CN103078464A - Built-in permanent magnet synchronous motor - Google Patents
Built-in permanent magnet synchronous motor Download PDFInfo
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- CN103078464A CN103078464A CN2012105796757A CN201210579675A CN103078464A CN 103078464 A CN103078464 A CN 103078464A CN 2012105796757 A CN2012105796757 A CN 2012105796757A CN 201210579675 A CN201210579675 A CN 201210579675A CN 103078464 A CN103078464 A CN 103078464A
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Abstract
The invention discloses a built-in permanent magnet synchronous motor, relates to the technical field of a motor and aims to solve the technical problem of improving the comprehensive quality of the motor. Multiple permanent magnet slots are axially and symmetrically arranged in a rotor of the motor along the central axis of the rotor at intervals, three permanent magnets distributed in an arc band shape are arranged in each permanent magnet slot, wherein one permanent magnet is a middle steel magnet, and the other two permanent magnets are side steel magnets; the built-in permanent magnet synchronous motor is characterized in that each middle steel magnet adopts the normal magnetization vertical to the surface of the steel magnet, and each two side steel magnets in one slot adopt the non-normal magnetization, so that the arc center of a magnet arrangement arc of each permanent magnet slot is enabled not to coincide with the magnetization orientation point of permanent magnets in the corresponding permanent magnet slot. According to the motor provided by the invention, the comprehensive quality of the motor is greatly improved.
Description
Technical field
The present invention relates to motor technology, particularly relate to a kind of technology of internal permanent magnet synchronous motor.
Background technology
That electromechanical integration and automation occasion more and more require is efficient, energy-conservation, low noise, intellectuality, to being the requirement that its supporting motor proposes high efficiency, low noise, high output, fast-response, and at present many magnetoes exist defectives such as Electro Magnetic Compatibility is poor, noise large, it is little to exert oneself, torque fluctuations is large, overload capacity is low and power density is low.
All stud with rotor magnetic pole on the rotor of permagnetic synchronous motor, rotor magnetic pole is formed by banded laying of multistage magnet steel (being generally three sections) arc, the rotor magnetic pole of existing permagnetic synchronous motor has two kinds: 1) parallel-oriented magnetic pole, and in this magnetic pole, the direction of magnetization of each section magnet steel is parallel; 2) radial oriented magnetic pole, in this magnetic pole, the direction of magnetization of each section magnet steel is normal direction, namely perpendicular to the magnet steel surface.Existing permagnetic synchronous motor has many good qualities, as cancel mechanical commutator and brush, maintenance less, efficient is high, but its armature field is the rotating magnetic field of non-circular great-jump-forward, torque fluctuations is original just larger, add slot effect, have larger torque fluctuations, affect that motor is efficient, wide range speed control, steadily low noise operation, the integrated quality of therefore existing permagnetic synchronous motor is all relatively poor.
Summary of the invention
For the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides a kind of internal permanent magnet synchronous motor that can significantly improve the motor integrated quality.
In order to solve the problems of the technologies described above, a kind of internal permanent magnet synchronous motor provided by the present invention comprises stator and rotor, leaves air gap between the inner peripheral surface of described stator and the outer peripheral face of rotor;
Central axis axial symmetry around rotor on the described rotor is interval with a plurality of permanent magnetism grooves, be provided with three permanent magnets in each permanent magnetism groove, in three permanent magnets in each permanent magnetism groove, one of them permanent magnet is middle magnet steel, and two permanent magnets are the sidepiece magnet steel in addition;
In the radial section of rotor, have following relation between three permanent magnets in the single permanent magnetism groove: three permanent magnets in the permanent magnetism groove are laid successively along a circular arc line, and middle magnet steel is between two sidepiece magnet steel, the central point of three permanent magnets all drops on this circular arc line, this circular arc line is that the magnet of this permanent magnetism groove is laid camber line, it is a circular arc line towards rotor center axis arc protrusion that magnet is laid camber line, each permanent magnet is by the arc core of laying camber line through magnet, and the straight line of process this permanent magnet self central point is divided into two blocks that shape is consistent;
It is characterized in that, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove:
1) the orientation straight line of three permanent magnets in the permanent magnetism groove intersects at a point, and this point is the magnetization orientation point of permanent magnet in this permanent magnetism groove;
The orientation straight line of permanent magnet refers to, the direction of magnetization of permanent magnet under being parallel to, and the straight line of the central point of the affiliated permanent magnet of process;
2) magnet of the orientation straight line of magnet steel process permanent magnetism groove is laid the arc core of camber line in the middle of, and the axle center of process rotor;
3) magnet of permanent magnetism groove is laid the arc core of camber line, does not overlap mutually with the magnetization orientation point of permanent magnet in this permanent magnetism groove.
