CN113098172B - Uneven air gap structure for weakening inherent shaft voltage of built-in permanent magnet motor - Google Patents
Uneven air gap structure for weakening inherent shaft voltage of built-in permanent magnet motor Download PDFInfo
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- CN113098172B CN113098172B CN202110506130.2A CN202110506130A CN113098172B CN 113098172 B CN113098172 B CN 113098172B CN 202110506130 A CN202110506130 A CN 202110506130A CN 113098172 B CN113098172 B CN 113098172B
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- air gap
- permanent magnet
- circular arc
- arc structure
- shaft voltage
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The present disclosure provides an uneven air gap structure for weakening an inherent shaft voltage of a interior permanent magnet motor, which is applied to the interior permanent magnet synchronous motor, and includes: a rotor body including a plurality of magnetic poles; the outer surface of the rotor corresponding to each magnetic pole sequentially comprises three sections of circular arc structures, the first circular arc structure and the third circular arc structure correspond to a first circle center, the second circular arc structure is positioned between the first circular arc structure and the third circular arc structure, the second circular arc structure corresponds to a second circle center, and the second circular arc structure is embedded with a preset distance relative to the first circular arc structure and the third circular arc structure; the method can effectively weaken the inherent shaft voltage of the built-in permanent magnet synchronous motor, and improve the reliability and stability of the motor.
Description
Technical Field
The disclosure relates to the technical field of interior permanent magnet synchronous motors, in particular to a non-uniform air gap structure of a rotor for weakening the inherent shaft voltage of an interior permanent magnet motor.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Because of the advantages of high power density, high efficiency, strong weak magnetic speed-expanding capability and the like, the built-in permanent magnet synchronous motor is widely applied to the application occasions of electric vehicles, medical instruments, rail transit and the like. Therefore, the interior permanent magnet synchronous motor must have high reliability.
The inherent shaft voltage is generated by magnetic circuit imbalance caused by the pole slot matching of the built-in permanent magnet synchronous motor. When the amplitude of the inherent shaft voltage is higher than the breakdown threshold of the oil film of the bearing, loop shaft current can be generated, and the bearing is damaged in a short time.
The inventors found that, with respect to the shaft voltage weakening measure of the interior permanent magnet synchronous motor, there is less research on suppressing the inherent shaft voltage from the viewpoint of the electromagnetic design of the motor.
Disclosure of Invention
In order to solve the defects of the prior art, the non-uniform air gap structure for weakening the inherent shaft voltage of the interior permanent magnet motor is provided, is applied to the interior permanent magnet synchronous motor, can effectively weaken the inherent shaft voltage of the interior permanent magnet synchronous motor, and improves the reliability of the operation of a motor system.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the present disclosure provides an uneven air gap structure for weakening an intrinsic shaft voltage of an interior permanent magnet motor, applied to an interior permanent magnet synchronous motor, including: a rotor body including a plurality of magnetic poles;
the outer surface of the rotor corresponding to each magnetic pole sequentially comprises three sections of circular arc structures, the first circular arc structure and the third circular arc structure correspond to a first circle center, the second circular arc structure is located between the first circular arc structure and the third circular arc structure, the second circular arc structure corresponds to a second circle center, and the second circular arc structure is embedded with a preset distance relative to the first circular arc structure and the third circular arc structure.
Furthermore, the pole arc coefficient and the width of the magnetic isolation bridge of the rotor uneven air gap structure are consistent with those of the rotor even air gap structure.
Furthermore, the minimum air gap is the air gap corresponding to the center line of the magnetic pole, and the maximum air gap is the air gap corresponding to the two rays of the center angle corresponding to the permanent magnet slot.
Furthermore, the distance of the second arc structure embedded relative to the first arc structure and the third arc structure is equal.
Furthermore, the first circle center is the circle center of the uniform air gap structure of the rotor.
Furthermore, the inherent shaft voltage of the built-in permanent magnet synchronous motor is in direct proportion to the air gap magnetic conductance Fourier decomposition coefficient and the magnetomotive force Fourier decomposition coefficient.
