CN215378647U

CN215378647U - Cooling structure of permanent magnet synchronous motor

Info

Publication number: CN215378647U
Application number: CN202120265068.8U
Authority: CN
Inventors: 杜一; 刘增玥; 罗会兵; 冯波; 蔺月萌; 杜鹏; 周伟
Original assignee: Chongqing Tsingshan Industrial Co Ltd
Current assignee: Chongqing Tsingshan Industrial Co Ltd
Priority date: 2021-01-31
Filing date: 2021-01-31
Publication date: 2021-12-31
Anticipated expiration: 2031-01-31

Abstract

The utility model discloses a permanent magnet synchronous motor cooling structure which comprises a liquid cooling device, wherein the liquid cooling device comprises a motor shell provided with a liquid cooling channel and an oil cooling device, the oil cooling device comprises a rotor shaft and an oil pipe, the rotor shaft penetrates through the motor shell, an oil outlet is formed in the circumferential surface of the rotor shaft, an oil cavity is further formed in the rotor shaft and extends along the axial direction of the rotor shaft, at least one part of the oil pipe is located in the oil cavity, the outlet end of the oil pipe is far away from the oil outlet, and a gap for cooling oil to flow through is formed between the oil pipe and the inner wall of the oil cavity. The utility model has the advantage of improving the heat dissipation efficiency.

Description

Cooling structure of permanent magnet synchronous motor

Technical Field

The utility model relates to the field of motors, in particular to a cooling structure of a permanent magnet synchronous motor.

Background

The automobile driving motor has large power and large heat productivity. The existing new energy vehicles in China, particularly hybrid vehicles, are mostly reformed through traditional fuel vehicles. Due to the limitation of a whole vehicle circulation heat dissipation system, the cooling condition of the motor is limited, and the improvement of the motor power in a limited installation space is limited.

For the cooling mode of new energy vehicles, a water cooling mode is basically adopted at present, a motor shell consists of an inner cooling sleeve and an outer cooling sleeve, parts such as a stator and a rotor of the motor are installed inside the inner cooling sleeve, and a water flow channel for cooling water to flow through is formed between the inner cooling sleeve and the outer cooling sleeve. The heat generated by the motor during operation is transferred to the inner cooling jacket in a heat transfer mode, and is taken away by the cooling water flowing through the water flow channel.

Because the power of the motor used by the new energy automobile is improved, the heat generated by the motor after the power is improved when the motor works is increased, and the heat generated by the rotor assembly is positioned in the middle of the whole motor and can be transferred to the inner cooling sleeve only through the stator in the single water cooling mode, the heat transfer efficiency is limited, so that the heat dissipation efficiency of the cooling structure on the motor cannot meet the requirement of the power-improved motor, and the motor is easy to damage due to overhigh working temperature under the condition of not obtaining effective heat dissipation.

Disclosure of Invention

The utility model provides a permanent magnet synchronous motor cooling structure capable of improving the heat dissipation efficiency.

The technical scheme for realizing the purpose is as follows:

the utility model provides a PMSM cooling structure, includes liquid cooling device, and liquid cooling device still includes oil cooling device including the motor casing that is equipped with the liquid cooling passageway, and oil cooling device includes rotor shaft, oil pipe, and the rotor shaft passes through the motor casing, is equipped with the oil-out on rotor shaft's global, the epaxial oil pocket that still is equipped with of rotor, the oil pocket extends along the axial of rotor shaft, at least partly of oil pipe is located the oil pocket, and oil pipe's exit end is kept away from the oil-out is formed with the clearance that supplies cooling oil to flow between the inner wall of oil pipe and oil pocket.

The utility model has the following advantages:

1. the motor is radiated by comprehensively utilizing three modes of water cooling, air cooling and oil cooling, and the heat exchange capacity is strong.

2. Simple structure and easy realization. The device is widely applicable to automobile electric drive power assemblies.

3. The air cooling and oil cooling heat dissipation capability is physically adjusted along with the rotating speed of the motor.

4. The space structure arrangement characteristics of the current universal permanent magnet synchronous motor are met.

In a word, the utility model has strong heat dissipation capability, and particularly provides a solution for solving the problem of insufficient heat dissipation of the existing products.

Drawings

Fig. 1 and 2 are schematic views of a cooling structure of a permanent magnet synchronous motor of the present invention;

FIG. 3 is a schematic view of a motor housing;

FIG. 4 is a schematic structural view of a first turbine blade set;

FIG. 5 is a schematic view of a turbine blade in a first turbine blade set;

FIG. 6 is a schematic structural view of a second turbine blade set;

FIG. 7 is a schematic view of a turbine blade in a second turbine blade set;

FIG. 8 is a schematic view of an oil cooling apparatus;

FIG. 9 is a schematic structural view of an oil pipe;

FIG. 10 is a schematic view of a rotor shaft configuration;

reference numbers in the drawings:

11 is a water cooling device; 12 is an air cooling device; and 13 is an oil cooling device.

