CN111953114B - Stator, motor and air supply device - Google Patents
Stator, motor and air supply device Download PDFInfo
- Publication number
- CN111953114B CN111953114B CN202010395637.0A CN202010395637A CN111953114B CN 111953114 B CN111953114 B CN 111953114B CN 202010395637 A CN202010395637 A CN 202010395637A CN 111953114 B CN111953114 B CN 111953114B
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- 238000004804 winding Methods 0.000 claims abstract description 77
- 230000008878 coupling Effects 0.000 claims abstract description 27
- 238000010168 coupling process Methods 0.000 claims abstract description 27
- 238000005859 coupling reaction Methods 0.000 claims abstract description 27
- 239000012212 insulator Substances 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 10
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Provided are a stator, a motor, and a blower device, wherein the stator has a stator core and a coil part, the stator core has an annular core back and a plurality of teeth parts extending from the core back along the radial direction, each tooth part has: an inner tooth portion extending radially from a radially outer surface of the core back portion; a connecting portion connected to a radially outer end portion of the internal tooth portion and extending in a circumferential direction; and 3 or more external teeth portions extending radially outward from a radially outer surface of the coupling portion and arranged in a circumferential direction, the coil portion including: an inner coil part formed by winding a wire around the inner tooth part; and a plurality of outer coil portions formed by winding wires around the external tooth portions, the inner coil portion and the plurality of outer coil portions of each tooth portion being formed of 1 wire.
Description
Technical Field
The invention relates to a stator, a motor and an air supply device.
Background
Japanese patent application laid-open No. 2001-169495 discloses a stator of a rotary machine. The stator has a plurality of magnetic poles formed by winding a stator coil around a plurality of pole teeth radially protruding from a stator core via a bobbin of insulating resin.
Patent document 1: japanese patent laid-open No. 2001-169495
In general, in a motor, the output torque can be increased by increasing the number of turns of a stator coil. In the case of the rotary machine described in japanese patent application laid-open No. 2001-169495, when the number of windings of the stator coil is increased, there is a possibility that interference with the adjacent stator coil occurs. Therefore, when the number of windings is increased, the outer diameter of the motor increases, and it is difficult to miniaturize the motor.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a stator in which the number of windings can be increased without increasing the size.
Further, an object of the present invention is to provide a motor capable of increasing an output torque without increasing the size.
Further, an object of the present invention is to provide an air blower that can increase the air volume without increasing the size.
An exemplary stator of the present invention includes: a stator core; and a coil portion formed by winding a wire around a portion of the stator core, wherein the stator core has: the back of the annular iron core; and a plurality of teeth extending radially from the core back and arranged circumferentially, each of the teeth having: an inner tooth portion extending radially from a radially outer surface of the core back portion; a connecting portion connected to a radially outer end portion of the internal tooth portion and extending in a circumferential direction; and 3 or more external teeth portions extending radially outward from a radially outer surface of the coupling portion and arranged in a circumferential direction, the coil portion including: an inner coil part formed by winding a wire around the inner tooth part; and a plurality of outer coil portions formed by winding wires around the outer tooth portions, the inner coil portion and the plurality of outer coil portions being formed of 1 wire.
According to the exemplary stator of the present invention, the number of windings can be increased without increasing the size.
Further, according to the motor of the present invention, the output torque can be increased without increasing the size.
According to the exemplary blower of the present invention, the blower can blow air with a stable air volume.
Drawings
Fig. 1 is a perspective view showing an example of the blower of the present invention.
Fig. 2 is a longitudinal sectional view showing the blower device shown in fig. 1.
Fig. 3 is a cross-sectional view taken perpendicular to the central axis of the motor.
Fig. 4 is a plan view of the stator with the coil part removed.
Fig. 5 is a perspective view of the stator core.
Fig. 6 is a schematic view of a tooth portion showing a winding sequence of a wire.
Fig. 7 is a diagram showing the flow of magnetic force generated when current flows through the inner coil portion and the outer coil portion of the tooth portion.
Fig. 8 is a plan view showing a modification of the stator core.
Description of the reference numerals
1: a rotor; 11: a rotor core; 12: a rotor housing; 13: a rotor magnet; 14: a shielding member; 2: a stator; 3: a stator core; 30: a stator sheet; 31: the back of the iron core; 311: a through hole; 312: dividing the back of the iron core; 32: a tooth portion; 321: an internal tooth portion; 322: a connecting part; 323: 1 st external tooth part; 324: 2 nd external tooth part; 325: 3 rd external tooth part; 326: an umbrella part; 33: dividing the iron core; 3a: a stator core; 31a: the back of the iron core; 4: an insulating member; 40: a cover section; 41: a protruding portion; 42: a wall portion; 5: a coil section; 50a: 1 st wire bonding; 50b: the 2 nd wire is lapped; 50c: 3, wiring; 50d: a 4 th wire; 51: an inner coil portion; 52: a 1 st outer coil part; 53: a 2 nd outer coil part; 54: a 3 rd outer coil part; 6: a bearing; 61: an outer ring; 62: an inner ring; 7: a wiring substrate; 100: a support post; 101: a base portion; 110: a rotor sheet; 200: a motor; 300: an impeller; 301: an impeller housing; 302: a blade; 303: a bearing mounting portion; 304: a cover portion; 305: a main body portion; 306: a through hole; 307: a rotor mounting portion; 308: a rotor mounting cover portion; 309: a rotor mounting cylinder; 3221: an inclined portion; a: an air supply device; cx: a central axis.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, a direction parallel to the central axis Cx of the blower a is referred to as an "axial direction". The direction perpendicular to the central axis Cx is also referred to as the "radial direction". The direction along the circular arc centered on the central axis Cx is referred to as the "circumferential direction". The above-described direction and surface are used for the purpose of explanation, and the positional relationship and direction of the blower a and the motor 200 in the use state are not limited.
