Liquid-cooled permanent magnet motor

Abstract

The liquid-cooled permanent magnet motor comprises a shell, a stator, a rotor and an end cover, the stator is arranged on the inner wall of the shell through a positioning assembly, the rotor is rotatably arranged in the axis direction of the stator, the end cover is detachably arranged at the position of an opening in the rear side of the shell, a cooling cavity is formed in the shell, and the stator is arranged in the cooling cavity. The cooling cavity covers the outer side of the stator, a liquid inlet and a liquid outlet are formed in the two sides of the outer wall of the shell located above the cooling cavity respectively, and the liquid inlet and the liquid outlet are communicated with the two ends of the cooling cavity respectively. According to the utility model, through the cooling cavity, the liquid inlet, the liquid outlet and other structures arranged in the housing, heat generated when the motor works is transmitted to the cooling liquid, thereby realizing heat radiation of the motor, no structures such as a heat radiation fan and a fan cover are needed, the motor structure is simplified, the size of the whole machine is reduced, the fully-enclosed design of the motor is realized, and the service life of the motor is prolonged. The dustproof and waterproof problems of the motor can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a liquid-cooled permanent magnet motor. Background Technology

[0002] A permanent magnet motor is a synchronous motor that uses permanent magnets to generate a magnetic field. The rotor speed is synchronized with the current frequency of the stator windings. A permanent magnet motor typically consists of a stator, rotor, and end covers, and uses an air-cooled structure for heat dissipation. For example, patent CN221380725U discloses an intelligent air-cooled permanent magnet synchronous motor with a fan mounting base at the top of the stator assembly. An external cooling fan motor is mounted on top of the fan mounting base; to facilitate heat dissipation, fan blades are installed at the output end of the external cooling fan motor, and a fan cover is installed on top of the fan blades.

[0003] While this air-cooled heat dissipation structure can solve the motor's heat dissipation problem, it has at least the following two issues:

[0004] First, air-cooled heat dissipation requires ventilation openings that connect to the outside (such as heat dissipation holes on the fan cover) to ensure heat dissipation effect. However, this also brings problems of dust and water resistance. External dust or moisture can easily enter the motor through the ventilation openings, causing problems such as motor contamination, corrosion or short circuits.

[0005] Second, air-cooled heat dissipation requires additional structures such as fan mounting brackets, fans, and fan covers, which not only increases the overall size of the motor and limits its application scenarios, but also increases the structural complexity of the motor, the failure rate, and the later maintenance costs.

[0006] In conclusion, the existing heat dissipation structure of air-cooled permanent magnet motors needs improvement. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model discloses a liquid-cooled permanent magnet motor, including a housing, a stator, a rotor, and an end cover. The stator is set on the inner wall of the housing by a positioning component, and the rotor is rotatably set in the axial direction of the stator. The end cover is detachably set at the rear opening of the housing. A cooling chamber is provided inside the housing and covers the outside of the stator. A liquid inlet and a liquid outlet are respectively provided on both sides of the outer wall of the housing above the cooling chamber. The liquid inlet and the liquid outlet are respectively connected to the two ends of the cooling chamber. A wiring terminal is provided on the outer wall of the housing between the liquid inlet and the liquid outlet, and the wiring terminal is connected to the inside of the housing.

[0008] Furthermore, the positioning assembly includes a bracket and a pressure plate. The bracket is radially disposed inside the housing and located on both sides of the stator. The pressure plate is radially disposed inside the housing and located on the side near the end cover. The pressure plate abuts against the rear bracket.

[0009] Furthermore, a plurality of positioning posts are spaced apart along the circumference on one side end face of the bracket, and a plurality of slots are spaced apart along the circumference on the other side end face. A plurality of locking blocks are spaced apart along the circumference on the front inner wall of the housing, and the plurality of locking blocks are inserted into the plurality of slots in a corresponding manner. A plurality of positioning holes are spaced apart along the circumference on both sides end face of the stator, and the plurality of positioning posts are inserted into the plurality of positioning holes in a corresponding manner.

[0010] Furthermore, the pressure plate includes an annular plate and a central block. The central block is located at the center of the annular plate and is connected to the annular plate through multiple connecting arms. The outer circumferential wall of the annular plate is provided with external threads, and the inner wall of the housing is provided with internal threads near the rear support. The annular plate is connected inside the housing through the cooperation of the external and internal threads.

