CN117614201A

CN117614201A - Air-cooled permanent magnet motor device

Info

Publication number: CN117614201A
Application number: CN202311574366.5A
Authority: CN
Inventors: 杨一帆; 黄振华; 王强; 张文; 肖阳
Original assignee: Wuhan Research Institute Of Marine Electric Propulsion No 712 Research Institute Of China Shipbuilding Corp
Current assignee: Wuhan Research Institute Of Marine Electric Propulsion No 712 Research Institute Of China Shipbuilding Corp
Priority date: 2023-11-23
Filing date: 2023-11-23
Publication date: 2024-02-27

Abstract

The invention discloses an air-cooled permanent magnet motor device, which comprises a motor stator, a motor rotor and a permanent magnet motor shell, wherein a cold air inlet and a hot air outlet are respectively arranged on an end part shell and a middle part shell; according to the invention, the cooling structure is optimized, the wind resistance of the wind path is reduced, the cooling uniformity is optimized, and a better cooling effect is provided for the rotor and the stator of the motor.

Description

Air-cooled permanent magnet motor device

Technical Field

The invention belongs to the field of motors, and particularly relates to an air-cooled permanent magnet motor device.

Background

With the enlargement and power of the motor apparatus, the heat dissipation problem of the motor apparatus is more prominent due to the power increase.

The traditional cooling mode is axial forced air cooling, the cooling channel is a stator-rotor air gap, the cooling area is an air gap surface of a stator and a rotor, the cooling direction is axial forced air from one end of the stator to the other end, the defects of large wind resistance, uneven heat dissipation and the like are overcome, and the large-scale development of the motor device is greatly limited.

Disclosure of Invention

The invention provides an air-cooled permanent magnet motor device which can reduce the heating value of a rotor part, optimize a cooling structure, reduce the wind resistance of a wind path, optimize the cooling uniformity and provide a better cooling effect.

The technical scheme adopted for solving the technical problems is as follows: an air-cooled permanent magnet motor device comprises a motor stator, a motor rotor and a permanent magnet motor shell consisting of a driving end cover, an end shell, a middle shell and a non-driving end cover; the end part shell and the middle part shell are respectively provided with a cold air inlet and a hot air outlet, the motor rotor is also provided with rotor radial ventilation holes, the cold air enters the two ends of the motor stator through the cold air inlet of the end part shell, a small part of the cold air flows to the motor stator from the air gap of the stator and the rotor, a large part of the cold air flows to the motor stator from the radial ventilation holes of the rotor, and the cold air flows out from the hot air outlet of the middle part shell and cools the motor device in a forced air cooling mode.

The motor stator of the air-cooled permanent magnet motor device is composed of a stator core, windings, end pressing plates, stator pull rods and stator supporting sheets for ventilation, wherein the stator core and the stator supporting sheets are distributed at intervals and fixed through the stator pull rods and the end pressing plates, and the windings are embedded in the stator core.

The motor rotor of the air-cooled permanent magnet motor device consists of a rotating shaft, a bracket, a magnetic pole box, a permanent magnet, a rotor pull rod and a rotor supporting piece aligned with a stator supporting piece, wherein a radial ventilation opening is arranged on the bracket, and the permanent magnet is aligned with a stator iron core.

The radial ventilation opening of the air-cooled permanent magnet motor device is positioned at the dovetail bulge of the bracket and is positioned on the same axial plane with the stator support sheet.

The motor rotor of the air-cooled permanent magnet motor device further comprises a sealing assembly, wherein the sealing assembly, the rotating shaft, the driving end cover, the end part shell, the middle shell and the non-driving end cover form a sealed cavity, external water is prevented from entering the shell, and meanwhile cooling air can be circulated according to a designed air path.

In the air-cooled permanent magnet motor device, a permanent magnet and a magnetic pole box are bonded through glue, and the magnetic pole box is connected with a bracket through a bolt.

In the air-cooled permanent magnet motor device, the bracket is a radial plate, the radial plate is required to avoid the installation position of the permanent magnet bolt, and the radial plate can be opened into an intermittent type or through-type on two sides.

The beneficial effects of the invention are as follows: the invention cools the motor device in a forced air cooling mode, wherein the cooling air path is used for cooling the rotor through the end part of the stator, the stator air gap channel and the rotor radial channel, then cooling the stator through the stator slot plate channel, and finally flowing from the stator core radial channel to the middle casing outlet, thereby realizing the cooling of the motor device.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is an air flow direction of the present invention;

FIG. 3 is a schematic diagram of the stator of the motor of the present invention;

FIG. 4 is a schematic view of the structure of the motor rotor of the present invention;

FIG. 5 illustrates stator and rotor spacer positions according to the present invention;

FIG. 6 is a profile view of a rotor blade according to the present invention;

the stator and rotor strut positions specifically contemplated in FIG. 7

FIG. 8 is a schematic view of the structure of the rotor vent and compacts of the present invention;

FIG. 9 is a schematic view of the structure of the rotor frame of the present invention;

FIG. 10 is a schematic view of the structure of the web at the rotor vents of the present invention.

