US20180209429A1 - Motor and air blowing apparatus including the same - Google Patents
Motor and air blowing apparatus including the same Download PDFInfo
- Publication number
- US20180209429A1 US20180209429A1 US15/867,839 US201815867839A US2018209429A1 US 20180209429 A1 US20180209429 A1 US 20180209429A1 US 201815867839 A US201815867839 A US 201815867839A US 2018209429 A1 US2018209429 A1 US 2018209429A1
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- United States
- Prior art keywords
- radial direction
- motor according
- guide
- circuit board
- guide portion
- 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.)
- Abandoned
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Classifications
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- 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
- H02K11/0094—Structural association with other electrical or electronic devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0693—Details or arrangements of the wiring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5813—Cooling the control unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
Definitions
- the present invention relates to a motor and an air blowing apparatus including the same.
- a fan including an impeller unit, a motor unit, and a fan base is disclosed in Japanese Unexamined Patent Application Publication No. 2006-177309.
- the motor unit has a circuit board.
- the fan base is provided with at least one pillow portion.
- the pillow portion of the fan base faces an impeller boss to form an air vent and a flow passage so that part of a fluid driven by the rotation of the fan is guided into the boss to dissipate heat with respect to the entire motor accommodated in the boss.
- An exemplary motor of the invention includes a body portion, a circuit board, and a guide portion.
- the body portion includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction.
- the circuit board is disposed below the body portion and has an electronic component mounted thereon.
- the guide portion guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion. At least a part of the guide portion faces the electronic component in the radial direction.
- An exemplary air blowing apparatus of the invention includes the motor having the above-described configuration, and an impeller that is provided in the rotor and rotates around the center axis by driving the motor.
- the impeller rotates to suck air from an upper side and exhaust the air to a lower side.
- the motor capable of increasing an efficiency of cooling the electronic component, and the air blowing apparatus including the same.
- FIG. 1 is a perspective view illustrating an air blowing apparatus including a motor according to a first embodiment of the invention.
- FIG. 2 is a top view illustrating the air blowing apparatus including the motor according to the first embodiment of the invention.
- FIG. 3 is a sectional view taken along a line A-O-A of FIG. 2 .
- FIG. 4 is a perspective view, when viewed from below, of the air blowing apparatus including the motor according to the first embodiment of the invention.
- FIG. 5 is a perspective view, when viewed from below, of the air blowing apparatus from which a circuit board of the motor according to the first embodiment of the invention is removed.
- FIG. 6 is a bottom view illustrating the air blowing apparatus from which the circuit board of the motor according to the first embodiment of the invention is removed.
- FIG. 7 is an enlarged side sectional view illustrating an enlarged peripheral portion of the air blowing apparatus including the motor according to the first embodiment of the invention.
- FIG. 8 is a perspective view of an insulator of the motor according to the first embodiment of the invention when viewed from below.
- FIG. 9 is a side sectional view illustrating a dryer in which the air blowing apparatus including the motor according to the first embodiment of the invention is mounted.
- FIG. 10 is a top view illustrating an air blowing apparatus including a motor according to a first modification example of the first embodiment of the invention.
- FIG. 11 is a front sectional view illustrating a circuit board and a guide portion of a motor according to a second modification example of the first embodiment of the invention.
- FIG. 12 is a front sectional view of a guide portion of a motor according to a third modification example of the first embodiment of the invention.
- FIG. 13 is a side sectional view of a dryer in which an air blowing apparatus including a motor according to a second embodiment of the invention is mounted.
- FIG. 14 is a sectional view perpendicular to an axial direction of the motor according to the second embodiment of the invention.
- a direction in which a center axis C extends with respect to a motor 100 and an air blowing apparatus 200 is simply referred to as an “axial direction”.
- a direction from a circuit board 7 to a body portion 10 is simply referred to as “upward” and a direction from the body portion 10 to the circuit board 7 is simply referred to as “downward” in the axial direction.
- a surface facing upward in the axial direction is referred to as an “upper surface” and a surface facing downward in the axial direction is referred to as a “lower surface” on a surface of each configuration element.
- a radial direction with respect to the center axis C is simply referred to as a “radial direction” and a circumferential direction around the center axis C is simply referred to as a “circumferential direction”.
- a direction toward the center axis C is simply referred to as “inside” and a direction away from the center axis C is simply referred to as “outside” in the radial direction.
- a side surface facing inside in the radial direction is referred to as an “inside surface” and a side surface facing outside in the radial direction is referred to as an “outside surface” on the surface of each configuration element.
- a direction of an airflow sent from the air blowing apparatus 200 is referred to as an “air blowing direction”.
- a direction from an upstream to a downstream in the air blowing direction is simply referred to as “front side” and a direction from the downstream to the upstream is simply referred to as “back side” in the air blowing direction.
- FIG. 1 is a perspective view illustrating the air blowing apparatus 200 including the motor 100 according to a first embodiment of the invention.
- FIG. 2 is a top view illustrating the air blowing apparatus 200 .
- FIG. 3 is a sectional view taken along a line A-O-A of FIG. 2 .
- the air blowing apparatus 200 includes the motor 100 and an impeller 101 .
- the impeller 101 is an impeller attached to the motor 100 from an upper side and includes a plurality of blades 101 a, a peripheral wall member 101 b, and a base portion 101 c.
- the base portion 101 c has an umbrella shape and a diameter of a section of the base portion 101 c in the axial direction increases as the base portion 101 c extends downward. That is, the inner diameter of the base portion 101 c is gradually increased downward.
- the plurality of blades 101 a are disposed on an outside surface of the base portion 101 c side by side in the circumferential direction.
- the peripheral wall member 101 b is formed in a cylindrical shape and protrudes downward from the inside surface of the base portion 101 c.
- the impeller 101 rotates around the center axis C extending in a top-bottom direction by driving the motor 100 and generates airflow.
- the motor 100 is a driving device which drives and rotates the impeller 101 and, for example, is mounted in an electric machine such as a dryer 300 (see FIG. 9 described later).
- the motor 100 includes the body portion 10 , a bearing holder 4 , a bracket 5 , a tie pin 6 , and the circuit board 7 .
- the body portion 10 has a rotor 1 and a stator 2 .
- the rotor 1 is a rotor of the motor 100 and has a shaft 11 , a rotor holder 12 , and a magnet 13 .
- the shaft 11 is disposed on a rotation axis extending in a top-bottom direction (direction of the center axis C).
- the rotor holder 12 holds the magnet 13 and is rotatable together with the shaft 11 and the impeller 101 .
- the motor 100 is an outer rotor motor.
- the magnet 13 is disposed outside the stator 2 in the radial direction and faces the stator 2 in the radial direction.
- the rotor holder 12 is disposed inside the peripheral wall member 101 b of the impeller 101 in the radial direction and accommodates the stator 2 therein.
- the rotor holder 12 includes a disk-shaped lid portion 121 and a tubular cylindrical portion 122 .
- the lid portion 121 extends outward from the shaft 11 in the radial direction.
- the cylindrical portion 122 extends downward in the axial direction from an outer peripheral edge of the lid portion 121 .
- the peripheral wall member 101 b of the impeller 101 is attached to the outside of the cylindrical portion 122 in the radial direction.
- the magnet 13 is held on the inside surface of the cylindrical portion 122 .
- the stator 2 is an armature of the motor 100 and is held on the outside surface of the bearing holder 4 .
- the stator 2 faces the rotor 1 in the radial direction and drives and rotates the rotor 1 .
- the stator 2 includes a stator core 21 , a plurality of coil portions 22 , and an insulator 23 .
- the stator core 21 is a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction, and is disposed outside the bearing holder 4 in the radial direction and inside the magnet 13 in the radial direction.
- Each of the coil portions 22 is a winding member in which a conductor wire (for example, a lead wire 221 ) is wound around the insulator 23 , and is arranged in the circumferential direction.
- the end portion of the lead wire 221 is tied to the tie pin 6 in a state where an insulating layer is peeled off.
- the tie pin 6 constitutes a terminal for electrically connecting the coil portion 22 and the circuit board 7 to each other.
- the insulator 23 is an insulating member formed of, for example, resin and covers the stator core 21 .
- the stator core 21 and the coil portion 22 are electrically separated by the insulator 23 .
- the insulator 23 has a support member 3 (see also FIG. 8 ) that supports the tie pin 6 .
- the support member 3 protrudes from a lower end of the insulator 23 to the circuit board 7 .
- the support member 3 includes a pin support portion 31 that supports the tie pin 6 and a pin connecting portion 32 that connects the adjacent pin support portions 31 (see FIG. 8 ) to one another.
- the bearing holder 4 is formed of, for example, a metal and holds a bearing 41 above and a bearing 42 below.
- the bearing holder 4 is disposed outside the shaft 11 in the radial direction and inside the stator 2 in the radial direction.
- the bearings 41 and 42 rotatably support the shaft 11 .
- a ball bearing, a sleeve bearing, or the like is used as the bearings 41 and 42 .
- the bearing holder 4 includes a cylindrical portion 4 a extending in the axial direction and a rectangular plate portion 4 b.
- the bearings 41 and 42 are held inside the cylindrical portion 4 a.
- the plate portion 4 b extends outside in the radial direction from a periphery of a lower end portion of the cylindrical portion 4 a.
- a position of a lower surface of the plate portion 4 b near the cylindrical portion 4 a is substantially the same as a position of a lower surface of a cover plate 52 of the bracket 5 .
- An upper surface and a lower surface of both end portions of the plate portion 4 b in a longitudinal direction are caught in the cover plate 52 . Therefore, the bearing holder 4 is held by the bracket 5 .
- the plate portion 4 b and the cylindrical portion 4 a are formed of different members, but may be constituted by a single member.
- FIG. 4 is a bottom view illustrating the air blowing apparatus 200 .
- the circuit board 7 is disposed below the body portion 10 .
- the circuit board 7 has a substantially disk shape and is formed of, for example, resin such as epoxy resin. As described below, the circuit board 7 is held by the bracket 5 .
- the circuit board 7 includes a plurality of first holes 72 , a plurality of second holes 73 , and a plurality of board cutout portions 74 .
- the circuit board 7 includes three first holes 72 , three second holes 73 , and two board cutout portions 74 .
- the first holes 72 and the second holes 73 are through-holes that penetrate the circuit board 7 from the upper surface to the lower surface.
- the board cutout portions 74 are formed at two positions on a peripheral edge of the circuit board 7 . Two board cutout portions 74 are opposite to each other with the shaft 11 therebetween when viewed in the axial direction.
- An electronic component 71 is mounted on the lower surface of the circuit board 7 .
- the electronic component 71 includes an AC/DC converter, an inverter, a control circuit, a position detection circuit, and the like.
- the control circuit controls the rotation of the rotor 1 and includes an IC 71 e.
- the IC 71 e is mounted to extend in a direction perpendicular to the axial direction.
- an intelligent power module IPM
- the AC/DC converter is, for example, a conversion circuit that converts AC power supply supplied from a commercial power supply (not illustrated) to DC power.
- the AC/DC converter includes elements which are relatively large and heavy such as an electrolytic capacitor 71 a and a choke coil 71 b.
