CN108880028B - Permanent magnet motor magnetic pole arrangement structure capable of generating sine magnetic flux - Google Patents
Permanent magnet motor magnetic pole arrangement structure capable of generating sine magnetic flux Download PDFInfo
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- CN108880028B CN108880028B CN201710322889.9A CN201710322889A CN108880028B CN 108880028 B CN108880028 B CN 108880028B CN 201710322889 A CN201710322889 A CN 201710322889A CN 108880028 B CN108880028 B CN 108880028B
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- 230000004907 flux Effects 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005457 optimization Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The utility model provides a permanent magnet motor magnetic pole arrangement structure that can produce sinusoidal magnetic flux, includes magnetic conduction backplate and a plurality of magnetic pole, the magnetic pole all is the sheet structure that has certain thickness, have top surface, bottom surface and two opposite side portions of mutual 180, two side portions are perpendicular with top surface and bottom surface, a plurality of magnetic poles are fixed on magnetic conduction backplate along the length direction of magnetic conduction backplate horizontally and horizontally in proper order, the wiring of the tip that two of a plurality of magnetic poles are sharp angle form each other in parallel to with the length direction of magnetic conduction backplate, every magnetic pole is the sinusoidal law change of first half cycle in the length of width direction perpendicular with the length direction of magnetic conduction backplate roughly, the inside magnetic field direction of two adjacent magnetic poles is opposite, the inside magnetic field direction of a plurality of magnetic poles is perpendicular with magnetic conduction backplate. The magnetic pole arrangement structure of the permanent magnet motor generates sinusoidally-changed magnetic flux in the armature winding, so that the back electromotive force waveform of the motor has extremely high sine degree, and the stability of electromagnetic torque is improved.
Description
Technical Field
The invention relates to the field of motors, in particular to a permanent magnet motor magnetic pole arrangement structure capable of generating sinusoidal magnetic flux, which is suitable for the field of motors in electrical engineering, and particularly relates to a permanent magnet motor electromagnetic design.
Background
At present, most permanent magnet motors adopt a rotor structure, and a rotor magnetic field waveform generated by the rotor structure is in a square wave form, and contains a large number of higher harmonics. The higher harmonics of the magnetic field can have adverse effects on the performance of the permanent magnet motor, and mainly comprise: (1) High-frequency iron loss is generated in the motor iron core, so that the motor efficiency is reduced; (2) The counter potential harmonic content of the motor is increased, and the control precision of the motor is affected; (3) the electromagnetic torque of the motor generates larger fluctuation; (4) The higher harmonic disperses the magnetic field energy of the magnetic pole, weakens the energy of the base wave and reduces the utilization rate of the magnetic steel. Therefore, improving the sine of the rotor magnetic field is of great significance to improving the performance of the permanent magnet motor.
In the structural design of a motor rotor, a method for optimally designing magnetic poles is proposed in literature to improve the waveform of a rotor magnetic field. Rotor structure optimization of a permanent magnet motor mainly comprising two rotor types:
(1) Embedded permanent magnet motor
For the embedded permanent magnet motor of the magnetic steel, in order to improve the sine degree of the magnetic field of the rotor, the main adopted methods include the methods of adjusting the included angle and the number of magnetic poles of the embedded magnetic steel, the number of the magnetic pole layers, changing the appearance of the silicon steel sheet of the rotor and the like. The method can only design the motor with specific size, and if the size parameter of the motor is changed, the corresponding optimization variable is correspondingly changed, so that the method has no universality and can improve the development cost of the motor design. When the motor operates, the air gap magnetic field is distorted due to the saturation effect possibly generated by the rotor silicon steel sheet, and the sine degree determined during design cannot be achieved. Meanwhile, the complexity of the motor structure can be increased due to the optimization of the magnetic field of the embedded permanent magnet motor, so that the motor processing difficulty is increased, and the motor processing cost is increased.
