End plate assembly and drive motor

Abstract

This utility model relates to the field of drive motor technology, and discloses an end plate device and a drive motor. The end plate device includes a first end plate and a second end plate. The first end plate is made of a magnetically conductive material and is disposed at the end of the rotor of the drive motor. The second end plate is made of a non-conductive material and is disposed at the end of the rotor of the drive motor. The first end plate is located between the second end plate and the rotor. The end plate device provided by this utility model can guide the magnetic lines of force to close inside the rotor, reducing the magnetic field leaking to the outside of the rotor. This reduces the impact of magnetic leakage at the rotor end on structural components such as bearings and position sensors, and has the functions of improving bearing life, improving EMC, reducing motor running resistance, and improving motor efficiency.

Description

Technical Field

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

[0002] With the rapid development of the new energy vehicle industry, electric drive systems, such as motors, as the core power units of new energy vehicles, have become the mainstream trend in the technological development of electric drive systems due to their significant advantages in performance, cost, and space optimization through extreme integration and compact design. However, because permanent magnet synchronous motor rotors inevitably have end magnetic leakage problems, and the compact design results in bearings, position sensors, and other structural components being close to the rotor, these structural components are affected by magnetic leakage. Utility Model Content

[0003] In view of this, the present invention provides an end plate device and a drive motor to solve the problem of the impact of rotor end magnetic leakage on structural components such as bearings and position sensors.

[0004] In a first aspect, this utility model provides an end plate device, comprising:

[0005] The first end plate is made of magnetically conductive material and is disposed at the end of the rotor of the drive motor;

[0006] The second end plate, made of a non-conductive material, is disposed at the end of the rotor of the drive motor, and the first end plate is located between the second end plate and the rotor.

[0007] Beneficial effects: The first end plate is made of a magnetically conductive material with high permeability and low magnetic reluctance; the second end plate is made of a non-magnetically conductive material with low permeability and high magnetic reluctance. The second end plate is used to ensure the dynamic balance of the rotor and enhance the stability and lifespan of the rotor at high speeds. According to the principle of minimum magnetic reluctance, the first end plate can guide the magnetic lines of force to close inside the rotor, reducing the magnetic field leaking to the outside of the rotor. This reduces the impact of leakage magnetic field at the rotor end on structural components such as bearings and position sensors, and has the effects of improving bearing life, improving EMC, reducing motor running resistance, and improving motor efficiency.

[0008] In one alternative embodiment, the end plate assembly further includes a third end plate made of a non-magnetic material, the third end plate being disposed at the end of the rotor of the drive motor, the third end plate being disposed between the first end plate and the rotor.

[0009] Beneficial effects: A third end plate, made of non-magnetic material, is positioned between the first end plate and the rotor. This axially separates the rotor from the first end plate, allowing leakage magnetic flux from the rotor end to bypass the third end plate and form a closed magnetic field loop with the first end plate. This significantly reduces magnetic leakage, thereby minimizing the impact of rotor end leakage on bearings, position sensors, and other structural components. This improves bearing life, EMC, reduces motor operating resistance, and increases motor efficiency. Compared to the first end plate being directly adjacent to the rotor end, the third end plate avoids the increased magnetic leakage and reduced main magnetic flux that might result from direct proximity, preventing any impact on motor output performance.

[0010] In one alternative embodiment, the third end plate abuts against the first end plate at one end in the axial direction and against the end of the rotor at the other end.

[0011] In one alternative embodiment, the first end plate abuts against the third end plate at one end in the axial direction and against the second end plate at the other end.

[0012] In one alternative embodiment, the first thickness t1 of the first end plate in the axial direction satisfies 0.5mm≤t1≤5mm.

[0013] In one alternative embodiment, the second thickness t2 of the second end plate in the axial direction satisfies 3mm≤t2≤8mm.

[0014] In one optional embodiment, the third thickness t3 of the third end plate in the axial direction satisfies 0.5mm≤t3≤5mm.

[0015] Secondly, this utility model also provides a drive motor, comprising:

[0016] Rotor;

[0017] The aforementioned end plate device is connected to the end of the rotor.

