CN110661350B - Motor - Google Patents

Motor Download PDF

Info

Publication number
CN110661350B
CN110661350B CN201910571573.2A CN201910571573A CN110661350B CN 110661350 B CN110661350 B CN 110661350B CN 201910571573 A CN201910571573 A CN 201910571573A CN 110661350 B CN110661350 B CN 110661350B
Authority
CN
China
Prior art keywords
circuit board
motor
stator
core back
axial direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910571573.2A
Other languages
Chinese (zh)
Other versions
CN110661350A (en
Inventor
石田亮介
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Publication of CN110661350A publication Critical patent/CN110661350A/en
Application granted granted Critical
Publication of CN110661350B publication Critical patent/CN110661350B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • 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
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
    • H02K2211/03—Machines characterised by circuit boards, e.g. pcb
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • 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

Abstract

Provided is a motor including a rotor having a shaft extending along a center axis, a stator facing the rotor in a radial direction, a bearing supporting the shaft to be rotatable, an insulating member covering a part of the stator, and a circuit board arranged to be axially spaced apart from a lower portion of the stator, wherein the stator includes a stator core including an annular core back portion and a plurality of teeth, and a coil formed of a conductive wire, and the insulating member includes: an iron core back coating part which covers the iron core back; and a protruding portion extending radially outward from the core back coating portion, the protruding portion including a mounting portion that is located radially outward of an outer edge of the circuit board when viewed in an axial direction and that is fixed to an external device.