(2) Surface-mounted permanent magnet motor
For surface-mounted permanent magnet motors, the currently mainly adopted method comprises the use of a Halbach magnetic pole array or a segmented magnetic pole array similar to PWM waveforms for improving the sine degree of a rotor magnetic field. The Halbach type magnetic steel has the advantages of high magnetizing difficulty, low yield, and large required magnetic steel body, and can cause the improvement of motor cost. For the magnetic pole arrangement method of PWM waveform segmentation, the magnetic field optimization variable is more, the optimization difficulty is higher, and the optimization parameters are changed along with the motor size, so that the method has no universality.
Disclosure of Invention
In order to solve the technical problems, the magnetic flux of the permanent magnets which are interlinked in each phase winding is changed in a sine form, so that the sine degree of counter potential waveforms of the motor is improved, and the stability of electromagnetic torque is improved. The invention provides a novel magnetic pole arrangement structure of a surface-mounted permanent magnet motor, which can generate sine magnetic flux in a motor armature winding by carrying out specific constraint on the appearance of surface-mounted magnetic steel.
The invention relates to a permanent magnet motor magnetic pole arrangement structure capable of generating sinusoidal magnetic flux, which comprises a magnetic conduction backboard and a plurality of magnetic poles, wherein the magnetic poles are of a sheet structure with a certain thickness, and are provided with a top surface, a bottom surface and two side edge parts which are opposite to each other by 180 degrees, the two side edge parts are perpendicular to the top surface and the bottom surface, two ends of one side edge part are respectively connected with two ends of the other side edge part to form two sharp-angle-shaped end parts of the magnetic poles,
the magnetic poles are sequentially and continuously fixed on the magnetic conduction backboard in parallel along the length direction of the magnetic conduction backboard, the connecting lines of the two sharp-angle-shaped end parts of the magnetic poles are mutually parallel and form an included angle with the length direction of the magnetic conduction backboard,
the length of each magnetic pole in the width direction perpendicular to the length direction of the magnetic conduction backboard is changed in a sine rule of the first half period, the internal magnetic field directions of two adjacent magnetic poles are opposite, and the internal magnetic field directions of the magnetic poles are perpendicular to the magnetic conduction backboard.
Further, the top and bottom surfaces of the poles are generally quadrilateral.
Further, one side edge part of the magnetic pole is a curved surface with the top protruding outwards at the rear part, and the other side edge part is a curved surface with the top protruding outwards at the front part.
Further, a coordinate system is constructed with a line passing through the left end of the magnetic pole in the width direction of the magnetic conductive back plate as a vertical axis and a line passing through the lower end of the magnetic pole in the length direction of the magnetic conductive back plate as a horizontal axis, and a point (L) is defined between a curve of the lower side and a curve of the upper side of the top and bottom surfaces of the magnetic pole on the magnetic conductive back plate 1 /2，W 1 And/2) is centrosymmetric;
the boundary function of the upper curves of the top surface and the bottom surface of the magnetic pole fixed on the magnetic conduction backboard is as follows:
wherein t satisfies
W 1 The length of a single magnetic pole on the magnetic conduction backboard in the width direction perpendicular to the length direction of the magnetic conduction backboard; l (L) 1 The length of a single magnetic pole on the magnetic conduction backboard in the length direction of the magnetic conduction backboard; a is each of the curvesThe distance between the point and the left end part of the magnetic pole in the length direction of the magnetic conduction backboard; θ is the angle between the connecting line of the end part of the magnetic pole and the length direction of the magnetic conduction backboard, h 1 The distance between each point on the curve and the length direction extending line passing through the left end part of the magnetic pole.
The magnetic pole arrangement structure of the permanent magnet motor provided by the invention has the following beneficial effects:
(1) The magnetic pole arrangement structure of the permanent magnet motor provided by the invention can generate magnetic flux changing according to sine in the armature winding when the motor works, so that the back electromotive force waveform of the motor has extremely high sine degree, and the stability of the electromagnetic torque of the motor is improved.
(2) The permanent magnet shape constraint condition parameters provided by the invention are fewer, and the permanent magnet shape constraint condition parameters are suitable for various motor sizes and have strong universality.
