An air-cooled permanent magnet motor device

Abstract

This invention discloses an air-cooled permanent magnet motor device, including a motor stator, a motor rotor, and a permanent magnet motor housing. Cold air inlets and hot air outlets are respectively provided on the end housing and the middle housing. The motor rotor also has radial ventilation holes. Cooling air enters both ends of the motor stator through the cold air inlets; a small portion flows from the stator-rotor air gap to the motor stator, while the majority flows from the rotor radial ventilation holes to the motor stator and exits from the hot air outlet of the middle housing. The motor device is cooled by forced air cooling. This invention optimizes the cooling structure, reduces airflow resistance, and improves cooling uniformity, providing better cooling for the motor rotor and stator.

Description

Technical Field

[0001] This invention belongs to the field of electric motors, and specifically relates to an air-cooled permanent magnet motor device. Background Technology

[0002] As motor devices become larger and more powerful, the heat dissipation problem becomes more prominent due to the increased power.

[0003] Traditional cooling methods involve axial forced air cooling, with the cooling channel being the air gap between the stator and rotor, the cooling area being the air gap surface between the stator and rotor, and the cooling direction being axial forced ventilation from one end of the stator to the other. This method has disadvantages such as high wind resistance and uneven heat dissipation, which greatly limits the development of large-scale motor devices. Summary of the Invention

[0004] This invention proposes an air-cooled permanent magnet motor device that can reduce the heat generation of the rotor, optimize the cooling structure to reduce the air resistance of the air path, optimize the uniformity of cooling, and provide better cooling effect.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an air-cooled permanent magnet motor device, comprising a motor stator, a motor rotor, and a permanent magnet motor housing composed of a drive end cover, an end housing, a middle housing, and a non-drive end cover; the end housing and the middle housing are respectively provided with a cold air inlet and a hot air outlet, and the motor rotor is also provided with a rotor radial ventilation hole. Cooling air enters from both ends of the motor stator through the cold air inlet of the end housing, a small portion flows from the stator-rotor air gap to the motor stator, and most of the air flows from the rotor radial ventilation hole to the motor stator, and flows out from the hot air outlet of the middle housing, thereby cooling the motor device by forced air cooling.

[0006] The aforementioned air-cooled permanent magnet motor device comprises a stator core, windings, end pressure plates, stator tie rods, and stator support plates for ventilation. The stator core and stator support plates are spaced apart and fixed by stator tie rods and end pressure plates, with the windings embedded in the stator core.

[0007] The air-cooled permanent magnet motor device has a motor rotor composed of a rotating shaft, a bracket, a magnetic pole box, a permanent magnet, a rotor tie rod, and rotor supports aligned with the stator supports. Radial ventilation openings are provided on the bracket, and the permanent magnet and the stator core are aligned.

[0008] The radial ventilation opening of the air-cooled permanent magnet motor device is located at the dovetail protrusion of the bracket and is on the same axial plane as the stator support plate.

[0009] The air-cooled permanent magnet motor device further includes a sealing component on its motor rotor. The sealing component, the rotating shaft, the drive end cover, the end housing, the middle housing, and the non-drive end cover form a sealed cavity to ensure that external water cannot enter the housing, while ensuring that cooling air can circulate according to the designed airflow path.

[0010] The air-cooled permanent magnet motor device described above has its permanent magnet and pole box bonded together with adhesive, and the pole box connected to the bracket by bolts.

[0011] The air-cooled permanent magnet motor device has a radial support structure. The radial support should avoid the bolt installation position of the permanent magnet. The radial support can be intermittent or through-type on both sides.

[0012] The beneficial effects of the present invention are as follows: The present invention cools the motor device by means of forced air cooling. The cooling air path is that the air enters from the end housing, passes through the stator end, the stator air gap channel and the rotor radial channel to cool the rotor, then passes through the stator slot plate channel to cool the stator, and finally flows from the stator core radial channel to the outlet of the middle housing, thereby realizing the cooling of the motor device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 The airflow direction of this invention;

[0015] Figure 3 This is a schematic diagram of the structure of the motor stator of the present invention;

[0016] Figure 4 This is a schematic diagram of the motor rotor of the present invention;

[0017] Figure 5 The positions of the stator support laminations and rotor support laminations of this invention;

[0018] Figure 6 This is a schematic diagram of the rotor support laminations of the present invention;

[0019] Figure 7 Special considerations for the position of stator and rotor support laminations

[0020] Figure 8 This is a schematic diagram of the rotor ventilation holes and pressure blocks of the present invention;

[0021] Figure 9 This is a schematic diagram of the rotor support structure of the present invention;

[0022] Figure 10 This is a schematic diagram of the spoke structure at the rotor ventilation hole of the present invention.