Description

Motor
Technical Field
The present invention relates to a motor.
Background
In a conventional motor, a portion for mounting to an external device is provided on the outer periphery of a stator core or a housing covering the stator core. For example, in a stator for a rotating electric machine described in patent document 1, three tongue-shaped mounting portions that protrude radially outward are formed at one end in the axial direction of a stator core, and these mounting portions include through holes for fixing cover members by bolts.
Patent document 1: japanese laid-open patent publication No. 2010-136571
However, when the stator core itself includes the mounting portion, the shape of the stator core becomes complicated, and high-level technology is required for manufacturing. Further, by providing the mounting portion, the weight of the stator core increases.
Disclosure of Invention
The invention aims to provide a motor which has a simple structure and is light in weight.
An exemplary motor of the present invention includes a rotor, a stator, a bearing, an insulating member, and a circuit board. The rotor has a shaft extending along a central axis extending up and down. The stator is radially opposed to the rotor. The stator includes a stator core including an annular core back portion and a plurality of teeth extending radially inward from a radially inner peripheral portion of the core back portion, and a coil formed of a conductive wire having an end portion connected to the circuit board. The bearing rotatably supports the shaft. The insulating member covers a portion of the stator. Further, the insulating member includes: an iron core back coating part which covers the iron core back; and a projection extending radially outward from the core back coating portion. The protruding portion includes a mounting portion that is located radially outward of an outer edge of the circuit board when viewed in the axial direction and that is fixed to the external device.
According to the motor of the exemplary invention, a motor having a simple structure and reduced weight can be provided.
Drawings
Fig. 1 is a perspective view of a motor according to the present embodiment.
Fig. 2 is a perspective view of the motor shown in fig. 1 as viewed from the lower side.
Fig. 3 is a cross-sectional view taken along a plane including the central axis of the motor shown in fig. 1.
Fig. 4 is an exploded perspective view of the motor shown in fig. 1.
Fig. 5 is a cross-sectional perspective view of the stator core and the insulating member.
Fig. 6 is a perspective view of the stator and the insulating member.
Fig. 7 is a bottom view of the stator and the insulating member shown in fig. 6.
Fig. 8 is a bottom view of another example of the stator and the insulating member.
Fig. 9 is a bottom view of the motor.
Fig. 10 is an enlarged perspective view of the convex portion.
Fig. 11 is an enlarged view of the leg portion and the extension portion.
Fig. 12 is a schematic cross-sectional view of an air blower as an external device using the motor of the present embodiment.
Description of the reference symbols
1: a rotor; 2: a stator; 3: an insulating member; 4: an upper plate; 5: a circuit board; 6: an impeller; 7: a wind tunnel portion; 11: a shaft; 12: a rotor housing; 13: a molding part; 14: a rotor magnet; 21: a stator core; 22: a coil; 31: an iron core back cladding portion; 32: a tooth coating portion; 33: a holding section; 34: a convex portion; 35: an installation part; 36: a leg portion; 37: an extension portion; 38: a guide section; 41: a beam section; 42: an upper bearing holding part; 43: a pillar section; 50: a through hole; 51: a circuit board recess; 61: an impeller cup; 62: a blade; 70I: the air inlet side is opened; 70X: the exhaust side is open; 71: a fixing protrusion; 211: the back of the iron core; 212: teeth; 331: a barrel portion; 332: a connecting portion; 340: an upper surface; 351: mounting through holes; 352: a hole portion; 353: a groove part; 354: a notch; 361: a substrate fixing portion; 362: an inclined portion; 363: a contact portion; 371: a first extension portion; 372: a second extension portion; 373: a first recess; 374: a second recess; 381: an inclined surface; 421: an upper shaft through hole; 431: a first plate; 432: a second plate; 433: a plate through hole; 501: a recess; 2111: a radially outer surface; 2121: a flange portion; 2122: a radially inner surface; 333: a bottom; 334: a protrusion; 335: a rib; 3321: a first connecting portion; 3322: a second coupling portion; a: a motor; bb: a pin; br 1: a lower bearing; br 2: an upper side bearing; bt: a fastener; br 1: a lower bearing; br 2: an upper side bearing; c: a central axis; f: an external device; GL: and a ground line.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, in the motor a, a direction parallel to the central axis C of the motor a is referred to as an "axial direction", a direction perpendicular to the central axis C of the motor a is referred to as a "radial direction", and a direction along an arc centered on the central axis C of the motor a is referred to as a "circumferential direction". In the present specification, the motor a is defined as "up-down" with the axial direction as the up-down direction and the up-down direction in fig. 3 as the reference. The "upper" and "lower" are directions defined for ease of explanation, and do not limit the actual installation state of the motor a. Further, the direction of action of gravity may not coincide vertically.
< 1. integral Structure of Motor >
Fig. 1 is a perspective view of a motor according to an embodiment. Fig. 2 is a perspective view of the motor shown in fig. 1 as viewed from a lower side. Fig. 3 is a cross-sectional view taken along a plane including the central axis of the motor shown in fig. 1. Fig. 4 is an exploded perspective view of the motor shown in fig. 1. Fig. 5 is a cross-sectional perspective view of the stator core and the insulating member. Fig. 6 is a perspective view of the stator and the insulating member. Fig. 7 is a bottom view of the stator and the insulating member shown in fig. 6. Fig. 8 is a bottom view of another example of the stator and the insulating member. Fig. 9 is a bottom view of the motor. Fig. 10 is an enlarged perspective view of the convex portion. Fig. 11 is an enlarged view of the leg portion and the extension portion. Fig. 12 is a schematic cross-sectional view of an air blower as an external device using the motor of the present embodiment.
As shown in fig. 1 to 4, the motor a includes a rotor 1, a stator 2, an insulating member 3, an upper plate 4, and a circuit board 5. A part of the stator 2 is covered with an insulating member 3. A circuit board 5 is provided axially below the stator 2. The rotor 1 is rotated by supplying electric power from the circuit board 5 to a coil 22, described later, provided in the stator 2. In the motor a, the rotor 1 is disposed radially inside the stator 2. That is, the motor a is an inner rotor type motor. The motor a includes a rotor 1, a stator 2, a bearing Br1, an insulating member 3, and a circuit board 5. Hereinafter, each part of the motor a will be described in detail.
< 1.1 > As for rotor 1
As shown in fig. 3 and 4, the rotor 1 includes a shaft 11, a rotor case 12, a molded portion 13, and a rotor magnet 14. The rotor 1 has a shaft 11 extending along a central axis extending in the up-down direction. The shaft 11 is cylindrical extending along the central axis. The rotor case 12 is a cylindrical body extending in the axial direction along the center axis C. The shaft 11 penetrates the center of the rotor case 12 (see fig. 3).
The mold portion 13 is a resin molded body. The mold 13 is provided between the shaft 11 and the rotor case 12. The mold 13 fixes the shaft 11 and the rotor case 12. Also, the molded portion 13 maintains a radial interval of the shaft 11 from the rotor case 12.
The N poles and S poles of the rotor magnets 14 are alternately arranged in the circumferential direction. The rotor magnet 14 is cylindrical. The rotor magnet 14 is fixed to the radially outer side of the rotor case 12. The rotor magnet 14 is a cylindrical body obtained by integrally molding a resin mixed with magnetic powder. Further, N poles and S poles are alternately magnetized to the rotor magnet 14. The rotor magnet 14 may be fixed to the rotor case 12 by press fitting, adhesion, or the like. In addition, when the mold portion 13 is molded, the rotor magnet 14 may be fixed to the rotor case 12 by the mold portion 13. Further, as the rotor magnet 14, a single ring-shaped magnet is used, but a plurality of magnets may be fixed to the outer surface of the rotor case 12.
The shaft 11 of the rotor 1 is attached to a lower bearing Br1 held by the insulating member 3 and an upper bearing Br2 held by the upper plate 4. Thus, the bearings Br1 and Br2 rotatably support the shaft 11. That is, the shaft 11 and the rotor 1 including the shaft 11 are supported to be rotatable with respect to the stator 2 and the insulating member 3.
< 1.2 regarding stator 2 >
As shown in fig. 5 to 7, a part of the stator 2 is covered with the insulating member 3. The stator 2 is radially opposed to the rotor 1. The stator 2 includes a stator core 21 and a coil 22.
< 1.2.1 about stator core 21 >
The stator core 21 may be a laminate in which magnetic plates are laminated in the axial direction, or may be a molded body formed as the same component by sintering powder, for example. The stator core 21 includes a core back 211 and a plurality of teeth 212. The core back 211 is annular.
The plurality of teeth 212 extend radially inward from a radially inner peripheral portion of the core back 211. That is, the stator 2 includes a stator core 21, and the stator core 21 includes an annular core back 211 and a plurality of teeth 212 extending radially inward from a radially inner peripheral portion of the core back 211. The plurality of teeth 212 are arranged at equal intervals in the circumferential direction. A flange portion 2121 expanding in the circumferential direction is provided radially inside the teeth 212. A radially inner surface 2122 of the flange 2121 is curved about the central axis, and the flange 2121 and the rotor magnet 14 of the rotor 1 are radially opposed to each other with a gap therebetween. Here, the stator core 21 includes four teeth 212. That is, the stator core 21 has four slots. That is, the motor a of the present embodiment is an ac motor.
< 1.2.2 > regarding the coil 22
The coil 22 is formed by winding a wire around the teeth 212 covered with the later-described tooth covering portion 32 of the insulating member 3. That is, the tooth coating portion 32 covers the teeth 212 and the wire is wound. The coils 22 are formed on the four teeth 212, respectively. The four coils 22 are connected to each other. That is, the coil 22 is formed by connecting wires into one piece. Also, both ends of the wire forming the coil 22 are connected to the circuit board 5. In the motor a of the present embodiment, the end of the coil 22 is connected to a pin Bb arranged in a linear manner as a rod. The pin Bb is connected to the circuit board 5, and the end of the coil 22 is electrically connected to the circuit board 5. That is, the coil 22 is formed of a wire, and an end of the wire is connected to the circuit board 5.
< 1.3 > As for the insulating part 3
The insulating member 3 covers a part of the stator 2. The insulating member 3 includes a core back coating portion 31, a tooth coating portion 32, a holding portion 33, and a projection 34. The insulating member 3 is made of a material having insulating properties such as resin and easy to mold. As shown in fig. 5, the core back coating portion 31 covers the core back 211 of the stator 2.
< 1.3.1 > about the core back cladding 31
As shown in fig. 5 and the like, the core back coating portion 31 covers upper and lower portions of the core back 211 in the axial direction. Further, the core back coating portion 31 also covers the radially inner peripheral portion of the core back 211 between the adjacent teeth 212. That is, the core back cover 31 covers the upper and lower portions of the core back 211 in the axial direction and the radially inner peripheral portion between the teeth 212. The radially outer surface 2111 of the core back 211 is exposed to the outside of the insulating member 3. That is, at least a part of the radially outer surface of the core back 211 is exposed to the outside of the insulating member 3.
