Motor system and motorized device comprising such motor system
By designing a busbar with a rigid center part and a braided part, and setting up a sealing device in the motor system, the problem of degradation of sealing effect due to changes in the relative position of the motor and the inverter is solved, and the effective sealing of the two compartments in the motor system and the normal operation of the components is achieved.
Patent Information
- Application Number
- CN202411857272.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-20
- Filing Date
- 2024-12-17
- Publication Date
- 2025-06-20
AI Technical Summary
In existing motor systems, motors and inverters need to be sealed separately due to different humidity or cleanliness requirements, which makes it difficult to effectively seal the busbar when it passes through the compartment wall. Due to differences in manufacturing tolerances and temperatures, the sealing effect decreases due to the change in relative position.
A motor system is designed, wherein the busbar includes a first part extending on the motor side, a second part extending on the inverter side, and a rigid central part connecting the two parts, a hole passing through the wall, at least one of the first part and the second part includes a braided part, and a sealing device, including a sleeve, a sealing ring and a pushing device, is provided between the wall and the central part of the busbar, to ensure the sealing effect.
With this design, the busbar can effectively compensate for the relative position changes between the motor and the inverter while maintaining the sealing of the two compartments, ensuring the normal operation of the components and meeting the specific requirements of each component separately.
Smart Images
Figure CN120185268A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present invention relates to an electric machine system and a motorized device comprising such an electric machine system.
[0002] The present invention can in particular be used in motorized devices. Motorized devices are for example motorized land vehicles, trains, airplanes or even drones. Motorized land vehicles are for example motor vehicles, motorcycles, motorized bicycles or motorized wheelchairs. BACKGROUND ART
[0003] An electric machine system comprises an electric machine and an inverter, which are interconnected by a plurality of busbars. It is known that the electric machine and the inverter use a single common housing. However, they are generally located in two separate compartments of the housing. These two compartments need to be sealed from each other because they each have different requirements. For example, the humidity or cleanliness requirement levels of the inverter and the electric machine may be different.
[0004] Therefore, it is necessary to pass the busbars through the wall separating the two compartments. However, the relative positions of the electric machine and the inverter may differ from the designed positions due to manufacturing tolerances, and / or may change during operation due to thermal expansion caused by the temperature difference between the two compartments.
[0005] The present invention aims to overcome at least part of the aforementioned problems. SUMMARY OF THE INVENTION
[0006] The present invention relates to an electric machine system comprising:
[0007] - an electric machine;
[0008] - an inverter;
[0009] - a wall having a hole, the electric machine and the inverter extending on opposite sides of the wall respectively;
[0010] - a plurality of busbars connecting the electric machine and the inverter, at least one busbar comprising a first portion extending on the electric machine side, a second portion extending on the inverter side, and a rigid central portion connecting the first and second portions, the central portion passing through the hole in the wall; at least one of the first portion and the second portion comprises a braided portion; and
[0011] - a sealing device between the wall and the central portion of the busbar.
[0012] Thanks to the present invention, the busbars are able to compensate for relative position changes while still keeping the two compartments sealed. Sealing both compartments allows ensuring the proper operation of the components and taking into account the specific requirements of each component separately. For example, ensuring that the cooling fluid of the electric machine does not transfer to the dry inverter chamber.
[0013] In particular, thanks to the rigid central portion, the seal can be effective.
[0014] The present invention may also include one or more of the following optional features in any technically possible combination.
[0015] Optionally, the first part and the second part include a braided part, and the central part connects the first and second braided parts.
[0016] Also optionally, the sealing device includes: - a sleeve around the central part of the busbar, the sleeve covering the hole in the wall; - a sealing ring extending between the sleeve and the wall, the sealing ring surrounding the hole in the wall; and - a pushing device configured to push the sleeve towards the wall such that the sleeve squeezes the sealing ring.
[0017] Also optionally, the sleeve extends on the inverter side of the wall.
[0018] Also optionally, the pushing device includes at least one screw that passes through the sleeve and is screwed into the wall.
[0019] Also optionally, the sealing device includes a sealing ring inserted between the central part of the busbar and the wall.
[0020] Also optionally, the motor system includes a housing defining an internal space, the wall dividing the internal space into two compartments, the motor extending in the first compartment and the inverter extending in the second compartment.
[0021] Also optionally, the busbar is made of copper.
[0022] The present invention also relates to a motorized device including the motor system according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The present invention will be better understood with the aid of the following description, which is given by way of example only and with reference to the accompanying drawings, in which:
[0024] - Figure 1 is a schematic view of a first example of a motor system according to the present invention, and
[0025] - Figure 2 is a schematic view of a second example of a motor system according to the present invention. DETAILED DESCRIPTION
[0026] Referring to Figure 1 , the motor system 100 according to the present invention will now be described. The motor system 100 is designed, for example, to be used in a motorized device.
[0027] The motor system 100 first includes a motor 102 having a plurality of phases. The motor 102 can be used as a motor and / or a generator.
[0028] The motor system 100 also includes an inverter 104 that is designed to provide phase voltages U, V, W from a DC voltage source (not shown).
[0029] The motor system 100 further includes a housing 106 that defines an internal space and a wall 108 that divides the internal space into two compartments 110, 112. The motor 102 and the inverter 104 extend on opposite sides of the wall 108. More precisely, the motor 102 extends in the first compartment 110 and the inverter 104 extends in the second compartment 112.
[0030] The motor system 100 further includes a plurality of busbars, Figure 1 only one of which is shown in the figure and is labeled 114. The busbar 114 connects the inverter 104 to the respective phases of the motor 102 to transmit phase voltages U, V, W between the respective phases of the inverter 104 and the motor 102.
