JP2000312462A - Brushless motor and brushless fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brushless motor and a brushless fan motor which have good motor characteristics, a smaller number of components, ease of assembling, and superior cost performance. SOLUTION: In a brushless fan motor 10, a stator base 30 is held between a housing 12 and a yoke 14 to form a ventilation path 20, wherein a rotary fan 22 is housed. A coil 32 for applying a rotating magnetic field to a rotor magnet 28 of the rotary fan 22 is installed on the stator base 30. In a part of the yoke 14 facing the coil 32, an insert iron plate 34 is buried as an integral part of the yoke. The insert iron plate 34 forms a part of a magnetic circuit when the rotary fan 2 is rotating and stops and holds the rotary fan 22 at a prescribed stop position through attraction or repulsion between itself and the rotor magnet 28, when the rotary fan 22 stops, thus dispensing with a positioning magnet, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor and a brushless fan motor, and more particularly to a brushless motor and a brushless fan motor suitable for use as a blower (ventilator) for a temperature detecting sensor in a vehicle interior in an air conditioner of a vehicle or the like. .

[0002]

2. Description of the Related Art Brushless motors and brushless fan motors are used in various fields. For example, they are widely used as air blowers (ventilators) for temperature detection sensors in vehicle compartments in auto air conditioners of vehicles and the like.

[0003] Such a brushless fan motor, for example, has a casing. The casing is formed in a spiral shape as a whole, and a ventilation path is formed between the inlet and the outlet. A rotating fan (rotor) integrally including a rotor magnet is rotatably accommodated in the casing (ventilation path). Further, a coil (stator armature) for applying a rotating magnetic field to the rotor magnet of the rotating fan is disposed on a side surface of the ventilation path. The coil is mounted on a stator mounting base, and the stator mounting base is fixed to an iron yoke. Further, a positioning magnet for positioning the rotor magnet is fixed to the stator mounting base.

When the coil is energized, an iron yoke forms a part of a magnetic circuit, and a rotating magnetic field is applied to a rotor magnet to rotate a rotating fan, whereby air is sucked from an inlet and discharged from an outlet. Air can be exhausted,
Further, when the rotating fan is stopped, the stopped state of the rotating fan is maintained (positioned at a predetermined position due to generation of detent torque) due to the attraction or repulsion of the positioning magnet and the rotor magnet (for example, And JP-B 5-52131.

[0005] In the conventional brushless fan motor of this type, since the yoke itself is made of iron, the magnetic flux easily passes through the coil (it is easy to apply a rotating magnetic field to the rotor magnet), and the motor characteristics are good. Since it is indispensable, the number of parts is large, the assembly is complicated, and the cost is high.

On the other hand, there is a brushless fan motor in which a yoke is made of resin instead of an iron yoke, a drive circuit is directly arranged on the resin yoke, and an iron plate is provided on a rotating fan. Although this type of brushless fan motor does not require a stator mounting base or the like, and the device becomes smaller as a whole, the mass of the rotating fan inevitably increases, and the iron plate provided on the rotating fan is relatively separated from the coil. As a result, the magnetic flux does not easily pass through the coil (it is difficult to apply a rotating magnetic field to the rotor magnet), and the motor characteristics deteriorate.

As described above, the conventional brushless fan motor (brushless motor) has advantages and disadvantages in terms of motor characteristics, number of parts, assemblability, and cost.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brushless motor and a brushless fan motor which are excellent in motor characteristics, number of parts, assemblability, and cost in view of the above facts.

[0009]

According to a first aspect of the present invention, there is provided a brushless motor rotatably provided in a case and having an N-pole and an S-pole alternately magnetized along a circumferential direction. A rotor magnet rotated by force,
A stator armature that applies a rotating magnetic field to the rotor magnet, and is provided to face the stator armature, forms a part of a magnetic circuit when the rotor magnet rotates, and when the rotor magnet is stopped, A plate-shaped magnetic member that holds the rotor magnet in a stopped state by an attraction action or a repulsion action with the rotor magnet.

In the brushless motor according to the first aspect, when the stator armature is energized, the magnetic member forms a part of a magnetic circuit, and the rotor magnet is rotated by applying a rotating magnetic field to the rotor magnet. Further, when the rotor magnet is stopped, the stopped state of the rotor magnet is held by the attraction or repulsion between the magnetic member and the rotor magnet (detent torque is generated and positioned at a predetermined position).

