, combined with Figure 4 , the motor further includes a support member 3 provided on the outer ring of the front end of the housing 11. The inner ring of the front end of the heat collecting cylinder 23 is rotationally matched with the support member 3 to ensure that the heat collecting cylinder 23 can stably rotate coaxially with the rotating shaft 13 under the drive of the rotating shaft 13.

[0034] As a preferred embodiment, specifically regarding the structure of the support member 3, it includes a fixing ring 31 sleeved on the outer ring of the housing 11. A plurality of support rods 32 are circumferentially arranged on the outer ring of the fixing ring 31, and a support wheel 33 that is in rolling fit with the inner ring of the front end of the heat collecting cylinder 23 is provided at the outer end of the support rod 32. On the basis of this structure, an air suction channel for the air flow to pass through can be formed between the front end of the heat collecting cylinder 23 and the housing 11, ensuring that when the hot air flow flows towards the rear end of the heat collecting cylinder 23 under the action of the spiral blades 24, new cold air can flow into the interior of the heat collecting cylinder 23 at the front end of the heat collecting cylinder 23, ensuring the fluidity of the air flow, and thus ensuring the heat dissipation effect of the cooling fan 2.

[0035] As a further preference, the heat collecting cylinder 23 includes an air inlet section 232 and a heat conducting section 231 that are coaxially arranged front and rear, and the outer diameter of the air inlet section 232 is larger than the outer diameter of the heat conducting section 231. The spiral blades 24 are arranged on the inner ring of the heat conducting section 231, and the support wheel 33 is in rolling fit with the front end of the air inlet section 232, further ensuring the air passing performance at the front end of the heat collecting cylinder 23, and thus improving the heat dissipation effect of the cooling fan 2 under the action of the spiral blades 24.

[0036] More preferably, to ensure the matching effect between the heat conducting section 231 and the air inlet section 232, and thus ensure the overall heat dissipation and cooling effect of the motor under the action of the cooling fan 2, the length of the heat conducting section 231 is set to be 1 / 6 - 1 / 4 of the length of the air inlet section 232.

[0037] In this embodiment, to ensure the supporting effect of the support member 3 on the heat collecting cylinder 23, at least 5 support rods 32 are circumferentially arranged around the fixing ring 31.

[0038] As a preferred embodiment, to prevent the rotation of the heat collecting cylinder 23 from driving the support member 3 to move, thereby preventing the support failure of the support member 3 and ensuring that it can have a stable and effective supporting effect on the heat collecting cylinder 23, a fixing bolt 34 capable of abutting against the casing 11 is further provided on the outer ring of the fixing ring 31.

[0039] As a further preference, to further ensure the fixing effect between the fixing ring 31 and the casing 11, at least two fixing bolts 34 are provided.

Claims

1. A three-phase shielded permanent magnet synchronous motor, comprising a body (1), the body (1) comprising a cylindrical housing (11) and a mounting plate (12) at its front end, a rotating shaft (13) being coaxially arranged inside the housing (11), front and rear ends of the rotating shaft (13) respectively extending out of the mounting plate (12) and the rear end of the housing (11), and a heat dissipation fan (2) being connected to the rear end of the rotating shaft (13), characterized in that: The heat dissipation fan (2) comprises a circular connection plate (21) coaxially connected to the rear end of the rotating shaft (13), and a plurality of fan blades (22) are circumferentially arranged on a plate surface of the connection plate (21) away from the housing (11); The heat dissipation fan (2) also includes a cylindrical heat collecting tube (23) coaxially sleeved on the outer ring of the housing (11), and the outer ends of the fan blades (22) extend out of the connection plate (21) and are connected to the rear end inner ring of the heat collecting tube (23); There is a gap between the heat collecting tube (23) and the casing (11), and spiral blades (24) are provided on the inner circle.

2. A three-phase shielded permanent magnet synchronous motor according to claim 1, characterized in that: It also includes a support member (3) arranged on the front outer ring of the casing (11), and the front inner ring of the heat collecting tube (23) is rotatably matched with the support member (3).

3. A three-phase shielded permanent magnet synchronous motor according to claim 2, characterized in that: The support member (3) comprises a fixing ring (31) sleeved on the outer ring of the casing (11), a plurality of supporting rods (32) are arranged circumferentially on the outer ring of the fixing ring (31), and the outer ends of the supporting rods (32) are provided with supporting wheels (33) which are rollingly matched with the inner ring of the front end of the heat collecting tube (23).

4. A three-phase shielded permanent magnet synchronous motor according to claim 3, characterized in that: The support rods (32) are arranged in a circular array at least 5 in number around the fixing ring (31).

5. A three-phase shielded permanent magnet synchronous motor according to claim 3, characterized in that: The outer ring of the fixing ring (31) is also provided with fixing bolts (34) capable of being tightly pressed against the casing (11).

6. A three-phase shielded permanent magnet synchronous motor according to claim 5, characterized in that: At least two fixing bolts (34) are provided.

7. A three-phase shielded permanent magnet synchronous motor according to claim 3, characterized in that: The heat collecting tube (23) comprises an air intake section (232) and a heat conduction section (231) which are coaxially arranged front and rear, and the outer diameter of the air intake section (232) is greater than the outer diameter of the heat conduction section (231); The spiral blade (24) is arranged on the inner ring of the heat conducting section (231), and the supporting wheel (33) is in rolling cooperation with the front end of the air inlet section (232).

8. The three-phase shielded permanent magnet synchronous motor according to claim 1, characterized in that: The rear end of the heat collecting tube (23) is also provided with an annular reinforcing ring plate (25), the outer ring of which is fixed to the rear end of the heat collecting tube (23), and the inner side of which is fixed to the outer side of the fan blade (22).

9. A three-phase shielded permanent magnet synchronous motor according to claim 8, characterized in that: The inner diameter of the reinforcing ring plate (25) is greater than the outer diameter of the connecting plate (21).

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