An internal cooling structure for an electric machine

Abstract

The utility model discloses a motor internal cooling structure, including stator cooling fixed shell and rotor shell, the outside of stator cooling fixed shell is provided with stator coil in the circumference, and the inside of rotor shell is provided with rotor magnet yoke in the circumference, the both ends of stator cooling fixed shell and rotor shell are provided with rotary sealing assembly, the inside wall surface of rotor shell is provided with a plurality of drive blades, and the drive blade between every adjacent two is provided as air duct, the outside circumferential wall surface of stator cooling fixed shell is provided with guide groove, and the cooling medium is filled between rotor shell, rotary sealing assembly and stator cooling fixed shell, under the motor operating condition, the rotor shell rotates and makes its drive blade drive cooling medium circulate and flow in the both sides of motor interior. The utility model discloses a motor internal cooling structure, through the drive blade of the power cooperation setting of motor itself, forced cooling liquid flow, strengthen cooling effect, reduce energy consumption, improve the efficiency of electric price and pit overload capacity.

Description

Technical Field

[0001] This utility model relates to the field of motor cooling technology, and in particular to an internal cooling structure for a motor. Background Technology

[0002] Most existing motors use external cooling or internal coolant, with an external motor driving the coolant circulation to cool the motor's internal components. However, this method has the following drawbacks:

[0003] 1. External air cooling is inefficient and has weak overload resistance;

[0004] 2. Liquid cooling has a good effect, but it requires an external coolant to drive the pump, which increases equipment and energy consumption;

[0005] 3. Adding a separate drive mechanism results in a complex structure;

[0006] 4. External cooling drives are complex and have many potential points of failure; if one device fails, the system will stop working. Utility Model Content

[0007] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an internal cooling structure for an electric motor.

[0008] This utility model provides an internal cooling structure for an electric motor, comprising a stator cooling housing and a rotor housing sleeved on the outer circumferential side of the stator cooling housing; a stator coil is circumferentially arranged on the outer side of the stator cooling housing, and a rotor magnet yoke is circumferentially arranged on the inner side of the rotor housing and sleeved on the outer circumferential side of the stator coil; a rotating sealing assembly is provided at both ends of the stator cooling housing and the rotor housing; a plurality of drive blades are fixedly arranged at even intervals along the circumference on the inner wall of the rotor housing, and an air duct is provided between every two adjacent drive blades; a plurality of guide grooves are evenly spaced along the circumferential side of the outer circumferential wall of the stator cooling housing; a cooling medium is filled between the rotor housing, the rotating sealing assembly, and the stator cooling housing; when the motor is running, the rotor housing rotates, causing the drive blades on it to drive the cooling medium to circulate on both sides of the motor, carrying away the heat generated by the stator coil.

[0009] Furthermore, the rotating seal assembly includes a bearing and a sealing end plate; wherein,

[0010] The bearing is provided in two parts, which are symmetrically arranged at both ends between the stator cooling housing and the rotor housing to provide support between the rotor housing and the stator cooling housing and ensure that the rotor housing rotates smoothly.

[0011] Two sealing end plates are provided, which are symmetrically arranged at both ends of the stator cooling housing and the rotor housing and located outside the corresponding bearings to ensure that the cooling medium does not leak.

[0012] Furthermore, the spacing between two adjacent drive blades is set to 10–40 mm, and the angle of the drive blades is set to 15–45°.

[0013] Furthermore, the spacing between two adjacent guide grooves is set to 10-60 mm, and the groove width of the guide groove is set to 5-30 mm.

[0014] Furthermore, the two sides of the inner circumferential wall of the stator coil are connected to the outer circumferential wall of the stator cooling and fixing shell by a first retaining ring.

[0015] Furthermore, the two ends of the rotor magnet yoke are connected to the inner circumferential wall of the rotor housing by second retaining rings.

[0016] Furthermore, the cooling medium is a gas or a cooling liquid.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The internal cooling structure of this utility model for a motor uses blade-shaped drive blades set on the inner circumferential wall of the rotor housing. An air duct is set between every two adjacent drive blades, which works in conjunction with the guide groove set on the outer circumferential wall of the stator cooling housing. The air duct and the guide groove form a channel for the circulation of cooling medium. When the motor rotates, the rotor housing rotates, and the drive blades on it perform the function of blade driving, driving the cooling medium to circulate between the air duct and the guide groove. This facilitates the transfer of heat generated by the stator coil to all the housings of the motor, achieving more efficient cooling of the stator coil and rotor magnet yoke directly. It removes the heat generated by the stator coil, thereby preventing the stator coil from burning out due to heat accumulation. It also prevents the overheating of the stator coil from being conducted to the rotor magnet yoke, causing the rotor magnet yoke to demagnetize or lose magnetic force due to overheating, thus preventing motor damage or power reduction.

