CN103956838A - Stator used in brushless direct current motor and used for reducing fundamental wave cogging torque - Google Patents
Stator used in brushless direct current motor and used for reducing fundamental wave cogging torque Download PDFInfo
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- CN103956838A CN103956838A CN201410213525.3A CN201410213525A CN103956838A CN 103956838 A CN103956838 A CN 103956838A CN 201410213525 A CN201410213525 A CN 201410213525A CN 103956838 A CN103956838 A CN 103956838A
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Abstract
The invention relates to the technical field of motors, in particular to a stator used in a brushless direct current motor and used for reducing fundamental wave cogging torque. The stator is provided with a stator iron core formed by overlaying a plurality of pieces of stamped silicon steel. A winding is arranged on the iron core, a center hole is formed in the stator iron core, and a plurality of crown structures are arranged around the center hole. The stator is characterized in that at least one axial groove is formed in the arc end face of each crown. According to the stator used in the brushless direct current motor and used for reducing the fundamental wave cogging torque, the fundamental wave cogging torque is effectively reduced, the motor power is improved, the motor is convenient to start, and low in vibration and noise, and the stator is mainly applicable to the improvement of the brushless direct current motor.
Description
Technical field
The present invention relates to technical field of motors, especially a kind of stator that reduces first-harmonic cogging torque for brshless DC motor.
Background technology
World never stopped the research of brshless DC motor, the Scientific Research Achievements of brshless DC motor also constantly presents, the multiple formula of putting of its structure, but up to now, it is the problem that reluctance torque is larger that DC brushless motor still exists first-harmonic cogging torque, and this problem has directly had influence on the startability of motor, energy consumption, vibration noise, the series of problems such as control signal sensing distortion.
Summary of the invention
Object of the present invention is exactly will solve existing brshless DC motor to have larger the brought series of problems of first-harmonic cogging torque, and a kind of stator that reduces first-harmonic cogging torque for brshless DC motor is provided.
Concrete scheme of the present invention is: the stator for existing brshless DC motor improves, it has the stator core being formed by stacking by polylith silicon steel punching, on stator core, be provided with winding, in stator core, be also provided with centre bore, be provided with some crown structures around centre bore, it is characterized in that: on the circular arc end face of each crown, have at least 1 axial notch.
The groove that described in the present invention, stator iron core tooth is labeled is 1-2 bar.
The groove that described in the present invention, stator iron core tooth is labeled is that rib is established, one end communicating structure in structure or one end that rib is established at the groove that connects of total length or two ends.
The groove that described in the present invention, stator iron core tooth is labeled is rectangle or semicircle.
The invention has the beneficial effects as follows: because DC. brushless electric machine stator number of poles is far below determining frequency motor stator number of poles, DC brushless motor need to adopt electronics commutation, thereby the fixed frequency motor vibrating that is in operation is bigger, also increases electronically controlled difficulty simultaneously.Stator of the present invention increases after groove in tooth crown, DC. brushless electric machine stator crown is taking notch center line as zero point, when magnetic pole midline is at dead-center position, the reluctance torque that they produce is zero, in the time that rotor is removed, when magnetic pole midline shift dead-center position, because having produced reluctance torque, magnetic resistance change rate tries hard to rotor to retract equilbrium position.The groove structure of the present invention after by appropriate design effectively reduces more than 20% reluctance torque, thereby improved the reliability of brshless DC motor, make motor be easier to control, and it is large to have solved electric motor starting electric current, a difficult problem for motor oscillating and noise.
Brief description of the drawings
Fig. 1 is the perspective view of stator core construction one of the present invention;
Fig. 2 is the front view of stator core construction one of the present invention;
Fig. 3 is the perspective view of stator core construction two of the present invention.
In figure: 1-stator core, 2-crown, 3-centre bore, 4-groove.
