CN112271836A - Stator, Motor and Compressor - Google Patents
Stator, Motor and Compressor Download PDFInfo
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- CN112271836A CN112271836A CN202011211225.3A CN202011211225A CN112271836A CN 112271836 A CN112271836 A CN 112271836A CN 202011211225 A CN202011211225 A CN 202011211225A CN 112271836 A CN112271836 A CN 112271836A
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- 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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- 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
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- 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
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Abstract
本发明提出了一种定子、电机和压缩机，其中，定子包括：定子轭，定子轭呈环形结构；多个定子齿，设置于定子轭的内圈，其中，以垂直于定子轭的轴线的方向对定子齿进行截面，在截面上，定子齿背离定子轭的一侧的轮廓线包括相连接的第一段和第二段，第二段包括第一端和第二端，第一端与第一段相连接的，第二端背离第一段，第二段由与第一端到第二端逐渐远离定子轭的中心。本发明提出的定子，在使用时，定子轭的内圈内部配置有转子，转子的转动方向为第二段到第一段的方向，在转子转入定子齿时，起始的气隙得到增大，进而降低了局部饱和效应，减弱气隙磁场的畸变，降低了电机的谐波含量，提升电机效率，减小了转矩的波动。
The present invention provides a stator, a motor and a compressor, wherein the stator includes: a stator yoke, the stator yoke is annular; On the cross section, the contour line of the side of the stator tooth facing away from the stator yoke includes a first segment and a second segment that are connected, and the second segment includes a first end and a second end. When the first segment is connected, the second end faces away from the first segment, and the second segment gradually moves away from the center of the stator yoke from the first end to the second end. For the stator proposed by the present invention, when in use, a rotor is arranged inside the inner ring of the stator yoke, and the rotation direction of the rotor is the direction from the second segment to the first segment. When the rotor is turned into the stator teeth, the initial air gap is increased. It reduces the local saturation effect, weakens the distortion of the air gap magnetic field, reduces the harmonic content of the motor, improves the motor efficiency, and reduces the torque fluctuation.
Description
Technical Field
The invention relates to the field of motors, in particular to a stator, a motor and a compressor.
Background
With continuous deepening of the direct current technology in the fields of electric appliances and automobile motors, the requirements on the operation energy efficiency of one-way operation motors such as fans, compressors and motors are higher and higher, and centralized winding structure motors are used in more occasions. The problems of large torque fluctuation and low motor efficiency still exist in the application process of the existing motor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art or improving the art.
To this end, a first aspect of the invention proposes a stator.
A second aspect of the invention provides an electric machine.
A third aspect of the present invention provides a compressor.
In view of the above, according to a first aspect of the present invention, there is provided a stator including: the stator yoke is of an annular structure; the stator comprises a plurality of stator teeth, a plurality of stator yokes and a plurality of second sections, wherein the plurality of stator teeth are arranged in an inner ring of the stator yokes, the stator teeth are sectioned in the direction perpendicular to the axis of the stator yokes, in the section, the contour line of one side, deviating from the stator yokes, of the stator teeth comprises a first section and a second section which are connected, the second section comprises a first end and a second end, the first end is connected with the first section, the second end deviates from the first section, and the second section is gradually far away from the center of the stator yokes from the first end to the.
The stator provided by the invention comprises a stator yoke and stator teeth, wherein the stator yoke is of an annular structure, and a plurality of stator teeth are arranged on an inner ring of the stator yoke. And, carry out the cross-section to the stator tooth with the direction of the axis of perpendicular to stator yoke, on the cross-section, the contour line of one side that the stator tooth deviates from stator yoke includes first section and second section, and first section is connected with the second section, and the second section includes first end, and first end and first section are connected, and the second section still includes the second end, and the second end deviates from first section. Wherein the second segment gradually moves away from the center of the stator yoke from the first end to the second end.
Specifically, when using, the inside rotor that disposes of inner circle of stator yoke, the direction of rotation of rotor is the direction of second section to first section, and because the second end of second section is kept away from the center of stator yoke, consequently, when the rotor changes into the stator tooth, just go into promptly initial air gap and obtain the increase, and the increase of air gap can increase the magnetic circuit pressure drop of air gap side, and then the magnetic saturation of stator tooth second section will greatly reduced, and then reduced local saturation effect, weaken the distortion of air gap magnetic field, the harmonic content of motor has been reduced, promote motor efficiency, the fluctuation of torque has been reduced.
In addition, the first section is gradually far away from the center of the stator yoke from the first end to the second end, and then the air gap is gradually reduced when the rotor rotates, namely the magnetic saturation is gradually improved, so that the increase of radial force caused by the change of the cliff type air gap is avoided, the motor is ensured to have sufficient output power, and the noise of the motor is reduced.
In addition, according to the stator in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, further, the stator teeth include: the stator tooth body is arranged on the inner ring of the stator yoke; the stator pole shoe is arranged at one end, deviating from the stator yoke, of the stator tooth body, and the first section and the second section are arranged on one side, deviating from the stator tooth body, of the stator pole shoe.
In the technical scheme, the stator teeth comprise stator tooth bodies and stator pole shoes, and the stator tooth bodies are arranged between the stator yoke and the stator pole shoes.
In any of the above technical solutions, further, the first segment is in the shape of a circular arc, and the first segment is concentric with the stator yoke.
