Rotating electric machine

Abstract

The invention discloses a rotating motor, and relates to the technical field of motors. The motor can fully utilize the end part structure of the stator core to gather magnetism, and is beneficial for improving the output torque of the motor, reducing the loss of the motor and improving the efficiency of the motor under the same volume. The motor comprises a housing assembly, a stator, a rotor and a rotating shaft. The stator is fixedly connected to the inner wall of the machine shell assembly. The rotor is rotationally connected into the machine shell assembly through a rotating shaft. The stator comprises a stator core and a stator winding; the stator iron core comprises two magnetism gathering iron cores which are arranged in a back-to-back mode. The magnetism gathering iron core comprises an annular body section and a magnetism gathering section located at the end of the annular body section. The magnetism gathering section is an annular protrusion extending in the axial direction of the annular body section. The wall thickness of the annular protrusion is smaller than that of the annular body section, and the inner diameter of the annular protrusion is equal to that of the annular body section. A winding groove is formed in the magnetism gathering iron core; the stator winding is embedded in the winding groove of the stator core and is positioned on the outer side of the annular bulge; the magnetism gathering iron core is made of SMC soft magnetic composite materials.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a rotating motor. Background Art

[0002] With the rapid development of the new energy vehicle industry, a new round of motor innovation has been triggered. New energy vehicle drive motors strive to pursue high power density, high efficiency, high reliability, and high mileage, and many research institutions have conducted research on this. Figure 1 The existing rotating motor includes a housing assembly and a stator and a rotor arranged in the housing. Among them, the housing assembly includes a housing 01 and an end cover 02 arranged at the housing mouth. The stator includes a stator core 03 and a stator winding 04. The stator core 03 is fixedly connected to the inner wall of the housing. The rotor 05 is sleeved on the rotating shaft 06, and the two ends of the rotating shaft 06 are connected to the central hole of the housing assembly through bearings 07. Therefore, the torque can be transmitted through the mutual electromagnetic action between the stator and the rotor. However, since the stator core 03 in the existing rotating motor is stamped and stacked by electrical silicon steel sheets, the stator winding 04 is embedded in the winding slot of the stator core 03, and the axial length is greater than the length of the stator core 03, the existing rotating motor is large in size, has a small output torque, and has a low efficiency. Summary of the invention

[0003] An embodiment of the present application provides a rotating motor that can fully utilize the end structure of the stator core for magnetic field concentration, which helps to increase the output torque of the motor, reduce the loss of the motor, and improve the efficiency of the motor under the same volume.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides a rotating electric machine, including a casing assembly, a stator, a rotor and a rotating shaft; the stator is fixedly connected to the inner wall of the casing assembly; the rotor is rotatably connected to the casing assembly through the rotating shaft; the stator includes a stator core and a stator winding; the stator core includes two back-to-back arranged magnetic cores; the magnetic core includes an annular body section and a magnetic segment located at the end of the annular body section; the magnetic segment is an annular protrusion extending axially along the annular body section; the inner diameter of the annular protrusion is equal to the inner diameter of the annular body section; a winding groove is provided in the magnetic core; the stator winding is embedded in the winding groove of the stator core and is located on the outside of the annular protrusion; the magnetic core is made of SMC soft magnetic composite material.

[0005] Furthermore, the stator core also includes an intermediate core arranged between the two magnetic cores; the intermediate core is formed by stamping and stacking electrical silicon steel sheets.

[0006] Furthermore, the winding groove is an open groove that penetrates the annular body section in the axial direction; and the annular protrusion is provided with a notch that penetrates in both the axial direction and the radial direction.

[0007] Furthermore, the two magneto-magnetic cores are fixedly connected as an integral piece; and the winding groove is a closed groove that axially passes through the two annular body segments.

