WO2021171832A1 - Moteur cc sans balais - Google Patents

Moteur cc sans balais Download PDF

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Publication number
WO2021171832A1
WO2021171832A1 PCT/JP2021/001570 JP2021001570W WO2021171832A1 WO 2021171832 A1 WO2021171832 A1 WO 2021171832A1 JP 2021001570 W JP2021001570 W JP 2021001570W WO 2021171832 A1 WO2021171832 A1 WO 2021171832A1
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WO
WIPO (PCT)
Prior art keywords
stator core
brushless
circuit board
holding portion
motor
Prior art date
Application number
PCT/JP2021/001570
Other languages
English (en)
Japanese (ja)
Inventor
謙一 岩田
本弘 森下
松本　敏宏
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2020177824A external-priority patent/JP7050237B2/ja
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2021171832A1 publication Critical patent/WO2021171832A1/fr

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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
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • This disclosure relates to a brushless DC motor provided in a ceiling fan.
  • Patent Document 1 describes a ceiling fan in which a fan for blowing air is provided at the tip of a tubular housing extending downward from the ceiling.
  • This ceiling fan includes a brushless DC motor for rotating the blades.
  • the brushless DC motor has a motor main body including a stator and a rotor, and a drive circuit for driving the motor main body.
  • the drive circuit is arranged above the motor body in the housing.
  • a ceiling fan equipped with a brushless DC motor it is desirable that the height of the blades from the floor surface be set at a high position from the viewpoint of distributing the air flow over a wide range. Therefore, when the ceiling height is fixed, it is advantageous that the housing of the ceiling fan is short in the vertical direction. In order to shorten the housing vertically, it is necessary to reduce the thickness of the brushless DC motor that combines the motor body and the drive circuit.
  • the present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide a brushless DC motor capable of making a ceiling fan thinner.
  • the brushless DC motor is a brushless DC motor provided in a ceiling fan, and is fixed to a stator having a stator core around which a coil is wound and a central portion of the stator core.
  • a secondary that converts the voltage supplied from the primary power supply circuit and the primary power supply circuit between the shaft, the bearing, the rotor having a magnet that surrounds the stator core, and the stator core and the bearing in the axial direction.
  • a circuit board having a side power supply circuit and a motor drive circuit that supplies a drive current to the coil based on the power supplied from the secondary side power supply circuit is provided.
  • FIG. 1 is a perspective view showing a ceiling fan provided with a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view showing the peripheral structure of the motor of FIG.
  • FIG. 3 is an exploded perspective view of the motor of FIG.
  • FIG. 4 is a side view showing the stator of the motor of FIG.
  • FIG. 5 is a bottom view showing the circuit board of the motor of FIG.
  • FIG. 6 is a block diagram showing the configuration of the circuit board of the motor of FIG.
  • FIG. 7 is a perspective view of the substrate holding portion of the motor of FIG. 1 as viewed from the stator core side.
  • FIG. 8 is a cross-sectional view taken along the line AA in FIG. 4 showing the relationship between the substrate holding portion and the stator core.
  • FIG. 1 is a perspective view showing a ceiling fan provided with a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view showing the peripheral structure of the motor of FIG.
  • FIG. 3 is an exploded perspective view
  • FIG. 9 is an enlarged view of a portion B in FIG. 8 showing a positioning protrusion of the substrate holding portion and an opening of the stator core.
  • FIG. 10 is a perspective view of the substrate holding portion as viewed from the circuit board side.
  • FIG. 11 is an exploded perspective view showing the relationship between the heat dissipation portion of the stator and the circuit board.
  • FIG. 12A is a plan view showing a state in which the lead wire is held by the stator.
  • FIG. 12B is a cross-sectional view taken along the line CC in FIG. 12A showing a state in which the lead wire is held by the stator.
  • FIG. 13 is a cross-sectional view taken along the line DD in FIG. 12A, showing a state in which the substrate holding portion and the circuit board sandwich the heat radiating portion.
  • FIG. 1 is a perspective view showing a ceiling fan 1.
  • the ceiling fan 1 is attached to the ceiling 4 and functions as a fan having a plurality of blades 2 that generate an air flow by rotating.
  • the ceiling fan 1 includes a motor 10 that rotates a plurality of blades 2 and a housing 5 that extends downward from the ceiling 4 and surrounds the motor 10.
