CN112350464A - Stator core, stator and motor - Google Patents

Stator core, stator and motor Download PDF

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Publication number
CN112350464A
CN112350464A CN201910720463.8A CN201910720463A CN112350464A CN 112350464 A CN112350464 A CN 112350464A CN 201910720463 A CN201910720463 A CN 201910720463A CN 112350464 A CN112350464 A CN 112350464A
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CN
China
Prior art keywords
stator core
stator
motor
magnetic steel
tooth
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Application number
CN201910720463.8A
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Chinese (zh)
Inventor
李金箫
孙爱兵
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Midea Group Co Ltd
Jiangsu Midea Cleaning Appliances Co Ltd
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Midea Group Co Ltd
Jiangsu Midea Cleaning Appliances Co Ltd
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Priority to CN201910720463.8A priority Critical patent/CN112350464A/en
Publication of CN112350464A publication Critical patent/CN112350464A/en
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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
    • 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
    • H02K1/148—Sectional cores
    • 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
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • 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 core, a stator and a motor, wherein the stator core comprises an annular yoke part and three tooth parts arranged in an inner ring of the yoke part, the inner ring of the yoke part comprises three straight line sections which are uniformly distributed along the circumferential direction of the yoke part on the cross section of the stator core, each straight line section comprises a first subsection and two second subsections positioned on two sides of the first subsection, the three tooth parts are respectively and vertically connected with the three first subsections correspondingly, the inner ends of the three tooth parts are arc line sections and positioned on the same circle, an open slot which is opened towards the center direction of the yoke part is arranged in the center of each arc line section, and the open slots are arranged in line symmetry relative to the longitudinal center of the tooth parts. The stator core has obvious inhibition effect on radial electromagnetic force generated by a harmonic magnetic field of the motor, so that the electromagnetic vibration and noise of the motor can be effectively reduced.

Description

Stator core, stator and motor
Technical Field
The invention relates to the technical field of motors, in particular to a stator core, a stator and a motor.
Background
The stator core in the related art is applied to a motor, so that the motor has large vibration and noise, and the motor is applied to household appliances such as cleaning equipment, so that uncomfortable experience is caused to users.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a stator core, which has a significant inhibiting effect on radial electromagnetic force generated by a harmonic magnetic field of a motor, so that electromagnetic vibration and noise of the motor can be effectively reduced.
The invention also provides a stator with the stator core.
The invention also provides a motor with the stator.
The stator core comprises an annular yoke part and three tooth parts arranged in an inner ring of the yoke part, wherein the three tooth parts are uniformly distributed along the circumferential direction of the yoke part, each tooth part extends along the radial direction of the yoke part, the inner ring of the yoke part comprises three straight line sections uniformly distributed along the circumferential direction of the yoke part on the cross section of the stator core, each straight line section comprises a first subsection and two second subsections positioned on two sides of the first subsection, the three tooth parts are respectively and vertically connected with the three first subsections correspondingly, the inner ends of the three tooth parts are arc line sections and positioned on the same circle, open grooves which are opened towards the central direction of the yoke part are formed in the central position of each arc line section, and the open grooves are arranged in a line symmetry mode relative to the longitudinal center of the tooth parts.
The stator core has obvious inhibition effect on radial electromagnetic force generated by a harmonic magnetic field of the motor, so that the electromagnetic vibration and noise of the motor can be effectively reduced.
A stator according to a second aspect of the invention includes the stator core according to the first aspect of the invention; and the three-phase winding coils are respectively and correspondingly wound on the three tooth parts, each tooth part is respectively provided with one phase of winding coil, and the three-phase winding coils are connected end to form a triangular wiring.
According to the stator of the invention, by arranging the stator core of the first aspect, the radial electromagnetic force generated by the harmonic magnetic field of the motor is obviously inhibited, so that the electromagnetic vibration and noise of the motor can be effectively reduced.
The electric machine according to the third aspect of the invention comprises the stator according to the second aspect of the invention; and a rotor rotatably disposed within the stator.
According to the motor of the invention, by arranging the stator of the second aspect, the radial electromagnetic force generated by the harmonic magnetic field of the motor is obviously inhibited, so that the electromagnetic vibration and noise of the motor can be effectively reduced.