[0008] Furthermore, a sealing structure is provided in the casing assembly; the sealing structure, the stator core and the casing assembly together form a sealed oil chamber; an oil inlet and an oil outlet are provided on the side wall of the sealed oil chamber; an intermediate first oil guide ring chamber and an intermediate second oil guide ring chamber are provided in the magnetic core; the intermediate first oil guide ring chamber is communicated with the oil inlet and the intermediate second oil guide ring chamber respectively; the intermediate second oil guide ring chamber is communicated with the winding groove through the oil guide groove.

[0009] Furthermore, the sealing structure includes an annular sealing plate arranged at both ends of the stator; the side of the annular sealing plate close to the annular protrusion protrudes inward to form a supporting portion; the outer diameter of the supporting portion is adapted to the inner diameter of the annular protrusion, the supporting portion extends into the annular protrusion and the supporting portion and the annular protrusion are sealed by a first sealing member; the outer diameter of the annular sealing plate is adapted to the inner diameter of the casing assembly, and the annular sealing plate and the casing assembly are sealed by a second sealing member.

[0010] Furthermore, the casing assembly includes a casing and an end cover arranged at the casing opening; the oil inlet and the oil outlet are both arranged on the casing, and the oil inlet is located at the top and the oil outlet is located at the bottom.

[0011] Furthermore, there are two oil outlets.

[0012] Furthermore, the oil guiding groove is provided on two groove walls of the closed groove extending in the radial direction.

[0013] Furthermore, the oil guide groove is provided on a groove wall on a side of the closed groove away from the rotor.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. The rotating motor in the embodiment of the present application adopts SMC soft magnetic composite material to make two magnetic cores of the stator core, and an axially protruding magnetic core section is provided at the end of the magnetic core, so as to make full use of the space at the end of the motor winding and the performance of the 3D magnetic circuit of the SMC soft magnetic composite material to concentrate the magnetic flux from the rotor side, thereby increasing the output torque of the motor, reducing the loss of the motor and improving the efficiency of the motor without changing the volume of the motor.

[0016] 2. The rotating motor in the embodiment of the present application utilizes the convenient molding feature of SMC soft magnetic composite materials. By adopting a closed slot structure for the winding slots of the stator core and arranging an entrance of the cooling oil channel in the middle position of the stator core, the cooling oil channel can enter from the middle position and then enter the winding ends on both sides respectively. A sealing structure is arranged at the end through the axial protrusion of the stator core, so that the sealing structure, the stator core, and the casing assembly together form a sealed oil chamber, thereby realizing oil immersion cooling of the end winding, improving the continuous power of the motor, and improving the ratio of continuous power to peak power.

[0017] 3. The stator core in the rotating motor in the embodiment of the present application is made of SMC soft magnetic composite material and pressed through powder metallurgy technology. This material has the advantage of effectively reducing high-frequency and eddy current losses, which helps to improve the efficiency of the motor at high speed; this manufacturing technology has the advantages of high material utilization, convenient manufacturing and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the structure of a rotating electrical machine using a conventional stator core;

[0020] Figure 2 This is a schematic diagram of the structure of Example 1 of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of the magnetic core in Example 1 of the present application;

[0022] Figure 4 for Figure 3 A partial enlarged view of point Ⅰ in the middle;

[0023] Figure 5 This is a schematic diagram of the structure of Example 2 of the present application;

[0024] Figure 6 It is a structural schematic diagram of a traditional stator assembly;

[0025] Figure 7 It is a schematic diagram of the structure of the connection between the traditional stator core and the stator winding;

[0026] Figure 8 This is a schematic diagram of the structure of the stator in Example 3 of the present application;

[0027] Fig. 9This is a schematic structural diagram of the stator core of Example 3 of the present application;

[0028] Fig.10 for Fig. 9 A partial enlarged view of the middle II;

[0029] Fig.11 This is a schematic diagram of the structure of Example 4 of the present application;

[0030] Fig.12 This is a schematic diagram of the structure of the stator in Example 4 of the present application;

[0031] Fig.13 is a cross-sectional view of the stator in Example 4 of the present application;

