CN105281523A - Brushless motor - Google Patents
Brushless motor Download PDFInfo
- Publication number
- CN105281523A CN105281523A CN201510319314.2A CN201510319314A CN105281523A CN 105281523 A CN105281523 A CN 105281523A CN 201510319314 A CN201510319314 A CN 201510319314A CN 105281523 A CN105281523 A CN 105281523A
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- Prior art keywords
- tooth
- stator
- brushless electric
- electric machine
- rotor
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Classifications
-
- 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
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/182—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to stators axially facing the rotor, i.e. with axial or conical air gap
-
- 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
- H02K1/2793—Rotors axially facing stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
A brushless motor in which a stator and a rotor are arranged relative to one another in a direction of a rotational axis is provided. The rotor may include a plurality of annularly arranged permanent magnets which are N-poles and S-poles that alternate with each other about the rotational axis of the rotor. The stator may include first teeth annularly arranged and facing the plurality of permanent magnets in the direction of the rotational axis, and a plurality of coils corresponding to the first teeth.
Description
Technical field
The disclosure generally relates to the brushless electric machine with stator.
Background technology
Motor utilizes the electric current of the conductor be applied in magnetic field and converts electric energy to mechanical energy, to produce power.Various types of motor is applied to whole industry.Particularly, brushless electric machine is widely used, and it comprises stator core and winding around by providing permanent magnet on rotor in the stator without the need to brush and commutator.
Demand is existed to the brushless electric machine that can be applicable to have wherein parts and be arranged the drive system of structure in the direction of the axis of rotation, the lens of such as imaging device or the lens barrel of mounted lens on it.Expect to provide and allow this drive system little dimensionally and there is the high design of electrical motor exported.
Summary of the invention
Illustrative embodiment disclosed herein comprises can the brushless electric machine of the structure of drive arrangement on the direction of rotation.This brushless electric machine can produce high moment of torsion with low speed rotation.
According to one side of the present disclosure, a kind of brushless electric machine comprises: rotor, comprises multiple permanent magnet arranged annularly, and the plurality of permanent magnet is the rotation of rotor N pole alternating with each other and S pole; Stator, comprises and to arrange annularly and to the first tooth of described multiple permanent magnet and correspond to multiple coils of the first tooth on the direction of rotation.The number Z of the magnetic dipole of described multiple permanent magnet
2, the first tooth number Z
1with the relation between the number P of the magnetic dipole of stator can be expressed as Z
2=Z
1± P.
Rotor can also comprise and has hollow interior and the rotor core supporting described multiple permanent magnet.
Stator can also comprise and has hollow interior and the first stator core supporting the first tooth.
Described multiple coil can be wound around around the first tooth.
First tooth can in the circular path of rotation with equal interval separated from one another arrange, and multiple first slit can be formed between the first tooth.Described multiple coil can be wound around around the first stator core and make described multiple coil correspond to described multiple first slit.
Brushless electric machine can also comprise the second tooth, and this second tooth is connected respectively to the part of the first tooth and is arranged as on the direction of rotation described multiple permanent magnet.Each second tooth can be greater than the width in the radial direction of each first tooth at stator at the width in the radial direction of stator.
This brushless electric machine can also comprise and has hollow shape, to be plugged between the first tooth and the second tooth and the second stator core that the second tooth is connected to each other.
Each second tooth can be equal to or greater than width sum each in width in the radial direction and the described multiple coil be wound around around the first tooth of each first tooth at stator at the width in the radial direction of stator.
According to one side of the present disclosure, a kind of brushless electric machine comprises: rotor, comprises multiple permanent magnet, and the plurality of permanent magnet is the rotation of rotor N pole alternating with each other annularly and S pole; And stator, wherein stator comprises: arrange annularly and each the first tooth extended on the direction of rotation; Multiple coil, corresponding to the first tooth; Multiple connecting elements, extends from the first tooth respectively in a circumferential direction; And the 3rd tooth, be arranged on described multiple connecting elements and make the 3rd tooth on the direction of rotation to described multiple permanent magnet.
When the number of the magnetic dipole of described multiple permanent magnet is P
r, the 3rd tooth the number of dipole be N
sand the number of the dipole of the first tooth is P
stime, brushless electric machine can be expressed as P
r=N
s-P
s.
Brushless electric machine can also comprise and has hollow shape and the rotor core supporting described multiple permanent magnet.
Described multiple coil can be wound around around the first tooth.
Brushless electric machine can also comprise and has hollow shape and the first stator core supporting the first tooth.
First tooth can in the circular path of rotation with equal interval separated from one another arrange, and multiple first slit can be formed between the first tooth.
3rd tooth can in described circular path with equal interval separated from one another arrange, and multiple second slit can be formed between the 3rd tooth.
Each 3rd tooth can be greater than the width in the radial direction of each first tooth at stator at the width in the radial direction of stator.