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
FIG. 1 is a cross-sectional schematic view of an electric machine according to one embodiment of the present invention;
FIG. 2 is an enlarged partial view of the motor shown in FIG. 1;
FIG. 3 is a schematic longitudinal cross-sectional view of a motor according to one embodiment of the present invention;
fig. 4-6 are graphs of experimental data for a motor according to some embodiments of the present invention.
Reference numerals:
a motor 1000; stator 100: a rotor 200;
a stator core 1; a winding coil 2;
a yoke 11; an inner ring 11 a; straight line segment 11a 1; the circular arc segment 11a 2;
the first subsection 11a 11; the second subsection 11a 12;
an outer ring 11 b; the grooves 11b 1; the first subslot 11b 11; the second subslot 11b 12;
a tooth portion 12; a body portion 121; side 1211; a pole shoe 122; an arc segment 1221; an open slot 1222;
a first phase winding coil 21; a second phase winding coil 22; a third phase winding coil 23;
a rotating shaft 3; an annular magnetic steel 4; a circular arc surface 41; a magnetic protection ring 5.
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 drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.
Next, a stator core 1 according to an embodiment of the first aspect of the invention is described with reference to the drawings.
As shown in fig. 1, the stator core 1 includes an annular yoke portion 11 and three teeth 12 provided in an inner ring 11a of the yoke portion 11, the three teeth 12 being uniformly distributed in a circumferential direction of the yoke portion 11, each tooth 12 extending in a radial direction of the yoke portion 11. In the cross section of the stator core 1, the inner ring 11a of the yoke 11 comprises three straight line segments 11a1 uniformly distributed along the circumference of the yoke 11, and each straight line segment 11a1 comprises one first sub-segment 11a11 and two second sub-segments 11a12 positioned at two sides of the first sub-segment 11a 11. Furthermore, in some embodiments of the present invention, the inner ring 11a of the yoke 11 may further include a circular arc segment 11a2 connected between two adjacent straight segments 11a 1.
As shown in fig. 1 and 2, the three teeth 12 are vertically connected to the three first segments 11a11, that is, each tooth 12 is vertically connected to one first segment 11a11, so that the longitudinal centerline y-y of each tooth 12 is perpendicular to the corresponding first segment 11a11, each tooth 12 is connected to the corresponding first segment 11a11, the inner ends of the three teeth 12 are arc segments 1221 and are located on the same circle, the center of each arc segment 1221 is provided with an open slot 1222 opened toward the center of the yoke 11, and the open slot 1222 is axially symmetric with respect to the longitudinal centerline y-y of the tooth 12.
Therefore, when the stator core 1 according to the embodiment of the present invention is used in the motor 1000, the tooth 12 is connected to the yoke 11 in a T shape, and the inner end of the tooth 12 is opened with the open slot 1222, so that when the stator core 1 according to the embodiment of the present invention is used in the motor 1000, a radial electromagnetic force generated by a harmonic magnetic field of the motor 1000 is significantly suppressed, and thus electromagnetic vibration and noise of the motor 1000 can be effectively reduced.
Specifically, the basic formula of the motor torque
Figure BDA0002156989840000031
Wherein z is the number of slots, 2p is the number of poles, L is the length of the core, BrFor permanent-magnet remanent flux, for inner-rotor motors R1And R2For the outer diameter of the rotor yoke and the inner diameter of the stator, n is an integer such that nz/2p is a positive integer, it is obvious that in the case of dimensioning the machine, only the reduction B is necessaryrThe amplitude of the nz/2p harmonic component of (a) can reduce the cogging torque.
According to the principle, according to the motor 1000 of the embodiment of the present invention, the inner ends of the teeth 12 are provided with the open slots 1222, which is equivalent to increase the number of stator slots in the motor operation principle, when the open slots 1222 are arranged to be axisymmetric with respect to the longitudinal center line y-y of the teeth 12, the cogging torque of the open slots 1222 can cancel part of the cogging torque of the original stator slots, and the open slots 1222 play a role of reducing the amplitude of higher harmonics, thereby reducing the cogging torque of the whole motor 1000, and finally effectively reducing the vibration and noise of the motor.
