CN1725599B - Rotor structure of built-in permanent magnetic brushless motor - Google Patents
Rotor structure of built-in permanent magnetic brushless motor Download PDFInfo
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- CN1725599B CN1725599B CN 200410069380 CN200410069380A CN1725599B CN 1725599 B CN1725599 B CN 1725599B CN 200410069380 CN200410069380 CN 200410069380 CN 200410069380 A CN200410069380 A CN 200410069380A CN 1725599 B CN1725599 B CN 1725599B
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Abstract
This invention discloses a rotor structure of a built-in permanent magnetic brushless motor including a stator composing a winding slot winded by coils on silicon-steel stacked plates, a rotor including several dead tanks having magnetite a bit smaller than the tanks to form a gap between the dead tank and the magnetite in the radial outer edge. The advantage is that the permanent magnetite is only necessary to be processed to long rectangle and the motor rotor is still in the ordinary column.
Description
Technical field
The present invention relates to a kind of rotor structure of built-in permanent magnetic brushless motor, silicon steel sheet forms the dead slot of a F-SP around particularly a kind of permanet magnet that utilizes in the motor rotor, this dead slot must be contained to the zone of the radial direction of the logical magnetic of magnetite, utilize the magnetoresistive of this dead slot to adjust the distribution of the space magnetic flux density between motor stator and rotor, make the back emf waveform of motor and the structure of the target that torque characteristics reaches design.
Background technology
Motor (motor) is indispensable important device in modern industry, it is widely used in various electrical equipment, transportation system ... etc. purposes, its main operating principle is mechanical energy for converting electric energy to, and does rotation or vibration with driving device ... wait start.How to utilize and to reach big torque in limited volume and material, and keep high-effect and high control accuracy aspect, built-in permanent magnetic brushless motor is best selection all often.
Known permanent magnetic brushless motor structure, promptly as U.S. Pat 6,177, No. 745 disclose, utilize the magnetite of different poles, change the material and the shape of this magnetite, to adjust its magnetic flux density and to increase its reluctance torque.In addition, as U.S. Pat 6,340,857 disclose, it utilizes two to separate magnetites, in wherein being provided with an insulating barrier, this insulating barrier can suppress vortex flow, produces to avoid magnetite " thermal demagnetization " effect, above-mentioned two patents are all at the designed structure of improving on the rotor permanet magnet.
The known permanent magnet motor architecture advances of another type, see also U.S. Pat 6,008,559, its in rotor the two poles of the earth magnetite and rotor outer rim both sides between, directly dig and establish a dead slot, can avoid " magnet short-cut path " effect, further can promote torque, and can fall low logging effect (Cogging Torque), further more can reduce vibrations and noise.See also U.S. Pat 6,034,458, it discloses a kind of will hollowing out between two magnetic poles, and forming rotor is the structure of a non-positive toroidal, and forms the dead slot of avoiding magnet short-cut path.See also U.S. Pat 6,218,753, it changes the two poles of the earth magnetite and the outer intermarginal dead slot of rotor into the asymmetric dead slot, and is improved on its package assembly.See also U.S. Pat 6,674,205, it adds magnetite in cavity on former known magnetic resistance motor rotor, and forms an auxiliary magnetic circuit, is pre-formed a magnetic field to promote torque.
Known built-in permanent magnetic motor is all done an adjustment in its permanet magnet shape and arrangement mode, perhaps the silicon steel sheet of rotor is made the air gap of multilayer, to form the structure of a high efficiency and high torque (HT), but aforementioned two kinds of structure-improveds, no matter be that its magnetite manufacture difficulty is higher, otherwise here the too complicated disadvantages of shape that is exactly its rotor silicon steel sheet exists, and therefore causes when making magnetite or rotor silicon steel sheet precision are not good, easily causes problems such as usefulness, torque be not good.
Summary of the invention
The rotor structure that the purpose of this invention is to provide a kind of built-in permanent magnetic brushless motor under the prerequisite of the processing procedure of comparatively simple motor and assembling, is realized high efficiency, high torque (HT) and low cogging torque.
In order to achieve the above object, the invention provides a kind of rotor structure of built-in permanent magnetic brushless motor, comprising:
One stator, this stator is made of coiling on the silicon steel sheet, and this stator comprises several winding slots; And
One rotor, comprise several dead slots in this rotor, described dead slot is contained to the zone of the radial direction of permanet magnet magnetic flux, the inner correspondence of this dead slot is provided with the magnetite that size, volume are slightly less than dead slot, this dead slot and magnetite are intermarginal outside rotor radial to have a gap at least to form, and described gap is included in the part of the radial direction of permanet magnet magnetic flux.