Brushless electric machine can also comprise and has hollow shape and make described multiple connecting elements be connected to the second stator core each other.
Each 3rd tooth can be equal to or greater than the width in the radial direction of each first tooth at stator and the width sum of each coil in the described multiple coil be wound around around the first tooth at the width in the radial direction of stator.
Accompanying drawing explanation
From below in conjunction with the description of accompanying drawing to embodiment, these and/or other side will become obvious and be easier to understand, in accompanying drawing:
Fig. 1 is the decomposition diagram of the brushless electric machine according to embodiment of the present disclosure;
Fig. 2 is the perspective view of the example that the rotor comprised at the brushless electric machine of Fig. 1 is shown;
Fig. 3 is the perspective view of the example that the stator comprised at the brushless electric machine of Fig. 1 is shown;
Fig. 4 A is the perspective view of the brushless electric machine according to embodiment of the present disclosure, and wherein the first tooth is arranged on stator core;
Fig. 4 B is the end view of the brushless electric machine of Fig. 4 A;
Fig. 4 C is the perspective view of the brushless electric machine according to another embodiment of the present disclosure, and its coil is wound around around this brushless electric machine;
Fig. 5 is the plane graph of rotor according to the brushless electric machine of embodiment of the present disclosure and stator;
Fig. 6 A is the decomposition diagram passing through the brushless electric machine of the stator acquisition of the brushless electric machine changing Fig. 1 according to embodiment of the present disclosure;
Fig. 6 B is the perspective view after the assembling of the brushless electric machine of Fig. 6 A;
Fig. 6 C is the fragmentary, perspective view of the brushless electric machine of Fig. 6 A;
Fig. 7 A is the perspective view arranging the stator of the first tooth and the 3rd tooth wherein of the brushless electric machine according to another embodiment of the present disclosure;
Fig. 7 B is the perspective view after the assembling of the brushless electric machine of Fig. 7 A;
Fig. 7 C is the rotor of the brushless electric machine of Fig. 7 B and the plane graph of stator;
Fig. 8 A is the decomposition diagram passing through the brushless electric machine of the stator acquisition of the brushless electric machine changing Fig. 1 according to another embodiment of the present disclosure;
Fig. 8 B is the perspective view after the assembling of the brushless electric machine of Fig. 8 A;
Fig. 8 C is the fragmentary, perspective view of the brushless electric machine of Fig. 8 A;
Fig. 9 A is the perspective view arranging the first tooth and the 3rd tooth stator wherein of the brushless electric machine according to another embodiment of the present disclosure;
Fig. 9 B is the fragmentary, perspective view of the brushless electric machine of Fig. 9 A; And
Fig. 9 C is the rotor of the brushless electric machine of Fig. 9 B and the plane graph of stator.
Embodiment
More fully describe the present invention's design now with reference to accompanying drawing, the one exemplary embodiment of the present invention's design is shown in the drawings.Reference numeral identical in accompanying drawing represents identical element, and its description can be omitted.
Fig. 1 is the decomposition diagram of the brushless electric machine 10 according to illustrative embodiment.The rotor 100 that brushless electric machine 10 comprises stator 200 and rotates relative to stator 200.Stator 200 and rotor 100 can eachly be annular.Stator 200 comprise flat (flat) annular with hollow interior the first stator core 210 and each extend on the direction of rotation Z and in the circular path of the first stator core 210 (that is, annularly) first tooth (to be hereinafter also referred to as the first stator tooth) 220 of arranging.Coil 230 can be wound around around the first tooth 220 respectively.Rotor 100 comprises rotor core 110 and permanent magnet 150.
Temporarily with reference to Fig. 4 B, when motor 10 is assembled, rotor 100 can be spaced apart with the lowest surface of the first tooth 220.That is, rotor 100 one end 221 of each first tooth 220 that can be comprised with stator 200 by air gap 400 is spaced apart.
Fig. 2 is the perspective view of an example of rotor 100.Jointly see figures.1.and.2, rotor 100 comprises rotor core 110 and has the permanent magnet 150 of the arctic (N) and the South Pole (S) replaced annularly.Rotor core 110 can have hollow ring structure.Rotor core 110 can be the lamination of the multiple thin plate (such as the iron plate of annular) formed on the direction of rotation Z by such as ferromagnetic material or permeability magnetic material.
Permanent magnet 150 can be arranged in rotor core 110 with equal interval with on the surface (upper surface in accompanying drawing) faced by the first tooth 220 of stator 200.Permanent magnet 150 is in the N pole circumferentially alternating with each other of rotor core 110 and S pole.Permanent magnet 150 can be arranged on rotor core 110 by any one in various method.The method be applicable to includes but not limited to form surface permanent magnet (SPM) or those of interior permanent magnets (IPM).When SPM, permanent magnet 150 is attached to the outer surface of rotor core 110.When IPM, permanent magnet 150 is imbedded in rotor core 110.Compared with SPM, when IPM, unlikely from rotor core 110 separately, reluctance torque (reluctanttorque) can be used permanent magnet 150 energetically.It should be noted that IPM is readily known to those persons skilled in the art, those as typically used in the motor for the compressor in such as air-conditioning equipment or refrigerator etc.