In some embodiments of the present invention, as shown in fig. 1 and 2, the open slot 1222 is a rectangular slot, the centerline of the open slot 1222 coincides with the longitudinal centerline y-y of the tooth 12, the width of the open slot 1222 in a direction perpendicular to the longitudinal centerline y-y is W, and the arc length of the arc line segment 1221 is L, where W is 0.04-0.12 times L. The open slot 1222 has a depth H in a direction parallel to the longitudinal centerline y-y, where H is 1-2 times W.
Therefore, according to the stator core 1 of the embodiment of the present invention, the rectangular open slot 1222 is opened at the center position of the arc segment 1221 at the inner end of the tooth portion 12, the rectangular open slot 1222 is set to be axisymmetrically arranged along the center of the arc segment, and the open slot 1222 is set to the above size, so that the number of slots of the stator 100 of the stator core 1 is changed from 3 slots to approximately 6 slots, the amplitude of the first-order radial electromagnetic force of the tooth harmonic of the stator 100 is reduced, and the electromagnetic vibration and noise of the motor 1000 are further effectively reduced.
In some specific examples, the width W of the open slot 1222 may be 0.5mm-1mm, such as 0.5mm, 0.75mm, 1mm, etc., so as to better reduce the amplitude of the first-order radial electromagnetic force of the tooth harmonic of the stator 100, thereby effectively reducing the electromagnetic vibration and noise of the motor 1000.
In some embodiments of the present invention, as shown in fig. 1, the outer ring 11b of the yoke portion 11 has a groove 11b1 recessed from the outside to the inside, and the groove 11b1 penetrates both axial end faces of the stator core 1 in the axial direction of the stator core 1. Note that "inner" described herein means a side toward the central axis of the yoke 11, and the opposite side is "outer", that is, a side away from the central axis of the yoke 11. The central axis of the yoke 11 is the central axis of the motor 1000. Thus, the groove 11b1 can be used for mounting and positioning, and the groove 11b1 can be used for cooling. The inner wall surface of the groove 11b1 may be a smooth curved surface, such as an arc surface, so that the air flow resistance and noise can be reduced.
Specifically, as shown in fig. 1, the outer ring 11b of the yoke 11 has a set of grooves 11b1 at locations diametrically opposite each tooth 12, so that on the one hand the performance of the motor 1000 can be improved and on the other hand the above-mentioned positioning and cooling requirements can be met. For example, in the specific example shown in fig. 1, each set of grooves 11b1 may include one first subslot 11b11 and two second subslots 11b12, the two second subslots 11b12 being distributed on both sides of the first subslot 11b11, and the cross-sectional area of the first subslot 11b11 being greater than the cross-sectional area of the second subslot 11b 12. Thus, the performance of the motor 1000 may be better enhanced and the above-described positioning and cooling requirements may be better met.
In the motor among the correlation technique, the screw is squeezed into to the trompil on stator core mostly, the upper and lower end cover of fixed stator core and motor, however, because stator core is by a plurality of stator towards the piece stack, still need exert certain pressure after the stack, thickness changes after the suppression, leads to great error, can't effective and reliable location. In the embodiment of the present invention, the groove 11b1 can be used to effectively position the stator core 1, so as to avoid positioning and installation errors caused by the variation of the stacking thickness of the stator core 1.
For example, in an embodiment of the present invention, when the motor 1000 is assembled, the groove 11b1 and the positioning protrusion on the first tool may be used to cooperate to quickly position and mount the stator core 1 on the first tool, and simultaneously, the housing of the motor 1000 may be mounted on the second tool, and then the stator core 1 is interference-fitted into the housing of the motor 1000 by positioning the first tool and the second tool, so that the positioning and mounting of the stator core 1 and the housing may be simply and effectively implemented, and the mounting reliability is high. Moreover, after the stator core 1 is in interference fit with the housing of the motor 1000, a channel is formed between the groove 11b1 and the housing, and cooling can be performed by using the channel, that is, by providing the groove 11b1 on the outer ring 11b of the yoke 11 at a position corresponding to the tooth 12, the air flow caused by the operation of the high-speed motor 1000 can effectively cool the motor 1000.
