A permanent magnet synchronous motor with overheat protection function

Abstract

The present invention relates to the technical field of permanent magnet synchronous motors, and in particular to a permanent magnet synchronous motor with an overheat protection function, which includes a permanent magnet motor body and a protective housing. The protective housing is located outside the permanent magnet motor body and is fixedly connected to the permanent magnet motor body. A connecting plate is provided on the left side of the protective housing, a connecting seat is fixedly connected to the right side of the connecting plate, and a cylinder body is fixedly connected to the inner wall of the connecting seat. The present invention has the advantages of being convenient for installation and maintenance and being able to increase the heat dissipation effect of the permanent magnet synchronous motor. It can not only protect the permanent magnet synchronous motor and prevent external objects from colliding with the permanent magnet synchronous motor, but also effectively improve the ventilation and heat dissipation efficiency, thereby ensuring the long-term stable operation of the permanent magnet synchronous motor. It solves the problem that the existing permanent magnet synchronous motor does not have an overheat protection function during use, and the surface temperature of the permanent magnet synchronous motor is too high after long-term operation, and it is easy to be dangerous if the operator accidentally touches it at this time.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and particularly to a permanent magnet synchronous motor with an overheat protection function. Background Technique

[0002] The permanent magnet synchronous motor uses permanent magnets to provide excitation, making the motor structure relatively simple, reducing processing and assembly costs, and eliminating the slip rings and brushes that are prone to problems, improving the reliability of the motor operation; and because there is no need for excitation current and no excitation loss, the efficiency and power density of the motor are improved. The permanent magnet synchronous motor is composed of components such as a stator, a rotor, and an end cover. The stator is basically the same as that of an ordinary induction motor, and a laminated structure is used to reduce the iron loss during motor operation. The rotor can be made solid or laminated. The armature winding can use a concentrated full-pitch winding, or a distributed short-pitch winding and an unconventional winding.

[0003] The existing permanent magnet synchronous motors do not have the function of overheat protection when in use. After the permanent magnet synchronous motor works for a long time, the surface temperature is too high. At this time, if the operator accidentally touches it, it is easy to be dangerous. Therefore, it is not convenient for users to use. For this reason, we propose a permanent magnet synchronous motor with an overheat protection function to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a permanent magnet synchronous motor with an overheat protection function, which has the advantages of being convenient for installation and maintenance and being able to increase the heat dissipation effect of the permanent magnet synchronous motor, and solves the problem that the existing permanent magnet synchronous motors do not have the function of overheat protection when in use. After the permanent magnet synchronous motor works for a long time, the surface temperature is too high. At this time, if the operator accidentally touches it, it is easy to be dangerous.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A permanent magnet synchronous motor with an overheat protection function, including a permanent magnet motor body and a protective housing. The protective housing is located outside the permanent magnet motor body and is fixedly connected to the permanent magnet motor body. A connecting plate is provided on the left side of the protective housing. The right side of the connecting plate is fixedly connected to a connecting seat. The inner wall of the connecting seat is fixedly connected with a cylinder body, and the cylinder bodies are distributed in a ring shape. The opposite ends of the cylinder bodies are fixedly connected to an installation box. A heat dissipation fan is provided in the inner cavity of the connecting seat and on the right side of the cylinder body. A reset mechanism is provided inside the heat dissipation fan. A positioning block adapted to the reset mechanism is embedded on the outside of the connecting seat. An adjusting mechanism is provided inside the installation box. Ventilation holes are opened on the outside of the protective housing, and the ventilation holes are communicated with the inner cavity of the protective housing. A temperature sensor is embedded on the inner wall of the protective housing, and the temperature sensor penetrates to the outside of the protective housing.

[0006] Preferably, a fixing plate is fixedly connected to the right side of the permanent magnet motor body. A sealing ring is fixedly connected to the middle position of the fixing plate. The sealing ring is rotationally connected to the output shaft of the permanent magnet motor body. A plurality of fixing holes distributed in a ring shape are formed on the surface of the fixing plate.