Accordingly, when the motor a is driven, heat generated in the stator core 21 and the coil 22 is easily released to the outside from the radially outer surface 2111. As will be described in detail later, the motor a rotates the impeller 6 for blowing air. The air flow (airflow) generated by the rotation of the impeller 6 flows in the axial direction along the radially outer surface 2111 of the core back 211. The radially outer surface 2111 is exposed from the insulating member 3 through the radially outer surface 2111, and the radially outer surface 2111 is cooled by the airflow. This suppresses the temperature rise of the stator 2 and the motor a as a whole.
< 1.3.2 about the teethed cladding 32 >
The tooth wrap 32 covers at least a portion of the teeth 212. Specifically, the tooth coating portion 32 covers both axial end portions and both circumferential end portions of the teeth 212. That is, the radially inner surface 2122 of the flange portion 2121 of the tooth 212 is not covered by the tooth covering portion 32. This can reduce the gap between the teeth 212 and the rotor magnet 14. The radially inner surface 2122 of the flange 2121 is exposed to the outside of the insulating member 3. This increases the magnetic force acting between the teeth 212 and the rotor magnet 14. As is apparent from the above description, the rotation efficiency of the motor a can be improved.
The tooth coating portion 32 is a molded body molded from the same member as the core back coating portion 31. This can suppress the number of components.
< 1.3.3 > regarding the holding portion 33
The holding portion 33 extends along the central axis from the axial lower end of the core back coating portion 31. The holding portion 33 holds the lower bearing Br 1.
The holding portion 33 includes a tube portion 331 and a coupling portion 332. The cylindrical portion 331 has a cylindrical shape extending parallel to the central axis. As shown in fig. 3 and the like, the radially inner surface of the cylindrical portion 331 holds the radially outer surface of the outer ring of the lower bearing Br 1. The lower bearing Br1 is a ball bearing, and balls are arranged between the outer ring and the inner ring.
The outer ring is held by the cylindrical portion 331, and the lower bearing Br1 is fixed to the holding portion 33. Thereby, the center of the lower bearing Br1 overlaps with the central axis C. Further, a shaft 11 is fixed to an inner ring of the lower bearing Br 1. Thereby, the shaft 11 is rotatably supported by the lower bearing Br 1.
The outer ring of the lower bearing Br1 is fixed by being press-fitted into the cylindrical portion 331, for example. But is not limited thereto. The outer ring of the lower bearing Br1 may be fixed to the cylindrical portion 331 by welding, bonding, or the like, and a method of accurately overlapping and fixing the center of the lower bearing Br1 with the central axis C can be widely used. In the present embodiment, a ball bearing is used as the lower bearing Br1, but the present invention is not limited to this. A bearing capable of rotatably supporting the shaft 11 can be widely used.
The cylindrical portion 331 includes a bottom portion 333 and a protruding portion 334. The bottom 333 extends from the lower end of the cylindrical portion 331 in the axial direction toward the center axis C. The bottom 333 is flat and perpendicular to the center axis C. The protruding portion 334 protrudes axially downward from the lower surface of the bottom portion 333. As shown in fig. 2, 3, and the like, the protruding portion 334 has a cylindrical shape, and the center thereof overlaps the central axis C. That is, the protruding portion 334 extends axially downward from the radially central portion of the bottom portion 333. Further, the details will be described later, whereby the positioning of the circuit board 5 in the radial direction can be performed.
The projection 334 further includes a rib 335 extending in the axial direction on the radially outer surface. As will be described in detail later, the circuit board can be positioned in the circumferential direction.
The coupling portion 332 connects the core back coating portion 31 and the tube portion 331. As shown in fig. 7, in the insulating member 3, four coupling portions 332 couple the core back coating portion 31 and the tube portion 331. The coupling portions 332 are disposed at equal intervals, so that vibration, and the like of the shaft 11 can be suppressed. Therefore, the rotation accuracy of the motor a can be improved. In the present embodiment, the holding portion 33 is configured to have the coupling portion 332 in a thin plate shape when viewed in the axial direction, but the present invention is not limited to this. For example, the stator 2 may have an annular shape covering the lower portion in the axial direction.
In the present embodiment, the number of the coupling portions 332 is the same as the number of the teeth 212. If the number of coupling portions 332 is the same as the number of teeth 212, the cylindrical portion 331 can be firmly fixed by the coupling portions 332 while suppressing the insulating member 3 from having a complicated structure.
The coupling portion 332 includes a first coupling portion 3321 and a second coupling portion 3322. The first connecting portion 3321 extends in the axial direction from the axial lower end portion of the core back coating portion 31. The second coupling portion 3322 extends radially inward from the axial lower end of the first coupling portion 3321.
Since the coupling portion 332 includes the first coupling portion 3321, the tube portion 331 can be disposed away from the axis downward. This can increase the axial lengths of the lower bearing Br1 and the upper bearing Br2, thereby improving the rotational accuracy of the shaft 11. Further, the distance between the circuit board 5 and the stator 2 can be increased. This makes the circuit board 5 and the electronic components mounted on the circuit board 5 less susceptible to the heat of the stator 2. Further, a space is provided around the teeth 212. Therefore, the heat of the stator 2 can be dissipated from the space to the outside.
The first coupling portion 3321 and the second coupling portion 3322, that is, the coupling portion 332 are disposed between the teeth 212 adjacent to each other in the circumferential direction when viewed in the axial direction. This allows insertion of a jig, a mechanical device, or the like when winding the wire around the teeth 212. That is, it is easy to secure a space for winding the coil. Therefore, the formation of the coil 22 becomes easy. Further, among the respective portions of the insulating member 3, there is no portion overlapping in the axial direction as viewed in the axial direction. Therefore, the insulating member 3 can be molded by a die pulled out upward in the axial direction and a die pulled out downward in the axial direction. This can simplify the mold, and can reduce the time and labor required for manufacturing the insulating member 3.
Further, as shown in fig. 7 and the like, the second coupling portion 3322 couples the axial lower end of the first coupling portion 3321 to the cylindrical portion 331. The first coupling portion 3321 and the second coupling portion 3322 have the same width in the circumferential direction. Further, the circumferential widths of the first coupling portion 3321 and the second coupling portion 3322 are smaller than the interval between the flange portions 2121 of the teeth 212 adjacent in the circumferential direction. By making the width of the coupling portion 332 narrow, the length in the circumferential direction of the insulating member covering the radially inner end portion of the tooth 212 extending in the circumferential direction can be made long. This enables more wire to be wound around the teeth 212. Therefore, the degradation of the characteristics of the motor a can be suppressed.
< 1.3.4 > about the convex portion 34 >
As shown in fig. 5, 7, and the like, the plurality of projections 34 extend radially outward from the core back coating portion 31. That is, the insulating member 3 includes: a core back coating portion 31 that covers the core back 211; and a convex portion 34 extending radially outward from the core back cover portion 311. The projection 34 has a portion located radially outward of the outer edge of the circuit board 5 when viewed in the axial direction. The projection 34 includes a mounting portion 35. In the present embodiment, the insulating member 3 includes a pair of protrusions 34. The pair of projections 34 are axisymmetric with respect to the center axis C.
< 1.3.5 regarding the mounting portion 35 >
The mounting portion 35 is provided at a portion of the convex portion 34 radially outward of the outer edge of the circuit board 5. The mounting portion 35 is fixed to an external device F described later. That is, the projecting portion 34 includes a mounting portion 35, and the mounting portion 35 is positioned radially outward of the outer edge of the circuit board 5 when viewed from the axial direction and is fixed to the external device F.
As shown in fig. 12, the fixing member is, for example, a screw Sc. The mounting portion 35 includes a mounting through hole 351 through which the screw Sc passes. That is, the mounting portion 35 includes a mounting through hole 351 that penetrates in the axial direction. Thus, the mounting portion 35 is provided with the mounting through hole 351, and can be easily positioned with respect to the external device F and fixed to the external device by screw fixation or the like. As shown in fig. 3, 7, and the like, the upper surface of the projection 34 includes a hole 352 having a diameter larger than that of the mounting through-hole 351 when viewed in the axial direction. Further, mounting portion 35 includes groove 353 extending from the radially outer surface of protruding portion 34 toward hole 352.
As shown in fig. 8, the mounting portion 35 may have a notch 354 recessed inward in the radial direction from the radially outer edge portion. The direction in which the notch 354 is recessed is not limited to the radially inner side, and may be, for example, the circumferential direction. That is, the mounting portion 35 includes a notch 354 recessed in a direction perpendicular to the axial direction. By providing the notch 354 in the mounting portion 35, fine adjustment can be performed in the radial direction and/or the circumferential direction when the external device F is mounted.
< 1.3.6 > about the leg 36 and the extension 37
As shown in fig. 10, the projection 34 includes an extension 37 and a leg 36 projecting from the axially lower end. The leg portion 36 protrudes axially downward from the axial lower end of the projection 34. The axial lower end of the leg portion 36 includes a substrate fixing portion 361. The extending portion 37 extends axially downward from the axial lower end of the projection 34 toward the circuit board 5.
The leg portion 36 has a flat plate shape extending parallel to the axial direction and is elastically deformable. The leg portion 36 has a circumferential width narrower than a radial width. That is, the leg portion 36 can be elastically deformed in the circumferential direction. The substrate fixing portion 361 is disposed at the axial lower end of the leg portion 36. However, the arrangement direction of the leg portions 36 is not limited to the direction shown in fig. 7.
As shown in fig. 9, 10, and the like, the substrate fixing portion 361 protrudes from the axial lower end portion of the leg portion 36 in a direction intersecting the axial direction, i.e., in the circumferential direction. The substrate fixing portion 361 protrudes in a direction in which the leg portion 36 is elastically deformed. The substrate fixing portion 361 includes an inclined portion 362 and a contact portion 363. The contact portion 363 is in contact with the axially lower surface of the circuit board 5. Thus, the insulating member 3 has three functions of insulating the stator core 21 from the coil 22, holding the bearing Br1, and fixing the circuit board 5. Therefore, it is not necessary to provide other components dedicated to each function, and the number of components can be reduced.