A second aspect of the present disclosure provides an interior permanent magnet synchronous machine comprising the non-uniform air gap structure of the first aspect of the present disclosure that attenuates the intrinsic shaft voltage of the interior permanent magnet synchronous machine.
Compared with the prior art, this disclosed beneficial effect is:
1. the non-uniform air gap structure of the rotor adopted by the method can effectively weaken the inherent shaft voltage of the built-in permanent magnet synchronous motor, and improves the reliability and stability of the motor operation.
2. The non-uniform air gap structure of the rotor is adopted, the width of the magnetic isolation bridge is unchanged, the mechanical strength of the magnetic isolation bridge is guaranteed, the magnetic leakage condition of the magnetic isolation bridge is close to that of the uniform air gap structure of the rotor, and the non-uniform air gap structure of the rotor is convenient in processing technology and easy to achieve.
Advantages of additional aspects of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to be construed as limiting the disclosure.
Fig. 1 is a schematic diagram of a non-uniform air gap structure of a rotor of a V-shaped rotor magnetic circuit structure provided in embodiment 1 of the present disclosure.
Fig. 2 is an air gap flux density curve of the 4-pole 6-slot interior permanent magnet synchronous motor provided in embodiment 1 of the present disclosure under different eccentricity.
Fig. 3 is a graph of the intrinsic shaft voltage of the 4-pole 6-slot interior permanent magnet synchronous motor provided in embodiment 1 of the present disclosure at different eccentricities.
Detailed Description
The present disclosure is further illustrated by the following examples in conjunction with the accompanying drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
the embodiment 1 of the present disclosure provides an uneven air gap structure of a rotor for weakening the inherent shaft voltage of an interior permanent magnet synchronous motor, which is illustrated in fig. 1 by taking an interior permanent magnet synchronous motor with a V-shaped rotor magnetic circuit structure as an example.
In the figure, R 1 Is the radius of the rotating shaft, R 2 Is the stator bore diameter, delta 1 To a minimum air gap length, δ 2 For maximum air gap length, arc 1 、arc 2 、arc 3 Is a circular arc,/ 1 、l 2 Being a line segment, a circular arc 1 、arc 3 The corresponding circle center is O, namely the circle center of the rotor with the uniform air gap structure, and the arc 2 The corresponding circle center is O', d is the eccentricity, and alpha is the corresponding circle center angle of the permanent magnet slot.
The specific working principle is as follows:
the magnitude of the inherent shaft voltage of the built-in permanent magnet synchronous motor is in direct proportion to the air gap magnetic conductance Fourier decomposition coefficient and the magnetomotive force Fourier decomposition coefficient. When the air gap structure is uniform, the distribution of the magnetomotive force of the built-in permanent magnet synchronous motor along the circumference of the air gap is generally flat-top waveform and contains rich harmonic waves. When the rotor adopts an uneven air gap structure, the air gap magnetomotive force waveform is close to a sine wave, the magnetomotive force harmonic content related to the inherent shaft voltage is reduced, and the inherent shaft voltage of the motor is weakened.
The magnitude of the inherent shaft voltage of the built-in permanent magnet synchronous motor is in direct proportion to the air gap magnetic conductance Fourier decomposition coefficient and the magnetomotive force Fourier decomposition coefficient. Compared with the uniform air gap structure of the rotor, the pole arc coefficient and the width of the magnetic isolation bridge of the nonuniform air gap structure of the rotor are kept unchanged
In this example,/ 1 And l 2 Are equal.
Preferably, the finite element analysis software selects Ansoft Maxwell.
For example, a 4-pole 6-slot interior permanent magnet synchronous motor has a synchronous rotating speed frequency of 400 Hz.
In Maxwell 2D finite element software, no-load inherent shaft voltage simulation models with eccentric distances D of 0mm, 0.5mm, 1mm, 1.5mm and 2mm are respectively established.
The air gap flux density curve of the 4-pole 6-slot interior permanent magnet synchronous motor under different eccentricity is shown in figure 2. As can be seen from the figure, the air gap flux density waveform becomes close to a sine wave as the eccentricity increases.
