WO2004015841A1 - 永久磁石式回転電機の回転子 - Google Patents
永久磁石式回転電機の回転子 Download PDFInfo
- Publication number
- WO2004015841A1 WO2004015841A1 PCT/JP2003/010147 JP0310147W WO2004015841A1 WO 2004015841 A1 WO2004015841 A1 WO 2004015841A1 JP 0310147 W JP0310147 W JP 0310147W WO 2004015841 A1 WO2004015841 A1 WO 2004015841A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnet
- magnets
- electric machine
- rotating electric
- magnetic pole
- Prior art date
Links
Classifications
-
- 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]
Definitions
- the present invention relates to a rotor of a rotating electric machine having a permanent magnet, and more particularly to an embedded magnet type rotor in which a magnet is embedded in an iron core of the rotor.
- JP-A-2002-44887 there is JP-A-2002-44887, and there is an example in which an Nd_Fe-1B sintered magnet is embedded in a rotor core to form a rotor.
- the magnet has a flat plate shape with a single character in a plan view, is inscribed substantially in the outer periphery of the rotor, and is arranged in a substantially polygonal shape. Further, the magnets are arranged over the entire circumference in the rotor circumferential direction, and the magnetic poles are constituted by a plurality of equally divided magnets.
- the magnets are arranged uniformly over the entire circumference so as to be inscribed in the outer peripheral circle of the rotor core, the magnetic flux distribution is largely dispersed, and a good magnetic flux distribution can be obtained.
- the distortion rate of the induced electromotive force waveform was large, and the effective value of the fundamental wave of the induced electromotive force was reduced, so that the rotating electrical machine efficiency was reduced.
- the cogging torque increased and the starting current during motor operation increased, making it difficult to start smoothly.
- magnets are arranged around the entire circumference of the rotor, the use of magnets increases, resulting in higher costs.
- an object of the present invention is to provide a permanent magnet type rotating electric machine that solves the above-mentioned problems and has high efficiency, high performance, and low cost.
- the present invention relates to a rotor having a permanent magnet arranged on the inner periphery of a stator having a plurality of armature windings, wherein at least three or more rotors are provided per magnetic pole.
- the total angle occupied by the magnets, which are composed of magnets and form one pole of the magnetic poles, in the electrical angle is set so as to be in the range of 150 to 165 degrees.
- the magnetic flux is concentrated at the center of the magnetic pole, so that a good magnetic flux distribution can be obtained.
- the effective value of the fundamental wave of the induced electromotive force can be increased, thereby improving the efficiency of the rotating electric machine.
- the magnet group is concentrated at the center of the magnetic pole, the amount of magnet used is reduced, and an inexpensive permanent magnet rotating electric machine can be provided.
- the distortion rate and cogging torque of the induced electromotive force waveform are reduced, and the current required at the start of rotation is reduced.
- the value can be reduced and, at the same time, a smooth rotation start can be obtained.
- the angle of inclination is in the range of 2 to 6 degrees, the induced electromotive force can be effectively increased, so that high performance of the rotating electric machine can be realized.
- the slot shape in which the magnets are housed is a shape in which a slit is formed between the magnets, the leakage magnetic flux generated between the magnets is reduced, and the utilization efficiency of the magnets can be increased.
- a magnet fixing material is sealed in the slit portion, the reliability of the rotor can be improved.
- the magnet cost can be reduced.
- FIG. 1 is a cross-sectional view showing the structure of one embodiment of a rotor of a permanent magnet type rotating electric machine according to the present invention
- FIG. 2 is an explanation of various characteristics of the rotating electric machine when the circumferential angle 01 of the magnet is changed.
- Fig. 3 shows the permanent magnet type rotating electric machine according to the present invention.
- FIG. 4 is a cross-sectional view showing the structure of another embodiment of the rotor
- FIG. 4 is a diagram illustrating various characteristics of the rotating electric machine when the angle 02 at which the magnet is inclined toward the center of the magnetic pole is changed
- FIG. FIG. 6 is an explanatory view of a rotor structure showing another embodiment of the present invention.
- FIG. 6 is an explanatory view of a rotor structure showing another embodiment of the present invention.
- FIG. 7 is a center position of a magnet showing an embodiment of the present invention.
- FIG. 8 is a detailed view showing the arrangement of the center position of the magnet showing another embodiment of the present invention, and
- FIG. 9 is a view showing the resistance when the outer peripheral wall thickness D 1 of the rotor core is changed.
