CN101588113A - Preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor - Google Patents
Preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor Download PDFInfo
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- CN101588113A CN101588113A CNA2009103018307A CN200910301830A CN101588113A CN 101588113 A CN101588113 A CN 101588113A CN A2009103018307 A CNA2009103018307 A CN A2009103018307A CN 200910301830 A CN200910301830 A CN 200910301830A CN 101588113 A CN101588113 A CN 101588113A
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Abstract
The invention discloses a preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor. The method is as follows: rotor magnetic poles of the motor use unsymmetrical large and small pole structures to reduce alveolar torque by controlling pole arc of the large and small poles. The invention uses the large and small poles and the method of setting small groove on the stator tooth, which reduces alveolar torque greatly. Because the stator of the invention still uses a straight groove and the rotor uses a straight magnetic pole, the invention is easy to process with rapid processing speed while reducing the alveolar torque greatly.
Description
Technical field
The present invention relates to a kind of manufacture method and motor of DC permanent-magnetic brushless servomotor, particularly a kind of permanent magnetic brushless servomotor with low alveolar torque.
Background technology
Because the permanent-magnet DC brushless servomotor has good controllability, and the characteristics of big starting torque, breakdown torque, directly driving of low speed, High Power Factor and high power density, use so in automation control system, have widely.
But compare with induction machine, the intrinsic deficiency of magneto is that cogging torque is bigger.Cogging torque usually becomes the fundamental cause that causes vibration, noise and raising control precision difficulty.Particularly when the cogging torque frequency is consistent with the mechanical resonance frequency of stator or rotor, vibration and noise that cogging torque produces will be exaggerated.The existence of cogging torque has influenced the low-speed performance of motor in speed control system and the hi-Fix in position control system equally.
The method that reduces cogging torque at present mainly contains following three kinds: the one, when repeatedly setting sub-punching, adopt special frock, and with certain angle that evenly staggers successively between every punching, stator slot is obliquely installed.The major defect of this method is: when repeatedly setting sub-punching, need special-purpose frock clamp and special technology, increased material cost and cost of labor; Simultaneously, because stator adopts skewed slot, giving rolls off the production line has brought very big difficulty, can't adopt automatic coil winding machine on the one hand, thereby reduces linear velocity down greatly, and the motor copper factor also is restricted on the other hand, influences the output characteristic of motor.The 2nd, rotor magnetic steel is divided into several sections vertically, certain angle that staggers between every section can reach the effect similar with skewed stator slot.The major defect of this method is: increased the installation difficulty and the positioning accuracy of magnet steel, needed special tooling device equally, increased processing and assembly cost.The 3rd: by selecting suitable number of stator slots and rotor pole logarithm, each pole center of stator tooth center and rotor is staggered mutually.The major defect of this method is: it is undesirable to eliminate the cogging torque effect, can cause the electromagnetic torque of motor to reduce bigger simultaneously.
Summary of the invention
The objective of the invention is to, a kind of method and motor that reduces permanent-magnet DC brushless servomotor alveolar torque is provided.The present invention both can weaken cogging torque greatly, have again be easy to process, characteristics that process velocity is fast.
Technical scheme of the present invention: a kind of manufacture method of permanent magnetic brushless servomotor with low alveolar torque, this method is: the rotor magnetic pole of motor adopts asymmetric large and small electrode structure, by the control to large and small utmost point polar arc, reduces the cogging torque of motor.
In the manufacture method of above-mentioned permanent magnetic brushless servomotor with low alveolar torque, described large and small electrode structure, be that rotor magnetic pole is made 8, one of them is that mechanical angle is 60 ° a big magnetic pole, and other 7 is the little magnetic pole that 300 ° of mechanical angles is divided into 7 equal portions.
In the manufacture method of aforesaid permanent magnetic brushless servomotor with low alveolar torque, be provided with sulculus at the tooth top of stator tooth.
