A wind-cooled heat dissipation structure for a permanent magnet synchronous motor stator

Abstract

The utility model belongs to the technical field of heat dissipation of motor stators, and discloses an air-cooled heat dissipation structure of a permanent magnet synchronous motor stator, including a stator body installed and fixed in a permanent magnet synchronous motor housing, an outer ring wall of the stator body is provided with mounting grooves with both front and rear sides being open structures, the number of mounting grooves is set to be multiple, and the multiple mounting grooves are distributed in an annular shape with equal spacing, and a heat-conducting ventilation pipe is fixedly installed in the multiple mounting grooves, a heat dissipation channel is provided on the outer ring wall of the stator body, and an arc groove is provided on the inner wall of one side of the multiple mounting grooves close to the center of the stator body, and the outer pipe walls of the multiple heat-conducting ventilation pipes are respectively fixedly connected with the arc inner walls of the corresponding arc grooves. The application has the following advantages and effects: by cooperating with the simultaneous air-cooling and heat dissipation of the inner and outer layers of the stator body, the air-cooling and heat dissipation effect of the stator body can be effectively improved, and the phenomenon of the stator body being damaged by high temperature can be greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motor stator heat dissipation, and in particular to an air-cooled heat dissipation structure of a permanent magnet synchronous motor stator. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, making the motor structure simpler, reducing processing and assembly costs, and eliminating collector rings and brushes that are prone to problems, improving the reliability of motor operation; and because no excitation current is required, there is no excitation loss, which improves the efficiency and power density of the motor. Permanent magnet synchronous motors are composed of components such as stators, rotors, and end covers. The stator is basically the same as an ordinary induction motor, and a laminated structure is used to reduce the iron loss during motor operation. The stator winding is the main heat source during the operation of the permanent magnet synchronous motor. When the winding temperature rises above the temperature limit specified by the motor insulation level, there is a risk of damage to the armature winding insulation, which in turn causes the motor to short-circuit. In order to avoid the above situation, it is necessary to cool the motor stator during the operation of the permanent magnet synchronous motor.

[0003] In the related art, the heat dissipation method of permanent magnet synchronous motors basically adopts surface natural cooling or coolant cooling. Among them, the surface natural cooling method generally increases the heat dissipation surface area of ​​the motor. An aluminum shell with low thermal resistance and good heat dissipation effect is put on the outside of the motor stator, and heat sinks are distributed on the surface of the shell. The heat is cooled by the heat radiation on the surface of the motor shell and the natural flow of air. No other special cooling device is installed. The heat generated during the operation of the permanent magnet synchronous motor is dissipated outward through channels such as the stator core, stator winding, and motor shell. The radial heat dissipation channel is too long, resulting in a large total thermal resistance of the motor, and the heat of the motor is difficult to dissipate, resulting in unsatisfactory heat dissipation effect. However, this heat dissipation method has a simple structure, basically no maintenance, and low manufacturing cost. The advantages of low temperature and strong environmental adaptability are that the surface natural cooling method has the advantages of simple structure and strong environmental adaptability, but its cooling effect is not good, and there is a disadvantage that the external dimensions increase due to the need to increase the surface heat dissipation area; the coolant cooling method generally involves a water-cooled shell on the outside of the motor stator, and the shell has a spiral water channel or an axial water channel. The heat generated during the operation of the permanent magnet synchronous motor is taken away by the coolant circulating in the water channel. The specific heat capacity of water is large and the heat dissipation capacity is good, so this method has a better heat dissipation effect. At the same time, this heat dissipation method also has the disadvantages of complex internal structure, increased leakage-proof sealing requirements, increased manufacturing cost, and limited environmental adaptability. The cooling effect is good, but its structure is complex, maintenance remains unchanged, and environmental adaptability is poor.

[0004] Therefore, we propose an air-cooling heat dissipation structure for the stator of a permanent magnet synchronous motor to solve the above problems. Utility Model Content

[0005] The purpose of the present application is to provide an air-cooling heat dissipation structure for a permanent magnet synchronous motor stator, which can effectively improve the air-cooling heat dissipation effect of the stator body by simultaneously performing air cooling and heat dissipation on the inner and outer layers of the stator body, and can greatly reduce the effect of the stator body being damaged by high temperature.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] A wind-cooled heat dissipation structure for a permanent magnet synchronous motor stator comprises a stator body fixedly installed in a permanent magnet synchronous motor casing, an outer ring wall of the stator body is provided with a mounting groove with openings on both the front and rear sides, the number of the mounting grooves is set to be multiple, the multiple mounting grooves are distributed in an annular shape with equal intervals, heat-conducting ventilation pipes are fixedly installed in the multiple mounting grooves, and a heat dissipation channel is provided on the outer ring wall of the stator body.

[0008] The present application is further configured as follows: arc-shaped grooves are provided on the inner walls of a plurality of mounting slots close to the center of the stator body, and the outer tube walls of a plurality of heat-conductive ventilation pipes are respectively fixedly connected to the arc-shaped inner walls of the corresponding arc-shaped grooves.

