JP7065268B2 - Brushless DC motor - Google Patents

Description

The present disclosure relates to a brushless DC motor provided in a ceiling fan.

Brushless DC motors with a stator are known. For example, Patent Document 1 describes a stator of an electric motor. The stator is provided on a stator core covered with a covering member made of an insulating resin, a coil wound around the stator core from above the covering member, and one end face in the axial direction of the covering member. It is equipped with a crossover wire storage section that extends in the circumferential direction in which the wire is stored. This covering member is provided with a crossover introduction notch portion for introducing the coil crossover wire from the coil to the crossover wire accommodating portion.

Japanese Patent Application Laid-Open No. 2003-204645

In 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 vertical length of the housing, it is necessary to reduce the thickness of the brushless DC motor built in the housing.

It is conceivable to reduce the height of the resin provided on the stator core in order to reduce the thickness of the motor. However, in the stator described in Patent Document 1, since three or more crossover lines are stored in parallel with the crossover wire storage portion, the side wall of the crossover wire storage portion needs to have a height of a predetermined value or more, and the motor It is disadvantageous for thinning.

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 reducing the thickness of a ceiling fan.

The brushless DC motor according to a certain aspect of the present disclosure is a brushless DC motor provided in a ceiling fan, and has a stator core formed by connecting a plurality of radially extending teeth portions in an annular shape and a coil wound around the stator core. It includes a stator having a main body, a shaft fixed to the center of the stator core, and a rotor having a magnet surrounding the stator core. The insulating member is provided with an insulating member for ensuring the insulation of the coil body, and the insulating member is provided with a disk plane located on the inner peripheral side of the coil body portion and on the stator core side of the axial end portion of the coil body portion. It is wired along the inner circumference side of the coil body, and intersects with different crossovers only at points on the inner circumference side of the coil body on the disk plane from the viewpoint from the axial direction of the shaft. Solves the above-mentioned problems by providing a separation portion for separating the crossovers from each other in the axial direction at positions where they intersect at points.

It should be noted that the expression of the present disclosure converted between methods, devices, systems, recording media, computer programs and the like is also effective as an aspect of the present disclosure.

According to the present disclosure, it is possible to provide a brushless DC motor capable of reducing the thickness of a ceiling fan.

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. 7 is a perspective view and a wiring diagram showing the stator assembly of the motor of FIG. 1. FIG. FIG. 8 is a plan view showing the stator assembly of the motor of FIG. FIG. 9 is an enlarged view showing a disk plane of the stator assembly of the motor of FIG. 1.

Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings. In the embodiments and modifications, the same or equivalent components and members are designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. Further, the dimensions of the members in each drawing are shown in an appropriately enlarged or reduced size for easy understanding. In addition, some of the members that are not important for explaining the embodiment in each drawing are omitted and displayed.

Also, terms including ordinal numbers such as 1st and 2nd are used to describe various components, but this term is used only for the purpose of distinguishing one component from other components, and this term is used. The components are not limited by.

The motor 10 according to the embodiment of the present disclosure is a brushless DC motor provided in the ceiling fan 1. First, the overall configuration of the ceiling fan 1 will be described. 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 for rotating a plurality of blades 2 and a housing 5 extending downward from the ceiling 4 and surrounding 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.

2 to 4 will be referred to. 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. Hereinafter, the direction along the central axis La of the shaft 30 is referred to as "axial direction", and the circumferential direction and the radial direction of the circle centered on the central axis La are referred to as "circumferential direction" and "diametrical direction", respectively. Further, hereinafter, for convenience, 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.

First, the operation of the motor 10 and the ceiling fan 1 will be described. In the ceiling fan 1, 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 rotate to generate a downward air flow. Hereinafter, each part will be described in detail.

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 up and down, 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 the 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 main body portion 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 an extension portion 44c in the shape of an extension. 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 up and down by a predetermined dimension (for example, 5 mm) of the stator core 22.

As shown in FIG. 3, the rotor 40 has a magnet holder 300 that holds the magnet 42 in a predetermined position. The magnet holder 300 is 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 on the lower side of the magnet 42 and a second holder 320 arranged on the upper side of 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.