- the electrolytic capacitor 71 a is an electric storage element that stores charge of relatively high capacity.
- the choke coil 71 b is a winding member in which a winding is wound around an iron core and functions as a noise filter for removing noise of power supply of the motor 100 .
- the inverter is a power supply circuit that supplies supply power to the stator 2 and supply power is generated by using DC electric power output from the AC/DC converter.
- the position detection circuit is a detection portion that detects the position (that is, a rotation angle) of the rotor 1 based on an induced voltage generated in the coil portion 22 of the stator 2 due to the rotation of the rotor 1 .
- the induced voltage is a voltage generated in the coil portion 22 by a magnetic force of the magnet 13 when the rotor 1 is rotated.
- the shortest distance between the stator 2 and the circuit board 7 is shorter than that of a case where the electronic component 71 is mounted on the upper surface of the circuit board 7 .
- the shortest distance between the stator 2 and the circuit board 7 is not affected by the size of the electronic component 71 mounted on the circuit board 7 in the axial direction. Therefore, even if an element, of which particularly the size in the axial direction is relatively large such as the electrolytic capacitor 71 a used in the AC/DC converter, is mounted on the circuit board 7 , it is possible to prevent an increase in the distance between the stator 2 and the circuit board 7 . Therefore, it is possible to reduce disconnection of the wiring (particularly, the lead wire 221 ) between the stator 2 and the circuit board 7 .
- FIG. 5 is a perspective view of the air blowing apparatus 200 from which the circuit board 7 is removed when viewed from below.
- FIG. 6 is a bottom view (lower view) illustrating the air blowing apparatus 200 from which the circuit board 7 is removed.
- the bracket 5 is attached to the lower portion of the stator 2 .
- the bracket 5 is formed by, for example, injection molding using a resin material and includes a holding portion 51 , a guide portion 56 , a connecting portion 57 , and a locking portion 59 .
- the holding portion 51 is disposed at the lower portion of the body portion 10 and holds the circuit board 7 .
- the holding portion 51 includes the cover plate 52 , a cylindrical portion 53 , a plurality of board support portions 54 , and a plurality of the hook members 55 .
- three board support portions 54 are provided and two hook members 55 are provided.
- the cylindrical portion 53 has a substantially circular cross section perpendicular to the axial direction and covers at least a part of the outside surface of the body portion 10 above the circuit board 7 .
- the outside surface of the cylindrical portion 53 is provided with a pair of the locking portions 59 .
- the board support portion 54 and the hook member 55 are provided at the lower end of the cylindrical portion 53 .
- a cutout portion 53 a is provided at the lower end of the cylindrical portion 53 . At least a part of the outer edge portion of the circuit board 7 protrudes further outside in the radial direction than the outer edge of the cylindrical portion 53 when viewed in the axial direction.
- the cover plate 52 holds the plate portion 4 b of the bearing holder 4 . Both ends of the cover plate 52 in the longitudinal direction are connected to the cylindrical portion 53 at two positions where the pair of the locking portions 59 is connected to the holding portion 51 when viewed in the axial direction. Therefore, two bracket opening portions 524 and 525 are formed between the cylindrical portion 53 and the cover plate 52 in a lateral direction of the cover plate 52 .
- the pair of locking portions 59 are opposite to each other with the shaft 11 therebetween and protrudes further outward than the guide portion 56 in the radial direction.
- the locking portions 59 are a member for being locked to an inner wall of the duct through which the airflow circulates.
- the locking portions 59 are locked to a groove portion (not illustrated) provided in the inner wall of the duct.
- the motor 100 is attached to an electric machine in which the air blowing apparatus 200 is mounted.
- the duct is a dryer housing 301 of the dryer 300 .
- the locking portions 59 are locked to a groove portion (not illustrated) provided in an inner wall of the dryer housing 301 .
- the motor 100 is attached to the dryer 300 which will be described later.
- the longitudinal direction of the cover plate 52 is parallel to a connecting line which connects a center of a portion of the peripheral edge of the lower end of the cylindrical portion 53 connected to one of the pair of the locking portions 59 and a center of a portion of the peripheral edge of the lower end of the cylindrical portion 53 connected to the other of the pair of the locking portions 59 to each other when viewed in the axial direction. That is, both ends of the cover plate 52 in the longitudinal direction are connected to the cylindrical portion 53 at two positions when viewed in the axial direction.
- the cover plate 52 is connected to the cylindrical portion 53 at two positions where vibration of the motor 100 is very easily transmitted. Therefore, the vibration of the motor 100 can be efficiently transmitted to the electric machine. Therefore, it is possible to reduce an eigenvalue (vibration frequency) generated in the bracket 5 . Furthermore, it is possible to increase an attaching strength when the motor 100 is attached to the electric machine.
- the cover plate 52 includes a connection opening portion 521 , two first protrusion portions 522 and two second protrusion portions 523 .
- the connection opening portion 521 penetrates the cover plate 52 from the upper surface to the lower surface.
- the first protrusion portion 522 and the second protrusion portion 523 are provided at a peripheral edge of the connection opening portion 521 .
- the board support portion 54 is provided at the peripheral edge of the lower end of the cylindrical portion 53 .
- the board support portion 54 includes a stopper portion 541 and a column portion 542 .
- the stopper portion 541 protrudes downward from the lower end of the cylindrical portion 53 in the axial direction.
- the column portion 542 is provided inside the stopper portion 541 in the radial direction and on the inside surface of the cylindrical portion 53 , and protrudes further downward than the lower end of the stopper portion 541 in the axial direction.
- the hook member 55 is provided at the lower end of the cylindrical portion 53 .
- the hook member 55 includes an extension portion 551 and a claw portion 552 .
- the extension portion 551 extends from the cylindrical portion 53 toward the circuit board 7 .
- the claw portion 552 protrudes from the extension portion 551 toward the circuit board 7 .
- the extension portion 551 extends downward in the axial direction from the peripheral edge of the lower end of the cylindrical portion 53 toward the circuit board 7 .
- the claw portion 552 protrudes inside in the radial direction from the inside surface of the extension portion 551 toward the circuit board 7 .
- the tie pin 6 When the motor 100 is assembled, the tie pin 6 is inserted into the first hole 72 (see FIG. 4 ) and penetrates the first hole 72 .
- the tie pin 6 is soldered to the circuit board 7 and is electrically connected to the circuit board 7 .
- the board support portion 54 is press-fitted into the second hole 73 (see FIG. 4 ).
- the hook member 55 is attached to the board cutout portion 74 by snap-fitting. That is, the hook member 55 is engaged with the board cutout portion 74 by elastic deformation.
- the circuit board 7 is held by the holding portion 51 of the bracket 5 by a press fitting structure by the board support portion 54 , a snap fit structure by the hook member 55 , and a soldering structure of the tie pin 6 .
- FIG. 7 is an enlarged side sectional view illustrating an enlarged peripheral portion of the air blowing apparatus 200 .
- the guide portion 56 has an arc shape (a portion of the circumference) the center of which is the center axis C when viewed in the axial direction.
- the guide portion 56 has a semicircular circumferential shape when viewed in the axial direction. That is, the guide portion 56 extends in a circumferential direction.
- the guide portion 56 is disposed outside in the radial direction and below the body portion 10 and the holding portion 51 , and at least a part of the guide portion 56 faces the electronic component 71 on the circuit board 7 in the radial direction.
- the lower end of the guide portion 56 is disposed above the lower end of the electronic component 71 .
- the guide portion 56 is disposed outside the circuit board 7 in the radial direction. At least an upper portion of a surface 56 a inside the guide portion 56 in the radial direction is inclined inside in the radial direction as the upper portion extends downward. At least a part of the guide portion 56 is disposed at the position same as that of the cutout portion 53 a of the cylindrical portion 53 in the circumferential direction. That is, the cutout portion 53 a is disposed at the position same as that of at least a part of the guide portion 56 in the circumferential direction. As described below, the guide portion 56 guides the airflow (arrow S in FIG. 1 and the like), which circulates in the top-bottom direction, downward and inside the body portion 10 in the radial direction.
- the motor 100 includes the body portion 10 having the rotor 1 that rotates around the center axis C extending in the top-bottom direction and has the magnet 13 , and the stator 2 that faces the magnet 13 in the radial direction.
- the motor 100 includes the circuit board 7 which is disposed below the body portion 10 and on which the electronic component 71 is mounted.
- the motor 100 includes the guide portion 56 that guides the airflow, which circulates downward in the top-bottom direction, toward inside in the radial direction below the body portion 10 . At least a part of the guide portion 56 faces the electronic component 71 in the radial direction.
- a plurality of the connecting portions 57 are disposed side by side in the circumferential direction and extend outside in the radial direction and downward from the outer peripheral end of the holding portion 51 .
- the connecting portions 57 extend outside in the radial direction and downward from the outside surface of the cylindrical portion 53 of the holding portion 51 .
- the connecting portion 57 connects the holding portion 51 and the guide portion 56 to each other.
- the locking portion 59 is provided to protrude outside in the radial direction from the outer periphery portion of the connecting portion 57 .
- four connecting portions 57 are disposed in the circumferential direction.
- FIG. 8 is a perspective view of the insulator 23 when view from below. Upward in FIG. 8 corresponds to downward in FIG. 3 and downward in FIG. 8 corresponds to upward in FIG. 3 .
- the support member 3 supports the tie pin 6 and protrudes downward (upward in FIG. 8 ) from the lower end of the insulator 23 . Since the tie pin 6 is supported by the support member 3 , even in a case where the vibration of the motor 100 is generated, the wiring between the coil portion 22 and the circuit board 7 can be stabilized.
- the support member 3 is disposed within the connection opening portion 521 (see FIG. 5 ) when viewed in the axial direction and penetrates the connection opening portion 521 to extend in the axial direction.
- the tie pin 6 extends downward from a tip (lower end) of the support member 3 , is inserted into the first hole 72 (see FIG. 4 ) of the circuit board 7 , and is soldered to the circuit board 7 . Thereby, the coil portion 22 is electrically connected to a wiring pattern on the circuit board 7 via the connection opening portion 521 .
- the support member 3 includes three pin support portions 31 and two pin connecting portions 32 .
- the number of the pin support portions 31 is not limited to three and may be plural other than three.
- Each of the pin support portions 31 protrudes from the insulator 23 toward the circuit board 7 below and supports the tie pin 6 .
- the pin connecting portion 32 connects adjacent pin support portions 31 to one another.
- the first protrusion portion 522 and the second protrusion portion 523 are provided at the peripheral edge of the connection opening portion 521 in the cover plate 52 .
- the first protrusion portion 522 protrudes outside in the radial direction from the peripheral edge of the connection opening portion 521 and is in contact with the inside surface of the pin connecting portion 32 of the support member 3 .
- the second protrusion portion 523 protrudes inside in the radial direction from the peripheral edge of the connection opening portion 521 and is in contact with the outside surface of the pin connecting portion 32 of the support member 3 .
- the vibration of the motor 100 transmitted from the cover plate 52 via the first protrusion portion 522 and the second protrusion portion 523 can be reduced by the pin connecting portion 32 and is unlikely to be transmitted to the pin support portion 31 . Therefore, even in a case where the vibration of the tie pin 6 is generated, the wiring (particularly, the lead wire 221 ) between the coil portion 22 and the circuit board 7 can be stabilized.