[0009] The present application is further configured as follows: the installation groove is filled with a potting glue layer, and the outer surface of the potting glue layer is in contact with the inner wall of the permanent magnet synchronous motor casing.

[0010] The present application is further configured as follows: a plurality of reinforcing ribs are fixedly installed in the installation groove, and the plurality of reinforcing ribs are arranged at equal intervals and are all located in the potting glue layer.

[0011] The present application is further configured as follows: the heat-conductive ventilation pipe is made of ceramic material.

[0012] The present application is further configured as follows: the number of the heat dissipation channels is set to be multiple, and the multiple heat dissipation channels are evenly distributed in a ring shape.

[0013] The present application includes at least one of the following beneficial technical effects:

[0014] The present application utilizes the good thermal conductivity of multiple heat-conductive ventilation ducts during the process of air flow circulating inside the multiple heat-conductive ventilation ducts, and can transfer part of the heat inside the stator body to the air flow through the multiple heat-conductive ventilation ducts. The air flow can take away part of the heat inside the stator body, thereby achieving the effect of air-cooling and heat dissipation of the stator body. At the same time, another part of the heat inside the stator body will also be transferred to multiple potting glue layers through the multiple heat-conductive ventilation ducts. The excellent thermal conductivity of the potting glue layers can quickly transfer the heat to the permanent magnet synchronous motor casing, and then the heat is dissipated through the permanent magnet synchronous motor casing, so that another part of the heat in the stator body can be taken away in time, further improving the effect of air-cooling and heat dissipation of the stator body.

[0015] In the present application, the air flow absorbs part of the heat from the outer layer of the stator body during the process of air flow passing through multiple heat dissipation channels. The air flow can take away part of the heat from the outer layer of the stator body, thereby further improving the air-cooling and heat dissipation effect on the stator body.

[0016] The present application can effectively improve the air-cooling and heat dissipation effect of the stator body by simultaneously air-cooling the inner and outer layers of the stator body, and can greatly reduce the phenomenon of the stator body being damaged by high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0018] Figure 2 It is a schematic diagram of the main cross-sectional structure of this embodiment.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the stator body without the heat-conducting ventilation pipe.

[0020] In the figure, 1. permanent magnet synchronous motor casing; 2. stator body; 3. mounting slot; 4. arc-shaped groove; 5. heat-conducting ventilation duct; 6. potting glue layer; 7. reinforcing ribs; 8. heat dissipation channel. DETAILED DESCRIPTION

[0021] The technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0022] See also Figure 1 , Figure 2 and Figure 3The present application provides an air-cooling heat dissipation structure of a permanent magnet synchronous motor stator, comprising a stator body 2 installed and fixed in a permanent magnet synchronous motor housing 1, an outer ring wall of the stator body 2 is provided with an installation groove 3 with opening structures on both the front and rear sides, the number of the installation grooves 3 is set to be multiple, and the multiple installation grooves 3 are distributed in an annular shape with equal intervals, and a heat-conducting ventilation pipe 5 is fixedly installed in the multiple installation grooves 3. By setting multiple installation grooves 3, it is convenient to install multiple heat-conducting ventilation pipes 5 on the stator body 2. By utilizing the good thermal conductivity of the heat-conducting ventilation pipe 5, when the air flow passes through the heat-conducting ventilation pipe 5, part of the heat inside the stator body 2 can be transferred to the air flow through the heat-conducting ventilation pipe 5, and part of the heat inside the stator body 2 can be taken away by the air flow, so as to achieve the effect of air-cooling and heat dissipation of the stator body 2, and a heat dissipation channel 8 is provided on the outer ring wall of the stator body 2. When the air flow passes through the heat dissipation channel 8, the air flow will absorb part of the heat of the outer layer of the stator body 2, and part of the heat of the outer layer of the stator body 2 can be taken away by the air flow, so as to further improve the effect of air-cooling and heat dissipation of the stator body 2.

[0023] In this embodiment, it should be noted that the above-mentioned air flow is generated by the high-speed rotation of the cooling fan installed at the rear of the permanent magnet synchronous motor casing 1. The installation of a cooling fan at the rear of the permanent magnet synchronous motor casing 1 is a conventional technical means in this field, so it will not be repeated in this article.

[0024] In this embodiment, in order to allow the outer tube wall of the heat-conductive ventilation duct 5 to be in more complete contact with the stator body 2, so that the heat in the stator body 2 can be more effectively transferred to the heat-conductive ventilation duct 5, arc-shaped grooves 4 are opened on the inner walls of one side of multiple installation grooves 3 close to the center of the stator body 2, and the outer tube walls of the multiple heat-conductive ventilation ducts 5 are respectively fixedly connected to the arc-shaped inner walls of the corresponding arc-shaped grooves 4.