Embodiment
Example 1: one of structure of the present invention, referring to Fig. 1,2, it has the stator core 1 being formed by stacking by polylith silicon steel punching, which is provided with winding and (in figure, do not provide winding, belong to routine techniques), in stator core, be also provided with centre bore 3, be provided with 6 crowns 2 around centre bore, particularly: on the circular arc end face of each crown 2, have 2 axial notches 4, mainly being applicable to unit number of slots ZO is strange motor (can also offer 1 axial notch, to be applicable to the motor of unit number of slots ZO as even number).
The groove that groove 4 on the crown of stator core described in the present embodiment 2 connects for total length.
Groove 4 on the crown of stator core described in the present embodiment 2 is rectangular configuration.
Example 2: two of structure of the present invention, referring to Fig. 3, it has the stator core 1 being formed by stacking by polylith silicon steel punching, which is provided with winding and (in figure, do not provide winding, belong to routine techniques), in stator core, be provided with centre bore 3, be provided with some crown 2 structures around centre bore, particularly: on the circular arc end face of each crown 2, have 2 axial notches 4.
Groove 4 two ends on the crown of stator core described in the present embodiment 2 are provided with rib (can also establish rib in an one end, the other end connects).
Groove 4 on the crown of stator core described in the present embodiment 2 is semicircle.
Design principle of the present invention is analyzed as follows: stator crown is offered the brshless DC motor of groove, adopts stator silicon steel punching crown to offer auxiliary flute.First consider that groove is counted Z and number of poles 2p combines and the relation of cogging torque.It has been generally acknowledged that, first-harmonic cogging torque periodicity is larger, and its amplitude is just less.So should select number of stator slots Z and rotor number of poles 2p combination that least common multiple (LCM) is larger.Select the evaluation factor of number of stator slots Z and number of poles 2p combination.And think that the evaluation factor is less, the peak value of cogging torque is lower.Obviously on numerical value, be exactly the greatest common divisor Nm that groove is counted Z and number of poles 2p, N is natural number, and m is the number of phases.The definition of counting q by every extremely every phase groove, has Z/2p=mq, and m=3 here can obtain respectively the evaluation factor expression of three-phase brushless motor integer groove winding and fractional slot winding:
1, for integer groove winding electric machine, q is integer, and mq must be integer, thereupon, and the least common multiple NC=Z of Z and 2p, greatest common divisor Nm=2p, NP=2p/Nm=1.Like this, the evaluation factor expression of integer groove winding electric machine is CT=2p.
2, for fractional slot winding motor, q is mark, and establishing q=c/d can not reduce, and has Z/2p=Z0/2p0=mc/d, and in formula, Z0 and 2p0 are number of stator slots and the rotor numbers of poles of corresponding unit motor.One of constraints of fractional slot winding unit number of slots and number of poles combination is the multiple that its number of poles does not allow to be chosen as number of phases m, so d can not equal m or the multiple of m.Be that mc/d is still irreducible fraction.If the greatest common divisor of Z and 2p is Nm, there are Z=Nm × mc and 2p=Nm × d, obtain greatest common divisor Nm=2p/d.
Same groove is counted the fractional slot winding motor of Z compared with integer groove winding electric machine, and first-harmonic cogging torque periodicity increases d doubly; The fractional slot winding motor of identical number of poles 2p is compared with integer groove winding electric machine, and the evaluation factor CT of first-harmonic cogging torque has reduced d doubly.More than analyze and absolutely prove that employing fractional slot winding motor is conducive to reduce first-harmonic cogging torque.
