CN101640464A - Rotor of brushless DC motor - Google Patents
Rotor of brushless DC motor Download PDFInfo
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- CN101640464A CN101640464A CN200810053991A CN200810053991A CN101640464A CN 101640464 A CN101640464 A CN 101640464A CN 200810053991 A CN200810053991 A CN 200810053991A CN 200810053991 A CN200810053991 A CN 200810053991A CN 101640464 A CN101640464 A CN 101640464A
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Abstract
The invention discloses a rotor of a brushless DC motor. The brushless DC motor comprises a stator, a rotor positioned in the stator and a rotating shaft positioned at the center position of the rotor, wherein the rotor comprises a rotor core 51 which is arranged in a motor stator 40 and can rotate; the rotor core 51 is provided with at least two pairs of first permanent magnets 52a which are spaced by certain distance and radially distributed along the circumferential direction; second permanent magnets 52b are arranged between end parts of two pairs of adjacent first permanent magnets 52a facing the rotating shaft 60; and the first permanent magnets 52a are ferrite permanent magnets, and the second permanent magnets 52b are NdFeB permanent magnets. The rotor of the brushless DC motor adopts a hybrid permanent magnet structure consisting of NdFeB and ferrite to make magnetic lines of a motor magnetic system more and dense and make the operation of the motor have enough torque. The rotor improves motor performance and can fully meet the requirements of users in various industries.
Description
Technical field
The present invention relates to field of mechanical technique, particularly relate to a kind of rotor of brshless DC motor.
Background technology
At present, in view of brshless DC motor had both had advantages such as ac motor structure is simple, reliable, easy to maintenance, have the characteristic of direct current machine operational efficiency height, no excitation loss, good speed adjustment features again, therefore the application in every profession and trade is increasingly extensive.
In general, brushless direct-current (Brushless Direct Current, BLDC) motor is as a kind of special permagnetic synchronous motor, referring to Fig. 1, Fig. 1 is a kind of horizontal sectional drawing of existing brshless DC motor, it comprises: be installed in the stator 10 in the motor hood (not shown), be installed in said stator 10 inside, be used to form magnetic field and with transmission of torque to outside rotor 20 and the rotating shaft 30 of inserting above-mentioned rotor 20 centres, wherein be separated with the gap between stator 10 and the rotor 20, externally during power connection said stator 10, produce electromagnetic action between rotor 20 and the stator 10, thereby rotor 20 is rotated with rotating shaft 30.
Said stator 10 comprises: yoke 11 in the form of a ring, several teeth 13, its inner surface along radial direction from above-mentioned yoke 11 is given prominence to towards described rotor 20, on its circumferencial direction, be formed with slit 12, and twine on the above-mentioned tooth 13 and the coil 14 that is connected with external power source at a distance of certain intervals.
Above-mentioned rotor 20 comprises: 6 rotor cores 21 of Xing Chenging along the circumferential direction; 6 permanent magnets 22, described 6 permanent magnets 22 along the circumferential direction are inserted in respectively in described each rotor core 21, and along the circumferential direction alternately arrange with the N utmost point and the S utmost point.
But referring to Fig. 2, Fig. 3, Fig. 2 and Fig. 3 are respectively the stereogram of existing brushless DC motor rotor and look closely schematic diagram.Generally, included 6 permanent magnets 22 of this brushless DC motor rotor are the ferritic permanent magnet of employing.Though it is low that ferrite has price, temperature characterisitic is good, corrosion-resistant, etc. advantage, but owing to adopt less (need to prove of surplus induction of ferritic permanent magnet, permanent magnet from magnetize to technology saturated and remove external magnetic field after, there is part magnetic to decorporate, magnetic flux density in permanent magnetic material under the residue is called as surplus induction), thereby motor rotation does not have enough torques, the behavior in service deficiency that causes brshless DC motor easily can't fully satisfy the user demand of user in productive life.In addition, as Fig. 1, Fig. 2, shown in Figure 3,, thereby also exist production firm to carry out the production and processing complicated problems of permanent magnet owing to watt shape that is shaped as of the permanent magnet 22 in the existing dc brushless motor rotor.