The reference numerals are as follows: 1-motor stator, 1-stator core, 1-2-winding, 1-3-stator support piece, 1-4-end pressing plate, 1-5-stator pull rod, 2-motor rotor, 2-1-rotating shaft, 2-sealing component, 2-3-bracket, 2-4-magnetic pole box, 2-5-permanent magnet, 2-6-rotor support piece, 2-7-pressing block, 2-8-rotor pull rod, 2-9-rotor radial ventilation hole, 3-permanent magnet motor shell, 3-1-driving end cover, 3-2-end shell, 3-middle shell and 3-4-non-driving end cover.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. For example, although the various components in the figures are drawn to a particular scale, these scale relationships are merely exemplary and may be adjusted as needed by one skilled in the art to suit a particular application.

It should be noted that, in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate directions or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured or operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected inside two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

According to one example of the present invention, referring to fig. 1, an air-cooled permanent magnet motor apparatus includes a motor stator 1, a motor rotor 2, and a permanent magnet motor housing 3. The motor stator 1 is arranged on the permanent magnet motor shell 3, the motor rotor 2 and the motor stator 1 are assembled, and finally, the end cover is arranged to form the permanent magnet motor device.

The motor stator 1 consists of a stator core 1-1, a winding 1-2, an end pressing plate 1-4, a stator pull rod 1-5 and stator supporting sheets 1-3 used for ventilation, wherein the stator core 1-1 and the stator supporting sheets 1-3 are distributed at intervals, the winding 1-2 is embedded in the stator core 1-1 through the stator pull rod 1-5 and the end pressing plate 1-4, the stator supporting sheets 1-3 are of a ventilation structure of a stator, the height of each supporting sheet is suggested to be 6-10 mm for ensuring the fluidity of air, the installation of each supporting sheet is suggested to be 120-150 degrees, and the angle of each supporting sheet is suggested to be 120-150 degrees as shown in fig. 3.

The motor rotor 2 consists of a rotating shaft 2-1, a bracket 2-3, magnetic pole boxes 2-4, permanent magnets 2-5, a rotor pull rod 2-8 and rotor support sheets 2-6 aligned with the stator support sheets 1-3, wherein the rotating shaft 2-1 is connected with the bracket 2-3, the permanent magnets 2-5 are connected with the magnetic pole boxes 2-4 first, the magnetic pole boxes 2-4 are arranged on the rotor bracket 2-3, the rotor support sheets 2-6 and the magnetic pole boxes 2-4 are alternately distributed, the magnetic pole boxes 2-4 and the rotor support sheets 2-6 are fixed through the pull rod, a pressing block 2-7 can be added in the circumferential direction of the magnetic pole boxes 2-4 for limiting, and a sealing group is arranged on the rotating shaft 2-1 to form a ventilation structure of the permanent magnet motor rotor 2, a radial plate of the bracket 2-3 and a ventilation hole site rotor.

As shown in fig. 4. The bracket 2-3 is provided with a radial ventilation opening, and the permanent magnet 2-5 is aligned with the stator core 1-1; the thickness of both the rotor support pieces 2-6 and the stator support pieces 1-3 is the same as shown in fig. 5. The rotor support sheet 2-6 should have better strength, and can be designed into a bracket 2-3 or a solid body, as shown in fig. 6. Considering that the axial movement of the rotating shaft 2-1 causes the electromagnetic field to change, each section of permanent magnet 2-5 is increased by 0.5-1 mm at two ends, and the thickness of the rotor supporting sheet 2-6 is correspondingly reduced by 1-2 mm, as shown in fig. 7. In particular, the magnets may not be segmented or the magnets may fill the position of the rotor support plates 2-6.

The permanent magnet motor shell 3 consists of a driving end cover 3-1, an end shell 3-2, a middle shell 3-3 and a non-driving end cover 3-4. The end part shell 3-2 and the middle part shell 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 vent holes 2-9, the cold air enters the two ends of the motor stator 1 through the cold air inlet of the end part shell 3-2, a small part flows into the motor stator 1 from the stator-rotor air gap, a large part flows into the motor stator 1 from the rotor radial vent holes 2-9, flows out from the hot air outlet of the middle part shell 3-3, cools the rotor through the stator end part, the stator air gap channel and the rotor radial channel, cools the stator through the stator slot plate channel, and finally flows to the middle part shell outlet from the stator core 1-1 radial channel, so that forced air cooling is realized, as shown in figure 2.

The permanent magnet motor shell 3 is distributed left and right, the end shell 3-2 is an air inlet, the middle shell 3-3 is an air outlet, the driving end cover 3-1, the end shell 3-2, the middle shell 3-3, the non-driving end cover 3-4, the rotating shaft 2-1 and the sealing component 2-2 form a sealed cavity, external water is prevented from entering the shell, and meanwhile cooling air can be circulated according to a designed air path.