Fig. 3 is the perspective view of an example of stator 200.In this example, stator 200 comprises the first stator core 210, first tooth 220 and coil 230.First stator core 210 can be the lamination of the annular metal sheet on the direction of rotation Z.First tooth 220 can the first stator core 210 be circumferentially arranged in annularly with equal interval the first stator core 210 on the direction of rotation Z with on a surface faced by the permanent magnet 150 of rotor 100.Multiple first slit 250 is formed in due to the first tooth 220 to hold respectively around the coil 230 that the first tooth 220 is wound around between first tooth 220, and each first slit 250 has the shape (having three limits of rectangle) of recessed shape or segment rectangle.First slit 250 can circumferentially arranging with equal interval at the first stator core 210.In other words, the first tooth 220 and the first slit 250 annularly (that is, at the first stator core 210 circumferentially) alternating with each other.
Coil 230 can by making insulator (not shown) plug between online and the first tooth 220 around the first tooth 220 wrap wire and formed respectively.Relation between the number of the first tooth 220 that the number of the permanent magnet 150 of rotor 100 and coil 230 are wound around around it will be described subsequently.
Fig. 4 A is the perspective view of the brushless electric machine 10 of Fig. 1 in the assembled state, and Fig. 4 B is the partial cross section of the brushless electric machine 10 after the assembling of Fig. 4 A.Fig. 5 illustrates the bottom plan view of stator 200 under the assembled state be wound around around the first tooth 220 at coil 230 and has the plan view from above of rotor 100 of the permanent magnet 150 be assembled on rotor core 110.
With reference to Fig. 4 A, 4B and Fig. 5, rotor 100 and stator 200 can be arranged so that the permanent magnet 150 of rotor 100 on the direction of rotation Z respectively in the face of being arranged on the end 221 of the first tooth 220 on the first stator core 210.That is, the upper surface of permanent magnet 150 is relative with the lower surface of the first tooth 220.By this layout, air gap 400 is formed between the permanent magnet 150 of rotor 100 and the respective end 221 of the first tooth 220, and therefore rotor 100 and stator 200 are spaced apart from each other predetermined small distance on the direction of rotation Z.
But in an alternate embodiment of the invention, positioned opposite between rotor 100 and stator 200 can be different.Such as, rotor 100 can be arranged on certain distance on stator 200 alternatively on the direction of rotation Z.The position that coil 230 is wound around is not limited to the first tooth 220 in stator 200, as visible in other examples described below.
Fig. 4 C is the perspective view of another embodiment of the brushless electric machine being designated as 10a.In this example, compared with motor 10, multiple coil 230 is wound around in that orthogonal direction.That is, the coil 230 of motor 10a is wound around around the top of the first slit 250 and the first stator core 210 thus is positioned partially at respectively in described multiple first slit 250 respectively.Therefore, in figure 4 c, coil 230 is arranged annularly with equal interval between the first tooth 220.Compared with being wound around with around the first tooth 220, when coil 230 is wound around around the first stator core 210 respectively as in motor 10a, coil 230 can be readily assembled in stator 200.
Because rotor 100 and stator 200 or 200a as described above together be arranged on the direction of rotation Z, in the drive system formed along rotation (such as, for driving in the drive system of the lens of imaging device etc.), lens etc. can be arranged in hollow rotor 100 and stator 200 (or 200a).Therefore, drive system more easily can be constructed and can be had compact size.
In brushless electric machine 10 or 10a, apply electrical current to respectively when the coil 230 of the first tooth 220 winding when electric current applies circuit, the first tooth 220/ coil 230 has N pole alternating with each other and S pole polarity.Therefore, the tangent direction of rotor 100 applies the attraction that produced by the magnetic force of the permanent magnet 150 of the first tooth 220/ coil 230 and rotor and repulsive force, rotor 100 thus rotate.
In brushless electric machine 10 as above, 10a, the number of the first stator tooth 220 is different from the number of permanent magnet 150.But, if the first stator tooth 220 and permanent magnet 150 are arranged correspondingly, then can for corresponding respectively to each correspondence setting driving stage (drivingstage) between the first tooth 220 each other and magnet 150.
On the other hand, need, in the drive unit of high moment of torsion, can use brushless electric machine 10 or 10a during low speed rotation, wherein the number of the first stator tooth 220 is different from the number of permanent magnet 150.In the concrete example shown in Fig. 1 to 4B and Fig. 5, in motor 10, adopt 12 magnets 150 and nine tooth 220/ coils 230.