- the impeller 101 rotates in the rotation direction R and air is sucked from the upper side of the impeller 101 .
- the air sucked from the upper side circulates between the adjacent blades 101 a and is accelerated outward in the radial direction and downward by the rotating impeller 101 .
- the air which is accelerated outward in the radial direction and downward is exhausted further downward than the impeller 101 .
- the air blowing apparatus 200 includes the motor 100 , and the impeller 101 that is provided in the rotor 1 and is rotated around the center axis C by driving the motor 100 .
- the impeller 101 rotates to suck air from the upper side and exhaust the air to the lower side. Therefore, as indicated by an arrow S (see FIGS. 1 and 3 ), the airflow circulating downward in the top-bottom direction is generated.
- the motor 100 includes the guide portion 56 . That is, in this case, the airflow circulating downward in the top-bottom direction is guided inward in the radial direction below the body portion 10 by the guide portion 56 . At least a part of the guide portion 56 faces the electronic component 71 in the radial direction. Therefore, part of the airflow circulating downward in the top-bottom direction is guided inward in the radial direction and the airflow guided inward in the radial direction hits the electronic component 71 . The airflow hitting the electronic component 71 is directed downward. Therefore, it is possible to improve the efficiency of cooling the electronic component 71 of the motor 100 .
- FIG. 9 is a side sectional view illustrating a configuration example of the dryer 300 in which the air blowing apparatus 200 is mounted.
- a front side of the dryer 300 in the air blowing direction corresponds to downward in the axial direction of the motor 100 .
- a back side of the dryer 300 in the air blowing direction corresponds to upward in the axial direction of the motor 100 .
- the dryer 300 is an electric machine for blowing hot air and is used as, for example, a household or commercial hairdryer for drying the head hair.
- the dryer 300 may be a dryer such as an industrial dryer for drying or heating matters other than the head hair.
- the dryer 300 includes the air blowing apparatus 200 having the motor 100 , the dryer housing 301 , a flow regulating member (not illustrated), and a heater (not illustrated).
- the dryer housing 301 has a tubular shape, an inlet port 301 a is opened in one end surface of the dryer housing 301 in the axial direction, and an outlet port 301 b is opened in the other end surface opposite to one end surface.
- An air blowing passage 301 c that connects the inlet port 301 a and the outlet port 301 b to each other is formed by an inner space of the dryer housing 301 .
- the air blowing apparatus 200 and the heater are disposed in the air blowing passage 301 c in this order from the upstream to the downstream in a circulating direction of the airflow (arrow S).
- the air blowing apparatus 200 is disposed between the inlet port 301 a and the heater.
- the impeller 101 of the air blowing apparatus 200 is disposed on the back side of the bracket 5 in the air blowing direction.
- the axial direction of the air blowing apparatus 200 is parallel to the air blowing direction of the dryer 300 .
- a plurality of stationary blades are disposed between the motor 100 and the dryer housing 301 side by side in the circumferential direction.
- the flow regulating member that regulates air is constituted by the plurality of stationary blades.
- the heater is disposed between the air blowing apparatus 200 and the outlet port 301 b.
- the heater is constituted by an electric heating wire such as a nichrome wire which generates heat by energization, and heats air sucked from the inlet port 301 a.
- the dryer 300 having the configuration described above, when a power supply switch (not illustrated) is turned on, the rotor 1 of the motor 100 rotates and the impeller 101 of the air blowing apparatus 200 rotates. Thereby, air is sucked from the outside of the dryer housing 301 via the inlet port 301 a and the airflow flowing into the air blowing passage 301 c is generated.
- the airflow flowing into the air blowing passage 301 c is sent outside in the radial direction and downward the air blowing apparatus 200 by the rotation of the impeller 101 .
- the airflow is guided between the plurality of the stationary blades by the inside surface of the dryer housing 301 and circulates toward the heater.
- the air flowing around the heater is heated by the heater.
- the heated air is blown out from the outlet port 301 b to the outside of the dryer housing 301 . Therefore, the dryer 300 can dry the head hair of a user or the like.
- part of the airflow circulating from the back side in the air blowing direction to the front side in the air blowing direction is guided inward in the radial direction by the guide portion 56 . Since at least a part of the guide portion 56 faces the electronic component 71 in the radial direction, the airflow guided inward in the radial direction hits the electronic component 71 .
- the airflow which hits the electronic component 71 is directed downward, is heated by the heater, and then is discharged from the outlet port 301 b to the outside of the dryer housing 301 . In this case, the air a temperature of which has not yet been increased by the heater hits the electronic component 71 . Therefore, it is possible to improve the efficiency of cooling the electronic component 71 of the motor 100 .
- a plurality of guide portions 56 may be provided side by side in the circumferential direction. Thereby, the airflow can hit the electronic component 71 from a plurality of directions according to the arrangement of the electronic component 71 . Accordingly, it is possible to improve the efficiency of cooling the electronic component 71 .
- a gap G between adjacent guide portions 56 penetrates in the axial direction. Therefore, the airflow flowing downward without being directed inside in the radial direction can be easily obtained.
- FIG. 11 is a front sectional view illustrating a circuit board 7 and a guide portion 56 of a motor 100 .
- an IC 71 e may be mounted to extend in the axial direction. That is, the IC 71 e may stand to be mounted on the circuit board 7 . In this case, a volume of air hitting the IC 71 e increases and it is possible to efficiently cool the IC 71 e at a high temperature.
- Another electronic component 71 other than the IC 71 e may be mounted to extend in the axial direction.
- FIG. 12 is a front sectional view illustrating a guide portion 56 of a motor 100 .
- a surface 56 a of the guide portion 56 inside in the radial direction may be inclined inward in the radial direction as it extends downward from an upper end to a lower end of the guide portion 56 .
- the motor 100 includes a body portion 10 having a rotor 1 that rotates around a center axis C extending in the top-bottom direction and has a magnet 13 , and a stator 2 that faces the magnet 13 in the radial direction.
- the motor 100 includes a circuit board 7 which is disposed below the body portion 10 and on which the electronic component 71 is mounted.
- the motor 100 includes a guide portion 56 that guides the airflow, which circulates downward in the top-bottom direction, toward inside in the radial direction below the body portion 10 . At least a part of the guide portion 56 faces the electronic component 71 in the radial direction. Therefore, the airflow guided inward in the radial direction by the guide portion 56 can hit the electronic component 71 . Therefore, it is possible to improve the efficiency of cooling the electronic component 71 .
- a bracket 5 attached to a lower portion of the stator 2 is provided and the bracket 5 includes a holding portion 51 that is disposed at the lower portion of the body portion 10 and holds the circuit board 7 , the guide portion 56 that is disposed outside in the radial direction and below the holding portion 51 , and a connecting portion 57 that connects the holding portion 51 and the guide portion 56 to each other.
- At least an upper portion of the surface 56 a inside the guide portion 56 in the radial direction is inclined inward in the radial direction as the at least an upper portion extends downward. Thereby, the airflow is smoothly guided inward in the radial direction and it is possible to improve the efficiency of cooling the electronic component 71 easily.
- the bracket 5 of the motor 100 has the guide portion 56 , it is possible to improve the efficiency of cooling the electronic component 71 irrespective of a shape of a casing of the electric machine or the like in which the motor 100 is mounted.
- the guide portion 56 is disposed outside the circuit board 7 in the radial direction. Therefore, when the circuit board 7 is attached to the holding portion 51 , it is possible to prevent interference between the guide portion 56 and the circuit board 7 . Therefore, it is possible to improve workability when the circuit board 7 is attached to the holding portion 51 .
- the guide portion 56 extends in the circumferential direction and a plurality of the connecting portions 57 are provided in the circumferential direction. Therefore, the guide portion 56 can be reinforced.
- the connecting portion 57 extends outside in the radial direction and downward from an outer peripheral end of the holding portion 51 . Thereby, the guide portion 56 can be easily disposed outside in the radial direction and below the holding portion 51 .
- the holding portion 51 includes a cylindrical portion 53 that covers at least a part of an outside surface of the body portion 10 above the circuit board 7 .
- the electronic component 71 is mounted on a lower surface of the circuit board 7 .
- a cutout portion 53 a is provided at the lower end of the cylindrical portion 53 . Therefore, heat can be prevented from being accumulated on the upper surface side of the circuit board 7 and it is possible to further improve the efficiency of cooling the electronic component 71 .
- At least a part of the outer edge portion of the circuit board 7 protrudes further outside in the radial direction than an outer edge of the cylindrical portion 53 when viewed in the axial direction. Therefore, part of the airflow directed downward in the top-bottom direction collides against the outer edge portion of the circuit board 7 and is easily guided inside in the radial direction via the cutout portion 53 a. Accordingly, the airflow is also circulated on the upper surface side of the circuit board 7 and it is possible to further improve the efficiency of cooling the electronic component 71 .
- the cutout portion 53 a is disposed at the position same as that of at least a part of the guide portion 56 in the circumferential direction. Thereby, it is possible to simultaneously cool the lower surface side and the upper surface side of the circuit board 7 of the electronic component 71 . That is, it is possible to simultaneously cool both sides of the mounting surface side of the electronic component 71 and a leg side of the electronic component 71 on the circuit board 7 .
- the bracket 5 includes a locking portion 59 for being locked to an inner wall of the duct through which the airflow circulates.
- the locking portion 59 is positioned outside the guide portion 56 in the radial direction. Thereby, the airflow directed downward in the axial direction without being directed inside in the radial direction can be easily obtained. Therefore, even if the motor 100 is disposed within the duct, it is possible to suppress decrease in the air blowing efficiency of the duct.
- a plurality of the guide portions 56 may be provided side by side in the circumferential direction. Thereby, the airflow can easily hit the electronic component 71 from a plurality of directions according to the arrangement of the electronic component 71 . Therefore, it is possible to further improve the efficiency of cooling the electronic component 71 .
- a gap G may penetrate in the axial direction between the adjacent guide portions 56 . Thereby, the airflow flowing downward in the axial direction without being directed inside in the radial direction can be easily obtained.
- the guide portion 56 has an arc shape the center of which is the center axis C when viewed in the axial direction. Therefore, while the airflow directed downward in the axial direction is obtained without being directed inside in the radial direction, the airflow hits the electronic component 71 from the plurality of the directions and it is possible to further improve the efficiency of cooling the electronic component 71 .
- the guide portion 56 has the arc shape, as compared to a case where the guide portion 56 has a circular shape the center of which is the center axis C when viewed in the axial direction, it is possible to reduce a weight of the motor 100 .
- the electronic components 71 and the guide portion 56 are disposed partially in a predetermined region in the circumferential direction, the airflow hits the electronic component 71 more efficiently.
- the electronic components 71 include an IC 71 e and an electrolytic capacitor 71 a.
- an inclination angle ⁇ (see FIG. 7 ) of at least the upper portion of the surface 56 a inside the guide portion 56 in the radial direction is 60 degrees or less with respect to the center axis C. Thereby, it is possible to suppress that the airflow circulating downward in the top-bottom direction collides against the surface 56 a inside the guide portion 56 in the radial direction to be directed upward or outward in the radial direction.