[0018] In one alternative embodiment, the drive motor further includes a shaft connected to the rotor, and the end plate device is interference-fitted with the shaft.

[0019] In one alternative embodiment, the end plate assembly is fastened to the end of the rotor by fasteners. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a partial structural schematic diagram of a drive motor according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of an end plate device for a drive motor according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First end plate; 2. Second end plate; 3. Third end plate; 4. Rotor; 5. Shaft. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] With the rapid development of the new energy vehicle industry, electric drive systems, such as motors, as the core power units of new energy vehicles, have become the mainstream trend in the technological development of electric drive systems due to their significant advantages in performance, cost, and space optimization through extreme integration and compact design. However, due to the unavoidable end magnetic leakage problem of the permanent magnet synchronous motor rotor 4, and the compact design resulting in the close proximity of structural components such as bearings and position sensors to the rotor 4, these structural components are affected by magnetic leakage. For example, the end magnetic leakage of the rotor 4 can magnetize the bearings, causing the bearings to attract foreign objects, increasing resistance, reducing lifespan, and also affecting motor efficiency; the stray magnetic field formed by the leakage magnetic field may interfere with sensors near the motor (such as position sensors and current sensors), causing signal distortion and electromagnetic compatibility issues; the leakage magnetic field from the rotating rotor 4 can also generate eddy current losses in stationary magnetically conductive structural components (such as steel bearing plates and steel pressure rings), leading to increased motor operating resistance and reduced efficiency.

[0027] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, an end plate device is provided, including a first end plate 1 and a second end plate 2. The first end plate 1 is made of a magnetically conductive material and is disposed at the end of the rotor 4 of the drive motor. The second end plate 2 is made of a non-conductive material and is disposed at the end of the rotor 4 of the drive motor. The first end plate 1 is located between the second end plate 2 and the rotor 4.

[0029] The first end plate 1 is made of a magnetically conductive material with high permeability and low magnetic reluctance; the second end plate 2 is made of a non-magnetically conductive material with low permeability and high magnetic reluctance. The second end plate 2 is used to ensure the dynamic balance of the rotor 4 and enhance the stability and lifespan of the rotor 4 at high speeds. According to the principle of minimum magnetic reluctance, the first end plate 1 can guide the magnetic lines of force to close inside the rotor 4, reducing the magnetic field leaking to the outside of the rotor 4. This reduces the impact of magnetic leakage at the end of the rotor 4 on structural components such as bearings and position sensors, and has the functions of improving bearing life, improving EMC, reducing motor running resistance, and improving motor efficiency.

[0030] Specifically, EMC, or electromagnetic compatibility, refers to the ability of a device to generate electromagnetic energy that neither interferes with other devices nor is interfered with by the electromagnetic energy of other devices.

[0031] In a specific implementation, magnetic leakage at the end of rotor 4 can magnetize the bearing, causing the bearing to attract foreign objects, increasing resistance, reducing lifespan, and also affecting motor efficiency. Therefore, in this embodiment, by setting the first end plate 1, according to the principle of minimum magnetic reluctance, the first end plate 1 can guide the magnetic lines of force to close inside rotor 4, reducing the magnetic field leaking to the outside of rotor 4, thereby reducing the probability of magnetic leakage at the end of rotor 4 causing bearing magnetization, and thus reducing the possibility of bearing attracting foreign objects, avoiding increased resistance due to attracting foreign objects, and preventing reduced lifespan.

[0032] In a specific implementation, since the stray magnetic field formed by leakage magnetic field may interfere with sensors near the motor (such as position sensors, current sensors, etc.), resulting in signal distortion and electromagnetic compatibility problems, in this embodiment, by setting the first end plate 1, according to the principle of minimum magnetic reluctance, the first end plate 1 can guide the magnetic lines of force to close inside the rotor 4, reducing the magnetic field leaking to the outside of the rotor 4, thereby reducing the probability of the stray magnetic field formed by leakage magnetic field interfering with the sensors near the motor, avoiding sensor signal distortion caused by the stray magnetic field formed by leakage magnetic field, and avoiding electromagnetic compatibility problems.

