CN113036956A - Stator tooth punching sheet, motor stator and motor - Google Patents
Stator tooth punching sheet, motor stator and motor Download PDFInfo
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- CN113036956A CN113036956A CN201911355217.3A CN201911355217A CN113036956A CN 113036956 A CN113036956 A CN 113036956A CN 201911355217 A CN201911355217 A CN 201911355217A CN 113036956 A CN113036956 A CN 113036956A
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- stator
- tooth
- punching sheet
- motor
- gap
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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
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a stator tooth punching sheet, a motor stator and a motor. Stator tooth is towards piece including tooth claw portion, tooth waist and the root of tooth that connects gradually along length direction, and tooth claw portion has the gap, and the gap is along length direction sunken setting, and the gap runs through two sides of tooth claw portion along thickness direction, and tooth waist portion has the trompil, and the trompil runs through two sides of tooth waist along thickness direction. According to the stator tooth punching sheet, the gap is arranged on the tooth end face of the tooth claw part, and the hole is arranged on the tooth waist part, so that a current loop generated by the rotor magnetic field of a motor rotor induced on the surface of the stator tooth punching sheet can be isolated for a motor adopting a stator punching sheet type structure, the size of induced current can be reduced, and the loss of an iron core can be reduced; on the other hand, the stator teeth are formed in the form of the stator tooth punching sheets, and then the stator core structure is formed by combining the stator yoke part structure, so that the process is simpler, and the cost is lower.
Description
Technical Field
The invention relates to the field of motors, in particular to a stator tooth punching sheet, a motor stator and a motor.
Background
For motors such as a transverse flux motor, a claw motor and the like, based on the realizability of process and performance, the stacking direction of stator punching sheets of a motor stator is the same as the rotating direction of a rotor, and by adopting the stacking mode, the iron core loss including eddy current loss and hysteresis loss generated by the induction of a rotor magnetic field penetrating into the motor stator vertically can be effectively reduced, however, due to the rotation of the motor rotor, the rotor magnetic field does not penetrate into the stator punching sheets vertically, but the included angle between the rotor magnetic field and the rotating direction of the motor rotor is smaller than 90 degrees, namely, the rotor magnetic field has not only a vertical component but also a parallel component relative to the stacking direction of the stator punching sheets, so that the following defects are caused:
(1) because the parallel component is perpendicular to the stator punching sheet, the iron core loss is generated in the motor stator.
(2) When the motor running frequency is higher, the loss of the iron core is larger, and the performance of the motor is influenced.
Disclosure of Invention
The application provides a stator tooth is towards piece, stator tooth is towards piece has simple structure, the little advantage of loss.
Another object of the present invention is to provide a motor stator, which has the stator teeth punching sheet as described above.
It is a further object of the present invention to provide an electric machine having a motor stator as described above.
The stator tooth punching sheet comprises a tooth claw part, a tooth waist part and a tooth root part which are sequentially connected along the length direction, wherein the tooth claw part is provided with a gap which is arranged along the length direction in a concave mode, the gap penetrates through two side faces of the tooth claw part along the thickness direction, the tooth root part is provided with a fixing groove, the tooth waist part is provided with an opening, and the opening penetrates through the two side faces of the tooth waist part along the thickness direction.
According to the stator tooth punching sheet provided by the embodiment of the invention, the gap is formed on the tooth end surface of the tooth claw part, and the opening is formed in the tooth waist part, so that on one hand, aiming at a motor adopting a stator punching sheet type structure, a current loop generated by a rotor magnetic field of a motor rotor induced on the surface of the stator tooth punching sheet can be cut off, and the size of induced current can be reduced, so that the loss of an iron core can be reduced, further, when the running frequency of the motor is higher, the loss of the iron core can be reduced by forming the gap, and the performance of the motor can be improved; on the other hand, the stator teeth are formed in the form of the stator tooth punching sheets, and then the stator yoke portion is combined to form the stator core structure, so that compared with a motor which adopts stator teeth partially or completely made of metallurgical materials, the stator core structure is simpler in process and lower in cost.
In some embodiments, the aperture is a plurality of apertures, the plurality of apertures being spaced apart along the length direction.
In some embodiments, the aperture extends along the length direction.
In some embodiments, an orthographic projection of the aperture on the lumbar surface is oblong.
