An inner rotor motor that effectively prevents temperature rise

Abstract

The present invention provides an inner rotor motor that effectively prevents temperature rise, relates to the field of motor technology, and includes an end cover and an end cover bracket, an end of the end cover close to the end cover bracket is provided with an output shaft frame for facilitating the extension of the inner rotor shaft, a through hole is provided on the end cover bracket for facilitating the extension of the output shaft, the outer side of the output shaft frame is evenly provided with first heat dissipation holes, the side wall of the end cover is provided with second heat dissipation holes, at least a part of the second heat dissipation holes is arc-shaped, the number of the first heat dissipation holes is at least one and all are located within the range of the through hole, and a reinforcement groove is provided between any two adjacent first heat dissipation holes. The inner rotor motor that effectively prevents temperature rise of the present invention can be applied to the situation where the inner rotor motor rotates at a high speed, effectively prevents temperature rise, has reasonable heat dissipation, simple structure, low requirements on the use environment, good motor stability, and can effectively reduce manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of motors.

[0002] In particular, the present invention relates to an inner rotor motor which effectively prevents temperature rise. Background Art

[0003] With the development of society and the improvement of people's living standards, people have higher and higher requirements for mechanical automation, and the operation of machinery cannot be separated from motors.

[0004] The motor is a carrier that drives the mechanical equipment to rotate. The end cover is a cover installed behind the motor and other housings. The motor needs to have a complete end cover structure and protective housing to connect to the other end of the drag carrier equipment (referring to the equipment connected to the motor output shaft), and to protect the motor's own operating environment for a long time. It can operate for a long time under the conditions that meet the requirements. In order to ensure that the motor can operate normally and stably with load, the motor will generate heat when it is running with load, and the temperature rise will gradually increase; a motor end cover with a corresponding structure is required for protection to prevent the motor from generating heat during long-term operation, causing the end cover bearing chamber to expand due to thermal expansion, resulting in abnormal relative motion offset of the transition-fit bearing on the motor output shaft and other safety hazards.

[0005] For example, Chinese patent invention patent CN104467240A discloses an integrated motor end cover, including a motor end cover and an actuator end cover; a boss is provided on the motor end cover; a stop is provided on the actuator end cover; the motor end cover and the actuator end cover are an integrated structure; the motor end cover and the actuator end cover are connected as a whole through a connector; the central axis of the boss on the motor end cover is not coaxial with the central axis of the stop on the actuator end cover; and a plurality of reinforcing ribs are provided between the motor end cover and the actuator end cover.

[0006] However, the above motor end covers are all used in the case of fast speed of the inner rotor motor, and it is difficult to completely eliminate the temperature rise, and the heat dissipation performance is still insufficient. For example, the Chinese patent invention patent CN109861459A relates to a water pump motor with an internal forced cooling structure, including a motor housing, a plurality of water holes are arranged on the front end surface of the motor housing; a rotor shaft is fixed in the motor housing, and the axis of the rotor shaft is provided with a rotor shaft center hole that runs through the front and rear ends of the rotor shaft; a motor rotor is fixed on the rotor shaft, and a plurality of cooling water channels are arranged inside the motor rotor; a motor stator is fixed in the mounting hole of the inner cavity of the motor housing; a rotor sleeve is installed in the inner cavity of the motor stator; a water pump impeller is installed at the front end of the motor rotor; a controller housing is installed at the rear end of the motor housing; and a control circuit board is installed in the controller housing. The above water pump motor with an internal forced cooling structure can quickly remove the heat of the internal high-temperature structural parts through the cooling water flow by setting the internal forced cooling structure, effectively suppressing the temperature rise of the motor and the controller, avoiding overheating of the motor and the controller, and improving the working reliability of the water pump motor.

[0007] Although the above device can force cooling and heat dissipation to prevent temperature rise, it has a complex structure and a complex use environment. When used in an inner rotor motor, the manufacturing cost is high and the motor stability is insufficient.

[0008] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable inner rotor motor that can effectively prevent temperature rise. Summary of the invention

[0009] The object of the present invention is to provide an inner rotor motor that can be applied to situations where the speed of the inner rotor motor is fast, effectively prevents temperature rise, has reasonable heat dissipation, a simple structure, low requirements for the use environment, good motor stability, and can effectively reduce manufacturing costs.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] An inner rotor motor that effectively prevents temperature rise comprises an end cover and an end cover bracket, wherein an output shaft frame for facilitating the extension of the inner rotor shaft is arranged at one end of the end cover close to the end cover bracket, and a notch for facilitating the extension of the output shaft is arranged on the end cover bracket, and first heat dissipation holes are evenly arranged on the outer side of the output shaft frame, and second heat dissipation holes are arranged on the side wall of the end cover, and at least a part of the second heat dissipation holes is arc-shaped, the number of the first heat dissipation holes is at least one and all are located within the range of the notch, and a reinforcing groove is arranged between any two adjacent first heat dissipation holes.