The inherent shaft voltage curves of the 4-pole 6-slot interior permanent magnet synchronous motor under different eccentricities are shown in fig. 3. It can be seen from the figure that the magnitude of the natural shaft voltage curve gradually decreases with increasing eccentricity.
The air gap flux density of the rotor non-uniform air gap structure, the fundamental wave of the inherent shaft voltage and the amplitude of each harmonic are shown in table 1. As can be seen from the table, the fundamental amplitude of the natural shaft voltage gradually decreases as the eccentricity increases. Thus, the intrinsic axis voltage curve decreases in magnitude.
Table 1: the air gap flux density of the rotor uneven air gap structure, the fundamental wave of the inherent shaft voltage and the amplitude of each subharmonic.
Example 2:
the embodiment 2 of the present disclosure provides an interior permanent magnet synchronous motor, which includes the uneven air gap structure for weakening the inherent shaft voltage of the interior permanent magnet synchronous motor described in the embodiment 1 of the present disclosure.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (5)
1. An uneven air gap structure for weakening the inherent shaft voltage of an interior permanent magnet motor is characterized in that: be applied to interior permanent magnet synchronous machine, include: a rotor body including a plurality of magnetic poles;
the rotor circumferential outer surface corresponding to each magnetic pole sequentially comprises three sections of circular arc structures, the first circular arc structure and the third circular arc structure correspond to a first circle center, the second circular arc structure is positioned between the first circular arc structure and the third circular arc structure and corresponds to a second circle center, and the second circular arc structure is embedded with a preset distance relative to the first circular arc structure and the third circular arc structure;
the pole arc coefficient of the magnetic pole of the rotor uneven air gap structure is consistent with that of the rotor even air gap structure; the width of a magnetic isolation bridge between the outer end of the permanent magnet groove and the first arc is consistent with that between the outer end of the permanent magnet groove and the third arc;
the minimum air gap is an air gap corresponding to the central line of the magnetic pole on the second circular arc structure, the maximum air gap is an air gap corresponding to two rays of a central angle corresponding to the vertex of the permanent magnet slot, and the vertex corresponds to the endpoint of the second circular arc structure.
2. The uneven air gap structure for weakening the intrinsic shaft voltage of an interior permanent magnet motor according to claim 1, wherein:
the distance of the second arc structure embedded relative to the first arc structure and the third arc structure is equal.
3. The uneven air gap structure for weakening the intrinsic shaft voltage of an interior permanent magnet motor according to claim 1, wherein:
the first circle center is the circle center of the uniform air gap structure of the rotor.
4. The non-uniform air gap structure for attenuating intrinsic shaft voltage of an interior permanent magnet machine according to claim 1, wherein:
the intrinsic axis voltage of the built-in permanent magnet synchronous motor is in direct proportion to the air gap magnetic conductance Fourier decomposition coefficient and the magnetomotive force Fourier decomposition coefficient.
5. An interior permanent magnet synchronous motor, characterized in that: an uneven air gap structure for weakening the inherent shaft voltage of an interior permanent magnet motor as claimed in any one of claims 1 to 4.
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| CN202110506130.2A CN113098172B (en) | 2021-05-10 | 2021-05-10 | Uneven air gap structure for weakening inherent shaft voltage of built-in permanent magnet motor |
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| CN202110506130.2A CN113098172B (en) | 2021-05-10 | 2021-05-10 | Uneven air gap structure for weakening inherent shaft voltage of built-in permanent magnet motor |
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| CN113098172B true CN113098172B (en) | 2022-07-26 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002112513A (en) * | 2000-09-29 | 2002-04-12 | Toshiba Corp | Dynamo-electric machine |
| JP2003274590A (en) * | 2002-03-15 | 2003-09-26 | Nippon Steel Corp | Rotor of permanent-magnet synchronous motor |
| CN101944787B (en) * | 2009-07-10 | 2012-09-05 | 上海电驱动有限公司 | Outer surface structure of magnetic steel embedded rotor |
| CN204741351U (en) * | 2015-07-06 | 2015-11-04 | 温岭市中大摩托车部件有限公司 | Rotor blade of silicon steel for PMSM |
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