More crisp in view of the material of magnet, in transportation, electroplate in (coating), the installation process, be inconvenient to carry, may cause magnetic breakage, burst apart, cause the magnet breakage and the permanent magnet of watt shape structure is easier in transit.
Summary of the invention
In view of this, the rotor that the purpose of this invention is to provide a kind of brshless DC motor, can make the permanent magnet in this motor have higher surplus induction, improve the magnetic density of magnetic system, the running that has guaranteed brshless DC motor has enough torques, strengthen motor performance, fully satisfied every profession and trade user's user demand.
For this reason, the invention provides a kind of rotor of brshless DC motor, this brshless DC motor comprises stator, the rotating shaft that is positioned at the rotor of stator interior and is positioned at the rotor center position, this rotor comprises and is installed in motor stator 40 inner rotatable rotor iron cores 51, on this rotor core 51, along the circumferential direction be provided with at least two pairs at a distance of the certain intervals and the first permanent magnet 52a that radially distributes, between the end of described rotating shaft 60, be provided with the second permanent magnet 52b at adjacent two couples of permanent magnet 52a, the described first permanent magnet 52a is a ferrite permanent magnet, and the described second permanent magnet 52b is a Nd-Fe-B permanent magnet.
Preferably, the second permanent magnet 52b is a rectangle, and the long limit of the described second permanent magnet 52b is towards machine shaft 60 and distribution along the circumferential direction.
Preferably, two the first permanent magnet 52a that the described second permanent magnet 52b is adjacent constitute a magnetic pole set of the same name, and described epitrochanterian magnetic pole set of the same name is along the circumferential direction alternately arranged with the N utmost point and the S utmost point.
Preferably,, described rotor core 51 along the circumferential direction is provided with 4～8 pairs at a distance of the certain intervals and the first permanent magnet 52a that radially distributes.
By above technical scheme provided by the invention as seen, the hybrid permanent magnet type body structure that brushless DC motor rotor provided by the invention adopts neodymium iron boron and ferrite to constitute, make that the magnetic line of force of motor magnetic system is more and intensive, thereby the magnetic density of magnetic system improves and makes the running of motor have enough torques, strengthen the brshless DC motor performance, fully satisfied every profession and trade user's user demand.
In addition, the epitrochanterian permanent magnet of the present invention (the first permanent magnet 52a and the second permanent magnet 52b) all is a rectangle, therefore the epitrochanterian permanent magnet processing of the present invention is simple, the permanent magnet production and processing challenge that does not have common rotor and had, and under the more crisp situation of the material of magnet, can greatly improve the security reliability of magnet in transportation, plating (coating), installation process, reduce the magnet carrying damaged probability takes place.
Description of drawings
Fig. 1 is a kind of horizontal sectional drawing of existing brshless DC motor;
Fig. 2 is a kind of stereogram of existing brushless DC motor rotor;
Fig. 3 is the schematic diagram of looking closely of existing brushless DC motor rotor;
Fig. 4 is the motor horizontal sectional drawing with brushless DC motor rotor provided by the invention;
Fig. 5 is the schematic diagram of looking closely of brushless DC motor rotor provided by the invention;
Fig. 6 is the magnetic line of force distribution schematic diagram of existing brushless DC motor rotor shown in Figure 3;
Embodiment
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
Referring to Fig. 4, Fig. 5, Fig. 4 is the motor horizontal sectional drawing with brushless DC motor rotor provided by the invention, and Fig. 5 is the schematic diagram of looking closely of brushless DC motor rotor provided by the invention.As Fig. 4, shown in Figure 5, brshless DC motor provided by the invention comprises: be installed in the stator 40 in the motor hood (not shown), be installed in said stator 40 inside, be used to form magnetic field and with transmission of torque to outside rotor 50 and the rotating shaft 60 of inserting above-mentioned rotor 50 centres, wherein be separated with the gap between stator 40 and the rotor 50, externally during power connection said stator 40, produce electromagnetic action between rotor 50 and the stator 40, thereby rotor 50 is rotated with rotating shaft 60.
