CN101207315A - Rotor structure of built-in type direct current brushless motor - Google Patents
Rotor structure of built-in type direct current brushless motor Download PDFInfo
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- CN101207315A CN101207315A CNA2006101674420A CN200610167442A CN101207315A CN 101207315 A CN101207315 A CN 101207315A CN A2006101674420 A CNA2006101674420 A CN A2006101674420A CN 200610167442 A CN200610167442 A CN 200610167442A CN 101207315 A CN101207315 A CN 101207315A
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- brushless motor
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Abstract
The invention relates to a rotor structure of a built-in direct-current brushless motor, which is to arrange a groove and a convexity between the end surfaces of two adjacent magnets of the rotor, so that the rotor has a circumference with variable radius, and a variable gap is formed between the rotor and the stator, in this way, the magnetic flux of the rotor can uniformly enter into the stator so as to reduce the rotating torque, to increase the output of the magnetic-resistance torque force, to reduce the vibration noise, and to increase the integral benefit of the motor, etc.
Description
Technical field
The present invention relates to a kind of rotor structure of built-in type direct current brushless motor, be particularly related to a kind of rotor with radius unequal periphery, can constitute and not wait air gap, make rotor flux can on average enter stator, reach and reduce start and stop torque, the output of increase magnetic resistance torsion, reduction vibrating noise, promote purposes such as motor overall efficiency, be suitable for devices such as motor, motor and use and make association area.
Background technology
Motor (motor) is indispensable important device in modern industry, if the moment of torsion that can reach with regard to certain volume and material, and the keeping and the accuracy each side of usefulness, generally be comparatively desirable with built-in type direct current brushless motor, it is widely used in various electrical equipment, aspects such as transportation system, the DC frequency-changeable compressor of refrigerating and air conditioning for example, electric motor car CD-ROM drive motor or the like, with regard to DC frequency-changeable compressor, it adopts parts such as the built-in type direct current brushless motor Driven Compressor pump housing, to carry out the compression travel of refrigerant, yet, though the output of the reluctance torque of built-in magnetite motor is high than conventional surface adhesion magnetite motor, relatively, its magnetite end face forms the magnetic saturation phenomenon easily because the magnetic line of force concentrates, generally under the good situation of control, the stator field electric current should be described be directly proportional with moment of torsion, and the magnetic saturation phenomenon of right magnetite end face can cause the difficulty controlled, and precision is controlled in influence, and can produce start and stop torque, cause the vibration of motor and noise to increase.
See also the sectional structure chart of existing built-in type direct current brushless motor 10 shown in Figure 1, it comprises a rotor 11 and a stator 12, described rotor 11 is repeatedly to put institute layer by layer by a plurality of silicon steel sheets to constitute, in described rotor 11, be embedded with magnetite 13, for improving above-mentioned disappearance, traditional method is to cut in end face 131 places that described rotor 11 corresponds to described magnetite 13, make and form groove 14 between the adjacent end face 131, increase the magnetic circuit magnetic resistance by this, reduce described magnetite 13 end faces 131 and concentrate the magnetic saturation phenomenon that forms because of the magnetic line of force, No. 6525442, U.S.'s patent of invention " Permanent magnet rotating electric machine " for example, No. 6703745 " Rotorstructure for a motor having built-in type permanent magnet ", all disclose similar techniques in No. 6847144 existing patents such as " Permanentmagnet rotor assembly for interior permanent magnet electric motor ", yet according to torque equation:
Te is an electromagnetic torque;
P is the motor number of poles;
λ m is the magnetic flux chain of rotor magnet to stator;
Id is a d axle equivalent current;
Iq is a q axle equivalent current;
Ld is a d axle inductance;
Lq is a q axle inductance;
N is the motor winding coil number of turn;
Rd is a d axle magnetic resistance;
Rq is a q axle magnetic resistance;
λ mIq is a Lauren assistant moment of torsion (Lorentz Torque);
(Ld-Lq) IdIq is reluctance torque (Reluctance Torque);
When magnetite end face 131 forms groove 14,, therefore make q axle inductance L q increase, and then cause reluctance torque always to export reduction because q axle radius R q reduces; Please cooperate the magnetic flux change curve of consulting described prior art motor 10 shown in Figure 2 simultaneously, owing to be provided with groove 14 between the end face 131 of two adjacent magnetites 13, the feasible magnetic flux instantaneous variation aggravation of passing through the end face 131 of two adjacent magnetites 13, formation is trapezoidal as figure's two; Simultaneously, because the existence of described groove 14, also make the air gap of 12 of rotor 11 and stators strengthen, make and the start and stop torque increase cause noise and vibration,
Summary of the invention
Because the disappearance of prior art, the objective of the invention is to propose a kind of rotor structure of built-in type direct current brushless motor, its rotor has the periphery of radius unequal, and constitute between the stator and do not wait air gap, make rotor flux can on average enter stator by this, reach and reduce start and stop torque, the output of increase magnetic resistance torsion, reduction vibrating noise, promote purposes such as motor overall efficiency.