In the example of Fig. 1 to 4B and Fig. 5, brushless electric machine 10 adopts " vernier (vernier) structure ", and therefore the first stator tooth 220 and permanent magnet 150 can not correspond respectively to each other.(should note, in the motor 10a of Fig. 4 C, the number of stator tooth 220 is illustrated as the number of the magnetic dipole equaling rotor 100, but alternatively, they can be different, make cursor structure also can be applied to the structure of the motor 10a of Fig. 4 C, wherein this Fig. 4 C motor 10a there is the coil 230 be wound around around the top of slit 250 and stator core 210.Below describe and refer to motor 10 but can be applicable to motor 10a equally.) application cursor structure brushless electric machine 10 can be expressed as equation (1):
Z
2＝Z
1±P……(1)
Z
2: the number of the magnetic dipole of rotor 100,
Z
1: the number of the first tooth 220 of stator 200,
P: the number of the magnetic dipole of stator 200.
In equation (1), Z
2represent the number of the magnetic dipole formed by the permanent magnet 150 of rotor 100, P represents the number of the magnetic dipole formed by the coil 230 of stator 200.Such as, the rotor 100 due to the brushless electric machine 10 of Fig. 5 comprises 12 permanent magnets 150, so the number of the magnetic dipole of rotor 100 is 6.Stator 200 is included in circumferentially arrange 9 the first teeth 220 of the first stator core 210.In three-phase brushless motor 10, nine the first teeth 220 are arranged with equal interval, and coil 230 is wound around around nine the first teeth 220 respectively.Therefore, the number of the magnetic dipole of stator 200 is 3.In other words, when using three-phase brushless motor 10, the number being arranged in the first tooth 220 on the first stator core 210 can be the multiple of 3, and the number being arranged in the permanent magnet 150 on rotor 100 can be determined to correspond to the number of the first tooth 220 according to equation (1).Although be illustrated as three-phase brushless motor in the embodiment that brushless electric machine 10 describes herein, but in other embodiments, the number of the first tooth 220 and the number of permanent magnet 150 can depend on the type of brushless electric machine 10 and change, as long as described number meets equation (1).In addition, the multi-phase motor except three-phase is considered.
The speed applying the brushless electric machine 10 of cursor structure can be less than the speed of common brushless electric machine, and the ratio of the former with the latter is P/Z
2, therefore torque density can increase.Therefore, the brushless electric machine 10 of Fig. 1-5 can be driven with the half of the speed of common brushless electric machine, and can produce the moment of torsion of the twice of the moment of torsion that common brushless electric machine produces.Therefore, the brushless electric machine 10 of Fig. 1-5 can be applied to the drive unit needing high moment of torsion when using with low speed, such as, for driving lens or the drive unit of the lens barrel of mounted lens on it of imaging device.
Fig. 6 A is the decomposition diagram of the brushless electric machine 10' according to embodiment of the present disclosure, and this brushless electric machine 10' can construct by changing the stator 200 of the brushless electric machine 10 of Fig. 1.Fig. 6 B is the perspective view after the assembling of the brushless electric machine of Fig. 6 A, and Fig. 6 C is the fragmentary, perspective view of the brushless electric machine of Fig. 6 A.
In hollow-core construction (such as installing structure or the lens barrel of mounted lens on it of the lens of imaging device), space for constructing brushless electric machine 10 can be directly related with the size of the lens barrel of imaging device, therefore needs brushless electric machine 10 to be arranged in the restricted radius of rotation Z.But can reduce magnetic force thereon to the restriction in the space for constructing brushless electric machine 10 and be applied in the area on the surface between stator 200 and rotor 100, also can reduce the winding number of each coil 230, therefore the moment of torsion of brushless electric machine 10 can reduce.
With reference to the rotor 100 that Fig. 6 A and 6B, brushless electric machine 10' comprise stator 200' and rotate relative to stator 200'.Stator 200' comprise there is hollow shape the first stator core 211, each extend on the direction of rotation Z and annularly (namely at the first stator core 211 circumferentially) arrange the first tooth 220-1, there is hollow shape and the first tooth 220-1 the second stator core 212 from its outstanding top surface.One end of each first tooth 220-1 can be connected to the second stator core 212.Second tooth 222 eachly can extend and can be arranged in the second stator core 212 circumferentially on the direction of rotation Z.Coil 230 can be wound around around the first tooth 220-1 respectively.Although show the first tooth 220-1 to be connected via the second stator core 212 with the second tooth 222, in other design, the first tooth 220-1 and the second tooth 222 can be directly connected to each other, instead of are connected to each other via the second stator core 212.
With reference to Fig. 6 C, coil 230 can be wound around around the first tooth 220-1, and the end 222-1 of the second tooth 222 respectively in the face of the permanent magnet 150 of rotor 100, magnetic flux interlinkage (magneticfluxinterlinkage) therefore can occur.In this case, each first tooth 220-1 can be less than the width T2 in the radial direction of each second tooth 222 at stator 200' at the width T1 in the radial direction of stator 200'.Therefore, even if when coil 230 is wound around around the first tooth 220-1 respectively, the width T1 of each first tooth 220-1 and each coil 230 also can be less than or equal to the width T2 in the radial direction of each second tooth 222 at stator 200' at the summation T3 of the width in the radial direction of stator 200'.