As shown in FIG. 2, 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 apart 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.

5 and 6 are also referred to. 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 second DC voltage V2 of 15 V and a third DC voltage V3 of 5 V 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 for controlling 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 output from the microprocessor 53a and the phase switching signal Qs, and outputs the PWM signal Ps to the switching unit 53c.

The switching unit 53c includes a switching element (not shown) constituting the 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.

As shown in FIG. 5, the circuit board 48 of this embodiment communicates with a sub-wiring board 49, a lighting drive circuit 55 for driving the lighting unit 3, and a remote controller (not shown) for remotely controlling the ceiling fan 1. 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.

As shown in FIG. 4, 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 board holding portion 100. The sub-wiring board 49 is fixed to the lower surface of the wiring board 50 via the board holder 60. As shown in FIG. 5, the wiring board 50 is a ring-shaped circular member having a central hole 50h, and the sub-wiring board 49 is a partial member in the ring shape.

As shown in FIG. 5, 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. As a result, at the time of assembling the motor 10, the female connector to 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.

As shown in FIG. 4, 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.

As shown in FIG. 3, 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 dissipation from the motor drive IC (switching unit 53c) of the motor drive circuit 53 and suppresses the temperature rise.

As shown in FIG. 4, 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 position of 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).

As shown in FIG. 2, 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 is radially inward 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.

As shown in FIG. 2, 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 center 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 radially outward 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.

The insulating member 200 will be described with reference to FIGS. 7, 8 and 9. FIG. 7 is a perspective view and a wiring diagram showing the stator assembly 28. The stator assembly 28 includes a stator core 22, an insulating sheet 23, a coil 24, an insulating member 200, and a connecting pin 28p. As described above, the insulating member 200 is a resin member formed by molding. As shown in FIG. 7, the insulating sheet 23 includes a slot insulator 23b and a slot key 23c that closes the opening of the slot 22s. The slot insulator 23b is inserted into the slot 22s before winding the coil 24. The slot key 23c is inserted into the slot 22s after winding the coil 24.

As described above, the coil 24 includes the three-phase coil 24, that is, the 12 coil main body portions 24a of the U-phase winding 240, the V-phase winding 241 and the W-phase winding 242, and the coil main body portion 24a for each phase. It has a crossover line 24j connecting the two, and a terminal unit 24e for each phase. The U-phase winding 240 is continuously wound in the order of the U-phase winding 240a, the U-phase winding 240b, the U-phase winding 240c, and the U-phase winding 240d. The same applies to the V-phase winding 241 and the W-phase winding 242. If the crossover wire 24j comes into direct contact with the end face of the stator core 22, insulation failure may occur there. Therefore, in this example, the insulating member 200 is interposed between the crossover wire 24j and the stator core 22. The insulating member 200 has a base 202 for supporting the crossover wire 24j of the coil 24. The base portion 202 has a disk-shaped disk plane 202a that covers the central portion of the end surface of the stator core 22. The crossover line 24j is wired along an end surface (hereinafter, referred to as “upper surface”) of the disk plane 202a opposite to the stator core 22. In the state where the coil 24 is wound, the disk plane 202a is on the inner peripheral side of the axial end of the coil main body 24a, that is, the stator core of the axial end of the coil main body 24a (upper part of FIG. 7). It is located on the 22nd side (lower side of FIG. 7). Further, the disk plane 202a is a plane perpendicular to the shaft 30.

As a result, the crossover line 24j crosses a position lower than the axial end portion of the coil main body portion 24a, and the axial end portion of the stator assembly 28 substantially coincides with the axial end portion of the coil main body portion 24a. That is, since the crossover wire 24j does not protrude outward from the axial end portion of the coil main body portion 24a, the height of the insulating member 200, in other words, the stator assembly 28 can be lowered, and the motor 10 can be made thinner.

The base portion 202 has a hollow portion 202h provided in the center of the disk plane 202a and a peripheral wall portion 202b. The base 202 has a pin support 202p to support the connecting pin 28p. The pin support portion 202p is a cylindrical protrusion protruding from the upper surface of the disk plane 202a, and is provided with a hole for press-fitting the connection pin 28p in the center.