For achieving the above object, the present invention proposes a kind of rotor structure of built-in type direct current brushless motor, and it includes:
One rotor;
The multi-disc magnetite is to be embedded in the described rotor;
A plurality of grooves is to be arranged between the end face of described two adjacent magnetites; And
At least one protuberance is to be arranged between described a plurality of groove;
Structure by described groove and protuberance makes described rotor have the periphery of a radius unequal.
Preferably, described rotor center to the distance of described protuberance is the radius less than described rotor.
Preferably, described rotor center is to distance=(0.7～0.95) R0 (radius of described rotor) of described protuberance.
Preferably, the electrical angle of described rotor magnetite distribution is the scopes that are positioned at 80～100 degree.
Preferably, described groove and described protuberance are to be provided with at interval.
Preferably, described protuberance is the q axle setting that is symmetrical in described rotor.
Preferably, described groove is the q axle setting that is symmetrical in described rotor.
Preferably, the degree of depth of described groove is the end face that can contain described magnetite.
Further understand and approval for structure purpose of the present invention and effect are had, existing cooperate diagram to describe in detail as after.
Description of drawings
Fig. 1 is the structural representation of existing motor;
Fig. 2 is the magnetic flux change curve of existing motor;
Fig. 3 is the structural representation of preferred embodiment of the present invention;
Fig. 4 is the magnetic flux change curve of the preferable enforcement of the present invention;
Fig. 5 is the start and stop torque curve comparison sheet of the present invention and prior art;
Fig. 6 is total output torque curve comparison sheet of the present invention and prior art.
Description of reference numerals: 20-motor; The 21-rotor; The 22-stator; The 23-magnetite; 231-magnetite end face; The 24-groove; The 25-protuberance; The radius of R0-rotor; The Ri-rotor center is to the distance of protuberance.
Embodiment
For reaching the employed technology of purpose in section and effect, and following graphic cited embodiment only is an aid illustration hereinafter with reference to the graphic the present invention of description who encloses, but that the technological means of this case is not limited to is cited graphic.
See also shown in Figure 3, the structural representation of the rotor structure preferred embodiment of built-in type direct current brushless motor provided by the invention, described motor 20 is made of a rotor 21 and a stator 22, described rotor 21 is repeatedly to put institute layer by layer by a plurality of silicon steel sheets to constitute, in described rotor 21, be embedded with multi-disc magnetite 23, described motor 20 has a d axle and a q axle, as is known to the person skilled in the art, the magnetite 23 that described d axle is described rotor 21 is over against the magnetic line of force direction of the N utmost point (direct axis), that is bigger one of magnetic resistance, and described q axle is for differing the axial of 90 degree electrical angles with described d axle, therefore be called q axle (quadrature axis), that is less one of magnetic resistance, this prior art will not be given unnecessary details.
Characteristics of the present invention are, between the end face 231 of adjacent two magnetites 23, be symmetrical in described q axle and be provided with two grooves 24, between described two grooves 24, form a protuberance 25, described groove 24 is for increasing the magnetic circuit magnetic resistance, its degree of depth is the end face 231 that can contain described magnetite 23, as for the effect of described groove 24 and the effect that can reach thereof, identical with described existing structure shown in the figure one in the function of two magnetites, 13 end faces, 131 cutting flutes 14, right the present invention is by the structure setting of described groove 24 with protuberance 25, make described rotor 21 have the periphery of radius unequal, that is and described stator 22 between form and not wait air gap, again according to torque equation:
Te is an electromagnetic torque;
P is the motor number of poles;
λ m is the magnetic flux chain of rotor magnet to stator;
Id is a d axle equivalent current;
Iq is a q axle equivalent current;
Ld is a d axle inductance;
Lq is a q axle inductance;
N is the motor winding coil number of turn;
Rd is a d axle magnetic resistance;
Rq is a q axle magnetic resistance;
λ mIq is a Lauren assistant moment of torsion (Lorentz Torque);
(Ld-Lq) IdIq is reluctance torque (Reluctance Torque);
In shown in Figure 3 preferred embodiment, described d axle radius R d=R0, that is the radius of described rotor 21, and described q axle radius R q=Ri, that is described rotor 21 centers are to the distance of described protuberance 25, in view of the above, by described groove 24 and the protuberance 25 that is symmetrical in the q between centers every setting, make described rotor 21 have the periphery of radius unequal, also because the setting of described protuberance 25, make described rotor 21 can have the less periphery of a fluctuating amplitude, thereby make the magnetic flux of described rotor 21 can enter described stator 22 fifty-fifty, verify bright factually, when Ri (q axle radius)=0.7～0.95R0 (d axle radius), that is described rotor 21 centers to the distance (Ri) of described protuberance 25 is the radiuses (R0) less than described rotor 21, and the electrical angle E that distributes of described rotor 23 magnetites is 80～100 when spending, and can obtain preferable output torque.