Because each first tooth 220-1 is set to be less than the width T2 in the radial direction of each second tooth 222 at stator 200', so brushless electric machine 10' can be arranged in the restricted radius of rotation Z at the width T1 in the radial direction of stator 200'.And the number of the winding of each coil 230 can be increased by each first tooth 220-1 of reduction width T1 in radial directions, and therefore the moment of torsion of brushless electric machine 10' can by increasing magnetic flux interlinkage via the first tooth 220-1 and the second tooth 222 and increase.
Second tooth 222 is arranged to the permanent magnet 150 in the face of rotor 100, therefore magnetic flux interlinkage can occur.In this case, each second tooth 222 can be set to be greater than each first tooth 220-1 width T1 in the radial direction thereof at the width T2 in the radial direction of stator 200', and has nothing to do with the winding number of each coil 230.Therefore, the area of the end 222-1 of each second tooth 222 can be set equal to the area of the end 221 of each first tooth 220 of Fig. 4 B in the embodiment described before motor 10.Therefore, compared with the brushless electric machine 10 of Fig. 1, the brushless electric machine 10' of Fig. 6 A-6C can be arranged in the confined radius of rotation Z, and still can keep or increase the number that magnetic force is thereon applied in the area on the surface between stator 200' and rotor 100 and the winding of each coil 230.Thus, compared with the moment of torsion of brushless electric machine 10, can keep or increase the moment of torsion of brushless electric machine 10'.
Fig. 7 A and 7B is the stator 200 according to another embodiment of the present disclosure respectively " and brushless electric machine 10 " perspective view.Fig. 7 C is the brushless electric machine 10 of Fig. 7 B " rotor 100 and stator 200 " plane graph.(note, the number of the magnet 150 in the example rotor 100 of Fig. 7 C is different from the number of the rotor 100 of Fig. 1, but general structure can be identical.)
With reference to Fig. 7 A and 7B, the first tooth 220 is arranged on the first stator core 210 with the 3rd tooth 280 (that is, tooth 280a, 280b) being connected to the first tooth 220.(note, any tooth 280a or 280b is an example of tooth 280.) be arranged on the one end 221 of each first tooth 220 be arranged on the first stator core 210 at the connecting elements 260 circumferentially extended of the first stator core 210, the 3rd tooth 280a and 280b is separately positioned on the two ends of connecting elements 260.
Each 3rd tooth 280 extends from connecting elements 260 on the direction of rotation Z, and the second slit 290 is formed between the 3rd adjacent tooth 280a and 280b.The end 281 of the 3rd tooth 280 can permanent magnet 150 respectively in the face of rotor 100 on the direction of rotation Z.
Multiple coil 230 can by making insulator (not shown) plug between online and the first tooth 220 around the first tooth 220 wrap wire and formed respectively.
With reference to Fig. 7 C, brushless electric machine 10 " can cursor structure be adopted, as the embodiment of Fig. 1, therefore stator 200 " the 3rd tooth 280 and the permanent magnet 150 of rotor 100 can not correspond respectively to each other.But, adopt wherein the 3rd tooth 280 to be arranged in the brushless electric machine 10 of the cursor structure on the first tooth 220 " equation (2) can be expressed as:
P
r＝N
s-P
s(2)
P
r: the number of the magnetic dipole of rotor 100,
N
s: stator 200 " the number of dipole of the 3rd tooth 280,
P
s: stator 200 " the number of dipole of the first tooth 220.
In equation (2), P
rrepresent the number of the magnetic dipole formed by the permanent magnet 150 of rotor 100, P
srepresent by around stator 200 " the number of dipole that formed of the coil 230 that is wound around of the first tooth 220, N
srepresent by interacting with the permanent magnet 150 of rotor 100 by stator 200 " the number of dipole that formed of the 3rd tooth 280.Such as, the brushless electric machine 10 due to Fig. 7 C " rotor 100 comprise 30 permanent magnets 150, so the number of the magnetic dipole of rotor 100 is 15.Stator 200 " comprise circumferentially nine the first teeth 220,18 the 3rd teeth 280 being arranged in the first stator core 210 and be arranged on the end 221 of the first tooth 220.At three-phase brushless motor 10 " in, because coil 230 is wound around, so stator 200 around described nine the first teeth 220 respectively " the number of magnetic dipole of the first tooth 220 be 3.In addition, due to stator 200 " the 3rd tooth 280 and the magnetic dipolar interaction be arranged in the permanent magnet 150 of rotor 100, so stator 200 " the number of dipole of the 3rd tooth 280 be 18.Therefore, can determine, the brushless electric machine 10 of Fig. 7 C " there is the cursor structure of the condition meeting equation (2).