[0007] Preferably, the reset mechanism includes a movable rod, a first limit block, a second limit block and a compression spring. The movable rod is located in the inner cavity of the cylinder body. One end of the movable rod penetrates into the inner cavity of the installation box and is slidably connected to the installation box. The first limit block is fixedly connected to the inner wall of the cylinder body. The second limit block is fixedly connected to the surface of the movable rod, and the second limit block is located on the side of the first limit block away from the positioning block. The compression spring is sleeved on the outside of the movable rod, and both ends of the compression spring are fixedly connected to the first limit block and the second limit block respectively.

[0008] Preferably, the adjusting mechanism includes a disc, a manual knob and a clamping block. The disc is located in the inner cavity of the installation box and is rotationally connected to the inner wall of the installation box. The manual knob is fixedly connected to the left side of the disc. The clamping block is fixedly connected to the outer wall of the disc, and the clamping blocks are distributed around the disc. One end of the movable rod penetrating into the installation box is clamped with the clamping block.

[0009] Preferably, a protective net is fixedly connected to the inner wall of the connecting seat, and the protective net is located between the installation box and the cooling fan.

[0010] Preferably, a plurality of first positioning grooves are formed on the outside of the connecting seat. The positioning block is located inside the first positioning groove and is slidably connected to the inner wall of the first positioning groove. One end of the movable rod penetrates into the first positioning groove and is fixedly connected to the positioning block.

[0011] Preferably, a plurality of second positioning grooves are formed on the left side inside the protective housing, and the second positioning grooves are distributed in a ring shape. The position of the positioning block corresponds to the second positioning groove and is slidably connected to the inner wall of the second positioning groove.

[0012] Preferably, a through hole is formed in the middle position of the connecting plate. The manual knob is located inside the through hole, and the manual knob extends to the left side of the connecting plate.

[0013] Preferably, the diameter of the connecting seat is smaller than the inner diameter of the protective housing, and the connecting seat is slidably connected to the inner wall of the protective housing.

[0014] Preferably, the number of the ventilation holes is several, and the ventilation holes are arranged in a ring shape. A dust-proof net is arranged inside the ventilation holes.

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

[0016] By providing a protective housing, a connecting plate, a connecting seat, a cooling fan, a reset mechanism, a positioning block, an adjustment mechanism, ventilation holes, and a temperature sensor, the present invention has the advantages of being easy to install and maintain and increasing the heat dissipation effect of the permanent magnet synchronous motor. It can not only protect the permanent magnet synchronous motor from being collided by external objects, but also effectively improve the ventilation and heat dissipation efficiency, thereby ensuring the long-term stable operation of the permanent magnet synchronous motor. This solves the problem that the existing permanent magnet synchronous motor does not have an overheat protection function, and the surface temperature of the permanent magnet synchronous motor becomes too high after long-term operation, which may cause danger if the operator accidentally touches it, and thus improves the safety performance of the permanent magnet synchronous motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic sectional view of the structure of the present invention;

[0018] Figure 2 is a schematic three-dimensional view of the structure of the present invention;

[0019] Figure 3 is a left-sectional view of a partial structure of the present invention;

[0020] Figure 4 For the present invention Figure 3 is a partially enlarged view of part A in;

[0021] Figure 5 For the present invention Figure 3 is a partially enlarged view of part B in;

[0022] Figure 6 is a schematic three-dimensional view of the protective cover structure of the present invention.