Please cooperate simultaneously and consult Fig. 3 and magnetic flux change curve of the present invention shown in Figure 4; The periphery of the radius unequal that the structure of rotor 21 of the present invention by groove 24 and protuberance 25 constitutes, can constitute with described stator 22 and not wait air gap, therefore, it is by the magnetic flux change of the end face 231 of two adjacent magnetites 23, can keep one comparatively smooth-going, level off to the rising and the decline curve of triangular pyramid type, compared to described prior art shown in Figure 1, the present invention can reach simultaneously and reduce magnetic saturation, reduces purpose such as start and stop torque.
See also Fig. 5 again, start and stop torque curve comparison sheet for the present invention and prior art, wherein said heavy line is represented preferred embodiment structure of the present invention shown in Figure 3, described dotted line is represented described prior art configurations shown in Figure 1, can be known by comparison sheet to show that structure provided by the present invention can obtain a very mild start and stop torque change curve.
See also Fig. 6 again, total output torque curve comparison sheet for the present invention and prior art, wherein said heavy line is represented preferred embodiment structure of the present invention shown in Figure 3, described dotted line is represented described prior art configurations shown in Figure 1, can be known by comparison sheet to show that structure provided by the present invention can obtain a comparatively mild total output torque change curve.
In sum, the rotor structure of built-in type direct current brushless motor provided by the present invention, its rotor has the periphery of radius unequal, and constitute between the stator and do not wait air gap, make rotor flux can on average enter stator by this, reach and reduce start and stop torque, increase the output of magnetic resistance torsion, reduce vibrating noise, promote purposes such as motor overall efficiency, and its structure and processing mode simple, implement easily.
The above only is a most preferred embodiment of the present invention, when can not with the scope implemented of qualification the present invention.Promptly the equalization of doing according to claim of the present invention generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (8)
1. the rotor structure of a built-in type direct current brushless motor, it includes:
One rotor;
The multi-disc magnetite is to be embedded in the described rotor;
A plurality of grooves is to be arranged between the end face of described two adjacent magnetites; And
At least one protuberance is to be arranged between described a plurality of groove;
Structure by described groove and protuberance makes described rotor have the periphery of a radius unequal.
2. the rotor structure of built-in type direct current brushless motor as claimed in claim 1 is characterized in that: described rotor center to the distance of described protuberance is the radius less than described rotor.
3. the rotor structure of built-in type direct current brushless motor as claimed in claim 2 is characterized in that: described rotor center is (0.7～0.95) R0 to the distance of described protuberance, and wherein, R0 is the radius of described rotor.
4. the rotor structure of built-in type direct current brushless motor as claimed in claim 1 is characterized in that: the electrical angle that described rotor magnetite distributes is the scopes that are positioned at 80～100 degree.
5. the rotor structure of built-in type direct current brushless motor as claimed in claim 1 is characterized in that: described groove and described protuberance are to be provided with at interval.
6. the rotor structure of built-in type direct current brushless motor as claimed in claim 1, it is characterized in that: described protuberance is the q axle setting that is symmetrical in described rotor.
7. the rotor structure of built-in type direct current brushless motor as claimed in claim 1, it is characterized in that: described groove is the q axle setting that is symmetrical in described rotor.
8. the rotor structure of built-in type direct current brushless motor as claimed in claim 1, it is characterized in that: the degree of depth of described groove is an end face of containing described magnetite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101674420A CN101207315A (en) | 2006-12-20 | 2006-12-20 | Rotor structure of built-in type direct current brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101674420A CN101207315A (en) | 2006-12-20 | 2006-12-20 | Rotor structure of built-in type direct current brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101207315A true CN101207315A (en) | 2008-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101674420A Pending CN101207315A (en) | 2006-12-20 | 2006-12-20 | Rotor structure of built-in type direct current brushless motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516165A (en) * | 2013-04-09 | 2014-01-15 | 广东美芝精密制造有限公司 | Motor and compressor with motor |
| CN104348277A (en) * | 2013-08-09 | 2015-02-11 | 江西力德东元永磁发电机制造有限公司 | Permanent magnetic variable-frequency high-efficiency direct driving bio-gas generator |
-
2006
- 2006-12-20 CN CNA2006101674420A patent/CN101207315A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516165A (en) * | 2013-04-09 | 2014-01-15 | 广东美芝精密制造有限公司 | Motor and compressor with motor |
| CN104348277A (en) * | 2013-08-09 | 2015-02-11 | 江西力德东元永磁发电机制造有限公司 | Permanent magnetic variable-frequency high-efficiency direct driving bio-gas generator |
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Open date: 20080625 |