Further, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove: the spacing of establishing between the central point of the interior middle magnet steel of the magnetization orientation point of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line is R, H＞R is then arranged, and the H value is between 1.2 times of R values to 6 times R value.
Further, the H value is 3.6 times of R values.
Further, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove: the spacing of establishing between the central point of the interior middle magnet steel of the magnetization orientation point of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line is, H＜R is then arranged, and the H value is between 0.5 times of R value to 0.8 times R value.
Further, the H value is 0.65 times of R value.
Internal permanent magnet synchronous motor provided by the invention, by adjusting the direction of magnetization of two sidepiece magnet steel, optimize the magnet steel orientation, do not overlap mutually with the magnetization orientation point of the interior permanent magnet of permanent magnetism groove so that the magnet of permanent magnetism groove is laid the camber line arc core, can significantly improve the integrated quality of motor; When the spacing between the central point of the magnetization orientation point of permanent magnet in the permanent magnetism groove and middle magnet steel is laid the radius of curvature of camber line greater than magnet, " poly-magnetic effect " arranged, can significantly improve the air gap flux density between electric machine rotor, thereby Effective Raise is exerted oneself, overload capacity, power density and efficient; When the spacing between the central point of the magnetization orientation point of permanent magnet in the permanent magnetism groove and middle magnet steel is laid the radius of curvature of camber line less than magnet, can improve the motor gas-gap magnetic flux density waveforms, reduce harmonic component, particularly reduce 3 larger order harmonic components of amplitude, obtain sine wave magnetic field, reduce torque fluctuations, reduce noise and vibrations, even make motor adopt even air gap, also can significantly improve the motor gas-gap magnetic flux density waveforms, obtain sine wave magnetic field, neither reduce and exert oneself, can reduce the torque fluctuations that teeth groove causes again.The present invention increases substantially the motor integrated quality, realizes high power density, efficient, low fluctuation, low noise and high-precision and stable operation, realizes the motor miniaturization and.
Description of drawings
Fig. 1 is the radial section schematic diagram of the internal permanent magnet synchronous motor that provides of first embodiment of the invention;
Fig. 2, Fig. 3 are the radial section schematic diagrames of the rotor in the internal permanent magnet synchronous motor that provides of first embodiment of the invention;
Fig. 4 is the radial section schematic diagram of the rotor in the internal permanent magnet synchronous motor that provides of second embodiment of the invention;
Fig. 5 is the internal permanent magnet synchronous motor that provides of second embodiment of the invention and the air gap flux density waveform comparison diagram between the existing motor;
Fig. 6 is the internal permanent magnet synchronous motor that provides of second embodiment of the invention and the cogging torque waveform comparison diagram between the existing motor.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1, a kind of internal permanent magnet synchronous motor that first embodiment of the invention provides comprises stator 1 and rotor 2, leaves air gap between the outer peripheral face of the inner peripheral surface of described stator 1 and rotor 2;
Central axis axial symmetry around rotor 2 on the described rotor 2 is interval with a plurality of permanent magnetism grooves, be provided with three permanent magnets 31,32,33 in each permanent magnetism groove, in three permanent magnets in each permanent magnetism groove, one of them permanent magnet 32 is middle magnet steel, and other is the sidepiece magnet steel by two permanent magnets 31,33;
As shown in Figure 2, in the radial section of rotor, have following relation between three permanent magnets in the single permanent magnetism groove: three permanent magnets in the permanent magnetism groove are laid successively along a circular arc line M, and middle magnet steel 32 is positioned at two sidepiece magnet steel 31, between 33, the central point of three permanent magnets all drops on this circular arc line M, this circular arc line M is that the magnet of this permanent magnetism groove is laid camber line, it is a circular arc line towards rotor center axis arc protrusion that magnet is laid camber line M, each permanent magnet is by the arc core E that lays camber line M through magnet, and the straight line of process this permanent magnet self central point is divided into two blocks that shape is consistent;
As shown in Figure 3, in the radial section of rotor, also there is following relation between three permanent magnets in the single permanent magnetism groove:
1) orientation straight line C1, C2, the C3 of three permanent magnets in the permanent magnetism groove D that intersects at a point, this point is the magnetization orientation point of permanent magnet in this permanent magnetism groove;