Brushless DC motor rotor 50 provided by the invention comprises: be positioned at stator 40 inner rotatable cylindrical rotor iron cores 51, on this rotor core 51, along the circumferential direction be provided with 6 pairs at a distance of the certain intervals and the first permanent magnet 52a that radially distributes, be provided with the second permanent magnet 52b at adjacent two couples of permanent magnet 52a between the end of described rotating shaft 60, the long limit of the described second permanent magnet 52b is towards rotating shaft 60 and distribution along the circumferential direction.
In the present invention, two the first permanent magnet 52a that this second permanent magnet 52b is adjacent are same magnetic pole, as all being the S utmost point or the N utmost point.
Two first permanent magnet 52a that are adjacent by one second permanent magnet 52b constitute a magnetic pole set of the same name.As shown in Figure 5, have 6 magnetic pole set of the same name on the rotor 50 provided by the invention, these magnetic pole set of the same name are along the circumferential direction alternately arranged with the N utmost point and the S utmost point.
Certainly, be understandable that, the invention is not restricted in a rotor, be provided with 6 couples first permanent magnet 52a, 6 second permanent magnet 52b and 6 magnetic pole set of the same name, can also be not less than 2 arbitrary number for other.
As Fig. 4, shown in Figure 5, the epitrochanterian permanent magnet of the present invention (the first permanent magnet 52a and the second permanent magnet 52b) all is a rectangle, therefore the epitrochanterian permanent magnet processing of the present invention is simple, the permanent magnet production and processing challenge that does not have common rotor and had, and under the more crisp situation of the material of magnet, can greatly improve the security reliability of magnet in transportation, plating (coating), installation process, reduce the magnet carrying damaged probability takes place.
In concrete practice of the present invention, consider factors such as preferable torque, be preferably on the dc brushless motor rotor of the present invention and adopt 4～8 pairs of magnetic pole set of the same name, 4～8 couples of first permanent magnet 52a, 4～8 second permanent magnet 52b.
Referring to Fig. 6, Fig. 6 is the magnetic line of force distribution schematic diagram of existing brushless DC motor rotor shown in Figure 3.Can know by this figure, adopt on the motor of existing brushless DC motor rotor, the magnetic line of force is less and more sparse, the surplus induction of permanent magnet is less, exist motor rotation to lack the problem of enough torques thereby performance deficiency, and after adopting brushless DC motor rotor provided by the invention, the magnetic line of force of motor magnetic system is more and intensive, thereby the magnetic density of magnetic system improves and makes the running of motor have enough torques, strengthen the brshless DC motor performance, fully satisfied every profession and trade user's user demand.
In the present invention, the described first permanent magnet 52a is a ferrite permanent magnet, and the described second permanent magnet 52b is a Nd-Fe-B permanent magnet.
Need to prove, Nd-Fe-B permanent magnet (NdFeB) is the strongest permanent magnet of performance in the contemporary magnet, it not only has high remanent magnetism, characteristics such as high-coercive force, high energy product, high performance price ratio, and be processed into various sizes easily, now be widely used in Aeronautics and Astronautics, electronics, electroacoustic, electromechanics, instrument, instrument, medical skill and other need equipment with the device of permanent magnetic field in, be specially adapted to develop the various regeneration products of high-performance, miniaturization, lightness.
