Rotor arrangement and drive motor

Abstract

The utility model relates to a rotor device and driving motor, rotor device includes: drive shaft, it includes axle passage, and rotor is installed around drive shaft and includes: rotor main part, it includes with the axle passage intercommunication and along the circumferential direction distribution of rotor main part multiple main body passage, every main body passage includes first main body passage section and second main body passage section, and multiple permanent magnet, every permanent magnet is received to the first main body passage section of corresponding one main body passage, to make every permanent magnet's main surface face the second main body passage section of corresponding one main body passage, coolant flows into the second main body passage section of every main body passage via axle passage to directly cool every permanent magnet's main surface. The utility model provides rotor device and driving motor effectively promote every permanent magnet to be cooled the efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drive motor technology, specifically to a rotor device and a drive motor. Background Technology

[0002] With the rapid development of vehicles, there is a desire to continuously increase the power density of drive motors while strictly limiting their size and weight. As a result, the rotational speed of drive motors has also been increased.

[0003] As the speed of the drive motor increases, it is more likely to generate excessive heat during operation, causing the temperature of the rotor assembly, especially the permanent magnets (e.g., magnets) in the rotor assembly, to rise rapidly. The excessively high temperature of the permanent magnets can lead to demagnetization, which is detrimental to the stable operation of the drive motor. Utility Model Content

[0004] One object of this invention is to provide an improved rotor device and drive motor that overcomes the deficiencies of the prior art.

[0005] According to one aspect of the present invention, a rotor device is provided, comprising: a drive shaft including a shaft channel; and a rotor mounted around the drive shaft and comprising: a rotor body including a plurality of main channels communicating with the shaft channel and distributed along the circumferential direction of the rotor body, each main channel including a first main channel section and a second main channel section; and a plurality of permanent magnets, each permanent magnet being received in the first main channel section of a corresponding main channel such that the main surface of each permanent magnet faces the second main channel section of the corresponding main channel, and coolant flowing into the second main channel section of each main channel via the shaft channel to directly cool the main surface of each permanent magnet.

[0006] Optionally, each main channel also includes a third main channel section. When each permanent magnet is received into the first main channel section of the corresponding main channel, the side surface of each permanent magnet faces the third main channel section of the corresponding main channel, and adhesive is filled into the third main channel section of each main channel to firmly fix each permanent magnet into the first main channel section of the corresponding main channel.

[0007] Optionally, the plurality of main channels are arranged in pairs, each pair of main channels including a first main channel and a second main channel, defining a corresponding radial line of the rotor body between the first main channel and the second main channel, and the first main channel and the second main channel gradually move away from each other as they extend outward at an inclination relative to the corresponding radial line of the rotor body.

[0008] Optionally, the rotor further includes a magnetic shielding plate, which is fixed to the axial end of the rotor body and includes a plurality of first plate channels distributed along the circumferential direction of the magnetic shielding plate. Each first plate channel includes a main trunk and a first branch and a second branch extending from the main trunk. At least a portion of the first branch is axially aligned with a second main channel section of the first main channel of a corresponding pair of main channels, and at least a portion of the second branch is axially aligned with a second main channel section of the second main channel of the second main channel of a corresponding pair of main channels. Coolant flows into the second main channel section of each main channel via the shaft channel and each first plate channel.

[0009] Optionally, each of the first branch and the second branch includes a first branch portion extending obliquely outward from the main trunk and a second branch portion extending smoothly from the first branch portion. The width of the first branch portion is narrower than the width of the main trunk, and the width of the second branch portion is narrower than the width of the first branch portion. The second branch portion of each of the first branch and the second branch is axially aligned with the second main channel section of each of the first main channel and the second main channel of the corresponding pair of main channels.

[0010] Optionally, the magnetic shielding plate further includes a plurality of second plate channels that are alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section, a second plate channel section, a first orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the first plate channel section, and a second orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the second plate channel section. The rotor includes two magnetic shielding plates, and the two magnetic shielding plates are respectively fixed to two axial ends of the rotor body. The second branch portion of each of the first branch and the second branch of each of the first plate channels of one magnetic shielding plate is axially aligned with the first plate channel section and the second plate channel section of each of the second plate channels of the other magnetic shielding plate. Coolant flowing out from the second main channel section of each main channel leaves the rotor device through each second plate channel.