In some embodiments, at least one end of the oblong shape in the length direction is arcuate.
In some embodiments, the arc has a diameter of 0.5-1.5 mm.
In some embodiments, the waisted portion has a first axis of symmetry extending in the lengthwise direction, the waisted portion is symmetrical about the first axis of symmetry, and the aperture is disposed on the first axis of symmetry.
In some embodiments, the slits are plural, and the slits are spaced apart in a width direction of the claw portion.
In some embodiments, the pawl has a second axis of symmetry extending lengthwise, and the plurality of slits are symmetrically distributed about the second axis of symmetry.
In some embodiments, the depth of the slit in the length direction gradually decreases in a direction from the second symmetry axis to an end in the width direction of the claw portion.
In some embodiments, the depth of the gap in the middle of the width direction of the claw part is 2-3 mm; the depth of the slit at the extreme end in the width direction of the claw part is 0.5-2 mm.
The motor stator according to the embodiment of the invention comprises: the stator tooth punching sheet is the stator tooth punching sheet; annular stator yoke portion, wherein, a plurality of stator tooth lamination forms the stator tooth along axial stack structure, the fixed slot is along circumference joint in on the stator yoke portion.
According to the motor stator disclosed by the embodiment of the invention, the gap is formed on the tooth end surface of the tooth claw part, and the opening is formed in the tooth waist part, so that on one hand, for a motor adopting a stator punching sheet type structure, a current loop generated by a rotor magnetic field of a motor rotor induced on the surface of a stator tooth punching sheet can be cut off, and the size of induced current can be reduced, so that the loss of an iron core can be reduced, further, when the running frequency of the motor is higher, the loss of the iron core can be reduced by forming the gap, and the performance of the motor can be improved; on the other hand, the stator teeth are formed in the form of the stator tooth punching sheets, and then the stator yoke portion is combined to form the stator core structure, so that compared with a motor which adopts stator teeth partially or completely made of metallurgical materials, the stator core structure is simpler in process and lower in cost.
According to an embodiment of the present invention, a motor includes: the motor stator is the motor stator described above; and the motor rotor is sleeved and assembled with the motor stator, wherein the motor stator is an outer stator or an inner stator.
According to the motor provided by the embodiment of the invention, the gap is formed on the tooth end surface of the tooth claw part, and the opening is formed in the tooth waist part, so that on one hand, aiming at the motor adopting a stator punching sheet type structure, a current loop generated by the rotor magnetic field of a motor rotor induced on the surface of the stator tooth punching sheet can be cut off, and the size of induced current can be reduced, so that the loss of an iron core can be reduced, further, when the running frequency of the motor is higher, the loss of the iron core can be reduced by forming the gap, and the performance of the motor can be improved; on the other hand, the stator teeth are formed in the form of the stator tooth punching sheets, and then the stator yoke portion is combined to form the stator core structure, so that compared with a motor which adopts stator teeth partially or completely made of metallurgical materials, the stator core structure is simpler in process and lower in cost.
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 stator tooth punching sheet according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a stator tooth punching sheet according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a stator tooth punching sheet according to an embodiment of the invention;
fig. 4 is a schematic structural view of a stator of a motor according to an embodiment of the present invention.
Reference numerals:
a stator tooth punching sheet 10 is provided,
the length of the jaw portion 102, the gap 1022,
the lumbar portion 104, the bore 1042, the first axis of symmetry 1043, the second axis of symmetry 1044,
the tooth root 106, the seating groove 1062, the first sidewall 1064, the second sidewall 1066,
a stator yoke 20.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1 to 3, a stator tooth punching sheet 10 according to an embodiment of the present invention includes a tooth claw portion 102, a tooth waist portion 104, and a tooth root portion 106, which are sequentially connected in a length direction.
Specifically, the longitudinal direction of the stator lamination 10 may be understood as the up-down direction as shown in fig. 2, that is, the claw portion 102, the waist portion 104, and the root portion 106 are connected in sequence from bottom to top. As shown in fig. 2, the claw portion 102 has a slit 1022, and the slit 1022 is recessed in the longitudinal direction. It can be understood that the depth direction of the gap 1022 is the same as the length direction of the stator tooth punching sheet 10.