Stator crown is offered groove winding brushless DC motor stator electrical steel sheet crown and is offered auxiliary flute.In order to reduce first-harmonic cogging torque, offering auxiliary flute at stator core crown is simply a kind of and effective method.Conventionally be limited to crown space, the groove number of offering is selected in 1 or 2, and individual cases also have gets more groove numbers.Groove can, apart from shape, also have semicircular.The principle of offering auxiliary flute reduction first-harmonic cogging torque is to be equivalent to increase cogging torque primitive period number, and the first-harmonic cogging torque that auxiliary flute is new plays setoff effect to the first-harmonic cogging torque of original notch, thereby total first-harmonic cogging torque amplitude is reduced.Crown is offered auxiliary flute also makes effective air gap increase, and is also conducive to reduce first-harmonic cogging torque.This method is usually used in groove number or the less motor of number of poles.When employing, should notice preventing that crown from occurring local magnetic saturation because offering auxiliary flute.As previously mentioned, average first-harmonic cogging torque periodicity under a slot pitch is Np, and auxiliary flute is counted Nn should avoid getting Nn+1=KNp, or Nn+1=Np/K, K=1,2,3 ...Otherwise cogging torque may increase on the contrary because offering auxiliary flute.Analyze the available auxiliary flute of different slots number of poles combination and count Nn, fractional slot winding motor.Analyzing as front, is irreducible fraction by q=c/d, Np=2p/Nm=d, Nc=2pZ/Nm=dZ.Analyze the less and conventional slot number of several Z and p and count combined situation, it is the motor of odd number (d is even number) for unit number of slots Z0, it is 2 that minimum available auxiliary flute is counted Nn, and unit number of slots Z0 is the motor of even number (d is odd number), it is 1 that minimum available auxiliary concave groove is counted Nn.In described direct current drive machine stator silicon steel breath, be equipped with multi cord circle winding stator silicon steel sheet crown and offer auxiliary flute composition DC motor field frame assembly.In described DC motor rotor silicon steel sheet, be equipped with many group N sheet magnetic links composition DC motor rotor assemblies.Described brushless DC motor is to be combined into a high-performance motor by field frame assembly and rotor assembly.
Groove in the present invention, taking apart from shape, semicircle as optimum structure, can also be other geometry certainly, and the groove of offering is counted Nn and selected in 1 or 2, offers groove reduction cogging torque and plays setoff effect.Principle is equivalent to increase cogging torque primitive period number, thereby total cogging torque amplitude is reduced.Crown is offered auxiliary flute also makes effective air gap increase, and is also conducive to reduce first-harmonic cogging torque, and this method is mainly applicable to groove number or the less brshless DC motor of number of poles.
Because teeth groove and the rotor permanent magnet interaction of electric machine iron core produce reluctance torque.Adopt rotor silicon steel punching crown to offer groove technology, effectively reduce cogging torque, reduce starting current motor oscillating and noise.Effectively reduce first-harmonic cogging torque.
Claims (5)
1. one kind is reduced the stator of first-harmonic cogging torque for brshless DC motor, there is the stator core being formed by stacking by polylith silicon steel punching, stator core is provided with winding, in stator core, be also provided with centre bore, be provided with some crown structures around centre bore, it is characterized in that: on the circular arc end face of each crown, have at least 1 axial notch.
2. a kind of stator that reduces first-harmonic cogging torque for brshless DC motor according to claim 1, is characterized in that: the groove that described stator iron core tooth is labeled is 1-2 bar.
3. a kind of stator that reduces first-harmonic cogging torque for brshless DC motor according to claim 1 and 2, it is characterized in that: the groove that described stator iron core tooth is labeled is the groove of total length perforation or the structure that rib is established at two ends, or rib is established, one end communicating structure in one end.
4. a kind of stator that reduces first-harmonic cogging torque for brshless DC motor according to claim 1 and 2, is characterized in that: the groove that described stator iron core tooth is labeled is rectangle or semicircle.