[0011] Furthermore, a pressure ring is provided on the front end face of the annular plate, and the pressure ring abuts against the end face of the rear support.

[0012] Furthermore, a tightening port is provided at the center of the central block.

[0013] Furthermore, an annular seat is provided on the inner end face of the end cap, the annular seat is disposed inside the rear opening of the housing, and a first sealing ring is provided between the annular seat and the inner wall of the housing.

[0014] Furthermore, a second sealing ring is provided between the end cap and the rear end face of the housing.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention uses a cooling chamber, liquid inlet, and liquid outlet inside the housing to transfer the heat generated by the motor during operation to the coolant, thereby achieving heat dissipation for the motor. It eliminates the need for cooling fans, shrouds, and other structures, simplifying the motor structure, reducing the overall size, and achieving a fully enclosed design for the motor, effectively solving the problems of dust and water resistance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2This is an exploded view of the structure of this utility model;

[0020] Figure 3 This is a radial structural cross-sectional view along the end faces where the inlet and outlet are located in this utility model;

[0021] Figure 4 This is a cross-sectional view of the overall axial structure of this utility model;

[0022] Figure 5 for Figure 4 Enlarged view of the local structure at point A in the middle.

[0023] Figure label:

[0024] 1-Housing, 2-Stator, 3-Rotor, 4-End cover, 5-Cooling chamber, 6-Inlet, 7-Outlet, 8-Terminal, 9-Bracket, 10-Pressure plate, 11-Positioning post, 12-Slot, 13-Block, 14-Positioning hole, 15-Annular plate, 16-Center block, 17-Connecting arm, 18-External thread, 19-Internal thread, 20-Pressure ring, 21-Tightening port, 22-Annular seat, 23-First sealing ring, 24-Second sealing ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1-2 As shown, the liquid-cooled permanent magnet motor in this embodiment includes a housing 1, a stator 2, a rotor 3, and an end cover 4. The stator 2 is mounted on the inner wall of the housing 1 by a positioning component, the rotor 3 is rotatably mounted in the axial direction of the stator 1, and the end cover 4 is detachably mounted at the rear opening of the housing 1.

[0029] like Figure 3 As shown, the housing 1 has a cooling cavity 5 inside, and the cooling cavity 5 covers the outside of the stator 2. The outer wall of the housing 1 above the cooling cavity 5 has a liquid inlet 6 and a liquid outlet 7 on both sides, respectively. The liquid inlet 6 and the liquid outlet 7 are respectively connected to the two ends of the cooling cavity 5.

[0030] Coolant can be injected into the cooling chamber 5 by pressure (e.g., a circulating pump) through the inlet 6. After the cooling chamber 5 is full, the coolant flows out from the outlet 7 and is injected back into the cooling chamber 5 after heat exchange, thus realizing the circulation of coolant. The heat generated by the motor during operation is conducted to the cooling chamber 5 through the stator 2 and the housing 1 and carried away by the coolant.

[0031] A wiring terminal 8 is provided on the outer wall of the housing 1 between the liquid inlet 6 and the liquid outlet 7. The wiring terminal 8 is connected to the inside of the housing 1, which facilitates wiring.

[0032] Combination Figure 2 and Figure 4 As shown, the positioning assembly includes a bracket 9 and a pressure plate 10. The bracket 9 is radially disposed inside the housing 1 and located on both sides of the stator 2. The pressure plate 10 is radially disposed inside the housing 1 and located on the side near the end cover 4. The pressure plate 10 abuts against the bracket 9 on the rear side.

[0033] On one side end face of the bracket 9, a plurality of positioning posts 11 are spaced apart along its circumference, and on the other side end face, a plurality of slots 12 are spaced apart along its circumference. On the front inner wall of the housing 1, a plurality of locking blocks 13 are spaced apart along its circumference, and the plurality of locking blocks 13 are inserted into the plurality of slots 12 in a corresponding manner. On both sides end faces of the stator 2, a plurality of positioning holes 14 are spaced apart along its circumference, and the plurality of positioning posts 11 are inserted into the plurality of positioning holes 14 in a corresponding manner.

[0034] The pressure plate 10 includes an annular plate 15 and a central block 16. The central block 16 is located at the center of the annular plate 15 and is connected to the annular plate 15 through multiple connecting arms 17. The outer circumferential wall of the annular plate 15 is provided with an external thread 18, and the inner wall of the housing 1 is provided with an internal thread 19 near the rear support 9. The annular plate 15 is connected inside the housing 1 through the cooperation of the external thread 18 and the internal thread 19.