Of course, the present invention is not limited thereto, and in other embodiments of the present invention, a positioning protrusion may be further disposed in the housing of the motor 1000, and the matching between the groove 11b1 and the positioning protrusion limits the relative circumferential rotation between the stator 100 and the housing of the motor 1000, so as to improve the assembly efficiency of the stator 100, that is, the stator can be directly positioned by using the machine shell, thereby avoiding the error caused by the lamination thickness of the iron core.
In some embodiments of the present invention, as shown in fig. 1 and 2, the tooth portion 12 may include a body portion 121 and a pole shoe portion 122, an outer end of the body portion 121 coincides with the first sub-segment 11a11, the pole shoe portion 122 is connected to an inner end of the body portion 121, the body portion 121 extends perpendicular to the first sub-segment 11a11 in a radial direction of the yoke portion 11, and a width D of the body portion 121 is constant along an extending direction of the body portion 121. That is, in the extending direction perpendicular to the body portion 121, two side edges 1211 of the body portion 121 are both straight side edges and are parallel to each other, and each side edge 1211 is perpendicular to the second sub-segment 11a 12. From this, have more obvious inhibiting action to the radial electromagnetic force that motor 1000 harmonic magnetic field produced, can reduce motor 1000's electromagnetic vibration and noise more effectively moreover to stator core 1's structure is simpler, convenient processing and design, and machining error is little.
For example, in the example shown in fig. 2, the extension length of the main body portion 121 is L1, the length of the second sub-segment 11a12 is L2, and the width of the main body portion 121 is D, wherein D is 0.4-0.8 times of L1, and L2 is 0.4-0.6 times of L1. Therefore, the radial electromagnetic force generated by the harmonic magnetic field of the motor 1000 is more obviously inhibited, and the electromagnetic vibration and noise of the motor 1000 can be more effectively reduced.
Next, a stator 100 according to an embodiment of the second aspect of the present invention is described with reference to the drawings.
As shown in fig. 1, the stator 100 includes: in the stator core 1 and the three-phase winding coil 2 according to the first embodiment, the three-phase winding coil 2 is wound around the three teeth 12, and each tooth 12 has one phase winding coil 2, that is, the winding coil 2 on each tooth 12 forms one phase, and the three-phase winding coils 2 are connected end to form a delta connection. For example, in the specific example shown in fig. 1, a first-phase winding coil 21 is wound around one tooth 12 of the three teeth 12, a second-phase winding coil 22 is wound around the other tooth 12, and a third-phase winding coil 23 is wound around the other tooth 12.
It should be noted that each tooth portion 12 may include a body portion 121 and a pole shoe portion 122, an outer end of the body portion 121 is connected to the yoke portion 11, the pole shoe portion 122 is connected to an inner end of the body portion 121 and extends along a circumferential direction of the yoke portion 11, and two ends of the pole shoe portion 122 respectively exceed two sides 1211 of the body portion 121 in the circumferential direction of the yoke portion 11. Therefore, the winding coil 2 of each phase can pass through the gap between the pole shoe portions 122 of two adjacent teeth 12 and be wound on the corresponding body portion 121, and the corresponding pole shoe portions 122 prevent the corresponding winding coil 2 from slipping off, so that the wiring method can effectively reduce the winding difficulty and improve the rotation speed of the motor 1000 to which the stator 100 is applied.
Specifically, the winding schemes of the three-phase motor in the related art are mostly distributed star connection, which is based on that 3-order and 3-order multiple harmonics exist in the back electromotive force of each phase winding, and in the same direction, if the angle connection is adopted, circulating current is generated. According to the stator 100 of the embodiment of the invention, the winding coils 2 are wound on the tooth parts 12, three-phase currents are respectively injected into the winding coils 2 of two adjacent tooth parts 12, and the winding coils 2 form a fractional slot centralized winding method (or called a centralized fractional slot winding method), so that the winding coefficient of the motor 1000 is 0, further 3 times and 3 times of harmonic waves are eliminated, further the wire diameter selection range is wider, and the processing is more convenient. Moreover, the wire diameter selection range of the winding coil 2 is wider, so that the number of turns of each phase of winding coil 2 can be 5-45 turns, and the motor 1000 meeting different power requirements can be manufactured according to the requirements, so as to meet different actual requirements.