< 1. Air supply device A >)
Fig. 1 is a perspective view showing an example of an air blower a according to the present invention. Fig. 2 is a longitudinal sectional view of the blower a shown in fig. 1. As shown in fig. 1 and 2, the blower a of the present embodiment is a sealed fan.
The blower a includes a stay 100, a motor 200, and an impeller 300. The impeller 300 is mounted on the column 100 via the bearing 6, and is rotated by driving the motor 200. By the rotation of the impeller 300, an air flow toward the axially lower side is generated.
< 2, strut 100 >
The column 100 is disposed along a central axis Cx extending vertically. The stay 100 is a tubular member made of metal, for example. Leads (not shown) connected to a circuit board 7, which will be described later, of the motor 200 are disposed inside the support posts 100. The stay 100 may be made of a material other than metal such as ceramic.
The post 100 is fixed to the ceiling (not shown) of a room. The support column 100 has a base portion 101 at an end portion on an axially lower side thereof. The base portion 101 expands in the radial direction. The base portion 101 may be formed integrally with the pillar 100, or may be attached to the pillar 100.
< 3 impeller 300 >)
As shown in fig. 1 and 2, the impeller 300 has an impeller housing 301 and a plurality of blades 302. The impeller 300 generates an air flow downward from the axial direction. The impeller housing 301 is rotatably supported by the strut 100 via the bearing 6. The impeller housing 301 has a space therein, and a part of the stay 100 and the motor 200 are disposed inside the impeller housing 301.
The plurality of blades 302 are disposed on the upper surface of the impeller housing 301. The plurality of blades 302 are arranged in the circumferential direction. In the blower a of the present embodiment, the blades 302 are arranged at equal intervals on the upper surface of the impeller housing 301. The impeller 300 of the present embodiment has 3 blades 302, but is not limited thereto, and may have 4 or more or 2 or less.
The impeller housing 301 has a bearing mounting portion 303 at an end portion on an axially upper side. The bearing mounting portion 303 is rotatably mounted to the strut 100 by 2 bearings 6 arranged apart in the axial direction. The bearing mounting portion 303 has a closed cylindrical shape. The bearing mounting portion 303 has a cover portion 304 and a main body portion 305. The cover 304 is provided at an end portion of the bearing mounting portion 303 on the axial direction upper side and expands radially inward. The body 305 has a cylindrical shape extending axially downward from the radially outer edge of the cover 304.
The lid 304 has a through hole 306 penetrating in the axial direction in the radial center. The post 100 penetrates the through hole 306. The bearing 6 is disposed inside the bearing mounting portion 303. In the present embodiment, the bearing 6 is a ball bearing. The strut 100 is fixed to the inner race 62 of the bearing 6. The outer ring 61 of the bearing 6 is fixed to the inner surface of the main body 305. Thereby, the impeller housing 301 is rotatably supported by the strut 100 via the bearing 6.
The impeller housing 301 has a rotor attachment portion 307 in the shape of a cap. The rotor mounting portion 307 is integrally manufactured with the impeller housing 301. The rotor mounting portion 307 has a rotor mounting cover portion 308 and a rotor mounting cylinder portion 309. The rotor mounting cover 308 has a disk shape that extends in a direction perpendicular to the central axis Cx at an end portion on the axial upper side of the inside of the impeller housing 301. The rotor mounting cylinder 309 extends axially downward from a radially outer edge portion of the rotor mounting cover 308. The rotor 1 is fixed to the rotor mounting portion 307. More specifically, a rotor case 12, which is described later, having a rotor core 11 and rotor magnets 13, which are described later, inside thereof is fixed to the rotor mounting portion 307.
< 4 Motor 200 >)
Next, the structure of the motor 200 will be described. Fig. 3 is a cross-sectional view of the motor 200, which is cut by a plane perpendicular to the central axis Cx. As shown in fig. 2 and 3, the motor 200 has a rotor 1 and a stator 2. Hereinafter, each portion of the rotor 1 and the stator 2 will be described in detail. The stator 2 of the motor 200 is radially opposed to the inner peripheral surface of the rotor 1. That is, the motor 200 is an outer rotor type DC brushless motor.
< 4.1 rotor 1 >
As shown in fig. 2 and 3, the rotor 1 includes a rotor core 11, a rotor case 12, and rotor magnets 13. The rotor magnets 13 are arranged so that the S-poles or the N-poles alternate in the circumferential direction.
The rotor core 11 is formed by stacking a plurality of rotor pieces 110 made of electromagnetic steel plates or the like in the axial direction so as to surround the central axis Cx in an annular shape. The rotor core 11 axially overlaps the rotor pieces 110 and is fixed by a fixing method such as caulking. Thereby, the rotor core 11 has a ring shape extending along the central axis Cx. The fixing of the rotor sheet 110 is not limited to caulking, and may be performed by a fixing method such as adhesion or welding. The rotor core 11 is not limited to a laminate, and may be a molded body formed by fixing magnetic powder such as iron powder by sintering or the like.
The rotor core 11 has a ring shape centered on the central axis Cx. A rotor magnet 13 is disposed on the rotor core 11. The rotor case 12 is a holding member that holds the rotor core 11 inside. The rotor case 12 has a cylindrical shape and is in contact with a part of the radially outer side of the rotor core 11 in the axial direction. Thereby, the rotor case 12 holds the rotor core 11. The method of fixing the rotor case 12 and the rotor core 11 is not limited to press-fitting, for example. For example, a method of fixing the rotor case 12 and the rotor core 11 by adhesion, welding, or the like can be widely used.
