Radial heat dissipation structure of permanent magnet synchronous motor

Abstract

According to the radial heat dissipation structure of the permanent magnet synchronous motor, a centrifugal impeller is arranged in a heat dissipation shell and fixedly installed on a rotating shaft of the motor, a plurality of heat dissipation holes are formed in the positions, corresponding to the centrifugal impeller, of the side face of the heat dissipation shell, a main shell is fixedly connected with the heat dissipation shell, and a stator and a rotor are arranged in the main shell; a plurality of air inlet holes are formed in the end face of the main shell, and when the centrifugal impeller rotates, air can be sucked into the main shell from the air inlet holes and blown out from the heat dissipation holes of the heat dissipation shell. According to the radial heat dissipation structure of the permanent magnet synchronous motor, heat dissipated when the stator and the rotor in the main shell work can be forcibly extracted from the heat dissipation holes in the side face of the heat dissipation shell, and by means of the radial heat dissipation mode, the good forced air cooling effect is guaranteed, and meanwhile the heat dissipation efficiency is improved. The motor is not influenced, and electronic elements such as a PCB and a control panel are arranged at the end part of the heat dissipation shell.

Description

Technical Field

[0001] The utility model belongs to the field of motors, and particularly relates to a radial heat dissipation structure of a permanent magnet synchronous motor. Background Art

[0002] Permanent magnet synchronous motors have the characteristics of high efficiency and low maintenance cost, and are suitable for fields that require long-term operation and large power loads, such as electric vehicles, industrial production, etc. During the operation of permanent magnet synchronous motors, a large amount of heat is generated inside the motors. If the heat cannot be dissipated in time, the rated temperature of the motors will be too high, thus affecting the performance and service life of the motors.

[0003] Air cooling is a common heat dissipation method for permanent magnet synchronous motors. Its principle is to use forced air flow to take away the heat generated inside the motors. Most of the existing permanent magnet synchronous motors are axially cooled, that is, a fan is set at the end cover and a wind cover is sleeved to dissipate heat inside the motor. However, for some large permanent magnet synchronous motors, electronic components such as PCB boards and control panels need to be set at their end covers to control the permanent magnet synchronous motors. Therefore, the traditional axial air cooling method is not suitable for such permanent magnet synchronous motors. Summary of the Utility Model

[0004] Based on the content in the background art, the utility model provides a radial heat dissipation structure of a permanent magnet synchronous motor, which includes a centrifugal impeller, a heat dissipation housing, a rotating shaft and a main housing;

[0005] The centrifugal impeller is arranged inside the heat dissipation housing and fixedly installed on the rotating shaft of the motor. When the rotating shaft rotates, the centrifugal impeller also rotates accordingly. A plurality of heat dissipation holes are opened at the side of the heat dissipation housing corresponding to the centrifugal impeller. The heat dissipation holes are specifically long holes, and a plurality of long holes are arranged around the side of the heat dissipation housing;

[0006] The main housing is fixedly connected with the heat dissipation housing, and the inside of the main housing is communicated with the inside of the heat dissipation housing. A stator and a rotor are arranged inside the main housing. The rotor is fixedly installed on the rotating shaft, and the stator is fixedly connected to the inner wall of the main housing. A plurality of air inlet holes are opened at the end face of the main housing. When the centrifugal impeller rotates, air can be sucked into the main housing from the air inlet holes and blown out from the heat dissipation holes of the heat dissipation housing, so as to take away the heat dissipated by the stator and the rotor when they work inside the main housing. The radial heat dissipation method set in this way can ensure good forced air cooling effect while not affecting the setting of electronic components such as PCB boards and control panels at the end of the heat dissipation housing.

[0007] Preferably, the opening end of the centrifugal impeller close to the stator is in a horn shape, which can make the hot air inside the main housing be better sucked by the centrifugal impeller.

[0008] Further, a first mounting ring is fixedly connected to the inner end face of the heat dissipation housing. A first bearing is provided between the first mounting ring and the rotating shaft. Of course, a third bearing is provided between the rotating shaft and the extended end of the main housing. The first bearing and the third bearing enable the rotating shaft to rotate smoothly. The centrifugal impeller is fixedly connected to a second mounting ring on the end face close to the first mounting ring. A second bearing is provided between the second mounting ring and the first mounting ring. Such a setting method of the second bearing can enable the centrifugal impeller to rotate more smoothly with the rotating shaft.

[0009] Further, retaining rings are respectively fixedly connected to the inner surface of the heat dissipation housing at both end faces of the centrifugal impeller. A gap is left between the retaining ring and the corresponding end face of the centrifugal impeller to avoid affecting the normal rotation of the centrifugal impeller. The heat dissipation holes on the side of the heat dissipation housing are located between the two retaining rings. When the hot air blows out from the side of the centrifugal impeller, the retaining ring can play a certain blocking role to make all the hot air blow out from the heat dissipation holes of the heat dissipation housing.