The present invention utilizes silicon steel sheet around the permanet magnet in the motor rotor to form the dead slot of a F-SP, this dead slot must be contained to the zone of the logical magnetic direction of magnetite, utilize the magnetoresistive of this dead slot to adjust the distribution of the space magnetic flux density between motor stator and rotor, make and the distribution of the space magnetic flux density between motor stator and rotor make motor back emf waveform and torque characteristics reach the target of design.The advantage of this kind design is that the profile of permanet magnet does not need special design, only need be made into general long square type gets final product, and the profile of motor rotor also can keep general column type, so can reach the structure of high efficiency, high torque (HT) and low cogging torque permanent magnet motor under most economical cost of manufacture.
The present invention can reduce armature reaction, promote reluctance torque, reduce electric humorous involving improves the electrical system power factor.
In conjunction with the accompanying drawings to the detailed description of the embodiment of the invention, can further understand above-mentioned purpose of the present invention, effect and technology contents by following.
Description of drawings
Fig. 1 is the cut-away section schematic side view that internally-arranged type brushless motor first of the present invention is implemented structure;
Fig. 2 is the diagrammatic cross-sectional side elevation that internally-arranged type brushless motor second of the present invention is implemented structure;
Fig. 3 is the waveform schematic diagram that Fig. 1 of the present invention and structure that Fig. 2 discloses can solve torque waveform generation surging.
Description of reference numerals: 1 stator; 11 winding slots; 2 rotors; 21 first dead slots; 211 first gaps; 22 first magnetites; 3 stators; 31 winding slots; 4 rotors; 41 second dead slots; 411 second gaps; 42 second magnetites; 5 surgings.
Embodiment
See also internally-arranged type brushless motor of the present invention shown in Figure 1 first and implement the cut-away section schematic side view of structure, wherein rotor 2 profiles of motor are positive circular, and the profile of first magnetite 22 is square.Again according to the motor number of poles of desire design, first magnetite 22 on average is built in the rotor 2, F-SP is arranged and the first suitable dead slot 21 around desiring to reach magnetite 22, behind these first dead slot, 21 ccontaining first magnetites 22, at least remain with first gap 211, and present embodiment to disclose be respectively to remain with first gap 211 at first magnetite, 22 two ends, certain those skilled in the art, also can difform gap be set in the arbitrary place of first magnetite, 22 outer rims, be constructed means with present embodiment all.Directly design the rotor 2 of whole motor during design, comprise material (silicon steel sheet) that rotor 2 constitutes, institute's desire forms the shape of first dead slot 21 and the width and the height of first magnetite 22.Silicon steel sheet is done a punch forming, after being stacked into the stack length of being desired, be fixed into cylindric with automatic riveting or rivet again, to design and produce the square permanet magnet surface of finishing again coats viscose and directly inserts in the dead slot of rotor 2, so just finish the making of this motor rotor 2, utilize the setting in this first gap 211, can effectively prevent the phenomenon of magnetic line of force short circuit, reach the purpose of high efficiency, high torque (HT) and low cogging torque permanent magnet motor.
In addition, the stator 1 of its motor has several winding slots 11, and the present invention do not carry out the improvement of configuration aspects at this stator 1, so do not give unnecessary details at this.
See also internally-arranged type brushless motor of the present invention shown in Figure 2 second and implement the diagrammatic cross-sectional side elevation of structure, wherein stator 3 parts of this motor are not also made the change of any structure aspect, also do not do and give unnecessary details.The improved part of present embodiment, still be that second magnetite 42 of rotor 4 and the gap of second dead slot 41 are provided with, with not existing together of first embodiment, be to be designed to long rectangle for this second magnetite 42 is non-, it is that the two ends, a wherein long limit of this second magnetite 42 are dissectd with the angle of inclination, to form hexagonal second magnetite 42, second dead slot 41 is designed to a long rectangle simultaneously, so that second magnetite 42 is when being placed in second dead slot 41, just form second gap 411 with two triangular shapes, this second gap 411 is positioned at the radial direction of magnetic flux, also utilize the setting in this second gap 411, can effectively prevent " magnet short-cut path " phenomenon, reach high efficiency, the purpose of high torque (HT) and low cogging torque permanent magnet motor.
The disclosed permanent magnetic brushless motor of above-mentioned two embodiment, its structure comprises following characteristics:
(1) permanet magnet that wherein includes the even number utmost point is built in the rotor place, and the material of permanet magnet, size, shape are all identical.
(2) rotor of permanent magnet motor is formed by the silicon steel sheet stack, and each silicon steel sheet all has the dead slot that is slightly larger than permanet magnet shape, size, after permanet magnet is inserted, maintains a gap at least.