[0035] A pressure ring 20 is provided on the front end face of the annular plate 15, and the pressure ring 20 abuts against the end face of the rear support 9; a tightening port 21 is provided at the center of the central block 16. The tightening port 21 can be a straight, cross, triangle, hexagonal or other structures, so as to facilitate the use of screwdrivers or wrenches to tighten the pressure plate 10 inside the housing 1.

[0036] When the pressure plate 10 is tightened, the pressure ring 20 presses tightly against the end face of the rear bracket 9, and the stator 2 is fixed inside the housing 1 by the cooperation of the two side slots 12 and the block 13, and the positioning post 11 and the positioning hole 14.

[0037] like Figure 5 As shown, an annular seat 22 is provided on the inner end face of the end cap 4. The annular seat 22 is located inside the rear opening of the housing 1, and a first sealing ring 23 is provided between the annular seat 22 and the inner wall of the housing 1. A second sealing ring 24 is provided between the end cap 4 and the rear end face of the housing 1.

[0038] When the end cap 4 is fixed at the rear opening of the housing 1, it exerts a squeezing effect on the first sealing ring 23 and the second sealing ring 24, thereby achieving a seal between the end cap 4 and the housing 1.

[0039] In summary, this utility model, through the cooling chamber 5, liquid inlet 6, and liquid outlet 7 structure set inside the housing 1, transfers the heat generated by the motor during operation to the coolant in the cooling chamber 5, and carries it away by the circulating coolant, thereby achieving heat dissipation of the motor. It eliminates the need for cooling fans, shrouds, and other structures, which simplifies the motor structure, reduces the overall size, and achieves a fully enclosed design for the motor, effectively solving the problems of dust and water resistance.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A liquid-cooled permanent magnet motor, comprising a housing, a stator, a rotor, and an end cover, wherein the stator is mounted on the inner wall of the housing via a positioning assembly, the rotor is rotatably mounted in the axial direction of the stator, and the end cover is detachably mounted at the rear opening of the housing, characterized in that: The housing has a cooling cavity inside, which covers the outside of the stator. The outer wall of the housing above the cooling cavity has a liquid inlet and a liquid outlet on both sides, which are respectively connected to the two ends of the cooling cavity. A wiring terminal is provided on the outer wall of the housing between the liquid inlet and the liquid outlet, and the wiring terminal is connected to the inside of the housing.

2. The liquid-cooled permanent magnet electric machine of claim 1, wherein: The positioning assembly includes a bracket and a pressure plate. The bracket is radially disposed inside the housing and located on both sides of the stator. The pressure plate is radially disposed inside the housing and located on the side near the end cover. The pressure plate abuts against the rear bracket.

3. The liquid-cooled permanent magnet electric machine of claim 2, wherein: The bracket has multiple positioning posts spaced apart along its circumference on one side end face and multiple slots spaced apart along its circumference on the other side end face. The housing has multiple locking blocks spaced apart along its circumference on the front inner wall. Each locking block is inserted into a corresponding slot. The stator has multiple positioning holes spaced apart along its circumference on both side end faces. Each positioning post is inserted into a corresponding positioning hole.

4. The liquid-cooled permanent magnet electric machine of claim 2, wherein: The pressure plate includes an annular plate and a central block. The central block is located at the center of the annular plate and is connected to the annular plate through multiple connecting arms. The outer circumference of the annular plate is provided with external threads, and the inner wall of the housing is provided with internal threads near the rear support. The annular plate is connected inside the housing through the cooperation of the external and internal threads.

5. The liquid-cooled permanent magnet electric machine of claim 4, wherein: A pressure ring is provided on the front end face of the annular plate, and the pressure ring abuts against the end face of the rear support.

6. The liquid-cooled permanent magnet electric machine of claim 4, wherein: The center block has a tightening port at its center.

7. The liquid-cooled permanent magnet motor according to claim 1, characterized in that: An annular seat is provided on the inner end face of the end cap. The annular seat is located inside the rear opening of the housing, and a first sealing ring is provided between the annular seat and the inner wall of the housing.

8. The liquid-cooled permanent magnet electric machine of claim 7, wherein: A second sealing ring is provided between the end cap and the rear end face of the housing.

Images