[0032] Fig.14 This is a schematic structural diagram of the stator core in Example 4 of the present application;

[0033] Fig.15 is a cross-sectional view of the stator core in Example 4 of the present application;

[0034] Fig.16 for Fig.15 A partial enlarged view of the middle part III;

[0035] Fig.17 is a cross-sectional view of the stator in Example 5 of the present application;

[0036] Fig.18 This is a schematic diagram of the structure of the connection between the stator core and the stator winding in Example 5 of the present application;

[0037] Fig.19 This is a schematic diagram of the structure of the connection between the stator core and the stator winding in Example 6 of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" can explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] Embodiment 1:

[0043] Reference Figures 2 to 4 An embodiment of the present application provides a rotating electrical machine, including a housing assembly 1, a stator, a rotor 2 and a rotating shaft 3.

[0044] The housing assembly 1 comprises a housing 11 and an end cover 12 disposed at the right end of the housing 11. The stator is fixedly connected to the inner wall of the housing 11. The rotor 2 is sleeved on the rotating shaft 3, and both ends of the rotating shaft 3 are connected to the central hole of the housing assembly 1 through bearings 6.

[0045] The stator includes a stator core 4 and a stator winding 5. The stator core 4 includes two magneto-magnetic cores 41 disposed in back-to-back relation. The magneto-magnetic core 41 includes an annular main body section 411 and a magneto-magnetic section 412 located at the end of the annular main body section 411. The magneto-magnetic section 412 is an annular protrusion extending axially along the annular main body section 411. The annular protrusion is annular and the inner diameter of the annular protrusion is equal to the inner diameter of the annular main body section 411. A plurality of winding grooves 413 and notches 415 evenly distributed along the circumferential direction are provided in the magneto-magnetic core 41, and the wall thickness of the annular protrusion is smaller than the height of the notch 415 on the annular main body section 411. The stator winding 5 is embedded in the winding grooves 413 of the stator core 4 and is located on the outside of the annular protrusion. The winding groove 413 is an open groove, which axially penetrates the annular body section 411. The shape of the open groove is similar to that of a conventional winding groove, and the opening faces the axis of the annular body section 411. The notch 415 axially penetrates the annular body section 411 and the magnetic field collecting section 412, and radially penetrates the magnetic field collecting section 412, i.e., an annular protrusion. In addition, the width of the notch 415 can be equal to the width of the winding groove 413, or can be less than the width of the winding groove 413, which is not limited here.

[0046] The magnet core 41 is made of SMC soft magnetic composite material. SMC soft magnetic composite material is easy to shape, and it is easy to arrange the cooling oil channel, thereby making oil immersion cooling possible. In addition, SMC soft magnetic composite material can also effectively reduce high-frequency and eddy current losses, which helps to improve the efficiency of the motor at high speed. Powder metallurgy technology is used to press it into the final stator core shape, which has the advantages of high material utilization, convenient manufacturing and low cost.

[0047] It should be noted that the stator core 4 can be an integral part, or two magnetic cores 41 can be processed separately and then fixed together as a whole. In order to reduce the difficulty of processing, this embodiment adopts the latter processing method.

[0048] In this embodiment, the length of the rotor 2 is equal to the length of the two magnetic cores 41, that is, twice the sum of the lengths of the annular body section 411 and the magnetic focusing section 412. Therefore, since the length of the rotor 2 is greater than the lengths of the two annular body sections 411, the magnetic flux in the extra axial length of the rotor 2 is gathered through the magnetic focusing section 412, that is, the axial protrusion at the end of the stator, thereby improving the torque of the motor.