- the electronic component 71 is mounted to extend in the axial direction and faces the guide portion 56 in the radial direction, it is possible to increase a volume of the air hitting the electronic component 71 and it is possible to further improve the efficiency of cooling the electronic component 71 .
- the electronic components 71 may include the IC 71 e and the IC 71 e may be mounted to extend in the axial direction. Therefore, it is possible to increase the volume of the air hitting the IC 71 e and it is possible to efficiently cool the IC 71 e at high temperature.
- the air blowing apparatus 200 includes the motor 100 and the impeller 101 that is provided in the rotor 1 and rotates around the center axis C by driving the motor 100 , and the impeller 101 rotates to suck air from the upper side and exhaust the air to the lower side. Therefore, it is possible to easily realize the air blowing apparatus 200 in which the efficiency of cooling the electronic component 71 of the motor 100 is improved.
- FIG. 13 is a side sectional view of a dryer 300 in which an air blowing apparatus 200 including a motor 100 of the second embodiment is mounted.
- a front side of the dryer 300 in the air blowing direction corresponds to downward in the axial direction of the motor 100 .
- a back side of the dryer 300 in the air blowing direction corresponds to upward in the axial direction of the motor 100 .
- the same reference numerals are given to the same portions as those of the first embodiment illustrated in FIGS. 1 to 12 , which are described above.
- the arrangement of the guide portion 56 is different. The other portions are the same as those of the first embodiment.
- the motor 100 of the second embodiment includes a housing portion 80 that accommodates a body portion 10 therein.
- An air passage 81 is formed at a gap between an inside surface of the housing portion 80 and the body portion 10 .
- the air passage 81 communicates with an inlet port 301 a and an outlet port 301 b.
- the airflow (arrow S) circulates in the air passage 81 from the back side to the front side.
- the housing portion 80 is attached to a dryer housing 301 in the axial direction and the inside surface of the housing portion 80 is substantially parallel to the axial direction.
- the guide portion 56 is provided on the inside surface of the housing portion 80 .
- the guide portion 56 is disposed outside in the radial direction and below the body portion 10 .
- at least an upper portion of the surface 56 a inside the guide portion 56 in the radial direction is inclined inward in the radial direction as it extends downward.
- FIG. 14 is a sectional view perpendicular to the axial direction of the motor 100 .
- the guide portion 56 has an arc shape the center of which is the center axis C when viewed in the axial direction.
- a gap G penetrates in the axial direction between the adjacent guide portions 56 .
- the number of the guide portions 56 is not limited to four and may be plural other than four.
- the guide portion 56 may have a circular shape the center of which is the center axis C when viewed in the axial direction.
- the air blowing apparatus 200 when the air blowing apparatus 200 is driven, the airflow generated by the rotation of the impeller 101 circulates through the air passage 81 . Part of the airflow circulating through the air passage 81 is guided inward in the radial direction by the guide portion 56 . Thereby, similarly to the first embodiment, it is possible to efficiently cool the electronic component 71 .
- the inside surface of the housing portion 80 except for the guide portion 56 is substantially parallel to the axial direction. Therefore, a space of the inside of the housing portion 80 can be increased compared to a configuration in which an entire inside surface of the housing portion 80 , instead of the guide portion 56 , is inclined inward in the radial direction as the surface extends downward.
- the motor 100 includes a cylindrical housing portion 80 that accommodates a body portion 10 therein.
- the housing portion 80 forms the air passage 81 through which the airflow (arrow S) circulates in a gap between the housing portion 80 and the body portion 10 .
- the guide portion 56 is provided on the inside surface of the housing portion 80 and is disposed outside in the radial direction and below the body portion 10 . At least an upper portion of the surface 56 a inside the guide portion 56 in the radial direction is inclined inwardly in the radial direction as the least an upper portion extends downward. Therefore, similarly to the first embodiment, it is possible to improve the efficiency of cooling the electronic component 71 .
- a bracket 5 attached to a lower portion of the stator 2 is provided and the bracket 5 includes a holding portion 51 that is disposed at the lower portion of the body portion 10 and holds the circuit board 7 .
- the holding portion 51 includes a cylindrical portion 53 that covers at least a part of an outside surface of the body portion 10 above the circuit board 7 .
- the guide portion is disposed outside in the radial direction and below the holding portion 51 .
- the electronic component 71 is mounted on the lower surface of the circuit board 7 .
- a cutout portion 53 a is provided at a lower end of the cylindrical portion 53 . Therefore, similarly to the first embodiment, heat can be prevented from being accumulated on the upper surface side of the circuit board 7 and it is possible to further improve the efficiency of cooling the electronic component 71 .
- At least a part of the outer edge portion of the circuit board 7 protrudes further outside in the radial direction than an outer edge of the cylindrical portion 53 when viewed in the axial direction. Therefore, similarly to the first embodiment, the airflow is also easily circulated on the upper surface side of the circuit board 7 and it is possible to further improve the efficiency of cooling the electronic component 71 .
- the cutout portion 53 a is disposed at the position same as that of at least a part of the guide portion 56 in the circumferential direction. Therefore, similarly to the first embodiment, it is possible to simultaneously cool the mounting surface side of the electronic component 71 and a leg side of the electronic component 71 on the circuit board 7 .
- the motor 100 of the first embodiment and the second embodiment is an outer rotor motor, but it may be an inner rotor motor.
- the electronic component 71 is mounted on the lower surface of the circuit board 7 , but it may be mounted on the upper surface of the circuit board 7 .
- the motor 100 is mounted in the dryer 300 , but it may be mounted in an electric machine other than the dryer 300 .
- the motor 100 may be mounted in an electric fan, a ventilating fan, a vacuum cleaner, a hair steamer, or the like.
- the invention can be used, for example, for a motor including a circuit board on which an electronic component is mounted and an air blowing apparatus including the same.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
A motor includes a body portion, a circuit board, and a guide portion. The body portion includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction. The circuit board is disposed below the body portion and has an electronic component mounted thereon. The guide portion guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion. At least a part of the guide portion faces the electronic component in the radial direction.
Description
- This application claims the benefit of priority to Japanese Patent Application No. 2017-009012 filed on Jan. 20, 2017. The entire contents of this application are hereby incorporated herein by reference.
- The present invention relates to a motor and an air blowing apparatus including the same.
- A fan including an impeller unit, a motor unit, and a fan base is disclosed in Japanese Unexamined Patent Application Publication No. 2006-177309. The motor unit has a circuit board. The fan base is provided with at least one pillow portion. The pillow portion of the fan base faces an impeller boss to form an air vent and a flow passage so that part of a fluid driven by the rotation of the fan is guided into the boss to dissipate heat with respect to the entire motor accommodated in the boss.
- According to the motor unit described in Japanese Unexamined Patent Application No. 2006-177309, part of the fluid flowing in from the air vent by the rotation of the fan is not guided to the circuit board within the impeller boss. On the other hand, if a distance between the fan base and the circuit board is decreased, a height of the pillow portion is reduced in order to prevent interference between the pillow portion and a blade. Therefore, an amount of fluid flowing into the impeller boss decreases, and an airflow does not sufficiently hit an electronic component of the circuit board. Therefore, there is a problem that an efficiency of cooling the electronic component is low.
- An exemplary motor of the invention includes a body portion, a circuit board, and a guide portion. The body portion includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction. The circuit board is disposed below the body portion and has an electronic component mounted thereon. The guide portion guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion. At least a part of the guide portion faces the electronic component in the radial direction.
- An exemplary air blowing apparatus of the invention includes the motor having the above-described configuration, and an impeller that is provided in the rotor and rotates around the center axis by driving the motor. The impeller rotates to suck air from an upper side and exhaust the air to a lower side.
- According to the exemplary invention, it is possible to provide the motor capable of increasing an efficiency of cooling the electronic component, and the air blowing apparatus including the same.
- The above and other elements, features, steps, characteristics and advantages of the present discloser will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.
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FIG. 1 is a perspective view illustrating an air blowing apparatus including a motor according to a first embodiment of the invention. -
FIG. 2 is a top view illustrating the air blowing apparatus including the motor according to the first embodiment of the invention. -
FIG. 3 is a sectional view taken along a line A-O-A ofFIG. 2 . -
FIG. 4 is a perspective view, when viewed from below, of the air blowing apparatus including the motor according to the first embodiment of the invention. -
FIG. 5 is a perspective view, when viewed from below, of the air blowing apparatus from which a circuit board of the motor according to the first embodiment of the invention is removed. -
FIG. 6 is a bottom view illustrating the air blowing apparatus from which the circuit board of the motor according to the first embodiment of the invention is removed. -
FIG. 7 is an enlarged side sectional view illustrating an enlarged peripheral portion of the air blowing apparatus including the motor according to the first embodiment of the invention. -
FIG. 8 is a perspective view of an insulator of the motor according to the first embodiment of the invention when viewed from below. -
FIG. 9 is a side sectional view illustrating a dryer in which the air blowing apparatus including the motor according to the first embodiment of the invention is mounted. -
FIG. 10 is a top view illustrating an air blowing apparatus including a motor according to a first modification example of the first embodiment of the invention. -
FIG. 11 is a front sectional view illustrating a circuit board and a guide portion of a motor according to a second modification example of the first embodiment of the invention. -
FIG. 12 is a front sectional view of a guide portion of a motor according to a third modification example of the first embodiment of the invention. -
FIG. 13 is a side sectional view of a dryer in which an air blowing apparatus including a motor according to a second embodiment of the invention is mounted. -
FIG. 14 is a sectional view perpendicular to an axial direction of the motor according to the second embodiment of the invention. - Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. In the present specification, a direction in which a center axis C extends with respect to a
motor 100 and an air blowingapparatus 200 is simply referred to as an “axial direction”. Furthermore, a direction from acircuit board 7 to abody portion 10 is simply referred to as “upward” and a direction from thebody portion 10 to thecircuit board 7 is simply referred to as “downward” in the axial direction. In addition, a surface facing upward in the axial direction is referred to as an “upper surface” and a surface facing downward in the axial direction is referred to as a “lower surface” on a surface of each configuration element. - A radial direction with respect to the center axis C is simply referred to as a “radial direction” and a circumferential direction around the center axis C is simply referred to as a “circumferential direction”. Furthermore, a direction toward the center axis C is simply referred to as “inside” and a direction away from the center axis C is simply referred to as “outside” in the radial direction. Furthermore, a side surface facing inside in the radial direction is referred to as an “inside surface” and a side surface facing outside in the radial direction is referred to as an “outside surface” on the surface of each configuration element.
- With respect to an apparatus or a machine including the
motor 100, a direction of an airflow sent from theair blowing apparatus 200 is referred to as an “air blowing direction”. In addition, a direction from an upstream to a downstream in the air blowing direction is simply referred to as “front side” and a direction from the downstream to the upstream is simply referred to as “back side” in the air blowing direction. - The terms of the directions and the surfaces which are described above are not intended to limit a positional relationship, a direction, and the like in a case of being incorporated in an actual machine.