[0023] The reference numerals in the attached figures are as follows: 1—motor stator, 1-1—stator core, 1-2—winding, 1-3—stator support lamination, 1-4—end pressure plate, 1-5—stator tie rod, 2—motor rotor, 2-1—shaft, 2-2—sealing assembly, 2-3—bracket, 2-4—pole box, 2-5—permanent magnet, 2-6—rotor support lamination, 2-7—pressure block, 2-8—rotor tie rod, 2-9—rotor radial ventilation hole, 3—permanent magnet motor housing, 3-1—drive end cover, 3-2—end housing, 3-3—middle housing, 3-4—non-drive end cover. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the various components in the drawings are drawn to a specific scale, these proportional relationships are merely exemplary, and those skilled in the art can adjust them as needed to adapt to specific application scenarios.

[0025] It should be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the direction or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0026] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] According to one example of the invention, reference is made to... Figure 1 A wind-cooled permanent magnet motor device includes a motor stator 1, a motor rotor 2, and a permanent magnet motor housing 3. The motor stator 1 is installed in the permanent magnet motor housing 3, the motor rotor 2 is assembled with the motor stator 1, and finally, end caps are installed to form the permanent magnet motor device.

[0028] The motor stator 1 consists of a stator core 1-1, windings 1-2, end pressure plates 1-4, stator tie rods 1-5, and stator support plates 1-3 for ventilation. The stator core 1-1 and stator support plates 1-3 are spaced apart and fixed by the stator tie rods 1-5 and end pressure plates 1-4. The windings 1-2 are embedded in the stator core 1-1. The stator support plates 1-3 are the ventilation structure of the stator. To ensure airflow, the height of the support plates is recommended to be 6-10mm. For installation, the angle of the support plates is recommended to be 120-150°. Figure 3 As shown.

[0029] The motor rotor 2 consists of a rotating shaft 2-1, a bracket 2-3, a magnetic pole box 2-4, a permanent magnet 2-5, a rotor tie rod 2-8, and rotor support plates 2-6 aligned with the stator support plates 1-3. The rotating shaft 2-1 is connected to the bracket 2-3. The permanent magnet 2-5 is first connected to the magnetic pole box 2-4. The magnetic pole box 2-4 is installed on the rotor bracket 2-3. The rotor support plates 2-6 and the magnetic pole box 2-4 are alternately distributed. The magnetic pole box 2-4 and the rotor support plates 2-6 are fixed by the tie rod. A pressure block 2-7 can be added to the circumference of the magnetic pole box 2-4 for limiting. The sealing assembly is installed on the rotating shaft 2-1, forming the permanent magnet motor rotor 2, the spokes of the bracket 2-3, and the ventilation structure of the rotor with ventilation holes.

[0030] like Figure 4 As shown. Radial ventilation openings are provided on bracket 2-3, and permanent magnet 2-5 should be aligned with stator core 1-1; rotor support lamination 2-6 and stator support lamination 1-3 have the same thickness. Figure 5 As shown. Rotor support plates 2-6 should have good strength and can be designed as brackets 2-3, or as solid pieces, such as... Figure 6 As shown. Considering the change in electromagnetic field caused by the axial movement of the shaft 2-1, each permanent magnet segment 2-5 is increased by 0.5-1mm at both ends. Therefore, the thickness of the rotor support 2-6 is correspondingly reduced by 1-2mm. Figure 7 As shown. In special cases, the magnets may not be segmented or the magnets may fill the positions of rotor support plates 2-6.

[0031] The permanent magnet motor housing 3 consists of a drive end cover 3-1, an end housing 3-2, a middle housing 3-3, and a non-drive end cover 3-4. The end housing 3-2 and the middle housing 3-3 are respectively provided with a cold air inlet and a hot air outlet. The motor rotor 2 is also provided with rotor radial ventilation holes 2-9. Cooling air enters the stator 1 from both ends through the cold air inlet of the end housing 3-2. A small portion flows from the stator-rotor air gap to the stator 1, and the majority flows from the rotor radial ventilation holes 2-9 to the stator 1, exiting from the hot air outlet of the middle housing 3-3. After cooling the rotor through the stator end, stator air gap channel, and rotor radial channel, it then cools the stator through the stator slot channel, and finally flows from the stator core 1-1 radial channel to the middle housing outlet, achieving forced air cooling. Figure 2 As shown.

[0032] The permanent magnet motor housing 3 is distributed on the left and right sides. The end housing 3-2 is the air inlet, and the middle housing 3-3 is the air outlet. The drive end cover 3-1, the end housing 3-2, the middle housing 3-3, the non-drive end cover 3-4, the rotating shaft 2-1 and the sealing assembly 2-2 form a sealed cavity to ensure that external water cannot enter the housing, while ensuring that the cooling air can circulate according to the designed airflow path.

[0033] The radial ventilation opening is located at the dovetail protrusion of bracket 2-3, and it is on the same axial plane as stator support plate 1-3. Considering manufacturing, the radial ventilation hole can be circular or rectangular, such as... Figure 8 As shown.