[0012] As a preferred embodiment of the present invention, at least a portion of the output shaft frame is arc-shaped.

[0013] As a preferred embodiment of the present invention, the end cover bracket includes a support frame plate connected to the end cover member and a support column arranged on the edge of the support frame plate, and the support frame plate is provided with screw holes for facilitating connection with the end cover member.

[0014] As a preferred embodiment of the present invention, a connecting portion between the support column and the support frame plate is provided with a reinforcing rib.

[0015] As a preferred embodiment of the present invention, the area of ​​the support frame plate is not greater than the area of ​​the end cover.

[0016] As a preferred embodiment of the present invention, at least a portion of the support frame plate is arc-shaped.

[0017] As a preferred embodiment of the present invention, the number of the first heat dissipation hole and the number of the second heat dissipation hole are at least one.

[0018] As a preferred embodiment of the present invention, the number of the reinforcement groove is at least one.

[0019] As a preferred embodiment of the present invention, the end cover is a BMC part.

[0020] The beneficial effects of the inner rotor motor that effectively prevents temperature rise of the present invention are: it can be applied to the situation where the inner rotor motor rotates at a high speed, effectively prevents temperature rise, has reasonable heat dissipation, simple structure, low requirements for the use environment, good motor stability, and can effectively reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall installation of an inner rotor motor that effectively prevents temperature rise according to the present invention;

[0022] Figure 2 A cross-sectional schematic diagram of the connection between a first connection hole and a second connection hole in an inner rotor motor that effectively prevents temperature rise according to the present invention;

[0023] Figure 3 A schematic diagram of the installation structure of another embodiment of an inner rotor motor that effectively prevents temperature rise according to the present invention;

[0024] Among them: 1. end cover; 11. second heat dissipation hole; 2. end cover bracket; 21. support frame plate; 211. screw hole; 22. support column; 221. reinforcing rib; 3. output shaft frame; 31. first heat dissipation hole; 32. reinforcing groove, 4. notch. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of modules and structures set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0028] Technologies, methods, and systems known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and systems should be considered part of the specification.

[0029] Embodiment 1: Figure 1 , 2 The figure is only one of the embodiments of the present invention, an inner rotor motor which effectively prevents temperature rise, comprises an end cover 1 and an end cover bracket 2, the end of the end cover 1 close to the end cover bracket 2 is provided with an output shaft frame 3 for facilitating the extension of the inner rotor shaft, the end cover bracket 2 is provided with a notch 4 for facilitating the extension of the output shaft, the outer side of the output shaft frame 3 is evenly provided with first heat dissipation holes 31, the side wall of the end cover 1 is provided with second heat dissipation holes 11, at least a part of the second heat dissipation holes 11 is arc-shaped, the number of the first heat dissipation holes 31 is at least one and all are located within the range of the notch 4, and a reinforcing groove 32 is provided between any two adjacent first heat dissipation holes 31.

[0030] In the present invention, the inner rotor motor is used, and only the inner rotor shaft extends out from the output shaft frame 3 of the end cover 1 to rotate, and the entire end cover 1 does not rotate, and is used to drive the fan to rotate. The inner rotor electronics are used, the speed is fast, and the output power is high. However, due to material and process factors, the end cover 1 of the inner rotor motor driven by the general fan cannot be opened with heat dissipation holes due to the sealing of the end cover 1, and the temperature rise phenomenon is very high. If the heat is directly dissipated by opening holes, the structural strength cannot be achieved and the service life is short. Therefore, an AC asynchronous outer rotor motor is generally used to drive the fan output. In the present invention, the inner rotor motor includes an end cover 1 and an end cover bracket 2, and then holes are punched on the end cover 1 for heat dissipation. The heat dissipation holes include a first heat dissipation hole 31 at the end of the end cover 1 and a second heat dissipation hole 11 on the side of the end cover 1, and the corresponding structure is used to ensure that the structural strength of the inner rotor motor is ensured after the heat dissipation holes are opened.