As shown in fig. 1 and 2, the slit 1022 passes through both side surfaces of the claw portion 102 in the thickness direction, and the root portion 106 has a fixing groove 1062. As shown in fig. 1 to 3, the tooth waist portion 104 has holes 1042, the holes 1042 penetrating through both side surfaces of the tooth waist portion 104 in the thickness direction. A plurality of stator tooth punching sheets 10 stacked in the thickness direction can be configured to form a stator tooth.
In this embodiment, the stator core may be formed by an annular stator yoke 20 and a plurality of stator teeth clamped on the stator yoke 20, wherein each stator tooth is formed by laminating a plurality of stator teeth 10, each stator tooth may include a tooth root portion 106, a tooth waist portion 104 and a tooth claw portion 102, the tooth root portion 106 is used for being connected with the stator yoke 20, the tooth waist portion 104 may be wound, and the tooth claw portion 102 may be arranged in a circumferential direction to form a circumferential mating surface for mating with a motor rotor and generate a magnetic gap with the motor rotor.
According to the stator tooth punching sheet 10 provided by the embodiment of the invention, the gap 1022 is formed on the tooth end surface of the tooth claw part 102, and the opening 1042 is formed in the tooth waist part 104, so that on one hand, for a motor adopting a stator punching sheet type structure, a current loop generated by a rotor magnetic field of a motor rotor induced on the surface of the stator tooth punching sheet 10 can be cut off, and the magnitude of induced current can be reduced, so that the loss of an iron core can be reduced, further, when the running frequency of the motor is higher, the loss of the iron core can be reduced by forming the gap 1022, so that the performance of the motor can be improved; on the other hand, the stator teeth are formed in the form of the stator tooth punching sheets 10, and then the stator yoke portion 20 is combined to form a stator core structure, so that compared with a motor which adopts stator teeth partially or completely made of metallurgical materials, the stator core structure is simpler in process and lower in cost.
As can be understood by those skilled in the art, the core loss is power loss caused by the presence of an alternating or pulsating magnetic field and is expressed in the form of heat, that is, electric energy is converted into heat energy to be diffused to generate loss, specifically, by forming the gap 1022 and the opening 1042, the length of the air gap between the motor stator and the motor rotor can be increased in a local area, and higher harmonics in the air gap flux density can also be reduced, so that the purposes of improving the motor operating efficiency and reducing the core loss are achieved.
According to some embodiments of the present invention, as shown in fig. 2 and 3, as a structure manner of the stator tooth punching sheet 10, the tooth root portion 106 may be configured as a rectangular structure, the tooth waist portion 104 may be configured as a long strip structure, and the tooth claw portion 102 may be configured as a triangular structure.
In the above embodiment, the fixing groove 1062 is formed on the side surface of the tooth root portion 106, the fixing groove 1062 is recessed along the width direction and penetrates through two side surfaces of the tooth root portion 106 along the thickness direction, wherein a plurality of stator teeth can be snap-fitted with the annular stator yoke portion 20 through the fixing groove 1062 to form a motor stator, and the tooth end surface can be circumferentially surrounded to form an outer circular fitting surface or an inner circular fitting surface fitted with a motor rotor.
As shown in fig. 1 and 4, in this embodiment, the fixing groove 1062 is formed in the tooth root 106 in the width direction, after the stator teeth are formed by stacking the stator tooth stamped pieces 10, the fixing groove 1062 is engaged with the annular stator yoke 20 to fix the stator teeth to the stator yoke 20, so that the assembly method is simple while ensuring reliability, and in addition, the groove walls on both sides of the fixing groove 1062 can realize a magnetic conduction function while being attached to and fixed to the stator yoke 20, and after the winding wound around the stator teeth is energized, the magnetic force lines closed in the stroke are conducted through the stator teeth to drive the motor rotor to rotate.
In any of the above embodiments, the sectional shape of the fixing groove 1062 is configured as any one of a rectangle, a U-shape, and a trapezoid.
In this embodiment, the cross-section of the fixing groove 1062 may be changed by the structural form and as the cross-sectional shape of the stator yoke 20 is changed.
Preferably, the fixing groove 1062 has a rectangular or trapezoidal sectional shape
In any of the above embodiments, the length of the fixing groove 1062 away from the second sidewall 1066 of the tooth waist portion 104 is less than the length of the first sidewall 1064 near the tooth waist portion 104.