[0033] In a specific implementation, since the leakage magnetic field of the rotating rotor 4 will also generate eddy current losses in the stationary magnetic conductive structural components (such as steel bearing pressure plates, steel pressure rings, etc.), the motor running resistance will increase and the efficiency will decrease. Therefore, in this embodiment, by setting the first end plate 1, according to the principle of minimum magnetic reluctance, the first end plate 1 can guide the magnetic lines of force to close inside the rotor 4, reduce the magnetic field leaking to the outside of the rotor 4, and avoid the leakage magnetic field of the rotating rotor 4 from generating eddy current losses in the stationary magnetic conductive structural components (such as steel bearing pressure plates, steel pressure rings, etc.), thereby avoiding the increase in the running resistance of the drive motor and the decrease in efficiency.

[0034] In one embodiment, the end plate device further includes a third end plate 3 made of a non-magnetic material, the third end plate 3 being disposed at the end of the rotor 4 of the drive motor, and the third end plate 3 being disposed between the first end plate 1 and the rotor 4.

[0035] A third end plate 3 is disposed between the first end plate 1 and the rotor 4. The third end plate 3 is made of a non-magnetic material, which spatially separates the rotor 4 from the first end plate 1 in the axial direction. This allows the magnetic flux leaking from the end of the rotor 4 to bypass the third end plate 3 and form a closed magnetic field loop with the first end plate 1, resulting in better reduction of magnetic leakage. This, in turn, reduces the impact of magnetic leakage at the end of the rotor 4 on structural components such as bearings and position sensors, thus improving bearing life, EMC, motor operating resistance, and motor efficiency. Compared to the first end plate 1 being directly close to the end of the rotor 4, the third end plate 3 avoids the potential for increased magnetic leakage and reduced main magnetic flux that might result from direct contact between the first end plate 1 and the end of the rotor 4, preventing any impact on motor output performance.

[0036] In a specific implementation, the first end plate 1 is made of a magnetically conductive material, preferably a soft magnetic material, such as silicon steel, amorphous material, iron-cobalt-vanadium alloy, etc., which has a relatively high magnetic permeability and low magnetic resistance.

[0037] In a specific implementation, the second end plate 2 is made of a non-magnetic material with a relative permeability close to that of air and a relatively large magnetic resistance, such as aluminum or austenitic stainless steel (e.g., 304, 316, etc.).

[0038] In a specific implementation, the third end plate 3 is made of a non-magnetic material with a relative permeability close to that of air and a relatively large magnetic resistance, such as aluminum or austenitic stainless steel (e.g., 304, 316, etc.).

[0039] In one embodiment, the third end plate 3 abuts against the first end plate 1 at one end in the axial direction and against the end of the rotor 4 at the other end.

[0040] The third end plate 3 and the first end plate 1 are designed to be compact at the ends of the rotor 4 to avoid taking up too much space.

[0041] In one embodiment, the first end plate 1 abuts against the third end plate 3 at one end in the axial direction and against the second end plate 2 at the other end.

[0042] The third end plate 3, the first end plate 1, and the second end plate 2 abut together to form a compact end plate device that occupies little space.

[0043] In one embodiment, the first thickness t1 of the first end plate 1 in the axial direction satisfies 0.5mm≤t1≤5mm.

[0044] The first thickness of the first end plate 1 can be designed and optimized based on the leakage magnetic flux.

[0045] In one specific embodiment, the first thickness t1 of the first end plate 1 in the axial direction is 0.5 mm.

[0046] In another specific embodiment, the first end plate 1 has a first thickness t1 in the axial direction of 5 mm.

[0047] In another specific embodiment, the first end plate 1 has a first thickness t1 in the axial direction of 2.75 mm.

[0048] In one embodiment, the second thickness t2 of the second end plate 2 in the axial direction satisfies 3mm≤t2≤8mm.

[0049] The second thickness of the second end plate 2 can be optimized according to the dynamic balance design of the motor.

[0050] In one specific embodiment, the second thickness t2 of the second end plate 2 in the axial direction is 3 mm.

[0051] In another specific embodiment, the second thickness t2 of the second end plate 2 in the axial direction is 8 mm.