- FIG. 10 is a diagram showing the results of a study of the centrifugal force and various characteristics of the rotating electric machine.
- FIG. 10 is an explanatory diagram of a rotor structure according to the prior art. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a rotor structure of a permanent magnet type rotating electric machine which is an embodiment of the rotating electric machine according to the present invention.
- Rotor 1 has rotor core 2, slot 3 in which magnets are housed, N-pole permanent magnet 10, S-pole permanent magnet 11, rotating shaft 20, and outer circumference of magnets 10 and 11.
- a plurality of braking windings 4 are provided.
- the rotor core 2 is a cylindrical laminated core formed by laminating a plurality of thin iron plates punched into a predetermined shape.
- the N-pole permanent magnet 10 and the S-pole permanent magnet 11 are magnets that generate magnetic flux ⁇ f, and are divided into three per magnetic pole. These magnets are arranged in slots 3 installed near the outer peripheral surface of the rotor core 2 so as to form two magnetic poles, and each slot 3 is arranged so as to concentrate in the direction of the magnetic pole center position. Is placed.
- the total angle occupied by the magnet group constituting one magnetic pole in the electrical angle is the circumferential angle of the magnet 0 1
- various characteristics of the rotating electric machine can be obtained. Can be greatly improved Was. The details are described below.
- Figure 2 shows the relationship between the magnet's circumferential angle 01 and the characteristics of the no-load induced electromotive force, the distortion factor of the no-load induced electromotive force waveform, and the cogging torque when the generator is operated.
- the magnet groups constituting one magnetic pole are arranged uniformly, and the circumferential angle 01 of the magnet per magnetic pole is almost equal to 180 degrees. . Therefore, in Fig. 2, the circumferential angle 01 of the magnet according to the conventional technology is set to 175 °, and the circumferential angle 01 of the magnet is examined in the range of 135 ° to 175 °.
- Each result when the circumferential angle 0 1 of the magnet was changed is expressed based on the case where the magnet circumferential angle 0 1 is 175 degrees.
- the no-load induced electromotive force which is closely related to the efficiency of the permanent magnet type rotating electric machine, is larger than that of the conventional technology, and the distortion rate of the no-load induced electromotive force waveform, which is important for the generator function, and the The circumferential angle 0 1 of the magnet at which both the cogging torque affecting vibration and noise is smaller than that of the prior art is in a range from 150 degrees to less than 17.5 degrees.
- the distortion rate and cogging torque of the no-load induced electromotive force waveform increase sharply when the circumferential angle ⁇ 1 of the magnet exceeds 165 degrees.
- the range of 150 degrees to 16.5 degrees was adopted as the optimal range of the circumferential angle ⁇ 1 of the magnet.
- FIG. 3 shows a structure of a rotor 1 of a permanent magnet type rotating electric machine which is another embodiment of the rotating electric machine according to the present invention.
- the rotor 1 has a rotor core 2, a slot 3 in which magnets are housed, N-pole permanent magnets 10 (10a, 10b, 10c), and S-pole permanent magnets 1 1 (1 1 a, lib, 1 1 c), rotation axis 20 and magnet
- a plurality of braking windings 4 are provided on the outer peripheral side of the stones 10 and 11.
- the rotor core 2 is a cylindrical laminated core formed by laminating a plurality of thin iron plates punched into a predetermined shape.
- the N-pole permanent magnet 10 and the S-pole permanent magnet 11 are magnets that generate magnetic flux ⁇ f, and are divided into three parts per magnetic pole.
- the magnets 10a, 10c, 11a, and 11c located at the magnetic pole ends are arranged to be inclined toward the magnetic pole center position.
- the angle of the magnet toward the magnetic pole center position that is, the point P s on the outer peripheral surface of the rotor core 2 on a straight line passing through the two points of the rotation axis center and the magnet center is used as the contact point.
- the sign of the angle at which the magnet is inclined is assumed to be positive in the direction in which the magnet is inclined toward the center of the magnetic pole.
- the no-load induced electromotive force increased in the angle range of 0.0 degrees, 0.2 degrees, and 10.0 degrees.
- the distortion rate and cogging torque of the no-load induced electromotive force waveform became smaller in the entire study range from 12.5 degrees to 10.0 degrees except for 0.0 degrees.
- the no-load induced electromotive force is large, and the distortion rate and cogging torque of the no-load induced electromotive force waveform are small with respect to the reference characteristics in which the magnet inclination angle 02 is 0.0 degrees.
