Rotating electric machine housing

Abstract

A rotating electrical machine housing is described comprising at least one cooling fluid inlet in an upper portion of the housing; at least one cooling fluid outlet in the lower portion of the housing; an inner surface having a first side of the inner surface and a second side of the inner surface, where the first side and the second side face each other, the first side comprising at least one set of first side recesses and the second side comprising at least one set of second side recesses; wherein the at least one set of recesses on the first side and the second side respectively includes at least one main channel, where the at least one main channel extends radially on the inner surface of the housing, and where the at least one main channel is connected to the plurality of lateral channels.

Description

Technical Field

[0001] The present invention relates to a rotary motor housing having a recess on its inner surface for circulating cooling fluid. Background Technology

[0002] Rotating electric machines, or simply electric motors, are widely known in the art and comprise a static part (stator and coil heads) and a rotating part (rotor). Depending on the intended application of the motor, it must meet well-defined specifications regarding the power, torque, corrosion resistance, complexity, and weight of the components. The motor also includes an external housing that functions to connect the internal components, protect the entire machine assembly, and serve as the system's grounding.

[0003] During motor operation, the machine will heat up regardless of its application. Overheating of the motor can cause machine problems such as reduced lifespan and loss of machine performance.

[0004] According to existing technology, solutions for motor overheating include applying a cooling fluid, preferably oil, but also any non-conductive fluid, to the moving parts of the motor.

[0005] In this regard, applicant DANA HEAVY VEHICLE SYS GROUP published US20210044172 A1, entitled "Electric axle assembly," on February 11, 2021, describing a "cooling jacket" type housing for an electric motor. This housing has protrusions adapted to contact the stator surface. A fluid passage is formed by the cooling jacket body, the protrusions, and the surface of the electric motor stator. The fluid passage is arranged to allow cooling fluid to flow in a serpentine path across the stator surface to remove heat from the stator. A jet ring is fluidly coupled to the fluid passage, allowing cooling fluid to flow into the passage, through the outer circumference of the electric motor stator, and out of orifices in the jet ring to cool the stator windings. The protrusions are obtained using a pair of anti-symmetrically aligned casting molds, thereby forming the serpentine fluid path during the forming of the cooling jacket body. This document uses a serpentine fluid loop in the housing instead of longitudinal and unidirectional channels. Furthermore, the housing is formed from more than one element, namely a jacket or "cooling jacket," a first member and a second member arranged at each of the ends, wherein one of the elements is associated with the injection ring. The housing in the aforementioned document is not formed from a single component including all the referenced elements, and the housing in the aforementioned document is very complex.

[0006] Huawei Technologies Co., Ltd. disclosed an international publication, WO2019 / 91351A1, on May 16, 2019, entitled "Motor, power assembly, power device, and motor cooling method," which discloses a motor including a housing and an oil cooling mechanism. The oil cooling mechanism includes: a stator cooling oil tank disposed on a first inner wall of the housing opposite the stator; a cooling oil tank; an oil inlet channel disposed at the top of the housing; and an oil outlet channel disposed at the bottom of the housing. The oil cooling mechanism allows the cooling oil to directly contact the outer wall of the stator and the final winding. This document uses a fluid circuit consisting of U-shaped channels in the housing, instead of longitudinal and axial channels. Furthermore, the aforementioned document uses an oil overflow element disposed in a portion above the coil head, and the housing described in the aforementioned document is quite complex.

[0007] The applicant, Ningbo Baosi Energy Equipment Co., Ltd., published Chinese utility model CN ​​207677580 U on July 31, 2018, entitled "Cold motor of oil with spiral oil duct," describing an electric motor with a spiral oil duct, including a housing, a stator, and a rotor. The motor housing is adjacent to the outer surface of the stator, and its inner surface is provided with grooves for oil passages. The motor housing is provided with an oil inlet and an outlet, which are respectively connected to the two ends of the oil duct. This document uses a fluid circuit in the housing, with a spiral channel along the inner surface of the housing, without using longitudinal and axial channels. Furthermore, this document does not teach providing a means for direct and intentional contact between the cooling oil and the coil heads of the stator. In such documents, the oil only cools the outer surface of the stator plate assembly.

[0008] The applicant, REMY TECHNOLOGIES LLC, described an electric motor in its international publication WO2012 / 50741A2, entitled "Electric machine cooling system and method," published on April 19, 2012. The motor has a stator and a housing that at least partially surrounds the motor. The housing includes at least two housing members that are joined together and substantially secure the motor within the housing. The motor module also includes a cooling jacket defined at least partially by the outer diameter of the stator and the inner diameter of the housing. Therefore, this document describes a split housing.

[0009] As can be seen above, there are many efforts in the existing technology to achieve motors with cooling systems or highly efficient cooled motors.

[0010] However, the problem with the existing technology is that the housing requires additional structural components to cool the motor, especially the stator and coil heads, which increases the complexity of the machine and thus increases the final cost and reduces its cost / benefit ratio.