In the technical scheme, the first section is arc-shaped and is concentric with the stator yoke, so that the air gap between the rotor and the stator is consistent at the position of the first section, the flux density of the air gap at the first section is the same, and the efficiency of the motor is improved.
In any of the above technical solutions, further, the stator pole shoe further includes: the first side edge is connected with the first section and is positioned on one side of the first section, which is far away from the second section; a second side edge connected with the second section and located at the secondA side of the segment facing away from the first segment, wherein the stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, and in the section, the length of the first side is th, the length of the second side is th1, the intersection point of the extension line of the first segment and the extension line of the second side is point D, the length from the second end to the point D is th2, th is not less than th1+ th2,
in the technical scheme, a first side edge and a second side edge are respectively arranged on two sides of the first section and the second section on the stator pole shoe. The stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, the length of a first side edge is th, the length of a second side edge is th1, extension lines are respectively arranged on the first section and the second side edge, the extension lines of the first section and the second side edge are intersected at a point D, the length from a second end of the second section to the point D is th2, wherein th is more than or equal to th1+ th2,
and then inject the degree that the magnetic pressure reduces in reasonable scope, avoid the air gap too big to inject the power output of motor in the better scope of meaning, and, rationalize the size on first side and second side, thereby compensate the influence that the second section increase air gap brought, promote the output of motor.
In any of the above solutions, further, the stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, and in the section, the stator pole shoes occupy the stator yoke at a circumferential angle β s, and the first segment occupies the stator yoke at a circumferential angle β s
The second segment occupies the stator yoke at an angle y 2, wherein,
in the technical scheme, the method comprises the following steps
The length of injecing first section and second section, injecing the whole distance of second section that the air gap changes promptly, injecing the part that the air gap changes in a scope, and then rationalize the change of air gap to when reducing the magnetic saturation, guaranteed that the air gap of the first section position that the magnetic saturation is not obvious has good air gap flux density, when having reduced the fluctuation of torque, guaranteed the output of motor.
In any of the above aspects, further, the stator yoke includes: the stator yoke comprises a plurality of stator units, wherein the stator units are sequentially connected to form an annular structure so as to form a stator yoke, and one stator tooth is connected to any one of the stator units.
In the technical scheme, the stator yoke is provided with a plurality of stator units, and one stator unit is connected with one stator tooth, so that the structural uniformity of the whole stator is ensured.
In any of the above solutions, further, the stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, and in the section, one stator unit occupies the stator yoke with a circumferential angle α s, the number of poles of the stator is ps, the stator pole shoes occupy the stator yoke with a circumferential angle β s,
β s ═ k α s, where 0.5 < k < 1.
In the technical scheme, the whole range of the air gap is limited by limiting the circumferential angle occupied by the stator pole shoe, so that the range of the second section of the air gap change part is indirectly limited, the air gap at the first section with unobvious magnetic saturation is ensured to have good air gap flux density while the magnetic saturation is reduced, and the output power of the motor is ensured while the fluctuation of the torque is reduced. And, thereby limited the length of notch, and the loss of motor can be concerned with to the length of notch, and then limits the loss of motor in a better scope, promotes the efficiency of motor.
In any of the above technical solutions, further, the second section is a curved section or a straight section.
In this embodiment, the second segment may be a curved segment or a straight segment.
According to a second aspect of the invention, the invention proposes an electrical machine comprising: the stator proposed by any one of the above technical solutions; and the rotor is arranged on the inner ring of the stator yoke, and the rotation direction of the rotor is the direction from the second section to the first section.
The motor provided by the invention comprises the stator provided by any one of the above technical solutions, so that all the advantages of the stator provided by any one of the above technical solutions are achieved, and the description is omitted.
In the above technical solution, further, when the first section is an arc section, and the width from the second end of the second section of the stator to the intersection point of the extension line of the first section of the stator and the extension line of the second side of the stator is th2, th2 is less than 2 times the width of the air gap formed between the first section of the stator and the rotor.
In the technical scheme, the variation of the air gap of the second section is limited, the excessive variation of the air gap of the second section is avoided, and the output power of the motor is ensured while the magnetic saturation of the second section is reduced.
According to a third aspect of the present invention, the present invention provides a compressor comprising: the stator proposed by any one of the above technical solutions; or a motor as proposed in any of the above solutions.
The compressor provided by the invention comprises the stator provided by any one of the above technical solutions, so that the compressor has all the advantages of the motor provided by any one of the above technical solutions, and the advantages are not stated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a motor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram illustrating a region corresponding to a stator unit in the motor according to an embodiment of the present invention;
fig. 3 shows a schematic structural view of the motor in the related art 1;
fig. 4 is a schematic structural view showing a part of the motor in related art 2;
fig. 5 shows a schematic structural view of a part of the motor in related art 3;
fig. 6 is a graph showing a relationship between output torque and motor efficiency of the motor according to the embodiment of the present invention and the motors of related art 1, related art 2, and related art 3;
fig. 7 is a graph showing a relationship between a torque ripple factor and an output power of a motor according to an embodiment of the present invention and motors according to related art 1, related art 2, and related art 3.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
100 electric machine, 110 stator, 112 stator yoke, 1122 stator unit, 114 stator teeth, 1142 stator teeth body, 1144 stator pole shoe, 1146 first section, 1148 second section, 1150 first end, 1152 second end, 1154 first side, 1156 second side, 1158 stator front pole shoe, 1160 stator center pole shoe, 1162 stator back pole shoe, 120 rotor;
the correspondence between reference numbers and component names in fig. 3 is:
100 ' motor, 110 ' stator, 112 ' stator yoke, 114 ' stator teeth, 120 ' rotor;
the correspondence between reference numbers and component names in fig. 4 is:
1122 'stator unit, 114' stator teeth, 1142 'stator tooth body, 1144' stator pole shoe, 1146 'first segment, 1148' second segment;
the correspondence between reference numerals and part names in fig. 5 is:
1122 ' stator unit, 114 ' stator teeth, 1142 ' stator tooth body, 1144 ' sub pole shoe, 1146 ' first segment, 1148 ' second segment, 1170 ' third segment.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A stator 110, a motor 100, and a compressor provided according to some embodiments of the present invention are described below with reference to fig. 1 and 2.