In some embodiments of the invention, as shown in fig. 2, the pole shoe angle a of each tooth 12 is 80-90 °. The pole shoe angle a is an angle between two ends of each pole shoe 122 and a line connecting center points of the yoke 11. Therefore, the winding of the coil is convenient.
Stator core among the correlation technique, in order to guarantee the motor performance, need minimize the clearance between the adjacent utmost point boots, but, this kind of mode is the automatic wire winding of being convenient for again, for the wire winding is convenient, stator core adopts the concatenation scheme, make a plurality of tooth portions concatenation of stator core link to each other, when the coiling winding coil, guarantee that stator core is in the non-concatenation state, at this moment, can need not to pass the clearance between the adjacent utmost point boots, just can be directly to every tooth portion coiling winding coil, splice into complete stator core with the stator core part of coiling good winding coil again, however, this is the stator core of concatenation formula with high costs, the processing is complicated, and the contact surface of concatenation position is cracked, this department's magnetic resistance is great, be unfavorable for the magnetic conduction.
According to the stator core 1 of the embodiment of the present invention, because the number of the tooth portions 12 included in the stator core 1 is small, the tooth portions 12 are connected with the yoke portion 11 in a T shape, and the inner ends of the tooth portions 12 are provided with the open slots 1222, and the winding method is adopted, the distance between the pole shoe portions 122 of the adjacent stators 100 is large while the performance is ensured, so that automatic winding can be achieved without using the scheme of the spliced core, and the stator core 1 according to the embodiment of the present invention can be formed by laminating a plurality of non-spliced stator laminations, thereby effectively solving the technical problems of high cost and complex processing, avoiding the fracture problem of the spliced surface, and avoiding the problems of large magnetic resistance at the spliced surface and unfavorable magnetic conduction.
Next, a motor 1000 according to an embodiment of the third aspect of the present invention is described with reference to the drawings.
As shown in fig. 1, the motor 1000 includes: in the stator 100 and the rotor 200 of the second embodiment, the rotor 200 is rotatably disposed in the stator 100. That is, the rotor 200 is rotatably provided in a space defined by inner ends of the three teeth 12. In some embodiments of the present invention, as shown in fig. 3, the rotor 200 may include a rotating shaft 3, an annular magnetic steel 4 and a magnetic protection ring 5, wherein the annular magnetic steel 4 is a single piece and is sleeved outside the rotating shaft 3, and the magnetic protection ring 5 is sleeved outside the annular magnetic steel 4. That is to say, the annular magnetic steel 4 and the magnetic protection ring 5 are both hollow cylinders, the annular magnetic steel 4 is sleeved outside the rotating shaft 3, and then the magnetic protection ring 5 is sleeved outside the annular magnetic steel 4, so as to form the rotor 200 of the motor 1000, thereby enabling the size of the rotor 200 to be smaller and further enabling the size of the motor 1000 to be smaller.
The rotor of the high-speed motor in the related technology is mostly composed of a rotating shaft, a rotor core silicon steel sheet and tile-shaped magnetic steel, wherein the tile-shaped magnetic steel is embedded into the rotor core silicon steel sheet or is pasted on the surface of the rotor core silicon steel sheet, the size of the rotor is large, the centrifugal force of the motor during high-speed operation is large, and the tile-shaped magnetic steel is easy to saturate, so that the efficiency of the motor is low.
According to the rotor 200 of the embodiment of the present invention, the ring-shaped magnetic steel 4 is used to replace the tile-shaped magnetic steel, and the silicon steel sheet of the iron core of the rotor 200 is omitted, so that the size of the motor 1000 is small, the efficiency is high, the centrifugal force is small, and the rotation speed of the motor 1000 is improved, for example, the ring width R of the ring-shaped magnetic steel 4 is 2mm to 4mm, such as 2mm, 2.5mm, 3mm, 3.5mm, 4mm, and the rotation speed of the motor 1000 can be not less than 20000R/min, therefore, according to the motor 1000 of the embodiment of the present invention, the brushless dc high-speed motor 1000 can be provided as the stator 100 of the second aspect embodiment is included, and the rotation speed of the motor 1000 can be not less than 20000R/min, such as 80000R/. In addition, when the ring width R of the ring-shaped magnetic steel 4 is 2mm to 4mm, the outer diameter of the rotor 200 (i.e., the outer diameter of the magnetic protection ring 5) is 5mm to 15 mm.