The connection pin 28p is a wire-shaped conductive member extending in the axial direction. The connection pin 28p protrudes downward (circuit board 48 side) in the axial direction from the stator core 22. A terminal portion 24e is connected to the root side of the connection pin 28p by soldering or the like. The tip end side of the connection pin 28p is connected to the motor drive circuit 53 via the wiring board 50. With this configuration, the coil 24 is electrically connected to the motor drive circuit 53. Three connecting pins 28p for each phase of UVW and one for the midpoint are fixed to the insulating member 200. In this way, the base 202 supports the connection pin 28p and functions as a terminal block for processing the terminal 24e.

FIG. 8 is a plan view showing the stator assembly 28. From the axial viewpoint of the shaft 30, one crossover line 24j intersects a crossover line 24j different only at the point 25 on the disk plane 202a.

In the example of FIG. 8, the crossover line 24j from the U-phase winding 240b to the U-phase winding 240c located substantially opposite to each other and the crossover line from the V-phase winding 241b to the V-phase winding 241c located facing each other. 24j intersects only at point 25. Here, substantially opposite refers to the relationship between a predetermined winding and a winding (teeth portion 22t) adjacent to the winding facing the winding (teeth portion 22t), and is a concept included in the opposite winding. That is, the winding facing the predetermined winding (teeth portion 22t) refers to the winding that faces exactly and the winding that is adjacent to both sides thereof. Similarly, the crossover line 24j from the U-phase winding 240b to the U-phase winding 240c located substantially opposite to the U-phase winding 240b and the crossover line 24j from the W-phase winding 242b to the W-phase winding 242c located facing each other are only points 25. Cross at.

Further, only the point 25 is the crossing wire 24j from the V-phase winding 241b to the V-phase winding 241c located opposite to the V-phase winding 241c and the crossing wire 24j from the W-phase winding 242b to the W-phase winding 242c located facing each other. Crossed at. Further, the crossover line 24j from the U-phase winding 240b to the U-phase winding 240c and the terminal portion 24e from the V-phase winding 241d to the connection pin 28p also intersect at the point 25 only.

With the above configuration, the crossover lines 24j are not wired in parallel and intersect only at the points 25, so that the possibility of contact is reduced and rare short circuits due to scratches on the insulating film of the coil 24 can be suppressed. Further, the insulating member 200 does not require a complicated groove for accommodating the crossover wires to be wired in parallel, and the structure of the separating portion 26 is small and simple, so that the mold can be simplified.

FIG. 9 is an enlarged view showing a disk plane 202a of the stator assembly 28. The disk plane 202a includes a separation portion 26 that separates the crossover lines 24j from each other in the axial direction at positions intersecting the points 25 of the crossover lines 24j. The separation portion 26 is provided at a portion where the crossover lines 24j intersect with each other at the upper portion (upper side of FIG. 9) of the wall 27 that guides the crossover line 24j.

As a result, the crossover lines 24j intersecting in the axial direction at the point 25 can be separated vertically, the crossover lines 24j can be eliminated from contact with each other, and a rare short circuit due to scratches on the insulating film of the coil 24 can be suppressed.

Further, the separation portion 26 is located at a position lower than the axial end portion of the coil main body portion 24a.
Since the crossover wire 24j can also be made lower than the axial end portion of the coil main body portion 24a, the height of the stator assembly 28 can be lowered, and the motor 10 can be made thinner.

As shown in FIG. 9, the peripheral wall portion 202b projects axially from the upper surface of the disk plane 202a at the edge of the hollow portion 202h. The shaft 30 penetrates the inner peripheral side of the peripheral wall portion 202b. The peripheral wall portion 202b can prevent poor insulation by preventing the crossover wire 24j from coming into contact with the shaft 30.

Further, by making the peripheral wall portion 202b lower than the axial end portion of the coil main body portion 24a, the height of the stator assembly 28 can be lowered, and the motor 10 can be made thinner.