[0011] In addition, another problem with existing technology is the reality that there is insufficient heat dissipation between the cooling fluid and the moving parts of the machine.

[0012] Therefore, one object of the present invention is to solve the aforementioned problems by providing a motor housing that includes recesses on its inner surface for the circulation of cooling fluid, and that the housing contains internal channels for the circulation of cooling fluid, preferably oil, in direct contact with the moving parts of the motor. Compared to known motors, motors incorporating the housing of the present invention exhibit enhanced heat dissipation and higher efficiency, as well as lower complexity and therefore lower final cost and higher cost / benefit. Summary of the Invention

[0013] One of the objectives of this invention is to provide a rotary motor housing that does not require additional structural components to cool the stator and coil heads present in the motor.

[0014] Another object of the present invention is to provide a motor comprising the housing of the present invention, which exhibits increased heat dissipation capacity and higher efficiency.

[0015] Another object of the present invention is to provide a rotary motor housing that has lower complexity than motors known in the prior art, and therefore has lower final cost and higher cost / benefit ratio.

[0016] Another object of the present invention is to provide an electric motor housing having a channel for fluid transfer, the channel having an optimized geometry.

[0017] One of the objectives of this invention is to provide an electric motor housing that incorporates a guide element for cooling fluid in a single-piece casting or injection mold.

[0018] These objectives are achieved by means of a rotary motor housing, which includes: At least one cooling fluid inlet in the upper portion of the casing; At least one cooling fluid outlet in the lower portion of the casing; An inner surface having a first side and a second side, wherein the first side and the second side face each other. The first side includes at least one set of first side recesses, and the second side includes at least one set of second side recesses; The at least one set of first side recesses and the at least one set of second side recesses respectively include: At least one main channel extends radially across the inner surface of the housing, and because the at least one main channel is mentioned, it is connected to a plurality of lateral channels.

[0019] Furthermore, according to the invention, at least one main channel can be aligned with at least one cooling fluid inlet.

[0020] According to the present invention, at least one main channel may be located near at least one cooling fluid inlet.

[0021] In addition, the lateral channels extend longitudinally on the inner surface of the housing and are arranged parallel to each other.

[0022] Another characteristic of the lateral channels is that they are angled and taper towards either the farthest end of at least one main channel or the nearest end of at least one main channel. Furthermore, these lateral channels can have a curved or straight shape and a constant thickness, which varies between 5% and 50% of the total thickness of the housing wall including the lateral channels.

[0023] According to the present invention, at least one set of first side recesses and at least one set of second side recesses are symmetrical or asymmetrical.

[0024] Furthermore, according to the invention, at least one cooling fluid inlet is arranged in the central portion of the upper portion, and at least one cooling outlet is arranged in the central portion of the lower portion. Attached Figure Description

[0025] The objects and advantages of the present invention will become more apparent from the following detailed description of the embodiments and non-limiting drawings presented at the end of this document:

[0026] Figure 1 The illustration shows a perspective view of the housing according to an embodiment of the present invention.

[0027] Figure 2 The illustration shows a longitudinal cross-sectional view, illustrating the first side of the housing according to an embodiment of the present invention.

[0028] Figure 3 The illustration shows a longitudinal cross-sectional view, illustrating the second side of the housing according to an embodiment of the invention.

[0029] Figure 4 The illustration shows a longitudinal cross-sectional view, illustrating the first side of the housing according to another embodiment of the present invention.

[0030] Figure 5The illustration shows a longitudinal cross-sectional view, illustrating the second side of the housing according to an embodiment of the present invention. Detailed Implementation

[0031] Although the invention may have different embodiments, a preferred embodiment is shown in the following detailed discussion. It should be understood that this specification should be considered as an example of the principles of the invention, and the invention is not limited to what has been illustrated and described herein.

[0032] according to Figure 1 According to an embodiment of the present invention, the housing of the motor includes an upper portion 100, a lower portion 105, and an inner surface 110.

[0033] Figure 2 and Figure 3 A cooling fluid inlet 200 is shown disposed at the center of the upper portion 100, and two cooling outlets 300 disposed on a first side 110A and a second side 110B of the inner surface at the center of the lower portion 105, wherein the first side 110A and the second side 110B of the inner surface face each other. In another embodiment, the cooling outlet 300 is disposed on the first side of the inner surface 110A, and the second outlet 300 is disposed on the second side of the inner surface 110B. In other embodiments, two or more cooling fluid inlets 200s may be used, and one, three or more cooling fluid outlets 300 may be used. Furthermore, the cooling fluid inlet and outlet are not disposed at the center of the upper portion and the center of the lower portion, respectively, but may be located in a portion closer to the end of the housing. Therefore, according to the invention, at least one cooling fluid inlet 200 and at least one cooling outlet 300 are used.

