CN104426265A - Permanent magnet motor rotor structure with high power density and motor with same - Google Patents
Permanent magnet motor rotor structure with high power density and motor with same Download PDFInfo
- Publication number
- CN104426265A CN104426265A CN201310411199.2A CN201310411199A CN104426265A CN 104426265 A CN104426265 A CN 104426265A CN 201310411199 A CN201310411199 A CN 201310411199A CN 104426265 A CN104426265 A CN 104426265A
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- Prior art keywords
- rotor
- magnet steel
- magnetic wedge
- magnetic
- pole
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
- H02K21/222—Flywheel magnetos
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a permanent magnet motor rotor structure with high power density and a motor with the same. The rotor structure comprises a rotor shell, rotor excitation magnetic steels and magnetic wedges, wherein the magnetic wedges are arranged in gaps between N poles and S poles of the rotor excitation magnetic steels. The magnetic wedges have high mechanical strength and the sizes of the magnetic wedges also can be very precise under machining control, so that the magnetic wedges also have a supporting effect on the rotor excitation magnetic steels after being mounted on a rotor, and the mechanical strength of the rotor is enhanced. Furthermore, the thickness of a magnet yoke part between every two rotor excitation magnetic steels is increased so that a magnetic saturation phenomenon is remitted, and a magnetic field capability generated by the rotor excitation magnetic steels is enhanced.
Description
Technical field
The present invention relates to a kind of rotor technical field, specifically, be a kind of rotor structure for permanent magnet motor of high power density and apply its motor.
Background technology
Motor refers to according to the dynamo-electric a kind of calutron that can change of electromagnetic laws realization.Permagnetic synchronous motor (PMSM) because its power density and electric efficiency higher, thus play an increasingly important role in modern industry and household products.In order to improve the power density of motor, the magnet steel of rotor needs to adopt the high magnetic energy permanent magnetic material as neodymium iron boron to make.The magnetic saturation phenomenon of motor rotor core is also just obvious.
The basic structure that one has the permagnetic synchronous motor (PMSM) of external rotor is shown, it armature winding 4 ＇ comprising rotor case 1 ＇, rotor-exciting magnet steel 2 ＇, stator core 3 ＇ and be wrapped on stator core 3 ＇ at Fig. 1,2.Fig. 3 display be the electromagnetic structure of this motor, the N pole of rotor-exciting magnet steel 2 ＇ and S pole are alternately installed on rotor case 1 ＇.Due to the restriction of volume and weight, motor rotor casing 1 ＇ can not do thicker.
As can see from Figure 4, when thinner as rotor case 1 ＇ of rotor yoke, its magnetically saturated phenomenon can be more serious.And the magnetic saturation of rotor yoke necessarily limit the ability that magnet steel produces effective magnetic field.But to many permagnetic synchronous motors, in order to reduce the weight of motor, the shell of rotor must do very thin.In addition, it can also be seen that in the diagram, the most serious place of rotor case 3 ＇ magnetic saturation is positioned at the middle part of excitation magnet steel 2 ＇ of a pair N pole and S pole.
Realize high power density and high efficiency permagnetic synchronous motor (PMSM), the excitation magnet steel that must can make full use of rotor produces the ability in magnetic field.When employing high magnetic energy material as neodymium iron boron, the magnetically saturated degree of rotor yoke is more serious.This makes the performance of excitation magnet steel to be not fully exerted, and the power density of motor is restricted, and electric efficiency cannot fully improve.
Summary of the invention
Main purpose of the present invention is provide a kind of rotor structure for permanent magnet motor of high power density and apply its motor, and it can overcome above-mentioned defect, gives full play to the ability that excitation magnet steel produces excitation field; Improve the power density of permagnetic synchronous motor.
For achieving the above object, the technical solution adopted in the present invention is:
A rotor structure for permanent magnet motor for high power density, it comprises rotor case, rotor-exciting magnet steel, and it also includes magnetic wedge further; Be located in the space between the N pole of described rotor-exciting magnet steel and S pole.Magnetic wedge contacts jointly to form rotor yoke with rotor housing interior surface face, thus makes the thickness of the magnetic wedge of rotor be increased.
Above-mentioned magnetic wedge adopts ferromagnetic material to be made.
Above-mentioned magnetic wedge is one group, is that the ferromagnetic material split adopting electrical sheet such is shaped.
Preferably, above-mentioned magnetic wedge, comprise annulus and be fixedly arranged on one group of montant on annulus, this described group montant is in the space between the N pole and S pole of described rotor-exciting magnet steel.