The inclined portion 362 has an inclined surface that expands in the circumferential direction as it goes upward from the axially lower portion. The contact portion 363 is disposed at an axial upper end portion of the inclined portion 362. The contact portion 363 has, for example, a plane perpendicular to the central axis C. The leg portion 36 penetrates a circuit board recess 51, which will be described later, of the circuit board 5. Also, the contact portion 363 of the substrate fixing portion 361 contacts an edge portion of the circuit board recess 51. Thereby, the insulating member 3 and the circuit board 5 are fixed. That is, the projection 34 includes: a leg portion 36 that protrudes axially downward and includes a substrate fixing portion 361 that contacts the axially lower surface of the circuit board 5; and an extension portion 37 extending axially downward toward the circuit board. The fixing of the insulating member 3 to the circuit board 5 will be described in detail later. When the circuit board 5 is mounted to the motor a through the substrate fixing portion 361, the circuit board 5 is in contact with the extension portion 37. Thus, the circuit board 5 is positioned in the axial direction. Further, the load applied to the substrate fixing portion 361 can be reduced. This improves workability in assembling the motor a.
The extension 37 includes a first extension 371 and a second extension 372. The first extension 371 is circumferentially adjacent to the leg 36. Also, the second extension 372 is radially adjacent the leg 36. Since the leg portion 36 is disposed adjacent to the extension portion 37, when the circuit board 5 and the insulating member 3 are fixed, a load (stress) concentrated on the leg portion 36 is received by the extension portion 37. Therefore, the inclination of the circuit board 5 due to the load can be suppressed. The lower end surface of the first extension portion 371 and the lower end surface of the second extension portion 372 are in contact with the upper surface of the circuit board 5. In addition, the lower end surface of the first extension portion 371 and the lower end surface of the second extension portion 372 may not contact the circuit board 5, and a gap may be formed between the lower end surface and the circuit board 5. Since the convex portion 34 includes the two extending portions 371 and 372, the load applied to the substrate fixing portion 361 in the circumferential direction and the radial direction can be reduced. This improves the effect of holding the circuit board 5 by the substrate fixing portion 361.
In the case where the lower end surface of the extension portion 37 is in contact with the upper surface of the circuit board 5, the circuit board 5 is pressed in the axial direction by the extension portion 37 when the circuit board 5 is fixed to the insulating member 3. Therefore, the insulating member 3 and the circuit board 5 can be fixed with high accuracy. Further, in the case where the gap is formed, the circuit board 5 is also deformed when the circuit board 5 is fixed to the insulating member 3, so that the circuit board 5 is positioned in the axial direction by being in contact with the lower end surface of the extension portion 37. This improves workability in assembling the motor a. That is, the lower end surface of the extension portion 37 faces the upper surface of the circuit board 5 with a gap therebetween, thereby improving the assembly accuracy and workability of the motor a.
The first extension 371 is adjacent to the axial lower end of the leg 36 via a first recess 373 recessed in the axial direction (see fig. 10). The second extending portion 372 is adjacent to the leg portion 36 via a second recess 374 that is recessed in the axial direction (see fig. 10). That is, the leg portion 36 and the extending portion 37 are adjacent to each other with the recess 373(374) recessed upward in the axial direction interposed therebetween. By providing the recess 373(374), propagation of stress between the leg portion 36 and the extension portion 37 can be suppressed. This can prevent the function from being insufficiently used due to the influence of stress from other portions.
As described above, since the leg portion 36 and the first extension portion 371 are adjacent to each other via the first recess portion 373, the displacement of the leg portion 36, that is, the stress is not easily transmitted to the first extension portion 371 when the leg portion 36 is flexed. Therefore, the first extension 371 is not easily deformed when the leg 36 is elastically deformed. This makes it difficult for the position of the lower end surface of the first extension portion 371 in the axial direction to be displaced, and thus the positioning accuracy of the circuit board 5 in the axial direction can be improved. Moreover, the elastic deformation of the leg portion 36 is not easily hindered by the first extension portion 371.
Similarly, since the leg portion 36 and the second extending portion 372 are adjacent to each other with the second recess 374 interposed therebetween, when the leg portion 36 is flexed, the displacement of the leg portion 36, that is, the stress is hardly transmitted to the second extending portion 372. Therefore, the second extending portions 372 are not easily deformed when the leg portions 36 are elastically deformed. This makes it difficult for the position of the lower end surface of the second extending portion 372 in the axial direction to be displaced, and thus the positioning accuracy of the circuit board 5 in the axial direction can be improved. Also, the elastic deformation of the leg portion 36 is not easily hindered by the second extension portion 372.
As described above, the two convex portions 34 are disposed at positions axially symmetric with respect to the central axis C. The leg portion 36 and the extension portion 37 of each projection 34 are also axially symmetric with respect to the central axis C. That is, the plurality of extending portions 37 and the plurality of leg portions 36 are disposed at symmetrical positions with respect to the center axis C. With this configuration, the circuit board 5 can be fixed more stably by the substrate fixing portion 361. Further, since the circuit board 5 is fixed at a position symmetrical with respect to the central axis C, the inclination of the circuit board 5 with respect to the axis can be suppressed.
< 1.3.7 about the guide 38 >
As shown in fig. 1, 4, and the like, the upper plate 4 is fixed to the upper surface 340 of the projection 34. The upper surface 340 of the projection 34 includes a pair of guide portions 38 arranged in the circumferential direction. That is, the projection 34 further includes a pair of guide portions 38 that axially project from the surface 340 to which the upper plate 4 is fixed and are arranged in the circumferential direction.
As shown in fig. 10, the pair of guide portions 38 have inclined surfaces 381 at axially upper portions. The inclined surfaces 381 of the pair of guide portions 38 have slopes that are away from each other toward the upper side with respect to the other. The inclined surface 381 may be provided on both or one of the pair of guide portions 38. That is, at least one guide portion 38 of the pair of guide portions 38 includes an inclined surface 381, and the inclined surface 381 has a slope that moves away from the other guide portion 38 as it moves away from the surface 340 to which the upper plate 4 is fixed in the axial direction. Thereby, the circumferential interval between the pair of guide portions 38 is narrowed toward the axial lower direction. The first plate 431 of the upper plate 4, which will be described later, is positioned in the circumferential direction by the first plate 431 contacting the inclined surface 381 of the guide portion 38 and moving in the axial direction. Therefore, workability can be improved.
< 1.4 > about the upper plate 4
As shown in fig. 1, 4, and the like, the upper plate 4 is attached to the upper surface 340 of the projection 34 of the insulating member 3. That is, the convex portion 34 is further provided with an upper plate 4 fixed via a fastener Bt. The upper plate 4 is metallic. The upper plate 4 includes a beam portion 41, an upper bearing holding portion 42, and a support portion 43. The beam portion 41, the upper bearing holding portion 42, and the pillar portion 43 are integrally formed. However, the present invention is not limited to this, and an assembly formed by assembling parts formed as separate members may be used.
The beam portion 41 has a plate shape expanding in the radial direction of the center axis C. As shown in fig. 1, 4, and the like, the beam portion 41 has a rectangular shape when viewed from the axial direction. The upper bearing holding portion 42 is disposed at the radial center portion of the beam portion 41. The upper bearing holding portion 42 holds the upper bearing Br 2. The upper bearing holding portion 42 has a bottomed cylindrical shape protruding upward in the axial direction. The upper bearing holding portion 42 has an upper shaft through hole 421 through which the shaft 11 passes in the center of the bottom portion.
The upper bearing Br2 is a ball bearing, and balls are arranged between the outer ring and the inner ring. The outer ring is fixed to the upper bearing holding portion 42, and the upper bearing Br2 is fixed to the upper bearing holding portion 42. Thereby, the center of the upper bearing Br2 overlaps with the central axis C. Further, a shaft 11 is fixed to an inner ring of the upper bearing Br 2. Thereby, the shaft 11 is rotatably supported by the upper bearing Br 2. When the shaft 11 is rotatably supported by the upper bearing Br2, the shaft 11 penetrates the upper shaft through hole 421 of the upper bearing holding portion 42.
The column portion 43 is connected to both ends of the beam portion 41 in the radial direction. The column part 43 includes a first plate 431 and a second plate 432. The second plates 432 are disposed to face each other with the center axis C therebetween. The first plate 431 has a flat plate shape extending radially outward from the axial lower end of the second plate 432.
The first plate 431 is fixed to the upper surface 340 of the boss 34. The second plate 432 extends upward from the radially inner end of the first plate 431. That is, the upper plate 4 includes a first plate 431 extending in the radial direction and facing the upper surface 340 of the convex portion 34 in the axial direction, and a second plate 432 extending upward in the axial direction from the radially inner end of the first plate 431.
A plate through hole 433 that penetrates in the axial direction is provided in a central portion of the first plate 431. The first plate 431 disposed on the upper surface 340 is guided by the inclined surface 381 to be disposed on the upper surface 340. Further, the first plate 431 is fixed to the boss 34 by a screw Bt as a fastener. That is, the first plate 431 is disposed between the pair of guide portions 38, and the first plate 431 is fixed to the boss portion 34 by a fastener Bt.
The screw Bt is passed through the plate through hole 433 of the first plate 431, and the upper plate 4 is fixed to the upper surface 340 of the convex portion 34. Thereby, the upper plate 4 is fixed to the insulating member 3. At this time, the second plate 432 is in contact with a portion of the core back 211 exposed to the outside of the insulating member 3, that is, the radially outer surface of the core back 211. That is, the upper plate 4 is in contact with the core back 211 and has conductivity at least in the portion in contact with the core back 211 and the fastener Bt. Further, the second plate 432 is in contact with the core back 211 in the radial direction. By bringing a fastener Bt such as a screw into contact with the upper plate 4 and bringing the upper plate 4 into contact with the core back 211, the core back 211 can be brought into electrical contact with the fastener Bt. This can easily ground the stator core 21.
In addition, a ground line GL is commonly fastened to one of the first plates 431 of the upper plate 4 by a screw Bt. Thereby, the upper plate 4 is grounded. Further, the core back 211 in contact with the second plate 432 of the upper plate 4 is also grounded.
< 1.4 > regarding the circuit board 5
The circuit board 5 is disposed axially below the insulating member 3. That is, the circuit board 5 is arranged with a gap in the axial direction from the lower portion of the stator 2. The circuit board 5 is electrically connected to the plurality of coils 22. The circuit board 5 includes a drive circuit (not shown). That is, the coil 22 is formed of a wire, and an end of the wire is connected to the circuit board 5. The drive circuit supplies current to the plurality of coils 22 at an appropriate timing.
The circuit board 5 includes a through hole 50 and a circuit board recess 51. The circuit board 5 has a disc shape. Further, a through hole 50 is formed in a radially central portion of the circuit board 5. The inner edge of the through hole 50 has a recess 501 recessed radially outward.