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FIG. 1 is a perspective view illustrating theair blowing apparatus 200 including themotor 100 according to a first embodiment of the invention.FIG. 2 is a top view illustrating theair blowing apparatus 200.FIG. 3 is a sectional view taken along a line A-O-A ofFIG. 2 . The air blowingapparatus 200 includes themotor 100 and animpeller 101. - The
impeller 101 is an impeller attached to themotor 100 from an upper side and includes a plurality ofblades 101 a, aperipheral wall member 101 b, and abase portion 101 c. Thebase portion 101 c has an umbrella shape and a diameter of a section of thebase portion 101 c in the axial direction increases as thebase portion 101 c extends downward. That is, the inner diameter of thebase portion 101 c is gradually increased downward. The plurality ofblades 101 a are disposed on an outside surface of thebase portion 101 c side by side in the circumferential direction. Theperipheral wall member 101 b is formed in a cylindrical shape and protrudes downward from the inside surface of thebase portion 101 c. Theimpeller 101 rotates around the center axis C extending in a top-bottom direction by driving themotor 100 and generates airflow. - The
motor 100 is a driving device which drives and rotates theimpeller 101 and, for example, is mounted in an electric machine such as a dryer 300 (seeFIG. 9 described later). Themotor 100 includes thebody portion 10, abearing holder 4, abracket 5, atie pin 6, and thecircuit board 7. - The
body portion 10 has arotor 1 and astator 2. Therotor 1 is a rotor of themotor 100 and has ashaft 11, arotor holder 12, and amagnet 13. Theshaft 11 is disposed on a rotation axis extending in a top-bottom direction (direction of the center axis C). Therotor holder 12 holds themagnet 13 and is rotatable together with theshaft 11 and theimpeller 101. Themotor 100 is an outer rotor motor. Themagnet 13 is disposed outside thestator 2 in the radial direction and faces thestator 2 in the radial direction. - The
rotor holder 12 is disposed inside theperipheral wall member 101 b of theimpeller 101 in the radial direction and accommodates thestator 2 therein. Therotor holder 12 includes a disk-shapedlid portion 121 and a tubularcylindrical portion 122. Thelid portion 121 extends outward from theshaft 11 in the radial direction. Thecylindrical portion 122 extends downward in the axial direction from an outer peripheral edge of thelid portion 121. Theperipheral wall member 101 b of theimpeller 101 is attached to the outside of thecylindrical portion 122 in the radial direction. Themagnet 13 is held on the inside surface of thecylindrical portion 122. - The
stator 2 is an armature of themotor 100 and is held on the outside surface of thebearing holder 4. Thestator 2 faces therotor 1 in the radial direction and drives and rotates therotor 1. Thestator 2 includes astator core 21, a plurality ofcoil portions 22, and aninsulator 23. - The
stator core 21 is a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction, and is disposed outside thebearing holder 4 in the radial direction and inside themagnet 13 in the radial direction. - Each of the
coil portions 22 is a winding member in which a conductor wire (for example, a lead wire 221) is wound around theinsulator 23, and is arranged in the circumferential direction. The end portion of thelead wire 221 is tied to thetie pin 6 in a state where an insulating layer is peeled off. Thetie pin 6 constitutes a terminal for electrically connecting thecoil portion 22 and thecircuit board 7 to each other. - The
insulator 23 is an insulating member formed of, for example, resin and covers thestator core 21. Thestator core 21 and thecoil portion 22 are electrically separated by theinsulator 23. Theinsulator 23 has a support member 3 (see alsoFIG. 8 ) that supports thetie pin 6. Thesupport member 3 protrudes from a lower end of theinsulator 23 to thecircuit board 7. Thesupport member 3 includes apin support portion 31 that supports thetie pin 6 and apin connecting portion 32 that connects the adjacent pin support portions 31 (seeFIG. 8 ) to one another. - The
bearing holder 4 is formed of, for example, a metal and holds abearing 41 above and abearing 42 below. Thebearing holder 4 is disposed outside theshaft 11 in the radial direction and inside thestator 2 in the radial direction. Thebearings shaft 11. For example, a ball bearing, a sleeve bearing, or the like is used as thebearings - The
bearing holder 4 includes acylindrical portion 4 a extending in the axial direction and arectangular plate portion 4 b. Thebearings cylindrical portion 4 a. Theplate portion 4 b extends outside in the radial direction from a periphery of a lower end portion of thecylindrical portion 4 a. In the axial direction, a position of a lower surface of theplate portion 4 b near thecylindrical portion 4 a is substantially the same as a position of a lower surface of acover plate 52 of thebracket 5. An upper surface and a lower surface of both end portions of theplate portion 4 b in a longitudinal direction are caught in thecover plate 52. Therefore, thebearing holder 4 is held by thebracket 5. In the embodiment, theplate portion 4 b and thecylindrical portion 4 a are formed of different members, but may be constituted by a single member. -
FIG. 4 is a bottom view illustrating theair blowing apparatus 200. Thecircuit board 7 is disposed below thebody portion 10. Thecircuit board 7 has a substantially disk shape and is formed of, for example, resin such as epoxy resin. As described below, thecircuit board 7 is held by thebracket 5. - The
circuit board 7 includes a plurality offirst holes 72, a plurality ofsecond holes 73, and a plurality ofboard cutout portions 74. In the embodiment, thecircuit board 7 includes threefirst holes 72, threesecond holes 73, and twoboard cutout portions 74. Thefirst holes 72 and thesecond holes 73 are through-holes that penetrate thecircuit board 7 from the upper surface to the lower surface. Theboard cutout portions 74 are formed at two positions on a peripheral edge of thecircuit board 7. Twoboard cutout portions 74 are opposite to each other with theshaft 11 therebetween when viewed in the axial direction. - An
electronic component 71 is mounted on the lower surface of thecircuit board 7. Theelectronic component 71 includes an AC/DC converter, an inverter, a control circuit, a position detection circuit, and the like. The control circuit controls the rotation of therotor 1 and includes anIC 71 e. TheIC 71 e is mounted to extend in a direction perpendicular to the axial direction. There is no particular limitation on theIC 71 e, but for example, an intelligent power module (IPM) can be used. - The AC/DC converter is, for example, a conversion circuit that converts AC power supply supplied from a commercial power supply (not illustrated) to DC power. The AC/DC converter includes elements which are relatively large and heavy such as an
electrolytic capacitor 71 a and achoke coil 71 b. - The
electrolytic capacitor 71 a is an electric storage element that stores charge of relatively high capacity. Thechoke coil 71 b is a winding member in which a winding is wound around an iron core and functions as a noise filter for removing noise of power supply of themotor 100. The inverter is a power supply circuit that supplies supply power to thestator 2 and supply power is generated by using DC electric power output from the AC/DC converter. - The position detection circuit is a detection portion that detects the position (that is, a rotation angle) of the
rotor 1 based on an induced voltage generated in thecoil portion 22 of thestator 2 due to the rotation of therotor 1. The induced voltage is a voltage generated in thecoil portion 22 by a magnetic force of themagnet 13 when therotor 1 is rotated. - Since the
electronic component 71 is mounted on the lower surface of thecircuit board 7, the shortest distance between thestator 2 and thecircuit board 7 is shorter than that of a case where theelectronic component 71 is mounted on the upper surface of thecircuit board 7. In addition, the shortest distance between thestator 2 and thecircuit board 7 is not affected by the size of theelectronic component 71 mounted on thecircuit board 7 in the axial direction. Therefore, even if an element, of which particularly the size in the axial direction is relatively large such as theelectrolytic capacitor 71 a used in the AC/DC converter, is mounted on thecircuit board 7, it is possible to prevent an increase in the distance between thestator 2 and thecircuit board 7. Therefore, it is possible to reduce disconnection of the wiring (particularly, the lead wire 221) between thestator 2 and thecircuit board 7. -
FIG. 5 is a perspective view of theair blowing apparatus 200 from which thecircuit board 7 is removed when viewed from below.FIG. 6 is a bottom view (lower view) illustrating theair blowing apparatus 200 from which thecircuit board 7 is removed. Thebracket 5 is attached to the lower portion of thestator 2. Thebracket 5 is formed by, for example, injection molding using a resin material and includes a holdingportion 51, aguide portion 56, a connectingportion 57, and a lockingportion 59. - The holding
portion 51 is disposed at the lower portion of thebody portion 10 and holds thecircuit board 7. The holdingportion 51 includes thecover plate 52, acylindrical portion 53, a plurality ofboard support portions 54, and a plurality of thehook members 55. In the embodiment, threeboard support portions 54 are provided and twohook members 55 are provided. - The
cylindrical portion 53 has a substantially circular cross section perpendicular to the axial direction and covers at least a part of the outside surface of thebody portion 10 above thecircuit board 7. The outside surface of thecylindrical portion 53 is provided with a pair of the lockingportions 59. - The
board support portion 54 and thehook member 55 are provided at the lower end of thecylindrical portion 53. In addition, acutout portion 53 a is provided at the lower end of thecylindrical portion 53. At least a part of the outer edge portion of thecircuit board 7 protrudes further outside in the radial direction than the outer edge of thecylindrical portion 53 when viewed in the axial direction. - The
cover plate 52 holds theplate portion 4 b of thebearing holder 4. Both ends of thecover plate 52 in the longitudinal direction are connected to thecylindrical portion 53 at two positions where the pair of the lockingportions 59 is connected to the holdingportion 51 when viewed in the axial direction. Therefore, twobracket opening portions cylindrical portion 53 and thecover plate 52 in a lateral direction of thecover plate 52. - The pair of locking
portions 59 are opposite to each other with theshaft 11 therebetween and protrudes further outward than theguide portion 56 in the radial direction. The lockingportions 59 are a member for being locked to an inner wall of the duct through which the airflow circulates. The lockingportions 59 are locked to a groove portion (not illustrated) provided in the inner wall of the duct. Thereby, themotor 100 is attached to an electric machine in which theair blowing apparatus 200 is mounted. As illustrated inFIG. 9 , in the embodiment, the duct is adryer housing 301 of thedryer 300. The lockingportions 59 are locked to a groove portion (not illustrated) provided in an inner wall of thedryer housing 301. Thereby, themotor 100 is attached to thedryer 300 which will be described later. - The longitudinal direction of the
cover plate 52 is parallel to a connecting line which connects a center of a portion of the peripheral edge of the lower end of thecylindrical portion 53 connected to one of the pair of the lockingportions 59 and a center of a portion of the peripheral edge of the lower end of thecylindrical portion 53 connected to the other of the pair of the lockingportions 59 to each other when viewed in the axial direction. That is, both ends of thecover plate 52 in the longitudinal direction are connected to thecylindrical portion 53 at two positions when viewed in the axial direction. Thecover plate 52 is connected to thecylindrical portion 53 at two positions where vibration of themotor 100 is very easily transmitted. Therefore, the vibration of themotor 100 can be efficiently transmitted to the electric machine. Therefore, it is possible to reduce an eigenvalue (vibration frequency) generated in thebracket 5. Furthermore, it is possible to increase an attaching strength when themotor 100 is attached to the electric machine. - The