[0052] In another specific embodiment, the second thickness t2 of the second end plate 2 in the axial direction is 5.5 mm.

[0053] In one embodiment, the third thickness t3 of the third end plate 3 in the axial direction satisfies 0.5mm≤t3≤5mm.

[0054] The third thickness of the third end plate 3 can be designed and optimized according to the leakage magnetic flux.

[0055] In one specific embodiment, the third thickness t3 of the third end plate 3 in the axial direction is 0.5 mm.

[0056] In another specific embodiment, the third thickness t3 of the third end plate 3 in the axial direction is 5 mm.

[0057] In another specific embodiment, the third end plate 3 has a third thickness t3 in the axial direction of 2.75 mm.

[0058] According to an embodiment of the present invention, another aspect provides a drive motor, including a rotor 4 and the aforementioned end plate device, the end plate device being connected to the end of the rotor 4.

[0059] The first end plate 1 of the end plate assembly is made of a magnetically conductive material with high permeability and low magnetic reluctance; the second end plate 2 is made of a non-magnetically conductive material with low permeability and high magnetic reluctance. The second end plate 2 is used to ensure the dynamic balance of the rotor 4 and enhance the stability and lifespan of the rotor 4 at high speeds. According to the principle of minimum magnetic reluctance, the first end plate 1 can guide the magnetic lines of force to close inside the rotor 4, reducing the magnetic field leaking to the outside of the rotor 4, thereby reducing the impact of magnetic leakage at the end of the rotor 4 on structural components such as bearings and position sensors. It has the functions of improving bearing life, improving EMC, reducing motor running resistance, and improving motor efficiency.

[0060] In one embodiment, the drive motor further includes a rotating shaft 5, which is connected to the rotor 4, and the end plate device is interference-fitted with the rotating shaft 5.

[0061] The end plate assembly is interference-fitted with the rotating shaft 5, which can effectively fix the end plate assembly.

[0062] In one embodiment, the end plate assembly is fastened to the end of the rotor 4 by fasteners.

[0063] The end plate assembly is fastened to the end of the rotor 4 with fasteners, which facilitates disassembly and assembly.

[0064] Fasteners can be bolts or screws or other fastening structures.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An end plate device, characterized in that, include: The first end plate (1) is made of magnetic material and is disposed at the end of the rotor (4) of the drive motor. The second end plate (2) is made of a non-conductive material and is disposed at the end of the rotor (4) of the drive motor. The first end plate (1) is located between the second end plate (2) and the rotor (4).

2. The end plate device according to claim 1, characterized in that, It also includes a third end plate (3) made of non-magnetic material, the third end plate (3) being disposed at the end of the rotor (4) of the drive motor, the third end plate (3) being disposed between the first end plate (1) and the rotor (4).

3. The end plate device according to claim 2, characterized in that, The third end plate (3) abuts against the first end plate (1) at one end in the axial direction and against the end of the rotor (4) at the other end.

4. The end plate device according to claim 2, characterized in that, The first end plate (1) abuts against the third end plate (3) at one end in the axial direction and against the second end plate (2) at the other end.

5. The end plate device according to any one of claims 1 to 4, characterized in that, The first thickness t1 of the first end plate (1) in the axial direction satisfies 0.5mm≤t1≤5mm.

6. The end plate device according to any one of claims 1 to 4, characterized in that, The second thickness t2 of the second end plate (2) in the axial direction satisfies 3mm≤t2≤8mm.

7. The end plate device according to any one of claims 2 to 4, characterized in that, The third thickness t3 of the third end plate (3) in the axial direction satisfies 0.5mm≤t3≤5mm.

8. A drive motor, characterized in that, include: Rotor (4); The end plate device according to any one of claims 1 to 7, wherein the end plate device is connected to the end of the rotor (4).

9. The drive motor according to claim 8, characterized in that, It also includes a rotating shaft (5), which is connected to the rotor (4), and the end plate device is interference-fitted with the rotating shaft (5).

10. The drive motor according to claim 8, characterized in that, The end plate assembly is fastened to the end of the rotor (4) by fasteners.

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