(3) dead slot around the permanet magnet directly is connected with permanet magnet, dead slot and the residual gap of inserting permanet magnet are formed in one, do not have the material of any former silicon steel sheet, this gap is not limited to Any shape, but must be included in the part of the radial direction of the logical magnetic of permanet magnet.
(4) the permanent magnetic brushless motor rotor is inserted in the permanet magnet dead slot, must leave the silicon steel sheet of sufficient mechanical strength, with support rotor and separate the permanet magnet of opposed polarity.
See also the waveform schematic diagram that Fig. 1 of the present invention shown in Figure 3 and structure that Fig. 2 discloses can solve torque waveform generation surging, originally torque sine wave has a surging 5 in its positive half cycle trailing edge and each generation of negative half period leading edge, rotor structure via Fig. 1 and Fig. 2, can eliminate this surging 5, recover the sinusoidal waveform that levels off to of original curve smoothing, also can eliminate motor and change phenomenon because of protruding ripple produced.
Disclose by Fig. 1 to Fig. 3, can understand disclosed technological means, really can reach the distribution that reduces armature reaction, promotes the space magnetic flux density between reluctance torque and adjustment motor stator and rotor, make motor back emf waveform and torque characteristics reach design object.
The above only is preferred embodiment of the present invention, can not limit the scope that the present invention is implemented with this.Therefore, all equalizations of doing according to claim of the present invention change and modify, and all should still belong to protection scope of the present invention.
Claims (5)
1. the rotor structure of a built-in permanent magnetic brushless motor comprises:
One stator, this stator is made of coiling on the silicon steel sheet, and this stator comprises several winding slots; And
One rotor, comprise several dead slots in this rotor, described dead slot is contained to the zone of the radial direction of permanet magnet magnetic flux, the inner correspondence of this dead slot is provided with the magnetite that size, volume are slightly less than dead slot, this dead slot and magnetite are intermarginal outside rotor radial to have a gap at least to form, and described gap is included in the part of the radial direction of permanet magnet magnetic flux.
2. the rotor structure of built-in permanent magnetic brushless motor as claimed in claim 1, wherein the material of the permanet magnet of this rotor, size, shape are all identical.
3. the rotor structure of built-in permanent magnetic brushless motor as claimed in claim 1, wherein this rotor is formed by the silicon steel sheet stack.
4. the rotor structure of built-in permanent magnetic brushless motor as claimed in claim 1, wherein the profile of this magnetite is a long rectangle.
5. the rotor structure of built-in permanent magnetic brushless motor as claimed in claim 1, wherein the profile of this magnetite is that two ends, long rectangle one long limit are dissectd with the angle of inclination, to form a hexagonal profile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069380 CN1725599B (en) | 2004-07-21 | 2004-07-21 | Rotor structure of built-in permanent magnetic brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069380 CN1725599B (en) | 2004-07-21 | 2004-07-21 | Rotor structure of built-in permanent magnetic brushless motor |
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| Publication Number | Publication Date |
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| CN1725599A CN1725599A (en) | 2006-01-25 |
| CN1725599B true CN1725599B (en) | 2010-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410069380 Active CN1725599B (en) | 2004-07-21 | 2004-07-21 | Rotor structure of built-in permanent magnetic brushless motor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007060248A1 (en) * | 2007-12-14 | 2009-06-18 | Robert Bosch Gmbh | Disc pack for an electric motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5679995A (en) * | 1992-08-12 | 1997-10-21 | Seiko Epson Corporation | Permanent magnet rotor of brushless motor |
| US6008559A (en) * | 1997-07-22 | 1999-12-28 | Matsushita Electric Industrial Co., Ltd. | Motor using a rotor including an interior permanent magnet |
| US6177745B1 (en) * | 1997-09-26 | 2001-01-23 | Fujitsu General Limited | Permanent magnet rotor type electric motor |
| CN1508938A (en) * | 2002-12-19 | 2004-06-30 | 松下电器产业株式会社 | Motor |
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2004
- 2004-07-21 CN CN 200410069380 patent/CN1725599B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5679995A (en) * | 1992-08-12 | 1997-10-21 | Seiko Epson Corporation | Permanent magnet rotor of brushless motor |
| US6008559A (en) * | 1997-07-22 | 1999-12-28 | Matsushita Electric Industrial Co., Ltd. | Motor using a rotor including an interior permanent magnet |
| US6177745B1 (en) * | 1997-09-26 | 2001-01-23 | Fujitsu General Limited | Permanent magnet rotor type electric motor |
| CN1508938A (en) * | 2002-12-19 | 2004-06-30 | 松下电器产业株式会社 | Motor |
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| Publication number | Publication date |
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| CN1725599A (en) | 2006-01-25 |
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