  • the ceiling fan 1 is provided with a lighting unit 3 having a light emitting element such as an LED at the lower end thereof.
  • the housing 5 has a substantially conical first portion 5a whose diameter gradually decreases downward from the ceiling side, and a substantially conical second portion whose diameter gradually increases downward from the lower portion of the first portion 5a. Has 5b and.
  • the connecting portion 5c of the first portion 5a and the second portion 5b is narrowed down more than the first portion 5a and the second portion 5b.
  • the lower part of the second portion 5b exhibits a cylindrical shape having a constant diameter.
  • the second portion 5b functions as an outer shell that houses the motor 10.
  • FIG. 2 is a cross-sectional view showing the peripheral structure of the motor 10 of the ceiling fan 1.
  • FIG. 3 is an exploded perspective view of the motor 10.
  • FIG. 4 is a side view showing the stator 20.
  • the motor 10 mainly includes a stator 20, a shaft 30, a rotor 40, a first bearing 32, a second bearing 34, a circuit board 48, a blade holder 70, and a rotation detection unit 400.
  • axial direction the direction along the central axis La of the shaft 30
  • the circumferential direction and radial direction of the circle centered on the central axis La are referred to as "circumferential direction” and "diameter direction”, respectively.
  • one side (upper side in the figure) in the axial direction is referred to as “upper” and “upper”, and the other side (lower side in the figure) is referred to as “lower” and “lower”.
  • the notation in such a direction does not limit the posture in which the motor 10 is used, and the motor 10 can be used in any posture.
  • the stator 20, the shaft 30, the circuit board 48, and the rotation detection unit 400 form a stationary body, and the rotor 40, the blade holder 70, and the plurality of blades 2 form a rotating body.
  • the circuit board 48 supplies a drive current to the stator 20 based on the detection signal of the rotation detection unit 400.
  • the stator 20 generates a rotating magnetic field according to the driving current.
  • the rotor 40 rotates around the central axis La according to the rotating magnetic field.
  • the blade holder 70 rotates a plurality of blades 2 by rotating integrally with the rotor 40.
  • the plurality of blades 2 generate a downward air flow by rotating.
  • the first bearing 32, the rotor 40 and the stator 20, the circuit board 48, and the second bearing 34 are arranged in this order from top to bottom, and surround the shaft 30.
  • the rotor 40 is arranged so as to face the stator 20 in the radial direction.
  • the rotor 40 and the stator 20 have a larger diameter than the first bearing 32, and the circuit board 48 has a larger diameter than the rotor 40 and the stator 20.
  • the shaft 30 is a pipe-shaped member having a hollow portion in the center for passing a wire for wiring.
  • the hollow portion of the shaft 30 penetrates vertically, and a horizontal hole 30h for passing a wire is provided on the side surface of the shaft 30.
  • the stator 20 has a stator core 22 around which a coil 24 is wound.
  • the coil 24 constitutes a three-phase armature coil.
  • the shaft 30 is fixed to the central portion of the stator core 22.
  • the rotor 40 has a magnet 42 that surrounds the stator core 22, and is fixed to the outer ring of the first bearing 32.
  • the stator core 22 has a plurality of (for example, 12) teeth portions 22t and a plurality of slots 22s provided between the plurality of teeth portions 22t.
  • the side surface of each slot 22s leads to the opening 22k of the stator core 22.
  • An insulating sheet 23 made of a resin film is inserted into each slot 22s.
  • the insulating sheet 23 includes a slot insulator 23b that covers the inner side surface (the surface on the slot 22s side) of the teeth portion 22t, and a slot key 23c provided on the outer peripheral side of the slot 22s.
  • the insulating sheet 23 of this example protrudes in the axial direction from the end surface of the tooth portion 22t.
  • Insulating members 200 are provided on the upper surface and the lower surface of the stator core 22, respectively.
  • the insulating member 200 functions as a core cover that covers a part of each tooth portion 22t.
  • the insulating member 200 is a resin member formed by molding.
  • the coil 24 includes a plurality of (for example, 12) coil main body portions 24a wound around each tooth portion 22t.
  • the plurality of coil main bodies 24a are connected in series for each phase.
  • the terminal of the coil body 24a of each phase is connected to a motor drive circuit described later.
  • the rotor 40 has a rotor yoke 44.