[0049] Embodiment 2:

[0050] Reference Figures 5 to 7 , the difference between Example 2 and Example 1 is only that:

[0051] The stator core 4 in Example 2 also includes an intermediate core 42 disposed between the two magnetic concentrator cores 41. The intermediate core 42 is formed by stamping and stacking electrical silicon steel sheets, and the stator winding 5 is also embedded in the winding slots of the intermediate core 42. That is, the stator core 4 in Example 2 is a three-section structure, with the traditional stator core stacked by silicon steel sheets located in the middle, and the stator cores made of SMC soft magnetic composite materials located on both sides. Since the intermediate core 42 is an existing traditional stator core, its structure and working principle will not be described in detail here.

[0052] Embodiment 3:

[0053] Reference Figures 8 to 10 , the difference between Example 3 and Example 1 is only that:

[0054] The winding groove 413 in the third embodiment is a closed groove that penetrates the annular body section 411 axially, that is, the closed groove is a rectangular groove that penetrates axially and is radially closed.

[0055] Embodiment 4:

[0056] Reference Fig.11In order to achieve oil immersion cooling, an embodiment of the present application provides a rotating electrical machine, including a housing assembly 1, a stator, a rotor 2, a rotating shaft 3, a bearing 6 and a sealing structure 7. The structures and connection relationships of the housing assembly 1, the stator, the rotor 2, the rotating shaft 3 and the bearing 6 are the same as those of Embodiment 1.

[0057] The sealing structure 7 is arranged in the casing assembly 1. The sealing structure 7 includes two annular sealing plates 71, two first sealing members 72 and two second sealing members 73. The two annular sealing plates 71 are respectively arranged at the two ends of the stator core 4. The inner side of the annular sealing plate 71, that is, the side close to the magnetic focusing section 412, protrudes inward to form a support portion 711. The outer diameter of the support portion 711 is adapted to the inner diameter of the magnetic focusing section 412, the support portion 711 extends into the magnetic focusing section 412, and the support portion 711 and the magnetic focusing section 412 are sealed by the first sealing member 72. The outer diameter of the annular sealing plate 71 is adapted to the inner diameter of the casing assembly 1, and the annular sealing plate 71 and the casing assembly 1 are sealed by the second sealing member 73. Thus, the sealing structure 7, the stator core 4 and the casing assembly 1 together form a sealed oil chamber 8. An oil inlet 81 and two oil outlets 82 are provided on the side wall of the sealed oil chamber 8. The oil inlet 81 is located at the middle of the top, and the two oil outlets 82 are located at the bottom near the two ends.

[0058] Reference Figures 11 to 16 The stator core 4 in the fourth embodiment differs from the stator core 4 in the first embodiment only in that:

[0059] The winding groove 413 in Example 4 is a closed groove that axially penetrates the two annular body sections 411, that is, a rectangular groove that axially penetrates and is radially closed. In other words, the annular protrusion in Example 4 is a circular ring without a notch. An intermediate first oil guide ring cavity 43 and an intermediate second oil guide ring cavity 44 are provided in the stator core 4. Among them, the intermediate first oil guide ring cavity 43 is located at the outer periphery of the intermediate second oil guide ring cavity 44. An intermediate first oil guide ring cavity oil inlet 431 is provided on the outer wall of the intermediate first oil guide ring cavity 43, and four intermediate first oil guide ring cavity oil outlets 432 are provided on the inner wall. The intermediate first oil guide ring cavity oil inlet 431 is located in the middle position of the stator core 4. The four intermediate first oil guide ring cavity oil outlets 432 are evenly distributed along the circumference of the stator core 4. The oil inlet 431 of the first middle oil guide ring cavity is communicated with the oil inlet 81 on the side wall of the sealing oil cavity 8, the oil outlet 432 of the first middle oil guide ring cavity is communicated with the second middle oil guide ring cavity 44, and the second middle oil guide ring cavity 44 is communicated with the winding groove 413 through the oil guide groove 414. The oil guide groove 414 is provided on the groove wall of the closed groove away from the rotor 2. Thus, the strength of the stator core 4 can be ensured.