The primary raw material of ferrite lattice comprises BaFe12O19 and SrFe12O19.Form by the ceramic process manufactured, quality is harder, belongs to fragile material, because ferrite lattice has good temperature tolerance, cheap, moderate performance, has become the permanent magnet that is most widely used.Has higher magnetic property, preferably time stability and lower temperature coefficient.Be widely used in ammeter, instrument, motor, control automatically, microwave device, radar and medicine equipment etc.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1, a kind of rotor of brshless DC motor, this brshless DC motor comprises stator, the rotating shaft that is positioned at the rotor of stator interior and is positioned at the rotor center position, it is characterized in that, this rotor comprises and is installed in the inner rotatable rotor iron core of motor stator (40) (51), on this rotor core (51), along the circumferential direction be provided with at least two pairs at a distance of certain intervals and first permanent magnet (52a) that radially distributes, between the end of described rotating shaft (60), be provided with second permanent magnet (52b) at adjacent two pairs of permanent magnets (52a), described first permanent magnet (52a) is a ferrite permanent magnet, and described second permanent magnet (52b) is a Nd-Fe-B permanent magnet.
2, brushless DC motor rotor as claimed in claim 1 is characterized in that, second permanent magnet (52b) is a rectangle, and the long limit of described second permanent magnet (52b) is towards machine shaft (60) and distribution along the circumferential direction.
3, brushless DC motor rotor as claimed in claim 1, it is characterized in that, two first permanent magnets (52a) that described second permanent magnet (52b) is adjacent constitute a magnetic pole set of the same name, and described epitrochanterian magnetic pole set of the same name is along the circumferential direction alternately arranged with the N utmost point and the S utmost point.
As any described brushless DC motor rotor in the claim 1 to 3, it is characterized in that 4, described rotor core (51) along the circumferential direction is provided with 4～8 pairs at a distance of certain intervals and first permanent magnet (52a) that radially distributes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810053991A CN101640464A (en) | 2008-07-29 | 2008-07-29 | Rotor of brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810053991A CN101640464A (en) | 2008-07-29 | 2008-07-29 | Rotor of brushless DC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101640464A true CN101640464A (en) | 2010-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810053991A Pending CN101640464A (en) | 2008-07-29 | 2008-07-29 | Rotor of brushless DC motor |
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| CN (1) | CN101640464A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956844A (en) * | 2014-05-26 | 2014-07-30 | 沈阳工业大学 | Permanent magnet synchronous generator rotor sheet for 4-pole cart |
| CN105356704A (en) * | 2015-10-22 | 2016-02-24 | 江苏大学 | U-shaped fault-tolerant permanent magnet motor made of hybrid magnetic material |
| US9906083B2 (en) | 2012-09-29 | 2018-02-27 | Emerson Electric Co. | Rotors with segmented magnet configurations and related dynamoelectric machines and compressors |
| CN109950992A (en) * | 2019-04-08 | 2019-06-28 | 哈尔滨工业大学 | Separated type combination magnetic pole hybrid permanent magnet is adjustable flux permanent magnet synchronous motor |
-
2008
- 2008-07-29 CN CN200810053991A patent/CN101640464A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9906083B2 (en) | 2012-09-29 | 2018-02-27 | Emerson Electric Co. | Rotors with segmented magnet configurations and related dynamoelectric machines and compressors |
| CN103956844A (en) * | 2014-05-26 | 2014-07-30 | 沈阳工业大学 | Permanent magnet synchronous generator rotor sheet for 4-pole cart |
| CN105356704A (en) * | 2015-10-22 | 2016-02-24 | 江苏大学 | U-shaped fault-tolerant permanent magnet motor made of hybrid magnetic material |
| CN109950992A (en) * | 2019-04-08 | 2019-06-28 | 哈尔滨工业大学 | Separated type combination magnetic pole hybrid permanent magnet is adjustable flux permanent magnet synchronous motor |
| CN109950992B (en) * | 2019-04-08 | 2021-08-13 | 哈尔滨工业大学 | Separated combined magnetic pole mixed permanent magnet adjustable flux permanent magnet synchronous motor |
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Open date: 20100203 |