21 is a motor shell; 22 is a motor stator; 23 is a motor rotor; 24 is a first turbine blade set; 25 is a second turbine blade set; 26 is a rotor shaft; 27 is a supporting oil pipe; 28 is a plug.

31 is a cooling circulation water channel; 32 is a liquid inlet; and 33 is a liquid outlet.

41 is an air inlet; 42 is a turbine blade; 43 is a rear end fixing plate; 44 is a front end fixing plate; and 45 is a mounting port.

Support plates 91 and axial positioning end plates 92.

101 is an oil outlet; an oil chamber 102 and a positioning portion 103.

Detailed Description

The present invention will be described with reference to fig. 1 to 10.

The cooling structure of the permanent magnet synchronous motor of the present invention includes a liquid cooling device 11 and an oil cooling device 13, and the details of each part and the relationship between them will be described below.

The liquid cooling device 11 includes a motor housing 21 having a liquid cooling passage 31, the front and rear ends of the motor housing 21 are provided with sealing surfaces, the liquid cooling passage 31 is provided on the circumferential surface of the motor housing 21, and the cooling liquid in the present invention is preferably water. The motor housing 21 is provided with a liquid inlet 32 and a liquid outlet 33, when cooling liquid enters the liquid cooling channel 31 through the liquid inlet 32, circulation is formed on the motor housing 21 through the liquid cooling channel 31, heat is transferred through the motor housing 21, and the cooling liquid absorbs heat on the iron core of the motor stator 22 and the motor stator winding to dissipate heat of the iron core of the motor stator 22 and the motor stator winding.

The oil cooling device 13 dissipates heat from the motor rotor shaft 26 and the motor rotor core by heat transfer from the rotor shaft 26 by circulation of cooling oil supplied from the outside. The oil cooling device 13 comprises a rotor shaft 26 and an oil pipe 27, the rotor shaft 26 penetrates through the motor housing 21, an oil outlet 101 is arranged on the circumferential surface of the rotor shaft 26, an oil chamber 102 is further arranged on the rotor shaft 26, the oil chamber 102 extends along the axial direction of the rotor shaft 26, at least one part of the oil pipe 27 is located in the oil chamber 102, the outlet end of the oil pipe 27 is far away from the oil outlet 101, and a gap for cooling oil to flow through is formed between the oil pipe 27 and the inner wall of the oil chamber 102.

A plurality of support plates 91 and a positioning plate 92 are arranged on the circumferential surface of the oil pipe 27, the support plates 91 are matched with the inner wall of the oil chamber 102, an axial positioning part 103 is arranged in the oil chamber 102 on the rotor shaft 26, and the positioning plate 92 is matched with the positioning part 103.

The oil cooling device 13 performs heat transfer through the rotor shaft 26 by circulation of cooling oil supplied from the outside, and dissipates heat from the motor rotor shaft 26 and the motor rotor core. Therefore, the oil chamber 102 is provided on the rotor shaft 26, and after the oil pipe 27 is fitted in the oil chamber 102, the heat generated from the motor is absorbed from the middle part of the motor, so that the oil cooling device 13 is fitted to the inside and outside of the liquid cooling device 11, and the heat radiation efficiency of the motor is improved.

The oil chamber 102 penetrates through the rotor shaft 26 along the axial direction of the rotor shaft 26, the oil cooling device 13 further comprises a plug 28, and after the oil pipe 27 is inserted into the oil chamber 102, the plug 28 and the oil chamber 102 are matched to form a seal for one end of the oil chamber 102. Through a circulating oil passage formed by the oil cavity 102 in the rotor shaft 26, the oil pipe 27 and the plug 28, the electric drive assembly is used for actively supplying oil to the oil inlet, and when the motor operates, the cooling oil at the oil outlet 101 is thrown out due to centrifugal force generated inside the rotor to form pressure difference, so that oil circulation is formed.

The present invention further includes an air cooling device 12, the air cooling device 12 including: the first turbine blade group 24 is fixed at the rear end of the rotor shaft 26 and rotates along with the rotor shaft 26, the axial position of the first turbine blade group 24 is flush with the position of a winding wire outlet packet at the rear end of the stator core with the winding, the second turbine blade group 25 is fixed at the front end of the rotor shaft 26 and rotates along with the rotor shaft 26, and the axial position of the second turbine blade group 25 is flush with the position of the winding wire outlet packet at the front end of the stator core with the winding.