When the circuit board 5 is mounted on the lower side in the axial direction of the insulating member 3, the protruding portion 334 penetrates the through hole 50. The protrusion 334 may not penetrate the through hole 50. For example, the lower surface of the protruding portion 334 may be located between the upper surface and the lower surface of the circuit board 5 inside the through hole 50. The rib 335 of the protruding portion 334 is disposed in the recess 501 of the through-hole 50. Thereby, the circuit board 5 is positioned in the circumferential direction.
At this time, the leg portion 36 penetrates the circuit board recess 51 of the circuit board 5. Also, the upper surface of the contact 363 contacts the lower surface of the circuit board 5. Thereby, the movement of the circuit board 5 axially downward is restricted. At this time, the extension portions 37 (the first extension portion 371, the second extension portion 372) are in contact with the upper surface of the circuit board 5. The circuit board 5 is held by the substrate fixing portion 361 and the extending portion 37.
< 1.5 production of Motor A >
In the present embodiment, the insulating member 3 is an integrally molded resin body, and covers the stator core 21. Resin molding of the insulating member 3 will be described. First, the stator core 21 prepared in advance is fixed inside a mold for resin molding. Then, the mold is filled with a molding resin. At this time, the radially outer surface of the core back 211 is in contact with the mold. Therefore, the radially outer surface of the core back 211 is not covered with the insulating member 3, i.e., is exposed to the outside. Similarly, the radially inner surface of the flange portion 2121 of the tooth 212 is also brought into contact with a die or a nest, whereby the radially inner surface of the flange portion 2121 can be exposed to the outside of the insulating member 3.
After the resin is cured, the mold is removed, and the insulating member 3 covers a part of the stator core 21. As described above, the coupling portion 332 is disposed between the teeth 212 adjacent in the circumferential direction when viewed from the axial direction. Therefore, the mold is composed of a mold pulled out upward in the axial direction and a mold pulled out downward in the axial direction.
Then, the wire is wound around the teeth 212 covered with the tooth covering portion 32 of the insulating member 3, thereby forming the coil 22. At this time, the circumferential width of the coupling portion 332 is smaller than the minimum interval between the teeth 212 adjacent in the circumferential direction. This allows insertion of a jig, a mechanical device, or the like when winding the wire around the teeth 212. That is, it is easy to secure a space for winding the coil. Therefore, the formation of the coil 22 becomes easy.
After a part of the stator core 21 is covered with the insulating member 3, the lower bearing Br1 is fixed to the cylindrical portion 331. The fixing method is not particularly limited, and is performed by press-fitting. The upper bearing Br2 is fixed to the upper bearing holding portion 42 of the upper plate 4. The fixing method is the same as that of the lower bearing Br 1. Then, the shaft 11 of the rotor 1 is held by the lower bearing Br 1. The shaft 11 is held by an upper bearing Br2 held by the upper plate 4. Then, the first plate 431 of the column part 43 of the upper plate 4 is disposed on the upper surface 340 of the projection 34 and fixed by a screw Bt as a fastener. At this time, the ground line GL is fastened to one screw Bt together. Thereby, the rotor 1 is rotatably supported by the stator 2.
The circuit board 5 is mounted in the axial direction from below the stator 2 supporting the rotor 1. At this time, the circuit board 5 is positioned in the radial direction by inserting the protruding portion 334 into the through hole 50 of the circuit board 5. Meanwhile, the circuit board 5 is positioned in the circumferential direction by inserting the rib 335 formed on the protruding portion 334 into the recessed portion 501. Thereby, the circuit board recess 51 of the circuit board 5 overlaps with the leg portion 36 in the axial direction. On the other hand, the substrate fixing portion 361 of the leg portion 36 overlaps with the edge portion of the circuit board recess 51 in the axial direction.
In this state, by moving the circuit board 5 upward in the axial direction, the inclined portion 362 of the board fixing portion 361 is pressed by the edge portion of the circuit board concave portion 51. Also, the leg portion 36 is elastically deformed by the force. When the substrate fixing portion 361 is located below the lower surface of the circuit board 5, the inclined portion 362 comes out of contact with the edge portion of the circuit board concave portion 51, and the elastically deformed leg portion 36 returns to the original shape. Also, the contact portion 363 of the substrate fixing portion 361 contacts the lower surface of the circuit board 5. Thereby, the movement of the circuit board 5 axially downward is restricted. Also, the circuit board 5 is in contact with the lower surface of the extension portion 37. This suppresses the circuit board 5 from approaching the stator 2 too much, and maintains the position of the circuit board 5 in the axial direction, thereby suppressing the inclination with respect to the axis.
In the motor a described above, the insulating member 3 covering a part of the stator core 21 and the holding portion 33 holding the lower bearing Br1 are formed as an integral body. This makes it possible to omit a fixing member such as a screw for fixing the insulating member 3 and the holding portion 33, and to reduce the number of components. Further, since the screw fixing operation is not required, the number of operation steps can be reduced. Further, the holding portion can be made lighter than when the holding portion is formed of a metal plate such as a metal plate material. This can reduce the weight of the motor a.
By holding the lower bearing Br1 with the cylindrical portion 331 of the holding portion 33, the center lines of the stator 2 and the lower bearing Br1 are all aligned on the same line, and here, can be aligned with the center axis C. That is, in the mounting of the lower bearing Br1, the positioning of the stator 2 and the lower bearing Br1, that is, the so-called centering operation, can be omitted, and the man-hours required for the manufacturing can be reduced.
< 3. installation of Motor A to external device F >
An external device F to which the motor a of the present invention is mounted is explained with reference to the drawings. Fig. 12 is a sectional view showing a state where the motor of the present invention is mounted to an external device. In the present embodiment, the external device F to which the motor a is attached is an air blowing device that generates an air flow inside the air tunnel portion 7.
As shown in fig. 12, the external device F includes a motor a, an impeller 6, and an air channel portion 7. In the external device F, the motor a is housed inside the air tunnel portion 7. The air channel portion 7 is a cylindrical body extending in the axial direction. The air channel portion 7 includes a fixing protrusion 71 extending radially inward on the radially inner surface.
The motor a is housed inside the wind tunnel 7. Then, the screw Sc is inserted into the mounting portion 35 and fixed in a state where the convex portion 34 and the fixing projection 71 are overlapped in the axial direction. At this time, the head of the screw Sc is accommodated in the hole 352, and therefore the head of the screw Sc does not protrude in the axial direction. The fixing protrusion and the convex portion 34 are fixed by fixing the nut Nt at a portion where the screw Sc protrudes axially downward from the lower surface of the convex portion 34. That is, the motor a is fixed inside the wind tunnel portion 7.
However, the method of fixing the motor a is not limited thereto. For example, the screw Sc may be inserted from the axial lower side, and the nut Nt may be disposed inside the hole portion 352 of the mounting portion 35 to fix the screw Sc and the nut Nt. Further, the screw Sc may be screwed into the fixing projection 71 to fix the screw.
The fixing projection 71 is disposed below the convex portion 34 in the axial direction, but may be disposed above. In this case, the fixing projection 71 may be disposed in the hole 352 and the groove 353. With this arrangement, the rotation of the motor a can be stopped (positioned) at the time of assembly. This can improve workability.
Further, the motor a having the mounting portion 35 provided with the notch 354 shown in fig. 8 may be mounted. With this configuration, the motor a can be moved in the direction in which the notch 354 is recessed. This enables adjustment of the position of the motor a with respect to the air tunnel portion 7. The convex portion 34 and the fixed projection 71 are fixed by using a screw Sc that penetrates both the convex portion 34 and the fixed projection 71, but the present invention is not limited to this. For example, a fastener such as a rivet may be used, or a screw provided in advance in the fixing projection 71 may be passed through the mounting portion 35 and fixed by a nut.
An impeller 6 is fixed to the upper end of the shaft 11. The impeller 6 includes an impeller cup 61 and a plurality of blades 62. The impeller cup 61 is cylindrical. The impeller cup 61 includes a cylindrical hub (not shown) extending in the axial direction. The shaft 11 is inserted into the inside of the hub to be fixed. Thereby, the impeller 6 is fixed to the shaft 11. The impeller 6 is disposed inside the air tunnel 7. The impeller 6 rotates together with the shaft 11 about the central axis C. The plurality of blades 62 are each inclined in the circumferential direction. A plurality of vanes 62 extend radially outward from the radially outer surface of the impeller cup 61. The plurality of blades 62 are arranged at equal intervals in the circumferential direction.
In the external device F, when the motor a is driven, the shaft 11 rotates. The impeller 6 is rotated about the center axis C by the rotation of the shaft 11. By the rotation of the impeller 6, an air flow, i.e., an air flow, directed downward from the axially upward direction is generated in the air tunnel portion 7. To explain further, the opening at the upper end of the air tunnel 7 in the axial direction is an intake side opening 70I, and the opening at the lower end is an exhaust side opening 70X. In the air tunnel portion 7, air is taken in from the intake side opening 70I and air is discharged from the exhaust side opening 70X by rotation of the impeller 6.
In the external device F, the inner wall surface of the air channel portion 7 faces the radially outer surface of the motor a with a gap in the radial direction. In the external device F, the airflow flows through a gap between the inner wall surface of the wind tunnel portion 7 and the motor a in the radial direction. That is, a radial gap between the inner wall surface of the air tunnel 7 and the motor a serves as an air passage. As described above, in the motor a, the radially outer surface 2111 of the core back 211 is exposed to the outside of the insulating member 3. Therefore, when the motor a is mounted to the air tunnel 7, the radially outer surface 2111 of the core back 211 is exposed into the air passage. The radially outer surface 2111 of the core back 211 is cooled by the airflow. Thereby, the entire stator core 21 is cooled, and the coil 22 is also cooled. Therefore, the motor a can suppress a decrease in performance due to a temperature increase.
When the motor a of the present invention is mounted to an external device, the projection 34 projecting radially outward from the stator coating layer covering the stator core 21 is fixed. At the time of fixing, even if a force is applied to the projection 34, the force is not easily applied to the rotor 1, the stator 2, the circuit board 5, and the like. Therefore, it is possible to suppress a reduction in rotational accuracy due to strain caused by a force acting on the motor a during mounting.
In the motor a of the present invention, the holding portion 33 for holding the lower bearing Br1 is formed by integral molding with the insulating member 3 covering a part of the stator 2. Therefore, the number of components and the number of assembly steps can be reduced as compared with a structure in which the holding portion 33 is provided as another component.
While the embodiments of the present invention have been described above, the embodiments can be variously modified within the scope of the gist of the present invention.
Industrial applicability
The motor of the present invention can be used as a driving device for external devices such as a dryer, a blower fan, and a vacuum cleaner.