Here, a special positioning magnet or the like is provided for the magnetic member provided opposite to the stator armature to form a part of the magnetic circuit when the rotor magnet rotates and to keep the rotor magnet stopped. It becomes unnecessary. Therefore, the number of parts is reduced, the size of the apparatus is reduced as a whole, the assemblability is improved, and the cost is reduced.

Further, since the magnetic member can be arranged close to the stator armature, magnetic flux easily passes through the stator armature (rotational magnetic field is easily applied to the rotor magnet), and motor characteristics are improved. .

As described above, the brushless motor according to the first aspect is excellent in motor characteristics, number of parts, assemblability, and cost.

According to a second aspect of the present invention, there is provided the brushless motor according to the first aspect, wherein the magnetic member is embedded in the case.

In the brushless motor according to the second aspect, since the magnetic member provided to face the stator armature is buried in the case, the magnetic member can be arranged close to the stator armature. . Therefore, the magnetic flux easily passes through the stator armature (rotating magnetic field is easily applied to the rotor magnet), and the motor characteristics are improved.

Further, the number of parts does not increase, the assembling property is improved, and the cost is further reduced.

As described above, the brushless motor according to the second aspect is more excellent in terms of motor characteristics, number of parts, assemblability, and cost.

A brushless motor according to a third aspect of the present invention is the brushless motor according to the first or second aspect, wherein the magnetic member has a notch cut out at a predetermined angle corresponding to one magnetic pole angle of the rotor magnet. It is characterized by having a part.

In the brushless motor according to the third aspect, since the magnetic member is provided with a notch cut out by a predetermined angle corresponding to one magnetic pole angle of the rotor magnet, the notch angle of the notch is adjusted. (Set to a predetermined value)
It is possible to change the magnitude of the detent torque (the holding force of the rotor magnet due to the attraction or repulsion between the magnetic member and the rotor magnet) when the rotor magnet stops. Therefore, by suitably setting the notch angle of the notch, the detent torque can be suitably increased, and the positioning at the time of stopping the rotor magnet can be ensured (the rotor magnet is reliably positioned at the predetermined position). be able to).

According to a fourth aspect of the present invention, in the brushless motor according to the third aspect, the notch angle of the notch is 35% to 130% of one magnetic pole angle of the rotor magnet. It is characterized by being set.

As described above, the magnitude of the detent torque has a correlation with the notch angle of the notch provided in the magnetic member. However, if attention is paid only to the magnitude of the detent torque, the stopping characteristic of the rotor magnet is good. However, on the other hand, the starting characteristics of the rotor magnet deteriorate.

In this regard, in the brushless motor according to the fourth aspect of the present invention, the notch angle of the notch is set at an angle of 35% to 130% with respect to one magnetic pole angle of the rotor magnet. The stopping characteristics and starting characteristics of the magnet can be obtained.

According to a fifth aspect of the present invention, there is provided a brushless fan motor having a case in which an air passage is formed between an intake port and an exhaust port, an N pole provided rotatably in the case, and having a circumferentially extending N pole. And the S pole are alternately magnetized, and a rotor magnet that rotates by the applied electromagnetic force, and rotates in accordance with the rotation of the rotor magnet to suck air from the suction port and discharge the air from the discharge port. A rotating fan, a stator armature for applying a rotating magnetic field to the rotor magnet, and a portion provided to face the stator armature, forming a part of a magnetic circuit when the rotating fan rotates, and A plate-shaped magnetic member that holds the stopped state of the rotating fan by an attraction action or a repulsion action with the rotor magnet when the fan stops. That.

In the brushless fan motor according to the fifth aspect, a rotor magnet is rotatably provided in an air passage formed in the casing, and the rotary fan rotates in accordance with the rotation of the rotor magnet.

When the stator armature is energized, the magnetic member forms a part of a magnetic circuit, and a rotating magnetic field is applied to the rotor magnet to rotate, and the rotating fan rotates accordingly. Thereby, air is sucked in from the suction port and air is discharged from the discharge port. Further, when the rotating fan (rotor magnet) is stopped, the stopped state of the rotating fan is maintained by the attraction or repulsion between the magnetic member and the rotor magnet (detent torque is generated and positioned at a predetermined position).

Here, a magnetic member provided opposite to the stator armature forms a part of a magnetic circuit when the rotating fan (rotor magnet) rotates, and also holds the stopped state of the rotating fan (rotor magnet). Therefore, a special positioning magnet or the like becomes unnecessary. Therefore, the number of parts is reduced, the size of the apparatus is reduced as a whole, the assemblability is improved, and the cost is reduced.