Compared with common brushless electric machine, cursor structure is applied to its brushless electric machine 10 " automatic reduction effect as shown in equation (3) can be obtained:
G
r＝(P
s-N
s)/P
s(3)
In equation (3), G
rrepresent and automatically reduce ratio.Brushless electric machine 10 at Fig. 7 B " in, the automatic reduction effect of 1/5 of the automatic reduction effect corresponding to common brushless electric machine can be produced.Therefore, have and brushless electric machine 10 with comprising " the common brushless electric machine ratio of identical polarity, cursor structure is applied to its brushless electric machine 10 " torque density can be its five times large.
Fig. 8 A is the brushless electric machine 10 according to another embodiment of the present disclosure " ' decomposition diagram, this brushless electric machine 10 " ' obtain by the stator 200 of the brushless electric machine 10 changing Fig. 1.Fig. 8 B is the perspective view after the assembling of the brushless electric machine of Fig. 8 A.Fig. 8 C is the fragmentary, perspective view of the brushless electric machine of Fig. 8 A.
With reference to Fig. 8 A and 8B, brushless electric machine 10 " ' comprise stator 200 " ' and relative to stator 200 " ' the rotor 100 that rotates.Stator 200 " ' comprise there is hollow interior the first flat annular stator core 211, each extend on the direction of rotation Z and be arranged in the first stator core 211 the first tooth 220-1 circumferentially, there is hollow shape and be connected to second stator core 212 of one end of each first tooth 220-1 and eachly extend on the direction of rotation Z and be arranged in the 3rd tooth 280 circumferentially of the second stator core 212.Coil 230 can be wound around around the first tooth 220-1 respectively.Although show the first tooth 220-1 to be connected via the second stator core 212 with the 3rd tooth 280, the first tooth 220-1 and the 3rd tooth 280 can be directly connected to each other, instead of connect via the second stator core 212.
With reference to Fig. 8 C, each first tooth 220-1 is at stator 200 " the width T5 in the radial direction of ' width T1 in the radial direction can be set smaller than each 3rd tooth 280 at stator 200 " '.Therefore, the brushless electric machine 10 of Fig. 8 A-8C can be arranged in the confined radius of rotation Z, and can keep or increase magnetic force thereon and be applied in stator 200 " ' and rotor 100 between the area on surface and the winding number of each coil 230, therefore can keep or increase brushless electric machine 10 " ' moment of torsion.Width T5 is applied in stator 200 with magnetic force thereon " ' and rotor 100 between the area on surface and the winding number of each coil 230 between the details of relation can describe with reference to Fig. 6 C with above those are identical, therefore omit the description of its repetition herein.
Fig. 9 A and 9B is stator 200 according to another embodiment of the present invention respectively
iVwith brushless electric machine 10
iVperspective view.Fig. 9 C is rotor 100 and the stator 200 of the brushless electric machine 10 of Fig. 9 B
iVplane graph.
With reference to Fig. 9 A and 9B, the first tooth 220 is arranged on the first stator core 210 with the 3rd tooth 320 being connected to the first tooth 220.(in this discusses, reference marks 320 refers to any tooth 320a, 320b or 320c.Each tooth 320a, 320b and 320c are examples of tooth 320.) be arranged on the one end 221 of each first tooth 220 be arranged on the first stator core 210 at the connecting elements 260 circumferentially extended of the first stator core 210, on the 3rd tooth 320a, 320b and 320c is arranged in connecting elements 260 respectively two ends with equal intervals and between described two ends spatially.
3rd slit 330 (comprising 330a and 330b) is formed between the 3rd tooth 320a, 320b and 320c, and the end 321 of the 3rd tooth 320a, 320b and 320c respectively on the direction of rotation Z to the permanent magnet 150 of rotor 100.
With reference to Fig. 9 C, 48 permanent magnets 150 are arranged in brushless electric machine 10
iVrotor 100 on, stator 200
iVcomprise circumferentially nine the first teeth 220,27 the 3rd teeth 320a, 320b, 320c of being arranged in the first stator core 210 to be arranged in the respective end 221 of the first tooth 220.Therefore, the number of the magnetic dipole of rotor 100 is 24, stator 200
iVthe number of dipole of the first tooth 220 be 3, stator 200
iVthe number of dipole of the 3rd tooth 320 be 27.Therefore, can determine, the brushless electric machine 10 of Fig. 9 B
iVthere is the cursor structure of the condition meeting equation (2).
According to formula (3), can determine, the brushless electric machine 10 of Fig. 9 B
iVproduce the automatic reduction effect of 1/8 of the automatic reduction effect corresponding to common brushless electric machine.Application cursor structure is to the brushless electric machine 10 of its Fig. 9 A-9C
iVtorque density can be increased to the brushless electric machine 10 had with Fig. 9 A-9C
iVthe octuple of the torque density of the common brushless electric machine of identical polar.