[0031] First is the end cover bracket 2. Here, the end cover member 1 is generally a front end cover. The end cover bracket 2 is arranged at the end of the end cover member 1. The end cover bracket 2 includes a support frame plate 21 connected to the end cover member 1 and a support column 22 arranged on the edge of the support frame plate 21. The support frame plate 21 is provided with screw holes 211 for facilitating connection with the end cover member 1. The support frame plate 21 of the end cover bracket 2 is arranged parallel to the end cover member 1 and is detachably installed by screws. In this way, the end cover bracket 2 can also play a certain role in stabilizing the structure of the end cover member 1. The inner rotor shaft needs to extend from the output shaft frame 3 for power output, so the end cover member 1 is provided with an output shaft frame 3 for facilitating the extension of the inner rotor shaft, and the end cover bracket 2 is provided with a notch 4 for facilitating the extension of the output shaft.

[0032] At least a portion of the support frame plate 21 is arc-shaped, so the outer side of the support frame plate 21 is arc-shaped, and the notch 4 is also arc-shaped.

[0033] Next is the first heat dissipation hole 31. The first heat dissipation holes 31 are evenly arranged on the outer side of the output shaft frame 3. The number of the first heat dissipation hole 31 is at least one and all are located within the range of the notch 4, so as to facilitate the heat dissipation of the end cover 1 after the end cover bracket 2 is installed.

[0034] A reinforcing groove 32 is provided between any two adjacent first heat dissipation holes 31. The reinforcing groove 32 ensures that the strength of the first heat dissipation hole 31 is guaranteed after the top of the end cover 1 is opened at a position where there is no end cover bracket 2 to support it. Of course, the number of the reinforcing groove 32 is at least one, and the reinforcing groove 32 is also located within the range of the notch 4.

[0035] Finally, there are second heat dissipation holes 11. The side wall of the end cover 1 is provided with second heat dissipation holes 11. At least a part of the second heat dissipation holes 11 is arc-shaped. The second heat dissipation holes 11 are long strip holes evenly distributed on the side wall of the end cover 1, so that the side wall of the end cover 1 can also dissipate heat.

[0036] Here, the number of the first heat dissipation hole 31 and the number of the second heat dissipation hole 11 are both at least one, and the heat dissipation performance is better.

[0037] It should be noted that the end cover 1 is a BMC part. Because the BMC part has high mechanical strength, good creep resistance, high stability, strong heat resistance and other characteristics, the process of opening the first heat dissipation hole 31 and the second heat dissipation hole 11 on the end cover 1 is simple, and the structural strength of the end cover 1 after the holes are opened is guaranteed.

[0038] The inner rotor motor of the present invention can effectively prevent temperature rise and is suitable for the situation where the inner rotor motor rotates at a high speed. It can effectively prevent temperature rise, has reasonable heat dissipation, simple structure, low requirements on the use environment, good motor stability, and can effectively reduce manufacturing costs.

[0039] Embodiment 2: Figure 3 The figure shown is only one of the embodiments of the present invention. Different from the above embodiments, the area of ​​the support frame plate 21 is not larger than the area of ​​the end cover 1. In fact, the support frame plate 21 can only cover a part of the upper surface of the end cover 1, so that there is still a lot of free space on the upper surface of the end cover 1. At this time, the notch 4 is an open notch, so that the size of the first heat dissipation holes 31 set at the end of the end cover 1 can be larger, the number can be more, the heat dissipation effect of the motor is better, and the service life of the motor is longer.

[0040] Embodiment 3: Still as Figures 1 to 3 The figure shown is only one of the embodiments of the present invention. On the basis of the first embodiment, in an inner rotor motor of the present invention that effectively prevents temperature rise, a reinforcing rib 221 is provided at the connection portion between the support column 22 and the support frame plate 21. Since there are generally two support columns 22, there are also two reinforcing ribs 221.

[0041] The reinforcing rib 221 is generally a simple triangular reinforcing rib, but the length of its bottom side can be very short, just set to the connection foot of the support column 22 and the support frame plate 21; or it can be very long, and can extend to the notch 4 of the support frame plate 21 (such as Figure 3 As shown in FIG. 1 ), the longer the reinforcing rib 221 is, the better the effect of enhancing the structural strength of the entire end cover bracket 2 is; even, the two reinforcing ribs 221 can be arranged in parallel (as shown in FIG. Figure 1 As shown) the forces are uniform, and they can also be arranged in a non-parallel manner (such as Figure 2 As shown), at this time, the end cover 1 can be subjected to forces at multiple different angles, so that the overall structural strength of the end cover 1 is higher.