The orientation straight line of permanent magnet refers to, the direction of magnetization of permanent magnet under being parallel to, and the straight line of the central point of the affiliated permanent magnet of process;
Among Fig. 3, straight line C1 is the orientation straight line of sidepiece magnet steel 31, and straight line C2 is the orientation straight line of middle magnet steel 32, and straight line C3 is the orientation straight line of sidepiece magnet steel 33;
2) magnet of the orientation straight line C2 of magnet steel 32 process permanent magnetism groove is laid the arc core E of camber line M in the middle of, and the axle center of process rotor;
3) magnet of permanent magnetism groove is laid the arc core E of camber line M, does not overlap mutually with the magnetization orientation point D of permanent magnet in this permanent magnetism groove;
The spacing of 4) establishing between the central point of the interior middle magnet steel 32 of the magnetization orientation point D of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line M is R, H＞R is then arranged, and the H value is between 1.2 times of R values to 6 times R value, and the H value is preferably 3.6 times of R values in the present embodiment.
First embodiment of the invention compared to existing technology in, adopt the permagnetic synchronous motor of the magnet steel composition arc rotor magnetic pole of parallel magnetized magnet steel or diametrical magnetization, have good " poly-magnetic effect ", can significantly improve the air gap flux density 8%-10% between electric machine rotor, because the power output of motor and output torque, be directly proportional with air gap flux density between rotor, therefore can exert oneself by Effective Raise, overload capacity, power density and efficient, and the mechanical time constant of motor and air gap flux density square are inversely proportional to, acceleration is directly proportional with air gap flux density, therefore can significantly reduce mechanical time constant, improve fast response characteristic.
As shown in Figure 4, a kind of internal permanent magnet synchronous motor that second embodiment of the invention provides comprises stator and rotor, leaves air gap between the inner peripheral surface of described stator and the outer peripheral face of rotor;
Central axis axial symmetry around rotor on the described rotor is interval with a plurality of permanent magnetism grooves, be provided with three permanent magnets 231,232,233 in each permanent magnetism groove, in three permanent magnets in each permanent magnetism groove, one of them permanent magnet 232 is middle magnet steel, and other is the sidepiece magnet steel by two permanent magnets 231,233;
In the radial section of rotor, have following relation between three permanent magnets in the single permanent magnetism groove: three permanent magnets in the permanent magnetism groove are laid successively along a circular arc line M2, and middle magnet steel 232 is positioned at two sidepiece magnet steel 231, between 233, the central point of three permanent magnets all drops on this circular arc line M2, this circular arc line M2 is that the magnet of this permanent magnetism groove is laid camber line, it is a circular arc line towards rotor center axis arc protrusion that magnet is laid camber line M2, each permanent magnet is by the arc core E2 that lays camber line M2 through magnet, and the straight line of process this permanent magnet self central point is divided into two blocks that shape is consistent;
In the radial section of rotor, also there is following relation between three permanent magnets in the single permanent magnetism groove:
1) orientation straight line C21, C22, the C23 of three permanent magnets in the permanent magnetism groove D2 that intersects at a point, this point is the magnetization orientation point of permanent magnet in this permanent magnetism groove;
The orientation straight line of permanent magnet refers to, the direction of magnetization of permanent magnet under being parallel to, and the straight line of the central point of the affiliated permanent magnet of process;
Among Fig. 4, straight line C21 is the orientation straight line of sidepiece magnet steel 231, and straight line C22 is the orientation straight line of middle magnet steel 232, and straight line C23 is the orientation straight line of sidepiece magnet steel 233;
2) magnet of the orientation straight line C22 of magnet steel 232 process permanent magnetism groove is laid the arc core E2 of camber line M2 in the middle of, and the axle center of process rotor;
3) magnet of permanent magnetism groove is laid the arc core E2 of camber line M2, does not overlap mutually with the magnetization orientation point D2 of permanent magnet in this permanent magnetism groove;
The spacing of 4) establishing between the central point of the interior middle magnet steel 232 of the magnetization orientation point D2 of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line M2 is R, H＜R is then arranged, and the H value is between 0.5 times of R value to 0.8 times R value, and the H value is preferably 0.65 times of R value in the present embodiment.