cover plate 52 includes aconnection opening portion 521, twofirst protrusion portions 522 and twosecond protrusion portions 523. Theconnection opening portion 521 penetrates thecover plate 52 from the upper surface to the lower surface. Thefirst protrusion portion 522 and thesecond protrusion portion 523 are provided at a peripheral edge of theconnection opening portion 521. - The
board support portion 54 is provided at the peripheral edge of the lower end of thecylindrical portion 53. Theboard support portion 54 includes astopper portion 541 and acolumn portion 542. Thestopper portion 541 protrudes downward from the lower end of thecylindrical portion 53 in the axial direction. Thecolumn portion 542 is provided inside thestopper portion 541 in the radial direction and on the inside surface of thecylindrical portion 53, and protrudes further downward than the lower end of thestopper portion 541 in the axial direction. - The
hook member 55 is provided at the lower end of thecylindrical portion 53. Thehook member 55 includes anextension portion 551 and aclaw portion 552. Theextension portion 551 extends from thecylindrical portion 53 toward thecircuit board 7. Theclaw portion 552 protrudes from theextension portion 551 toward thecircuit board 7. Specifically, theextension portion 551 extends downward in the axial direction from the peripheral edge of the lower end of thecylindrical portion 53 toward thecircuit board 7. Theclaw portion 552 protrudes inside in the radial direction from the inside surface of theextension portion 551 toward thecircuit board 7. - When the
motor 100 is assembled, thetie pin 6 is inserted into the first hole 72 (seeFIG. 4 ) and penetrates thefirst hole 72. Thetie pin 6 is soldered to thecircuit board 7 and is electrically connected to thecircuit board 7. Theboard support portion 54 is press-fitted into the second hole 73 (seeFIG. 4 ). Thehook member 55 is attached to theboard cutout portion 74 by snap-fitting. That is, thehook member 55 is engaged with theboard cutout portion 74 by elastic deformation. Thecircuit board 7 is held by the holdingportion 51 of thebracket 5 by a press fitting structure by theboard support portion 54, a snap fit structure by thehook member 55, and a soldering structure of thetie pin 6. -
FIG. 7 is an enlarged side sectional view illustrating an enlarged peripheral portion of theair blowing apparatus 200. As illustrated inFIGS. 1 and 2 , theguide portion 56 has an arc shape (a portion of the circumference) the center of which is the center axis C when viewed in the axial direction. In the embodiment, theguide portion 56 has a semicircular circumferential shape when viewed in the axial direction. That is, theguide portion 56 extends in a circumferential direction. Theguide portion 56 is disposed outside in the radial direction and below thebody portion 10 and the holdingportion 51, and at least a part of theguide portion 56 faces theelectronic component 71 on thecircuit board 7 in the radial direction. In addition, the lower end of theguide portion 56 is disposed above the lower end of theelectronic component 71. - The
guide portion 56 is disposed outside thecircuit board 7 in the radial direction. At least an upper portion of asurface 56 a inside theguide portion 56 in the radial direction is inclined inside in the radial direction as the upper portion extends downward. At least a part of theguide portion 56 is disposed at the position same as that of thecutout portion 53 a of thecylindrical portion 53 in the circumferential direction. That is, thecutout portion 53 a is disposed at the position same as that of at least a part of theguide portion 56 in the circumferential direction. As described below, theguide portion 56 guides the airflow (arrow S inFIG. 1 and the like), which circulates in the top-bottom direction, downward and inside thebody portion 10 in the radial direction. - That is, the
motor 100 includes thebody portion 10 having therotor 1 that rotates around the center axis C extending in the top-bottom direction and has themagnet 13, and thestator 2 that faces themagnet 13 in the radial direction. Themotor 100 includes thecircuit board 7 which is disposed below thebody portion 10 and on which theelectronic component 71 is mounted. Themotor 100 includes theguide portion 56 that guides the airflow, which circulates downward in the top-bottom direction, toward inside in the radial direction below thebody portion 10. At least a part of theguide portion 56 faces theelectronic component 71 in the radial direction. - A plurality of the connecting
portions 57 are disposed side by side in the circumferential direction and extend outside in the radial direction and downward from the outer peripheral end of the holdingportion 51. Specifically, the connectingportions 57 extend outside in the radial direction and downward from the outside surface of thecylindrical portion 53 of the holdingportion 51. The connectingportion 57 connects the holdingportion 51 and theguide portion 56 to each other. The lockingportion 59 is provided to protrude outside in the radial direction from the outer periphery portion of the connectingportion 57. In the embodiment, four connectingportions 57 are disposed in the circumferential direction. -
FIG. 8 is a perspective view of theinsulator 23 when view from below. Upward inFIG. 8 corresponds to downward in FIG. 3 and downward inFIG. 8 corresponds to upward inFIG. 3 . - The
support member 3 supports thetie pin 6 and protrudes downward (upward inFIG. 8 ) from the lower end of theinsulator 23. Since thetie pin 6 is supported by thesupport member 3, even in a case where the vibration of themotor 100 is generated, the wiring between thecoil portion 22 and thecircuit board 7 can be stabilized. - The
support member 3 is disposed within the connection opening portion 521 (seeFIG. 5 ) when viewed in the axial direction and penetrates theconnection opening portion 521 to extend in the axial direction. Thetie pin 6 extends downward from a tip (lower end) of thesupport member 3, is inserted into the first hole 72 (seeFIG. 4 ) of thecircuit board 7, and is soldered to thecircuit board 7. Thereby, thecoil portion 22 is electrically connected to a wiring pattern on thecircuit board 7 via theconnection opening portion 521. - The
support member 3 includes threepin support portions 31 and twopin connecting portions 32. The number of thepin support portions 31 is not limited to three and may be plural other than three. Each of thepin support portions 31 protrudes from theinsulator 23 toward thecircuit board 7 below and supports thetie pin 6. Thepin connecting portion 32 connects adjacentpin support portions 31 to one another. - The
first protrusion portion 522 and thesecond protrusion portion 523 are provided at the peripheral edge of theconnection opening portion 521 in thecover plate 52. Thefirst protrusion portion 522 protrudes outside in the radial direction from the peripheral edge of theconnection opening portion 521 and is in contact with the inside surface of thepin connecting portion 32 of thesupport member 3. Thesecond protrusion portion 523 protrudes inside in the radial direction from the peripheral edge of theconnection opening portion 521 and is in contact with the outside surface of thepin connecting portion 32 of thesupport member 3. - Thereby, a displacement of the
support member 3 inside in the radial direction and a displacement outside in the radial direction are suppressed and the strength of thesupport member 3 can be improved. In addition, the vibration of themotor 100 transmitted from thecover plate 52 via thefirst protrusion portion 522 and thesecond protrusion portion 523 can be reduced by thepin connecting portion 32 and is unlikely to be transmitted to thepin support portion 31. Therefore, even in a case where the vibration of thetie pin 6 is generated, the wiring (particularly, the lead wire 221) between thecoil portion 22 and thecircuit board 7 can be stabilized. - In the
air blowing apparatus 200 having the configuration described above, when electric power is supplied to thecoil portion 22 via thelead wire 221, a magnetic flux is generated in thestator core 21. A torque is generated in the circumferential direction by an operation of the magnetic flux between thestator core 21 and themagnet 13. As a result, therotor 1 rotates around the center axis C with respect to thestator 2 in a rotation direction R (seeFIGS. 1 and 2 ). - When the
rotor 1 rotates, theimpeller 101 rotates in the rotation direction R and air is sucked from the upper side of theimpeller 101. The air sucked from the upper side circulates between theadjacent blades 101 a and is accelerated outward in the radial direction and downward by the rotatingimpeller 101. The air which is accelerated outward in the radial direction and downward is exhausted further downward than theimpeller 101. - That is, the
air blowing apparatus 200 includes themotor 100, and theimpeller 101 that is provided in therotor 1 and is rotated around the center axis C by driving themotor 100. Theimpeller 101 rotates to suck air from the upper side and exhaust the air to the lower side. Therefore, as indicated by an arrow S (seeFIGS. 1 and 3 ), the airflow circulating downward in the top-bottom direction is generated. - The
motor 100 includes theguide portion 56. That is, in this case, the airflow circulating downward in the top-bottom direction is guided inward in the radial direction below thebody portion 10 by theguide portion 56. At least a part of theguide portion 56 faces theelectronic component 71 in the radial direction. Therefore, part of the airflow circulating downward in the top-bottom direction is guided inward in the radial direction and the airflow guided inward in the radial direction hits theelectronic component 71. The airflow hitting theelectronic component 71 is directed downward. Therefore, it is possible to improve the efficiency of cooling theelectronic component 71 of themotor 100. - Next, the
dryer 300 will be described below as an application example of the electric machine in which theair blowing apparatus 200 including themotor 100 according to the embodiment is mounted.FIG. 9 is a side sectional view illustrating a configuration example of thedryer 300 in which theair blowing apparatus 200 is mounted. A front side of thedryer 300 in the air blowing direction corresponds to downward in the axial direction of themotor 100. A back side of thedryer 300 in the air blowing direction corresponds to upward in the axial direction of themotor 100. - The
dryer 300 is an electric machine for blowing hot air and is used as, for example, a household or commercial hairdryer for drying the head hair. Thedryer 300 may be a dryer such as an industrial dryer for drying or heating matters other than the head hair. - The
dryer 300 includes theair blowing apparatus 200 having themotor 100, thedryer housing 301, a flow regulating member (not illustrated), and a heater (not illustrated). Thedryer housing 301 has a tubular shape, aninlet port 301 a is opened in one end surface of thedryer housing 301 in the axial direction, and anoutlet port 301 b is opened in the other end surface opposite to one end surface. - An
air blowing passage 301 c that connects theinlet port 301 a and theoutlet port 301 b to each other is formed by an inner space of thedryer housing 301. Theair blowing apparatus 200 and the heater are disposed in theair blowing passage 301 c in this order from the upstream to the downstream in a circulating direction of the airflow (arrow S). - The