[0011] Optionally, the magnetic shielding plate is a first magnetic shielding plate, which is fixed to one axial end of the rotor body. The rotor also includes a second magnetic shielding plate fixed to the other axial end of the rotor body. The second magnetic shielding plate includes a plurality of second plate channels distributed along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section, a second plate channel section, a first orifice extending radially inward from the outer periphery of the second magnetic shielding plate to communicate with the first plate channel section, and a second orifice extending radially inward from the outer periphery of the second magnetic shielding plate to communicate with the second plate channel section. The second branch portion of each of the first branch and the second branch of each of the first plate channels of the first magnetic shielding plate is axially aligned with the first plate channel section and the second plate channel section of each of the second plate channels of the second magnetic shielding plate. Coolant flowing out from the second main channel section of each main channel leaves the rotor assembly through each second plate channel.

[0012] Optionally, the second main channel section of each of the first main channel and the second main channel includes a spaced-apart inner sub-channel section and an outer sub-channel section, and each of the first branch and the second branch also includes a third branch section spaced apart from the second branch section. The second branch section and the third branch section of each of the first branch and the second branch are respectively axially aligned with the inner sub-channel section and the outer sub-channel section of the second main channel section of each of the corresponding pair of main channels.

[0013] Optionally, the magnetic shielding plate further includes a first orifice and a second orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the third branch portion of each of the first branch and the second branch, respectively, and a plurality of second plate channels alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section and a second plate channel section. The rotor includes two magnetic shielding plates, and the two magnetic shielding plates are respectively fixed to the two axial ends of the rotor body. The second branch portion and the third branch portion of each of the first branch and the second branch of each of the first plate channels of one magnetic shielding plate are axially aligned with the first plate channel section and the second plate channel section of each of the second plate channels of the other magnetic shielding plate, respectively. Coolant flowing out from the second main channel section of each main channel leaves the rotor device through each first plate channel.

[0014] Optionally, the magnetic shielding plate further includes a first orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the third branch portion, and a second orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the third branch portion. The magnetic shielding plate is a first magnetic shielding plate, which is fixed to one axial end of the rotor body. The rotor also includes a second magnetic shielding plate fixed to the other axial end of the rotor body. The second magnetic shielding plate includes a plurality of second plate channels that are alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section and a second plate channel section. The second branch portion and the third branch portion of each of the first branches and second branches of each of the first plate channels of the first magnetic shielding plate are axially aligned with the first plate channel section and the second plate channel section of each of the second plate channels of the second magnetic shielding plate. Coolant flowing out from the second main channel section of each main channel leaves the rotor assembly via each first plate channel.

[0015] According to another aspect of the present invention, an electric motor is provided, which includes the rotor device described above.

[0016] The rotor device and drive motor provided by this invention can directly cool the main surface of each permanent magnet, thereby effectively improving the cooling efficiency of each permanent magnet.

[0017] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0019] Figure 1 This is an assembled perspective view of a rotor device according to one embodiment of this application.

[0020] Figure 2 This is an exploded perspective view of a rotor device according to one embodiment of this application.

[0021] Figure 3 yes Figure 1 A perspective view of the drive shaft of the rotor device.

[0022] Figure 4 yes Figure 1 A three-dimensional view of the rotor body of the rotor device.

[0023] Figure 5 yes Figure 4 A partial side view schematic diagram with exaggerated proportions of the main channel of the rotor body.

[0024] Figure 6 yes Figure 1A perspective view of one of the two magnetic shielding plates of the rotor device.

[0025] Figure 7 yes Figure 1 A perspective view of the other magnetic plate among the two magnetic plates of the rotor device.

[0026] Figure 8 This is a perspective view of one of the two magnetic shielding plates of a rotor device according to another embodiment of this application.

[0027] Figure 9 This is a perspective view of one of the two magnetic shielding plates of a rotor device according to another embodiment of this application. Detailed Implementation

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0029] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] In this document, the terms “connected” and “fixed” can mean that component A and component B, which are “connected” or “fixed” to component A, are manufactured and installed together separately, or they can mean that component A and component B are formed as a single unit, wherein there may be intermediate components between component A and component B.

[0033] In this document, the terms “first” and “second” are used only to distinguish part A from part B and should not be construed as indicating or implying the quantity or relative importance of parts A and B.

[0034] As is well known, a drive motor, such as a permanent magnet synchronous motor, includes: a housing; a stator assembly fixed within the housing; and a rotor assembly rotatably disposed within the housing relative to the stator assembly. During operation, the drive motor generates heat, causing the temperature of the rotor assembly, particularly the permanent magnets (e.g., magnets), to rise. Excessive temperature of the permanent magnets can lead to demagnetization, which is detrimental to the stable operation of the drive motor. Therefore, a coolant (e.g., oil) can be pumped from the oil tank to the rotor assembly by an oil pump during drive motor operation to assist in cooling the rotor assembly, particularly the permanent magnets.