Example 1:
as shown in fig. 1 and 2, according to a first aspect of the present invention, there is provided a stator 110 including: a stator yoke 112 and a plurality of stator teeth 114. The stator yoke 112 is in an annular structure, a plurality of stator teeth 114 are uniformly distributed on an inner ring of the stator yoke 112, and a stator slot is formed between two adjacent stator teeth 114 so as to facilitate the arrangement of a winding. When the motor 100 is assembled, the rotor 120 is positioned at the middle of the stator 110, and thus a rotating magnetic field is formed between the rotor 120 and the stator 110 to drive the rotor 120 to rotate.
The stator teeth 114 are sectioned in a direction perpendicular to the axis of the stator yoke 112, and in the section, the side of the stator teeth 114 facing away from the stator yoke 112, i.e., the side facing the rotor 120 after the motor 100 is assembled, has a contour including a first section 1146 and a second section 1148, and the first section 1146 is connected to the second section 1148. Moreover, the second section 1148 has two ends, the end connected to the first section 1146 is a first end 1150C, the end away from the first section 1146 is a second end 1152D, and the second section 1148 gradually gets away from the center of the stator yoke 112 from the first end 1150C to the second end 1152D, i.e. the second section 1148 gradually gets away from the rotor 120 from the first end 1150C to the second end 1152D after the motor 100 is assembled.
In the related art, as shown in fig. 3, the air gap between the stator 110 'and the rotor 120' is generally uniform, i.e., the surface of the side of the stator teeth 114 'facing the rotor 120' is a circular arc. Through simulation analysis, because the concentrated winding motor 100 'rotates along with the rotor 120', the establishment of the winding current and the improvement of the air-gap magnetic field are obviously saturated at the front pole shoe of the stator, namely, the part of the rotor 120 'which initially enters the stator teeth 114' during rotation, and the saturation phenomenon is relatively weak at the back pole shoe of the stator, namely, the part of the rotor 120 'which rotates out of the stator teeth 114'. Armature reaction further aggravates the distortion of the air-gap magnetic field, resulting in a larger harmonic content and significant torque ripple of the motor 100'.
In the stator 110 provided by the present invention, since the first section 1146 gradually gets away from the rotor 120 from the first end 1150C to the second end 1152D, and after the motor 100 is assembled, an air gap is formed between the stator 110 and the rotor 120, and the direction of the rotation of the rotor 120 is shown as ω in fig. 1, that is, the rotor rotates from the second section 1148 to the first section 1146, when the rotor 120 rotates, the air gap is increased when the stator front pole shoe 1158, that is, the stator teeth 114, is initially inserted, so as to reduce the magnetic circuit voltage drop on the air gap side, and further, the magnetic saturation at the second section 1148 of the stator teeth 114, that is, the stator front pole shoe 1158, is greatly reduced, so as to reduce the local saturation effect, weaken the distortion of the air gap magnetic field, reduce the harmonic content of the motor 100, improve the efficiency of the motor 100, and.
Moreover, since the first segment 1146 gradually gets away from the center of the stator yoke 112 from the first end 1150C to the second end 1152D, the air gap gradually becomes smaller when the rotor 120 turns in, i.e., the magnetic saturation gradually increases, so as to avoid the increase of radial force caused by the change of the cliff-type air gap, thereby ensuring that the motor 100 has sufficient output power.
Example 2:
as shown in fig. 2, in addition to embodiment 1, stator teeth 114 further include: stator tooth body 1142 and stator pole shoe 1144, stator pole shoe 1144 includes stator front pole shoe 1158, stator center pole shoe 1160 and stator back pole shoe 1162. The stator teeth body 1142 is disposed at an inner circumference of the stator yoke 112, the stator pole shoe 1144 is disposed at an end of the stator teeth body 1142 facing away from the stator yoke 112, and the first section 1146 and the second section 1148 are disposed at a side of the stator pole shoe 1144 facing away from the stator teeth body 1142, wherein the second section 1148 is at least partially disposed at the stator front pole shoe 1158.
In this embodiment, the stator teeth 114 include a stator tooth body 1142 and a stator pole shoe 1144, the stator tooth body 1142 is disposed between the stator yoke 112 and the stator pole shoe 1144, the stator pole shoe 1144 includes a stator front pole shoe 1158, a stator central pole shoe 1160 and a stator rear pole shoe 1162, the stator front pole shoe 1158 is a portion of the rotor 120 entering the stator pole shoe 1144, the stator rear pole shoe 1162 is a portion of the rotor 120 exiting the stator pole shoe 1144, and the stator central pole shoe 1160 is disposed between the stator front pole shoe 1158 and the stator rear pole shoe 1162.