Further, since the magnetic member can be arranged close to the stator armature, magnetic flux easily passes through the stator armature (rotational magnetic field is easily applied to the rotor magnet), and motor characteristics are improved. .

As described above, the brushless fan motor according to the fifth aspect is excellent in motor characteristics, number of parts, assemblability, and cost.

A brushless fan motor according to a sixth aspect of the present invention is the brushless fan motor according to the fifth aspect, wherein the magnetic member is embedded in the case.

In the brushless fan motor according to the present invention, since the magnetic member provided to face the stator armature is embedded in the case, the magnetic member can be arranged close to the stator armature. . Therefore, the magnetic flux easily passes through the stator armature (rotating magnetic field is easily applied to the rotor magnet), and the motor characteristics are improved.

Further, the number of parts does not increase, the assembling property is improved, and the cost is further reduced.

As described above, the brushless motor according to the sixth aspect is more excellent in terms of motor characteristics, number of parts, assemblability, and cost.

A brushless fan motor according to a seventh aspect of the present invention is the brushless fan motor according to the fifth or sixth aspect, wherein the magnetic member is notched at a predetermined angle corresponding to one magnetic pole angle of the rotor magnet. It is characterized by having a notched portion.

In the brushless fan motor according to the present invention, since the magnetic member is provided with a notch cut out by a predetermined angle corresponding to one magnetic pole angle of the rotor magnet, the notch angle of the notch is adjusted. Adjustment (set to a predetermined value)
By doing so, it is possible to change the magnitude of the detent torque (the holding force of the rotor magnet due to the attraction or repulsion between the magnetic member and the rotor magnet) when the rotating fan (rotor magnet) stops. Therefore, by suitably setting the notch angle of the notch,
By suitably increasing the detent torque, it is possible to reliably position the rotating fan (rotor magnet) when stopping (the rotor magnet can be reliably positioned at a predetermined position).

According to an eighth aspect of the present invention, in the brushless fan motor according to the seventh aspect, the notch angle of the notch is 35% to 130% with respect to one magnetic pole angle of the rotor magnet. It is characterized by being set at an angle.

As described above, the magnitude of the detent torque has a correlation with the notch angle of the notch provided in the magnetic member. However, if attention is paid only to the magnitude of the detent torque, the magnitude of the rotor magnet (rotating fan) is reduced. Although the stopping characteristics are improved, the starting characteristics of the rotor magnet (rotating fan) are deteriorated.

In this regard, in the brushless fan motor according to the present invention, since the notch angle of the notch is set at an angle of 35% to 130% with respect to one magnetic pole angle of the rotor magnet, good results are obtained. The stopping characteristics and starting characteristics of the rotor magnet (rotating fan) can be obtained.

[0038]

1 and 2 show a first embodiment of the present invention.
An overall configuration of a brushless fan motor 10 according to the embodiment is shown in an exploded perspective view. FIG. 3 is a longitudinal sectional view showing the structure of the brushless fan motor 10, and FIG.
Is shown in a front view.

The brushless fan motor 10 is applied as a blower (ventilator) for a temperature detection sensor in a vehicle such as a vehicle, for example, in an auto air conditioner.

The brushless fan motor 10 includes a housing 12 and a yoke 14 as a case. The housing 12 is formed in a scroll shape (spiral shape) as a whole, and has a suction port 16 on the front side and a discharge port 18 on a corner portion.
A ventilation path 20 is formed between the inlet 16 and the outlet 18.

A rotating fan 22 is housed in the housing 12 (air passage 20). The rotating fan 22 has a rotating shaft 24 rotatably supported by the yoke 14 via a bearing 26, and a rotor magnet 28 is integrally provided on the bottom surface on the yoke 14 side.

A stator mounting base 30 is disposed on the side of the ventilation passage 20 so as to face the rotor magnet 28 of the rotating fan 22. This stator mounting base 30
Is sandwiched and fixed by the housing 12 and the yoke 14, thereby constituting a part of the ventilation passage 20 (in other words, the ventilation passage 20 is constituted by the housing 12 and the stator mounting base 30). ing).