In the manufacture method of aforesaid permanent magnetic brushless servomotor with low alveolar torque, described little well width is 1～2mm, and the degree of depth is 1～2mm.
In the manufacture method of aforesaid permanent magnetic brushless servomotor with low alveolar torque, described little well width is 1.5mm, and the degree of depth is 1.5mm.
A kind of permanent magnetic brushless servomotor with low alveolar torque comprises rotor and stator, and the formation of the rotor magnetic pole of rotor comprises one group of asymmetric large and small magnetic pole.
In the above-mentioned permanent magnetic brushless servomotor with low alveolar torque, described magnetic pole is 8, and wherein 1 is the big magnetic pole that mechanical angle equals 60 °; Other 7 is the little magnetic pole that mechanical angle equals 300/7 °.
In the aforesaid permanent magnetic brushless servomotor with low alveolar torque, described stator is provided with one group of stator slot, and the stator tooth that forms between two stator slots is provided with sulculus.
In the aforesaid permanent magnetic brushless servomotor with low alveolar torque, the width of described sulculus is 1～2mm, and the degree of depth is 1～2mm.
In the aforesaid permanent magnetic brushless servomotor with low alveolar torque, the width of described sulculus is 1.5mm, and the degree of depth is 1.5mm.
Compared with prior art, the present invention can weaken cogging torque greatly owing to adopt big or small magnetic pole and the method for sulculus is set on stator tooth.Because stator of the present invention still adopts straight trough, rotor still adopts straight magnetic pole, thus when weakening cogging torque greatly, also have be easy to process, characteristics that process velocity is fast.
For relatively the present invention and prior art are to the influence of cogging torque, the applicant has done comparative analysis with motor of the present invention and existing motor.
(a), rotor adopts even magnetic pole, stator tooth is not slotted;
(b), rotor adopts even magnetic pole, the stator tooth fluting;
(c), rotor adopts inhomogeneous (asymmetric) magnetic pole, stator tooth is not slotted;
(d), rotor adopts inhomogeneous (asymmetric) magnetic pole, the stator tooth fluting.
Key dimensions such as the axial length of four kinds of structural models, stator punching, rotor core, magnet thickness all equate.Main geometric parameters is as shown in table 1.
Table 1:
| Dimension name | Parameter value |
| Stator punching external diameter (mm) | 115 |
| Stator punching internal diameter (mm) | 61 |
| Stator punching yoke height (mm) | 8 |
| The stator punching facewidth (mm) | 5 |
| Gas length (mm) | 0.95 |
| Magnet thickness (mm) | 2.7 |
| The diameter of axle (mm) | 25 |
| Axial length (mm) | 25 |
(1) comparison stator tooth fluting is to the influence of cogging torque
From the unloaded magnetic line of force distributional analysis contrast of above-mentioned four kinds of structural models, can obtain because variation has taken place magnetic conductance, having caused the distortion of the magnetic line of force after the conclusion stator tooth fluting that this distortion can weaken the amplitude of the total cogging torque of motor.
(2) the contrast rotor magnetic pole is to the influence of cogging torque
From the result of calculation of above-mentioned four kinds of structural models, the corresponding successively from big to small above-mentioned a of the amplitude of cogging torque, b, c, four kinds of structures of d.If the cogging torque that a model is produced is defined as 1, then the cogging torque result of calculation of other three kinds of structural models generations is as shown in table 2.
Table 2
| The model sequence number | a | b | c | |
| Cogging torque | ||||
| 1 | 0.81 | 0.11 | 0.056 |
As can be seen from Table 2, under the situation that stator tooth is not slotted, the cogging torque that rotor adopts inhomogeneous field structure to produce reduces greatly than the cogging torque that even magnetic pole produces.If after stator tooth takes the fluting measure, can further reduce this cogging torque, the cogging torque of stator tooth fluting, the inhomogeneous model of rotor magnetic pole than stator tooth do not slot, the cogging torque of rotor magnetic pole homogeneous model reduces by 20 times nearly.