[0035] Reference Figure 1 and Figure 2 The example rotor assembly 10 includes: a drive shaft 12; and a rotor mounted coaxially around the drive shaft 12, for example, the rotor including a rotor body 16 and magnetic shielding plates connected to the axial ends of the rotor body 16. For example, the rotor includes two magnetic shielding plates 18a and 18b (magnetic shielding plate 18a will be used as an example below), which are respectively connected to the two axial ends of the rotor body 16. Both the rotor body 16 and the magnetic shielding plate 18a have a cylindrical shape, and the inner peripheries of the rotor body 16 and the magnetic shielding plate 18a substantially match the outer periphery of the drive shaft 12, so as to facilitate the insertion of the drive shaft 12 into the rotor during the installation of the rotor assembly 10.

[0036] like Figure 3 As shown, the drive shaft 12 includes a shaft channel, which may include a first shaft channel section 20a and a second shaft channel section 20b. For example, the first shaft channel section 20a extends axially from at least one of the two end faces of the drive shaft 12 into the drive shaft 12 but does not extend axially through the drive shaft 12, while the second shaft channel section 20b extends radially inward from the outer periphery of the drive shaft 12 until it connects with the first shaft channel section 20a. Coolant can flow into the first shaft channel section 20a and into the second shaft channel section 20b under the action of the centrifugal force generated by the rotation of the rotor device 10.

[0037] Reference Figure 2 and Figure 4 The rotor body 16 includes a plurality of main channels 22 regularly distributed along the circumferential direction of the rotor body 16 between the outer and inner peripheries of the rotor body 16. Each main channel 22 extends axially through the rotor body 16.

[0038] like Figure 4As shown, each main channel 22 includes first and second main channel segments 22a and 22b. The first main channel segment 22a may be generally cubic in shape; therefore, the axial section and cross section of the first main channel segment 22a are both rectangular, and it has a first main surface and a second main surface opposite to the first main surface, as well as first and second side surfaces located on both sides of the first and second main surfaces. The area of ​​the first and second main surfaces is significantly larger than the area of ​​the first and second side surfaces. The second main channel segment 22b extends from at least one of the first main surface and the second main surface of the first main channel segment 22a to communicate with the first main channel segment 22a.

[0039] The rotor also includes a plurality of permanent magnets (not shown), each of which may be approximately cubic in shape. Therefore, the axial and cross-sectional sections of the permanent magnets are rectangular, and each has a first main surface and a second main surface opposite to the first main surface, as well as first and second side surfaces located on either side of the first and second main surfaces. The areas of the first and second main surfaces are significantly larger than the areas of the first and second side surfaces. When each permanent magnet is inserted into the first main channel segment 22a of a corresponding main channel 22 during the installation of the rotor assembly 10, the first and second main surfaces of each permanent magnet are respectively matched with the first and second main surfaces of the first main channel segment 22a of the corresponding main channel 22, such that at least one of the first and second main surfaces of each permanent magnet faces the second main channel segment 22b of the corresponding main channel 22.

[0040] It is worth noting that, in engineering design, a "main surface" refers to the surface with the largest area, most important function, or primarily used for mating / contact among the various surfaces of a component. For example, here, the first and second main surfaces of the first main channel segment 22a and the first and second main surfaces of the permanent magnet have relatively large areas and are used for mutual mating / contact. It is understood that the permanent magnet and the first main channel segment 22a can also have other three-dimensional shapes, as long as the permanent magnet and the first main channel segment 22a each have a large main surface that primarily undertakes the mating / contact function.

[0041] Coolant exiting from the second axis channel section 20b can flow into the second main channel section 22b of each main channel 22 to directly cool the main surface of each permanent magnet, thereby effectively improving the cooling efficiency of each permanent magnet.

[0042] The cross-section of the second main channel section 22b can also be quadrilateral, but this is not mandatory. The area of ​​the cross-section of the second main channel section 22b is much smaller than the area of ​​the first main channel section 22a. For example, the length of the cross-section of the second main channel section 22b can be less than the length of the first main channel section 22a. Alternatively or supplementarily, the width of the cross-section of the second main channel section 22b can be less than the width of the first main channel section 22a.

[0043] Each main channel 22 also includes a third main channel section 22c, which extends from at least one of the first and second side surfaces of the first main channel section 22a to communicate with the first main channel section 22a. When each permanent magnet is inserted into the first main channel section 22a of the corresponding main channel 22, the first and second side surfaces of each permanent magnet mate with the first and second side surfaces of the first main channel section 22a of the corresponding main channel 22, such that at least one of the first and second side surfaces of each permanent magnet faces the third main channel section 22c of the corresponding main channel 22. An adhesive is filled into the third main channel section 22c of each main channel 22 to securely fix each permanent magnet to the first main channel section 22a of the corresponding main channel 22. For example, the adhesive is resin. The third main channel section 22c itself provides a gap to facilitate easy insertion of each permanent magnet into the first main channel section 22a of the corresponding main channel 22 during the installation of the rotor device 10.