Drawings
Fig. 1 is a plan view of a pole arrangement structure of a permanent magnet motor of the present invention;
fig. 2 is a perspective view of a pole arrangement structure of a permanent magnet motor according to the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. Those skilled in the art will recognize that the present invention is not limited to the drawings and the following examples.
In the embodiment of the invention, as shown in fig. 1 and 2, the magnetic pole arrangement structure of the permanent magnet motor comprises a magnetic conductive back plate 1 and a plurality of magnetic poles, wherein only 4 magnetic poles are shown in fig. 1 and 2, the shape and the size of each magnetic pole are the same, and the adjacent magnetic poles have the same arrangement relation. The magnetic poles are of sheet structures with certain thickness, each magnetic pole is provided with a top surface, a bottom surface and two opposite side edge parts, the top surface and the bottom surface are in a quadrilateral shape, the two side edge parts are perpendicular to the top surface and the bottom surface respectively, two ends of one side edge part are connected with two ends of the other side edge part respectively, and two sharp corner-shaped end parts of the magnetic pole are formed. One side edge part of the magnetic pole is a curved surface of the top protruding outwards at the rear part, the other side edge part is a curved surface of the top protruding outwards at the front part, and the two side edge parts are mutually reversely arranged at 180 degrees.
The following describes the arrangement relationship between adjacent magnetic poles in the present embodiment, taking the adjacent first magnetic pole 2 and second magnetic pole 3 as an example.
The first magnetic pole 2 and the second magnetic pole 3 are sequentially and continuously arranged on the magnetic conduction backboard 1 in parallel along the length direction L of the magnetic conduction backboard 1 (namely, the two adjacent sharp angle-shaped ends of the first magnetic pole 2 and the second magnetic pole 3 are connected when seen from the length direction perpendicular to the magnetic conduction backboard 1). The connecting line of the two sharp-angle-shaped ends of the first magnetic pole 2 and the connecting line of the two sharp-angle-shaped ends of the second magnetic pole 3 are mutually parallel and form a certain angle theta with the length direction L of the magnetic conduction backboard 1, so that the adjacent ends 4 and 5 of the first magnetic pole 2 and the second magnetic pole 3 can be mutually staggered, and the magnetic leakage phenomenon of the first magnetic pole 2 and the second magnetic pole 3 at the sharp-angle-shaped ends is reduced. The lengths of the first magnetic pole 2 and the second magnetic pole 3 in the width direction W perpendicular to the length direction L of the magnetically conductive back plate 1 change substantially in a sinusoidal law of the first half period.
Specifically, as shown in fig. 1, a coordinate system is constructed with a line passing through the left end of the magnetic pole in the width direction of the magnetically conductive back plate 1 as the vertical axis and a line passing through the lower end of the magnetic pole in the length direction of the magnetically conductive back plate 1 as the horizontal axis, and the points (L) are about the lower-side curves and the upper-side curves of the top surfaces and the bottom surfaces of the first magnetic pole 2 and the second magnetic pole 3 on the magnetically conductive back plate 1 1 /2，W 1 And/2) is centrosymmetric. Wherein, the boundary function of the upper curves of the top surface and the bottom surface of the first magnetic pole 2 and the second magnetic pole 3 on the magnetic conduction backboard 1 is:
wherein t satisfies
W 1 The length of a single magnetic pole on the magnetic conduction backboard in the width direction perpendicular to the length direction of the magnetic conduction backboard; l (L) 1 Is a single on the magnetic conductive backboardThe lengths of the magnetic poles in the length direction of the magnetic conductive backboard; a is the distance between each point on the curve and the left end part of the magnetic pole in the length direction of the magnetic conduction backboard; θ is the angle between the connecting line of the end part of the magnetic pole and the length direction of the magnetic conduction backboard, h 1 The distance between each point on the curve and the length direction extending line passing through the left end part of the magnetic pole.