< 4.2 stator 2 >
Next, the stator 2 will be described with reference to the drawings. Fig. 4 is a plan view of the stator 2 with the coil part 5 removed. Fig. 5 is a perspective view of the stator core 3. Fig. 6 is a schematic view of a tooth portion showing a winding sequence of a wire.
As shown in fig. 3, the stator 2 is radially opposed to the rotor 1. The stator 2 is an armature that generates magnetic force according to a driving current. As shown in fig. 2 to 4, the stator 2 includes a stator core 3, an insulator 4, and a coil portion 5. The stator 2 includes a stator core 3 and a coil portion 5, and the coil portion 5 is formed by winding a wire around a part of the stator core 3. The motor 200 is, for example, a three-phase DC brushless motor. Therefore, three-phase currents having different phases of the U-phase, the V-phase, and the W-phase are supplied to the coil portion 5 of the motor 200.
< 4.3 stator core 3 >
As shown in fig. 5, the stator core 3 is formed by stacking a plurality of stator pieces 30 made of electromagnetic steel plates or the like in the axial direction. For ease of explanation, in the stator piece 30 shown in fig. 5, the axial thickness is shown thicker than the actual stator piece 30 with respect to the dimensions of the core back 31 and the tooth 32 described later.
The stator core 3 is fixed by overlapping the stator pieces 30 in the axial direction and fixing them by caulking or the like. The stator plate 30 may be fixed by bonding, welding, or other fixing methods, not limited to caulking. The stator core 3 is not limited to a laminate, and may be a molded body formed by fixing magnetic powder such as iron powder by sintering or the like. The stator core 3 has a core back 31 and teeth 32.
< 4.3.1 core back 31 >
As shown in fig. 5, the core back 31 has a ring shape with a center line aligned with the center axis Cx. That is, the stator core 3 has an annular core back 31. The core back 31 has a through hole 311 extending along the central axis at the center. As shown in fig. 2, in motor 200, post 100 is inserted into through hole 311, and core back 31 is fixed to post 100. For example, the stay 100 is fixed to the through hole 311 by press fitting. However, the fixation of the core back 31 and the leg 100 is not limited to press fitting, and for example, a method of reliably fixing the core back 31 to the leg 100 by bonding, welding, or the like can be widely used.
< 4.3.2 teeth 32 >)
As shown in fig. 2 and 3, the plurality of teeth 32 protrude radially outward from the radially outer edge of the core back 31. The teeth 32 have the same number of U-phase teeth, V-phase teeth, and W-phase teeth, respectively. In the following description, the teeth of each phase are collectively referred to as teeth 32. As shown in fig. 4, 5, and the like, the stator core 3 has, for example, 3 teeth 32 of each phase and 9 teeth 32 in total. In the stator 2, the U-phase teeth 32, the V-phase teeth 32, and the W-phase teeth 32 are arranged in this order around the counterclockwise direction when viewed from above. That is, the stator core 3 has a plurality of teeth 32 extending in the radial direction from the core back 31 and arranged in the circumferential direction.
As shown in fig. 4 and 5, the tooth portion 32 includes an internal tooth portion 321, a connecting portion 322, a 1 st external tooth portion 323, a 2 nd external tooth portion 324, and a 3 rd external tooth portion 325. That is, the tooth portion 32 has 1 inner tooth portion 321 and 3 outer tooth portions 323, 324, 325. The number of the internal teeth 321 is not limited to 1, and may be plural.
The number of external teeth portions is not limited to 3, and may be 3 or more. In view of the structure in which the teeth 32 are radially arranged from the core back 31, the ease of winding the wire, and the like, it is preferable that the number of the internal teeth 321 be smaller than the number of the external teeth. That is, the number of internal teeth 321 is smaller than the number of external teeth 323, 324, 325. By setting the number of the internal teeth 321 to be smaller than the number of the external teeth 323, 324, 325, the wire winding operation can be performed efficiently. This can improve productivity.
The internal teeth 321 have a columnar shape protruding radially outward from the outer peripheral surface of the core back 31. The coupling portion 322 is connected to the radially outer edge of the internal tooth portion 321. The coupling portions 322 extend from the radially outer edges of the internal tooth portions 321 to both sides in the circumferential direction. As shown in fig. 5, 6, and the like, inclined portions 3221 are provided at both ends in the circumferential direction of the coupling portion 322. The inclined portion 3221 is inclined toward the radial inner side toward the center side in the circumferential direction of the coupling portion 322.
That is, both circumferential ends of the coupling portion 322 have inclined portions 3221, and the inclined portions 3221 are inclined toward the radially inner side toward the central side in the circumferential direction of the coupling portion. In the stator core 3 of the present embodiment, the inclined portion 3221 has a curved surface shape, but is not limited thereto. The shape may be a planar shape or a shape in which a plurality of planes are aligned, as long as the radial inner side is inclined toward the center in the circumferential direction of the connecting portion 322.
When the coupling portion 322 is viewed from the internal tooth portion 321, the 1 st external tooth portion 323 protrudes radially outward from the left end portion of the coupling portion 322. When the coupling portion 322 is viewed from the internal tooth portion 321, the 3 rd external tooth portion 325 protrudes radially outward from the right end portion of the coupling portion 322. The 2 nd external tooth portion 324 is arranged in the circumferential direction at the intermediate portion between the 1 st external tooth portion 323 and the 3 rd external tooth portion 325. The center line extending in the radial direction of the 2 nd external tooth portion 324 coincides with the center line extending in the radial direction of the internal tooth portion 321 in the circumferential direction.