  • the rotor yoke 44 includes a hollow disk-shaped top plate portion 44a, a cylindrical magnet support portion 44b extending downward from the outer peripheral portion of the top plate portion 44a, and a donut extending radially outward from the lower portion of the magnet support portion 44b. It has a shaped extending portion 44c.
  • the central portion of the top plate portion 44a is fixed to the outer ring of the first bearing 32.
  • the magnet 42 is fixed to the inner peripheral surface of the magnet support portion 44b.
  • the outer peripheral portion of the extending portion 44c is fixed to the blade holder 70 by the male screw S1.
  • the magnet 42 has a plurality of (for example, 10) magnetic poles that supply field magnetic flux to the stator core 22.
  • the magnet 42 is divided into a plurality of segments. As shown in FIG. 4, the upper end and the lower end of the magnet 42 extend vertically by a predetermined dimension (for example, 5 mm) of the stator core 22.
  • the rotor 40 has a magnet holder 300 that holds the magnet 42 in a predetermined position.
  • the magnet holders 300 are arranged above and below the magnet 42 to limit the axial position of the magnet 42.
  • the magnet holder 300 includes a first holder 310 arranged below the magnet 42 and a second holder 320 arranged above the magnet 42.
  • the outer peripheral portion of the first holder 310 is locked to the rotor yoke 44, which limits the downward movement of the magnet 42.
  • the second holder 320 limits the upward movement of the magnet 42.
  • the first holder 310 and the second holder 320 are substantially ring-shaped resin members that can be elastically deformed.
  • the first bearing 32 and the second bearing 34 are rolling bearings having a rolling element 33 such as a ball.
  • the inner rings of the first bearing 32 and the second bearing 34 are fixed to the shaft 30 via the E washers 32c and 34c.
  • the first bearing 32 and the second bearing 34 are arranged vertically separated from each other with the stator core 22 and the circuit board 48 interposed therebetween.
  • the first bearing 32 is arranged above the stator core 22.
  • the second bearing 34 is arranged below the circuit board 48 on the opposite side of the stator core 22 from the first bearing 32.
  • FIG. 5 is a bottom view showing the circuit board 48.
  • FIG. 6 is a block diagram showing the configuration of the circuit board 48.
  • the circuit board 48 includes a wiring board 50, a primary power supply circuit 51, a secondary power supply circuit 52, and a motor drive circuit 53.
  • the primary side power supply circuit 51, the secondary side power supply circuit 52, and the motor drive circuit 53 are provided on the wiring board 50.
  • the wiring board 50 is a printed wiring board (Printed Circuit Board).
  • the primary power supply circuit 51 rectifies the input AC voltage (for example, 220V to 240V) and supplies the first DC voltage V1 (for example, 310V to 340V).
  • the secondary power supply circuit 52 supplies a 15V second DC voltage V2 and a 5V third DC voltage V3 by the DC-DC converters 52a and 52b based on the first DC voltage.
  • the motor drive circuit 53 includes a microprocessor 53a, a control unit 53b, and a switching unit 53c, and supplies a drive current to the coil 24.
  • the first DC voltage V1 is mainly supplied to the switching unit 53c.
  • the second DC voltage V2 is mainly supplied to the control unit 53b.
  • the third DC voltage V3 is mainly supplied to the microprocessor 53a.
  • the control unit 53b generates an FG signal based on the position signals Hs acquired from the Hall elements HE1, HE2, and HE3 of the rotation detection unit 400, and outputs the FG signal to the microprocessor 53a.
  • the microprocessor 53a generates a rotation control signal Cs that controls the rotation of the motor 10 based on the FG signal output from the control unit 53b, and outputs the rotation control signal Cs to the control unit 53b.
  • the control unit 53b generates a phase switching signal Qs for energizing phase switching based on the position signal Hs acquired from the Hall element of the rotation detection unit 400.
  • the control unit 53b generates a PWM signal Ps based on the rotation control signal Cs and the phase switching signal Qs output from the microprocessor 53a and outputs the PWM signal Ps to the switching unit 53c.
  • the switching unit 53c includes a switching element (not shown) that constitutes a three-phase bridge.
  • the switching unit 53c controls the continuity / non-passage of the switching element based on the PWM signal Ps output from the control unit 53b, and causes a drive current to flow through the coil 24.
  • the control unit 53b and the switching unit 53c form a three-phase inverter.
  • the switching unit 53c of this embodiment is realized by a one-chip motor drive IC.