Claims (10)

1. A motor is provided with:
a rotor having a shaft extending along a central axis, the central axis extending in an up-down direction;
a stator that is radially opposed to the rotor;
a bearing rotatably supporting the shaft;
an insulating member covering a part of the stator; and
a circuit board disposed with a gap in an axial direction from a lower portion of the stator,
the stator includes:
a stator core including an annular core back portion and a plurality of teeth extending radially inward from a radially inner peripheral portion of the core back portion; and
A coil formed of a wire, an end of the wire being connected with the circuit board,
the insulating member includes:
an iron core back coating portion that covers the iron core back; and
a convex portion extending from the core back cladding portion toward a radially outer side,
the protruding portion includes a mounting portion that is located radially outward of an outer edge of the circuit board when viewed in an axial direction and that is fixed to an external device,
the convex portion includes:
a leg portion projecting axially downward and including a substrate fixing portion contacting an axially lower surface of the circuit board; and
an extension portion extending axially downward toward the circuit board,
the lower end surface of the extension portion is in contact with the upper surface of the circuit board or is opposite to the upper surface of the circuit board with a gap,
the leg portion is adjacent to the extension portion, and both the leg portion and the extension portion extend from the same protrusion.
2. The motor of claim 1,
the mounting portion includes a through hole that penetrates in the axial direction.
3. The motor according to claim 1 or 2,
the mounting portion has a notch recessed in a direction perpendicular to the axial direction.
4. The motor of claim 1,
The leg portion is adjacent to the extending portion via a recess portion recessed upward in the axial direction.
5. The motor of claim 1,
the extension part is provided with:
a first extension circumferentially adjacent the leg; and
a second extension radially adjacent the leg.
6. The motor of claim 1,
the insulating member is provided with a plurality of the projections,
the plurality of extending portions and the plurality of leg portions are disposed at positions symmetrical with respect to the central axis.
7. The motor according to claim 1 or 2,
the convex part is further provided with an upper plate fixed by a fastener,
the upper plate is in contact with the core back and has conductivity at least in a portion in contact with the core back and the fastener.
8. The motor of claim 7,
the upper plate is provided with:
a first plate extending in a radial direction and axially opposed to an upper surface of the convex portion; and
a second plate extending axially upward from a radially inner end of the first plate,
the second plate is in radial contact with the core back.
9. The motor of claim 8,
The convex portion further includes a pair of guide portions axially protruding from a surface to which the upper plate is fixed and arranged in a circumferential direction,
at least one of the pair of guide portions has an inclined surface having a slope that is away from the other guide portion as the inclined surface is axially away from the surface to which the upper plate is fixed.
10. The motor of claim 9,
the first plate is disposed between the pair of guide portions,
the first plate is fixed to the boss by the fastener.
CN201910571573.2A 2018-06-29 2019-06-28 Motor Active CN110661350B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-124893 2018-06-29
JP2018124893A JP2020005461A (en) 2018-06-29 2018-06-29 motor