It should be noted that the processing method of the ring magnet steel 4 according to the embodiment of the present invention is not limited, and for example, the ring magnet steel 4 may be formed by pressing a powder material, and then magnetizing the powder material so that the ring magnet steel 4 has a pair of magnetic poles or a plurality of pairs of magnetic poles, and for the iron core of the rotor 200 with a small size, the ring magnet steel 4 may be easily processed into a pair of magnetic poles (i.e., including a pair of NS poles). In addition, for the processed annular magnetic steel 4, the structural strength of the annular magnetic steel 4 can be improved by the magnetic protection ring 5, so that the reliability and the service life of the motor 1000 are improved.
In some embodiments of the present invention, as shown in fig. 3, an axial length M1 of the annular magnetic steel 4 is greater than an axial length M2 of the stator core 1, and a distance between an axial end face of the annular magnetic steel 4 and a corresponding side axial end face of the stator core 1 is K, where K is 0.05-0.1 times M1. That is to say, in the axial direction of the motor 1000, both ends of the annular magnetic steel 4 are higher than the stator core 1, so that the magnetic lines of force generated by the annular magnetic steel 4 can enter the stator core 1 more intensively. For example, in some specific examples of the invention, K may be 0.5mm to 1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and the like. Therefore, magnetic lines of force generated by the annular magnetic steel 4 can enter the stator core 1 in a concentrated manner.
In addition, as shown in fig. 3, the axial center of the annular magnetic steel 4 may coincide with the axial center of the stator core 1, so that the distance K between the two axial side end faces of the annular magnetic steel 4 and the two axial side end faces of the stator core 1 is equal, or in the axial direction of the motor 1000, the annular magnetic steel 4 is distributed at equal intervals higher than the two ends of the stator core 1. Therefore, the magnetic force lines generated by the annular magnetic steel 4 can enter the stator core 1 more intensively.
In some embodiments of the present invention, as shown in fig. 3, two axial ends of the outer circumferential surface of the annular magnetic steel 4 are smoothly transitionally connected to two axial end surfaces of the annular magnetic steel 4 through arc surfaces 41, respectively. That is to say, the excircle of the axial end face of the annular magnetic steel 4 adopts a fillet design, or the axial edge of the annular magnetic steel 4 is chamfered. Therefore, the waveform of the magnetic force line generated by the annular magnetic steel 4 can be optimized. The radius r of the arc surface 41 is 0.2mm-0.5mm, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc., so as to better optimize the waveform of the magnetic force lines generated by the annular magnetic steel 4.
In some embodiments of the present invention, as shown in fig. 2, the rotor 200 is coaxially disposed with the stator 100, and the air gap M between the stator 100 and the rotor 200 in the radial direction of the motor 1000 is 0.5mm to 0.75mm, that is, the gap between the inner circumference of the stator 100 and the outer circumference of the rotor 200 in the radial direction of the motor 1000 is 0.5mm to 0.75 mm. Therefore, the waveform of the magnetic force line generated by the annular magnetic steel 4 can be optimized.
To sum up, the centralized fractional slot triangle wiring method of the winding coil 2 is matched, and the number of turns of each phase of winding coil 2 is 5-45, so that the stator core 1 can be utilized to realize the wide power range setting of the motor 1000, that is, different power requirements are met by winding the winding coils 2 with different numbers of turns, and the magnetic line waveform can be effectively optimized by setting the annular magnetic steel 4 higher than the interval t1 of the stator core 1 and setting the air gap t2 between the stator 100 and the rotor 200 as above and by performing chamfering treatment on the axial edge of the annular magnetic steel 4.
In addition, the present invention also provides the following test data.
FIG. 4(a) shows: the noise spectrum of the unopened open slot 1222 has an ordinate representing the noise amplitude and an abscissa representing the noise frequency; FIG. 4(b) shows: the noise spectrum of the open slot 1222 is opened, the ordinate of the noise spectrum represents the noise amplitude, and the abscissa represents the noise frequency; FIG. 4(c) shows: the superposition of fig. 4(a) and 4(b), i.e., the comparison of the noise spectra of the opened slot 1222 and the unopened slot 1222 under otherwise unchanged conditions (IEC60704-2-1 test method), with the ordinate representing the noise amplitude and the abscissa representing the noise frequency. As can be seen from the above figure, after the open slot 1222 is opened, the fundamental frequency noise and the blade frequency high frequency multiplication noise of the motor 1000 are both reduced, and the fundamental frequency noise of the motor 1000 is obviously reduced.