  • the circuit board 48 of this embodiment communicates with the sub-wiring board 49, the lighting drive circuit 55 for driving the lighting unit 3, and a remote controller (not shown) for remotely controlling the ceiling fan 1. It further includes a communication circuit 56.
  • the illumination drive circuit 55 is provided on the sub-wiring board 49, and the communication circuit 56 is provided on the wiring board 50.
  • the sub wiring board 49 is a printed wiring board.
  • the circuit board 48 has a ring shape surrounding the shaft 30, and is provided between the stator core 22 and the second bearing 34 in the axial direction.
  • the circuit board 48 is supported by the stator core 22 by fixing the wiring board 50 to the stator core 22 via the substrate holding portion 100.
  • the substrate holding portion 100 is located between the stator core 22 and the circuit board 48, and has substantially the same shape as the axial end portion of the stator core 22 in the axial view.
  • the sub-wiring board 49 is fixed to the lower surface of the wiring board 50 via the board holder 60.
  • the wiring board 50 is a ring-shaped circular member having a central hole 50h
  • the sub-wiring board 49 is a partial member in the ring shape.
  • a wiring connection component 58 such as a connector for connecting wiring is mounted on the lower surface 50j of the wiring board 50 on the side opposite to the stator core 22.
  • the wiring connection component 58 in this example is a male connector.
  • the female connector in which the lead wire is connected to the wiring connection component 58 can be easily attached / detached while the circuit board 48 is fixed to the stator core 22 via the substrate holding portion 100. Assembly workability and maintainability are improved. Further, since the wiring board 50 can be brought close to the stator core 22, it is advantageous for thinning.
  • the electronic component 51p constituting the primary power supply circuit 51 is mounted on the lower surface 50j of the wiring board 50 opposite to the stator core 22. As a result, the heat generated in the electronic component 51p is blocked by the wiring board 50, so that heat conduction to the stator 20 and the rotor 40 is reduced, the temperature rise of the coil 24 is suppressed, and quality deterioration can be prevented.
  • a heat radiating section 46 that dissipates heat from the motor drive circuit 53 is provided between the board holding section 100 and the wiring board 50.
  • the heat radiating unit 46 promotes heat radiating from the motor drive IC (switching unit 53c) of the motor drive circuit 53 and suppresses the temperature rise.
  • the rotation detection unit 400 includes Hall elements HE1, HE2, HE3 for detecting the magnetic flux of the magnet 42, and an HE holder 410.
  • the Hall elements HE1, HE2, and HE3 are arranged at positions deviated by 120 degrees in the electrical angle in the circumferential direction.
  • the Hall element HE2 is arranged at a predetermined opening 22k (hereinafter referred to as an opening 22k (H)) in the circumferential direction.
  • the input / output terminals of the Hall elements HE1, HE2, and HE3 are connected to the circuit board 48.
  • the output signals of the Hall elements HE1, HE2, and HE3 are input to the control unit 53b.
  • the HE holder 410 is a member that supports the Hall elements HE1, HE2, and HE3, is held by the substrate holding portion 100, and is sandwiched and fixed between the wiring board 50 and the stator core 22.
  • the HE holder 410 has a convex portion 420 that projects upward and engages the opening 22k (H).
  • the blade holder 70 rotates integrally with the rotor 40, and transmits the rotation of the rotor 40 to a plurality of (for example, five) blades 2.
  • the blade holder 70 is a hollow circular member, and extends inward in the radial direction from the holder cylindrical portion 70a, the trumpet-shaped portion 70b extending downward from the lower portion of the holder cylindrical portion 70a, and the lower portion of the holder cylindrical portion 70a. It has a hollow disk-shaped holder disk portion 70c extending and a holder flange portion 70d extending radially outward from the lower portion of the trumpet-shaped portion 70b.
  • the upper portion of the holder cylindrical portion 70a is fixed to the extending portion 44c of the rotor yoke 44.
  • the holder cylindrical portion 70a surrounds the circuit board 48 with a gap.
  • the outer ring of the second bearing 34 is fixed to the central portion of the holder disk portion 70c.
  • a plurality of blades 2 are fixed to the holder flange portion 70d.
  • the plurality of blades 2 are arranged at predetermined intervals in the circumferential direction, and extend outward in the radial direction from the holder flange portion 70d.