That is, the tooth portions 32 extend radially outward from the radially inner side along the inner tooth portion 321. The radially outer end of the internal tooth portion 321 is connected to the connecting portion 322. The coupling portion 322 extends in the circumferential direction, and the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325 extend radially outward from the outer circumferential surface of the coupling portion 322. The 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325 are arranged at equal intervals in the circumferential direction.
That is, each tooth portion 32 has: an internal tooth portion 321 extending radially from a radially outer surface of the core back 31; a coupling portion 322 that is connected to a radially outer end portion of the internal tooth portion 321 and extends in the circumferential direction; and 3 or more external teeth 323, 324, 325 extending radially outward from the radially outer surface of the coupling portion 321 and arranged in the circumferential direction.
The plurality of (9 in this case) teeth 32 are arranged at equal intervals in the circumferential direction. At this time, all the external teeth 323, 324, 325 are arranged at equal intervals in the circumferential direction on the radially outer surface of the coupling portion 321. That is, the interval in the circumferential direction between the 1 st external tooth portion 323 and the 3 rd external tooth portion 325 of the adjacent tooth portions 32 is the same as the interval between the 1 st external tooth portion 323 and the 2 nd external tooth portion 324 and the interval between the 2 nd external tooth portion 324 and the 3 rd external tooth portion 325 in the same tooth portion 32. That is, the stator core 3 has 9 internal teeth portions and 27 external teeth portions.
As shown in fig. 3 to 6, the radial front ends of the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325 have umbrella portions 326 extending to both sides in the circumferential direction.
< 4.4 insulating member 4 >)
As shown in fig. 4, the insulator 4 is a molded body of resin. The insulator 4 insulates the stator core 3 from the coil portion 5. Although details will be described later, the coil portion 5 is formed by winding wires around the internal tooth portion 321, the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325 of the tooth portion 32, respectively. Therefore, the insulator 4 covers at least the internal tooth portion 321, the connecting portion 322, the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325.
In the present embodiment, the insulator 4 is a molded resin body, but is not limited thereto. A structure capable of insulating the stator core 3 and the coil portion 5 can be widely adopted.
As shown in fig. 4, the cover portion 40 of the insulator 4, which covers the coupling portion 322 of the tooth portion 32, has a protruding portion 41 protruding axially upward from the axial surface. Although details will be described later, the protruding portion 41 is wound with a wire constituting the coil portion 5. Further, on the upper and lower surfaces of the insulator 4 in the axial direction, wall portions 42 protruding axially upward and downward are provided in portions overlapping the inner tooth portion 321, the 1 st outer tooth portion 323, the 2 nd outer tooth portion 324, and the 3 rd outer tooth portion 325 in the axial direction at both ends thereof (see fig. 4 and 6). In the present embodiment, the cover 40 covers the axial upper surface of the coupling portion 322, but is not limited thereto. The cover portion 40 may cover the lower axial surface of the coupling portion 322. At this time, the protruding portion 31 protrudes axially downward from the axially lower surface of the cover portion 40.
That is, the stator 2 further has an insulator 4 covering the stator core 3. The insulator 4 covers at least one of the axial end surfaces of the connecting portion 322 of the stator core 3. The insulator 4 has a protruding portion 41 protruding in the axial direction in a portion covering the coupling portion 322. In the case where the protruding portion 41 protrudes downward in the axial direction, the wiring board 7 may be held.
< 4.5 coil portion 5 >)
The coil portion 5 is formed by winding wires around the internal tooth portion 321, the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325 of the tooth portion 32, respectively. The coil portion 5 includes an inner coil portion 51, a 1 st outer coil portion 52, a 2 nd outer coil portion 53, and a 3 rd outer coil portion 54. The 1 st outer coil portion 52 is formed by winding a wire around the 1 st outer tooth portion 323. The 2 nd outer ring portion 53 is formed by winding a wire around the 2 nd outer tooth portion 324. The 3 rd external coil portion 54 is formed by winding a wire around the 3 rd external tooth portion 325.
That is, the coil section 5 includes: an inner coil portion 51 formed by winding a wire around the inner tooth portion 321; and a plurality of outer coil portions 52, 53, 54 formed by winding wires around the outer tooth portions 323, 324, 325.
The 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are in contact with the portion of the insulator 4 covering the connecting portion 322, the umbrella portion 326, and the wall portion 42 of the insulator 4 at both ends in the radial direction. Thus, since both ends in the radial direction of the coil are supported by the insulator 4, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are less likely to be deformed.
Further, both ends in the radial direction of the inner coil portion 51 formed in the inner tooth portion 321 are in contact with the portion of the insulator 4 covering the core back 31 and the connecting portion 322 and the wall portion 42 of the insulator 4. As a result, the inner coil portion 51 is not easily deformed, as is the case with the outer coil portions 52, 53, 54.
Since the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 of the coil portion 5 are not easily deformed, variations in rotation and output of the motor 200 are not easily generated, and stable driving is enabled. In addition, by adopting such a structure, the coil is not easily deformed even during the process of winding the wire. Therefore, the workability of the step of winding the wire can be improved.
The coil part 5 of the stator 2 of the present embodiment is formed by winding 1 wire around the internal tooth part 321, the 1 st external tooth part 323, the 2 nd external tooth part 324, and the 3 rd external tooth part 325 of the tooth part 32 in this order. Next, a method of winding a wire will be described with reference to the drawings. In the following description of the method of winding the wire, the right-left direction is defined with reference to the tooth portion 32 of fig. 6.