- the tilt angle 02 of the magnet that satisfies the condition at the same time is in the range of 0 ⁇ 0.1 degrees, which is 0.0 degrees.
- the no-load induced electromotive force which is closely related to the efficiency of the permanent magnet type rotating electric machine, is almost maximum when the magnet inclination angle 0 2 is set in the range of 2 degrees to 6 degrees. Therefore, in view of the above, in the present invention, the range of 2.0 degrees to 6.0 degrees was adopted as the optimum range of the inclination angle 02 of the magnet.
- FIG. 6 is an explanatory view of a rotor structure showing another embodiment of the present invention.
- magnets 10 and 11 are stored in slot 3, slits are provided between magnets 10 and 11 respectively.
- This is an example in which a slot 3 in which 15 is formed is formed.
- the slit 15 has the effect of reducing the leakage magnetic flux generated between the magnets 10 and 11 even when air (hollow) is used, and increasing the magnet utilization efficiency.
- a magnet fixing material such as a magnet or an adhesive is enclosed, the magnet fixing material penetrates to the gap between the magnets 10 and 11 and the rotor core 2 to fix the magnets 10 and 11 to the rotor core 2.
- Fig. 7 shows the details of the arrangement of the center positions of the magnets described so far.
- the center positions of the plurality of magnets constituting the magnetic poles are on the same circular arc, and the magnets at the end portions of the magnetic poles are inclined so as to face the center position of the magnet with respect to the center position of the magnets.
- the wall thickness D 1 decreases as the magnet inclination 0 2 increases. At a rotation speed of several thousand rotations, the centrifugal force acting on the magnet is small, and even if the rotor core outer peripheral wall thickness is about D1 force S 0.5 mm, the magnet is sufficiently fixed and there is no problem in mechanical strength.
- the thickness D1 of the outer periphery of the rotor core must be properly adjusted.
- the improvement of the mechanical strength of the outer peripheral portion of the rotor adjacent to the magnet can be achieved by disposing the magnet more in the inner peripheral direction of the rotor.
- simply arranging in the inner circumferential direction of the rotor increases the amount of magnetic flux leaking to the iron core adjacent to the magnet, deteriorating the rotating electrical characteristics.
- the rotor core outer peripheral wall thickness D 1 has an appropriate value in consideration of both mechanical strength improvement and prevention of deterioration of the rotating electrical machine characteristics.
- FIG. 8 is an explanatory view of a rotor structure showing another embodiment of the present invention.
- magnet While maintaining the setting range of circumferential angle 6> 1 and magnet tilt angle 02, the magnet arranged at the pole tip was moved to the inner circumference of the rotor so as to withstand tens of thousands of centrifugal forces. . That is, in the arrangement of the plurality of magnets in the rotor core, the arc passing through the center of the magnet arranged on the pole end side is smaller than the arc passing through the center of the magnet arranged on the pole center side.
- Figure 9 shows the results of a study of the centrifugal resistance and various characteristics of the rotating electrical machine when the outer peripheral wall thickness D 1 of the rotor core was changed.
- Increasing the rotor core outer peripheral wall thickness D 1 means that the arc passing through the center of the magnet arranged on the pole tip side shown in FIG. It means to set smaller than the passing arc.
- the rotor core outer peripheral wall thickness D1 is described based on a case where the thickness D1 is 0.25 mm, and the respective characteristics are compared in the range of 0.25 to 1.75 mm.
- the centrifugal resistance increased as the outer peripheral wall thickness D1 of the rotor core increased.
- the no-load induced electromotive force does not change until the outer peripheral wall thickness D1 of the rotor core is 0.25 to: 1.0 mm, but it suddenly decreases when it exceeds 1.0 mm. all right.
- the distortion rate of the no-load induced electromotive force hardly changes when the outer peripheral wall thickness D1 of the rotor core is in the range of 0.25 to 1.0 mm. Above this, it showed an increasing trend.
- the cogging torque showed an increasing tendency as the outer peripheral wall thickness D1 of the rotor core increased.