[0060] It should be noted that, for the sake of ease of processing, the stator core 4 is formed by reprocessing the two already processed magnetic cores 41 into a whole, that is, the two magnetic cores 41 are sealed and connected as a whole. Therefore, even if an oil guide ring cavity is opened inside the stator core 4 and an oil inlet is opened in the middle of the side wall, oil leakage will not occur.

[0061] Embodiment 5:

[0062] Reference Fig.17 and Fig.18 , the difference between Example 5 and Example 4 is only that:

[0063] The oil guide groove 414 is formed on two groove walls of the closed groove extending in the radial direction and is arranged away from the rotor 2 .

[0064] Embodiment 6:

[0065] Reference Fig.19 The difference between Example 6 and Example 5 is only that:

[0066] The oil guide groove 414 is one and is opened on one of the groove walls extending in the radial direction of the closed groove.

[0067] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A rotating electrical machine, characterized in that: It includes a casing assembly, a stator, a rotor and a rotating shaft; the stator is fixedly connected to the inner wall of the casing assembly; the rotor is rotatably connected to the casing assembly through the rotating shaft; the stator includes a stator core and a stator winding; the stator core includes two magnetoelectric cores arranged back to back; the magnetoelectric core includes an annular body section and a magnetoelectric section located at the end of the annular body section; the magnetoelectric section is an annular protrusion extending axially along the annular body section; the inner diameter of the annular protrusion is equal to the inner diameter of the annular body section; a winding groove is provided in the magnetoelectric core; the stator winding is embedded in the winding groove of the stator core and is located on the outside of the annular protrusion; the magnetoelectric core is made of SMC soft magnetic composite material.

2. The rotating electrical machine according to claim 1, characterized in that: The stator core also includes an intermediate core arranged between the two magnetic cores; the intermediate core is formed by stamping and stacking electrical silicon steel sheets.

3. The rotating electrical machine according to claim 1 or 2, characterized in that: The winding groove is an open groove that axially penetrates the annular body segment; the annular body segment and the annular protrusion are also provided with axially penetrating notches, and the notches located in the annular body segment are connected to the open groove.

4. The rotating electrical machine according to claim 1, characterized in that: The two magneto-magnetic cores are fixedly connected as an integral piece; the winding groove is a closed groove which axially passes through the two annular body segments.

5. The rotating electrical machine according to claim 4, characterized in that: A sealing structure is provided in the casing assembly; the sealing structure, the stator core and the casing assembly together form a sealed oil chamber; an oil inlet and an oil outlet are provided on the side wall of the sealed oil chamber; a first intermediate oil guide ring chamber and a second intermediate oil guide ring chamber are provided in the magnetic core; the first intermediate oil guide ring chamber is communicated with the oil inlet and the second intermediate oil guide ring chamber respectively; the second intermediate oil guide ring chamber is communicated with the winding groove through the oil guide groove.

6. The rotating electrical machine according to claim 5, characterized in that The sealing structure includes an annular sealing plate arranged at both ends of the stator; one side of the annular sealing plate close to the annular protrusion protrudes inward to form a supporting portion; the outer diameter of the supporting portion is adapted to the inner diameter of the annular protrusion, the supporting portion extends into the annular protrusion and the supporting portion and the annular protrusion are sealed by a first sealing member; the outer diameter of the annular sealing plate is adapted to the inner diameter of the casing assembly, and the annular sealing plate and the casing assembly are sealed by a second sealing member.

7. The rotating electrical machine according to claim 6, characterized in that The casing assembly comprises a casing and an end cover arranged at the casing opening; the oil inlet and the oil outlet are both arranged on the casing, with the oil inlet located at the top and the oil outlet located at the bottom.

8. The rotating electrical machine according to claim 7, characterized in that There are two oil outlets.

9. The rotating electrical machine according to claim 5, characterized in that The oil guide groove is disposed on one or two groove walls of the closed groove extending in the radial direction.

10. The rotating electrical machine according to claim 5, characterized in that The oil guide groove is arranged on a groove wall of the closed groove on one side away from the rotor.

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