In this embodiment, the second side wall 1066 far from the tooth waist 104 is mainly used for cooperating with the stator yoke 20 and achieving mechanical fixation, and at this time, the length of the second side wall 1066 may be less than or equal to the length of the first side wall 1064 near the tooth waist 104, and when the length of the second side wall 1066 is further reduced to set the length of the side wall to be less than the length of the first side wall 1064, the mass of the entire motor stator can be effectively reduced.
Meanwhile, for the first side wall 1064 close to the tooth waist portion 104, while the fixing groove 1062 is formed in cooperation with the second side wall 1066 to achieve mechanical fixing with the stator yoke 20, magnetic lines of force transmitted from the tooth waist portion 104 can be transmitted into the stator yoke, so that by setting the side wall close to the tooth waist portion 104 to be a longer side, the magnetic flux leakage probability can be effectively reduced.
As shown in fig. 1 to 4, in any of the above embodiments, the thickness of the sidewall (the second sidewall 1066) of the fixing groove 1062 remote from the tooth waist portion 104 is smaller than the thickness of the sidewall (the first sidewall 1064) near the tooth waist portion 104.
In this embodiment, by setting the thickness of the second side wall 1066 to be less than or equal to the thickness close to the first side wall 1064, on one hand, by defining the thickness of the first side wall 1064, magnetic flux lines transmitted from the tooth waist 104 are ensured to be transmitted to the stator yoke 20, and at the same time, the magnetic flux leakage probability is favorably reduced, and on the other hand, by defining the thickness of the second side wall 1066, while the strength of the mechanical fixation is satisfied, the weight of the motor stator is favorably reduced.
In any of the above embodiments, the outer side surface of the tooth root portion 106 opposite to the groove bottom of the fixing groove 1062 is flush with one side surface of the waist portion 104.
The side surface of the tooth root 106 where the fixing groove 1062 is formed is flush with the other side surface of the waist portion 104.
In this embodiment, the tooth root 106 and the tooth waist 104 have different relative positional relationships, and further the adjustment of the width dimension of the tooth root 106 can be realized, wherein, as one relative positional relationship, the outer side surface of the tooth root 106 opposite to the groove bottom of the fixing groove 1062 is flush with the side surface of one side of the tooth waist 104, and as the other relative positional relationship, the side surface of the opening side of the fixing groove 1062 is flush with the side surface of the tooth waist 104, and on the basis of ensuring the clamping connection between the stator teeth and the stator yoke 20, the overall weight reduction of the motor stator can be realized by reducing the width of the tooth root 106.
In addition, in connection with the above description in which the sectional shape of the fixing groove 1062 is configured as any one of a rectangle, a U shape, and a trapezoid, it is also possible to set only the side wall of the fixing groove 1062 near the tooth waist portion 104 to be the same as the width of the tooth waist portion 104, and to form the sectional configuration of the fixing groove 1062 into a different shape by changing the length of the side wall on the side away from the tooth waist portion 104.
As shown in fig. 3, in any of the above embodiments, a chamfer 1068 is provided at a vertex of an outer contour line of the seating groove 1062 to configure both side walls of the seating groove 1062 in a trapezoidal structure or a triangular structure.
In this embodiment, since the magnetic leakage phenomenon generally occurs at the top corner of the outer contour line of the fixing groove, the magnetic leakage probability is reduced by providing the top corner with the chamfer 1068.
Those skilled in the art can understand that the tooth end face can be circumferentially surrounded to form an outer circle matching surface or an inner circle matching surface matched with the motor rotor, that is, by using the stator tooth punching sheet 10 in the present application, stator teeth matched with the outer rotor can be formed, and stator teeth matched with the inner rotor can also be formed.
Wherein, the thickness direction of the stator tooth is consistent with the circumference.
In any of the above embodiments, the claw portion 102 is formed by two flank surfaces extending obliquely outward along the waistline portion 104, respectively, and a tooth end surface provided between the two flank surfaces.
In this embodiment, by configuring the claw portion 102 to have a triangular structure formed by two tooth flanks extending obliquely outward along the tooth waist portion 104 and a tooth end face disposed between the two tooth flanks, the claw portion 102 (i.e., the tooth shoe portion) formed by the two tooth flanks extending outward respectively is configured to have a larger tooth shoe portion, so that the magnetic flux collection efficiency can be improved, the winding stability can be ensured, and the motor operation performance can be ensured.