As shown in fig. 5, the efficiency of the motor 1000 (IEC60312:2004 test method) is compared in which the opening depth H of the open slot 1222 is 1.0mm (shown as a) and 0.5mm (shown as B) respectively, and the ordinate represents the efficiency value of the motor 1000 and the abscissa represents different load parameters, for the efficiency comparison of the open slot 1222 with different opening depths H under otherwise unchanged conditions. As can be seen from the above figure, when the opening depth H of the open slot 1222 is 1.0mm, the efficiency of the motor 1000 under different loads is better than that of the open slot 1222 with the opening depth H of 0.5 mm.
As shown in fig. 6, for the efficiency comparison of the air gap M between the stator 100 and the rotor 200, which is different under otherwise unchanged conditions, the efficiency of the motor 1000 (IEC60312:2004 test method) is shown with the comparison air gaps M of 0.6mm (shown as C), 0.7mm (shown as D) and 0.75mm (shown as E) respectively, the ordinate of the efficiency value of the motor 1000 is represented, and the abscissa represents different loads. As can be seen from the above figures, the air gap M is 0.6mm, 0.7mm, 0.75mm, the efficiency contrast of the motor 1000 is not clearly regular, so the air gap M between the stator 100 and the rotor 200 according to the embodiment of the present invention can be set between 0.5mm and 0.75mm, for example, 0.6mm, 0.7mm, 0.75 mm.
It should be noted that the "load" described herein refers to: when the motor 1000 drives the centrifugal wind wheel to rotate, the air performance of the centrifugal wind wheel under different air inlet wind plugs can be adjusted, for example, a perforated plate with multiple holes is arranged at the air inlet of the centrifugal wind wheel, and a blocking piece is arranged at the position of each hole, so that the ventilation aperture of each hole can be changed by adjusting the position of each blocking plate, and the air inlet wind plugs can be adjusted.
In summary, according to the motor 1000 of the embodiment of the present invention, the stator 100 and the rotor 200 are optimized, so that the motor 100 has high speed, high efficiency, low electromagnetic noise and low vibration.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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 (21)

1. A stator core comprising an annular yoke portion and three teeth portions provided in an inner ring of the yoke portion, the three teeth portions being uniformly distributed along a circumferential direction of the yoke portion, each tooth portion extending in a radial direction of the yoke portion,
on the cross section of the stator core, the inner ring of the yoke portion comprises three straight line sections which are uniformly distributed along the circumferential direction of the yoke portion, each straight line section comprises a first subsection and two second subsections which are positioned on two sides of the first subsection, the three tooth portions are respectively and vertically connected with the three first subsections in a corresponding mode, the inner ends of the three tooth portions are arc line sections and are positioned on the same circle, an open slot which is opened towards the center direction of the yoke portion is formed in the center of each arc line section, and the open slots are arranged in a line symmetry mode relative to the longitudinal center line of the tooth portions.
2. The stator core of claim 1, wherein the open slots are rectangular slots, a center line of the open slots coincides with a longitudinal center line of the tooth portion, a width of the open slots in a direction perpendicular to the longitudinal center line is W, an arc length of the arc line segment is L, where W is 0.04-0.12 times the L, and a depth of the open slots in a direction parallel to the longitudinal center line is H, where H is 1-2 times the W.
3. The stator core according to claim 2 wherein the width W is 0.5mm-1 mm.
4. The stator core according to claim 1 wherein a pole shoe angle a of the teeth is 80 ° -90 °.
5. The stator core according to claim 1, wherein the stator core is formed by laminating a plurality of non-spliced stator laminations.
6. The stator core according to claim 1, wherein the outer ring of the yoke portion has a groove recessed from outside to inside, the groove penetrating through both axial end faces of the stator core in an axial direction of the stator core.