[0025] In this embodiment, the mounting groove 3 is filled with a potting glue layer 6, and the outer surface of the potting glue layer 6 is in contact with the inner wall of the permanent magnet synchronous motor casing 1. By utilizing the excellent thermal conductivity of the potting glue layer 6, when the heat inside the stator body 2 is transferred to the heat-conductive ventilation duct 5, the heat transfer speed to the permanent magnet synchronous motor casing 1 can be accelerated, and then the heat is dissipated through the permanent magnet synchronous motor casing 1, so that the heat in the stator body 2 can be taken away in time, thereby improving the air-cooling and heat dissipation effect of the stator body 2.

[0026] In this embodiment, in order to enhance the strength of the stator body 2 , a plurality of reinforcing ribs 7 are fixedly installed in the installation groove 3 . The plurality of reinforcing ribs 7 are arranged at equal intervals and are all located in the potting glue layer 6 .

[0027] In this embodiment, in order to make the heat-conducting ventilation pipe 5 have good heat-conducting performance and insulation performance, the heat-conducting ventilation pipe 5 is made of ceramic material.

[0028] In this embodiment, in order to improve the comprehensiveness of air-cooling the outer layer of the stator body 2, the number of the heat dissipation channels 8 is set to be multiple, and the multiple heat dissipation channels 8 are evenly distributed in a ring shape.

[0029] Through the above structure, the air-cooling heat dissipation structure of the permanent magnet synchronous motor stator provided by the present application, when in specific use, during the practical operation of the permanent magnet synchronous motor, the cooling fan installed at the rear of the permanent magnet synchronous motor casing 1 will also rotate at high speed to generate air flow, and the permanent magnet synchronous motor is cooled and dissipated by air. By utilizing the air flow to circulate through multiple heat-conducting ventilation pipes 5, the good thermal conductivity of the multiple heat-conducting ventilation pipes 5 can be utilized to transfer part of the heat inside the stator body 2 to the air flow through the multiple heat-conducting ventilation pipes 5, and the air flow can be used to take away part of the heat inside the stator body 2, thereby achieving the effect of air-cooling and heat dissipation of the stator body 2. At the same time, another part of the heat inside the stator body 2 will also pass through multiple heat-conducting ventilation pipes The tube 5 is transferred to multiple potting glue layers 6. The excellent thermal conductivity of the potting glue layer 6 can quickly transfer the heat to the permanent magnet synchronous motor casing 1, and then the heat is dissipated through the permanent magnet synchronous motor casing 1, so that another part of the heat in the stator body 2 can be taken away in time, further improving the air-cooling and heat dissipation effect of the stator body 2. In the process of air flow passing through multiple heat dissipation channels 8, the air flow will absorb part of the heat of the outer layer of the stator body 2. The air flow can take away part of the heat of the outer layer of the stator body 2, and further improve the air-cooling and heat dissipation effect of the stator body 2. Then, by simultaneously air-cooling and heat dissipating the inner and outer layers of the stator body 2, the air-cooling and heat dissipation effect of the stator body 2 can be effectively improved.

Claims

1. An air-cooling heat dissipation structure for a permanent magnet synchronous motor stator, characterized in that: The invention comprises a stator body (2) fixedly mounted in a permanent magnet synchronous motor casing (1), wherein an outer ring wall of the stator body (2) is provided with a mounting groove (3) with openings on both the front and rear sides, the number of the mounting grooves (3) is set to be multiple, the multiple mounting grooves (3) are distributed in an annular shape with equal spacing, a heat-conducting ventilation pipe (5) is fixedly mounted in each of the multiple mounting grooves (3), and a heat dissipation channel (8) is provided on the outer ring wall of the stator body (2).

2. The air-cooling heat dissipation structure of the permanent magnet synchronous motor stator according to claim 1 is characterized in that: An arc-shaped groove (4) is provided on the inner wall of one side of the plurality of mounting grooves (3) close to the center of the stator body (2), and the outer tube walls of the plurality of heat-conducting ventilation pipes (5) are respectively fixedly connected to the arc-shaped inner walls corresponding to the arc-shaped grooves (4).

3. The air-cooling heat dissipation structure of the permanent magnet synchronous motor stator according to claim 1 is characterized in that: The installation groove (3) is filled with a potting glue layer (6), and the outer surface of the potting glue layer (6) is in contact with the inner wall of the permanent magnet synchronous motor casing (1).

4. The air-cooling heat dissipation structure of the permanent magnet synchronous motor stator according to claim 3 is characterized in that: A plurality of reinforcing ribs (7) are fixedly mounted in the mounting groove (3); the plurality of reinforcing ribs (7) are arranged at equal intervals and are all located in the potting glue layer (6).

5. The air-cooling heat dissipation structure of the permanent magnet synchronous motor stator according to claim 1 is characterized in that: The heat-conducting ventilation pipe (5) is made of ceramic material.

6. The air-cooling heat dissipation structure of the permanent magnet synchronous motor stator according to claim 1 is characterized in that: The number of the heat dissipation channels (8) is set to be multiple, and the multiple heat dissipation channels (8) are evenly distributed in a ring shape.

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