Preferably, above-mentioned magnetic forming wedge is cylindrical body, and the barrel of described cylindrical body is evenly provided with can the groove of accommodating rotor-exciting magnet steel; Described rotor-exciting magnet steel is evenly installed in described groove, and the bar between each groove is in the space between the N pole and S pole of described rotor-exciting magnet steel.
Preferably, above-mentioned magnetic wedge is the magnet steel magnetic wedge being provided with two symmetrical inclined-planes, and two described inclined-planes are respectively configured as α angle, and described α angle is greater than zero; Described magnet steel magnetic wedge is connected by a pair pole of two described inclined-planes and described rotor-exciting magnet steel.
Above-mentioned have magnetic wedge to adopt permanent-magnet steel to be made.
Preferably, above-mentioned magnetic wedge also includes ferromagnetic magnetic wedge, and described magnet steel magnetic wedge and ferromagnetic magnetic wedge successively interval are located in the space between the N pole of described rotor-exciting magnet steel and S pole.
A kind of permagnetic synchronous motor, it comprises above-mentioned motor rotor construction and stator structure, and described stator structure comprises stator core and is wrapped in the armature winding on stator core.
After adopting technique scheme, because magnetic wedge is made up of the material resemble electrical sheet, there is higher mechanical strength, size also can carry out the very accurate of machining control, thus, it is being installed to after on rotor, also can carry out supporting role to rotor-exciting magnet steel, strengthens the mechanical strength of rotor.In addition, in use, because the thickness of the curvature between two rotor-exciting magnet steel is increased, magnetically saturated phenomenon is eased, and the magnetic field ability that rotor-exciting magnet steel produces is strengthened.
Accompanying drawing explanation
Fig. 1 is the perspective view of existing permagnetic synchronous motor;
Fig. 2 is the combination schematic diagram of existing permagnetic synchronous motor;
Fig. 3 is the electromagnetic structure schematic diagram of existing permagnetic synchronous motor;
Fig. 4 is the Distribution of Magnetic Field situation of existing permagnetic synchronous motor;
Fig. 5 is the perspective view of rotor structure embodiment one of the present invention;
Fig. 6 is the planar structure schematic diagram of rotor structure example example one of the present invention;
Fig. 7 is the perspective view of synchronous machine embodiment one of the present invention;
Fig. 8 is the planar structure schematic diagram of synchronous machine embodiment one of the present invention;
Fig. 9 is the Distribution of Magnetic Field figure of the synchronous machine of the embodiment of the present invention one;
Figure 10 is the perspective view of synchronous machine embodiment two of the present invention;
Figure 11 is the perspective view of synchronous machine embodiment three of the present invention;
Figure 12 is the structural representation of synchronous machine embodiment four of the present invention;
Figure 13 is the magnetizing direction of the magnetic wedge of synchronous machine embodiment four of the present invention and the magnetizing direction of excitation magnet steel and main field circuit schematic diagram;
Figure 14 is the Distribution of Magnetic Field figure of synchronous machine embodiment four of the present invention;
Figure 15 is the structural representation of synchronous machine embodiment five of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment one:
Shown in figure 5,6, the invention discloses a kind of motor rotor construction of high power density, it comprises rotor case 1, rotor-exciting magnet steel 2, magnetic wedge 5, wherein:
Magnetic wedge 3 is made with ferrimagnet, and it is set to one group, is located at respectively in the space between the N pole of rotor-exciting magnet steel 2 and S pole.In the specific implementation, magnetic wedge 5 can be made with the ferromagnetic material that electrical sheet is such, and in addition, magnetic wedge 5 is that employing is split type, is shaped one by one.After manufacturing magnetic wedge 5 with the ferrimagnet that electrical sheet is such, its mechanical strength is very high, size can carry out the very accurate of machining control, thus, magnetic wedge 5 made by ferromagnetic material, be installed to after on rotor, also can carrying out supporting role to rotor-exciting magnet steel 2, strengthening the mechanical strength of rotor.
Shown in figure 9, in use, because the thickness of the curvature between two rotor-exciting magnet steel 2 is increased, magnetically saturated phenomenon is eased, and the magnetic field ability that rotor-exciting magnet steel 2 produces is strengthened.
Shown in figure 7,8, the invention also discloses a kind of permagnetic synchronous motor applying above-mentioned rotor structure, it comprises rotor case 1, rotor-exciting magnet steel 2, stator core 3, armature winding 4 and magnetic wedge 5, wherein:
Armature winding 4 is wrapped on stator core 3.