(3) four kinds of different structures are to the influence of electromagnetic torque
From the result of calculation of above-mentioned four kinds of structures in the logical identical currents of motor windings, the corresponding successively from big to small above-mentioned a of the amplitude of electromagnetic torque, b, c, four kinds of structures of d.Comparative analysis is as shown in table 3.
Table 3:
| The model sequence number | a | b | c | d |
| Breakdown torque (Nm) | 2.51 | 2.44 | 2.04 | 1.95 |
| Pull up torque (Nm) | 1.63 | 1.70 | 1.95 | 1.89 |
| Average torque (Nm) | 2.07 | 2.05 | 1.99 | 1.92 |
| Torque pulsation (%) | 21.2 | 17.9 | 2.3 | 1.6 |
| Torque pulsation reduced rate (%) | 0 | 15.6 | 89.2 | 92.5 |
| Average torque loss late (%) | 0 | 1.0 | 3.9 | 7.2 |
Result of calculation from table 3 as can be seen, stator tooth fluting of the present invention, rotor adopt under the situation of big or small electrode structure, torque pulsation can reduce by 92.5% than the situation that stator tooth is not slotted, rotor adopts even magnetic pole, torque pulsation can be controlled in below 2%, can satisfy servo-drive generally speaking fully, can have the characteristics of low pulsation, low noise and low vibration.Simultaneously, motor average torque loss only 7.2%, big extra consumption that can not cause the effective material of motor.In addition, the key factor that motor torque ripple is reduced is the control of rotor magnetic pole size utmost point polar arc, torque pulsation is being required under the uncomfortable extra high situation, and stator tooth can be slotted, only rotor adopts big or small electrode structure, and motor average torque loss late can further reduce like this.
By above contrast, rotor magnetic pole adopts asymmetric big or small electrode structure, by the control to big or small utmost point polar arc, does not adopt skewed slot, rotor not to adopt under the situation of the oblique utmost point at stator, can reduce the cogging torque and the electromagnetic torque pulsation of motor greatly.
No matter which kind of structure motor adopts, and final purpose is the load characteristic that needs in order to obtain.Under a lot of situations, when weakening cogging torque by certain measure, the power out-put characteristic of reduction motor that also can be bigger often.In order to guarantee the power output of motor, often compensate at present by increasing modes such as motor volume.And the innovation effect that the present invention can reach is under the situation that does not increase motor volume, both can weaken cogging torque greatly, have again be easy to process, characteristics that process velocity is fast.Make motor that outstanding the improvement be arranged aspect following two:
1) can weaken cogging torque greatly, decrease by more than 90%, the electromagnetic torque pulsation range of decrease also can reach more than 90% simultaneously, can satisfy the control requirement of common DC permanent-magnetic brushless servomotor;
2) stator need not skewed slot, rotor need not the oblique utmost point, stator core repeatedly adorn technology and rotor magnetic steel processing and assembly technology all cost-saved over half.And, can raise the efficiency tens times than manually rolling off the production line because the stator straight trough can adopt automatic coil winding machine to roll off the production line, and significant in production in enormous quantities, can produce very big economic benefit.
The motor of the present invention's development can have good servo characteristic directly as the door motor use of opening the door/close of automation door, and vibration and noise are all very low.Can enhance productivity greatly after adopting this technology, reduce material and production cost, have good practical value.
In addition, this technology is further expanded, can be formed seriation, mass product, can be applicable to the automatically-controlled door of occasions such as hotel, supermarket, and many occasions such as electric rolling door, automotive seat adjustment.In above-mentioned application and the mechanical industry of control, huge market potential will be formed.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that the A of Fig. 1 is to view.
Being labeled as in the accompanying drawing: 1-rotor, 2-stator, the big magnetic pole of 3-, the little magnetic pole of 4-, 5-stator chip, 6-stator slot, 7-stator tooth, 8-sulculus.