  • the lower portion of the trumpet-shaped portion 70b surrounds the upper portion of the illumination portion 3 with a gap.
  • the upper portion of the illumination unit 3 is fixed to the lower portion of the shaft 30.
  • FIG. 7 is a perspective view of the substrate holding portion 100 as viewed from the stator core 22 side.
  • FIG. 8 is a cross-sectional view taken along the line AA in FIG. 4 showing the relationship between the substrate holding portion 100 and the stator core 22.
  • the substrate holding portion 100 is a resin-made substantially disk-shaped member, which is provided between the stator core 22 and the circuit board 48 and holds the circuit board 48.
  • a hollow cylindrical cylindrical portion 120 extending vertically is provided at the central portion of the substrate holding portion 100.
  • the cylindrical portion 120 circumscribes the outer peripheral surface of the shaft 30.
  • the contact area with the shaft 30 increases, and the substrate holding portion 100 and the wiring board 50 can be held on a surface orthogonal to the shaft 30.
  • the components of the primary power supply circuit 51 and the motor drive circuit 53 can be stably held.
  • the cylindrical portion 120 is provided with two slits 122 notched with a width of approximately 30 ° at intervals of 180 ° in the circumferential direction.
  • a plurality of positioning protrusions 110 are provided on the surface 102 of the substrate holding portion 100 facing the stator core 22.
  • the positioning projection 110 extends upward from the outer peripheral portion of the substrate holding portion 100.
  • the four positioning protrusions 110 are arranged at 90 ° intervals in the circumferential direction.
  • a seat portion 112 with which the stator core 22 abuts is provided at the base of each positioning protrusion 110.
  • Each positioning protrusion 110 vertically engages with an opening 22k provided on the side surface of the stator core 22.
  • the positioning projection 110 is provided at least at a position near the Hall elements HE1, HE2, and HE3 and a position opposite to the peripheral position in the circumferential direction (position separated by 180 ° in the circumferential direction). ..
  • the positional relationship between the wiring board 50 and the Hall elements HE1, HE2, and HE3 is stabilized.
  • the mold for manufacturing the substrate holding portion 100 can be simplified, and the amount of resin can be reduced.
  • the position near the Hall elements HE1, HE2, and HE3 is the position of the opening 22k (A) adjacent to the opening 22k (H) corresponding to the Hall element HE2.
  • a plurality of (for example, 12) radial ribs 130 are provided on the surface 102 of the substrate holding portion 100 facing the stator core 22.
  • the radial rib 130 extends radially outward from the outer circumference of the cylindrical portion 120.
  • twelve radial ribs 130 are arranged at 30 ° intervals in the circumferential direction.
  • the radial rib 130 is located at the center of each slot 22s in the circumferential direction so as to avoid the coil 24 in a plan view.
  • the position for avoiding the coil 24 is an intermediate position between the adjacent coils 24 in a plan view, and is a position corresponding to the space provided between the adjacent coils 24.
  • interference between the radial rib 130 and the coil 24 can be avoided, which is advantageous for reducing the thickness of the substrate holding portion 100.
  • a hollow annular peripheral rib 140 is provided on the outer peripheral side of the surface 102 of the substrate holding portion 100 facing the stator core 22 so that the outer peripheral diameter of the stator core 22 and the outer peripheral diameter are substantially the same. As a result, the strength of the outer peripheral side of the substrate holding portion 100 can be improved. Further, it is possible to suppress the floating of the positioning protrusion 110 due to the deformation of the substrate holding portion 100.
  • the circumferential rib 140 extends in a circumferential shape to connect the positioning protrusions 110.
  • FIG. 9 is an enlarged view of part B in FIG. 8 showing the opening 22k of the positioning protrusion 110 and the stator core 22.
  • the positioning protrusion 110 has a tapered shape along the inner wall surface 22m of the opening 22k in a plan view.
  • the wall surface 22m is a circumferential end surface of the teeth portion 22t, and is a wall surface extending inward in the radial direction from the outer peripheral side of the opening 22k of the teeth portion 22t. That is, the wall surface 22m is a wall surface extending inward in the radial direction from the opening 22k of the stator core 22.
  • FIG. 10 is a perspective view of the substrate holding portion 100 as viewed from the circuit board 48 side.
  • FIG. 11 is an exploded perspective view showing the relationship between the heat radiating portion 46 of the stator 20 and the circuit board 48.