Same reference diagram 9, because magnetic wedge 3 is made with ferrimagnet, therefore, it not only has mechanical support effect, and the rotor strength of whole motor is strengthened; And make the thickness of the curvature between two rotor-exciting magnet steel 2 be increased, magnetically saturated phenomenon is eased, the magnetic field ability that rotor-exciting magnet steel 2 is produced is strengthened.
Embodiment two:
With reference to shown in Figure 10, it is the structural representation of permagnetic synchronous motor embodiment two of the present invention, and compared with embodiment one, its difference is:
In the present embodiment, magnetic wedge 5, comprises an annulus 51 and is located at one group of montant 52 on annulus 51, and in the present embodiment, this montant 52 is integrally formed with annulus 51, and during use, montant 52 is in the space between the N pole and S pole of rotor-exciting magnet steel 2.
Integrated design, makes assembly precision better control, and assembles more convenient.And better strengthen the mechanical strength of rotor.
Embodiment three:
With reference to shown in Figure 11, it is the structural representation of the embodiment three of permagnetic synchronous motor of the present invention, and compared with embodiment one, its difference is:
In the present embodiment, magnetic wedge 5, it is configured as cylindrical body, and the barrel of this cylindrical body is evenly provided with can the groove 53 of accommodating rotor-exciting magnet steel 2.During use, rotor-exciting magnet steel 2 is evenly installed in this groove 53, and the bar 52 between each groove 53 is in the space between the N pole and S pole of rotor-exciting magnet steel 2.The structure of this magnetic wedge 5, not only increases the rotor yoke thickness in the space between the N pole at rotor-exciting magnet steel 2 of rotor case 1 and S pole, also enhances rotor case 1 simultaneously and to contact with rotor-exciting magnet steel 2 thickness of position.Therefore, it not only has mechanical support effect, and the rotor strength of whole motor is strengthened; And make the thickness of whole rotor yoke be increased, magnetically saturated phenomenon is eased, the magnetic field ability that rotor-exciting magnet steel 2 is produced is strengthened.
Embodiment four:
With reference to shown in Figure 12, it is the structural representation of the embodiment four of permagnetic synchronous motor of the present invention, and compared with embodiment one, its difference is:
In the present embodiment, magnetic wedge 5 adopts high performance permanent magnet steel to be made.And magnetic wedge 5 is provided with two symmetrical inclined-planes 54, this inclined-plane 54 is configured as α angle, and this α angle is greater than zero.When assembling, magnetic wedge 5 is connected by a pair pole of these two inclined-planes 54 and rotor-exciting magnet steel 2.With reference to shown in Figure 13, after the yoke being installed to rotor case 1, the magnetizing direction of magnetic wedge 5 and the difference of rotor-exciting magnet steel 2, both are close to vertical.Passing by a part of magnetic field that the magnetizing direction of magnetic wedge 5 and the contact-making surface of rotor-exciting magnet steel 2 can make excitation magnet steel produce from magnetic wedge 5, thus slows down the magnetic saturation phenomenon of rotor yoke; In addition, the magnetic direction of magnetic wedge 5 and the magnetic direction of rotor-exciting magnet steel 2 can form field circuit, see the magnetic loop 61 of Figure 13.Therefore, magnetic wedge 5 can strengthen the magnetic field of motor gas-gap, thus improves the power density of motor and the efficiency of motor.With reference to shown in Figure 14, therefrom can find out, a part of magnetic field that rotor-exciting magnet steel 2 produces is passed through from magnetic wedge 5, thus alleviates the degree of saturation of rotor yoke.
Embodiment five:
With reference to shown in Figure 15, it is the structural representation of the embodiment five of permagnetic synchronous motor of the present invention, and compared with embodiment four, its difference is:
In the present embodiment, magnetic wedge 5 comprises magnet steel magnetic wedge 55 and ferromagnetic magnetic wedge 56, this magnet steel magnetic wedge 55 is identical with magnetic wedge 5 structure in embodiment four, and have symmetrical inclined-plane 551,552, magnet steel magnetic wedge 55 is connected with a pair pole of rotor-exciting magnet steel 2 by two inclined-planes 551,552.Magnet steel magnetic wedge 55 and ferromagnetic magnetic wedge 56 are located in the space between the N pole of rotor-exciting magnet steel 2 and S pole at interval successively.