[0010] Through the above technical solutions, the present utility model has at least the following beneficial effects:

[0011] The radial heat dissipation structure of the permanent magnet synchronous motor described in this application, through the design of structures such as a centrifugal impeller, a heat dissipation housing, a rotating shaft, and a main housing, can forcibly extract the heat dissipated by the stator and rotor in the main housing from the heat dissipation holes on the side of the heat dissipation housing. Such a set radial heat dissipation method can ensure a good forced air cooling effect while not affecting the setting of electronic components such as a PCB board and a control panel at the end of the heat dissipation housing of the motor. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of a permanent magnet synchronous motor described in an embodiment of this application;

[0013] Figure 2 It is a schematic diagram of the internal structure of a permanent magnet synchronous motor described in an embodiment of this application (the heat dissipation housing and the main housing are hidden in the figure);

[0014] Figure 3 It is a schematic diagram of the structure of the heat dissipation housing described in an embodiment of this application;

[0015] Figure 4 It is a partial schematic diagram of the centrifugal impeller at the second mounting ring described in an embodiment of this application. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0017] In the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship are only for illustrative purposes and should not be construed as a limitation of this patent. If there are terms such as "first", "second", etc., they are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of the said features. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0018] In the description of the utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Reference Figures 1 to 4 to a radial heat dissipation structure of a permanent magnet synchronous motor, which includes a centrifugal impeller 1, a heat dissipation housing 2, a rotating shaft 3, and a main housing 4;

[0020] The centrifugal impeller 1 is arranged inside the heat dissipation housing 2 and fixedly installed on the rotating shaft 3 of the motor. When the rotating shaft 3 rotates, the centrifugal impeller 1 also rotates accordingly. A plurality of heat dissipation holes 201 are provided at the corresponding position of the side surface of the heat dissipation housing 2. The heat dissipation holes 201 are specifically elongated holes, and a plurality of elongated holes are arranged around the side surface of the heat dissipation housing 2;

[0021] The main housing 4 is fixedly connected to the heat dissipation housing 2, the inside of the main housing 4 is communicated with the inside of the heat dissipation housing 2. A stator 7 and a rotor are arranged inside the main housing 4. The rotor is fixedly installed on the rotating shaft 3, the stator 7 is fixedly connected to the inner wall of the main housing 4. A plurality of air inlet holes 401 are provided at the end surface of the main housing 4. When the centrifugal impeller 1 rotates, air can be sucked into the main housing 4 from the air inlet holes 401 and blown out from the heat dissipation holes 201 of the heat dissipation housing 2, so as to take away the heat dissipated by the stator 7 and the rotor when they are working inside the main housing 4. With such a radial heat dissipation method, while ensuring a good forced air cooling effect, it does not affect the setting of electronic components such as a PCB board 5 and a control panel 6 at the end of the heat dissipation housing 2.

[0022] Reference Figure 3 and Figure 4 , a first mounting ring 202 is fixedly connected to the inner end surface of the heat dissipation housing 2. A first bearing 8 is provided between the first mounting ring 202 and the rotating shaft 3. Of course, a third bearing 10 is provided between the rotating shaft 3 and the extended end 402 of the main housing 4. The first bearing 8 and the third bearing 10 enable the rotating shaft 3 to rotate smoothly; a second mounting ring 101 is fixedly connected to the end surface of the centrifugal impeller 1 close to the first mounting ring 202. A second bearing 9 is provided between the second mounting ring 101 and the first mounting ring 202. With such a setting method of the second bearing 9, the centrifugal impeller 1 can rotate more smoothly with the rotating shaft 3.

[0023] Reference Figure 2 , the opening end of the centrifugal impeller 1 close to the stator 7 is in a horn shape, which can enable the hot air in the main housing 4 to be better sucked by the centrifugal impeller 1.

[0024] Reference Figure 3 , retaining rings 203 are respectively fixedly connected to the inner surface of the heat dissipation housing 2 at both end surfaces of the centrifugal impeller 1. A gap is left between the retaining rings 203 and the corresponding end surfaces of the centrifugal impeller 1 to avoid affecting the normal rotation of the centrifugal impeller 1. The heat dissipation holes 201 on the side surface of the heat dissipation housing 2 are located between the two retaining rings 203. When the hot air is blown out from the side of the centrifugal impeller 1, the retaining rings 203 can play a certain blocking role, so that all the hot air can be blown out from the heat dissipation holes 201 of the heat dissipation housing 2, improving the heat dissipation effect.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Based on the present invention as a revelation, through the above description, relevant personnel can completely make various changes and modifications within the scope not deviating from the technical idea of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A radial heat dissipation structure of a permanent magnet synchronous motor, characterized in that: It comprises a centrifugal impeller (1), a heat dissipation housing (2), a rotating shaft (3) and a main housing (4); The centrifugal impeller (1) is arranged in a heat dissipation housing (2) and fixedly mounted on a rotating shaft (3) of a motor; a plurality of heat dissipation holes (201) are provided on the side of the heat dissipation housing (2) at positions corresponding to the centrifugal impeller (1); the main housing (4) is fixedly connected to the heat dissipation housing (2); a stator (7) and a rotor are provided in the main housing (4); a plurality of air inlet holes (401) are provided on the end surface of the main housing (4); when the centrifugal impeller (1) rotates, air can be sucked into the main housing (4) from the air inlet holes (401) and blown out from the heat dissipation holes (201) of the heat dissipation housing (2).

2. The radial heat dissipation structure of a permanent magnet synchronous motor according to claim 1, characterized in that: The opening end of the centrifugal impeller (1) close to the stator (7) is in a trumpet shape.

3. The radial heat dissipation structure of a permanent magnet synchronous motor according to claim 1, characterized in that: The inner surface of the heat dissipation shell (2) is fixedly connected to retaining rings (203) at both end surfaces of the centrifugal impeller (1), a gap is left between the retaining ring (203) and the corresponding end surfaces of the centrifugal impeller (1), and the heat dissipation hole (201) on the side surface of the heat dissipation shell (2) is located between the two retaining rings (203).

4. A radial heat dissipation structure of a permanent magnet synchronous motor according to claim 1, 2 or 3, characterized in that: A first mounting ring (202) is fixedly connected to the inner end surface of the heat dissipation housing (2), a first bearing (8) is arranged between the first mounting ring (202) and the rotating shaft (3), and a second mounting ring (101) is fixedly connected to the end surface of the centrifugal impeller (1) close to the first mounting ring (202), and a second bearing (9) is arranged between the second mounting ring (101) and the first mounting ring (202).

Images