5. according to claim 3 a kind of for the dynamo-electric stator that reduces first-harmonic cogging torque of brushless dc, it is characterized in that: the groove that described stator iron core tooth is labeled is rectangle or semicircle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410213525.3A CN103956838A (en) | 2014-05-21 | 2014-05-21 | Stator used in brushless direct current motor and used for reducing fundamental wave cogging torque |
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| CN201410213525.3A CN103956838A (en) | 2014-05-21 | 2014-05-21 | Stator used in brushless direct current motor and used for reducing fundamental wave cogging torque |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795914A (en) * | 2015-05-12 | 2015-07-22 | 山东大学 | Rotor tooth number selection method for low-cogging-torque asynchronous-starting permanent-magnet synchronous motor |
| CN105680587A (en) * | 2016-04-06 | 2016-06-15 | 苏州市润豪电机有限公司 | Brushless dust collector motor noise-reduction device |
| WO2016173107A1 (en) * | 2015-04-30 | 2016-11-03 | 苏州腾龙电机科技有限公司 | Direct current brushless motor having embedded magnets |
| CN108365724A (en) * | 2018-05-16 | 2018-08-03 | 湖州越球电机有限公司 | Refrigerator permanent-magnet brushless DC electric machine |
| CN109643915A (en) * | 2016-09-05 | 2019-04-16 | Lg伊诺特有限公司 | Stator and motor including stator |
| CN112448496A (en) * | 2020-12-03 | 2021-03-05 | 江苏苏美达五金工具有限公司 | Stator punching sheet and low-cogging-torque permanent magnet brushless motor with same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810965A (en) * | 2012-07-19 | 2012-12-05 | 春城控股集团有限公司 | Brushless permanent magnet direct current motor with windings on sunken skewed slots reserved on crowns of stator and rotor |
| CN203339818U (en) * | 2013-04-27 | 2013-12-11 | 广东工业大学 | Stator/rotor structure of permanent magnet brushless direct current motor |
| JP2014018029A (en) * | 2012-07-11 | 2014-01-30 | Jtekt Corp | Manufacturing method of rotary electric machine and rotary electric machine |
| CN203813542U (en) * | 2014-05-21 | 2014-09-03 | 黄石东贝电器股份有限公司 | Stator capable of reducing fundamental wave cogging torque used for brushless direct current motor |
-
2014
- 2014-05-21 CN CN201410213525.3A patent/CN103956838A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014018029A (en) * | 2012-07-11 | 2014-01-30 | Jtekt Corp | Manufacturing method of rotary electric machine and rotary electric machine |
| CN102810965A (en) * | 2012-07-19 | 2012-12-05 | 春城控股集团有限公司 | Brushless permanent magnet direct current motor with windings on sunken skewed slots reserved on crowns of stator and rotor |
| CN203339818U (en) * | 2013-04-27 | 2013-12-11 | 广东工业大学 | Stator/rotor structure of permanent magnet brushless direct current motor |
| CN203813542U (en) * | 2014-05-21 | 2014-09-03 | 黄石东贝电器股份有限公司 | Stator capable of reducing fundamental wave cogging torque used for brushless direct current motor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016173107A1 (en) * | 2015-04-30 | 2016-11-03 | 苏州腾龙电机科技有限公司 | Direct current brushless motor having embedded magnets |
| CN104795914A (en) * | 2015-05-12 | 2015-07-22 | 山东大学 | Rotor tooth number selection method for low-cogging-torque asynchronous-starting permanent-magnet synchronous motor |
| CN105680587A (en) * | 2016-04-06 | 2016-06-15 | 苏州市润豪电机有限公司 | Brushless dust collector motor noise-reduction device |
| CN109643915A (en) * | 2016-09-05 | 2019-04-16 | Lg伊诺特有限公司 | Stator and motor including stator |
| CN108365724A (en) * | 2018-05-16 | 2018-08-03 | 湖州越球电机有限公司 | Refrigerator permanent-magnet brushless DC electric machine |
| CN112448496A (en) * | 2020-12-03 | 2021-03-05 | 江苏苏美达五金工具有限公司 | Stator punching sheet and low-cogging-torque permanent magnet brushless motor with same |
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Application publication date: 20140730 |