[0044] Continue to refer to Figure 4 And also Figure 5As schematically shown, the plurality of main channels 22 can be considered as being arranged in pairs, each pair of main channels 22 including first and second main channels 22-1, 22-2 and can be used for a corresponding pair of permanent magnets having the same polarity. For example, a main channel reference line L0 coinciding with a corresponding radial line of the rotor body 16 is defined between each pair of main channels 22. The first main channel 22-1 extends along a first extension line L1 of the rotor body 16 from a first radius of the rotor body 16 to a second radius greater than the first radius, wherein the first extension line L1 of the rotor body 16 is inclined at a first angle α1 clockwise relative to the main channel reference line L0. The second main channel 22-2 extends along a second extension line L2 of the rotor body 16 from a first radius of the rotor body 16 to a second radius, wherein the second extension line L2 of the rotor body 16 is inclined at a second angle α2 counterclockwise relative to the main channel reference line L0. The first angle α1 can be equal to the second angle α2. Thus, the first and second main channels 22-1 and 22-2 gradually move away from each other as they extend outward at an incline relative to the main channel baseline L0, wherein the first main surface of each of the first and second main channels 22-1 and 22-2 faces the main channel baseline L0, and the second main surface of each of the first and second main channels 22-1 and 22-2 faces away from the main channel baseline L0.

[0045] When the second main channel segments 22b of the first and second main channels 22-1 and 22-2 are configured as a continuous single channel, the second main channel segment 22b of the first main channel 22-1 can extend from one of the first and second main surfaces of the first main channel 22-1, and the second main channel segment 22b of the second main channel 22-2 can extend from one of the first and second main surfaces of the first main channel 22-1.

[0046] Alternatively, such as Figure 5 As shown, the second main channel segment 22b may include a spaced-apart outer sub-channel segment 22b1 located near the second radius of the rotor body 16 and an inner sub-channel segment 22b2 located near the first radius of the rotor body 16. In this case, the outer sub-channel segment 22b1 of each of the first and second main channels 22-1, 22-2 may extend from one of the first and second main surfaces, and the inner sub-channel segment 22b2 of each of the first and second main channels 22-1, 22-2 may extend from the other of the first and second main surfaces. For example, when the second main channel segments 22b of the first and second main channels 22-1, 22-2 both extend from the same first and second main surfaces of the first main channel 22-1, the first and second main channels 22-1, 22-2 may be symmetrical with respect to the main channel reference line L0.

[0047] Reference Figure 6 In one embodiment, the magnetic shielding plate 18a includes a plurality of first plate channels that are regularly distributed along the circumferential direction of the magnetic shielding plate 18a. Each first plate channel does not penetrate the magnetic shielding plate 18a axially, but forms a groove relative to one end face of the magnetic shielding plate 18a. For example, each first plate channel includes: a main trunk 24 extending radially outward from the inner periphery of the magnetic shielding plate 18a along a corresponding first radial line T0 to a first radius of the magnetic shielding plate 18a; and first and second branches extending from the main trunk 24, the first branch extending along a first extension line T1 of the magnetic shielding plate 18a from the first radius of the magnetic shielding plate 18a to a second radius greater than the first radius, wherein the first extension line T1 of the magnetic shielding plate 18a is inclined at a third angle clockwise relative to the first radial line T0, and the second branch extending along a second extension line T2 of the magnetic shielding plate 18a from the first radius of the magnetic shielding plate 18a to the second radius of the magnetic shielding plate 18a, wherein the second extension line T2 of the magnetic shielding plate 18a is inclined at a fourth angle counterclockwise relative to the first radial line T0. The third angle may be equal to the fourth angle. Thus, the first plate channels form a Y-shaped layout.

[0048] Optionally, each of the first and second branches includes a first branch portion 26a1, 26a2 extending obliquely from the main trunk 24 and a second branch portion 26b1, 26b2 extending smoothly from the first branch portions 26a1, 26a2. Specifically, the first branch portions 26a1, 26a2 extend from a first radius of the magnetic shielding plate 18a to a third radius between the first and second radii, and the second branch portions 26b1, 26b2 extend from the third radius of the magnetic shielding plate 18a to the second radius. The width of the first branch portions 26a1, 26a2 of each of the first and second branches perpendicular to a corresponding one of the first and second extension lines T1, T2 is narrower than the width of the main trunk 24 perpendicular to the first radial line T0. The width of the second branch portions 26b1, 26b2 perpendicular to a corresponding one of the first and second extension lines T1, T2 is narrower than the width of the first branch portions 26a1, 26a2.