A coil 32 as a stator armature for applying a rotating magnetic field to the rotor magnet 28 of the rotating fan 22 and another motor drive circuit element 33 are mounted on the stator mounting base 30. here,
These coils 32 and other drive circuit elements 33 are mounted on the surface of the stator mounting base 30 opposite to the rotating fan 22 (rotor magnet 28) (that is, the surface on the yoke 14 side). Therefore, these coils 32 and other motor drive circuit elements 33 are arranged so as not to protrude (expose) into the ventilation path 20 formed by the stator mounting base 30. The rotating magnetic field is applied to the rotor magnet 28 by the coil 32 to rotate the rotary fan 22, whereby air can be sucked in from the inlet 16 and air can be discharged from the outlet 18.

Further, the yoke 14 facing the coil 32 is provided with an insert iron plate 34 as a magnetic member. As shown in FIG.
Numeral 4 is integrally embedded in the yoke 14 by insert molding, and is located opposite the coil 32. The shape of the insert iron plate 34 shown in FIG. 5 is an example corresponding to the case where the rotor magnet 28 has four poles. As a result, the insert iron plate 34 is
When the rotating fan 2 rotates, a part of the magnetic circuit is formed together with the coil 32, and when the rotating fan 22 is stopped, the stopped state of the rotating fan 22 (rotor magnet 28) is maintained by the attraction or repulsion with the rotor magnet 28. It is a configuration that can be done.

On the other hand, a thermistor 36 as a temperature sensor is mounted on the stator mounting base 30 near the outlet 18. This thermistor 36 can detect the temperature of the discharged air. The thermistor 36
On both sides, that is, upstream and downstream of the relative airflow,
A pair of columns 38 are provided. The strut 38 is formed integrally with the yoke 14 so that the thermistor 36 can be prevented from falling down.

Further, a connector terminal 40 is attached to one end of the stator attachment base 30. The connector terminal 40 extends into a connector 42 provided integrally with the yoke 14. An external connector (not shown) is fitted into the connector section 42 and connected to an electric circuit section (not shown) of the vehicle.

Next, the operation of the first embodiment will be described.

In the brushless fan motor 10 having the above-described configuration, the housing 12 and the stator mounting base 30 form the ventilation passage 20, and the rotating fan 2 is provided in the ventilation passage 20.
2 is provided rotatably.

When the coil 32 is energized, the insert iron plate 34 forms a part of the magnetic circuit, and the rotor magnet 2
The rotating fan 22 rotates in response to the application of a rotating magnetic field to the rotating fan 8. As a result, air is sucked from the inlet 16 and air is discharged from the outlet 18. further,
When the rotary fan 22 (rotor magnet 28) is stopped, the stopped state of the rotary fan 22 is maintained by the attraction or repulsion between the insert iron plate 34 and the rotor magnet 28 (the detent torque is generated and the rotary fan 22 is positioned at a predetermined position). .

Here, the brushless fan motor 10
In this embodiment, the insert iron plate 34 provided opposite to the coil 32 forms a part of a magnetic circuit when the rotating fan 22 (rotor magnet 28) rotates, and
(Rotor magnet 28)
No special positioning magnet is required. Therefore, the number of parts is reduced, the size of the apparatus is reduced as a whole, the assemblability is improved, and the cost is reduced.

Further, since the insert iron plate 34 is buried integrally in the yoke 14, the insert iron plate 3
4 can be located close to the coil 32. Therefore, a magnetic flux easily passes through the coil 32 (a rotating magnetic field is easily applied to the rotor magnet 28), and motor characteristics are improved.

As described above, the brushless fan motor 10 according to the first embodiment has the motor characteristics, the number of parts,
Excellent in ease of assembly and cost.

In the first embodiment,
Although the brushless fan motor 10 having the ventilation passage 20 and the rotating fan 22 has been described, the present invention is not limited to this, and is also applicable to a mere brushless motor having no ventilation passage 20 and the rotating fan 22 (without a blowing mechanism). be able to.

Next, another embodiment of the present invention will be described.

FIGS. 6 and 7 are exploded perspective views showing the overall configuration of a brushless fan motor 50 according to a second embodiment of the present invention. FIG. 8 is a longitudinal sectional view showing the overall configuration of the brushless fan motor 50, FIG. 9 is a front view showing the configuration of the brushless fan motor 50, and FIG. The configuration of the brushless fan motor 50 is shown in a plan view.