First, the winding direction of the wire will be described with reference to the inner coil portion 51. In the state shown in fig. 6, the lead wire is extended downward from the left side of the internal tooth portion 321. Then, the lead wire is extended in the axial lower direction of the internal tooth portion 321 toward the right side of the internal tooth portion 321. Next, the lead wire is extended upward on the left side of the internal tooth portion 321. Then, the lead wire is extended in the axial direction of the internal tooth portion 321 toward the left side of the internal tooth portion 321. That is, when the internal tooth portion 321 is viewed in the radial direction from the radially inner side, the wire is wound around the internal tooth portion 321 in the counterclockwise direction. The winding direction of the wire is set to be clockwise or counterclockwise with reference to the radial direction from the inside to the outside.
Then, the winding is performed closely beside the radial direction of the previously wound wire. The operation of winding the wire beside the wire is referred to as winding advancement. In the inner coil portion 51, the lead wire is wound and advanced from the radially inner side toward the radially outer side. Then, when reaching the radially outer side, the wire is wound around the wire that has been wound and advances from the radially outer side to the radially inner side. In this way, the inner coil portion 51 includes a plurality of layers of windings in the thickness direction with reference to the surface of the inner tooth portion 321. The winding formed by winding the wire from one end to the other end in the radial direction is called a winding layer.
The inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are wound by forming a plurality of winding layers on the inner tooth portion 321, the 1 st outer tooth portion 323, the 2 nd outer tooth portion 324, and the 3 rd outer tooth portion 325 covered with the insulating material 4.
In the coil part 5, the inner coil part 51 has 4 winding layers. The 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 have 2 winding layers. The number of layers of windings of the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 is not limited to the above. That is, each of the inner coil portion 51 and the outer coil portions 52, 53, 54 is formed by winding a wire in a plurality of layers. The number of layers of windings of the inner coil portion 51 is greater than the number of layers of windings of the outer coil portions 52, 53, 54.
The leads forming the coil portion are connected to a wiring board 7 described later provided axially below the stator 2. That is, in the stator 2, the wires are connected to the wiring substrate 7. Then, the wire starts winding from the core back 31 side. That is, in the coil portion 5, the end portion at which winding of the wire starts is arranged on the core back 31 side.
Then, the wire is wound around the internal tooth portion 321 and advanced to be reciprocated 1 half in the radial direction. Then, the wire is led out as a 1 st wire 50a from the right side of the internal tooth portion 321 to the axial upper portion of the cover portion 40 of the insulator 4. The wire is a portion of the wire of the coil portion 5 that passes through the upper portion of the cover portion 40 of the insulator 4 in the axial direction and connects the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54. That is, in the coil portion 5 of the present embodiment, the wires forming the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are connected by wire bonding in the axial direction of the cover portion 40 of the insulator 4.
The 1 st wire 50a is hung on the protruding portion 41 of the insulator 4 and is disposed on the left side of the 1 st external tooth portion 323. In fig. 6, the 1 st to 4 th wires 50a to 50d are drawn loosely for the purpose of defining the connection source and the connection destination, but are actually hung on the protruding portion 41 in a state where tension is applied. That is, by attaching the 1 st wire 50a to the protruding portion 41 and applying a certain tension to the wire, the loosening of the already formed winding layer of the inner coil portion 51 can be suppressed. In order to suppress the slack, the 1 st wire 50a may be wound around the protruding portion 41 for 1 or several weeks. Hereinafter, the 2 nd wire 50b, the 3 rd wire 50c, and the 4 th wire 50d may be wound around the protruding portion 41 in the same manner.
Then, the 1 st wire 50a is pulled to the left of the radially inner end of the 1 st external tooth portion 323. The wire continuing from the 1 st wire 50a starts to wind from the left side of the radially inner end portion of the 1 st external tooth portion 323 to the 1 st external tooth portion 323 covered with the insulator 4. In the 1 st external tooth portion 323, the wire is wound around the counterclockwise direction like the inner coil portion 51.
Then, the wire is wound around the 1 st external tooth portion 323 once in the radial direction. Thus, the 1 st outer coil portion 52 having 2 winding layers is formed in the 1 st outer tooth portion 323.
The wire wound around the 1 st outer coil portion 52 is led out from the right side of the 1 st outer tooth portion 323 to the upper surface of the cover portion 40 of the insulator 4 as the 2 nd wire 50 b. The 2 nd wire 50b is pulled to the right of the radially inner end of the 2 nd external tooth portion 324 after being hung on the protruding portion 41.
The wire continuing from the 2 nd wire 50b starts winding from the right side of the radially inner end portion of the 2 nd external tooth portion 324 to the 2 nd external tooth portion 324 covered with the insulator 4. In the 2 nd external tooth portion 324, the wire is wound around the inner coil portion 51 in the clockwise direction. Then, the wire is wound once back in the radial direction in the 2 nd external tooth portion 324. Thereby, the 2 nd outer coil part 53 having 2-layer winding layers is formed on the 2 nd outer tooth part 324.
The wire wound around the 2 nd outer coil portion 53 is led out from the left side of the 2 nd external tooth portion 324 as the 3 rd wire 50c to the upper surface of the cover portion 40 of the insulator 4. The 3 rd wire 50c is pulled to the left of the radially inner end of the 3 rd external tooth portion 325 after being hung on the protruding portion 41.
The wire continuing from the 3 rd wire 50c starts winding from the left side of the radially inner end portion of the 3 rd external tooth portion 325 to the 2 nd external tooth portion 324 covered with the insulator 4. In the 3 rd external tooth portion 325, the wire is wound around the counterclockwise direction as in the inner coil portion 51. Then, the wire is wound once back in the 3 rd external tooth portion 325 in the radial direction. Thereby, the 3 rd outer coil part 54 having 2 winding layers is formed on the 3 rd outer tooth part 325.