[0042] Generally speaking, the angle formed between the two reinforcing ribs 221 is 0° to 90°. When the angle is higher than 90°, the effect of sharing the force is the same as that of an angle less than 90°, that is, the force effect of an angle of 100° and an angle of 80° is the same. On the contrary, the reinforcing rib 221 with an angle of 100° is inconvenient to set, and the reinforcing rib 221 installed first will affect the installation of the reinforcing rib 221 installed later.

[0043] Embodiment 4: Still as Figures 1 to 3 The figure shown is only one of the embodiments of the present invention. On the basis of the first embodiment, in an inner rotor motor of the present invention that effectively prevents temperature rise, at least a part of the output shaft frame 3 is arc-shaped. Here, the arc-shaped extension of the output shaft frame 3 can have two aspects: first, the shape of the output shaft frame 3 itself is a cylindrical frame; second, the connection between the output shaft frame 3 and the end cover 1 is arc-shaped.

[0044] In summary, the output shaft frame 3 has three possible structures under the premise of a cylindrical frame:

[0045] The first type is that the output shaft frame 3 is recessed in the end cover 1, such as Figure 1 As shown, at this time, an inner concave hole is provided on the end cover 1, the output shaft frame 3 is arranged in the inner concave hole and extends outward, and the outer surface of the output shaft frame 3 is just flush with the outer surface of the end cover 1, and the first heat dissipation hole 31 is arranged outside the inner concave hole;

[0046] The second type is that the output shaft frame 3 is partially recessed in the end cover 1, such as Figure 2 As shown, at this time, an inner concave hole is provided on the end cover 1, and the output shaft frame 3 is provided in the inner concave hole and extends outward, and the outer surface of the output shaft frame 3 exceeds the outer surface of the end cover 1. At this time, an arc-shaped supporting surface is provided in the inner concave hole and connected to the side of the output shaft frame 3 to ensure the stability of the output shaft frame 3. At this time, the first heat dissipation hole 31 is provided on the outer side of the arc-shaped supporting surface of the inner concave hole;

[0047] The third type is that the output shaft frame 3 extends to the outside of the end cover 1 . In this case, the bottom end of the output shaft frame 3 is flush with the outer surface of the end cover 1 , and the output shaft frame 3 extends outward. In this case, the first heat dissipation hole 31 is arranged outside the output shaft frame 3 .

[0048] The inner rotor motor of the present invention can effectively prevent temperature rise and is suitable for the situation where the inner rotor motor rotates at a high speed. It can effectively prevent temperature rise, has reasonable heat dissipation, simple structure, low requirements on the use environment, good motor stability, and can effectively reduce manufacturing costs.

[0049] The above-described embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. An inner rotor motor that effectively prevents temperature rise, characterized in that: The invention comprises an end cover member (1) and an end cover bracket (2), wherein an output shaft frame (3) for facilitating the extension of an inner rotor shaft is arranged at one end of the end cover member (1) close to the end cover bracket (2), a notch (4) for facilitating the extension of the output shaft is arranged on the end cover bracket (2), first heat dissipation holes (31) are evenly arranged on the outer side of the output shaft frame (3), a second heat dissipation hole (11) is arranged on the side wall of the end cover member (1), at least a part of the second heat dissipation hole (11) is arc-shaped, the first heat dissipation holes (31) are all located within the range of the notch (4), and a reinforcing groove (32) is arranged between any two adjacent first heat dissipation holes (31); the reinforcing groove ensures that the strength is guaranteed after the first heat dissipation hole is opened at the top of the end cover member where no end cover bracket is provided to support it; The end cover bracket (2) comprises a support frame plate (21) connected to the end cover member (1) and a support column (22) arranged at an edge of the support frame plate (21); the area of ​​the support frame plate (21) is not greater than the area of ​​the end cover member (1); the end cover member (1) is a BMC member; at least a portion of the output shaft frame (3) is arc-shaped; and screw holes (211) are arranged on the support frame plate (21) for facilitating connection with the end cover member (1).

2. An inner rotor motor that effectively prevents temperature rise according to claim 1, characterized in that: A reinforcing rib (221) is provided at the connection portion between the support column (22) and the support frame plate (21).

3. The inner rotor motor that effectively prevents temperature rise according to claim 1 is characterized in that: At least a portion of the support frame plate (21) is arc-shaped.

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