When the motor works in the forward direction, the air cooling device 12 forms directional airflow from the rear end of the motor to the rear end of the winding, the air gap, the front end of the winding and the front end of the motor, so that heat is dissipated from the motor stator 22 and the motor rotor 23. The air cooling device 12 can quickly disperse heat to avoid damage to certain parts caused by heat concentrated on the certain parts.

The first turbine blade group 24 and the second turbine blade group 25 both comprise turbine blades 42, a rear end fixing plate 43, a front end fixing plate 44 and a mounting portion 45 connected with a rotor shaft, an air inlet 41 is formed in the rear end fixing plate 43, the turbine blades 42 are located between the rear end fixing plate 43 and the front end fixing plate 44, the turbine blades 42 are fixed to the rear end fixing plate 43 and/or the front end fixing plate 44, the mounting portion 45 is fixed to the rear end fixing plate 43 and/or the front end fixing plate 44, the turbine blades 42 are located around the mounting portion 45, and the number of the turbine blades 42 is preferably 8.

After the first turbine blade group 24 and the second turbine blade group 25 are mounted on the rotor shaft 26, the turbine blades 42 of the first turbine blade group 24 and the second turbine blade group 25 have opposite rotation directions. When the turbine blade set rotates counterclockwise, the turbine blades 42 in the first turbine blade set 24 are protruded toward the wind, and an air flow from the wind inlet to the wind outlet is formed. When the turbine blade group rotates counterclockwise, the turbine blades 42 in the second turbine blade group 25 are recessed toward the wind, and airflow from the wind inlet to the wind outlet is formed.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and the patent scope of the present invention is not limited; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; in addition, the technical scheme of the utility model is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the utility model.

Claims

1. The utility model provides a permanent magnet synchronous motor cooling structure, includes liquid cooling device (11), liquid cooling device (11) is including motor casing (21) that are equipped with the liquid cooling passageway, its characterized in that, still includes oil cooling device (13), oil cooling device (13) are including rotor shaft (26), oil pipe (27), and motor casing (21) are passed in rotor shaft (26), are equipped with oil-out (101) on the global of rotor shaft (26), still are equipped with oil pocket (102) on rotor shaft (26), and oil pocket (102) are along the axial extension of rotor shaft (26), at least partly in oil pocket (102) of oil pipe (27), the exit end of oil pipe (27) is kept away from oil-out (101), is formed with the clearance that supplies cooling oil to flow between the inner wall of oil pipe (27) and oil pocket (102).

2. The cooling structure of the permanent magnet synchronous motor according to claim 1, wherein a plurality of support plates (91) and positioning plates (92) are arranged on the circumferential surface of the oil pipe (27), the support plates (91) are matched with the inner wall of the oil chamber (102), an axial positioning part is arranged in the oil chamber (102) on the rotor shaft (26), and the positioning plates (92) are matched with the positioning part.

3. The cooling structure of the permanent magnet synchronous motor according to claim 1, wherein the oil chamber (102) penetrates through the rotor shaft (26) along the axial direction of the rotor shaft (26), the oil cooling device (13) further comprises a plug (28), and after the oil pipe (27) is inserted into the oil chamber (102), the plug (28) is matched with the oil chamber (102) to seal one end of the oil chamber (102).

4. A cooling structure of a permanent magnet synchronous motor according to any one of claims 1 to 3, further comprising an air cooling device (12), wherein the air cooling device (12) comprises:

a first turbine blade group (24) fixed to the rear end of the rotor shaft (26) and rotating with the rotor shaft (26);

and a second turbine blade group (25) fixed to the front end of the rotor shaft (26) and rotating with the rotor shaft (26).

5. The cooling structure of the permanent magnet synchronous motor according to claim 4, wherein the first turbine blade set (24) and the second turbine blade set (25) each comprise a turbine blade (42), a rear end fixing plate (43), a front end fixing plate (44) and a mounting portion (45) connected with the rotor shaft, the rear end fixing plate (43) is provided with an air inlet (41), the turbine blade (42) is located between the rear end fixing plate (43) and the front end fixing plate (44), the turbine blade (42) is fixed with the rear end fixing plate (43) and/or the front end fixing plate (44), the mounting portion (45) is fixed with the rear end fixing plate (43) and/or the front end fixing plate (44), and the turbine blade (42) is located around the mounting portion (45).

6. The cooling structure of the permanent magnet synchronous motor according to claim 5, wherein the turbine blades (42) on the first turbine blade group (24) and the second turbine blade group (25) are oppositely rotated after the first turbine blade group (24) and the second turbine blade group (25) are installed on the rotor shaft (26).