Further, the peripheral wall portion 202b may be provided with a crossover line holding portion 29 on the coil main body portion 24a side, that is, on the outer peripheral side. As a result, it is possible to prevent the crossover line 24j from falling off from the circumferential wall portion 202b and approaching the shaft 30 side. In FIG. 9, the crossover line 24j is arranged along the outer peripheral wall of the circumferential wall portion 202b, and the outer peripheral wall is attached to the shaft 30 side by connecting the coil main body portion 24a between the facing or substantially facing tooth portions 22t. It is rushing. As a result, the position of the crossover line 24j is easily determined, and the point 25 at which the crossover lines 24j intersect with each other is easily determined. Therefore, winding by the winding machine is easy without complicated operation by the winding machine. Become.

Further, since the crossover line 24j is urged toward the shaft 30 along the outer peripheral wall of the circumferential wall portion 202b, it is possible to prevent the crossover line 24j from loosening.

According to this embodiment, since the crossover wire 24j is located closer to the stator core 22 than the axial end portion of the coil main body portion 24a, the height of the insulating member 200 can be lowered, so that the brushless DC motor can be easily made thinner. can. As a result, the vertical length of the ceiling fan can be shortened and the blades can be provided at a high position to disperse the air flow over a wide range. Since the downward air flow can be spread over a wide area, it is possible to reduce the unevenness of the air volume near the floor and improve the comfort. In addition, interference with humans can be avoided. Further, by making the motor 10 thinner, the connection portion 5c of the housing 5 can be made thinner, so that the air flow guided to the blade 2 becomes smooth at this portion, which is advantageous in reducing power consumption.

The above description has been made based on the examples of the present disclosure. It will be appreciated by those skilled in the art that this embodiment is exemplary and that various variations of each of these components or combinations of processing processes are possible and that such modifications are also within the scope of the present disclosure. ..

1 ceiling fan, 4 ceiling, 5 housing, 10 motor, 20 stator, 22 stator core, 23 insulation sheet, 23e seat protrusion, 24 coil, 24j crossover, 30 shaft, 32 first bearing, 34 second bearing, 40 Rotor, 42 magnet, 48 circuit board, 50 wiring board, 51 primary side power supply circuit, 52 secondary side power supply circuit, 53 motor drive circuit, 58 wiring connection parts, 60 board holder, 100 board holder, 200 insulation member, 400 rotation detector.

Claims (4)

A brushless DC motor installed in a ceiling fan.
A stator having a stator core formed by connecting a plurality of radially extending teeth portions in an annular shape, and a coil main body portion wound around the stator core.
A shaft fixed to the center of the stator core and
A rotor having a magnet surrounding the stator core.
The stator is
An insulating member for ensuring insulation between the crossover wires connecting the coil main body is provided at the axial end.
The insulating member is
A disk plane located on the inner peripheral side of the coil main body and on the stator core side of the axial end of the coil main body is provided.
The crossover is
It is wired along the disk plane on the inner peripheral side of the coil main body, and differs only in the point on the disk plane on the inner peripheral side of the coil main body from the viewpoint from the axial direction of the shaft. Cross the crossover and
The disk plane is
A brushless DC motor including a separation portion that separates the crossover lines from each other in the axial direction at positions intersecting at the points . A brushless DC motor installed in a ceiling fan.
A stator having a stator core formed by connecting a plurality of radially extending teeth portions in an annular shape, and a coil main body portion wound around the stator core.
A shaft fixed to the center of the stator core and
A rotor having a magnet surrounding the stator core.
The stator is
An insulating member for ensuring insulation between the crossover wires connecting the coil main body is provided at the axial end.
The insulating member is
A disk plane located on the inner peripheral side of the coil main body and on the stator core side of the axial end of the coil main body is provided.
The crossover is
Wired along the disk plane, from the arrangement surface of the disk plane on the inner peripheral side of the disk plane.
It is provided with a circumferential wall portion that protrudes in the axial direction and prevents the crossover wire from coming into contact with the shaft.
The peripheral wall portion is
A brushless DC motor located closer to the stator core than the axial end of the coil body . The crossover is
The brushless DC motor according to claim 2, which is arranged along the outer peripheral wall of the peripheral wall portion and urges the outer peripheral wall toward the shaft side by connecting the coil main body portion between the facing portions of the teeth portion. The disk plane is
The brushless DC motor according to claim 1 or 2 , which is a plane perpendicular to the shaft.

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