  • FIG. 12A is a plan view showing a state in which the lead wire 154 is held by the stator 20.
  • FIG. 12B is a cross-sectional view taken along the line CC in FIG. 12A showing a state in which the lead wire 154 is held by the stator 20.
  • FIG. 13 is a cross-sectional view taken along the line DD in FIG.
  • FIGS. 10 to 13 showing a state in which the substrate holding portion 100 and the circuit board 48 sandwich the heat radiating portion 46.
  • the floor surface (lower side) is shown as the upper side (upper side) of the drawing.
  • a plurality of support columns 151 for holding the circuit board 48 are provided on the surface 150 of the substrate holding portion 100 opposite to the stator core 22.
  • the strut portion 151 extends upward from the outer peripheral portion of the substrate holding portion 100.
  • the four strut portions 151 are arranged at intervals of 90 ° in the circumferential direction.
  • the strut portion 151 holds the heat radiating portion 46 and the circuit board 48.
  • the strut portion 151 includes two arrangement surfaces 151a and 151b that share a central axis and have different radial lengths and axial heights from the central axis.
  • a lead wire holding portion 155 for holding a plurality of lead wires 154 connected on the circuit board 48 through the hollow space of the shaft 30 is provided.
  • the heat radiating portion 46 includes a thin plate-shaped heat sink 46h, an insulating film 46f, and a heat radiating gel sheet 46g made of silicon having high thermal conductivity.
  • the motor drive IC switching unit 53c of the motor drive circuit 53 mounted on the wiring board 50 of the circuit board 48 is thermally connected to the heat sink 46h via the heat dissipation gel sheet 46g.
  • the end portion of the lead wire holding portion 155 opposite to the stator core 22 penetrates the notched inner peripheral side space 50k of the circuit board 48 and 1 in the circuit board 48. It extends to the arrangement surface 50j of the next power supply circuit 51.
  • the lead wire 154 is not held by the circuit board 48, but is held by the lead wire holding portion 155 of the penetrating board holding portion 100, so that the lead wire 154 is held by the circuit board 48. It can be easily wired. Therefore, assembly workability and maintainability are improved. Further, since the wiring board 50 can be brought close to the stator core 22, the thickness can be reduced.
  • the heat radiating portion 46 is arranged on one of the arrangement surfaces 151a of the support column 151, and the circuit board 48 is arranged on the other arrangement surface 151b.
  • the arrangement surface 151a is the same as the surface 150, but it may be arranged between the surface 150 and the arrangement surface 151b.
  • the strut portion 151 has a substantially cylindrical shape having a hole for fastening the circuit board 48 with the male screw S2 from above.
  • the outer diameter of the arrangement surface 151a of the support column 151 is larger than the outer diameter of the arrangement surface 151b.
  • the heat radiating unit 46 By having the heat radiating unit 46, heat radiating is promoted and the temperature rise of the motor drive IC is suppressed. Further, with this configuration, the heat sink 46h can be arranged in a narrow space, which is advantageous for thinning. Since the temperature rise of the motor drive IC is suppressed, the output of the motor 10 can be increased accordingly to increase the air volume of the ceiling fan 1.
  • the motor 10 can be easily made thinner.
  • the blades 2 of the ceiling fan 1 can be arranged at a higher position according to the thickness of the motor 10.
  • the downward air flow can be expanded over a wide range, so that the unevenness of the air volume near the floor can be reduced and the comfort can be improved.
  • interference with humans can be avoided.
  • the connection portion 5c of the housing 5 can be made thinner, so that the air flow guided to the blades 2 becomes smooth at this portion, which is advantageous in reducing power consumption.
  • the brushless DC motor (10) of a certain aspect of the present disclosure is a brushless DC motor provided in the ceiling fan (1), and includes a stator (20) having a stator core (22) around which a coil (24) is wound, and a stator core.
  • the primary side power supply circuit (51) the secondary side power supply circuit (52) that converts the voltage supplied from the primary side power supply circuit (51), and the secondary side power supply circuit.
  • It includes a circuit board (48) having a motor drive circuit (53) that supplies a drive current to the coil (24) based on the power supplied from (52).
  • the brushless DC motor (10) further includes a substrate holding portion (100) for holding the circuit board (48) on the stator core (22), and the substrate holding portion (100) includes the stator core (22) and the circuit board (48). It may be located between the above and have substantially the same shape as the axial end portion of the stator core (22) in the axial view.