[0049] When the magnetic shielding plate 18a is fixed to the axial end of the rotor body 16 during the installation of the rotor assembly 10, the second branch portions 26b1, 26b2 of each of the first and second branches are axially aligned with the second main channel segment 22b of the corresponding one of the first and second main channels 22-1, 22-2 in the corresponding pair of main channels 22. Simultaneously, the first radial line T0 of the magnetic shielding plate 18a is also substantially aligned with the main channel reference line L0 of the rotor body 16. It can be understood that the third radius of the magnetic shielding plate 18a can be substantially equal to the first radius of the rotor body 16. The second radius of the magnetic shielding plate 18a can be substantially equal to the second radius of the rotor body 16.

[0050] The coolant flowing out of the second shaft channel section 20b can flow through a corresponding first plate channel before flowing into the second main channel section 22b of each main channel 22. That is, under the action of centrifugal force, it flows sequentially through the main trunk 24, the first branch portions 26a1, 26a2 and the second branch portions 26b1, 26b2 of the first plate channel. In this way, the coolant is accelerated when it flows from the first branch portions 26a1, 26a2 into the narrowed second branch portions 26b1, 26b2, so as to facilitate the further flow of coolant into the second main channel section 22b of each main channel 22.

[0051] Optionally, the magnetic shielding plate 18a further includes a plurality of second plate channels alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate 18a. Each second plate channel includes first and second plate channel sections 30, 32. Each of the first and second plate channel sections 30, 32 may be configured as a groove formed relative to the end face of the magnetic shielding plate 18a. For example, a plate channel reference line T3 coinciding with a corresponding second radial line of the magnetic shielding plate 18a is defined between the first and second plate channel sections 30, 32. The first plate channel section 30 extends from a third radius of the magnetic shielding plate 18a to a second radius along a third extension line T4 of the magnetic shielding plate 18a, wherein the third extension line T4 of the magnetic shielding plate 18a is inclined at a fifth angle clockwise relative to the plate channel reference line T3. The second plate channel segment 32 extends along the fourth extension line T5 of the magnetic shielding plate 18a from the third radius to the second radius, wherein the fourth extension line T5 of the magnetic shielding plate 18a is inclined at a sixth angle counterclockwise relative to the plate channel reference line T3. The fifth angle may be equal to the sixth angle. Thus, the first and second plate channel segments 30 and 32 gradually move away from each other as they extend outwards at an inclination relative to the plate channel reference line T3.

[0052] Understandable, although Figure 6 Each of the first and second plate channel sections 30 and 32 shown includes two spaced-apart sub-channel sections, but each of the first and second plate channel sections 30 and 32 can also be configured as a continuous single channel.

[0053] Each second plate channel further includes: a first aperture 34 extending radially inward from the outer periphery of the magnetic shielding plate 18a to communicate with the first plate channel section 30; and a second aperture 36 extending radially inward from the outer periphery of the magnetic shielding plate 18a to communicate with the second plate channel section 32.

[0054] When the magnetic shielding plate 18a is fixed to the axial end of the rotor body 16 during the installation of the rotor assembly 10, each of the first and second plate channel sections 30 and 32 is axially aligned with the second main channel section 22b of the corresponding one of the first and second main channels 22-1 and 22-2 in the corresponding pair of main channels 22. At the same time, the plate channel reference line T3 of the magnetic shielding plate 18a is also basically aligned with the main channel reference line L0 of the rotor body 16.

[0055] Thus, the coolant flowing out from the second main channel section 22b of each main channel 22 can reach the first and second plate channel sections 30, 32 of the corresponding second plate channel, and under the action of centrifugal force, leave the rotor assembly 10 through the first orifice 34 and the second orifice 36, so as to splash, for example, into the gap between the stator assembly and the rotor assembly 10 in the housing or other locations in the housing.