air blowing apparatus 200 is disposed between theinlet port 301 a and the heater. Theimpeller 101 of theair blowing apparatus 200 is disposed on the back side of thebracket 5 in the air blowing direction. The axial direction of theair blowing apparatus 200 is parallel to the air blowing direction of thedryer 300. - A plurality of stationary blades (not illustrated) are disposed between the
motor 100 and thedryer housing 301 side by side in the circumferential direction. The flow regulating member that regulates air is constituted by the plurality of stationary blades. - The heater is disposed between the
air blowing apparatus 200 and theoutlet port 301 b. The heater is constituted by an electric heating wire such as a nichrome wire which generates heat by energization, and heats air sucked from theinlet port 301 a. - In the
dryer 300 having the configuration described above, when a power supply switch (not illustrated) is turned on, therotor 1 of themotor 100 rotates and theimpeller 101 of theair blowing apparatus 200 rotates. Thereby, air is sucked from the outside of thedryer housing 301 via theinlet port 301 a and the airflow flowing into theair blowing passage 301 c is generated. The airflow flowing into theair blowing passage 301 c is sent outside in the radial direction and downward theair blowing apparatus 200 by the rotation of theimpeller 101. The airflow is guided between the plurality of the stationary blades by the inside surface of thedryer housing 301 and circulates toward the heater. The air flowing around the heater is heated by the heater. The heated air is blown out from theoutlet port 301 b to the outside of thedryer housing 301. Therefore, thedryer 300 can dry the head hair of a user or the like. - In this case, part of the airflow circulating from the back side in the air blowing direction to the front side in the air blowing direction is guided inward in the radial direction by the
guide portion 56. Since at least a part of theguide portion 56 faces theelectronic component 71 in the radial direction, the airflow guided inward in the radial direction hits theelectronic component 71. The airflow which hits theelectronic component 71 is directed downward, is heated by the heater, and then is discharged from theoutlet port 301 b to the outside of thedryer housing 301. In this case, the air a temperature of which has not yet been increased by the heater hits theelectronic component 71. Therefore, it is possible to improve the efficiency of cooling theelectronic component 71 of themotor 100. - As illustrated in
FIG. 10 , a plurality ofguide portions 56 may be provided side by side in the circumferential direction. Thereby, the airflow can hit theelectronic component 71 from a plurality of directions according to the arrangement of theelectronic component 71. Accordingly, it is possible to improve the efficiency of cooling theelectronic component 71. In addition, a gap G betweenadjacent guide portions 56 penetrates in the axial direction. Therefore, the airflow flowing downward without being directed inside in the radial direction can be easily obtained. -
FIG. 11 is a front sectional view illustrating acircuit board 7 and aguide portion 56 of amotor 100. As illustrated inFIG. 11 , anIC 71 e may be mounted to extend in the axial direction. That is, theIC 71 e may stand to be mounted on thecircuit board 7. In this case, a volume of air hitting theIC 71 e increases and it is possible to efficiently cool theIC 71 e at a high temperature. Anotherelectronic component 71 other than theIC 71 e may be mounted to extend in the axial direction. -
FIG. 12 is a front sectional view illustrating aguide portion 56 of amotor 100. As illustrated inFIG. 12 , asurface 56 a of theguide portion 56 inside in the radial direction may be inclined inward in the radial direction as it extends downward from an upper end to a lower end of theguide portion 56. Thereby, it is possible to guide the airflow inside in the radial direction while suppressing an increase in a length of theguide portion 56 in the axial direction. - According to the embodiment, the
motor 100 includes abody portion 10 having arotor 1 that rotates around a center axis C extending in the top-bottom direction and has amagnet 13, and astator 2 that faces themagnet 13 in the radial direction. Themotor 100 includes acircuit board 7 which is disposed below thebody portion 10 and on which theelectronic component 71 is mounted. Themotor 100 includes aguide portion 56 that guides the airflow, which circulates downward in the top-bottom direction, toward inside in the radial direction below thebody portion 10. At least a part of theguide portion 56 faces theelectronic component 71 in the radial direction. Therefore, the airflow guided inward in the radial direction by theguide portion 56 can hit theelectronic component 71. Therefore, it is possible to improve the efficiency of cooling theelectronic component 71. - A
bracket 5 attached to a lower portion of thestator 2 is provided and thebracket 5 includes a holdingportion 51 that is disposed at the lower portion of thebody portion 10 and holds thecircuit board 7, theguide portion 56 that is disposed outside in the radial direction and below the holdingportion 51, and a connectingportion 57 that connects the holdingportion 51 and theguide portion 56 to each other. At least an upper portion of thesurface 56 a inside theguide portion 56 in the radial direction is inclined inward in the radial direction as the at least an upper portion extends downward. Thereby, the airflow is smoothly guided inward in the radial direction and it is possible to improve the efficiency of cooling theelectronic component 71 easily. In addition, since thebracket 5 of themotor 100 has theguide portion 56, it is possible to improve the efficiency of cooling theelectronic component 71 irrespective of a shape of a casing of the electric machine or the like in which themotor 100 is mounted. - The
guide portion 56 is disposed outside thecircuit board 7 in the radial direction. Therefore, when thecircuit board 7 is attached to the holdingportion 51, it is possible to prevent interference between theguide portion 56 and thecircuit board 7. Therefore, it is possible to improve workability when thecircuit board 7 is attached to the holdingportion 51. - The
guide portion 56 extends in the circumferential direction and a plurality of the connectingportions 57 are provided in the circumferential direction. Therefore, theguide portion 56 can be reinforced. - The connecting
portion 57 extends outside in the radial direction and downward from an outer peripheral end of the holdingportion 51. Thereby, theguide portion 56 can be easily disposed outside in the radial direction and below the holdingportion 51. - The holding
portion 51 includes acylindrical portion 53 that covers at least a part of an outside surface of thebody portion 10 above thecircuit board 7. Theelectronic component 71 is mounted on a lower surface of thecircuit board 7. Acutout portion 53 a is provided at the lower end of thecylindrical portion 53. Therefore, heat can be prevented from being accumulated on the upper surface side of thecircuit board 7 and it is possible to further improve the efficiency of cooling theelectronic component 71. - At least a part of the outer edge portion of the
circuit board 7 protrudes further outside in the radial direction than an outer edge of thecylindrical portion 53 when viewed in the axial direction. Therefore, part of the airflow directed downward in the top-bottom direction collides against the outer edge portion of thecircuit board 7 and is easily guided inside in the radial direction via thecutout portion 53 a. Accordingly, the airflow is also circulated on the upper surface side of thecircuit board 7 and it is possible to further improve the efficiency of cooling theelectronic component 71. - The
cutout portion 53 a is disposed at the position same as that of at least a part of theguide portion 56 in the circumferential direction. Thereby, it is possible to simultaneously cool the lower surface side and the upper surface side of thecircuit board 7 of theelectronic component 71. That is, it is possible to simultaneously cool both sides of the mounting surface side of theelectronic component 71 and a leg side of theelectronic component 71 on thecircuit board 7. - The
bracket 5 includes a lockingportion 59 for being locked to an inner wall of the duct through which the airflow circulates. The lockingportion 59 is positioned outside theguide portion 56 in the radial direction. Thereby, the airflow directed downward in the axial direction without being directed inside in the radial direction can be easily obtained. Therefore, even if themotor 100 is disposed within the duct, it is possible to suppress decrease in the air blowing efficiency of the duct. - A plurality of the
guide portions 56 may be provided side by side in the circumferential direction. Thereby, the airflow can easily hit theelectronic component 71 from a plurality of directions according to the arrangement of theelectronic component 71. Therefore, it is possible to further improve the efficiency of cooling theelectronic component 71. - In this case, a gap G may penetrate in the axial direction between the
adjacent guide portions 56. Thereby, the airflow flowing downward in the axial direction without being directed inside in the radial direction can be easily obtained. - The
guide portion 56 has an arc shape the center of which is the center axis C when viewed in the axial direction. Therefore, while the airflow directed downward in the axial direction is obtained without being directed inside in the radial direction, the airflow hits theelectronic component 71 from the plurality of the directions and it is possible to further improve the efficiency of cooling theelectronic component 71. In addition, if theguide portion 56 has the arc shape, as compared to a case where theguide portion 56 has a circular shape the center of which is the center axis C when viewed in the axial direction, it is possible to reduce a weight of themotor 100. - For example, as illustrated in
FIG. 4 , if theelectronic components 71 and theguide portion 56 are disposed partially in a predetermined region in the circumferential direction, the airflow hits theelectronic component 71 more efficiently. In addition, while reducing the weight of themotor 100, it is possible to obtain the airflow directed downward in the axial direction without being directed inside in the radial direction. In the embodiment, theelectronic components 71 include anIC 71 e and anelectrolytic capacitor 71 a. - It is desirable that an inclination angle θ (see
FIG. 7 ) of at least the upper portion of thesurface 56 a inside theguide portion 56 in the radial direction is 60 degrees or less with respect to the center axis C. Thereby, it is possible to suppress that the airflow circulating downward in the top-bottom direction collides against thesurface 56 a inside theguide portion 56 in the radial direction to be directed upward or outward in the radial direction. - If the
electronic component 71 is mounted to extend in the axial direction and faces theguide portion 56 in the radial direction, it is possible to increase a volume of the air hitting theelectronic component 71 and it is possible to further improve the efficiency of cooling theelectronic component 71. - The
electronic components 71 may include theIC 71 e and theIC 71 e may be mounted to extend in the axial direction. Therefore, it is possible to increase the volume of the air hitting theIC 71 e and it is possible to efficiently cool theIC 71 e at high temperature. - The
air blowing apparatus 200 includes themotor 100 and theimpeller 101 that is provided in therotor 1 and rotates around the center axis C by driving themotor 100, and theimpeller 101 rotates to suck air from the upper side and exhaust the air to the lower side. Therefore, it is possible to easily realize theair blowing apparatus 200 in which the efficiency of cooling theelectronic component 71 of themotor 100 is improved. - A second embodiment of the invention will be described.