Embodiment
Be described in further detail below in conjunction with the manufacture method and the motor of drawings and Examples a kind of permanent magnetic brushless servomotor with low alveolar torque of the present invention, but not as the foundation of the present invention being done any restriction.
Embodiment.The manufacture method of permanent magnetic brushless servomotor with low alveolar torque of the present invention as shown in Figure 1.This method is: the rotor magnetic pole of motor adopts the large and small electrode structure of asymmetric (inhomogeneous), by the control to large and small utmost point polar arc, reduces the cogging torque of motor.Described large and small electrode structure is that rotor magnetic pole is made 8, and one of them is that mechanical angle is 60 ° a big magnetic pole, and other 7 is the little magnetic pole that 300 ° of mechanical angles is divided into 7 equal portions.Tooth top at the motor stator tooth is provided with sulculus.Little well width is 1～2mm, and the degree of depth is 1～2mm.Little well width is 1.5mm, and the degree of depth is that 1.5mm is better.
Control to large and small utmost point polar arc is that rotor adopts asymmetric 8 magnetic poles of size, and one of them magnetic pole is the big utmost point, and other 7 pole dimension are identical, are the little utmost point.If 8 magnetic poles adopt uniform scheme, i.e. 45 ° of mechanical angles of the central angle that each utmost point should corresponding 3 tooth pitches then.The central angle of big extremely corresponding 4 tooth pitches, i.e. 60 ° of mechanical angles in the present embodiment.
A kind of permanent magnetic brushless servomotor with low alveolar torque comprises rotor 1 and stator 2, and the formation of the rotor magnetic pole of rotor 1 comprises one group of asymmetric large and small magnetic pole.Described magnetic pole is 8, and wherein 1 is the big magnetic pole 3 that mechanical angle equals 60 °; Other 7 is the little magnetic pole 4 that mechanical angle equals 300/7 °.The stator chip 5 that constitutes stator 2 is provided with the stator tooth 7 that forms between 6, two stator slots 6 of one group of stator slot and is provided with sulculus 8.Little well width is 1～2mm, and the degree of depth is 1～2mm.Little well width is 1.5mm, and the degree of depth is that 1.5mm is better.
Claims (10)
1. the manufacture method of a permanent magnetic brushless servomotor with low alveolar torque is characterized in that: adopt asymmetric large and small electrode structure by rotor magnetic pole, reduce the cogging torque of motor.
2. the manufacture method of permanent magnetic brushless servomotor with low alveolar torque according to claim 1, it is characterized in that: described large and small electrode structure, be that rotor magnetic pole is made 8, one of them is that mechanical angle is 60 ° a big magnetic pole, and other 7 is the little magnetic pole that 300 ° of mechanical angles is divided into 7 equal portions.
3. the manufacture method of permanent magnetic brushless servomotor with low alveolar torque according to claim 1 and 2, it is characterized in that: the tooth top at stator tooth is provided with sulculus.
4. the manufacture method of permanent magnetic brushless servomotor with low alveolar torque according to claim 3, it is characterized in that: described little well width is 1～2mm, the degree of depth is 1～2mm.
5. the manufacture method of permanent magnetic brushless servomotor with low alveolar torque according to claim 4, it is characterized in that: described little well width is 1.5mm, the degree of depth is 1.5mm.
6. a permanent magnetic brushless servomotor with low alveolar torque comprises rotor (1) and stator (2), it is characterized in that: the formation of the rotor magnetic pole of rotor (1) comprises one group of asymmetric large and small magnetic pole.
7. permanent magnetic brushless servomotor with low alveolar torque according to claim 6 is characterized in that: described magnetic pole is 8, and wherein 1 is the big magnetic pole (3) that mechanical angle equals 60 °; Other 7 is the little magnetic pole (4) that mechanical angle equals 300/7 °.