Second embodiment of the invention compared to existing technology in, adopt the permagnetic synchronous motor of the magnet steel composition arc rotor magnetic pole of parallel magnetized magnet steel or diametrical magnetization, can improve the motor gas-gap magnetic flux density waveforms, reduce harmonic component, particularly reduce 3 larger order harmonic components of amplitude, obtain good sine wave magnetic field, reduce the torque fluctuations that teeth groove causes, reduce noise and vibrations, even make motor adopt even air gap, also can significantly improve the motor gas-gap magnetic flux density waveforms, obtain sine wave magnetic field, neither reduce and exert oneself, again can the decrease torque fluctuations, the motor integrated quality is increased substantially, realize high power density, efficiently, low fluctuation, low noise and high-precision and stable operation realize the motor miniaturization and.
As shown in Figure 5, vertical pivot Bg among Fig. 5 is the air gap flux density number line, curve S 2 is air gap flux density waveforms that the magnet steel of existing employing diametrical magnetization forms the permagnetic synchronous motor of arc rotor magnetic pole, can find out that curve S 2 is near trapezoidal wave, curve S 1 is the air gap flux density waveform of the internal permanent magnet synchronous motor of second embodiment of the invention, it is sinusoidal wave to find out that curve S 1 approaches, can effectively reduce the torque fluctuations that teeth groove causes, the motor integrated quality is increased substantially, realize high power density, efficient, low fluctuation, low noise and high-precision and stable operation.
As shown in Figure 6, vertical pivot Tcog among Fig. 6 is the cogging torque number line, transverse axis O is the electrical degree number line, curve K1 is the cogging torque waveform that the magnet steel of existing employing diametrical magnetization forms the permagnetic synchronous motor of arc rotor magnetic pole, its cogging torque Tcog peak value relative value is near 1, curve K2 is the cogging torque waveform of the internal permanent magnet synchronous motor of second embodiment of the invention, its cogging torque Tcog peak value relative value is 0.13, but the torque fluctuations that the decrease teeth groove causes, reduce noise and vibrations, the motor integrated quality is increased substantially, satisfy electromechanical integration and automation occasion to the performance requirement of drive motors, the realization industrialization is produced, and realizes high power density, wide range speed control, fast-response, frequent starting and even running.
Claims (5)
1. an internal permanent magnet synchronous motor comprises stator and rotor, leaves air gap between the inner peripheral surface of described stator and the outer peripheral face of rotor;
Central axis axial symmetry around rotor on the described rotor is interval with a plurality of permanent magnetism grooves, be provided with three permanent magnets in each permanent magnetism groove, in three permanent magnets in each permanent magnetism groove, one of them permanent magnet is middle magnet steel, and two permanent magnets are the sidepiece magnet steel in addition;
In the radial section of rotor, have following relation between three permanent magnets in the single permanent magnetism groove: three permanent magnets in the permanent magnetism groove are laid successively along a circular arc line, and middle magnet steel is between two sidepiece magnet steel, the central point of three permanent magnets all drops on this circular arc line, this circular arc line is that the magnet of this permanent magnetism groove is laid camber line, it is a circular arc line towards rotor center axis arc protrusion that magnet is laid camber line, each permanent magnet is by the arc core of laying camber line through magnet, and the straight line of process this permanent magnet self central point is divided into two blocks that shape is consistent;
It is characterized in that, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove:
1) the orientation straight line of three permanent magnets in the permanent magnetism groove intersects at a point, and this point is the magnetization orientation point of permanent magnet in this permanent magnetism groove;
The orientation straight line of permanent magnet refers to, the direction of magnetization of permanent magnet under being parallel to, and the straight line of the central point of the affiliated permanent magnet of process;
2) magnet of the orientation straight line of magnet steel process permanent magnetism groove is laid the arc core of camber line in the middle of, and the axle center of process rotor;
3) magnet of permanent magnetism groove is laid the arc core of camber line, does not overlap mutually with the magnetization orientation point of permanent magnet in this permanent magnetism groove.