Example 3:
as shown in fig. 2, in embodiment 1 or embodiment 2, further, the first section 1146 is a circular arc shape, the first section 1146 is concentric with the stator yoke 112, and after the motor 100 is assembled, the first section 1146 is concentric with the rotor 120.
In this embodiment, the first section 1146 is configured as a circular arc section and is concentric with the stator yoke 112, so that after the motor 100 is assembled, the air gap distributed at the first section 1146 has a uniform width, indicated by g, to compensate for the decrease in output power of the motor 100 caused by the increase of the air gap at the second section 1148.
Example 4:
as shown in fig. 2, in addition to any of embodiments 1 to 3, further, the stator pole shoe 1144 further includes first and second side edges 1154 and 1156 disposed on both sides of the first and second sections 1146 and 1148. Specifically, the first side 1154 is located on a side of the first section 1146 facing away from the second section 1148 and is connected to the first section 1146, and the second side 1156 is located on a side of the second section 1148 facing away from the first section 1146 and is connected to the second section 1148.
Wherein the stator teeth 114 are sectioned in a direction perpendicular to the axis of the stator yoke 112, and in the section, the length of the first side 1154 is th, the length of the second side 1156 is th1, the intersection point of the extension line of the first segment 1146 and the extension line of the second side 1156 is Q point, the length from the second end 1152D to the Q point is th2, th is 1+ th2,
specifically, th is a length of the first side 1154 in the radial direction of the stator yoke 112, th1 is a length of the second side 1156 in the radial direction of the stator yoke 112, and th2 is lengths D to Q in the radial direction of the stator yoke 112.
In this embodiment, the distance from the second segment 1148D to the intersection Q of the extension line of the first segment 1146 and the extension line of the second side 1156 is defined as th2, the length of the second side 1156 is defined as th1, and the length of the first side 1154 is defined as th.
Such that th, th1 and th2 satisfy: th is more than or equal to th1+ th2,
and then realize the rational limited to the air gap of second section 1148 end point D department, the rational limited to width and length of notch, and then guarantee that the scope of magnetic pressure reduction is reasonable, prevent to cause great influence to 100 power output of motor, and, further, after making up motor 100, the air gap width that first section 1146 department distributes is g, and then the limited air gap width that is g, and then prescribes a limit to
th1＝th2＝1.4×g。
Further, the magnetic saturation at the first segment 1146 is maintained to a certain degree, so as to compensate the reduction of the output power of the motor 100 caused by the increase of the air gap at the first segment 1146, according to the simulation experiment, the invention limits th to be more than or equal to th1+ th2,
magnetic saturation at the magnetic saturation second section 1148 of the first section 1146 forms a better fit, so that the output power of the motor 100 is ensured while the harmonic content and torque fluctuation of the motor 100 are reduced.
Example 5:
as shown in fig. 2, in addition to any one of embodiments 1 to 4, stator teeth 114 are further sectioned in a direction perpendicular to the axis of stator yoke 112In this regard, the stator pole shoe 1144 occupies the stator yoke 112 at a circumferential angle β s, and the first segment 1146 occupies the stator yoke 112 at a circumferential angle β s
The second segment 1148 occupies the stator yoke 112 at an angle y 2, wherein,
specifically, the circumferential angle of the stator yoke 112 is 360 °.
In this embodiment, the magnetic saturation is not significant at the portion of the first section 1146 on the side facing away from the second section 1148, and thus, there is no need to increase the air gap, and the invention defines
Starting at the first end 1150C of the second segment 1148, the magnetic saturation phenomenon is gradually intensified, and further, the width of the air gap is gradually increased there, so that the weakening effect of the magnetic saturation phenomenon can be ensured.
That is, the whole distance of the second section 1148 with changed air gap is limited, the changed air gap is limited in a range, and the change of the air gap is further rationalized, so that the air gap at the first section 1146 with unobvious magnetic saturation is ensured to have good air gap flux density while the magnetic saturation is reduced, and the output power of the motor 100 is ensured while the fluctuation of the torque is reduced.
In particular, the amount of the solvent to be used,
also, as shown in fig. 2, point a is the end point of the first segment 1146 that faces away from the second segment 1148, point B is the intersection between the first segment 1146 and the centerline of the stator teeth 114, point C is the connection point of the first segment 1146 and the second segment 1148, and point D is the end point of the second segment 1148 that faces away from the first segment 1146. Thus, the angle of the center of the circle occupied by the AB segmentIs composed of
Example 6:
as shown in fig. 2, in addition to any one of embodiments 1 to 5, further, the stator yoke 112 includes: a plurality of sequentially connected stator units 1122, the plurality of stator units 1122 being sequentially connected in an annular structure to form the stator yoke 112, wherein one stator tooth 114 is connected to any one of the plurality of stator units 1122.
Specifically, a region surrounded by a line connecting both ends of one stator unit 1122 to the center of the stator yoke 112 has one stator tooth 114 and stator slots of each half on both sides of the stator tooth 114.
In this embodiment, the stator yoke 112 has a plurality of stator units 1122, and one stator tooth 114 is connected to one stator unit 1122, thereby ensuring structural uniformity of the entire stator 110.
