CN220915093U

CN220915093U - Inner rotor oil cooling motor

Info

Publication number: CN220915093U
Application number: CN202322415750.2U
Authority: CN
Inventors: 周德南; 李国栋
Original assignee: Houhua Tianjin Power Technology Co ltd
Current assignee: Houhua Tianjin Power Technology Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-05-07
Anticipated expiration: 2033-09-06

Abstract

The application provides an inner rotor oil-cooled motor, which comprises a shell, a stator core, a motor shaft, a rotor core and a side cover, wherein a circle of stator core is fixedly arranged on the inner circumference of the shell, and a Hall sensor is arranged on one axial side of the stator core; a motor shaft is coaxially arranged in the machine shell, a rotor core is fixedly arranged on the motor shaft in the machine shell, a gap is reserved between the rotor core and the stator core, side covers are respectively arranged at two axial ends of the machine shell, the side covers and the machine shell are encircled to form a closed motor inner cavity space, liquid cooling medium is filled in the motor inner cavity space, and the liquid cooling medium is settled at the bottom of the motor inner cavity space. The inner rotor oil-cooled motor adopts the cooling liquid or the cooling oil to improve the heat dissipation effect, rapidly derives the heat, enables a small amount of liquid to form active and efficient heat dissipation medium, and improves the heat dissipation effect, thereby improving the tolerance and the service life of the Hall.

Description

Inner rotor oil cooling motor

Technical Field

The application belongs to the field of motors, relates to a motor of a three-wheeled electric vehicle, and particularly relates to an inner rotor oil-cooled motor.

Background

The existing motor adopted by the three-wheeled electric vehicle is usually an inner rotor permanent magnet motor, particularly a motor of a freight tricycle, the phenomenon that a Hall is easy to burn is common, and the analysis is that the phenomenon is mainly due to the fact that an improper load is too large in the driving process, the current is too large, the temperature rise is too high, particularly in long-time driving, the heat dissipation and temperature reduction efficiency is low, the service life of a part is shortened, and even the Hall is burnt to cause motor faults.

Disclosure of Invention

Based on the problems of the prior art, the application provides the inner rotor oil-cooled motor, which can avoid the problem that the Hall is easy to burn and provides a more stable and reliable motor product.

An inner rotor oil-cooled motor comprises a shell, a stator core, a motor shaft, a rotor core and a side cover, wherein a circle of stator core is fixedly arranged on the inner circumference of the shell, and a Hall sensor is arranged on one axial side of the stator core; the motor shaft is coaxially arranged in the shell, the rotor core is fixedly arranged on the motor shaft in the shell, a gap is reserved between the rotor core and the stator core, side covers are respectively arranged at two axial ends of the shell, and the side covers and the shell surround to form a closed motor inner cavity space, and the motor is characterized in that: the liquid cooling medium is injected into the motor inner cavity space, and the liquid cooling medium is settled at the bottom of the motor inner cavity space.

Through adopting above-mentioned technical scheme, annotate in the motor inner chamber space and have liquid cooling medium, liquid cooling medium submergence stator core's lower tip, derive heat fast, improve the radiating effect for the motor keeps the well low temperature state in the operation in-process, and liquid cooling medium selects lower liquid level to avoid too much liquid also can form the resistance in the motor is inside, also practices thrift liquid cooling medium's cost moreover, and most importantly is the radiating effect certainly.

Preferably, an impeller is mounted on the motor shaft on the side corresponding to the hall sensor, and the outer edge of the impeller can be immersed under the liquid level of the liquid cooling medium.

Through adopting above-mentioned technical scheme, the impeller can be rotatory along with the motor shaft, drags for liquid coolant, spills on the hall sensor of top, makes it keep lower temperature work, drives the coolant liquid of bottom with the blade, through the relay of middle blade to make a small amount of liquid form active, efficient cooling medium, reach the radiating effect of hydraulic turbine blade.

