Insulating end cover of new energy automobile motor

Abstract

The application discloses a new energy automobile motor insulating end cover, which comprises a motor end cover, an outer steel sleeve and a bearing steel sleeve, the motor end cover, the outer steel sleeve and the bearing steel sleeve are arranged in sequence in a radial direction, a gap exists between the outer steel sleeve and the bearing steel sleeve, an insulating layer is filled in the gap, and a shielding layer is arranged in the insulating layer. The insulating end cover not only has the high insulation function of a traditional insulating end cover, but also has the advantages of low cost, strong batch manufacturing process and effective blocking of low-frequency and high-frequency harmonic waves.

Description

Technical Field

[0001] This invention relates to the field of motor technology driven by frequency converters, and more specifically to an insulating end cap for a new energy vehicle motor. Background Technology

[0002] Motors driven by frequency converters, due to the non-sinusoidal output voltage of the frequency converter, exhibit rapidly changing du / dt. Given the motor's own capacitance and parasitic capacitance, according to I=C*du / dt, shaft current will be generated in the motor, leading to bearing electrolytic corrosion. Existing methods for suppressing shaft current commonly include conductive brushes and insulating end caps. Conductive brushes primarily bypass the shaft current from the bearing, but they cannot provide current bypass protection for the bearing at low motor speeds (at low speeds, the bearing oil film has not formed, and the bearing resistance is low). Traditional insulating end caps mainly employ an insulating coating process, which has disadvantages such as high cost, susceptibility to breakage and failure, complex mass production, and inability to filter high-frequency harmonics. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an insulating end cap for a new energy vehicle motor. It not only achieves the high insulation function of traditional insulating end caps, but also has the advantages of low cost, strong mass production capability, and effective blocking of low-frequency and high-frequency harmonics.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An insulating end cap for a new energy vehicle motor, comprising:

[0006] The motor end cover, outer steel sleeve, and bearing steel sleeve are arranged radially in sequence. There is a gap between the outer steel sleeve and the bearing steel sleeve. The gap is filled with an insulating layer, and a shielding layer is provided inside the insulating layer.

[0007] Furthermore, both the outer steel sleeve and the bearing steel sleeve are provided with anti-slip structures to prevent slippage.

[0008] Furthermore, both the outer ring of the outer steel sleeve and the outer ring of the bearing steel sleeve are provided with irregular structures and several first annular grooves, and the inner ring of the outer steel sleeve is provided with several second annular grooves.

[0009] Furthermore, the insulating layer is made of resin and is filled into the gap between the outer steel sleeve and the bearing steel sleeve by potting or injection molding.

[0010] Furthermore, the insulating layer completely encloses the bearing steel sleeve, thus physically isolating the bearing steel sleeve from the motor end cover and the outer steel sleeve.

[0011] Furthermore, the shielding layer is located at the radial midpoint of the insulating layer.

[0012] Furthermore, the shielding layer is made of metal and is in the form of a closed ring, with a series of through holes arranged around its circumference.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The principle structure of the insulating end cover of the present invention includes a motor end cover, an outer steel sleeve, an insulating layer, a shielding layer, a bearing steel sleeve and a bearing. The insulating layer is set by potting or injection molding resin, thereby achieving the high insulation function of the insulating end cover. It can be mass-produced, has strong processability and low cost.

[0015] 2. During operation, capacitances C1 and C2 can be formed between the outer steel sleeve, the shielding layer, and the bearing steel sleeve (e.g., ...). Figure 2 As shown in the figure, this capacitance effect has the effect of passing high frequencies and blocking low frequencies, thus suppressing related harmonics.

[0016] 3. By arranging a series of through holes circumferentially in the shielding layer (such as...) Figure 3 As shown), at high frequencies, a series of eddies will form around the through-hole (such as...). Figure 4 As shown in the figure, this allows the shielding layer to block high-frequency harmonics.

[0017] 4. By setting anti-slip structures on the outer and inner rings of the outer steel sleeve and the outer ring of the bearing steel sleeve, sliding between the outer steel sleeve and the motor end cover, the outer steel sleeve and the insulation layer, and the insulation layer and the bearing steel sleeve can be effectively prevented. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of an insulating end cap for a new energy vehicle motor.

[0020] Figure 2 A schematic diagram of the capacitance effect formed by the shielding layer and the steel sleeve;

[0021] Figure 3 This is a schematic diagram of the shielding layer structure;

[0022] Figure 4 This is a schematic diagram illustrating the high-frequency operation principle of the shielding layer.

[0023] Figure 5 This is a schematic diagram of the outer steel sleeve.

[0024] Figure 6 for Figure 5 Sectional view of AA;

[0025] Figure 7 This is a schematic diagram of the structure of the bearing steel sleeve;

[0026] Figure 8 for Figure 7 A cross-sectional view of BB.

[0027] The markings in the diagram are as follows: 1. Motor end cover; 2. Outer steel sleeve; 3. Insulation layer; 4. Shielding layer; 5. Bearing steel sleeve; 6. Bearing; 7. Through hole; 8. Irregular structure; 9. First annular groove; 10. Second annular groove. Detailed Implementation

[0028] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0030] An insulating end cap for a new energy vehicle motor, such as Figure 1 As shown, it includes:

[0031] The motor end cover 1, the outer steel sleeve 2, and the bearing steel sleeve 5 are arranged radially from the outside to the inside. There is a gap between the outer steel sleeve 2 and the bearing steel sleeve 5. The gap is filled with an insulating layer 3, and a shielding layer 4 is provided inside the insulating layer 3.

[0032] In this preferred embodiment, both the outer steel sleeve 2 and the bearing steel sleeve 5 are provided with anti-slip structures to prevent slippage.

[0033] In this embodiment, the preferred embodiment is as follows: Figure 5-8As shown, the outer ring of the outer steel sleeve 2 and the outer ring of the bearing steel sleeve 5 are both provided with irregular structures 8 and several first annular grooves 9, and the inner ring of the outer steel sleeve 2 is provided with several second annular grooves 10, thereby realizing radial and axial sliding of the outer steel sleeve 2 and the bearing steel sleeve 5.

[0034] In this embodiment, the insulating layer 3 is preferably made of resin. Specifically, a resin material with high resistance and good dimensional stability can be used, so that the insulating layer 3 has the characteristics of high structural reliability and high resistance. It is filled in the gap between the outer steel sleeve 2 and the bearing steel sleeve 5 by potting or injection molding, so that the gap is fully filled.

[0035] In this preferred embodiment, the insulating layer 3 completely wraps the bearing steel sleeve 5, so that the bearing steel sleeve 5 is completely physically isolated from the motor end cover 1 and the outer steel sleeve 2.

[0036] In this embodiment, preferably, the shielding layer 4 is located in the radial middle position of the insulating layer 3. Specifically, when the insulating layer 3 is potted or injection molded, the shielding layer 4 is first placed in the middle position of the insulating layer 3, so that in space it is arranged as outer steel sleeve 2—insulating layer 3—shielding layer 4—insulating layer 3—bearing steel sleeve 5.

[0037] In this preferred embodiment, the shielding layer 4 is made of metal and is in the form of a closed ring, and the shielding layer 4 is provided with a series of through holes 7 in the circumference.

[0038] Working principle:

[0039] 1. The principle structure of the insulating end cover of the present invention includes a motor end cover 1, an outer steel sleeve 2, an insulating layer 3, a shielding layer 4, a bearing steel sleeve 5, and a bearing 6. The insulating layer 3 is set by potting or injection molding resin, thereby achieving the high insulation function of the insulating end cover. It can be mass-produced, has strong processability, and is low in cost.

[0040] 2. When the shielding layer 4 is in operation, it can form capacitors C1 and C2 between the outer steel sleeve 2, the shielding layer 4, and the bearing steel sleeve 5 (e.g., Figure 2 As shown in the figure, this capacitance effect has the effect of passing high frequencies and blocking low frequencies, thus suppressing related harmonics.

[0041] 3. By circumferentially arranging a series of through holes 7 (e.g., ...) in the shielding layer 4 Figure 3 As shown), at high frequencies, a series of eddies will form around the through-hole 7 (such as...). Figure 4 As shown in the figure, this makes the shielding layer 4 have the effect of blocking high-frequency harmonics.

[0042] 4. By setting anti-slip structures on the outer and inner rings of the outer steel sleeve 2 and the outer ring of the bearing steel sleeve 5, the sliding between the outer steel sleeve 2 and the motor end cover 1, the outer steel sleeve 2 and the insulation layer 3, and the insulation layer 3 and the bearing steel sleeve 5 can be effectively prevented.

[0043] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An insulating end cap for a new energy vehicle motor, characterized in that, include: The motor end cover, outer steel sleeve, and bearing steel sleeve are arranged radially in sequence. There is a gap between the outer steel sleeve and the bearing steel sleeve, and the gap is filled with an insulating layer. A shielding layer is provided inside the insulating layer. The shielding layer is located in the radial middle position of the insulating layer. The outer steel sleeve and the shielding layer form a capacitor C1, and the shielding layer and the bearing steel sleeve form a capacitor C2. The shielding layer is made of metal and is in the form of a closed ring. The shielding layer has a series of through holes in its circumference.

2. The insulating end cap for a new energy vehicle motor according to claim 1, characterized in that: Both the outer steel sleeve and the bearing steel sleeve are equipped with anti-slip structures to prevent slippage.

3. The insulating end cap for a new energy vehicle motor according to claim 1, characterized in that: The outer ring of the outer steel sleeve and the outer ring of the bearing steel sleeve are both provided with irregular structures and several first annular grooves, and the inner ring of the outer steel sleeve is provided with several second annular grooves.

4. The insulating end cap for a new energy vehicle motor according to claim 1, characterized in that: The insulating layer is made of resin and is filled into the gap between the outer steel sleeve and the bearing steel sleeve by potting or injection molding.

5. The insulating end cap for a new energy vehicle motor according to claim 4, characterized in that: The insulating layer completely encloses the bearing steel sleeve, thus physically isolating the bearing steel sleeve from the motor end cover and the outer steel sleeve.

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