Publications (2)

Publication Number Publication Date
CN110661350A CN110661350A (en) 2020-01-07
CN110661350B true CN110661350B (en) 2022-06-28

Family

ID=68886418

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201921000114.0U Active CN210074905U (en) 2018-06-29 2019-06-28 Motor with a stator having a stator core
CN201910571573.2A Active CN110661350B (en) 2018-06-29 2019-06-28 Motor

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201921000114.0U Active CN210074905U (en) 2018-06-29 2019-06-28 Motor with a stator having a stator core

Country Status (3)

Country Link
JP (1) JP2020005461A (en)
CN (2) CN210074905U (en)
DE (1) DE102019209212A1 (en)

Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2583871Y (en) * 2002-11-14 2003-10-29 艾欧史密斯电气产品(常州)有限公司 Brushless dc motor
CN101331667A (en) * 2005-12-16 2008-12-24 三菱电机株式会社 Motor generator for vehicle
KR20100086758A (en) * 2009-01-23 2010-08-02 엘지이노텍 주식회사 Motor
CN201559179U (en) * 2008-05-02 2010-08-25 布莱克和戴克公司 Power tool
CN203166659U (en) * 2010-08-20 2013-08-28 日本电产株式会社 Motor
CN103492287A (en) * 2011-03-01 2014-01-01 约翰逊父子公司 Drive module assembly and method of assembling same
CN103580355A (en) * 2012-07-20 2014-02-12 株式会社电装 Electric motor
CN203660725U (en) * 2012-11-13 2014-06-18 日本电产株式会社 Motor
CN204205793U (en) * 2013-12-20 2015-03-11 日本电产株式会社 Inner-rotor type motor
CN204304715U (en) * 2013-12-16 2015-04-29 日本电产株式会社 The motor of ceiling fan and ceiling fan
CN204835832U (en) * 2015-07-06 2015-12-02 广东丽爽实业股份有限公司 Motor with circuit board
KR20160004662A (en) * 2014-07-03 2016-01-13 권동철 EC motor driver for integrated
CN205078479U (en) * 2014-10-15 2016-03-09 日本电产株式会社 Motor and ceiling fan for ceiling fan
CN105490494A (en) * 2014-10-06 2016-04-13 标立电机公司 Electronic rectification dc motor special for an oil pump
CN105656239A (en) * 2014-11-28 2016-06-08 日本电产株式会社 Motor
CN205453418U (en) * 2015-05-29 2016-08-10 日本电产株式会社 Motor
CN205509792U (en) * 2016-03-21 2016-08-24 杭州三花研究院有限公司 Fluid pump
CN105958693A (en) * 2016-07-18 2016-09-21 江苏雷利电机股份有限公司 Motor stator structure
CN106067711A (en) * 2015-04-24 2016-11-02 阿斯莫株式会社 Vehicle motor drive control device
CN106100273A (en) * 2016-08-11 2016-11-09 依必安派特风机(上海)有限公司 A kind of inner-rotor brushless motor
CN106208535A (en) * 2015-05-29 2016-12-07 日本电产株式会社 Motor
KR20170016692A (en) * 2015-08-04 2017-02-14 뉴모텍(주) Fan motor
CN107078591A (en) * 2014-09-30 2017-08-18 日本电产株式会社 Motor
CN206471936U (en) * 2017-02-07 2017-09-05 东莞市羿进电子有限公司 A kind of outer rotor DC motor
CN206564498U (en) * 2017-03-29 2017-10-17 中山市盟拓机电有限公司 A kind of brushless motor structure for automatic timer
CN206834893U (en) * 2017-04-08 2018-01-02 中山市瑞吉浦电气有限公司 three-phase brushless DC motor
CN107534369A (en) * 2015-05-15 2018-01-02 三菱电机株式会社 Vehicle alternator
CN107542671A (en) * 2016-06-23 2018-01-05 浙江三花汽车零部件有限公司 Electronic pump
CN107565756A (en) * 2016-06-30 2018-01-09 上海汽车集团股份有限公司 Oil pump electrical machinery, gearbox and automobile
CN206977166U (en) * 2016-05-30 2018-02-06 日本电产三协（浙江）有限公司 Motor and pump installation
CN107733172A (en) * 2016-08-11 2018-02-23 翰昂汽车零部件有限公司 Brushless DC motor built in inverter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5267091B2 (en) 2008-12-08 2013-08-21 トヨタ自動車株式会社 Stator for rotating electrical machine