The wire wound around the 3 rd outer coil portion 54 is led out from the right side of the 3 rd external tooth portion 325 as the 4 th wire 50d to the upper surface of the cover portion 40 of the insulator 4. The 4 th wire 50d is pulled to the left of the radially outer end of the inner tooth 321 after being hung on the protruding portion 41.
The wire continuing from the 4 th wire 50d starts winding from the left side of the radially outer end portion of the internal tooth portion 321 around the internal tooth portion 321 covered with the insulator 4. In the internal tooth portion 321, the wire is wound around the counterclockwise direction. Then, the wire winding advances to the radially inner side. Thereby, the inner coil portion 51 having 4 winding layers is formed on the inner tooth portion 321.
By hanging the wires on the protruding portion 41 of the insulator 4, the lap wirings 50a, 50b, 50c, 50d are easily formed to cross the inner coil portion 51, the outer coil portion 52, and the outer coil portions 52 and 53, and 54 each other.
In the coil portion 5, the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are formed by 1 wire. That is, the inner coil portion 51 and the plurality of outer coil portions 52, 53, 54 are formed of 1 wire.
When the wire is stretched between the coil portions, the wire is caught by the protruding portion 41, thereby suppressing winding disorder such as loosening of the wire in each coil portion. Further, by winding the wire as described above, both the winding start side end and the winding end side end of the wire can be positioned radially inward of the tooth portion 32. This facilitates the mounting work of the lead wires on the wiring board 7.
As described above, in the coil portion 5, the inner coil portion 51, the 1 st outer coil portion 52, and the 3 rd outer coil portion 54 are wound around the counterclockwise direction. On the other hand, the 2 nd coil portion 53 is wound in the clockwise direction. That is, the winding directions of the wires of the outer coil portions 323, 324, 325 adjacent in the circumferential direction are mutually opposite directions. Each tooth portion 32 has 1 internal tooth portion 321 and 3 external tooth portions 323, 324, 325 arranged in the circumferential direction. The winding direction of the wire of the outer coil portion 53 disposed at the center in the circumferential direction is opposite to the winding direction of the wire of the inner coil portion 51.
By configuring the tooth portion 32 in this manner, the flow of the magnetic force generated by the inner coil portion 51 and the outer coil portions 52, 53, 54 can be made smooth. This can increase the output torque of the motor 200.
< 4.6 Wiring Board 7 >)
The motor 200 has a wiring board 7, and the wiring board 7 is formed with wiring for supplying current to the coil portion 5. As shown in fig. 2, the wiring board 7 is disposed axially below the stator 2. As described above, in the stator 2, the winding layers of the inner coil portion 51 are larger than the winding layers of the outer coil portions 52, 53, 54. Therefore, in the stator 2, the thickness of the radially outer side is thinner than that of the inner side. That is, a gap is formed between the lower portions of the outer coil portions 52, 53, 54 and the impeller housing 301 axially below the stator 2. The wiring board 7 is disposed in the gaps below the outer coil portions 52, 53, 54.
By disposing the wiring board 7 axially below the outer coil portions 52, 53, 54, the electronic components are accommodated in the gaps between the lower portions of the outer coil portions 52, 53, 54 and the impeller housing 301, and therefore the axial thickness of the motor 200 can be suppressed to be small. This makes it possible to reduce the thickness of the motor 200 in the axial direction. A detection element such as a hall element or a hall sensor is mounted on the wiring board 7 to detect magnetism of the rotor magnet 13 of the rotor 1 to detect a rotation angle (speed) of the rotor 1. Since the wiring board 7 is arranged radially outward of the stator 2, the detection element can be arranged in the vicinity of the rotor magnet 13. This enables the position of the rotor 1 to be detected with high accuracy.
< 4.7 details of Motor 200 >
As shown in fig. 2, the rotor 1 is mounted to the rotor mounting portion 307 of the impeller housing 301. The rotor 1 may be fixed to the rotor mounting portion 307 by pressing the rotor housing 12 into the rotor mounting tube portion 309 of the rotor mounting portion 307, or may be fixed by a fixing method such as adhesion or welding.
After the wiring board 7 is mounted on the base portion 101 of the post 100, the stator 2 is mounted on the post 100. Then, the impeller housing 301 is rotatably mounted on the support column 100 provided with the stator 2 and the wiring board 7 via the bearing 6. At this time, the rotor magnet 13 is radially opposed to the external teeth 323, 324, 325 of the teeth 32 of the stator 2.
Then, by supplying current to the coil portion 5, the inner coil portion 51, the 1 st outer coil portion 52, the 2 nd outer coil portion 53, and the 3 rd outer coil portion 54 are excited. The rotor 1 rotates by attraction and repulsion between the outer coil portions 52, 53, 54 and the rotor magnet 13.
< 4.8 excitation of coil portion 5 >
The state of the magnetic force when the current flows in the coil portion 5 having the winding direction shown above will be described with reference to the drawings. Fig. 7 is a diagram showing the flow of magnetic force generated when current flows in the inner coil portion and the outer coil portion of the tooth portion. In fig. 7, the flow of magnetic force is indicated by arrows. A magnetic force is generated by supplying current to the coil part 5. In fig. 7, a current flowing from the 1 st outer coil portion 52 to the 2 nd outer coil portion 53 is provided. Thereby, the inner coil portion 51, the 1 st outer coil portion 52, and the 3 rd outer coil portion 54 are excited to the N-pole radially inward side. The outer side of the 2 nd coil portion 53 in the radial direction is excited to the N pole.