2. internal permanent magnet synchronous motor according to claim 1, it is characterized in that, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove: the spacing of establishing between the central point of the interior middle magnet steel of the magnetization orientation point of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line is R, H＞R is then arranged, and the H value is between 1.2 times of R values to 6 times R value.
3. internal permanent magnet synchronous motor according to claim 2, it is characterized in that: the H value is 3.6 times of R values.
4. internal permanent magnet synchronous motor according to claim 1, it is characterized in that, in the radial section of rotor, also have following relation between three permanent magnets in the single permanent magnetism groove: the spacing of establishing between the central point of the interior middle magnet steel of the magnetization orientation point of permanent magnet in the permanent magnetism groove and this permanent magnetism groove is H, the radius of curvature that the magnet of this permanent magnetism groove is laid camber line is, H＜R is then arranged, and the H value is between 0.5 times of R value to 0.8 times R value.
5. internal permanent magnet synchronous motor according to claim 4, it is characterized in that: the H value is 0.65 times of R value.
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| CN201210579675.7A CN103078464B (en) | 2012-12-27 | 2012-12-27 | Built-in permanent magnet synchronous motor |
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| CN201210579675.7A CN103078464B (en) | 2012-12-27 | 2012-12-27 | Built-in permanent magnet synchronous motor |
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| CN103078464B CN103078464B (en) | 2015-04-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017070039A (en) * | 2015-09-29 | 2017-04-06 | ダイキン工業株式会社 | Rotor |
| WO2018040352A1 (en) * | 2016-09-05 | 2018-03-08 | 安徽美芝制冷设备有限公司 | Variable-frequency rotor used in reciprocating compressor, and compressor having same |
| CN108173402A (en) * | 2018-01-21 | 2018-06-15 | 湖北西浦电机科技有限责任公司 | The salient pole synchronous electric machine of double eccentric arc field structures |
| CN109149823A (en) * | 2018-11-07 | 2019-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and motor |
| JP2020202718A (en) * | 2019-06-13 | 2020-12-17 | 株式会社ダイドー電子 | Permanent magnet rotor and rotating electric machine |
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| CN102761217A (en) * | 2012-08-02 | 2012-10-31 | 山东呈瑞新能源科技有限公司 | Integral type steel magnet of high-performance permanent magnetic synchronous motor |
| US20120293033A1 (en) * | 2011-05-19 | 2012-11-22 | Denso Corporation | Rotor for electric rotating machine |
| CN202978655U (en) * | 2012-12-27 | 2013-06-05 | 上海特波电机有限公司 | Built-in permanent-magnet synchronous motor |
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| CN1098568A (en) * | 1993-05-26 | 1995-02-08 | 株式会社东芝 | Permanent magnet motor |
| CN201312221Y (en) * | 2008-07-31 | 2009-09-16 | 上海电科电机科技有限公司 | Internal permanent magnet synchronous motor rotor structure |
| US20120293033A1 (en) * | 2011-05-19 | 2012-11-22 | Denso Corporation | Rotor for electric rotating machine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017070039A (en) * | 2015-09-29 | 2017-04-06 | ダイキン工業株式会社 | Rotor |
| WO2018040352A1 (en) * | 2016-09-05 | 2018-03-08 | 安徽美芝制冷设备有限公司 | Variable-frequency rotor used in reciprocating compressor, and compressor having same |
| CN108173402A (en) * | 2018-01-21 | 2018-06-15 | 湖北西浦电机科技有限责任公司 | The salient pole synchronous electric machine of double eccentric arc field structures |
| CN109149823A (en) * | 2018-11-07 | 2019-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and motor |
| CN109149823B (en) * | 2018-11-07 | 2023-11-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and motor |
| JP2020202718A (en) * | 2019-06-13 | 2020-12-17 | 株式会社ダイドー電子 | Permanent magnet rotor and rotating electric machine |
| JP7177442B2 (en) | 2019-06-13 | 2022-11-24 | 株式会社ダイドー電子 | Permanent magnet rotors and rotating electrical machines |
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| CN103078464B (en) | 2015-04-22 |
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