After the magnetic wedge 5 of this structure is installed to the yoke of rotor, the magnetizing direction of magnet steel magnetic wedge 55 is different with rotor-exciting magnet steel 2, and both are close to vertical.The magnetizing direction of magnet steel magnetic wedge 55 and passing by from magnetic wedge magnet steel with a part of magnetic field that the contact-making surface of rotor-exciting magnet steel 2 can make rotor-exciting magnet steel 2 produce.This structure, on the one hand, can improve the magnetic saturation degree of rotor yoke, and increase the power density of motor.On the other hand, owing to adopting ferromagnetic material to make magnetic wedge, magnet steel is supported, and the mechanical strength of rotor is enhanced.Moreover, adopt the rotor of mixing magnetic wedge, the motor of high power density can be realized and improve the efficiency of motor.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. a rotor structure for permanent magnet motor for high power density, it comprises rotor case, rotor-exciting magnet steel, it is characterized in that: it also includes magnetic wedge further; Be located in the space between the N pole of described rotor-exciting magnet steel and S pole.
2. the rotor structure for permanent magnet motor of high power density as claimed in claim 1, is characterized in that: described magnetic wedge adopts ferromagnetic material to be made.
3. the rotor structure for permanent magnet motor of high power density as claimed in claim 1 or 2, is characterized in that: described magnetic wedge is one group, is to adopt ferromagnetic material split to be shaped.
4. the rotor structure for permanent magnet motor of high power density as claimed in claim 1 or 2, it is characterized in that: described magnetic wedge, comprise annulus and be fixedly arranged on one group of montant on annulus, this described group montant is in the space between the N pole and S pole of described rotor-exciting magnet steel, and there is face to contact with rotor housing interior surface, jointly to form the yoke of rotor.
5. the rotor structure for permanent magnet motor of high power density as claimed in claim 1 or 2, is characterized in that: described magnetic forming wedge is cylindrical body, and the barrel of described cylindrical body is evenly provided with can the groove of accommodating rotor-exciting magnet steel; Described rotor-exciting magnet steel is evenly installed in described groove, and the bar between each groove is in the space between the N pole and S pole of described rotor-exciting magnet steel; The cylinder that magnetic wedge is formed contacts with rotor housing interior surface face, jointly to form the yoke of rotor.
6. the rotor structure for permanent magnet motor of high power density as claimed in claim 1, is characterized in that: described magnetic wedge is the magnet steel magnetic wedge being provided with two symmetrical inclined-planes, and two described inclined-planes are respectively configured as α angle, and described α angle is greater than zero; Described magnet steel magnetic wedge is connected by a pair pole of two described inclined-planes and described rotor-exciting magnet steel.
7. the rotor structure for permanent magnet motor of high power density as claimed in claim 6, is characterized in that: described in have magnetic wedge to adopt permanent-magnet steel to be made.
8. the rotor structure for permanent magnet motor of high power density as claimed in claim 6, it is characterized in that: described magnetic wedge also includes ferromagnetic magnetic wedge, described magnet steel magnetic wedge and ferromagnetic magnetic wedge successively interval are located in the space between the N pole of described rotor-exciting magnet steel and S pole.
9. a permagnetic synchronous motor, is characterized in that: it comprises the arbitrary described motor rotor construction of claim 1-8 and stator structure, and described stator structure comprises stator core and is wrapped in the armature winding on stator core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310411199.2A CN104426265B (en) | 2013-09-10 | 2013-09-10 | The rotor structure for permanent magnet motor of high power density a kind of and apply its motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310411199.2A CN104426265B (en) | 2013-09-10 | 2013-09-10 | The rotor structure for permanent magnet motor of high power density a kind of and apply its motor |
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| CN104426265A true CN104426265A (en) | 2015-03-18 |
| CN104426265B CN104426265B (en) | 2018-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904951A (en) * | 2017-12-11 | 2019-06-18 | 北京金风科创风电设备有限公司 | Ultra-high-speed permanent magnet disc type motor and mounting method thereof |
| CN110048525A (en) * | 2019-01-12 | 2019-07-23 | 珠海市磐石电子科技有限公司 | Magnetic group unit, its magnetic array, motor, servomechanism installation and mobile devices |
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| CN203607946U (en) * | 2013-09-10 | 2014-05-21 | 峰岹科技（深圳）有限公司 | Permanent magnet motor rotator structure having high power density and motor employing structure |
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| US5109172A (en) * | 1989-04-26 | 1992-04-28 | Pace Sang H L | Permanent magnet motor having diverting magnets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109904951A (en) * | 2017-12-11 | 2019-06-18 | 北京金风科创风电设备有限公司 | Ultra-high-speed permanent magnet disc type motor and mounting method thereof |
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| CN110048525B (en) * | 2019-01-12 | 2021-06-01 | 珠海市磐石电子科技有限公司 | Magnetic group unit, magnetic array thereof, motor, servo device and running device |
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| Publication number | Publication date |
|---|---|
| CN104426265B (en) | 2018-06-01 |
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