According to an embodiment of the present disclosure, be connected to the 3rd tooth 280 of the first tooth 220 or the number of the 3rd tooth 320 is 2 or 3, but in other embodiments, more 3rd tooth can be connected to each first tooth.As long as the condition of formula (2) is satisfied, 3 or more teeth can be connected to any first tooth 220.When 3 or more teeth are connected to one or more first tooth 220, the interval be arranged between the multiple teeth on the first tooth 220 reduces, and therefore can reduce leakage flux.In addition, the useful flux linked with coil 230 can increase, and therefore the moment of torsion of brushless electric machine 10 can increase.
According to one or more embodiment of the present disclosure, because rotor and stator are relative to each other arranged in the direction of the axis of rotation, so can realize the drive system for arranging structure in the direction of the axis of rotation, and whole drive system can be reduced or miniaturization.
By application cursor structure to brushless electric machine, high moment of torsion can produce during low speed rotation.
Even if when in the confined radius that brushless electric machine is arranged on rotating shaft, also can keep or increase the moment of torsion of brushless electric machine.
Should be appreciated that one exemplary embodiment described herein should only be understood with descriptive sense, instead of the object in order to limit.Feature in each embodiment or in description should usually be considered to can be used for other similar characteristics in other embodiment or in.
To be interpreted as containing odd number and plural number in the term " " of the context context of claim (particularly in), the use of " " and " being somebody's turn to do " that describe the present invention's design.In addition, the record of number range herein is only intended to be used as to mention the shorthand method of each independent value dropped within the scope of this respectively, unless additionally indicated here, each independent value to be incorporated in specification here as it is recorded individually.In addition, methodical step described herein can be carried out with any applicable order, unless additionally instruction or otherwise contradiction obvious with context here.The disclosure is not limited to the described order of these steps.The use of any and all examples provided here or exemplary language (such as, " such as ") is only intended to the present invention is described best and does not apply restriction to the scope of the present invention's design, unless additionally requirement.Many modification and improvement will be obviously for those of ordinary skills, and not deviate from the spirit and scope of the present invention's design.
The rights and interests of the korean patent application No.2014-0162607 that this application claims the korean patent application No.2014-0071072 that submits in Korean Intellectual Property Office on June 11st, 2014 and submit on November 20th, 2014 in Korean Intellectual Property Office, their disclosure by reference entirety is herein incorporated.
Claims (15)
1. a brushless electric machine, comprising:
Rotor, comprises multiple permanent magnet arranged annularly, and the plurality of permanent magnet is around the rotation of described rotor N pole alternating with each other and S pole; With
Stator, comprises and to arrange annularly and to the first tooth of described multiple permanent magnet and correspond to multiple coils of described first tooth on the direction of described rotation,
The number Z of the magnetic dipole of wherein said multiple permanent magnet
2, the first tooth number Z
1with the pass between the number P of the magnetic dipole of described stator is Z
2=Z
1± P.
2. brushless electric machine as claimed in claim 1, wherein said rotor also comprises and has hollow interior and the rotor core supporting described multiple permanent magnet, and
Described stator also comprises and has hollow interior and the first stator core supporting described first tooth.
3. brushless electric machine as claimed in claim 2, wherein said multiple coil is wound around around described first tooth.
4. brushless electric machine as claimed in claim 2, wherein:
Described first tooth in the circular path around described rotation with equal interval separated from one another arrange, and multiple first slit is formed between described first tooth, and
Described multiple coil is wound around around described first stator core and makes described multiple coil correspond to described multiple first slit.
5. brushless electric machine as claimed in claim 3, also comprise the second tooth, this second tooth is connected respectively to the part of described first tooth and is arranged as to described multiple permanent magnet on the direction of described rotation,
Wherein each described second tooth is greater than the width in the radial direction of each described first tooth at described stator at the width in the radial direction of described stator.
6. brushless electric machine as claimed in claim 5, also comprises and has hollow shape, to be plugged between described first tooth and described second tooth and to make the second stator core that described second tooth is connected to each other.
7. brushless electric machine as claimed in claim 5, wherein each described second tooth is equal to or greater than the width in the radial direction of each described first tooth at described stator and the width sum of each coil in the described multiple coil be wound around around described first tooth at the width in the radial direction of described stator.
8. a brushless electric machine, comprising:
Rotor, comprises multiple permanent magnet, and the plurality of permanent magnet is around the rotating shaft of described rotor N pole alternating with each other annularly and S pole; With
Stator,
Wherein said stator comprises:
Arrange annularly and each the first tooth extended on the direction of rotation;
Multiple coil, corresponding to described first tooth;
Multiple connecting elements, extends from the first tooth respectively; And
3rd tooth, is arranged on described multiple connecting elements and makes described 3rd tooth on the direction of rotation to described multiple permanent magnet.
9. brushless electric machine as claimed in claim 8, the number P of the magnetic dipole of wherein said multiple permanent magnet
r, described 3rd tooth the number N of dipole
swith the number P of the dipole of described first tooth
sbetween pass be P
r=N
s-P
s.