[0023] In the figure: 1, permanent magnet motor body; 2, protective housing; 3, connecting plate; 4, connecting seat; 5, cylinder; 6, mounting box; 7, cooling fan; 8, reset mechanism; 81, movable rod; 82, first limit block; 83, second limit block; 84, compression spring; 9, positioning block; 10, adjustment mechanism; 101, disc; 102, manual knob; 103, clamping block; 11, ventilation holes; 12, temperature sensor; 13, fixing plate; 14, sealing ring; 15, fixing holes; 16, protective net; 17, first positioning groove; 18, second positioning groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figures 1-6 , a permanent magnet synchronous motor with overheat protection function, including a permanent magnet motor body 1 and a protective shell 2. The protective shell 2 is located outside the permanent magnet motor body 1 and fixedly connected to the permanent magnet motor body 1. A connecting plate 3 is arranged on the left side of the protective shell 2. A connecting seat 4 is fixedly connected to the right side of the connecting plate 3. The diameter of the connecting seat 4 is smaller than the inner diameter of the protective shell 2, and the connecting seat 4 is slidably connected to the inner wall of the protective shell 2. A cylinder 5 is fixedly connected to the inner wall of the connecting seat 4, and the cylinder 5 is distributed in a ring shape. An installation box 6 is fixedly connected to one end of the cylinder 5 facing each other. A heat dissipation fan 7 is arranged in the inner cavity of the connecting seat 4 and on the right side of the cylinder 5. A reset mechanism 8 is arranged inside the heat dissipation fan 7. A positioning block 9 adapted to the reset mechanism 8 is embedded on the outside of the connecting seat 4. An adjusting mechanism 10 is arranged inside the installation box 6. Ventilation holes 11 are opened on the outside of the protective shell 2, and the ventilation holes 11 are communicated with the inner cavity of the protective shell 2. The number of the ventilation holes 11 is several, and the ventilation holes 11 are arranged in a ring. A dust-proof net is arranged inside the ventilation holes 11. A temperature sensor 12 is embedded on the inner wall of the protective shell 2, and the temperature sensor 12 penetrates to the outside of the protective shell 2.

[0026] In this embodiment, a fixing plate 13 is fixedly connected to the right side of the permanent magnet motor body 1. A sealing ring 14 is fixedly connected to the middle position of the fixing plate 13. The sealing ring 14 is rotatably connected to the output shaft of the permanent magnet motor body 1. A plurality of fixing holes 15 distributed in a ring are opened on the surface of the fixing plate 13. Through the settings of the fixing plate 13, the sealing ring 14 and the fixing holes 15, it is convenient for the installation and fixation of the permanent magnet synchronous motor and can prevent moisture from seeping into the permanent magnet synchronous motor.

[0027] In this embodiment, the reset mechanism 8 includes a movable rod 81, a first limit block 82, a second limit block 83 and a compression spring 84. The movable rod 81 is located in the inner cavity of the cylinder 5. One end of the movable rod 81 penetrates into the inner cavity of the installation box 6 and is slidably connected to the installation box 6. The first limit block 82 is fixedly connected to the inner wall of the cylinder 5. The second limit block 83 is fixedly connected to the surface of the movable rod 81, and the second limit block 83 is located on the side of the first limit block 82 away from the positioning block 9. The compression spring 84 is sleeved on the outside of the movable rod 81, and both ends of the compression spring 84 are fixedly connected to the first limit block 82 and the second limit block 83 respectively. Through the settings of the movable rod 81, the first limit block 82, the second limit block 83 and the compression spring 84, a reset function can be achieved, enabling the movable rod 81 to move towards the inside of the installation box 6, which is beneficial for the movable rod 81 to drive the positioning block 9 to separate from the protective shell 2.

[0028] In this embodiment, the adjusting mechanism 10 includes a disc 101, a manual knob 102, and a clamping block 103. The disc 101 is located inside the mounting box 6 and is rotatably connected to the inner wall of the mounting box 6. The manual knob 102 is fixedly connected to the left side of the disc 101. The clamping block 103 is fixedly connected to the outer wall of the disc 101, and the clamping blocks 103 are distributed around the disc 101. One end of the movable rod 81 that penetrates into the mounting box 6 is clamped with the clamping block 103. Through the arrangement of the disc 101, the manual knob 102, and the clamping block 103, the movable rod 81 can be pushed to move outside the mounting box 6, so that the positioning block 9 can be clamped with the protective housing 2, and the connection and fixation of the connecting plate 3 can be completed.