[0019] In summary, the technical solution of this application directly sets drive blades and air ducts on the rotor housing, and sets guide grooves on the stator cooling fixed shell. The air duct and the guide groove are the cooling medium circulation channel. The cooling medium is circulated by the motor itself, without the need to install a separate motor drive cooling structure. The stator coil and rotor magnet yoke are directly cooled. The motor and cooling drive are integrated and have the same lifespan and the same failure rate. The structure is simple and easy to process.

[0020] It should be understood that the content described in the utility model description section is not intended to limit the key or important features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model.

[0021] Other features of this invention will become readily apparent from the following description. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 A schematic diagram of the external appearance of an internal cooling structure for an electric motor provided in an embodiment of this utility model;

[0024] Figure 2 A schematic diagram of the cross-section of the internal cooling structure of the motor after assembly;

[0025] Figure 3 This is a schematic diagram of the rotor housing structure;

[0026] Figure 4 A schematic diagram of the structure of the stator cooling housing;

[0027] Figure 5 This is an exploded view of the internal cooling structure of the motor.

[0028] Figure 6 This is a cross-sectional view of the cooling medium circulating within the internal cooling structure of the motor.

[0029] The following are the labels in the diagram: 1. Rotor housing; 2. Rotor magnet yoke; 3. Drive blade; 4. Air duct; 5. Stator cooling housing; 6. Stator coil; 7. Guide groove; 8. First snap ring; 9. Second snap ring; 10. Bearing; 11. Sealing end plate. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0031] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Please refer to Figures 1-6The present invention provides an internal cooling structure for an electric motor. The electric motor is ring-shaped, and the cooling structure is located inside the electric motor. It includes a stator cooling housing 5 and a rotor housing 1 sleeved on the outer side of the stator cooling housing 5. A stator coil 6 is arranged on the outer circumferential side of the stator cooling housing 5, and a rotor magnet yoke 2 is arranged on the inner circumferential side of the rotor housing 1 and sleeved on the outer circumferential side of the stator coil 6.

[0033] In a preferred embodiment, the two sides of the inner circumferential wall of the stator coil 6 are connected to the outer circumferential wall of the stator cooling and fixing shell 5 by a first snap ring 8.

[0034] In a preferred embodiment, the two ends of the rotor magnet yoke 2 are connected to the inner circumferential wall of the rotor housing 1 by a second snap ring 9.

[0035] Among them, annular mounting grooves are provided on the inner circumferential wall of the rotor housing 1 and the outer circumferential wall of the stator cooling and fixing housing 5, respectively, corresponding to the first retaining ring 8 and the second retaining ring 9, so as to facilitate the first retaining ring 8 and the second retaining ring 9 to be assembled in the corresponding positions.

[0036] Several drive blades 3 are fixedly arranged at uniform intervals along the circumference on the inner wall of the rotor housing 1, and an air duct 4 is set between every two adjacent drive blades 3.

[0037] Figure 3 The shape of the drive blade 3 is for illustrative purposes only; the actual shape is designed based on the cooling medium and the operating speed range.

[0038] The cooling medium circulates between the air duct 4 and the guide groove 7 (see reference). Figure 6 , Figure 6 The arrows in the diagram indicate the direction of cooling medium circulation; the drive blades 3 and the air duct 4 are bidirectional structures, and can drive the cooling medium to circulate in both forward and reverse directions.

[0039] Several guide grooves 7 are evenly spaced along the circumferential direction on the outer circumferential wall of the stator cooling fixed shell 5, and a cooling medium is filled between the rotor shell 1, the rotating sealing assembly and the stator cooling fixed shell 5.

[0040] The air duct 4 and the guide groove 7 form a circulating flow channel for the cooling medium, thereby transferring the heat of the stator coil 6 to the stator cooling fixed shell 5, the rotor shell 1 and the sealing end plate 11, and then dissipating it into the outside air through the stator cooling fixed shell 5, the rotor shell 1 and the sealing end plate 11.

[0041] Rotary sealing assemblies are provided at both ends of the stator cooling housing 5 and the rotor housing 1 to ensure the rotation of the rotor housing 1 and prevent leakage of the cooling medium.

[0042] In a preferred embodiment, the rotary seal assembly includes a bearing 10 and a sealing end plate 11; wherein,

[0043] There are two bearings 10, which are symmetrically arranged at both ends between the stator cooling housing 5 and the rotor housing 1. They are used to provide support between the rotor housing 1 and the stator cooling housing 5 to ensure the smooth rotation of the rotor housing 1.

[0044] There are two sealing end plates 11. The two sealing end plates 11 are symmetrically arranged at both ends of the stator cooling fixed shell 5 and the rotor shell 1 and are located outside the corresponding bearing 10 to ensure that the cooling medium does not leak.

[0045] The sealing end plate 11 is fixedly connected to the stator cooling fixed shell 5 and rotatably connected to the rotor shell 1. An annular sealing ring is provided at the connection between the sealing end plate 11 and the rotor shell 1 to ensure that the cooling medium does not leak.

[0046] The stator cooling housing 5, the rotor housing 1, and the two sealing end plates 11 form an annular sealed cavity, and the cooling medium is filled inside the sealed cavity.