The radial ventilation opening is positioned at the dovetail bulge of the bracket 2-3 and is positioned on the same axial plane with the stator support sheet 1-3. The radial vent holes may be circular or rectangular in shape, as shown in fig. 8, for processing.

The permanent magnet 2-5 and the magnetic pole box 2-4 are bonded through glue, the magnetic pole box 2-4 is connected with the bracket 2-3 through bolts, the magnetic pole box 2-4 can also press the block 2-7 for limiting, but the block 2-7 should not block the position of the radial vent hole, as shown in fig. 8.

The bracket 2-3 is of a spoke plate type, the spoke plate should avoid the installation position of the permanent magnet 2-5 bolts, so that the installation and maintenance of the bolts are facilitated, and meanwhile, the air circulation of the rotor air channel is increased when the bracket 2-3 rotates, as shown in fig. 9. In particular, when the radial ventilation holes are blocked by the web to avoid the installation position of the permanent magnet 2-5 bolts, the web can be opened into an intermittent or two-sided through type, as shown in fig. 10, so as to ensure the uniformity of the radial ventilation of the rotor

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

Mainly, the permanent magnet motor device is cooled by forced air cooling. The cooling air path of the air-cooled permanent magnet motor device is to cool the rotor through the end part of the stator, the stator air gap channel and the rotor radial channel by air inlet from the end part shell 3-2, then cool the stator through the stator slot plate channel, and finally flow from the stator core 1-1 radial channel to the middle shell outlet as shown in fig. 2.

In particular, heat is dissipated by convection between the structural member and the water. If the air-cooled permanent magnet motor device is soaked in water, the stator of the motor device is thermally conducted to the outer surface of the shell, and the outer surface of the shell can dissipate heat through convection with water; the rotor of the motor device is thermally conducted to the outer surface of the rotating shaft 2-1, and heat is dissipated by convection with water.

The above examples merely illustrate the principles of the present invention and its effectiveness, and examples of partial use, and other embodiments of the dimensions and forms of the rotor support plates 2-6, the dimensions and forms of the stator support plates 1-3, the forms of the press blocks 2-7, etc. should be within the scope of this patent, and it is within the scope of this patent that those skilled in the art may make several variations and modifications without departing from the inventive concept.

Claims

1. An air-cooled permanent magnet motor device, which is characterized in that: the permanent magnet motor comprises a motor stator (1), a motor rotor (2) and a permanent magnet motor shell (3) consisting of a driving end cover (3-1), an end shell (3-2), a middle shell (3-3) and a non-driving end cover (3-4); the motor is characterized in that a cooling air inlet and a hot air outlet are respectively arranged on the end part shell (3-2) and the middle part shell (3-3), a rotor radial vent hole (2-9) is arranged on the motor rotor (2), cooling air enters two ends of the motor stator (1) through the cooling air inlet, part of cooling air flows into the motor stator (1) from an air gap of the stator and the rotor, part of cooling air flows into the motor stator (1) from the rotor radial vent hole (2-9), and part of cooling air flows out from the hot air outlet, so that the motor is cooled.

2. An air-cooled permanent magnet motor device according to claim 1, wherein the motor stator (1) comprises a stator core (1-1), windings (1-2), end pressing plates (1-4), stator pull rods (1-5) and stator supporting sheets (1-3) for ventilation, the stator core (1-1) and the stator supporting sheets (1-3) are distributed at intervals, the windings (1-2) are fixed through the stator pull rods (1-5) and the end pressing plates (1-4), and the windings (1-2) are embedded in the stator core (1-1).

3. An air-cooled permanent magnet motor device according to claim 2, wherein the motor rotor (2) is composed of a rotating shaft (2-1), a bracket (2-3), a magnetic pole box (2-4), a permanent magnet (2-5), a rotor pull rod (2-8) and a rotor support sheet (2-6) aligned with the stator support sheet (1-3), a radial ventilation opening is arranged on the bracket (2-3), and the permanent magnet (2-5) is aligned with the stator core (1-1).

4. An air-cooled permanent magnet motor device according to claim 1, 2 or 3, wherein the radial ventilation openings are located at dovetail protrusions of the bracket (2-3) and located on the same axial plane with the stator support sheets (1-3).

5. An air-cooled permanent magnet motor device according to claim 4, wherein the motor rotor (2) further comprises a sealing assembly (2-2), and the sealing assembly (2-2), the rotating shaft (2-1), the driving end cover (3-1), the end housing (3-2), the middle housing (3-3) and the non-driving end cover (3-4) form a sealed cavity.

6. An air-cooled permanent magnet motor device according to claim 5, wherein the permanent magnet (2-5) is bonded to the magnetic pole box (2-4) by glue, and the magnetic pole box (2-4) is connected to the bracket (2-3) by bolts.

7. An air-cooled permanent magnet motor device according to claim 6, wherein the support (2-3) is a web, and the web can be opened into a discontinuous type or a two-sided through type.