[0029] In this embodiment, a protective net 16 is fixedly connected to the inner wall of the connecting seat 4, and the protective net 16 is located between the mounting box 6 and the cooling fan 7. Through the arrangement of the protective net 16, a protective effect can be achieved, and foreign objects can be prevented from entering the inside of the protective housing 2 and damaging the cooling fan 7.

[0030] In this embodiment, a plurality of first positioning grooves 17 are formed on the outer side of the connecting seat 4. The positioning block 9 is located inside the first positioning grooves 17 and is slidably connected to the inner walls of the first positioning grooves 17. One end of the movable rod 81 penetrates into the first positioning grooves 17 and is fixedly connected to the positioning block 9. Through the arrangement of the first positioning grooves 17, it is convenient for the positioning block 9 to move into the first positioning grooves 17, which is beneficial to separating the connecting seat 4 from the protective housing 2.

[0031] In this embodiment, a plurality of second positioning grooves 18 are formed on the left side inside the protective housing 2, and the second positioning grooves 18 are annularly distributed. The position of the positioning block 9 corresponds to that of the second positioning grooves 18 and is slidably connected to the inner walls of the second positioning grooves 18. Through the arrangement of the second positioning grooves 18, the positioning block 9 can enter the second positioning grooves 18, and the connection between the connecting seat 4 and the protective housing 2 can be completed.

[0032] In this embodiment, a through hole is formed in the middle of the connecting plate 3. The manual knob 102 is located inside the through hole, and the manual knob 102 extends to the left side of the connecting plate 3. Through the arrangement of the through hole and the manual knob 102, it is convenient for the staff to rotate the manual knob 102, which is beneficial to the installation and disassembly of the connecting plate 3.

[0033] Working principle: When in use, first fix the permanent magnet synchronous motor in the working area through the fixing hole 15. During the operation of the permanent magnet synchronous motor, heat will be generated. At this time, turn on the cooling fan 7, and the cooling fan 7 works to discharge the hot air inside the protective shell 2. Subsequently, the air outside the protective shell 2 enters the inner cavity of the protective shell 2 through the ventilation holes 11, so as to increase the air circulation rate inside the protective shell 2 and cool down the permanent magnet synchronous motor. The temperature sensor 12 can detect the heat of the permanent magnet synchronous motor. When the temperature reaches the warning value, the temperature sensor 12 feeds back the information to the operation center, causing the permanent magnet synchronous motor to stop working to avoid overheating and damage of the permanent magnet synchronous motor. When maintenance of the permanent magnet synchronous motor is required, rotate the manual knob 102. The manual knob 102 drives the disc 101 to rotate, releasing the lock between the latch 103 and the movable rod 81. Subsequently, the compression spring 84 will push the second limit block 83 and drive the movable rod 81 to move, causing the movable rod 81 to move into the interior of the mounting box 6. At this time, the positioning block 9 separates from the interior of the second positioning groove 18 and enters the interior of the first positioning groove 17, thus releasing the lock between the connecting seat 4 and the protective shell 2, facilitating the removal of the connecting seat 4 from the interior of the protective shell 2. Similarly, when installing the connecting plate 3, reverse-rotate the manual knob 102 to make the latch 103 push the movable rod 81 to move, causing the movable rod 81 to drive the positioning block 9 into the interior of the second positioning groove 18 until the latch 103 is engaged with the movable rod 81, thereby achieving the purpose of locking the connecting seat 4 and the protective shell 2 and preventing the connecting plate 3 and the connecting seat 4 from falling off.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet synchronous motor with an overheat protection function, comprising a permanent magnet motor body (1) and a protective housing (2), characterized in that: The protective housing (2) is located outside the permanent magnet motor body (1) and is fixedly connected to the permanent magnet motor body (1). A connecting plate (3) is provided on the left side of the protective housing (2). A connecting seat (4) is fixedly connected to the right side of the connecting plate (3). A cylinder body (5) is fixedly connected to the inner wall of the connecting seat (4), and the cylinder bodies (5) are distributed in a ring shape. The opposite ends of the cylinder bodies (5) are fixedly connected with mounting boxes (6). A heat dissipation fan (7) is arranged in the inner cavity of the connecting seat (4) and on the right side of the cylinder body (5). A reset mechanism (8) is arranged inside the heat dissipation fan (7). A positioning block (9) adapted to the reset mechanism (8) is embedded on the outer side of the connecting seat (4). An adjusting mechanism (10) is arranged inside the mounting box (6). Ventilation holes (11) are formed on the outer side of the protective housing (2), and the ventilation holes (11) are communicated with the inner cavity of the protective housing (2). A temperature sensor (12) is embedded on the inner wall of the protective housing (2), and the temperature sensor (12) penetrates to the outer side of the protective housing (2); The reset mechanism (8) includes a movable rod (81), a first limit block (82), a second limit block (83) and a compression spring (84). The movable rod (81) is located in the inner cavity of the cylinder body (5). One end of the movable rod (81) penetrates into the inner cavity of the mounting box (6) and is slidably connected with the mounting box (6). The first limit block (82) is fixedly connected to the inner wall of the cylinder body (5). The second limit block (83) is fixedly connected to the surface of the movable rod (81), and the second limit block (83) is located on the side of the first limit block (82) away from the positioning block (9). The compression spring (84) is sleeved on the outer side of the movable rod (81), and the two ends of the compression spring (84) are respectively fixedly connected with the first limit block (82) and the second limit block (83); The adjusting mechanism (10) includes a disc (101), a manual knob (102) and a clamping block (103). The disc (101) is located in the inner cavity of the mounting box (6) and is rotatably connected with the inner wall of the mounting box (6). The manual knob (102) is fixedly connected to the left side of the disc (101). The clamping block (103) is fixedly connected to the outer wall of the disc (101), and the clamping blocks (103) are distributed around the disc (101). The end of the movable rod (81) penetrating into the mounting box (6) is mutually clamped with the clamping block (103).