10. brushless electric machine as claimed in claim 8, also comprises and has hollow interior and support the rotor core of described multiple permanent magnet and have hollow interior and support the first stator core of described first tooth.
11. brushless electric machines as claimed in claim 8, wherein said multiple coil is wound around around described first tooth.
12. brushless electric machines as claimed in claim 10, wherein said first tooth in the circular path around described rotation with equal interval separated from one another arrange, multiple first slit is formed between described first tooth.
13. brushless electric machines as claimed in claim 8, wherein said 3rd tooth in the circular path around described rotation with equal interval separated from one another arrange, multiple second slit is formed between described 3rd tooth.
14. brushless electric machines as claimed in claim 10, wherein each described 3rd tooth is greater than the width in the radial direction of each described first tooth at described stator at the width in the radial direction from described rotation of described stator.
15. brushless electric machines as claimed in claim 14, wherein each described 3rd tooth is equal to or greater than the width in the radial direction of each described first tooth at described stator and the width sum of each coil in the described multiple coil be wound around around described first tooth at the width in the radial direction of described stator.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20140071072 | 2014-06-11 | ||
| KR10-2014-0071072 | 2014-06-11 | ||
| KR1020140162607A KR20150142575A (en) | 2014-06-11 | 2014-11-20 | Brushless motor |
| KR10-2014-0162607 | 2014-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105281523A true CN105281523A (en) | 2016-01-27 |
Family
ID=55081838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510319314.2A Pending CN105281523A (en) | 2014-06-11 | 2015-06-11 | Brushless motor |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20150142575A (en) |
| CN (1) | CN105281523A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253530A (en) * | 2016-09-04 | 2016-12-21 | 华中科技大学 | A kind of across two tooth concentratred winding vernier magnetoes |
| CN108496298A (en) * | 2017-04-28 | 2018-09-04 | 深圳市大疆创新科技有限公司 | Driving device, laser measuring device for measuring and mobile platform |
| CN109599961A (en) * | 2018-11-14 | 2019-04-09 | 歌尔股份有限公司 | A kind of brushless motor and mechanical arm |
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| JP2001298922A (en) * | 2000-04-10 | 2001-10-26 | Fuji Electric Co Ltd | Vernier motor |
| JP2008193842A (en) * | 2007-02-06 | 2008-08-21 | Daikin Ind Ltd | Axial gap type rotating electric machine |
| CN101557129A (en) * | 2008-04-10 | 2009-10-14 | 伯吉斯-诺顿制造有限公司 | Manufacture of electric motor component |
| CN101789666A (en) * | 2004-12-09 | 2010-07-28 | 雅马哈发动机株式会社 | rotary electrical machine |
| CN102570750A (en) * | 2012-01-17 | 2012-07-11 | 东南大学 | Disk-type low-speed high-torque permanent-magnet cursor motor |
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| JP2001298922A (en) * | 2000-04-10 | 2001-10-26 | Fuji Electric Co Ltd | Vernier motor |
| CN101789666A (en) * | 2004-12-09 | 2010-07-28 | 雅马哈发动机株式会社 | rotary electrical machine |
| JP2008193842A (en) * | 2007-02-06 | 2008-08-21 | Daikin Ind Ltd | Axial gap type rotating electric machine |
| CN101557129A (en) * | 2008-04-10 | 2009-10-14 | 伯吉斯-诺顿制造有限公司 | Manufacture of electric motor component |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253530A (en) * | 2016-09-04 | 2016-12-21 | 华中科技大学 | A kind of across two tooth concentratred winding vernier magnetoes |
| CN106253530B (en) * | 2016-09-04 | 2019-04-12 | 华中科技大学 | One kind is across two tooth concentratred winding vernier magnetoes |
| CN108496298A (en) * | 2017-04-28 | 2018-09-04 | 深圳市大疆创新科技有限公司 | Driving device, laser measuring device for measuring and mobile platform |
| CN108496298B (en) * | 2017-04-28 | 2020-04-17 | 深圳市大疆创新科技有限公司 | Driving device, laser measuring device and mobile platform |
| CN111342631A (en) * | 2017-04-28 | 2020-06-26 | 深圳市大疆创新科技有限公司 | Driving device, laser measuring device and mobile platform |
| CN111342631B (en) * | 2017-04-28 | 2021-04-02 | 深圳市大疆创新科技有限公司 | Driving device, laser measuring device and mobile platform |
| US11469655B2 (en) | 2017-04-28 | 2022-10-11 | SZ DJI Technology Co., Ltd. | Driving device, laser measurement device and movable platform |
| CN109599961A (en) * | 2018-11-14 | 2019-04-09 | 歌尔股份有限公司 | A kind of brushless motor and mechanical arm |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20150142575A (en) | 2015-12-22 |
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Application publication date: 20160127 |