The brushless fan motor 50 includes a housing 52 and a yoke 54 as a case. The housing 52 is formed in a scroll shape (spiral shape) as a whole. An inlet 56 is provided on the front side, and an outlet 58 is provided at a corner of the side surface. An air passage 60 is formed between the air passage 58 and the air passage 58.

A rotating fan 62 is accommodated in the housing 52 (air passage 60). The rotary fan 62 has a rotary shaft 64 rotatably supported by a yoke 54 via a bearing 66, and further has a rotor magnet 68 integrally provided so as to face a bottom surface on the yoke 54 side. In the second embodiment, the rotor magnet 68 is set to four magnetic poles, so that the angle range of one magnetic pole is 90 degrees.

A stator mounting base 70 is disposed on the side of the ventilation passage 60 so as to face the rotor magnet 68 of the rotary fan 62. This stator mounting base 70
Is fixed to the yoke 54 by caulking or the like, thereby constituting a part of the ventilation passage 60 (in other words, the ventilation passage 60 is constituted by the housing 52 and the stator mounting base 70).

A coil 72 as a stator armature for applying a rotating magnetic field to the rotor magnet 68 of the rotating fan 62 and another motor drive circuit element 73 are mounted on the stator mounting base 70. here,
These coils 72 and other motor drive circuit elements 73
Is mounted on the surface of the stator mounting base 70 opposite to the rotating fan 62 (rotor magnet 68) (that is, the surface on the yoke 54 side). Therefore, these coils 7
The second and other motor drive circuit elements 73 are arranged so as not to protrude (expose) into the ventilation path 60 formed by the stator mounting base 70. When the coil 72 is energized, a rotating magnetic field is applied to the rotor magnet 68 to rotate the rotating fan 62, whereby air can be sucked in from the inlet 56 and discharged from the outlet 58.

Further, the yoke 54 facing the coil 72 is provided with an insert iron plate 74 as a magnetic member. As shown in FIG. 11, the insert iron plate 74 is integrally embedded in the yoke 54 by insert molding, and is positioned to face the coil 72.
Accordingly, the insert iron plate 74 forms a part of a magnetic circuit together with the coil 72 when the rotary fan 62 rotates, and the rotor magnet 68 when the rotary fan 62 stops.
The suction or repulsion of the rotating fan 62
This is a configuration that can hold the stopped state of.

Further, the insert iron plate 74
Has a pair of cutouts 88 cut out at a predetermined angle as shown in FIG. The notch 88 is cut out in a substantially fan-shaped manner at a predetermined angle corresponding to one magnetic pole angle of the rotor magnet 68 described above. In the second embodiment, the notch angle is set to 100 degrees. I have.

The notch angle of the notch portion 88 provided in the insert iron plate 74 is 35% to 13% with respect to one magnetic pole angle of the rotor magnet 68, as described later in detail.
It is preferable to set the angle to 0%.

On the other hand, the suction port 56 is provided with a bridge portion 78. As shown in detail in FIGS. 8 and 10, the bridging portion 78 is bridged between opposed inner peripheral surfaces of the suction port 56 and is integrally formed with the housing 52. The bridge portion 78 is provided at one end 6 of the rotating shaft 64 of the rotating fan 62.
4a can contact, and can support the thrust load of the rotating shaft 64 of the rotating fan 62 in the thrust direction. Further, the bridging portion 78 is tapered toward the suction side (outside of the housing 52), and is configured such that the air resistance to the air flowing into the suction port 56 is reduced.

A thermistor 76 as a temperature sensor is mounted near the bridge 78 (suction port 56). The thermistor 76 has a pair of lead portions 82. The lead portions 82 are fitted into positioning grooves 84 provided near the suction port 56, and
A pair of connector terminals 8 insert-molded into 2
0 at a connecting portion 86 by welding or the like. That is, the thermistor 76 is arranged near the suction side of the bridging portion 78 so as to face the bridging portion 78. This thermistor 76 can detect the temperature of the air sucked from the suction port 56.

Further, a lead wire 90 for connecting to an electric circuit portion of the vehicle is provided at the distal end of the connector terminal 80.
Is connected.

Here, FIGS. 13 and 16 show the configuration of the connecting portion between the tip end of the connector terminal 80 and the lead wire 90 as a rear view of the brushless fan motor 50. FIG. Further, FIG.
3 is shown in a sectional view along the line 14-14, and FIG. 15 is shown in a sectional view along the line 15-15 in FIG.

In this portion, a plurality of (four in each figure, for convenience of description, four) lead wire receiving grooves 92 are formed integrally with the yoke 54 in correspondence with the lead wires 90, respectively. . Each of the lead wire receiving grooves 92 is formed in a U-shaped cross section as shown in FIG. 17 so that the lead wire 90 can enter therein. In each lead wire receiving groove 92, a pair of locking projections 94 are formed. As shown in FIG. 17, the inner width dimension D of the locking portion 94, than the outer diameter phi ₂ of the wide and the lead wire 90 than diameter phi ₁ of the core wire 90A of the lead wire 90 (coated tube 90B) It is set to be narrow. Therefore, when the lead wire 90 is fitted into the lead wire receiving groove 92, the locking projection 94 is configured to bite into the covering tube 90 </ b> B of the lead wire 90 to prevent the lead wire 90 from coming off.

Further, a positioning wall 9 is provided at the far end (right side in FIGS. 13, 14 and 16) of each lead wire receiving groove 92 so as to partially close the lead wire receiving groove 92.
6 are formed. The positioning wall 96 can be engaged with the distal end of the coating tube 90B of the lead wire 90, and by contacting the distal end of the coating tube 90B with the positioning wall 96, the lead wire 90 in the lead wire receiving groove 92 is formed.
This is a configuration in which positioning is performed. Therefore, when the lead wire 90 from which the coating tube 90B at the distal end is removed is fitted into the lead wire receiving groove 92 and the core wire 90A is connected to the distal end portion of the connector terminal 80 by soldering or the like, The end of the lead wire 90 is brought into contact with the positioning wall 96 so that the core wire 90A of the lead wire 90 is formed.
Can be engaged with the distal end of the connector terminal 80, and the lead wire 90 can be positioned in the lead wire receiving groove 92 without complicated positioning adjustment.

On the other hand, each lead wire receiving groove 9 having the above-described configuration
A pair of locking walls 98 are provided upright on the side of the second 2, and a cover 100 is attached to the locking walls 98.

A locking claw 102 is formed on the cover 100, and this locking claw 102 is
The cover 100 is inserted into each of the lead wire receiving grooves 9.
2 is attached to the locking wall 98 in a state of being covered. Further, a lead wire pressing portion 106 is formed on the cover 100. The lead wire holding portion 106
The protrusions are formed so as to correspond to the respective lead wire receiving grooves 92, and the dimensions and the like of the respective parts are set so as to press the lead wires 90 fitted in the lead wire receiving grooves 92. Therefore, the lead wire 90 fitted into the lead wire receiving groove 92 is not only locked by the locking convex portion 94 but also pressed and held by the lead wire holding portion 106, so that the lead wire can be more securely prevented from coming off. Is configured.

The lead wire holding portion 106 formed on the cover 100 is not limited to be formed so as to correspond to the entire area of the lead wire receiving groove 92, and the lead wire holding portion 1 shown in FIG.
As shown in FIG. 08, the projection may be formed so as to correspond only between the pair of locking projections 94. In this case, the covering tube 90B of the lead wire 90 is more strongly
It will bite into 4 to make sure it stays in place.

Next, the operation of the second embodiment will be described.

In the brushless fan motor 50 having the above-described structure, the housing 52 and the stator mounting base 70 form the ventilation path 60, and the rotating fan 6 is provided in the ventilation path 60.
2 is provided rotatably. When a rotating magnetic field is applied to the rotor magnet 68 of the rotating fan 62 by the coil 72, the rotating fan 62 rotates, whereby air is sucked from the suction port 56 and air is discharged from the discharge port 58.

Here, the brushless fan motor 50
Now, the lead wire 9 connected to the connector terminal 80 will be described.
Numeral 0 is fitted in the lead wire receiving groove 92, and the locking projection 94 bites into the coating tube 90 </ b> B of the lead wire 90 to prevent it from coming off.
Since the lead wire 90 is also pressed and held, even if an external force acts on the lead wire 90, the lead wire 90 does not come out unnecessarily and is securely held. For this reason, external force (stress) does not act on the connection portion between the connector terminal 80 and the core wire 90A of the lead wire 90, and problems such as disconnection are prevented and durability is improved.

Further, a positioning wall 96 is formed in each of the lead wire receiving grooves 92, and the lead wire 90 is positioned by bringing the distal end of the coating tube 90 B into contact with the positioning wall 96. Therefore, the connecting operation of the lead wire 90 can be stably performed without complicated positioning adjustment, and the number of operation steps is reduced and the workability is improved.