- the anti-centrifugal force was set to 1.4 times the centrifugal force in consideration of the manufacturing error and the reduction factor of the repeated stress in anticipation of the safety factor. From the above study results, the rotor core outer peripheral wall thickness D 1 was selected to be 1.0 mm, which has good rotating electrical machine characteristics and sufficient centrifugal resistance.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/523,778 US7417348B2 (en) | 2002-08-09 | 2003-08-08 | Rotor of permanent magnet rotating electric machine |
US12/169,258 US7768171B2 (en) | 2002-08-09 | 2008-07-08 | Rotor of permanent magnet rotating electric machine |
US12/788,031 US7880358B2 (en) | 2002-08-09 | 2010-05-26 | Rotor of permanent magnet rotating electric machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-232264 | 2002-08-09 | ||
JP2002232264A JP4240949B2 (ja) | 2002-08-09 | 2002-08-09 | 永久磁石式回転電機の回転子 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10523778 A-371-Of-International | 2003-08-08 | ||
US12/169,258 Continuation US7768171B2 (en) | 2002-08-09 | 2008-07-08 | Rotor of permanent magnet rotating electric machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004015841A1 true WO2004015841A1 (ja) | 2004-02-19 |
Family
ID=31711822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010147 WO2004015841A1 (ja) | 2002-08-09 | 2003-08-08 | 永久磁石式回転電機の回転子 |
Country Status (4)
Country | Link |
---|---|
US (3) | US7417348B2 (ja) |
JP (1) | JP4240949B2 (ja) |
CN (1) | CN100553073C (ja) |
WO (1) | WO2004015841A1 (ja) |
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JP4240949B2 (ja) * | 2002-08-09 | 2009-03-18 | 日立アプライアンス株式会社 | 永久磁石式回転電機の回転子 |
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JP2010045932A (ja) * | 2008-08-15 | 2010-02-25 | Ihi Corp | モータ |
JP5433198B2 (ja) | 2008-10-16 | 2014-03-05 | 日立オートモティブシステムズ株式会社 | 回転電機及び電気自動車 |
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EP2549624B1 (en) * | 2011-07-22 | 2019-05-01 | LG Innotek Co., Ltd. | Rotor core for motor |
EP2557661B1 (en) * | 2011-08-10 | 2020-03-11 | LG Innotek Co., Ltd. | Rotor core of motor |
US8633627B2 (en) * | 2011-08-30 | 2014-01-21 | General Electric Company | Electric machine |
JP5791794B2 (ja) * | 2012-05-22 | 2015-10-07 | 三菱電機株式会社 | 永久磁石埋込型回転電機 |
WO2014092957A2 (en) * | 2012-12-14 | 2014-06-19 | Abb Research Ltd. | Permanent magnet machine with hybrid cage and methods for operating same |
JP2015089178A (ja) * | 2013-10-29 | 2015-05-07 | 三菱電機株式会社 | 永久磁石埋込型回転電機 |
CN103997186B (zh) * | 2014-06-06 | 2017-10-03 | 肖俊东 | 直线电机、盘式旋转电机和电机平台 |
JP6649676B2 (ja) * | 2014-10-03 | 2020-02-19 | 株式会社三井ハイテック | 積層鉄心の製造方法 |
JP2016135081A (ja) * | 2015-01-22 | 2016-07-25 | 株式会社神戸製鋼所 | 磁石埋込型回転電機 |
US10734874B2 (en) | 2016-07-09 | 2020-08-04 | Shahin Asgari | Apparatus and method for cogging torque reduction with rotor embedded cylindroid permanent magnets |
CN110875652A (zh) * | 2018-08-30 | 2020-03-10 | 广东美芝制冷设备有限公司 | 电机转子、电机及压缩机 |
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- 2002-08-09 JP JP2002232264A patent/JP4240949B2/ja not_active Expired - Fee Related
-
2003
- 2003-08-08 US US10/523,778 patent/US7417348B2/en not_active Expired - Fee Related
- 2003-08-08 WO PCT/JP2003/010147 patent/WO2004015841A1/ja active Application Filing
- 2003-08-08 CN CNB038186845A patent/CN100553073C/zh not_active Expired - Fee Related
-
2008
- 2008-07-08 US US12/169,258 patent/US7768171B2/en not_active Expired - Fee Related
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2010
- 2010-05-26 US US12/788,031 patent/US7880358B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
JP2004072957A (ja) | 2004-03-04 |
US7880358B2 (en) | 2011-02-01 |
JP4240949B2 (ja) | 2009-03-18 |
US20100231078A1 (en) | 2010-09-16 |
US7417348B2 (en) | 2008-08-26 |
CN1675812A (zh) | 2005-09-28 |
US20080278017A1 (en) | 2008-11-13 |
CN100553073C (zh) | 2009-10-21 |
US20060103251A1 (en) | 2006-05-18 |
US7768171B2 (en) | 2010-08-03 |
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