[0034] The permanent magnet 2-5 and the magnetic pole box 2-4 are bonded together with adhesive. The magnetic pole box 2-4 is connected to the bracket 2-3 with bolts. The magnetic pole box 2-4 can also be limited by a pressure block 2-7, but the pressure block 2-7 should not obstruct the radial ventilation holes. Figure 8 As shown.

[0035] The bracket 2-3 is a spoke type. The spokes should avoid the bolt mounting position of the permanent magnet 2-5 to facilitate bolt installation and maintenance. Simultaneously, the bracket 2-3 increases airflow in the rotor duct when rotating. Figure 9 As shown. Specifically, when the spokes block the radial ventilation holes to avoid the mounting positions of the permanent magnet 2-5 bolts, the spokes can be opened intermittently or through on both sides, as shown. Figure 10 As shown, this ensures the uniformity of radial ventilation in the rotor.

[0036] The air-cooled permanent magnet motor device of the present invention optimizes the cooling structure, reduces the wind resistance of the air path, optimizes the uniformity of cooling, and provides better cooling effect for the rotor and stator of the motor.

[0037] The primary cooling method for the permanent magnet motor is forced air cooling. The cooling airflow path for the air-cooled permanent magnet motor is as follows: air enters from the end housing 3-2, passes through the stator end, stator air gap channel, and rotor radial channel to cool the rotor, then passes through the stator slot channel to cool the stator, and finally flows from the stator core 1-1 radial channel to the outlet in the middle housing. Figure 2 As shown.

[0038] Specifically, heat dissipation is achieved through convection between the structural components and water. If the air-cooled permanent magnet motor is immersed in water, the stator of the motor is cooled by heat conduction to the outer surface of the casing, which is then cooled by convection with the water. The rotor of the motor is cooled by heat conduction to the outer surface of the shaft 2-1, which is then cooled by convection with the water.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application embodiments. Other embodiments, such as the dimensions and forms of rotor support plates 2-6, the dimensions and forms of stator support plates 1-3, and the forms of pressure blocks 2-7, should be within the scope of protection of this patent. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A wind-cooled permanent magnet motor device, characterized in that: The motor includes a stator (1), a rotor (2), and a permanent magnet motor housing (3) consisting of a drive end cover (3-1), an end housing (3-2), a middle housing (3-3), and a non-drive end cover (3-4). The end housing (3-2) and the middle housing (3-3) are respectively provided with a cold air inlet and a hot air outlet. The rotor (2) is provided with a rotor radial ventilation hole (2-9). Cooling air enters both ends of the stator (1) through the cold air inlet, partly flowing from the stator-rotor air gap to the stator (1), and partly flowing from the rotor radial ventilation hole (2-9) to the stator (1), exiting from the hot air outlet to cool the motor. The stator (1) consists of a stator core (1-1), windings (1-2), end pressure plates (1-4), stator tie rods (1-5), and stator support plates (1-3) for ventilation. The stator core (1-1) and stator support plates (1-3) are spaced apart. The sub-bracing rod (1-5) and end pressure plate (1-4) are fixed together, and the winding (1-2) is embedded in the stator core (1-1); the motor rotor (2) consists of a rotating shaft (2-1), a bracket (2-3), a magnetic pole box (2-4), a permanent magnet (2-5), a rotor bracing rod (2-8), and rotor support plates (2-6) aligned with the stator support plates (1-3). Radial ventilation holes (2-9) are provided on the bracket (2-3), and the bracket (2-3) is a spoke type. It can be opened in an intermittent or through-type manner. The permanent magnet (2-5) and the stator core (1-1) are aligned. The rotor support (2-6) and the magnetic pole box (2-4) are alternately distributed. The magnetic pole box (2-4) and the rotor support (2-6) are fixed by a tie rod. The magnetic pole box (2-4) is circumferentially limited by a pressure block (2-7). The sealing assembly is installed on the rotating shaft (2-1) to form the permanent magnet motor rotor (2). The spokes and ventilation holes of the bracket (2-3) are the ventilation structure of the rotor.

2. The air-cooled permanent magnet motor device according to claim 1, characterized in that, The radial ventilation hole (2-9) is located at the dovetail protrusion of the bracket (2-3) and is on the same axial plane as the stator support plate (1-3).

3. The air-cooled permanent magnet motor device according to claim 2, characterized in that, The motor rotor (2) further includes a sealing assembly (2-2), which, together with the shaft (2-1), the drive end cover (3-1), the end housing (3-2), the middle housing (3-3), and the non-drive end cover (3-4), forms a sealed cavity.

4. The air-cooled permanent magnet motor device according to claim 1, characterized in that, The permanent magnet (2-5) and the magnetic pole box (2-4) are bonded together with adhesive, and the magnetic pole box (2-4) is connected to the bracket (2-3) by bolts.

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