The directions of the internal magnetic fields of the adjacent first magnetic poles 2 and the adjacent second magnetic poles 3 are opposite, the top surface of the first magnetic pole 2 is an N pole, the bottom surface is an S pole, the top surface of the second magnetic pole 3 is an S pole, and the bottom surface is an N pole; the internal magnetic field direction of the first magnetic pole 2 and the second magnetic pole 3 is perpendicular to the magnetic conductive backboard 1.
In the embodiment of the present invention, only four magnetic poles are sequentially arranged, and it will be understood by those skilled in the art that a plurality of identical magnetic poles can be arranged side by side in a straight line in the outer side of the first and second magnetic poles shown in fig. 1 and 2 in the sequence, and the arrangement mode between the magnetic poles is the same as that between the first and second magnetic poles 2 and 3, and the present invention can be used for a linear motor; if used in a barrel motor, the poles are arranged in a barrel around.
During operation of the motor, the magnetic poles sweep the boundary line of the pole shoe along the movement direction (the movement direction is the length direction L of the magnetic conduction backboard), the boundary line of the pole shoe is generally perpendicular to the movement direction, and the length of the section of the magnetic pole sweeping the boundary line of the pole shoe changes in a sine law as the length of each magnetic pole in the width direction W approximately changes in a sine law of the first half period.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a permanent magnet motor magnetic pole arrangement structure that can produce sinusoidal magnetic flux, includes magnetic conduction backplate and a plurality of magnetic pole, its characterized in that: the magnetic poles are all in a sheet structure with a certain thickness and are provided with a top surface, a bottom surface and two side edge parts, the two side edge parts are perpendicular to the top surface and the bottom surface, the top surface and the bottom surface of the magnetic pole are in a quadrilateral shape, one side edge part of the magnetic pole is a curved surface with the top protruding outwards at the rear part, the other side edge part is a curved surface with the top protruding outwards at the front part, the two side edge parts are opposite to each other by 180 degrees, the two ends of one side edge part are respectively connected with the two ends of the other side edge part to form two sharp-angle-shaped end parts of the magnetic pole,
the magnetic poles are sequentially and continuously fixed on the magnetic conduction backboard in parallel along the length direction of the magnetic conduction backboard, the connecting lines of the two sharp-angle-shaped end parts of the magnetic poles are mutually parallel and form an included angle with the length direction of the magnetic conduction backboard, so that the end parts of the adjacent magnetic poles can be mutually staggered,
the length of each magnetic pole in the width direction perpendicular to the length direction of the magnetic conduction backboard is changed in a sine rule of the first half period, the internal magnetic field directions of two adjacent magnetic poles are opposite, and the internal magnetic field directions of the magnetic poles are perpendicular to the magnetic conduction backboard.
2. The permanent magnet motor pole arrangement according to claim 1, wherein: a coordinate system is constructed by taking a line passing through the left end part of the magnetic pole in the width direction of the magnetic conduction backboard as a vertical axis and a line passing through the lower end part of the magnetic pole in the length direction of the magnetic conduction backboard as a horizontal axis, and the curves of the lower sides and the upper sides of the top surface and the bottom surface of the magnetic pole on the magnetic conduction backboard are in central symmetry about points (L1/2 and W1/2);
the boundary function of the upper curves of the top surface and the bottom surface of the magnetic pole fixed on the magnetic conduction backboard is as follows:
wherein t satisfies the following formula:
w1 is the length of a single magnetic pole on the magnetic conduction backboard in the width direction perpendicular to the length direction of the magnetic conduction backboard; l1 is the length of a single magnetic pole on the magnetic conduction backboard in the length direction of the magnetic conduction backboard; a is the distance between each point on the curve and the left end part of the magnetic pole in the length direction of the magnetic conduction backboard; θ is the angle between the connecting line of the end part of the magnetic pole and the length direction of the magnetic conduction backboard, and h1 is the distance between each point on the curve and the length direction extension line passing through the end part of the left end of the magnetic pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710322889.9A CN108880028B (en) | 2017-05-09 | 2017-05-09 | Permanent magnet motor magnetic pole arrangement structure capable of generating sine magnetic flux |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710322889.9A CN108880028B (en) | 2017-05-09 | 2017-05-09 | Permanent magnet motor magnetic pole arrangement structure capable of generating sine magnetic flux |
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| CN108880028A CN108880028A (en) | 2018-11-23 |
| CN108880028B true CN108880028B (en) | 2024-01-02 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9001473D0 (en) * | 1990-04-24 | 1990-04-24 | Elmo Ab | synchronous |
| CA2331835A1 (en) * | 1998-05-08 | 1999-11-18 | Juha Pyrhonen | Permanent magnet synchronous machine |
| CN101699713A (en) * | 2009-10-28 | 2010-04-28 | 南京航空航天大学 | Rotor sectional type flux switching motor and method for improving sine degree of back electromotive force thereof |
| CN103414301A (en) * | 2013-08-15 | 2013-11-27 | 南京信息工程大学 | Axial magnetic field ironless permanent magnet motor with split mounting type magnetic poles |
| JP2015153790A (en) * | 2014-02-11 | 2015-08-24 | 日東電工株式会社 | Permanent magnet and method of producing permanent magnet |
| CN105262254A (en) * | 2015-09-29 | 2016-01-20 | 河海大学 | Surface-built-in mixed speed-regulating permanent magnet synchronous motor |
| CN205407444U (en) * | 2016-02-18 | 2016-07-27 | 华南理工大学 | Surface mosaic formula selfstarting permanent magnet synchronous motor rotor |
| CN207166236U (en) * | 2017-05-09 | 2018-03-30 | 合肥硬核派科技有限公司 | A kind of permanent magnet motor magnetic pole arrangement architecture for producing sinusoidal magnetic flux |
-
2017
- 2017-05-09 CN CN201710322889.9A patent/CN108880028B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9001473D0 (en) * | 1990-04-24 | 1990-04-24 | Elmo Ab | synchronous |
| CA2331835A1 (en) * | 1998-05-08 | 1999-11-18 | Juha Pyrhonen | Permanent magnet synchronous machine |
| CN101699713A (en) * | 2009-10-28 | 2010-04-28 | 南京航空航天大学 | Rotor sectional type flux switching motor and method for improving sine degree of back electromotive force thereof |
| CN103414301A (en) * | 2013-08-15 | 2013-11-27 | 南京信息工程大学 | Axial magnetic field ironless permanent magnet motor with split mounting type magnetic poles |
| JP2015153790A (en) * | 2014-02-11 | 2015-08-24 | 日東電工株式会社 | Permanent magnet and method of producing permanent magnet |
| CN105262254A (en) * | 2015-09-29 | 2016-01-20 | 河海大学 | Surface-built-in mixed speed-regulating permanent magnet synchronous motor |
| CN205407444U (en) * | 2016-02-18 | 2016-07-27 | 华南理工大学 | Surface mosaic formula selfstarting permanent magnet synchronous motor rotor |
| CN207166236U (en) * | 2017-05-09 | 2018-03-30 | 合肥硬核派科技有限公司 | A kind of permanent magnet motor magnetic pole arrangement architecture for producing sinusoidal magnetic flux |
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Address after: 313009, No. 585-483, Shiyuan West Road, Dongqian Street, Nanxun District, Huzhou City, Zhejiang Province Patentee after: Huzhou Hardcore Pai Technology Co.,Ltd. Country or region after: China Address before: 230000 Hefei, Anhui economic and Technological Development Zone, east of Hean Road, Pearl Plaza, one of the Nordic street D01 area. Patentee before: HEFEI YINGHEPAI TECHNOLOGY CO.,LTD. Country or region before: China |
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Effective date of registration: 20240407 Address after: No. 2, Building C2, Science and Technology SME Accelerator Park, No. 129 Cuihu Fifth Road, Economic Development Zone, Tongling City, Anhui Province, 244000 Patentee after: TONGLING HARDCORE MOTOR TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 313009, No. 585-483, Shiyuan West Road, Dongqian Street, Nanxun District, Huzhou City, Zhejiang Province Patentee before: Huzhou Hardcore Pai Technology Co.,Ltd. Country or region before: China |