In the connecting portion 322, the portion where the internal tooth portion 321 and the 2 nd external tooth portion 324 are connected is an S-pole. In the connecting portion 322, the portion where the 1 st external tooth portion 323 and the 3 rd external tooth portion 325 are connected is an N-pole. The magnetic beam flows from the N pole toward the S pole. Therefore, in the coupling portion 322, the magnetic force flows from the portion where the 1 st external tooth portion 323 and the 3 rd external tooth portion 325 are connected toward the portion where the internal tooth portion 321 and the 2 nd external tooth portion 324 are connected. As shown in fig. 7, in the tooth portion 32, the flow of the magnetic force is symmetrical about the center line. Here, symmetry also includes substantial symmetry.
The tooth portion 32 has 2 teeth arranged in the radial direction on the inner tooth portion 321 and the outer tooth portions 323, 324, 325. This can narrow the intervals between the external teeth 323, 324, 325 arranged on the outer peripheral portion of the stator 2. Therefore, the teeth can be increased without increasing the outer diameter of the stator core 3. This increases the number of windings of the coils of each phase, and can increase the output torque of the motor 200 without increasing the size of the stator 2 (motor 200).
Further, by winding the wire around only the 2 nd outer coil portion 53 formed in the 2 nd outer tooth portion 324, which is the outer tooth portion on the inner side in the circumferential direction of the 3 outer tooth portions, in a direction different from the inner coil portion 51, the flow of the magnetic force in the connecting portion 322 of the tooth portion 32 can be adjusted. That is, when the stator core 3 is used, the magnetic force generated in the inner coil portion 51 can be effectively utilized, and the magnetic force generated in the coil portion 5 formed in the tooth portion 32 can be improved. This can improve the output torque of the motor 200.
In the tooth portion 32, the coupling portion 322 includes an inclined portion 3221. This allows the magnetic force flowing through the coupling portion 322 to smoothly flow, and prevents leakage of the magnetic force to the outside of the tooth portion 32. Therefore, the magnetic force generated in the coil portion 5 can be efficiently utilized. This can improve the output torque of the motor 200.
In the stator according to the present embodiment, the number of windings of teeth can be increased without increasing the outer diameter of the stator core. In this way, in the case of motors having the same outer shape, a larger torque can be output by using the stator of the present embodiment. In addition, in the case of a motor that outputs the same torque, the stator can be miniaturized, and therefore the motor itself can be miniaturized.
That is, by using the stator of the present embodiment, the output torque can be increased without increasing the outer shape of the motor. In addition, the motor can be miniaturized while maintaining the output torque.
< 5 modified examples etc. >)
A modification of the stator of the present invention will be described with reference to the drawings. Fig. 8 is a plan view showing a modification of the stator core. The structure of the core back 31a of the stator core 3a shown in fig. 8 is different from the core back 31 of the stator core 3. Otherwise, the stator core 3 has the same structure as that shown in fig. 5 and the like. Therefore, in the stator core 3a, substantially the same portions as those of the stator core 3 are denoted by the same reference numerals, and detailed description of the same portions is omitted.
The core back 31a of the stator core 3a shown in fig. 8 has the same number as the teeth 32, that is, 9 divided core backs 312 which are divided. The split core back 312 is formed of the same member as the tooth 32. The member including the tooth 32 and the split core back 312 is defined as the split core 33. The 1 split core back 312 is connected to the 1 tooth 32, but the present invention is not limited thereto. For example, 1 split core back 312 may be connected to a plurality of teeth 32.
That is, the core back 31a is formed by connecting a plurality of divided core backs 312 in the circumferential direction, and at least 1 tooth portion 32 is connected to the radially outer side of the divided core back 312.
The stator core 3a is formed by combining 9 split cores 33 in the circumferential direction. The stator core 3a can be divided into 9 divided cores 33. By configuring the tooth portion 32 to include the internal tooth portion 321, the connecting portion 322, the 1 st external tooth portion 323, the 2 nd external tooth portion 324, and the 3 rd external tooth portion 325, the number of coupling portions of the split cores can be reduced as compared with the case where the stator core is split for each tooth. This can reduce errors due to the accumulation of dimensional tolerances and improve productivity.
The motor of the present invention can be widely used not only as an air blower but also as a power source for rotating a rotary body.
The embodiments of the present invention have been described above, but the present invention is not limited to this. The embodiment of the present invention can be variously modified without departing from the gist of the present invention.
Industrial applicability
The air supply device can be used for a circulator. Further, the present invention can be used, for example, as a power source for an unmanned aerial vehicle. And, in addition to this, it is widely applicable to an apparatus using an air flow generating an axial flow. The motor of the present invention can be used as a power source for supplying a rotational force to the outside, in addition to the blower.
Claims (10)
1. A stator, comprising:
a stator core; and
a coil part formed by winding a wire around a part of the stator core,
wherein,,
the stator core has:
the back of the annular iron core; and
a plurality of teeth connected to the core back on the radial outer side and arranged in the circumferential direction,
each of the teeth has:
an inner tooth portion extending radially outward from a radially outer surface of the core back portion;
a connecting portion connected to a radially outer end portion of the internal tooth portion and extending in a circumferential direction; and
3 or more external teeth portions extending radially outward from a radially outer surface of the coupling portion and arranged in a circumferential direction,
the coil part has:
an inner coil part formed by winding a wire around the inner tooth part; and
a plurality of outer coil portions formed by winding a wire around the outer teeth portion,
in each of the tooth portions, the inner coil portion and the plurality of outer coil portions are formed of 1 wire,
more than 3 of the external tooth parts have a 1 st external tooth part, a 2 nd external tooth part and a 3 rd external tooth part,
the coil portion is formed by winding a wire around the internal tooth portion, the 1 st external tooth portion, the 2 nd external tooth portion, and the 3 rd external tooth portion, respectively.