[0031] To allow the busbar 114 to pass through the wall 108, the wall 108 is provided with a hole 116.
[0032] The busbar 114 includes a first rigid connection portion 118 connected to the motor 102 and a first flexible braided portion 120 connected to the first rigid connection portion 118 in the first compartment 110.
[0033] Similarly, the busbar 114 includes a second rigid connection portion 122 connected to the inverter 104 and a second flexible braided portion 124 connected to the second rigid connection portion 122 in the second compartment 112.
[0034] The busbar 114 further includes a rigid central portion 126 connecting the first and second braided portions 120, 122, and the rigid central portion 126 passes through the hole 116 in the wall 108. The rigid portions 118, 122, 126 are preferably solid, i.e., not hollow.
[0035] The motor system 100 further includes a sealing device 128 between the wall 108 and the central portion 126 of the busbar 114.
[0036] For example, as shown in the figure, the sealing device 128 includes a sleeve 130 surrounding the central portion 126 of the busbar 114. The sleeve 130 is configured to be waterproof to prevent liquid such as water from spreading from one of the compartments 110, 112 to the other along the central portion 126 of the busbar 114.
[0037] To also prevent liquids such as water from spreading around the sleeve 130, the sleeve 130 is positioned to cover the hole 116 in the wall 108, and the sealing device 128 further includes a sealing ring 132 inserted between the sleeve 130 and the wall 108, with the sealing ring 132 surrounding the hole 116 in the wall 108. The sealing ring 132 is configured to be waterproof to prevent liquids from passing between the wall 108 and the sleeve 130. The sealing device 128 further includes a pushing device 134 configured to push the sleeve 130 against the wall 108 such that the sleeve 130 presses the sealing ring 132 against the wall 108. For example, as shown in the figure, the pushing device 134 includes one or more screws 136 that pass through the sleeve 130 and are screwed into the wall 108.
[0038] In some embodiments, the sleeve 130 includes a single overmolding around the central portion 126 of the generatrix 114.
[0039] In some embodiments, as shown in the figure, the sleeve 130 includes a first overmolding 138 around the central portion 126 of the generatrix 114 and a second overmolding 140 around the first overmolding 138. For example, the first overmolding is made of a soft material and the second overmolding is made of a hard material. The hard overmolding material is used for fixing and structural rigidity, while the softer material is used to ensure tightness during thermal expansion so that the elastic material can follow the deformation of the generatrix.
[0040] Reference Figure 2 , in some embodiments, the sealing device 128 includes a sealing ring 202 inserted between the wall 108 (e.g., as shown in the figure, the edge of the wall around the rim of the hole 116 (i.e., the width)) and the central portion 126 of the generatrix 114.
[0041] As described above, generatrices different from the generatrix 114 may have the same structure as the generatrix 114. All generatrices 114 may pass through corresponding holes in the wall 108 or through the same hole, in which case all generatrices 114 may be surrounded by the same single sleeve.
[0042] In summary, it should be noted that the present invention is not limited to the above-described embodiments. It will be apparent to those skilled in the art that various modifications can be made to the above-described embodiments based on the teachings just disclosed to them.
[0043] In the foregoing detailed description of the present invention, the terms used should not be construed as limiting the invention to the embodiments set forth in this specification, but must be construed to include all equivalents, the prediction of which is within the ability of those skilled in the art by applying the general knowledge of those skilled in the art to the embodiments just disclosed to them.
Claims
1. A motor system (100), comprising: - an electric motor (102); - an inverter (104); - a wall (108) having a hole (116), the motor (102) and the inverter (104) extending on both sides of the wall (108); - a plurality of busbars connecting the motor (102) and the inverter (104), at least one busbar (114) comprising a first portion (120) extending on the motor (102) side, a second portion (124) extending on the inverter (104) side, and a rigid central portion (126) connecting the first and second portions (120, 124), the central portion (126) passing through a hole (116) in the wall (108); at least one of the first portion (120) and the second portion (124) comprising a braided portion, and - Sealing means (128) between the wall (108) and the central portion (126) of the busbar (114).
2. The motor system (100) according to claim 1, wherein: The first portion (120) and the second portion (124) include braided portions, and the central portion (126) connects the first and second braided portions (120, 124).
3. The motor system (100) according to claim 1 or 2, wherein: The sealing device (128) comprises: - a sleeve (130) surrounding the central portion (126) of said busbar (114), the sleeve (130) covering the hole (116) of the wall (108); a sealing ring (132) extending between the sleeve (130) and the wall (108), the sealing ring (132) surrounding the hole (116) of the wall (108); and - a pushing device (128) configured to push the sleeve (130) towards the wall (108) so that the sleeve (130) presses against the sealing ring (132).
4. The motor system (100) according to claim 3, wherein: The sleeve (130) extends on the inverter side of the wall (108).
5. The motor system (100) according to claim 3 or 4, wherein: The urging means (134) comprises at least one screw (136) passing through the sleeve (130) and screwed into the wall (108).
6. The motor system (100) according to claim 1 or 2, wherein: The sealing device (128) comprises a sealing ring (202) interposed between a central portion (126) of the busbar (114) and the wall (108).
7. The motor system (100) according to any one of claims 1 to 6, further comprising a housing (106) defining an interior space, wherein the wall (108) divides the interior space into two compartments (110, 112), the motor (102) extending in a first compartment (110), and the inverter (104) extending in a second compartment (112).
8. The motor system (100) according to any one of claims 1 to 7, wherein: The busbar (114) is made of copper.
9. A motorized device comprising the motor system (100) according to any one of claims 1 to 8.