7. The stator core according to claim 6, wherein an inner wall surface of the groove is a smooth curved surface.
8. The stator core as claimed in claim 6 wherein a set of the slots is located diametrically opposite each of the teeth.
9. The stator core of claim 8 wherein each set of slots includes a first subslot and two second subslots, the two second subslots disposed on opposite sides of the first subslot, the first subslot having a cross-sectional area greater than the cross-sectional area of the second subslot.
10. The stator core according to claim 1, wherein the tooth portion comprises a body portion and pole shoe portions, an outer end of the body portion coincides with the first subsection, the pole shoe portions are connected to an inner end of the body portion, the body portion extends perpendicular to the first subsection in a radial direction of the yoke portion, and a width D of the body portion is constant along an extending direction of the body portion.
11. The stator core of claim 10 wherein the body portion extends a length of L1, the second sub-segment has a length of L2, and the body portion has a width of D, wherein D is 0.4-0.8 times L1 and L2 is 0.4-0.6 times L1.
12. A stator, comprising:
a stator core according to any one of claims 1-11; and
the three-phase winding coils are respectively and correspondingly wound on the three tooth parts, each tooth part is provided with one phase of winding coil, and the three phases of winding coils are connected end to form a triangular wiring.
13. The stator core according to claim 12 wherein the number of turns of the winding coil of each phase is 5-45 turns.
14. An electric machine, comprising:
a stator according to claim 12 or 13; and
a rotor rotatably disposed within the stator.
15. The electric machine of claim 14 wherein said rotor includes a shaft, an annular magnetic steel and a magnetic shield ring, said annular magnetic steel being a unitary piece and disposed about said shaft, said magnetic shield ring disposed about said annular magnetic steel.
16. The motor of claim 15, wherein the ring width R of the ring-shaped magnetic steel is 2mm-4mm, and the rotation speed of the motor is more than or equal to 20000R/min.
17. The electric machine of claim 15, wherein the annular magnetic steel has an axial length M1 greater than the axial length M2 of the stator core, and wherein a spacing between an axial end face of the annular magnetic steel and a corresponding axial end face of the stator core is K, wherein K is 0.05-0.1 times M1.
18. The electric machine of claim 17, wherein an axial center of the annular magnetic steel coincides with an axial center of the stator core, such that the spacing K is equal on both axial sides.
19. The electric machine according to claim 15, wherein the outer circumferential surface of the annular magnetic steel is smoothly transitionally connected with the axial end surface of the annular magnetic steel through an arc surface.
20. The machine of claim 19 wherein the radius r of the arcuate surface is 0.2mm to 0.5 mm.
21. The electric machine of claim 15, wherein the rotor is arranged coaxially with the stator, and the air gap M between the stator and the rotor in the radial direction of the electric machine is 0.5mm-0.75 mm.
CN201910720463.8A 2019-08-06 2019-08-06 Stator core, stator and motor Pending CN112350464A (en)

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Publication number Priority date Publication date Assignee Title
CN2747679Y (en) * 2004-06-12 2005-12-21 横店集团东磁有限公司 Tile shape permanent magnet ferrite
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CN106329787A (en) * 2015-07-10 2017-01-11 胡永健 Brushless direct current motor
CN205911841U (en) * 2016-07-29 2017-01-25 苏州工业园区星德胜电机有限公司 Stator core reaches high strength brushless DC motor including this stator core
CN207542894U (en) * 2017-09-14 2018-06-26 炬大科技有限公司 A kind of brushless motor stator core structure

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Publication number Priority date Publication date Assignee Title
CN2747679Y (en) * 2004-06-12 2005-12-21 横店集团东磁有限公司 Tile shape permanent magnet ferrite
CN106329787A (en) * 2015-07-10 2017-01-11 胡永健 Brushless direct current motor
CN205509812U (en) * 2016-04-07 2016-08-24 苏州工业园区星德胜电机有限公司 High -efficient brushless DC motor
CN205911841U (en) * 2016-07-29 2017-01-25 苏州工业园区星德胜电机有限公司 Stator core reaches high strength brushless DC motor including this stator core
CN207542894U (en) * 2017-09-14 2018-06-26 炬大科技有限公司 A kind of brushless motor stator core structure

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Application publication date: 20210209