The two tooth side portions arranged oppositely can extend outwards along the width direction and can also extend outwards along the thickness direction.
As shown in fig. 2, according to some embodiments of the invention, the opening 1042 may be a plurality of openings 1042 spaced apart along the length direction, each opening 1042 extending along the length direction. Further, as shown in fig. 2, the orthographic projection of the aperture 1042 on the surface of the waist portion 104 is oblong. Therefore, the current loop generated by the induction of the rotor magnetic field of the motor rotor on the surface of the stator tooth punching sheet 10 can be more favorably cut off, the magnitude of the induced current is reduced, and the loss of the iron core can be reduced.
Furthermore, as shown in fig. 2 and 3, at least one end of the oblong shape is arc-shaped in the length direction, and the diameter of the arc-shaped is 0.5-1.5 mm. On the one hand, be favorable to processing the oblong hole, on the other hand can also be in the length of the air gap between local area increase motor stator and the electric motor rotor, is favorable to reducing the higher harmonic in the air gap flux density to reach the purpose that improves motor operating efficiency, reduce the iron core loss.
According to some embodiments of the present invention, as shown in fig. 2, the lumbar portion 104 has a first axis of symmetry 1043 extending in the length direction, the lumbar portion 104 is symmetrical about the first axis of symmetry 1043, and the aperture 1042 is disposed on the first axis of symmetry 1043. Further, each bore 1042 may also be symmetric about a first axis of symmetry 1043.
According to some embodiments of the present invention, the gap 1022 may be plural, and the plural gaps 1022 are spaced apart in the width direction of the claw portion 102. It will also be understood by those skilled in the art that the longitudinal direction defined in the present application is the longitudinal direction of the waist portion 104, and the width direction defined in the present application is the direction perpendicular to the longitudinal direction and the thickness direction, respectively, i.e., the horizontal direction of the root portion 106 of the rectangular structure. For example, the left-right direction as shown in fig. 2 may be understood as a width direction of the claw portion 102.
When a plurality of slits 1022 are provided, the plurality of slits 1022 are distributed along the width direction, and may be uniformly distributed or non-uniformly distributed, and the depth of the slits 1022 depends on the level of the core loss at that position, which can be calculated by simulation, and the smaller the width of the slits 1022 is, the better, so as to reduce the core loss without causing performance degradation of the motor.
In some embodiments, as shown in fig. 2, the claw portion 102 has a second axis of symmetry 1044 extending in the length direction, and the plurality of slits 1022 are distributed symmetrically about the second axis of symmetry 1044. Here, the second axis of symmetry 1044 may be collinear with the first axis of symmetry 1043.
As shown in fig. 2, the depth of the slit 1022 in the length direction gradually decreases in the direction from the second symmetry axis 1044 to the end portion of the claw portion 102 in the width direction. For example, as shown in fig. 2, in the direction from the second symmetry axis 1044 to the left end of the claw portion 102, the depth of the gap 1022 in the up-down direction gradually decreases; accordingly, the depth of the slit 1022 in the up-down direction gradually decreases from the second symmetry axis 1044 to the right end direction of the claw portion 102. In some embodiments, the depth of the gap 1022 located at the widthwise middle of the jaw portion 102 is 2-3 mm; the depth of the slit 1022 located at the extreme end in the width direction of the claw portion 102 is 0.5 to 2 mm.
In any of the above embodiments, the cross-sectional shape of the slits 1022 is configured as a combination of one or more of a rectangle, a trapezoid, a U-shape, a V-shape, and a semicircle.
Preferably, the cross-sectional shape of the slits 1022 is rectangular or U-shaped, which is simpler to manufacture.
As shown in fig. 1 and 3, in any of the above embodiments, the inner side walls of the gaps 1022 are respectively disposed perpendicularly to the tooth end surfaces. In any of the embodiments described above, at least one of the inner side walls of the gap 1022 is disposed obliquely to the tooth end face, as shown in fig. 4.
In this embodiment, the opposite tooth end surfaces of the gap 1022 may or may not be vertically arranged, and the included angle between the tooth end surfaces and the gap may be adjusted according to the matching manner with the motor rotor.