8. permanent magnetic brushless servomotor with low alveolar torque according to claim 6 is characterized in that: described stator (2) is provided with one group of stator slot (6), and the stator tooth (7) that forms between two stator slots (6) is provided with sulculus (8).
9. permanent magnetic brushless servomotor with low alveolar torque according to claim 8 is characterized in that: the width of described sulculus (8) is 1～2mm, and the degree of depth is 1～2mm.
10. permanent magnetic brushless servomotor with low alveolar torque according to claim 9 is characterized in that: the width of described sulculus (8) is 1.5mm, and the degree of depth is 1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009103018307A CN101588113A (en) | 2008-12-30 | 2009-04-24 | Preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810306636.3 | 2008-12-30 | ||
| CN200810306636 | 2008-12-30 | ||
| CNA2009103018307A CN101588113A (en) | 2008-12-30 | 2009-04-24 | Preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor |
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| Publication Number | Publication Date |
|---|---|
| CN101588113A true CN101588113A (en) | 2009-11-25 |
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| CNA2009103018307A Pending CN101588113A (en) | 2008-12-30 | 2009-04-24 | Preparation method of a permanent magnetic brushless servomotor with low alveolar torque and a motor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185447A (en) * | 2011-05-09 | 2011-09-14 | 佛山市顺德区泛仕达机电有限公司 | Novel inner rotor permanent magnet motor |
| CN102324827A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Brushless direct current motor |
| CN102931743A (en) * | 2012-11-16 | 2013-02-13 | 无锡先锋电机有限公司 | Permanent magnet motor capable of eliminating cogging torque |
| CN103904793A (en) * | 2014-03-28 | 2014-07-02 | 湖北立锐机电有限公司 | Integrated motor stator punching sheet, motor stator and rotating motor using integrated motor stator punching sheet |
| CN106787287A (en) * | 2016-11-24 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor cogging torque optimization method, electric machine structure and motor |
| CN109831085A (en) * | 2019-02-15 | 2019-05-31 | 深圳市配天电机技术有限公司 | Switched reluctance machines, electric car and electrical equipment |
| WO2020253184A1 (en) * | 2019-06-17 | 2020-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Stator, motor and compressor |
| EP4329152A1 (en) * | 2022-08-22 | 2024-02-28 | Sanyo Denki Co., Ltd. | Rotor |
-
2009
- 2009-04-24 CN CNA2009103018307A patent/CN101588113A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185447A (en) * | 2011-05-09 | 2011-09-14 | 佛山市顺德区泛仕达机电有限公司 | Novel inner rotor permanent magnet motor |
| CN102185447B (en) * | 2011-05-09 | 2012-11-21 | 佛山市顺德区泛仕达机电有限公司 | Novel inner rotor permanent magnet motor |
| CN102324827A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Brushless direct current motor |
| CN102931743A (en) * | 2012-11-16 | 2013-02-13 | 无锡先锋电机有限公司 | Permanent magnet motor capable of eliminating cogging torque |
| CN103904793A (en) * | 2014-03-28 | 2014-07-02 | 湖北立锐机电有限公司 | Integrated motor stator punching sheet, motor stator and rotating motor using integrated motor stator punching sheet |
| CN106787287A (en) * | 2016-11-24 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor cogging torque optimization method, electric machine structure and motor |
| CN106787287B (en) * | 2016-11-24 | 2023-06-30 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor cogging torque optimization method, motor structure and motor |
| CN109831085A (en) * | 2019-02-15 | 2019-05-31 | 深圳市配天电机技术有限公司 | Switched reluctance machines, electric car and electrical equipment |
| WO2020253184A1 (en) * | 2019-06-17 | 2020-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Stator, motor and compressor |
| EP4329152A1 (en) * | 2022-08-22 | 2024-02-28 | Sanyo Denki Co., Ltd. | Rotor |
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Application publication date: 20091125 |