2. The permanent magnet synchronous motor with an overheat protection function according to claim 1, characterized in that: A fixing plate (13) is fixedly connected to the right side of the permanent magnet motor body (1). A sealing ring (14) is fixedly connected to the middle position of the fixing plate (13). The sealing ring (14) is rotatably connected with the output shaft of the permanent magnet motor body (1). A plurality of fixing holes (15) distributed in a ring shape are formed on the surface of the fixing plate (13).

3. A permanent magnet synchronous motor with an overheat protection function according to claim 1, characterized in that: A protective net (16) is fixedly connected to the inner wall of the connecting seat (4), and the protective net (16) is located between the mounting box (6) and the heat dissipation fan (7).

4. A permanent magnet synchronous motor with an overheat protection function according to claim 3, characterized in that: A plurality of first positioning grooves (17) are formed on the outer side of the connection seat (4). The positioning block (9) is located inside the first positioning groove (17) and is slidably connected to the inner wall of the first positioning groove (17). One end of the movable rod (81) penetrates into the first positioning groove (17) and is fixedly connected to the positioning block (9).

5. A permanent magnet synchronous motor with an overheat protection function according to claim 1, characterized in that: A plurality of second positioning grooves (18) are formed on the left side inside the protective housing (2), and the second positioning grooves (18) are annularly distributed. The position of the positioning block (9) corresponds to that of the second positioning groove (18) and is slidably connected to the inner wall of the second positioning groove (18).

6. The permanent magnet synchronous motor with an overheat protection function according to claim 1, wherein: A through hole is formed in the middle position of the connecting plate (3). The manual knob (102) is located inside the through hole, and the manual knob (102) extends to the left side of the connecting plate (3).

7. A permanent magnet synchronous motor with an overheat protection function according to claim 1, characterized in that: The diameter of the connection seat (4) is smaller than the inner diameter of the protective housing (2), and the connection seat (4) is slidably connected to the inner wall of the protective housing (2).

8. A permanent magnet synchronous motor with an overheat protection function according to claim 1, characterized in that: The number of the ventilation holes (11) is several, and the ventilation holes (11) are arranged in a ring. A dust-proof net is arranged inside the ventilation holes (11).

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