[0034] Figure 2 and Figure 3 An inner surface 110 is also shown, comprising a first side 110A and a second side 110B. The first side includes a set of first side recesses 120A, and the second side includes a set of second side recesses 120B. The aforementioned set of first side recesses 120A and set of second side recesses 120B are preferably symmetrical. In another embodiment, the set of first side recesses 120A and set of second side recesses 120B are asymmetrical. In other embodiments, depending on the dimensions of the housing and the recess sets, more than one set of recesses may be used on each side of the inner surface. Therefore, according to the invention, the first side 110A of the inner surface includes at least one set of first side recesses 120A, and the second recess side 110B includes at least one set of second side recesses 120B.

[0035] In addition, according to Figure 2 and Figure 3The first side recess group 120A and the second side recess group 120B each include a main channel 350, which extends radially on the inner surface 110 of the housing. Additionally, the main channel 350 is aligned with at least one cooling fluid inlet 200, i.e., the upper portion of the main channel 350 is physically associated with the cooling fluid inlet 200. In other embodiments, the main channel 350 is adjacent to the cooling fluid inlet 200, i.e., the main channel 350 and the fluid inlet 200 are not physically associated with each other.

[0036] In other embodiments, the so-called recess groups 120A, 120B include two, three, or more main channels extending radially and parallel to the inner surface 110. For example, according to Figure 4 and Figure 5 The first side recess group 120A and the second side recess group 120B respectively include a first main channel 400 and a second main channel 500, and the first main channel 400 and the second main channel extend radially and parallel to each other on the inner surface 110 of the housing.

[0037] Therefore, according to the present invention, the recesses 120A, 120B include at least one main channel 350 extending radially on the inner surface 110.

[0038] At least one main channel 350 is connected to multiple side channels 600.

[0039] The lateral channels 600 are arranged parallel to each other and extend longitudinally on the inner surface 110 of the housing. Therefore, the lateral channels 600 extend toward the ends of the housing.

[0040] According to one embodiment, the lateral channel 600 is angled and tapers gradually toward either the distal end or the proximal end of the main channel. In other embodiments, the lateral channel 600 may have other shapes; for example, the lateral channel 600 may be curved or straight and have a constant thickness that varies between 5% and 50% of the total thickness of the housing wall including the lateral channel 600.

[0041] Therefore, according to the present invention, the cooling fluid enters the housing through the fluid inlet 200, flows through the inner surface 110 into the main channel 350 and the side channel 600, and then leaves through the outlet 300, is discharged, and is used again to cool the motor.

[0042] In addition to the embodiments presented above, the same inventive concept can be applied to other alternatives or possibilities in the use of the invention. For example, a very long housing may have several components including a main channel and side channels.

[0043] Although the invention has been described in conjunction with certain preferred embodiments, it must be understood that the invention is not intended to be limited to those specific descriptions. Rather, it is intended to cover all possible alternatives, modifications, and equivalents within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A rotary motor housing, characterized in that, The rotary motor housing includes: At least one cooling fluid inlet (200) in the upper portion (100) of the rotary motor housing; At least one cooling fluid outlet (300) in the lower portion (105) of the rotary motor housing; An inner surface (110) having a first side (110A) and a second side (110B) facing each other. The first side (110A) includes at least one set of first side recesses (120A), and the second side (110B) includes at least one set of second side recesses (120B); Wherein, the at least one set of first side recesses (120A) and the at least one set of second side recesses (120B) respectively include: At least one main channel (350), wherein the at least one main channel (350) extends radially across the inner surface (110) of the rotary motor housing. The at least one main channel (350) is connected to a plurality of side channels (600).

2. The rotary motor housing according to claim 1, characterized in that, The at least one main channel (350) is aligned with at least one cooling fluid inlet (200).

3. The rotary motor housing according to claim 1, characterized in that, The at least one main channel (350) is located near at least one cooling fluid inlet (200).

4. The rotary motor housing according to claim 1, characterized in that, The plurality of lateral channels (600) extend longitudinally and are arranged parallel to each other on the inner surface (110) of the rotary motor housing.

5. The rotary motor housing according to claim 1, characterized in that, The lateral channel (600) is angled and tapers towards the farthest end of the at least one main channel (350).

6. The rotary motor housing according to claim 1, characterized in that, The lateral channel (600) is angled and tapers towards the nearest end of the at least one main channel (350).

7. The rotary motor housing according to claim 1, characterized in that, The lateral channel (600) has a curved or straight shape and a constant thickness that varies from 5% to 50% of the total thickness of the housing wall including the lateral channel (600).

8. The rotary motor housing according to claim 1, characterized in that, The at least one set of first side recesses (120A) and the at least one set of second side recesses (120B) are symmetrical or asymmetrical.

9. The rotary motor housing according to claim 1, characterized in that, The at least one cooling fluid inlet (200) is arranged in the central portion of the upper portion (100), and the at least one cooling fluid outlet (300) is arranged in the central portion of the lower portion (105).

10. The rotary motor housing according to claim 1, characterized in that, The rotary motor housing incorporates a guide element for cooling fluid in a single-piece casting or injection mold.

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