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2583871Y (en) * 2002-11-14 2003-10-29 艾欧史密斯电气产品(常州)有限公司 Brushless dc motor
CN101331667A (en) * 2005-12-16 2008-12-24 三菱电机株式会社 Motor generator for vehicle
CN201559179U (en) * 2008-05-02 2010-08-25 布莱克和戴克公司 Power tool
KR20100086758A (en) * 2009-01-23 2010-08-02 엘지이노텍 주식회사 Motor
CN203166659U (en) * 2010-08-20 2013-08-28 日本电产株式会社 Motor
CN103492287A (en) * 2011-03-01 2014-01-01 约翰逊父子公司 Drive module assembly and method of assembling same
CN103580355A (en) * 2012-07-20 2014-02-12 株式会社电装 Electric motor
CN203660725U (en) * 2012-11-13 2014-06-18 日本电产株式会社 Motor
CN204304715U (en) * 2013-12-16 2015-04-29 日本电产株式会社 The motor of ceiling fan and ceiling fan
CN204205793U (en) * 2013-12-20 2015-03-11 日本电产株式会社 Inner-rotor type motor
CN108336853A (en) * 2013-12-20 2018-07-27 日本电产株式会社 Inner-rotor type motor
KR20160004662A (en) * 2014-07-03 2016-01-13 권동철 EC motor driver for integrated
CN107078591A (en) * 2014-09-30 2017-08-18 日本电产株式会社 Motor
CN105490494A (en) * 2014-10-06 2016-04-13 标立电机公司 Electronic rectification dc motor special for an oil pump
CN205078479U (en) * 2014-10-15 2016-03-09 日本电产株式会社 Motor and ceiling fan for ceiling fan
CN105656239A (en) * 2014-11-28 2016-06-08 日本电产株式会社 Motor
CN106067711A (en) * 2015-04-24 2016-11-02 阿斯莫株式会社 Vehicle motor drive control device
CN107534369A (en) * 2015-05-15 2018-01-02 三菱电机株式会社 Vehicle alternator
CN205453418U (en) * 2015-05-29 2016-08-10 日本电产株式会社 Motor
CN106208535A (en) * 2015-05-29 2016-12-07 日本电产株式会社 Motor
CN204835832U (en) * 2015-07-06 2015-12-02 广东丽爽实业股份有限公司 Motor with circuit board
KR20170016692A (en) * 2015-08-04 2017-02-14 뉴모텍(주) Fan motor
CN205509792U (en) * 2016-03-21 2016-08-24 杭州三花研究院有限公司 Fluid pump
CN206977166U (en) * 2016-05-30 2018-02-06 日本电产三协（浙江）有限公司 Motor and pump installation
CN107542671A (en) * 2016-06-23 2018-01-05 浙江三花汽车零部件有限公司 Electronic pump
CN107565756A (en) * 2016-06-30 2018-01-09 上海汽车集团股份有限公司 Oil pump electrical machinery, gearbox and automobile
CN105958693A (en) * 2016-07-18 2016-09-21 江苏雷利电机股份有限公司 Motor stator structure
CN106100273A (en) * 2016-08-11 2016-11-09 依必安派特风机(上海)有限公司 A kind of inner-rotor brushless motor
CN107733172A (en) * 2016-08-11 2018-02-23 翰昂汽车零部件有限公司 Brushless DC motor built in inverter
CN206471936U (en) * 2017-02-07 2017-09-05 东莞市羿进电子有限公司 A kind of outer rotor DC motor
CN206564498U (en) * 2017-03-29 2017-10-17 中山市盟拓机电有限公司 A kind of brushless motor structure for automatic timer
CN206834893U (en) * 2017-04-08 2018-01-02 中山市瑞吉浦电气有限公司 three-phase brushless DC motor

Also Published As

Publication number Publication date
JP2020005461A (en) 2020-01-09
CN210074905U (en) 2020-02-14
DE102019209212A1 (en) 2020-01-02
CN110661350A (en) 2020-01-07

Similar Documents

Publication Publication Date Title
JP5067167B2 (en) Brushless motor and fan unit
JP5360473B2 (en) Motor and blower fan using the same
JP5775853B2 (en) Molded motor
US11101708B2 (en) Rotor, motor, air conditioning apparatus, and manufacturing method of rotor
KR20190109543A (en) motor
KR20130054136A (en) Mold motor
US11056953B2 (en) Stator unit, motor, and fan motor
CN110661351B (en) Motor
JP4705122B2 (en) Motor and blower fan
JP2013514754A (en) Electric motor
JP5493339B2 (en) Motor, fan, motor manufacturing method, and fan manufacturing method
US20210099043A1 (en) Motor and blower
CN110661350B (en) Motor
US10965179B2 (en) Stator unit, motor, and blower apparatus
JP2014099961A (en) Electric motor and ventilation fan
US20200309191A1 (en) Gas dynamic pressure bearing, motor, and fan motor
JP7210886B2 (en) motors and fan motors
CN108933496B (en) Motor
JP5250069B2 (en) Motor and blower fan
US20180152073A1 (en) Stator unit and motor
JP7400249B2 (en) Gas dynamic pressure bearings, motors, fan motors and series fan motors
JP2019126123A (en) motor
US20230216380A1 (en) Stator assembly for electronically switched electric motor
JP7363287B2 (en) Motor and blower
JP6969393B2 (en) motor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant