JPH05292728A - Dc brushless motor - Google Patents

Abstract

PURPOSE:To improve a mounting structure of a Hall element for detecting a magnetic flux on a printed board. CONSTITUTION:A hall element holder 43 is provided with a guide hole 43e for extending leads of a Hall element to the same interval as a mounting hole of a printed board. A base 43b of the holder 43 is widely formed, and a cut recess 43f is formed on a mounting surface 43c. A containing part 43d of an end 43a of the holder 32 is formed on a circular-arclike surface, and an opening 43g is formed on a surface of the part 43d at the side of a rotor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC brushless electric motor used for driving a fan of an indoor air conditioner.

[0002]

2. Description of the Related Art Conventionally, an AC induction motor which changes the number of windings to change the rotation speed has been used to drive a fan of this type. However, the AC induction motor has disadvantages that it is inefficient, does not meet the demand for energy saving, and the size of the device increases. Therefore, in recent years, a DC brushless motor has begun to be used in place of the AC induction motor.

In this DC brushless motor, as shown in FIG. 13, an output shaft 53 is rotatably supported by a housing 51 through a bearing 52, and a plurality of magnetic pole portions around which a coil is wound are provided on the output shaft 53. The stator 54, which is fitted outside with a predetermined gap, is integrally fixed in the housing by resin molding (see hatching in the figure), while the permanent magnet 58 formed by magnetizing an annular magnet material into a plurality of poles is formed. A rotor casing 57 which is fitted inside and fitted outside the stator 54 with a gap,
The central boss 57a is press-fitted into the knurled portion of the output shaft 53.

Then, when a plurality of magnetic pole portions of the inner stator 54 are sequentially excited, the outer permanent magnets 58 are attracted and repelled by the excited magnetic pole portions one after another, and the rotor casing 57 is rotated. It is transmitted to the output shaft 53 via the boss portion 57a, and the output shaft 53 rotates.

[0005]

However, since the drive circuit is incorporated in the electric motor of the above DC brushless electric motor, it is necessary to mold it with resin, resulting in high cost. Further, since there is no heat radiation fin for the driving IC and the temperature of the IC rises, the output of the electric motor must be suppressed to a small value.

Therefore, a shaft member and a plurality of magnetic pole portions are provided,
A stator that is fitted onto the shaft member with a predetermined gap, and a rotor that has a plurality of magnetic pole pieces made of permanent magnets, and is fitted onto the stator with a predetermined gap, and the stator. A DC brushless electric motor has been proposed which includes a printed circuit board having a drive circuit arranged to face one end surface of a rotor and controlling energization of a coil of the stator.

In this DC brushless electric motor, the printed circuit board is fixed to the housing or the end bracket in the housing with a clip or the like, and the resin molding as described above is not necessary, and the housing or the end bracket is used as a driving IC. Since it can be used for heat dissipation, it is possible to reduce the size and cost of the electric motor.

Therefore, an object of the present invention is to provide a DC brushless motor of the latter type as described above, in which the structure is improved so that the Hall element for detecting the magnetic flux can be easily attached to the printed circuit board. Especially.

[0009]

In order to achieve the above-mentioned object, the present invention has a shaft member 4 and a plurality of magnetic pole portions 7b, and is fixed to the shaft member 4 by a predetermined clearance. Child 7
A rotor 8 having a plurality of magnetic pole pieces 13 made of permanent magnets and fitted on the stator 7 with a predetermined gap therebetween, and the stator 7.
And the stator 7 which is disposed so as to face one end surface of the rotor 8 and
And a printed circuit board 21 having a drive circuit for controlling the energization of the coil 18 in the DC brushless motor.
The base portion 4 of the Hall element holder 43 facing the front portion 43a to 3
3b is attached to the front portion 43a of the Hall element holder 43, and a housing portion 43d of the Hall element 42 is provided. The bottom surface of the housing portion 43d and the mounting surface of the base portion 43b are parallel to each other in a divergent shape. The plurality of lead wires 42a of the Hall element 42,
It is characterized in that a guide hole 43e is provided which widens at the same interval as the mount hole 21d of the printed circuit board 21.

The base portion 43b of the Hall element holder 43
Is formed wider than the tip portion 43a, and the base portion 4
A cutting recess 43f can be provided in the guide hole portion of the mounting surface of 3b. In addition, the coil 18 of the stator 7 of the accommodating portion 43d provided at the front portion 43a of the Hall element holder 43
The side surface may be formed in an arc shape along the outer peripheral surface of the coil 18 and closed, and the surface on the rotor 8 side may be formed in an arc shape along the inner peripheral surface of the rotor 8 to be opened.

[0011]

According to the DC brushless motor of the present invention, the lead wire 42 of the hall element 42 is attached to the hall element holder 43.
By providing a guide hole 43e that widens a at the same interval as the mount hole 21d of the printed circuit board 21, the lead wire 42a of the Hall element 42 is guided into the guide hole 43e during assembly.
By simply plunging it into the mounting hole 21d, the mounting hole 21d can be naturally widened at the same interval, so that it can be easily mounted on the printed circuit board 21.

The base 43 of the hall element holder 43
By forming b to be wide, it can be mounted on the printed board 21 in a vertically stable state, so that the reliability of detection accuracy is improved. Further, by providing the cutout recess 43f on the mounting surface of the base portion 43b of the Hall element holder 43, during the soldering work of the lead wire 42a to the printed circuit board 21, the heat transmitted through the lead wire 42a is radiated and the mounting surface is melted. Can be prevented.

On the other hand, the tip portion 43 of the hall element holder 43
By forming the accommodating portion 43d of "a" in an arcuate surface, the Hall element 42 is mounted on the coil 18 of the stator 7 and the rotor 8.
You can face the narrow gap between. Moreover, the housing portion 43d can be made thinner by opening the surface of the housing portion 43d on the rotor 8 side. The surface of the stator 7 on the coil 18 side is preferably closed because the magnetic flux may not be detected when the Hall element 42 contacts the coil 18 and is bent.

[0014]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view showing an example of a DC brushless motor used to drive a fan of an indoor air conditioner.

This DC brushless motor has a bottomed cylindrical end bracket 3 fitted and fixed to a vibration-proof rubber 2 mounted on the inner peripheral surface of a cylindrical housing 1, and a center hole 3 a of the end bracket 3. A stator 7 having a central shaft (shaft member) 4 protruding by press-fitting, and a magnetic pole portion 7b, which is externally fitted and fixed to the central shaft 4 via a fixed seat 5 and a vibration-proof rubber cylinder 6, and this fixing. A rotor 8 which is externally fitted to the child 7 with a slight gap, and a vibration-proof rubber joint 10 which is externally fitted are fixed to the front end plate 8a of the rotor 8 with rivets 11, and the rotor 8 is centered. Bearing housing 9 rotatably mounted on shaft 4
Composed of and.

In the rotor 8, four permanent magnet pole pieces 13 are mounted on the inner circumferential surface of the rotor casing 12 at equal four positions on the circumference, and the rotor casing 12 is provided at the rear end thereof. ,
The rotor yoke 14 is externally fitted, and the magnetic pole piece 13 is
The outer peripheral surface is formed in an arc shape along the inner peripheral surface of the rotor casing 12, and the inner peripheral surface is formed in an arc shape along the outer peripheral surface of the stator 7. This casing 12 and yoke 1
4 is fixed by the adhesive 15 filled in the through hole.

The rotor 8 of the rotor casing 12
A bearing holding ring 16a is formed in the center of the bottom plate 16 corresponding to the front end plate 8a of the base plate, and four magnetic pole pieces 13 are radially inwardly punched from the outer circumference toward the center to bend the pole pieces 13 radially inward. 4 retainer spring pieces 16b held from
To form.

The stator 7 arranged with a gap in the rotor casing 12 has a boss portion 7a and the boss portion 7a.
6 magnetic pole parts 7b radially protruding outward from a
The coil 18 is wound around each magnetic pole portion 7b, and the outer peripheral surface of the magnetic pole portion 7b faces the inner peripheral surface of the magnetic pole piece 13 with a slight gap. The boss portion 7a is provided with an axial hole corresponding to the position of each magnetic pole portion 7b, and a coil terminal pin 19 for connecting the coil 18 to the printed board 21 is supported in this hole.

The anti-vibration rubber tube 6 is non-rotatably fitted in the boss portion 7a of the stator 7, and the anti-vibration rubber tube 6 is
A key 5a is non-rotatably fitted to a fixed seat 5 press-fitted into the central shaft 4. Further, in front of the vibration-proof rubber cylinder 6 of the central shaft 4, a vibration-proof rubber disc 20 is fitted which has a slight gap and is in contact with the front end of the coil terminal pin 19. The vibration-proof rubber tube 6 and the vibration-proof rubber disc 20 are interposed because the magnetic flux generated in the coil 18 does not have a sinusoidal shape due to the simplification of the structure of the magnetic pole portion 7b. This is to prevent the cogging generated in the above from being transmitted to the driven side fan 40 via the central shaft 4 and the bearing housing 9.

A first bearing 30 is fitted in the bearing retaining ring 16a of the bottom plate 16 of the rotor casing 12, and a washer 31 and a second bearing 32 are provided in the bearing housing 9.
It accommodates the spacer 33. The bearing housing 9 is slidably mounted between the retaining rings 34a, 34b of the central shaft 4 together with the rotor 8 joined by spot welding.
A fixed ring 35 that fits the anti-vibration rubber tube 6 and the anti-vibration rubber disc 20 with the fixed seat 5 is fitted to the central shaft 4 behind the retaining ring 34b.

An anti-vibration rubber joint 10 is fitted on the outer periphery of the bearing housing 9, and the brim portion of the anti-vibration rubber joint 10 is
It is fixed to the bottom plate 16 of the rotor 8 with rivets 11, and the center hole of the blind plate 41 of the fan 40 is fitted and fixed to the outer peripheral surface of the vibration-proof rubber joint 10. Therefore, when the rotor 8 rotates, the fan 40 is rotated via the anti-vibration rubber joint 10.

On the other hand, the end bracket 3 has a structure shown in FIG.
, Each coil terminal pin 19 of the stator 7 is attached to the printed board 21 on the outer peripheral side of the center hole 3a of the bottom plate portion.
Six elongated holes 3b for projecting to the side are 6 on the same circumference.
On the outer peripheral side of the elongated hole 3b provided at equal positions, the tip portion 43a of the Hall element holder 43 attached to the printed circuit board 21 is provided for projecting between the stator 7 and the rotor 8. The individual square holes 3c are provided at appropriate positions on the same circumference. Four positioning holes 3d are provided at appropriate positions on the same circumference on the outer peripheral side of the square hole 3c, and the corner portion between the bottom plate portion and the peripheral wall portion on the outer peripheral side of the positioning hole 3d is Four spring insertion holes 3 corresponding to each positioning hole 3d
e is provided. The vibration-proof rubber 2 is provided on the peripheral wall portion.
There are two locking holes 3f into which a part of the inner peripheral surface is inserted.

As shown in FIG. 1, the printed circuit board 21 is arranged so as to face the bottom plate portion of the end bracket 3, and is formed in a disc shape having a diameter slightly smaller than the bottom plate portion. The surface of the printed board 21 on the bottom plate side is the part mounting surface 21a, and the surface on the opposite side is the pattern surface 21b.
Is.

As shown in FIG. 4, the printed circuit board 21 is
Is provided with six elongated holes 21c corresponding to the elongated holes 3b of the bottom plate portion of the end bracket 3, and the elongated holes 21c
On the outer peripheral side of the above, three sets of four mounting holes 21d for inserting the four lead wires 42a of the Hall element 42 (see FIG. 5) are provided corresponding to the respective square holes 3c of the bottom plate portion. ing. Four positioning holes 21e corresponding to the respective positioning holes 3d of the bottom plate portion are provided on the outer peripheral side of the mounting hole 21d, and each of the positioning holes 21e is provided with an external member to prevent the printed board from cracking. Slits 21f penetrating radially are provided on the periphery. Also, the printed circuit board 2
Two semicircular bush fitting recesses 21 g are provided on the outer peripheral edge of 1.

Hall element holders 43 as shown in FIG. 6 are mounted at the positions of the mounting holes 21d of the three 4-holes on the printed circuit board 21, respectively. 1 connector 44 is attached, and the second and third connectors 45, 46 are attached near the bush fitting recess 21g, respectively.
A driver IC 47 as shown in FIG. 7 is attached to the position of the mount hole 21h for each set of 20 holes.

The Hall element 42 has four lead wires 42a as shown in FIG. The lead wires 42a are not normally spread as shown in FIG.
It extends straight from the hall element 42.

As shown in FIG. 6, the Hall element holder 43 has a narrow and long tip portion 43a and a wide and short base portion 43b.
It consists of and. Mounting surface 43c of this base portion 43b
Is attached to the printed circuit board 21, and the tip portion 43a passes through the square hole 3c of the end bracket 3 and faces the coil 18 of the stator 7 and the rotor 8. A housing portion 43d of the Hall element 42 is provided in the tip portion 43a.

The bottom surface of the accommodating portion 43d and the base portion 43
Four guide holes 43e are formed between the mounting surface 43c and the mounting surface 43c of FIG. 4b while bending from the flared shape to the parallel shape, and the parallel guiding holes 43e on the mounting surface 43c side are formed on the printed board 21. It is set at the same interval as the mount holes 21d of one set of four holes. Mounting surface 43c of the base portion 43b
The cutting recess 43f is provided in each guide hole 43e.

The tip portion 43a of the Hall element holder 43
And the surface of the base portion 43b on the side of the stator 7 is the coil 18
Is formed in an arc shape along the outer peripheral surface of the rotor, and the surface on the rotor 8 side is formed in an arc shape along the inner peripheral surface of the magnetic pole piece 13 of the rotor 8. The surface of the housing portion 43d of the tip portion 43a on the rotor 8 side is formed with an opening (cut) 43g.

In the Hall element 42, when each lead wire 42a is inserted into the guide hole 43e from the housing portion 43d side of the Hall element holder 43, each lead wire 42a is inserted into the guide hole 4a.
It is guided by 3e, and the space is naturally widened to project from the base portion 43b side to the outside. The lead wires 42a are connected to the mount holes 21d of the printed circuit board 21.
And solder it to the pattern circuit of the pattern surface 21b, and attach it to the printed circuit board 21.

The first connector 44 has its lead terminal penetrating the printed circuit board 21, and the protruding tip is soldered to the power supply pattern circuit of the pattern surface 21b shown in FIG. 12, as shown in FIG. , Mounted on the printed circuit board 21. A terminal of an electric wire 48 (see FIG. 1) from an external power supply is inserted and connected to the first connector 44.

The lead terminals of the second and third connectors 45 and 46 are passed through the printed circuit board 21, and the projecting tips of the second and third connectors 45 and 46 are attached to the coil 1 of the pattern surface 21b shown in FIG.
Solder each to the terminal processing pattern circuit of 8,
As shown in FIG. 2, it is attached to the printed board 21. As shown in FIG. 2, each of the connectors 45 and 46 has three
The terminals of one end of the flexible electric wires 49 of the set are respectively plugged and connected, and the other end of each electric wire 49 is provided with a receptacle 50 as shown in FIG. Each of the receptacles 50 has the electric wire 49 connected to the printed circuit board 21.
After diverting to the pattern surface 21b side of the
Slot 21 of 1 and slot 3 of the bottom plate of the end bracket 3
b through the coil terminal pin 19 of the stator 8
Is plugged in and connected. The receptacle 50 is covered with a heat-shrinkable insulating tube. The elongated hole 21c of the printed board 21 and the elongated hole 3b of the end bracket 3 are circumferentially elongated holes because the stator 7 vibrates due to cogging, and this vibration causes the receptacle 50 to be elongated holes 21c and 3b. This is to prevent contact with.

As shown in FIG. 7, the driver IC 47 has 20 lead terminals 47a. Each of the lead terminals 47a is inserted into the mount hole 21h of the printed board 21 shown in FIG. The penetrating and protruding tip is soldered to the pattern circuit of the pattern surface 21b and attached to the printed board 21. As shown in FIG. 1, a rubber IC sheet 23 is provided between the driver IC 47 and the printed circuit board 21.
An insulating sheet 24 made of heat resistant polyolefin and an inorganic material is attached to the heat radiation surface of 47.

As shown in FIG. 11, a semicircular rubber bush 25 is provided, and the rubber bush 25 has a groove 25a on the outer peripheral surface, a through hole 25b in the axial direction, and the through hole 2.
An electric wire insertion slit 25c extending from 5b to the outer surface is formed. The rubber bush 25 has two recesses 21g for fitting the bushes in the printed circuit board 21 and a groove 25a.
Are inserted from the radial direction and attached to the printed circuit board 21. In the through hole 25b of each rubber bush 25, from the wire insertion slit 25c to the second and third connectors 45,
The intermediate portions of the electric wires 49, which are a set of three wires 46, are inserted.

Long arcuate spacers 27 as shown in FIGS. 8A and 8B and short arcuate spacers 28 as shown in FIGS. 8C and 8D are provided, respectively. Spacer 2
Positioning protrusions 27a and 28a are provided on both surfaces of 7 and 28, respectively. Of the spacers 27 and 28, the long spacer 27 is fitted into the upper two positioning holes 21e of the printed circuit board 21 from the part mounting surface 21a side, as shown in FIG. The short spacer 28 fits one positioning protrusion 28a from the part mounting surface 21a side into the two lower positioning holes 21e.

The parts mounting surface 21a of the printed board 21 is made to face the bottom plate portion of the end bracket 3, and the other positioning protrusions 27a, 28a of the spacers 27, 28 are positioned in the positioning hole 3d of the end bracket 3.
The printed circuit board 21
Are positioned parallel to the bottom plate portion of the end bracket 3 in the rotational direction. The end surface of the rubber bush 25 contacts the end bracket 3 and functions as a spacer. Further, the driver IC 47 is
The insulating sheet 24 is pushed by the C sheet 23 and comes into close contact with the bottom plate portion of the end bracket 3. As a result, the end bracket 3 can be used as a heat radiation fin for the driver IC 47, so that the electric motor can be made compact.

As shown in FIG. 9, a substantially U-shaped spring clip 37 is provided, and this spring clip 37 has a piece 37a for inserting into the spring insertion hole 3e of the end bracket 3, The pattern surface 21 of the printed circuit board 21
It has a pressing piece portion 37b for pressing the printed board 21 toward the end bracket 3 side in contact with the outer peripheral edge portion of b, and the pressing piece portion 37b is engaged with the slit 21f of the printed board 21. V-shaped central protrusion 37c
Semicircular projections 37d, 37d are formed which are in contact with the outer peripheral edge portions on both sides of the slit 21f. The printed circuit board 2 with which the central projection 37c of the spring clip 37 is engaged
By sharing the slit 21f of No. 1 with the positioning hole 21e, the warp of the printed board 21 is reduced.

Then, as shown in FIG. 1, the insertion piece portions 37a of the four spring clips 37 are inserted into the spring insertion holes 3e of the end bracket 3 respectively, and the pressing piece portion 37 is formed.
The printed board 21 is attached to the end bracket 3 by pressing the outer peripheral edge of the pattern surface 21b of the printed board 21 with b.

In the above structure, since the guide hole 43e is provided in the Hall element holder 43, when the Hall element 42 is assembled to the Hall element holder 43, the four lead wires 42a of the Hall element 42 are connected to the Hall element holder 43. When the lead wire 42a is inserted into the guide hole 43e from the accommodating portion 43d side of the reference numeral 43, each lead wire 42a is guided by the guide hole 43e, and the interval between the lead wires 42a is naturally widened. Hole 2
It can be spread in parallel at the same interval as 1d. As a result, the lead wire 42a is attached to the mount hole 2 of the printed circuit board 21.
The work of inserting the Hall element holder 43 into the printed circuit board 21 by inserting the Hall element holder 43 into the printed circuit board 21 can be easily performed.

Further, since the base portion 43b of the hall element holder 43 is formed wide, it can be mounted on the printed board 21 in a vertically stable state, and the reliability of detection accuracy by the hall element 42 is improved.

Furthermore, since the hole element holder 43 is provided with the cutout recess 43f on the mounting surface 43c of the base portion 43b, the lead wire 42a is transmitted during the soldering work of the lead wire 42a of the hall element 42 to the printed board 21. Since the heat is radiated by the cut recess 43f, the attachment surface 43c can be prevented from melting.

Furthermore, the Hall element holder 43 is also provided.
Since the housing portion 43d of the tip portion 43a is formed in an arcuate surface, the Hall element 42 can face the narrow gap between the stator 7 and the rotor 8. Further, by forming the opening 43g on the surface of the housing portion 43d on the rotor 8 side, the housing portion 43d can be made thinner. In addition, on the surface of the stator 7 facing the coil 18, the Hall element 42 is
When it comes into contact with and is bent, the magnetic flux cannot be detected, so it is preferable to keep it closed.

On the other hand, the terminals of the flexible electric wire 49 are connected to the second and third connectors 45, 46 attached to the printed board 21, the flexible electric wire 49 is diverted to the pattern surface 21b of the printed board 21, and the receptacle 5 is inserted.
0 is inserted into the coil terminal pin 19 through the elongated holes 21c and 3b, and the middle portion of the flexible electric wire 49 is inserted from the electric wire insertion slit 25c of the rubber bush 25 into the through hole 2.
5b, and held by the rubber bush 25. As a result, even if the stator 7 vibrates due to cogging, the vibration is absorbed by the flexible electric wire 49 and is not transmitted to the printed circuit board 21 side, so that adverse effects such as vibration of the hall element 42 can be prevented.

Further, since the terminals of the flexible electric wire 49 can be inserted and connected to the connectors 45 and 46, it is possible to prevent melting of the insulating coating as in the case of connecting the electric wires by soldering. Furthermore, the receptacle 5 of the flexible electric wire 49
Since 0 can be inserted and connected to the coil terminal pin 19 of the stator 7, the connection work can be easily performed.

Furthermore, the rubber bush 25 can be formed simply by inserting the middle portion of the flexible electric wire 49 into the slit 25c.
Since it can be held by, the holding work can be performed easily, and it is possible to prevent the flexible electric wire 49 from coming loose or being damaged at the outer peripheral edge portion of the printed board 21. Moreover, since the vibration of the flexible electric wire 49 is absorbed by the rubber bush 25, the rubber bush 25 allows the printed circuit board 2 to pass through.
Vibration is not transmitted to 1.

[0046]

As is apparent from the above description, in the DC brushless motor of the present invention, the hall element holder is provided with the guide holes for expanding the lead wires of the hall element at the same intervals as the mounting holes of the printed circuit board. Is. Therefore, at the time of assembling, the lead wire of the Hall element can be naturally extended at the same interval as the mount hole by just thrusting the lead wire of the Hall element into the guide hole, so that the mounting work on the printed circuit board can be easily performed.

Moreover, since the base of the Hall element holder is formed wide, it can be mounted on the printed board in a vertically stable state, and the reliability of detection accuracy is improved. In addition, the mounting recess on the mounting surface of the base of the Hall element holder prevents the heat transferred through the lead from being dissipated and the mounting surface from melting during soldering of the lead to the printed circuit board. become able to.

Furthermore, since the housing portion at the front end of the Hall element holder is formed in an arcuate surface, the Hall element can face the narrow gap between the coil of the stator and the rotor. Moreover, since the rotor-side surface of the housing portion is opened, the housing portion can be made thinner.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a DC brushless electric motor of the present invention.

2A and 2B are a front view and a side view of a printed circuit board in an assembled state of parts.

FIG. 3 is a front view and a sectional view of an end bracket.

FIG. 4 is a front view and a side view of a printed circuit board.

5A and 5B are a plan view and a side view of a Hall element.

FIG. 6 is a rear view, a plan view, a front view and a sectional view of a Hall element holder.

FIG. 7 is a plan view, a front view, and a side view of a driver IC.

FIG. 8 is a plan view and a side view of each spacer.

FIG. 9 is a plan view, side view, and cross-sectional view of a spring clip.

FIG. 10 is a plan view and a side view of the receptacle.

FIG. 11 is a front view, a side view, and a sectional view of an insulating bush.

FIG. 12 is a drive circuit diagram.

FIG. 13 is a cross-sectional view of a conventional DC brushless electric motor.

[Explanation of symbols]

1 ... Housing, 3 ... End bracket, 4 ... Center axis,
7 ... Stator, 8 ... Rotor, 18 ... Coil, 19 ... Coil terminal pin, 21 ... Printed circuit board, 25 ... Rubber bush,
37 ... Spring clip, 42 ... Hall element, 43 ... Hall element holder, 49 ... Flexible electric wire, 50 ... Receptacle.

Claims (3)

[Claims] 1. A stator (7) having a shaft member (4) and a plurality of magnetic pole portions (7b), which is fitted onto the shaft member (4) with a predetermined gap, and a plurality of permanent magnets. A rotor (8) having a magnetic pole piece (13) made of metal and fitted on the stator (7) with a predetermined gap.
And a printed circuit board (21) having a drive circuit arranged to face one of the end faces of the stator (7) and the rotor (8) and controlling energization of the coil (18) of the stator (7). A DC brushless electric motor including: a magnetic pole piece of the rotor (8) on the printed circuit board (21);
Hall element holder (43) whose front portion (43a) faces (13)
This Hall element holder is attached with the base (43b) of
In the front part (43a) of (43), the accommodating part for the hall element (42)
(43d) is provided, and the bottom element of the hall element (42) is penetrated between the bottom surface of the accommodating portion (43d) and the attachment surface of the base portion (43b) while bending from the flared shape to the parallel shape. A DC brushless electric motor, characterized in that a guide hole (43e) is provided to expand a plurality of lead wires (42a) at the same intervals as the mount holes (21d) of the printed circuit board (21). 2. The base of the Hall element holder (43)
(43b) is formed wider than the tip portion (43a),
The cutting recess (43f) is provided in a guide hole portion of the mounting surface of the base portion (43a).
DC brushless electric motor described in. 3. A stator (7) having a shaft member (4), a plurality of magnetic pole portions (7b), and fitted on the shaft member (4) with a predetermined gap, and a plurality of permanent magnets. A rotor (8) having a magnetic pole piece (13) made of metal and fitted on the stator (7) with a predetermined gap.
And a printed circuit board (21) having a drive circuit arranged to face one of the end faces of the stator (7) and the rotor (8) and controlling energization of the coil (18) of the stator (7). A DC brushless electric motor including: a magnetic pole piece of the rotor (8) on the printed circuit board (21);
Hall element holder (43) whose front portion (43a) faces (13)
This Hall element holder is attached with the base (43b) of
In the front part (43a) of (43), the accommodating part for the hall element (42)
(43d) is provided, and the stator (7) of this accommodation part (43d)
The coil (18) side surface is formed in an arc shape along the outer peripheral surface of the coil (18) and is closed, and the rotor (8) side surface is a circle along the inner peripheral surface of the rotor (8). A DC brushless electric motor, which is formed in an arc shape and is opened.