Preferably, impellers are fixedly arranged on motor shafts on two sides of the axial direction of the rotor core, and the outer edges of the impellers can be immersed under the liquid level of the liquid cooling medium.

Through adopting above-mentioned technical scheme, both sides impeller can drag for liquid cooling medium respectively from rotor core both sides and shed to upper portion part, dispel the heat to motor internal device.

Preferably, the impeller comprises a mounting ring, limiting teeth and blades, the mounting ring is of a cylindrical structure with the inner diameter matched with that of a motor shaft, a plurality of blades are uniformly arranged on the periphery of the mounting ring, the blades are of a sheet-shaped structure perpendicular to the rotating direction, and hook plates are arranged at the outer ends of the blades.

Through adopting above-mentioned technical scheme, the blade of corner formula design of both sides can assist the blade to take up more liquid cooling medium, throws the liquid around to heat transfer to shell and end cover in the motor fast, realized efficient heat dissipation.

Preferably, reinforcing ribs are arranged between adjacent blades on one side of the mounting ring.

Through adopting above-mentioned technical scheme, the setting of strengthening rib promotes the structural strength of single thin blade, guarantees life.

Preferably, a circle of sealant is arranged at the combination position of the outer edge of the side cover and the shell, and the sealant is arranged at the position where the outgoing line passes through the shell.

Preferably, the two ends of the motor shaft respectively penetrate through shaft holes arranged at the centers of the side covers at the two ends, a bearing is arranged in the shaft holes in a limiting mode, and the bearing is provided with a sealing end cover.

Preferably, an oil filling port is reserved between the side cover at one end and the motor shaft, and a circle of oil seal structure is arranged between the side cover corresponding to the inner side of the oil filling port and the motor shaft in a limiting and abutting manner.

Through adopting above-mentioned technical scheme, this structural design guarantees through multiple sealing measure that motor inner chamber coolant liquid can not leak oil, has effectively solved the problem of traditional oil cooling motor oil leak, has ensured reliability and the long-life of product.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The inner rotor oil-cooled motor adopts cooling liquid or cooling oil to improve the heat dissipation effect, so that the motor can operate in a medium-low temperature state. The design effectively reduces the temperature rise of the motor, thereby improving the tolerance and the service life of the Hall. Compared with the traditional inner rotor permanent magnet motor, the technology can avoid the problem that the Hall is easy to burn, and provides a more stable and reliable motor product.

2. The application has the advantages of excellent heat dissipation effect, strong tolerance and long service life, and innovations comprise a cooling liquid heat dissipation technology, structural design improvement and an oil leakage prevention sealing scheme, so that the product has differential competitive advantages and wider application prospect in the market.

Drawings

Fig. 1 is a schematic view (partially cut-away) of the overall structure of the present application.

Fig. 2 is a schematic perspective view of an impeller.

Fig. 3 is a schematic perspective view of another impeller.

Description of the drawings: 1. a housing; 2. a stator core; 3. a lead-out wire; 4. a hall sensor; 5. magnetic steel; 6. a rotor core; 7. an impeller; 71. a mounting ring; 72. a blade; 73. a hook plate; 74. internal teeth; 75. reinforcing ribs; 8. a motor shaft; 9. an oil seal structure; 10. a bearing; 11. a side cover;

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings. The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship described in the drawings is for illustrative purposes only.