[0056] The rotor may include two identical magnetic shielding plates 18a and 18b to reduce manufacturing costs. When the two magnetic shielding plates 18a and 18b are respectively fixed to the two axial ends of the rotor body 16 during the installation of the rotor assembly 10, one of the magnetic shielding plates 18a is positioned relative to the other magnetic shielding plate 18b around the axis H of the rotor body 16 (e.g., ...). Figure 4 (as shown) rotate by a certain angle (e.g., as shown) Figure 7 As shown, the angle is 360° divided by the number of pairs of main channels 22, such that the second branch portions 26b1, 26b2 of the first and second branches of each first plate channel of one of the magnetic shielding plates 18a are axially aligned with the first and second plate channel sections 30, 32 of the corresponding second plate channel of the other magnetic shielding plate 18b. Thus, a portion of the coolant can flow from each first plate channel of one of the magnetic shielding plates 18a into the second main channel section 22b of half of the plurality of main channels 22 at one axial end of the rotor body 16, and this portion of the coolant will exit the rotor assembly 10 via the corresponding second plate channel of the other magnetic shielding plate 18b at the other axial end of the rotor body 16. Conversely, another portion of the coolant can flow from the first plate channel of the other magnetic shielding plate 18b into the second main channel section 22b of the remaining half of the plurality of main channels 22 at the other axial end of the rotor body 16, and the other portion of the coolant will exit the rotor assembly 10 via the corresponding second plate channel of the magnetic shielding plate 18a at one axial end of the rotor body 16. Thus, the coolant in half of the main channels 22 flows axially opposite to the coolant in the remaining half of the main channels 22.

[0057] Alternatively, the rotor may include two different magnetic shields. In this case, one of the magnetic shields may include only the plurality of first plate channels, while the other magnetic shield may include only the plurality of second plate channels. Second branch portions 26b1, 26b2 of the first and second branches of each first plate channel of one magnetic shield are axially aligned with the first and second plate channel sections 30, 32 of a corresponding second plate channel of the other magnetic shield, respectively. Thus, all coolant can flow from each first plate channel of one magnetic shield into the second main channel section 22b of the plurality of main channels 22 at one axial end of the rotor body 16, and exit the rotor assembly 10 via a corresponding second plate channel of the other magnetic shield at the other axial end of the rotor body 16.

[0058] Reference Figure 8 In another embodiment, when the second main channel segment 22b includes an outer sub-channel segment 22b1 and an inner sub-channel segment 22b2, the second branch portions 26b1, 26b2 of each of the first and second branches of each first plate channel may further include third branch portions 26c1, 26c2 spaced apart from the second branch portions 26b1, 26b2. In another embodiment, instead of the second branch portions 26b1, 26b2 extending from the third radius to the second radius of the first magnetic shielding plate 18a, the second branch portions 26b1, 26b2 extend from the third radius of the first magnetic shielding plate 18a to a fourth radius between the third radius and the second radius, and the third branch portions 26c1, 26c2 extend from a fifth radius of the first magnetic shielding plate 18a between the fourth radius and the second radius to the second radius. In another embodiment, instead of each second plate channel including a first aperture 34 and a second aperture 36, each first plate channel includes: a first aperture 34 extending radially inward from the outer periphery of the magnetic shielding plate 18a to communicate with a third branch portion 26c1 of the first branch; and a second aperture 36 extending radially inward from the outer periphery of the magnetic shielding plate 18a to communicate with a third branch portion 26c2 of the second branch. In another embodiment, the first and second plate channel segments 30, 32 of each second plate channel are configured as a continuous single channel.

[0059] In another embodiment, the rotor may include two identical magnetic shielding plates 18a and 18b. When the two magnetic shielding plates 18a and 18b are fixed to the two axial ends of the rotor body 16 during the installation of the rotor assembly 10, one of the magnetic shielding plates 18a rotates relative to the other magnetic shielding plate 18b about the axis H of the rotor body 16 by a certain angle (e.g., as shown in the image). Figure 8As shown, the angle is 360° divided by the number of multiple pairs of main channels 22, such that the second and third branch portions 26c1, 26c2 of the first and second branches of each first plate channel of one of the magnetic shielding plates 18a are axially aligned with the first and second plate channel sections 30, 32 of the corresponding second plate channel of the other magnetic shielding plate 18b. In this way, a portion of the coolant can flow from each first plate channel of one of the magnetic shielding plates 18a (i.e., the main trunk 24, first branch portions 26a1, 26a2 and second branch portions 26b1, 26b2 of each of the first and second branches) into the inner sub-channel section 22b2 of half of the plurality of main channels 22 at one of the axial ends of the rotor body 16, and the portion of coolant will flow into the outer sub-channel section 22b1 of the second main channel section 22b of the other half of the plurality of main channels 22 under the action of centrifugal force at the other axial end of the rotor body 16 via each second plate channel of another magnetic shielding plate 18b, and then exit the rotor assembly 10 from the third branch portions 26c1, 26c2 of each first plate channel of one of the magnetic shielding plates 18a. Another portion of the coolant can flow from each first plate channel of another magnetic shielding plate 18a (i.e., the main trunk 24, first branch portions 26a1, 26a2 and second branch portions 26b1, 26b2 of each of the first and second branches) into the inner sub-channel section 22b2 of the second main channel section 22 of the remaining half of the plurality of main channels 22 at another axial end of the rotor body 16, and another portion of the coolant will flow under centrifugal force from each second plate channel of one of the magnetic shielding plates 18a into the outer sub-channel section 22b1 of the second main channel section 22b of the remaining half of the plurality of main channels 22, and then exit the rotor assembly 10 from the third branch portions 26c1, 26c2 of each first plate channel of the other magnetic shielding plate 18b.