In any of the above embodiments, the two obliquely extending tooth flanks are arranged symmetrically with respect to the tooth waist 104 to configure the stator teeth in a centrosymmetric structure; when the slits 1022 have a plurality of slits 1022, the plurality of slits 1022 are uniformly distributed in the width direction.
In any of the above embodiments, the gap 1022 can be filled with a non-magnetic material. In this embodiment, by filling the gap 1022 with a nonmagnetic material, it is possible to contribute to an increase in rigidity of the claw portion 102 as compared with the gap 1022 having a hollow structure.
As shown in fig. 4, a stator of an electric machine according to an embodiment of the present invention includes: the stator tooth punching sheet 10 according to any one of the embodiments; the stator comprises an annular stator yoke portion 20, wherein a plurality of stator tooth punching sheets 10 are stacked axially to form stator teeth, and the plurality of stator teeth are clamped on the stator yoke portion 20 along the circumferential direction.
In this embodiment, the stator teeth punching sheet 10 forms stator teeth by stacking, a plurality of stator teeth are clamped on the annular stator yoke portion 20 along the circumferential direction to form a motor stator, the circumferential matching surface formed by the teeth claw portion 102 circumferentially surrounding is matched with a motor rotor, and the effect of reducing the core loss is achieved by forming the gap 1022.
An electric machine according to an embodiment of the invention comprises: the motor stator according to the above embodiment; and the motor rotor is sleeved and assembled with the motor stator, wherein the motor stator is an outer stator or an inner stator.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "left," "right," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for ease of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (13)
1. The utility model provides a stator tooth is towards piece, its characterized in that includes tooth claw portion, tooth waist and the root of tooth that connects gradually along length direction, tooth claw portion has the gap, the gap is followed length direction sets up in cave-in, the gap link up along thickness direction two sides of tooth claw portion, the root of tooth has the fixed slot, the tooth waist has the trompil, the trompil link up along thickness direction two sides of tooth waist.
2. The stator tooth punching sheet according to claim 1, wherein the opening is multiple, and the multiple openings are spaced apart along the length direction.
3. The stator tooth punching sheet according to claim 1, wherein the opening extends along the length direction.
4. The stator tooth punching sheet according to claim 3, wherein an orthographic projection of the opening on the surface of the tooth waist portion is oblong.
5. The stator tooth punching sheet according to claim 4, wherein at least one end of the oblong circle is arc-shaped in the length direction.
6. The stator tooth punching sheet according to claim 5, wherein the diameter of the arc is 0.5-1.5 mm.
7. The stator tooth punching sheet according to claim 1, wherein the tooth waist portion has a first axis of symmetry extending in the length direction, the tooth waist portion is symmetrical about the first axis of symmetry, and the opening is provided on the first axis of symmetry.
8. The stator tooth punching sheet according to claim 1, wherein the plurality of slits are spaced apart in a width direction of the claw portion.
9. The stator tooth punching sheet according to claim 8, wherein the claw portion has a second symmetry axis extending along the length direction, and the plurality of slits are symmetrically distributed about the second symmetry axis.
10. The stator tooth punching sheet according to claim 9, wherein the depth of the gap in the length direction is gradually reduced in a direction from the second symmetry axis to an end of the claw portion in the width direction.
11. The stator tooth punching sheet according to claim 10, wherein the depth of the gap in the middle of the tooth claw part in the width direction is 2-3 mm;
the depth of the slit at the extreme end in the width direction of the claw part is 0.5-2 mm.
12. An electric machine stator, comprising:
the stator tooth punching sheet is the stator tooth punching sheet according to any one of claims 1 to 11;
a stator yoke part in the shape of a ring,
the stator tooth punching sheets are axially overlapped to form stator teeth, and the fixing grooves are circumferentially clamped on the stator yoke portion.
13. An electric machine, comprising:
a motor stator according to claim 12;
a motor rotor sleeved with the motor stator,
the motor stator is an outer stator or an inner stator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355217.3A CN113036956A (en) | 2019-12-25 | 2019-12-25 | Stator tooth punching sheet, motor stator and motor |
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| CN201911355217.3A CN113036956A (en) | 2019-12-25 | 2019-12-25 | Stator tooth punching sheet, motor stator and motor |
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Application publication date: 20210625 |