  • the substrate holding portion (100) may have a cylindrical portion (120) circumscribing the outer peripheral surface of the shaft (30).
  • a heat radiating section (46) that dissipates heat from the motor drive circuit (53) may be provided between the board holding section (100) and the circuit board (48).
  • a support column (151) for holding the circuit board (48) is provided on the surface (150) of the substrate holding portion (100) opposite to the stator core (22), and the support column (151) is a heat dissipation unit (46). And the circuit board (48) may be held.
  • the strut portion (151) includes two arrangement surfaces (151a) and an arrangement surface (151b) that share a central axis and have different radial lengths and axial heights from the central axis, and one of them.
  • the heat radiating portion (46) may be arranged on the arrangement surface (151a), and the circuit board (48) may be arranged on the other arrangement surface (151b).
  • a wiring connection component (58) for connecting wiring may be provided on the surface (50j) of the circuit board (48) opposite to the stator core (22).
  • An electronic component (51p) constituting the primary power supply circuit (51) may be provided on the surface (50j) of the circuit board (48) opposite to the stator core (22).
  • the lead wire holding portion (155) for holding is provided, and the end portion of the lead wire holding portion (155) opposite to the stator core (22) penetrates the inner peripheral side space (50k) of the circuit board (48). It may be extended to the arrangement surface (50j) of the primary power supply circuit (51) on the circuit board (48).
  • the substrate holding portion (100) may have a positioning projection (110) that engages with the opening (22k) of the stator core (22).
  • the positioning protrusion (110) may be provided at a position near the Hall element (HE1, HE2, HE3) that detects the magnetic flux of the magnet (42) and a position opposite to the circumferential direction of the position.
  • the positioning protrusion (110) may have a shape along the wall surface (22 m) of the opening (22 k).
  • the radial rib (130) may be provided at a position avoiding the coil (24) on the surface (102) of the substrate holding portion (100) facing the stator core (22).
  • a circumferential rib (140) may be provided on the outer peripheral side of the surface (102) of the substrate holding portion (100) facing the stator core (22).

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Brushless Motors (AREA)

Abstract

La présente invention concerne un moteur à courant continu sans balais qui est disposé dans un ventilateur de plafond et comporte : un stator (20) ayant un noyau de stator (22) autour duquel une bobine (24) est enroulée; un arbre (30) fixé à la partie centrale du noyau de stator (22); un palier (34); un rotor (40) ayant des aimants (42) entourant le noyau de stator (22); et une carte de circuit imprimé ayant un circuit d'alimentation électrique côté primaire (51), un circuit d'alimentation électrique côté secondaire (52), et un circuit d'entraînement de moteur (53) entre le noyau de stator (22) et le palier (34) dans la direction axiale, ledit circuit d'alimentation électrique côté secondaire (52) convertissant la tension fournie par le circuit d'alimentation électrique côté primaire (51), ledit circuit d'entraînement de moteur (53) fournissant un courant d'entrainement à la bobine (24) sur la base de la puissance fournie par le circuit d'alimentation électrique côté secondaire (52).
PCT/JP2021/001570 2020-02-26 2021-01-19 Moteur cc sans balais WO2021171832A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2020030556 2020-02-26
JP2020-030556 2020-02-26
JP2020-177824 2020-10-23
JP2020177824A JP7050237B2 (ja) 2020-02-26 2020-10-23 ブラシレスｄｃモータ

Publications (1)

Publication Number Publication Date
WO2021171832A1 true WO2021171832A1 (fr) 2021-09-02

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PCT/JP2021/001570 WO2021171832A1 (fr) 2020-02-26 2021-01-19 Moteur cc sans balais

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WO (1) WO2021171832A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013247790A (ja) * 2012-05-28 2013-12-09 Panasonic Corp ブラシレスモータ
WO2018235687A1 (fr) * 2017-06-19 2018-12-27 パナソニックＩｐマネジメント株式会社 Moteur cc sans balais et ventilateur de plafond faisant appel audit moteur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013247790A (ja) * 2012-05-28 2013-12-09 Panasonic Corp ブラシレスモータ
WO2018235687A1 (fr) * 2017-06-19 2018-12-27 パナソニックＩｐマネジメント株式会社 Moteur cc sans balais et ventilateur de plafond faisant appel audit moteur

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