[0060] Alternatively, in another embodiment, the rotor may include two different magnetic shields, in which case one magnetic shield may include only the plurality of first plate channels, while the other magnetic shield may include only the plurality of second plate channels, wherein the second and third branch portions 26c1, 26c2 of the first and second branches of each first plate channel of one magnetic shield are axially aligned with the first and second plate channel sections 30, 32 of a corresponding second plate channel of the other magnetic shield. In this way, all the coolant can flow from each first plate channel of one of the magnetic shielding plates 18a (i.e., the main trunk 24, first branch portions 26a1, 26a2 and second branch portions 26b1, 26b2 of each of the first and second branches) into the inner sub-channel section 22b2 of the second main channel section 22 of the plurality of main channels 22 at one of the axial ends of the rotor body 16, and all the coolant will flow from each second plate channel of another magnetic shielding plate 18b into the outer sub-channel section 22b1 of the second main channel section 22b of the plurality of main channels 22 under the action of centrifugal force at the other axial end of the rotor body 16, and then exit the rotor assembly 10 from the third branch portions 26c1, 26c2 of each first plate channel of one of the magnetic shielding plates 18a.

[0061] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A rotor device (10), characterized in that, include: A drive shaft (12) includes a shaft channel; and A rotor, which is mounted around a drive shaft (12) and includes: The rotor body (16) includes a plurality of main channels (22) that are connected to the shaft channels and distributed along the circumferential direction of the rotor body (16), each main channel (22) including a first main channel section (22a) and a second main channel section (22b). and Multiple permanent magnets are received in a first main channel section (22a) of a corresponding main channel (22) such that the main surface of each permanent magnet faces a second main channel section (22b) of a corresponding main channel (22), and coolant flows into the second main channel section (22b) of each main channel (22) via a shaft channel to directly cool the main surface of each permanent magnet.

2. The rotor device (10) according to claim 1, characterized in that, Each main channel (22) also includes a third main channel section (22c). When each permanent magnet is received into the first main channel section (22a) of the corresponding main channel (22), the side surface of each permanent magnet faces the third main channel section (22c) of the corresponding main channel (22), and adhesive is filled into the third main channel section (22c) of each main channel (22) to securely fix each permanent magnet into the first main channel section (22a) of the corresponding main channel (22).

3. The rotor device (10) according to claim 1 or 2, characterized in that, The plurality of main channels (22) are arranged in pairs, each pair of main channels (22) including a first main channel (22-1) and a second main channel (22-2), defining a corresponding radial line of the rotor body (16) between the first main channel (22-1) and the second main channel (22-2), the first main channel (22-1) and the second main channel (22-2) gradually moving away from each other as they extend outward at an inclination relative to a corresponding radial line of the rotor body (16).

4. The rotor device (10) according to claim 3, characterized in that, The rotor also includes a magnetic shielding plate, which is fixed to the axial end of the rotor body (16) and includes a plurality of first plate channels distributed along the circumferential direction of the magnetic shielding plate. Each first plate channel includes a main trunk (24) and a first branch and a second branch extending from the main trunk (24). At least a portion of the first branch is axially aligned with the second main channel section (22b) of the first main channel (22-1) of a corresponding pair of main channels (22), and at least a portion of the second branch is axially aligned with the second main channel section (22b) of the second main channel (22-2) of a corresponding pair of main channels (22). Coolant flows into the second main channel section (22b) of each main channel (22) via the shaft channel and each first plate channel.

5. The rotor device (10) according to claim 4, characterized in that, Each of the first branch and the second branch includes a first branch portion (26a1, 26a2) extending obliquely outward from the main trunk (24) and a second branch portion (26b1, 26b2) extending smoothly from the first branch portion (26a1, 26a2). The width of the first branch portion (26a1, 26a2) is narrower than the width of the main trunk (24), and the width of the second branch portion (26b1, 26b2) is narrower than the width of the first branch portion (26a1, 26a2). The second branch portion (26b1, 26b2) of each of the first branch and the second branch is axially aligned with the second main channel segment (22b) of each of the first main channel (22-1) and the second main channel (22-2) of the corresponding pair of main channels (22).