[0047] When the motor is running, the rotor housing 1 rotates, causing the drive blades 3 to drive the cooling medium to circulate on both sides inside the motor, carrying away the heat generated by the stator coil 6; that is, the cooling medium flows from one side of the air duct 4 to one side of the guide groove 7. Since the stator coil 6 and the rotor magnet yoke 2 are located between the guide groove 7 and the air duct 4, the cooling medium carries away the heat of the stator coil 6 and the rotor magnet yoke 2 and conducts it to the rotor housing 1, the stator cooling fixing shell 5 and the two sealing end plates 11.

[0048] In a preferred embodiment, the spacing between two adjacent drive blades 3 is set to 10-40 mm, and the angle of the drive blades 3 is set to 15-45°.

[0049] In a preferred embodiment, the spacing between two adjacent guide grooves 7 is set to 10-60 mm, and the groove width of the guide groove 7 is set to 5-30 mm.

[0050] In a preferred embodiment, the cooling medium is a gas or a cooling liquid, and the cooling liquid may be insulating cooling oil.

[0051] In a preferred embodiment, the stator cooling housing 5, the rotor housing 1, the rotor magnet yoke 2, the stator coil 6, the bearing 10, and the sealing end plate 11 are all coaxially arranged.

[0052] The working principle of this utility model:

[0053] When the motor rotates, the rotor housing 1 rotates, and the blade-shaped drive blades 3 on the rotor housing 3 function as blades, driving the cooling medium to circulate between the air duct 4 and the guide groove 7. During the circulation of the cooling medium between the air duct 4 and the guide groove 7, the cooling medium comes into full contact with the stator coil 6 and the rotor magnet yoke 2, continuously carrying away the heat from the stator coil 6 and the rotor magnet yoke 2, and conducting the heat from the stator coil 6 and the rotor magnet yoke 2 to the rotor housing 1, the stator cooling fixing shell 5 and the two sealing end plates 11, and then dissipating it into the outside air through the rotor housing 1, the stator cooling fixing shell 5 and the two sealing end plates 11. Because the circulation of the cooling medium can continuously carry away the heat generated by the stator coil 6, it avoids the stator coil 6 from accumulating heat and burning out, and also avoids the stator coil 6 from overheating and conducting it to the rotor magnet yoke 2, causing the rotor magnet yoke 2 to demagnetize or lose magnetic force due to overheating, thus preventing motor damage or power reduction.

[0054] The internal cooling mechanism of the motor in this application mainly optimizes the cooling structure by modifying the motor rotor housing 1 and stator cooling fixing housing 5. It strengthens the cooling effect, reduces energy consumption, and improves the efficiency and overload capacity of the motor by forcing the coolant to flow through the motor's own power.

[0055] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An internal cooling structure for an electric motor, characterized in that, The device includes a stator cooling housing and a rotor housing fitted around the stator cooling housing. A stator coil is circumferentially arranged on the outer side of the stator cooling housing, and a rotor magnet yoke is circumferentially arranged on the inner side of the rotor housing, fitted around the outer side of the stator coil. Rotary sealing assemblies are provided at both ends of the stator cooling housing and the rotor housing. A plurality of drive blades are fixedly arranged at even intervals along the circumference of the inner wall of the rotor housing, with an air duct between each pair of adjacent drive blades. A plurality of guide grooves are evenly spaced along the circumferential of the outer wall of the stator cooling housing. A cooling medium is filled between the rotor housing, the rotary sealing assembly, and the stator cooling housing. During motor operation, the rotor housing rotates, causing the drive blades to drive the cooling medium to circulate on both sides of the motor interior, carrying away the heat generated by the stator coils.

2. The internal cooling structure of the motor according to claim 1, characterized in that, The rotating seal assembly includes a bearing and a sealing end plate; wherein... The bearing is provided in two parts, which are symmetrically arranged at both ends between the stator cooling housing and the rotor housing to provide support between the rotor housing and the stator cooling housing and ensure that the rotor housing rotates smoothly. Two sealing end plates are provided, which are symmetrically arranged at both ends of the stator cooling housing and the rotor housing and located outside the corresponding bearings to ensure that the cooling medium does not leak.

3. The internal cooling structure of the motor according to claim 1, characterized in that, The spacing between two adjacent drive blades is set to 10–40 mm, and the angle of the drive blades is set to 15–45°.

4. The internal cooling structure of the motor according to claim 1, characterized in that, The spacing between two adjacent guide grooves is set to 10-60 mm, and the width of the guide groove is set to 5-30 mm.

5. The internal cooling structure of the motor according to claim 1, characterized in that, The two sides of the inner circumferential wall of the stator coil are connected to the outer circumferential wall of the stator cooling and fixing shell by a first retaining ring.

6. The internal cooling structure of the motor according to claim 1, characterized in that, The two ends of the rotor magnet yoke are connected to the inner circumferential wall of the rotor housing by second retaining rings.

7. The internal cooling structure of the motor according to claim 1, characterized in that, The cooling medium is a gas or a cooling liquid.

Images