Referring to the drawings, an inner rotor oil-cooled motor comprises a casing 1, a side cover 11, a stator core 2, a rotor core 6, magnetic steel 5, a motor shaft 8 and a liquid cooling medium, wherein the casing 1 is of a cylindrical structure, a circle of stator core 2 is fixedly arranged on the inner circumference of the casing 1, and the stator core 2 is externally connected with a power supply through an outgoing line 3; a motor shaft 8 is coaxially arranged in the machine shell 1, a rotor core 6 is fixedly arranged on the motor shaft 8 in the machine shell 1, a whole circle of magnetic steel 5 is fixedly arranged on the outer circumference of the rotor core 6, and the magnetic steel 5 is a permanent magnet and can continuously generate magnetic force lines; when the stator core 2 is electrified, current is generated to cut magnetic force lines so as to generate driving force to drive the motor shaft 8 to rotate;

A plurality of hall sensors 4 are arranged on one side of the stator core 2, and three hall sensors 4 are continuously arranged at intervals in the embodiment, so that the magnetic field and the change thereof are detected in real time; when the motor works, the electromagnetic field changes, and the temperature of the Hall sensor 4 rises.

The two axial ends of the shell 1 are respectively provided with a side cover 11, the side covers 11 and the shell 1 are surrounded to form a closed motor inner cavity space, the two ends of the motor shaft 8 respectively pass through shaft holes arranged at the centers of the side covers 11 at the two ends, and bearings 10 are arranged in the side covers 11 at the positions of the shaft holes to ensure that the motor shaft 8 and the side covers 11 can flexibly rotate relatively; the bearings 10 selected in this embodiment all include a sealing end cover structure, and the sealing end cover can ensure the sealing performance of the positions of the bearings 10.

The liquid cooling medium is filled in the inner cavity space of the motor, and adopts cooling liquid or cooling oil to improve the heat dissipation effect, so that the motor is kept in a medium-low temperature state in the operation process. In general, the liquid cooling medium is injected into 100 milliliters, and the liquid cooling medium is settled at the bottom of the shell and the stator. The lowest liquid level of the liquid cooling medium can submerge the lower part of the stator core, and the maximum liquid level of the liquid cooling medium is arranged at about one third of the space in the inner cavity of the motor, so that the phenomenon that the internal pressure generated by the expansion of the medium is influenced by the normal operation of the motor due to the temperature rise is prevented.

Because the cooling liquid in the motor inner cavity space is settled at the bottom of the stator when the motor runs, the cooling effect cannot be effectively reduced, impellers 7 are respectively arranged on motor shafts 8 on two sides of a rotor core 6, and the impellers 7 are driven by the motor shafts 8 to rotate, so that the cooling liquid at the bottom is fished up to move to the upper part, and is sprayed onto parts such as a Hall sensor 4, an upper stator core 2, a side cover 11 and the like, and in order to further enhance the heat dissipation effect, the heat in the motor is rapidly brought to a motor shell 11 and end covers at two ends to dissipate heat.

The structure of the impeller 7 is shown in the drawing, and comprises a mounting ring 71, limiting teeth and blades 72, wherein the mounting ring 71 is of a cylindrical structure with the inner diameter matched with that of the motor shaft 8, the mounting ring 71 is internally provided with the limiting teeth, and the limiting teeth are used for limiting and being arranged in corresponding limiting grooves on the motor shaft 8, so that the radial positions of the impeller 7 and the motor shaft 8 are fixed; the periphery of collar 71 evenly is provided with a plurality of blades 72, and blade 72 is perpendicular to the sheet structure of direction of rotation, guarantees to stir efficiency to liquid cooling medium in the rotation, is provided with the hook plate 73 at the outer end of blade 72, and hook plate 73 can assist blade 72 to take more liquid cooling medium.

Reinforcing ribs 75 are provided between adjacent blades 72 on the side adjacent to the mounting ring 71, so that the strength of the blades 72 is ensured.

The specific structure of the impeller 7 is not limited, a plurality of bends can be arranged in the middle of the blades 72, the driving capability of the liquid cooling medium is improved, and the impeller 7 and the motor shaft 8 can be connected by keys.

The size of the impeller 7 is designed according to the size of the actual product, and the specific blade 72 size is not limited.

In order to prevent leakage of internal cooling liquid or cooling oil, a circle of sealant is arranged at the combination position of the outer edges of the side covers 11 at the two ends and the shell 1 to ensure the sealing performance; the position where the outgoing line 3 passes through the shell 1 is provided with sealant for sealing, so that the cooling oil is prevented from leaking from the gap of the channel.