6. The rotor device (10) according to claim 5, characterized in that, The magnetic shielding plate also includes a plurality of second plate channels that are alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section (30), a second plate channel section (32), a first orifice (34) extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the first plate channel section (30), and a second orifice (36) extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the second plate channel section (32). The rotor includes two magnetic shielding plates (18a, 18b), and the two magnetic shielding plates (18a, 18b) are respectively fixed to the two axial ends of the rotor body (16). The second branch portion (26b1, 26b2) of each of the first branch and the second branch of each of the first plate channels of one magnetic shielding plate is axially aligned with the first plate channel section (30) and the second plate channel section (32) of each of the second plate channels of the other magnetic shielding plate. Coolant flowing out from the second main channel section (22b) of each main channel (22) leaves the rotor device (10) via each second plate channel.

7. The rotor device (10) according to claim 5, characterized in that, The magnetic shield is a first magnetic shield, which is fixed to one of the axial ends of the rotor body (16). The rotor also includes a second magnetic shield fixed to the other axial end of the rotor body (16). The second magnetic shield includes a plurality of second plate channels distributed along the circumferential direction of the magnetic shield. Each second plate channel includes a first plate channel section (30), a second plate channel section (32), a first orifice (34) extending radially inward from the outer periphery of the second magnetic shield to communicate with the first plate channel section (30), and a second orifice (36) extending radially inward from the outer periphery of the second magnetic shield to communicate with the second plate channel section (32). The second branch portions (26b1, 26b2) of each of the first branches and the second branches of each first plate channel of the first magnetic shield are axially aligned with the first plate channel section (30) and the second plate channel section (32) of each second plate channel of the second magnetic shield. Coolant flowing out from the second main channel section (22b) of each main channel (22) leaves the rotor assembly (10) via each second plate channel.

8. The rotor device (10) according to claim 5, characterized in that, The second main channel segment (22b) of each of the first main channel (22-1) and the second main channel (22-2) includes a spaced-apart inner sub-channel segment (22b2) and an outer sub-channel segment (22b1), and each of the first branch and the second branch also includes a third branch portion (26c1, 26c2) spaced apart from the second branch portion (26b1, 26b2). The second branch portion (26b1, 26b2) and the third branch portion (26c1, 26c2) of each of the first branch and the second branch are respectively axially aligned with the inner sub-channel segment (22b2) and the outer sub-channel segment (22b1) of the second main channel segment (22b) of each of the first main channel (22-1) and the second main channel (22-2) of the corresponding pair of main channels (22).

9. The rotor device (10) according to claim 8, characterized in that, The magnetic shielding plate also includes a first orifice and a second orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with each of the first branch and the second branch respectively, and a plurality of second plate channels that are alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section (30) and a second plate channel section (32). The rotor includes two magnetic shielding plates (18a, 18b), and the two magnetic shielding plates (18a, 18b) are respectively fixed to the two axial ends of the rotor body (16). The second branch section (26b1, 26b2) and the third branch section (26c1, 26c2) of each of the first branch and the second branch of each of the first plate channels of one magnetic shielding plate are axially aligned with the first plate channel section (30) and the second plate channel section (32) of each of the second plate channels of the other magnetic shielding plate. Coolant flowing out from the second main channel section (22b) of each main channel (22) leaves the rotor device (10) via each first plate channel.

10. The rotor device (10) according to claim 8, characterized in that, The magnetic shielding plate also includes a first orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the third branch portion (26c1, 26c2), and a second orifice extending radially inward from the outer periphery of the magnetic shielding plate to communicate with the third branch portion (26c1, 26c2). The magnetic shielding plate is a first magnetic shielding plate, which is fixed to one axial end of the rotor body (16). The rotor also includes a second magnetic shielding plate fixed to the other axial end of the rotor body (16). The second magnetic shielding plate includes a plurality of second plate channels that are alternately distributed with the plurality of first plate channels along the circumferential direction of the magnetic shielding plate. Each second plate channel includes a first plate channel section (30) and a second plate channel section (32). The second branch portions (26b1, 26b2) and the third branch portions (26c1, 26c2) of each of the first branches and the second branches of the first plate channel of the first magnetic shielding plate are axially aligned with the first plate channel section (30) and the second plate channel section (32) of each second plate channel of the second magnetic shielding plate. Coolant flowing out from the second main channel section (22b) of each main channel (22) leaves the rotor device (10) via each first plate channel.

11. A drive motor, characterized in that, Includes the rotor device (10) according to any one of claims 1 to 10.

Images