Example 7:
as shown in fig. 2, in addition to any one of embodiment 2 to embodiment 6, further, the stator teeth 114 are sectioned in a direction perpendicular to the axis of the stator yoke 112, and in the section, one stator unit 1122 occupies the stator yoke 112 at an angle of α s in the circumferential direction, the number of poles of the stator 110 is ps, the stator pole housing 1144 occupies the stator yoke 112 at an angle of β s in the circumferential direction,
β s ═ k α s, where 0.5 < k < 1. Specifically, the stator pole pieces 1144 occupy less angular center than one of the stator units 1122 due to the stator slot notches.
In this embodiment, the circumferential angle β s occupied by the stator pole shoe 1144 is limited to define the whole range of the air gap, so as to indirectly define the range of the second section 1148 of the air gap variation part, thereby reducing the magnetic saturation, ensuring that the air gap at the first section 1146 with insignificant magnetic saturation has good air gap flux density, and reducing the torque fluctuation, and ensuring the output power of the motor 100. And, thus, the length of the slot is limited, and the length of the slot can concern the loss of the motor 100, so that the loss of the motor 100 is limited in a better range, and the efficiency of the motor 100 is improved.
Example 8:
as shown in fig. 2, in addition to any one of embodiments 1 to 7, further, the second segment 1148 is a curved segment. Specifically, the second segment satisfies the quadratic function curve y of 0.0179 × x2。
Example 9:
in addition to any one of embodiments 1 to 8, further, the second segment 1148 is a straight line segment.
Example 10:
the invention provides a two-segment arc type stator 110, which comprises a stator pole shoe 1144, a stator tooth body 1142 and a stator yoke 112, wherein the stator 110 is matched with a rotor 120 to form a motor 100 structure. The stator pole shoe 1144 includes a stator back pole shoe 1162, a stator front pole shoe 1158, and a stator pole shoe 1144 center. The direction of the stator leading pole piece 1158 to the stator trailing pole piece 1162 is aligned with the direction of rotation of the rotor 120. The stator pole housing 1144 faces the rotor 120 in two arcuate segments, a first segment 1146, the AC segment, and a second segment 1148, the CD segment. The air gap between the first section 1146 and the rotor 120 is g, and the second section 1148, i.e., the CD section, gradually gets away from the rotor 120 to D from the point C. The distance between D and the extension section of the AC section is th2, the distance between D and the bottom of a front pole shoe 1158 of the stator is th1, the distance between A and a rear pole shoe 1162 of the stator is th, the distance between A and the rear pole shoe 1162 of the stator is more than or equal to th1+ th2, and th1/3< th2<2 g. The occupied circumferential angles of the AC segment and the CD segment are respectively beta s/2+ gamma 1 and gamma 2, and the gamma 1+ gamma 2 is beta s/2, and the gamma 2/gamma 1 is greater than 1/4. The motor 100 to which the stator 110 of the present embodiment is applied is a single-direction operation motor.
Further, the stator 110 includes a plurality of units, a circumferential angle α s corresponding to one unit is 2 pi/ps, ps is the number of poles of the stator 110, an angle β s corresponding to the stator pole shoe 1144 is k α s, and 1/2< k < 1.
Further, the direction of the stator leading pole piece 1158 to the stator trailing pole piece 1162 is aligned with the direction of rotation of the rotor 120.
Further, the stator pole housing 1144 faces the rotor 120 and is formed by a first section 1146, i.e., an AC section, and a second section 1148, i.e., a CD section, which are two arcs.
The first section 1146, i.e., the AC section, is a circular arc, and maintains the same air gap g as the rotor 120, and the second section 1148, i.e., the CD section, is a straight line or an arc, and gradually gets away from the rotor 120 to D from the point C.
The thickness of the front pole shoe 1158 of the stator is th1, the distance between D and the first section 1146, namely the extension section of the AC section is th1, and the thickness th of the back pole shoe 1162 of the stator meets th ≧ th1+ th2, th1/3< th2<2 g.
The circumferential angles occupied by the first section 1146, i.e., the AC section, and the second section 1148, i.e., the CD section, are β s/2+ γ 1 and γ 2, respectively, and γ 1+ γ 2 is β s/2, and γ 2/γ 1> 1/4.
The motor 100 to which the stator 110 of the present embodiment is applied is a single-direction operation motor.
In this embodiment, as shown in fig. 3, in the related art 1, the stator 110' includes a plurality of stator units, one unit corresponds to a circumferential angle α s of 2 pi/ps, and ps is a stator pole number, and in the related art 1, ps of 8 and α s of pi/4 are provided. The stator pole shoes correspond to an angle β s ═ k α s, 1/2< k <1, and k ═ 8/9 in related art 1. The stator pole shoe is in a symmetrical state about a central line, the structure of the stator pole shoe is symmetrical left and right, and the distances between the inner circle of the stator pole shoe and the outer circle of the rotor are equal. The stator pole shoe comprises a stator back pole shoe, a stator front pole shoe and a stator pole shoe center. The direction from the front pole shoe of the stator to the back pole shoe of the stator is consistent with the rotation direction of the rotor. Through simulation analysis, because the concentrated winding type motor rotates along with the rotor, the establishment of the winding current and the improvement of the air gap magnetic field are obviously saturated on the front pole shoe of the stator pole shoe, and the saturation phenomenon of the rear pole shoe of the stator pole shoe is relatively weak. Armature reaction further aggravates the distortion of the air-gap magnetic field, resulting in a larger harmonic content and significant torque ripple of the motor 100'.