FIG. 13 is a side sectional view of adryer 300 in which anair blowing apparatus 200 including amotor 100 of the second embodiment is mounted. Similarly toFIG. 9 , a front side of thedryer 300 in the air blowing direction corresponds to downward in the axial direction of themotor 100. A back side of thedryer 300 in the air blowing direction corresponds to upward in the axial direction of themotor 100. For convenience of explanation, the same reference numerals are given to the same portions as those of the first embodiment illustrated inFIGS. 1 to 12 , which are described above. In the second embodiment, the arrangement of theguide portion 56 is different. The other portions are the same as those of the first embodiment. - The
motor 100 of the second embodiment includes ahousing portion 80 that accommodates abody portion 10 therein. Anair passage 81 is formed at a gap between an inside surface of thehousing portion 80 and thebody portion 10. In a state where themotor 100 is mounted in thedryer 300, theair passage 81 communicates with aninlet port 301 a and anoutlet port 301 b. The airflow (arrow S) circulates in theair passage 81 from the back side to the front side. - The
housing portion 80 is attached to adryer housing 301 in the axial direction and the inside surface of thehousing portion 80 is substantially parallel to the axial direction. - In the embodiment, the
guide portion 56 is provided on the inside surface of thehousing portion 80. Theguide portion 56 is disposed outside in the radial direction and below thebody portion 10. In addition, at least an upper portion of thesurface 56 a inside theguide portion 56 in the radial direction is inclined inward in the radial direction as it extends downward. -
FIG. 14 is a sectional view perpendicular to the axial direction of themotor 100. In the embodiment, four guide portions are disposed side by side at equal intervals in the circumferential direction. Theguide portion 56 has an arc shape the center of which is the center axis C when viewed in the axial direction. A gap G penetrates in the axial direction between theadjacent guide portions 56. The number of theguide portions 56 is not limited to four and may be plural other than four. In addition, theguide portion 56 may have a circular shape the center of which is the center axis C when viewed in the axial direction. - In the
dryer 300 having the configuration described above, when theair blowing apparatus 200 is driven, the airflow generated by the rotation of theimpeller 101 circulates through theair passage 81. Part of the airflow circulating through theair passage 81 is guided inward in the radial direction by theguide portion 56. Thereby, similarly to the first embodiment, it is possible to efficiently cool theelectronic component 71. - The inside surface of the
housing portion 80 except for theguide portion 56 is substantially parallel to the axial direction. Therefore, a space of the inside of thehousing portion 80 can be increased compared to a configuration in which an entire inside surface of thehousing portion 80, instead of theguide portion 56, is inclined inward in the radial direction as the surface extends downward. - According to the embodiment, the
motor 100 includes acylindrical housing portion 80 that accommodates abody portion 10 therein. Thehousing portion 80 forms theair passage 81 through which the airflow (arrow S) circulates in a gap between thehousing portion 80 and thebody portion 10. Theguide portion 56 is provided on the inside surface of thehousing portion 80 and is disposed outside in the radial direction and below thebody portion 10. At least an upper portion of thesurface 56 a inside theguide portion 56 in the radial direction is inclined inwardly in the radial direction as the least an upper portion extends downward. Therefore, similarly to the first embodiment, it is possible to improve the efficiency of cooling theelectronic component 71. - A
bracket 5 attached to a lower portion of thestator 2 is provided and thebracket 5 includes a holdingportion 51 that is disposed at the lower portion of thebody portion 10 and holds thecircuit board 7. The holdingportion 51 includes acylindrical portion 53 that covers at least a part of an outside surface of thebody portion 10 above thecircuit board 7. The guide portion is disposed outside in the radial direction and below the holdingportion 51. Theelectronic component 71 is mounted on the lower surface of thecircuit board 7. Acutout portion 53 a is provided at a lower end of thecylindrical portion 53. Therefore, similarly to the first embodiment, heat can be prevented from being accumulated on the upper surface side of thecircuit board 7 and it is possible to further improve the efficiency of cooling theelectronic component 71. - At least a part of the outer edge portion of the
circuit board 7 protrudes further outside in the radial direction than an outer edge of thecylindrical portion 53 when viewed in the axial direction. Therefore, similarly to the first embodiment, the airflow is also easily circulated on the upper surface side of thecircuit board 7 and it is possible to further improve the efficiency of cooling theelectronic component 71. - The
cutout portion 53 a is disposed at the position same as that of at least a part of theguide portion 56 in the circumferential direction. Therefore, similarly to the first embodiment, it is possible to simultaneously cool the mounting surface side of theelectronic component 71 and a leg side of theelectronic component 71 on thecircuit board 7. - The
motor 100 of the first embodiment and the second embodiment is an outer rotor motor, but it may be an inner rotor motor. - In the first embodiment and the second embodiment, the
electronic component 71 is mounted on the lower surface of thecircuit board 7, but it may be mounted on the upper surface of thecircuit board 7. - In the first embodiment and the second embodiment, the
motor 100 is mounted in thedryer 300, but it may be mounted in an electric machine other than thedryer 300. For example, themotor 100 may be mounted in an electric fan, a ventilating fan, a vacuum cleaner, a hair steamer, or the like. - The invention can be used, for example, for a motor including a circuit board on which an electronic component is mounted and an air blowing apparatus including the same.
- Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises.
- While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Claims (26)
1. A motor comprising:
a body portion that includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction;
a circuit board which is disposed below the body portion and on which an electronic component is mounted; and
a guide portion that guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion, wherein
at least a part of the guide portion faces the electronic component in the radial direction.
2. The motor according to claim 1 , further comprising:
a bracket that is attached to a lower portion of the stator, wherein
the bracket includes
a holding portion that is disposed at a lower portion of the body portion and holds the circuit board,
the guide portion that is disposed outside in the radial direction and below the holding portion, and
a connecting portion that connects the holding portion and the guide portion to each other, and
at least an upper portion of a surface inside the guide portion in the radial direction is inclined inwardly in the radial direction as the upper portion extends downward.
3. The motor according to claim 2 , wherein
the guide portion is disposed outside the circuit board in the radial direction.
4. The motor according to claim 2 , wherein
the guide portion extends in a circumferential direction and a plurality of connecting portions that connect the holding portion and the guide portion to each other are provided in the circumferential direction.
5. The motor according to claim 2 , wherein
the connecting portion extends outside in the radial direction and downward from an outer peripheral end of the holding portion.
6. The motor according to claim 2 , wherein
the holding portion includes a cylindrical portion that covers at least a part of an outside surface of the body portion above the circuit board,
the electronic component is mounted on a lower surface of the circuit board, and
a cutout portion is provided at a lower end of the cylindrical portion.
7. The motor according to claim 6 , wherein
at least a part of an outer edge portion of the circuit board protrudes further outside in the radial direction than an outer edge of the cylindrical portion when viewed in an axial direction.
8. The motor according to claim 6 , wherein
the cutout portion is disposed at a position in a circumferential direction same as a position of at least a part of the guide portion.
9. The motor according to claim 2 , wherein
the bracket includes a locking portion that is locked to an inner wall of a duct through which an airflow circulates, and
the locking portion is positioned further outside than the guide portion in the radial direction.
10. The motor according to claim 2 , wherein
a plurality of guide portions that guide an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion are provided side by side in the circumferential direction.
11. The motor according to claim 10 , wherein
a gap between adjacent guide portions among the plurality of guide portions penetrates in the axial direction.
12. The motor according to claim 2 , wherein
the guide portion has an arc shape the center of which is the center axis when viewed in the axial direction.
13. The motor according to claim 10 , wherein
the electronic component and the guide portion are disposed partially in a predetermined region in the circumferential direction.
14. The motor according to claim 2 , wherein
an inclination angle of at least an upper portion of a surface inside the guide portion in the radial direction is 60 degrees or less with respect to the center axis.
15. The motor according to claim 1 , further comprising:
a housing portion in a cylindrical shape in which the body portion is accommodated and which forms an air passage, through which the airflow circulates, in a gap between the housing portion and the body portion, wherein
the guide portion is provided on an inside surface of the housing portion and is disposed further outside in the radial direction and further below than the body portion, and
at least an upper portion of an inside surface of the guide portion in the radial direction is inclined inwardly in the radial direction as the upper portion extends downward.
16. The motor according to claim 15 , further comprising:
a bracket that is attached to a lower portion of the stator, wherein
the bracket includes a holding portion that is disposed at a lower portion of the body portion and holds the circuit board,
the holding portion includes a cylindrical portion that covers at least a part of an outside surface of the body portion above the circuit board,
the guide portion is disposed outside in the radial direction and below the holding portion,
the electronic component is mounted on a lower surface of the circuit board, and
a cutout portion is provided at a lower end of the cylindrical portion.
17. The motor according to claim 16 , wherein
at least a part of an outer edge portion of the circuit board protrudes further outside in the radial direction than an outer edge of the cylindrical portion when viewed in an axial direction.
18. The motor according to claim 16 , wherein
the cutout portion is disposed at a position in a circumferential direction same as a position of at least a part of the guide portion.
19. The motor according to claim 10 , wherein
a plurality of guide portions that guide an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion are provided side by side in the circumferential direction.
20. The motor according to claim 19 , wherein
a gap between adjacent guide portions among the plurality of guide portions penetrates in the axial direction.
21. The motor according to claim 10 , wherein
the guide portion has an arc shape the center of which is the center axis when viewed in the axial direction.
22. The motor according to claim 19 , wherein
the electronic component and the guide portion are disposed partially in a predetermined region in the circumferential direction.
23. The motor according to claim 10 , wherein
an inclination angle of at least an upper portion of a surface inside the guide portion in the radial direction is 60 degrees or less with respect to the center axis.
24. The motor according to claim 1 , wherein
the electronic component is mounted to extend in the axial direction and faces the guide portion in the radial direction.
25. The motor according to claim 1 , wherein
the electronic component includes an IC, and
the IC is mounted to extend in the axial direction and faces the guide portion in the radial direction.
26. An air blowing apparatus comprising:
the motor according to claim 1 ; and
an impeller that is provided in the rotor and rotates around the center axis by driving the motor, wherein
the impeller rotates to suck air from an upper side and exhaust the air to a lower side.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-009012 | 2017-01-20 | ||
JP2017009012A JP2018117505A (en) | 2017-01-20 | 2017-01-20 | Motor and blower including the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20180209429A1 true US20180209429A1 (en) | 2018-07-26 |
Family
ID=60997385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/867,839 Abandoned US20180209429A1 (en) | 2017-01-20 | 2018-01-11 | Motor and air blowing apparatus including the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US20180209429A1 (en) |
EP (1) | EP3351803A1 (en) |
JP (1) | JP2018117505A (en) |
CN (1) | CN108336867A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11873824B2 (en) | 2021-02-05 | 2024-01-16 | Techtronic Cordless Gp | Blower |
US11889794B2 (en) | 2020-12-30 | 2024-02-06 | Milwaukee Electric Tool Corporation | Handheld blower |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3089716B1 (en) * | 2018-12-05 | 2021-05-28 | Safran Electrical & Power | Compact smart electric motor |
JP7354569B2 (en) * | 2019-03-28 | 2023-10-03 | ニデック株式会社 | Air blower and vacuum cleaner |
CN112081762B (en) * | 2019-06-13 | 2023-01-31 | 苏州凯航电机有限公司 | Electric fan and cleaning equipment |
JP7001941B2 (en) * | 2020-06-10 | 2022-01-20 | ダイキン工業株式会社 | Electric motor |
JP7406137B1 (en) | 2022-07-21 | 2023-12-27 | ダイキン工業株式会社 | Motor, blower, and refrigeration cycle equipment |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5198807U (en) * | 1975-02-06 | 1976-08-07 | ||
FR2764747B1 (en) * | 1997-06-16 | 1999-09-03 | Valeo Systemes Dessuyage | MOTOR FAN FOR MOTOR VEHICLE WITH COOLING PLATE COOLING |
JP2006177309A (en) | 2004-12-24 | 2006-07-06 | Kiko Kagi Kofun Yugenkoshi | Heat radiation structure of fan |
JP4292417B2 (en) * | 2005-01-28 | 2009-07-08 | 日本電産サーボ株式会社 | Centrifugal fan impeller |
GB2468299B (en) * | 2009-03-03 | 2012-06-20 | Dyson Technology Ltd | Noise reduction arrangement for a cleaning appliance. |
CN104859426B (en) * | 2014-02-24 | 2019-02-05 | 德昌电机(深圳)有限公司 | A kind of ventilation equipment assembly |
CN205231883U (en) * | 2015-11-12 | 2016-05-11 | 黎氏电业(香港)有限公司 | Motor support suitable for hairdryer |
-
2017
- 2017-01-20 JP JP2017009012A patent/JP2018117505A/en not_active Withdrawn
-
2018
- 2018-01-05 CN CN201810010019.2A patent/CN108336867A/en active Pending
- 2018-01-11 US US15/867,839 patent/US20180209429A1/en not_active Abandoned
- 2018-01-16 EP EP18151938.0A patent/EP3351803A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11889794B2 (en) | 2020-12-30 | 2024-02-06 | Milwaukee Electric Tool Corporation | Handheld blower |
US11873824B2 (en) | 2021-02-05 | 2024-01-16 | Techtronic Cordless Gp | Blower |
Also Published As
Publication number | Publication date |
---|---|
CN108336867A (en) | 2018-07-27 |
JP2018117505A (en) | 2018-07-26 |
EP3351803A1 (en) | 2018-07-25 |
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