CN110601464A - Method for reducing noise of chamfer angle of stator tooth shoulder of alternating-current traction motor based on inscribed arc - Google Patents
Method for reducing noise of chamfer angle of stator tooth shoulder of alternating-current traction motor based on inscribed arc Download PDFInfo
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- CN110601464A CN110601464A CN201910988810.5A CN201910988810A CN110601464A CN 110601464 A CN110601464 A CN 110601464A CN 201910988810 A CN201910988810 A CN 201910988810A CN 110601464 A CN110601464 A CN 110601464A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses an inscribed arc-based method for reducing noise of a chamfer of a stator tooth shoulder of an alternating-current traction motor, which comprises the following steps of: taking the vertex of the stator tooth shoulder angle as an end point, taking two points at equal distance along two side edges of the stator tooth shoulder angle from the end point according to a certain length, taking the two points as tangent points D1 and D2 of an inscribed circular arc, then taking the two tangent points D1 and D2 as the inscribed circular arc of the tooth shoulder angle, and cutting off the tooth shoulder angle along the inscribed circular arc. The invention aims at the tooth shoulders on the two sides of the stator tooth part of the alternating-current traction motor, the tooth shoulder angles close to the rotor side are cut off in an inscribed circular arc mode, and under the condition of basically not influencing other performances of the motor, the magnetic conductivity mutation from the tooth shoulders of the motor stator to the slot of the stator can be effectively slowed down, so that the amplitude of low-order electromagnetic force waves of the motor stator can be obviously inhibited, and the aim of effectively reducing the electromagnetic noise of the motor is fulfilled.
Description
Technical Field
The invention relates to a motor noise reduction method, in particular to an inscribed arc-based alternating-current traction motor stator tooth shoulder chamfering noise reduction method.
Background
The ac traction motor has been increasingly widely used in many fields because of its advantages such as simple and firm structure, reliable operation, high power, high rotation speed, etc. However, the motor generates larger noise during operation, which not only causes adverse effects on working environment and human health, but also limits the popularization and application of the motor in some special fields, so that the development of the motor noise reduction research is of great significance.
The main factor causing the excessive noise of the alternating current traction motor is the electromagnetic noise generated during the operation of the alternating current traction motor, so that extensive research is carried out at home and abroad at present on how to reduce the electromagnetic noise of the motor, and various methods for reducing the electromagnetic noise of the alternating current traction motor are provided, including the steps of changing the motor slot proportion, adopting the rotor chute design, changing the motor air gap length, improving the motor assembly process, optimizing the motor control method and the like, and although a certain effect is achieved, the distance from the actual noise reduction requirement is still larger.
The document "stator tooth chamfering-based method for weakening vibration noise of a near-pole slot permanent magnet synchronous motor" ("the authors of the electrical engineering and technical works": lie rock, li shuangpeng, zhou ji, li long maid ") introduces a method for reducing electromagnetic noise of a permanent magnet synchronous motor by adopting a stator tooth chamfering mode, and achieves a good effect. In this document, the chamfering method adopted for the stator teeth of the permanent magnet synchronous motor is a linear chamfering method, i.e., the shoulder angles of the stator teeth are cut off in a linear manner, and although the chamfering method achieves a good noise reduction effect, the desired noise reduction requirement cannot be achieved.
Disclosure of Invention
In order to solve the technical problems, the invention provides the method for reducing the noise of the angle of the shoulder of the stator tooth of the alternating-current traction motor based on the inscribed arc, which is simple to operate and has good noise reduction effect.
The technical scheme for solving the problems is as follows: an inscribed arc-based method for reducing noise of a stator tooth shoulder chamfer of an alternating-current traction motor comprises the following steps:
1) taking the vertex of the stator tooth shoulder angle as an end point, taking two points at equal distance along two side edges of the stator tooth shoulder angle according to a certain length from the end point, and taking the two points as tangent points D1 and D2 of an inscribed arc;
2) the two points of tangency D1 and D2 are used to form an inscribed arc of the tooth shoulder angle and the tooth shoulder angle is cut off along the inscribed arc.
In the above method for reducing noise of the stator tooth shoulder chamfer based on the inscribed arc, in step 2), the radius of the inscribed arc is determined by the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges and the included angle of the tooth shoulder angle, and the relationship is as follows:
in the formula: r is the radius of the inscribed arc, L is the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges, and alpha is the included angle of the tooth shoulder angle.
According to the method for reducing the noise of the chamfer of the stator tooth shoulder of the alternating-current traction motor based on the inscribed arc, the distances from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges are equal.
According to the method for reducing the noise of the chamfer of the stator tooth shoulder of the alternating-current traction motor based on the inscribed arc, the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges is smaller than the height of the notch of the stator of the motor.
The invention has the beneficial effects that: the invention aims at the tooth shoulders on the two sides of the stator tooth part of the alternating-current traction motor, the tooth shoulder angles close to the rotor side are cut off in an inscribed circular arc mode, and under the condition of basically not influencing other performances of the motor, the magnetic conductivity mutation from the tooth shoulders of the motor stator to the slot of the stator can be effectively slowed down, so that the amplitude of low-order electromagnetic force waves of the motor stator can be obviously inhibited, and the aim of effectively reducing the electromagnetic noise of the motor is fulfilled.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic structural diagram of a stator of an ac traction motor according to an embodiment of the present invention.
FIG. 3 is a schematic view of an AC traction motor stator tooth in an embodiment of the present invention.
Fig. 4 is a schematic view of an arc-shaped chamfer cut in a stator tooth shoulder of the ac traction motor in the embodiment of the present invention.
Fig. 5 is a schematic view of a linear chamfering of a stator tooth shoulder of an ac traction motor.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a stator of an ac traction motor according to an embodiment of the present invention. In the figure, the numbers respectively represent: 1-stator core, 2-stator core yoke part and 3-stator core tooth part.
FIG. 3 is a schematic view of the stator teeth of an AC traction motor in an embodiment of the present invention, as shown in FIG. 3; fig. 4 is a schematic view of an arc-shaped chamfer cut in a stator tooth shoulder of an ac traction motor according to an embodiment of the present invention. In conjunction with fig. 3 and 4, the numbers in the figures respectively indicate: 4-stator notch, 5-tooth crest, 6-tooth shoulder angle vertex, 7-tooth shoulder, 8-notch height H019 and 10 are respectively tangent points D1 and D2 of the inscribed arc and two sides of the stator tooth shoulder, radius R of the inscribed arc, 12 of the circle center O of the inscribed arc and 13 of the inscribed arc.
In the embodiment of the present invention, the structure of the motor rotor is kept unchanged, and the purpose of weakening the electromagnetic noise is achieved by chamfering the tooth shoulders 7 on both sides of the motor stator core tooth portion 3, as shown in fig. 1, the specific implementation manner is as follows:
1) taking the vertex 6 of the stator tooth shoulder angle as an end point, taking two points at equal distance along two side edges of the stator tooth shoulder angle according to a certain length from the end point, and taking the two points as tangent points D1 and D2 of the inscribed arc 13;
2) the two tangent points D1 and D2 form an inscribed arc 13 of the tooth shoulder angle and the tooth shoulder angle is cut off along the inscribed arc 13.
In the step 2), the radius R of the inscribed arc 13 is determined by the distance L from the vertex 6 of the stator tooth shoulder angle to the tangent points D1 and D2 on the two side edges and the included angle α of the tooth shoulder angle, and the relationship is as follows:
in the formula: r is the radius of the inscribed arc 13, and L is the tangent point from the vertex of the shoulder angle of the stator to the two side edgesThe distance from the vertex of the stator tooth shoulder angle to the tangent points at the two sides is equal, and the distance from the vertex of the stator tooth shoulder angle to the tangent points at the two sides is less than the height H of the motor stator notch01(ii) a Alpha is the included angle of the tooth shoulder angle.
For the stator core tooth part of the motor, the number of the tooth shoulder angles of the stator core tooth part is cut according to the method, and can be determined according to requirements.
Aiming at the noise reduction method provided by the invention, noise analysis is carried out by taking a certain type of alternating current traction motor as an example, and the main technical parameters are shown in table 1.
TABLE 1
The embodiment of the invention adopts ANSYS analysis software to firstly analyze the noise of the motor without chamfering, and the basic method is as follows: firstly, performing electromagnetic field analysis on a motor through a Maxwell module in ANSYS analysis software to obtain radial electromagnetic force data of the motor, then loading the data into a 3D motor model in a Harmonic Response module to perform Harmonic Response analysis, then coupling the obtained data into the 3D sound field model in the Harmonic acoustics module to perform sound field simulation, and then performing post-processing to obtain noise data of the motor. According to the method, the parameters shown in the table 1 are utilized to carry out noise analysis on the motor, and the obtained corresponding noise data are as follows: 67.904 dB. The noise value is the noise data of the motor without chamfering.
And then, chamfering is carried out on the motor by adopting an inscribed circular arc chamfering method, namely, the tooth shoulder angles of the two side tooth shoulders of the stator tooth part close to the rotor side are chamfered on the motor in an inscribed circular arc mode, then, noise analysis is carried out by utilizing ANSYS analysis software by adopting the same method, and meanwhile, the noise analysis is carried out by comparing with a linear chamfering method provided by a stator tooth chamfering-based near-pole slot permanent magnet synchronous motor vibration noise weakening method. Fig. 4 is a schematic view of an arc-shaped chamfer cut in a stator tooth shoulder of an ac traction motor according to an embodiment of the present invention, and fig. 5 is a schematic view of a linear chamfer cut in a stator tooth shoulder of an ac traction motorFigure (a). In fig. 5, the respective numbers indicate: 6-tooth shoulder apex, 7-tooth shoulder, 8-notch height H0114-cutting angle tangent line (straight line), 15, 16-cutting points D1 'and D2', respectively, that is, the intersection point of the cutting straight line and two sides of the stator tooth shoulder. The specific operation is as follows:
two groups of data are taken at equal intervals from the vertex 6 of the motor tooth shoulder angle to cutting points (phase cutting points) on two sides, if the data are respectively taken as 0.4mm and 0.6mm, the tooth shoulder angle is cut off by adopting an inscribed arc type angle cutting method and a linear type angle cutting method, then noise analysis is carried out by adopting ANSYS software respectively, and corresponding noise data are obtained and are shown in a table 2.
TABLE 2
| Serial number | Distance of cutting point (mm) | Straight line chamfering method (dB) | Inscribed arc type chamfering method (dB) |
| 1 | 0.4 | 52.793 | 47.391 |
| 2 | 0.6 | 48.626 | 44.636 |
The noise values obtained according to table 2 for the two chamfering methods are shown in table 3 in percentage decrease with respect to the noise data when the motor is not chamfered.
TABLE 3
| Serial number | Distance of cutting point (mm) | Straight line chamfering method (%) | Inscribed arc type chamfering method (%) |
| 1 | 0.4 | 22.25％ | 30.20％ |
| 2 | 0.6 | 28.39％ | 34.27％ |
As can be seen from tables 2 and 3, after the stator tooth shoulder of the ac traction motor is chamfered by the inscribed circular arc chamfering method, the noise is reduced significantly compared with the linear chamfering method, which indicates that the inscribed circular arc chamfering method has a better noise reduction effect and thus has a better application value.
Claims (4)
1. An inscribed arc-based method for chamfering and reducing noise of a stator tooth shoulder of an alternating-current traction motor is characterized by comprising the following steps:
1) taking the vertex of the stator tooth shoulder angle as an end point, taking two points at equal distance along two side edges of the stator tooth shoulder angle according to a certain length from the end point, and taking the two points as tangent points D1 and D2 of an inscribed arc;
2) the two points of tangency D1 and D2 are used to form an inscribed arc of the tooth shoulder angle and the tooth shoulder angle is cut off along the inscribed arc.
2. The inscribed-arc-based alternating current traction motor stator tooth shoulder chamfering noise reduction method according to claim 1, characterized in that: in the step 2), the radius of the inscribed arc is determined by the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges and the included angle of the tooth shoulder angle, and the relationship is as follows:
in the formula: r is the radius of the inscribed arc, L is the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges, and alpha is the included angle of the tooth shoulder angle.
3. The inscribed-arc-based alternating current traction motor stator tooth shoulder chamfering noise reduction method according to claim 1, characterized in that: and the distances from the vertex of the shoulder angle of the stator tooth to the tangent points of the two side edges are equal.
4. The inscribed-arc-based alternating current traction motor stator tooth shoulder chamfering noise reduction method according to claim 1, characterized in that: and the distance from the vertex of the stator tooth shoulder angle to the tangent points of the two side edges is less than the height of the motor stator notch.
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| CN201910988810.5A CN110601464A (en) | 2019-10-17 | 2019-10-17 | Method for reducing noise of chamfer angle of stator tooth shoulder of alternating-current traction motor based on inscribed arc |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803630A (en) * | 2021-03-22 | 2021-05-14 | 湖南科技大学 | Noise reduction optimization design method for alternating-current traction motor |
| US20210211016A1 (en) * | 2020-12-31 | 2021-07-08 | Hunan University Of Science And Technology | Denoising optimization method for ac traction motor by chamfering stator tooth shoulder |
| US20220255409A1 (en) * | 2021-02-05 | 2022-08-11 | Hunan University Of Science And Technology | Noise reduction method by cutting a corner of a tooth shoulder of a stator of an ac traction motor based on inscribed arc |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210211016A1 (en) * | 2020-12-31 | 2021-07-08 | Hunan University Of Science And Technology | Denoising optimization method for ac traction motor by chamfering stator tooth shoulder |
| US11799353B2 (en) * | 2020-12-31 | 2023-10-24 | Hunan University Of Science And Technology | Denoising optimization method for AC traction motor by chamfering stator tooth shoulder with inscribed arc |
| US20220255409A1 (en) * | 2021-02-05 | 2022-08-11 | Hunan University Of Science And Technology | Noise reduction method by cutting a corner of a tooth shoulder of a stator of an ac traction motor based on inscribed arc |
| CN112803630A (en) * | 2021-03-22 | 2021-05-14 | 湖南科技大学 | Noise reduction optimization design method for alternating-current traction motor |
| US11824411B2 (en) | 2021-03-22 | 2023-11-21 | Hunan University Of Science And Technology | Optimization design method for noise reduction of AC traction motor |
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