The present invention is to eliminate the effect of saturation effect of the stator front pole piece 1158, as shown in fig. 1 and fig. 2, wherein the direction from the stator front pole piece 1158 to the stator back pole piece 1162 is shown to be consistent with the rotation direction of the rotor 120. Accordingly, as shown in fig. 4, stator leading pole piece 1158 is shown facing stator trailing pole piece 1162 in a direction opposite to the direction of rotation of rotor 120.
The stator pole housing 1144 of the present invention is formed with two segments of arcs, the first segment 1146 being the AC segment and the second segment 1148 being the CD segment. The air gap between the first section 1146, i.e. AC section, and the rotor 120 is g, the second section 1148, i.e. CD section, gradually gets away from the rotor 120 from point C to point D, and since point D gets away from the rotor 120, the air gap is increased, and the increase of the air gap increases the magnetic circuit voltage drop on the air gap side, the magnetic saturation of the stator front pole piece 1158 will be greatly reduced.
Further, to ensure that the magnetic voltage drop is reduced reasonably and prevent a large influence on the power output of the motor 100, the distance from the second segment 1148D to the intersection point Q of the extension line of the first segment 1146 and the extension line of the second side 1156 is defined as th2, the length of the second side 1156 is defined as th1, and the length of the first side 1154 is defined as th.
Such that th, th1 and th2 satisfy: th is more than or equal to th1+ th2,
and then realize the rational limited to the air gap of second section 1148 end point D department, to the width and the length of notch rationally limited, and then guarantee that the magnetic pressure drop reduces rationally, prevents to cause great influence to motor 100 power output to, further, after constituteing motor 100, the air gap width that first section 1146 department distributes is g, and then prescribes a limit to
th1＝th2＝1.4×g。
Further, the magnetic saturation at the first segment 1146 is maintained to a certain degree, so as to compensate the reduction of the output power of the motor 100 caused by the increase of the air gap at the first segment 1146, according to the simulation experiment, the invention limits th to be more than or equal to th1+ th2,
magnetic saturation at the magnetic saturation second section 1148 of the first section 1146 forms a better fit, so that the output power of the motor 100 is ensured while the harmonic content and torque fluctuation of the motor 100 are reduced.
Further, the circumferential angles occupied by the first section 1146, i.e., the AC section, and the second section 1148, i.e., the CD section, are β s/2+ γ 1 and γ 2, respectively, and in order to ensure the consistency of the total flux linkage on both sides of the stator pole shoe 1144, γ 1+ γ 2 is required to be equal to β s/2. The magnetic saturation is less obvious at the position of the stator front pole shoe 1158 close to the center of the stator pole shoe 1144 and the position closer to the point B, so that arc cutting is not needed, the saturation phenomenon is gradually enhanced when the position reaches the position C of the stator pole shoe 1144, the arc cutting can be gradually performed at the moment, in order to achieve a good arc cutting effect, the requirement that gamma 2/gamma 1 is greater than 1/4 is met, and further, the influence effect on the magnetic saturation is optimal when gamma 2/gamma 1 is 1.25.
Further, the first section 1146, i.e., the AC section, is a circular arc, and maintains the same air gap g as the rotor 120. The second section 1148, i.e., the CD section, is linear or arc-shaped, etc., and gradually moves away from the rotor 120 to D from point C. Specifically, a quadratic function curve y of 0.0179 × x about point C is used2The farther from point C, the larger the air gap after cutting.
Fig. 4 shows a related art 2, where the motor includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth, the stator yoke includes a plurality of stator units 1122 ', the stator teeth 114 ' include stator pole shoes 1144 ' and stator teeth 1142 ', a first section 1146 ' and a second section 1148 ' are disposed on a side of the stator pole shoes 1144 ' facing the rotor, the second section 1148 ' is gradually separated from the rotor from one end connected to the first section 1146 ' to the other end, and a rotation direction ω of the rotor is a reverse direction from the first section 1146 ' to the second section 1148 '.
The arc cutting mode in the direction opposite to the rotation direction of the rotor is adopted, and other parameters are completely consistent with the two-section arc structure of the embodiment.
Fig. 5 shows a related art 3, and the electric machine includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth 114 ', the stator yoke includes a plurality of stator units 1122', the stator teeth 114 'include a stator pole piece 1144' and a stator tooth body 1142 ', a first segment 1146', a second segment 1148 ', and a third segment 1170' are provided on a side of the stator pole piece 1144 'facing the rotor, the second segment 1148' and the third segment 1170 'are respectively located on both sides of the first segment 1146', the second segment 1148 'is gradually separated from the rotor from one end connected to the first segment 1146' to the other end, and the third segment 1170 'is gradually separated from the rotor from one end connected to the first segment 1146' to the other end.
The stator tooth with a three-segment arc structure is adopted, and the arc cutting mode of the related art 2 and the invention is combined, so that the structure with symmetry is constructed, and the structure comprises A 'B', B 'D' and D 'E' three-segment arcs.
As shown in fig. 6 and 7, compared with the related art 1, the output torque of the present invention is greatly improved, and both the output torque and the efficiency are much higher than those of the related art 2 and the related art 3 according to the data of the experiment performed by the present invention and the related art 1, the related art 2, and the related art 3.