In order to be capable of injecting cooling liquid or cooling oil, an oil filling port is reserved between the side cover 11 at one end of the cooling liquid or cooling oil and the motor shaft 8, a circle of oil seal structure 9 is arranged on the inner side of the side cover 11 at the corresponding position of the oil filling port in a limiting and abutting mode, a bearing 10 is arranged in a shaft hole on the outer side of the side cover 11 corresponding to the oil filling port, the bearing 10 is provided with an outer seal of a seal end cover, and the oil seal structure 9 is sealed with the bearing 10 in a double-layer mode.

The side cover 11, the bearing 10 and the motor shaft 8 at the other end are sequentially and closely matched and installed, so that the tightness of the installation position is ensured, and the cooling oil is prevented from leaking from the bearing 10.

The above examples of the present utility model are only for the purpose of clearly illustrating the present utility model and are not to be construed as limiting the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. An inner rotor oil-cooled motor comprises a shell (1), a stator iron core (2), a motor shaft (8), a rotor iron core (6) and a side cover (11), wherein a circle of stator iron core (2) is fixedly arranged on the inner circumference of the shell (1), and a Hall sensor (4) is arranged on one axial side of the stator iron core (2); a motor shaft (8) is coaxially arranged in the casing (1), a rotor core (6) is fixedly arranged on the motor shaft (8) in the casing (1), a gap is reserved between the rotor core (6) and the stator core (2), side covers (11) are respectively arranged at two axial ends of the casing (1), and the side covers (11) and the casing (1) surround to form a closed motor inner cavity space, and the motor is characterized in that: the liquid cooling medium is injected into the motor inner cavity space, and the liquid cooling medium is settled at the bottom of the motor inner cavity space.

2. The inner rotor oil cooled motor of claim 1, wherein: an impeller (7) is arranged on a motor shaft (8) corresponding to one side of the Hall sensor (4), and the outer edge of the impeller (7) can be immersed under the liquid level of the liquid cooling medium.

3. The inner rotor oil cooled motor of claim 1, wherein: impellers (7) are fixedly arranged on motor shafts (8) on two axial sides of the rotor core (6), and the outer edges of the impellers (7) can be immersed into the liquid level of the liquid cooling medium.

4. An inner rotor oil cooled motor as claimed in claim 2 or 3, wherein: the impeller (7) comprises a mounting ring (71), limiting teeth and blades (72), wherein the mounting ring (71) is of a cylindrical structure with the inner diameter matched with that of a motor shaft (8), a plurality of blades (72) are uniformly arranged on the periphery of the mounting ring (71), the blades (72) are of a sheet-shaped structure perpendicular to the rotation direction, and hook plates (73) are arranged at the outer ends of the blades (72).

5. The inner rotor oil cooled motor of claim 4, wherein: reinforcing ribs (75) are arranged between adjacent blades (72) on one side close to the mounting ring (71).

6. The inner rotor oil cooled motor of claim 1, wherein: and a circle of sealant is arranged at the combination position of the outer edge of the side cover (11) and the shell, and the sealant is arranged at the position of the outgoing line (3) penetrating through the shell (1).

7. The inner rotor oil cooled motor of claim 1, wherein: the two ends of the motor shaft (8) respectively penetrate through shaft holes arranged at the centers of the two end edge covers (11), a bearing (10) is arranged in the shaft holes in a limiting mode, and the bearing (10) is provided with a sealing end cover.

8. The inner rotor oil cooled motor of claim 1, wherein: an oil filling port is reserved between the side cover (11) at one end and the motor shaft (8), and a circle of oil seal structure (9) is arranged between the side cover (11) corresponding to the inner side of the oil filling port and the motor shaft (8) in a limiting and abutting mode.