2. The stator of claim 1, wherein,
the winding directions of the wires of the outer coil portions adjacent in the circumferential direction are mutually opposite directions.
3. The stator according to claim 1 or 2, wherein,
the number of the inner tooth parts is smaller than the number of the outer tooth parts.
4. The stator according to claim 1 or 2, wherein,
each of the teeth has 1 of the internal teeth,
the 1 st external tooth part, the 2 nd external tooth part and the 3 rd external tooth part are arranged along the circumferential direction,
the winding direction of the wire of the outer coil part arranged at the center in the circumferential direction is the direction opposite to the winding direction of the wire of the inner coil part.
5. The stator according to claim 1 or 2, wherein,
the connecting portion has inclined portions at both circumferential ends thereof, the inclined portions being inclined toward the radially inner side toward the central side in the circumferential direction of the connecting portion.
6. The stator according to claim 1 or 2, wherein,
the core back is formed by connecting a plurality of divided core backs in the circumferential direction,
at least 1 tooth part is connected to the radial outer side of the back of the split iron core.
7. The stator according to claim 1 or 2, wherein,
the stator also has an insulator covering the stator core,
the insulator covers at least one of axial end surfaces of the connecting portion of the stator core,
the insulator has a protruding portion protruding in an axial direction in a portion covering the coupling portion.
8. The stator according to claim 1 or 2, wherein,
the inner coil part and the outer coil part are each formed by winding a wire in a plurality of layers,
the number of layers of windings of the inner coil portion is greater than the number of layers of windings of the outer coil portion.
9. A motor, comprising:
the stator of any one of claims 1 to 8; and
and a rotor which is radially opposed to the stator and is rotatably supported with respect to the stator.
10. An air blowing device, comprising:
the motor of claim 9; and
an impeller mounted to the rotor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-093482 | 2019-05-17 | ||
| JP2019093482A JP7255348B2 (en) | 2019-05-17 | 2019-05-17 | Stator, motor and blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111953114A CN111953114A (en) | 2020-11-17 |
| CN111953114B true CN111953114B (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010395637.0A Active CN111953114B (en) | 2019-05-17 | 2020-05-12 | Stator, motor and air supply device |
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| Country | Link |
|---|---|
| JP (1) | JP7255348B2 (en) |
| CN (1) | CN111953114B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818137A (en) * | 1995-10-26 | 1998-10-06 | Satcon Technology, Inc. | Integrated magnetic levitation and rotation system |
| JP2001186695A (en) * | 1999-12-24 | 2001-07-06 | Fujitsu General Ltd | Induction motor |
| JP2003153514A (en) * | 2001-11-15 | 2003-05-23 | Matsushita Electric Ind Co Ltd | Brushless motor |
| JP2013247763A (en) * | 2012-05-25 | 2013-12-09 | Panasonic Corp | Motor and ceiling fan mounted therewith |
| CN103795159A (en) * | 2014-01-03 | 2014-05-14 | 东南大学 | Stator-rotor double-permanent-magnet-type-vernier motor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3217194A (en) * | 1961-05-16 | 1965-11-09 | Phelon Co Inc | Electrical generator of the inductor type |
| US4260925A (en) * | 1978-04-17 | 1981-04-07 | Barrett Edward L | Stator for an electromagnetic transducer |
| DE19838335A1 (en) * | 1998-08-24 | 2000-03-02 | Bosch Gmbh Robert | Stator for an electric drive motor |
| JP2001112226A (en) * | 1999-10-08 | 2001-04-20 | Moriyama Manufacturing Co Ltd | Three phase magnet generator |
| JP2003284305A (en) * | 2002-03-20 | 2003-10-03 | Japan Servo Co Ltd | Three-phase brushless motor with inductor type core armature |
| JP2010093930A (en) * | 2008-10-07 | 2010-04-22 | Nsk Ltd | Electric motor |
| JP5576076B2 (en) * | 2009-09-02 | 2014-08-20 | アスモ株式会社 | DC motor and method of manufacturing DC motor |
| JP5408277B2 (en) * | 2012-03-07 | 2014-02-05 | パナソニック株式会社 | Induction motor and ceiling fan equipped with the same |
| JP6216631B2 (en) * | 2013-12-02 | 2017-10-18 | アスモ株式会社 | Armature and rotating machine |
-
2019
- 2019-05-17 JP JP2019093482A patent/JP7255348B2/en active Active
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2020
- 2020-05-12 CN CN202010395637.0A patent/CN111953114B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818137A (en) * | 1995-10-26 | 1998-10-06 | Satcon Technology, Inc. | Integrated magnetic levitation and rotation system |
| JP2001186695A (en) * | 1999-12-24 | 2001-07-06 | Fujitsu General Ltd | Induction motor |
| JP2003153514A (en) * | 2001-11-15 | 2003-05-23 | Matsushita Electric Ind Co Ltd | Brushless motor |
| JP2013247763A (en) * | 2012-05-25 | 2013-12-09 | Panasonic Corp | Motor and ceiling fan mounted therewith |
| CN103795159A (en) * | 2014-01-03 | 2014-05-14 | 东南大学 | Stator-rotor double-permanent-magnet-type-vernier motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020188645A (en) | 2020-11-19 |
| CN111953114A (en) | 2020-11-17 |
| JP7255348B2 (en) | 2023-04-11 |
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