The output power of this embodiment is much larger than that of related art 1, related art 2, and related art 3, the saturation effect of the stator pole shoe 1144 is eliminated, the torque ripple coefficient is greatly reduced compared to related art 1, and the torque ripple coefficient is increased and the output power is reduced by related art 2 using the arc cutting method opposite to this embodiment. Therefore, the present embodiment is applied to the motor 100 with unidirectional operation, and the relationship of the present embodiment is maintained with the rotor rotation direction, and the effects of improving the saturation condition of the magnetic density of the stator pole shoe, increasing the output torque and the output power, improving the motor efficiency and reducing the torque fluctuation can be achieved.
Example 11:
according to a second aspect of the invention, the invention provides an electrical machine 100 comprising: the stator 110 provided in any of the above embodiments; and a rotor 120 disposed at an inner ring of the stator yoke 112, wherein a rotation direction of the rotor 120 is a direction from the second section 1148 to the first section 1146.
The motor 100 provided by the present invention includes the stator 110 provided in any of the above embodiments, so that all the advantages of the motor 100 provided in any of the above embodiments are provided, and thus, no description is given here.
A comparative experiment was performed using the motor 100 according to an embodiment of the present invention and the motors according to related art 1, related art 2, and related art 3.
Specifically, as shown in fig. 3, in related art 1, motor 100 ' includes a stator 110 ' and a rotor, stator 110 ' includes a stator yoke 112 ' and a plurality of stator teeth 114 ', a side of stator teeth 114 ' facing the rotor is an arc concentric with the rotor, an air gap between stator 110 ' and the rotor is g ', a width of a stator pole shoe in stator teeth 114 ' at a stator slot is th ', a circle center angle occupied by a stator unit is α s ', a circle center angle occupied by a stator pole shoe is β s ', and the other parameters are the same except that a side of stator teeth 114 ' facing the rotor is different from those of the present invention.
The stator 110 'includes a plurality of stator units, where one unit corresponds to a circumferential angle α s' of 2 pi/ps ', and ps' is a stator pole number, and in the related art 1, ps 'is 8, and α s' is pi/4. The stator pole shoe corresponds to an angle β s ═ α s ', 1/2< k' <1, and in the related art 1, k ═ 8/9. The stator pole shoe is in a symmetrical state about a central line, the structure of the stator pole shoe is symmetrical left and right, and the distances between the inner circle of the stator pole shoe and the outer circle of the rotor are equal. The stator pole shoe comprises a stator back pole shoe, a stator front pole shoe and a stator pole shoe center. The direction from the front pole shoe of the stator to the back pole shoe of the stator is consistent with the rotation direction of the rotor. Through simulation analysis, because the concentrated winding type motor rotates along with the rotor, the establishment of the winding current and the improvement of the air gap magnetic field are obviously saturated on the front pole shoe of the stator pole shoe, and the saturation phenomenon of the rear pole shoe of the stator pole shoe is relatively weak. Armature reaction further aggravates the distortion of the air-gap magnetic field, resulting in a larger harmonic content and significant torque ripple of the motor 100'.
Fig. 4 shows a related art 2, where the motor includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth, the stator yoke includes a plurality of stator units 1122 ', the stator teeth 114 ' include stator pole shoes 1144 ' and stator teeth 1142 ', a first section 1146 ' and a second section 1148 ' are disposed on a side of the stator pole shoes 1144 ' facing the rotor, the second section 1148 ' is gradually separated from the rotor from one end connected to the first section 1146 ' to the other end, and a rotation direction ω of the rotor is a reverse direction from the first section 1146 ' to the second section 1148 '.
The arc cutting mode opposite to the rotor selection and installation direction is adopted, and other parameters are completely consistent with the two-section arc structure of the embodiment.
Fig. 5 shows a related art 3, and the electric machine includes a stator and a rotor, the stator includes a stator yoke and a plurality of stator teeth 114 ', the stator yoke includes a plurality of stator units 1122', the stator teeth 114 'include a stator pole piece 1144' and a stator tooth body 1142 ', a first segment 1146', a second segment 1148 ', and a third segment 1170' are provided on a side of the stator pole piece 1144 'facing the rotor, the second segment 1148' and the third segment 1170 'are respectively located on both sides of the first segment 1146', the second segment 1148 'is gradually separated from the rotor from one end connected to the first segment 1146' to the other end, and the third segment 1170 'is gradually separated from the rotor from one end connected to the first segment 1146' to the other end.
The stator tooth with a three-segment arc structure is adopted, and the arc cutting mode of the related art 2 and the invention is combined, so that the structure with symmetry is constructed, and the structure comprises A 'B', B 'D' and D 'E' three-segment arcs.
As shown in fig. 6, the present invention provides a motor 100 in which both the output torque and the efficiency of the motor are in a better state than those of related art 1, related art 2, and related art 3.
As shown in fig. 7, the present invention provides a motor 100 in which the torque ripple factor of the motor and the output power of the motor are in a better state than those of related art 1, related art 2, and related art 3.
Example 12:
in addition to embodiment 10, further, in the case that the width between the first section 1146 which is a circular arc section, the second end 1152 of the second section 1148 of the stator 110, and the intersection point Q between the extension line of the first section 1146 of the stator 110 and the extension line of the second side 1156 of the stator 110 is th2, th2 is smaller than 2 times the width g of the air gap formed between the rotor 120 and the first section 1146 of the stator 110.
Namely th2<2 g.
In this embodiment, the magnetic saturation at the first section 1146 is maintained to a certain degree, so as to compensate for the decrease in the output power of the motor caused by the increase of the air gap at the first section 1146, according to the simulation experiment, the present invention limits th2 to less than 2g, and further combines the structure of the stator 110 to form a better fit for the magnetic saturation at the magnetically saturated second section 1148 of the first section 1146, thereby ensuring the output power of the motor 100 while reducing the harmonic content and torque fluctuation of the motor 100.
Example 13:
according to a third aspect of the present invention, there is provided a compressor comprising: the stator 110 provided in any of the above embodiments; or the motor 100 provided in any of the embodiments described above.
The compressor provided by the present invention, including the stator 110 provided in any of the above embodiments, has all the advantages of the motor 100 provided in any of the above embodiments, and therefore, no further description is given here.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A stator, comprising:
a stator yoke having an annular configuration;
a plurality of stator teeth provided to an inner ring of the stator yoke,
the stator tooth is sectioned in a direction perpendicular to the axis of the stator yoke, in the section, the contour line of one side, away from the stator yoke, of the stator tooth comprises a first section and a second section which are connected, the second section comprises a first end and a second end, the first end is connected with the first section, the second end is away from the first section, and the second section is gradually far away from the center of the stator yoke from the first end to the second end.
2. The stator of claim 1, wherein the stator teeth comprise:
the stator tooth body is arranged on the inner ring of the stator yoke;
the stator pole shoe is arranged at one end, deviating from the stator yoke, of the stator tooth body, and the first section and the second section are arranged on one side, deviating from the stator tooth body, of the stator pole shoe.
3. The stator according to claim 2,
the first section is arc-shaped, and the first section and the stator yoke are concentric.
4. The stator of claim 3, wherein the stator pole shoe further comprises:
the first side edge is connected with the first section and is positioned on one side of the first section, which is far away from the second section;
a second side edge connected with the second section and located on a side of the second section facing away from the first section,
wherein, with the perpendicular to the direction of the axis of stator yoke is right the stator tooth carries out the cross-section, in the cross-section, the length of first side is th, the length of second side is th1, the extension line of first section with the intersect of second side extension line is D point, the length that second end to D point is th2,
th≥th1+th2，
5. the stator according to any one of claims 2 to 4,
the stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, in section the stator pole shoes occupy the stator yoke at a circumferential angle β s, and the first segment occupies the stator yoke at a circumferential angle β s
The second segment occupies the stator yoke at an angle gamma2，
Wherein,
6. the stator according to any one of claims 2 to 4, wherein the stator yoke comprises:
a plurality of stator units sequentially connected in an annular structure to form the stator yoke,
wherein one stator tooth is connected to any one of the plurality of stator units.
7. The stator according to claim 6,
the stator teeth are sectioned in a direction perpendicular to the axis of the stator yoke, in section, one stator unit occupies the stator yoke at a circumferential angle of as, the number of poles of the stator is ps, the stator pole shoes occupy the stator yoke at a circumferential angle of ss,
wherein k is more than 0.5 and less than 1.
8. The stator according to any one of claims 1 to 4,
the second section is a curved section or a straight section.
9. An electric machine, comprising:
the stator of any one of claims 1 to 8;
and the rotor is arranged on the inner ring of the stator yoke, and the rotation direction of the rotor is the direction from the second section to the first section.
10. The electric machine of claim 9,
the first section is the circular arc section, the second end of the second section of stator arrives the extension line of the first section of stator with under the condition that width between the nodical of the second side extension line of stator is th2, th2 is less than 2 times the rotor with the width of the air gap that forms between the first section of stator.
11. A compressor, comprising:
the stator of any one of claims 1 to 8; or
An electrical machine as claimed in claim 9 or 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011211225.3A CN112271836A (en) | 2020-11-03 | 2020-11-03 | Stator, Motor and Compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011211225.3A CN112271836A (en) | 2020-11-03 | 2020-11-03 | Stator, Motor and Compressor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112865351A (en) * | 2021-03-09 | 2021-05-28 | 佛山市威灵洗涤电机制造有限公司 | Stator punching sheet, stator core, motor, compressor and refrigeration equipment |
| CN113839476A (en) * | 2021-09-18 | 2021-12-24 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
| TWI770903B (en) * | 2021-03-26 | 2022-07-11 | 東元電機股份有限公司 | Stator tooth with stator tooth cut arc structure |
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| JP2017135766A (en) * | 2016-01-25 | 2017-08-03 | 三菱電機株式会社 | Single-phase brushless motor and manufacturing method of single-phase brushless motor |
| CN213243654U (en) * | 2020-11-03 | 2021-05-18 | 美的威灵电机技术（上海）有限公司 | Stator, motor and compressor |
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| CN106169852A (en) * | 2015-05-21 | 2016-11-30 | 德昌电机(深圳)有限公司 | Brushless single phase motor and electric tool |
| JP2017135766A (en) * | 2016-01-25 | 2017-08-03 | 三菱電機株式会社 | Single-phase brushless motor and manufacturing method of single-phase brushless motor |
| CN213243654U (en) * | 2020-11-03 | 2021-05-18 | 美的威灵电机技术（上海）有限公司 | Stator, motor and compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112865351A (en) * | 2021-03-09 | 2021-05-28 | 佛山市威灵洗涤电机制造有限公司 | Stator punching sheet, stator core, motor, compressor and refrigeration equipment |
| TWI770903B (en) * | 2021-03-26 | 2022-07-11 | 東元電機股份有限公司 | Stator tooth with stator tooth cut arc structure |
| CN113839476A (en) * | 2021-09-18 | 2021-12-24 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
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