Here, in this brushless fan motor 50, the rotor magnet 6 is attached to the insert iron plate 74.
8 of one magnetic pole angle (in the second embodiment, 90
A pair of cutouts 88 cut out at a predetermined angle (100 degrees in the second embodiment) in a substantially fan-like shape corresponding to (degrees).
Is provided, the magnitude of the detent torque (stop holding force of the rotor magnet 68 due to the attraction or repulsion between the insert iron plate 74 and the rotor magnet 68) when the rotary fan 62 (rotor magnet 68) stops is preferable. , It is possible to obtain good stopping characteristics and starting characteristics of the rotor magnet 68 (rotating fan 62).

That is, the insert iron plate 74 provided facing the coil 72 forms a part of a magnetic circuit when the rotor magnet 68 rotates.
4 due to the difference in magnetic flux inflow / outflow through the rotating fan 6.
2 (rotor magnet 68) when the detent torque is determined. In other words, the insert iron plate 7
The detent torque is changed in accordance with the notch angle of the notch portion 88 provided at the position 4.

FIG. 19 shows a detent torque characteristic A (in other words, a stop characteristic) with respect to a notch angle of the notch portion 88 (a cut ratio relative to one magnetic pole angle of the rotor magnet 68), and a minimum operating voltage characteristic. B (in other words, the start-up characteristic) and the stop / start-up characteristic C obtained from both of the above-mentioned characteristics are shown in a normalized state (in a graph with the maximum value of each characteristic being 1).

In this case, focusing only on the magnitude of the detent torque, the rotor magnet 68 (rotating fan 6
Although the stopping characteristic of 2) is improved, the starting characteristic of the rotor magnet 68 (rotating fan 62) is deteriorated. Therefore, in FIG. 19, if the criterion that satisfies both of the above characteristics (satisfies the stop / start characteristics C) is a normalized value of 0.8 or more, the notch angle of the notch 88 will be It is understood that it is preferable to set the angle at which the notch ratio with respect to the angle is 35% to 130%. Specifically, the notch ratio for one magnetic pole angle of the rotor magnet 68 is 35% to 13%.
When the rotor magnet 68 has four magnetic poles, the notch angle of the notch portion 88 at 0% is in the range of 31.5 degrees to 117 degrees.

Therefore, in the brushless fan motor 50 according to the second embodiment, the insert iron plate 74 is cut out by a predetermined angle (100 degrees) corresponding to one magnetic pole angle (90 degrees) of the rotor magnet 68. Since the pair of cutouts 88 are provided, good stopping characteristics and starting characteristics of the rotating fan 62 (rotor magnet 68) can be obtained, and the rotating fan 62 (rotor magnet 68) can be obtained.
(When the rotor magnet 68 can be reliably positioned at a predetermined position).

The rotor magnet 68 is not limited to four magnetic poles as described above, but may be configured to have eight magnetic poles. In this case, the angle range of one magnetic pole of the rotor magnet 68 is 45 degrees, and four cutouts 89 are formed in the insert iron plate 75 as shown in FIG. Further, the notch angle of each notch portion 89 may be in a range of 15.75 degrees to 58.5 degrees so that a notch ratio with respect to one magnetic pole angle of the rotor magnet 68 is 35% to 130%.

Next, FIG. 21 is a longitudinal sectional view showing the overall configuration of a brushless fan motor 120 according to a third embodiment of the present invention. FIG. 22 is an enlarged cross-sectional view showing a configuration of a main part of the brushless fan motor 120.

The brushless fan motor 120
Has basically the same configuration as the brushless fan motor 50 according to the second embodiment, and basically the same components as those of the second embodiment have the same reference numerals as those in the second embodiment. is there.

In this brushless fan motor 120,
The rotation shaft 205 of the rotation fan 62 is the oilless metal 20.
4 and rotatably supported. The oilless metal 204 forms a bearing structure including the thrust washers 202 and a felt member 203 disposed therebetween. The felt member 203 is impregnated with oil. Further, as shown in FIG. 23, one or a plurality (in the third embodiment, three or
An oil-less metal groove 206 is formed. The oilless metal groove 206 serves as a path for air, and when the rotating shaft 205 is inserted into the oilless metal 204, the oil that has permeated the felt member 203 is
It permeates into the oilless metal groove 206 and between the rotary shaft 205 and the oilless metal 204 (sliding surface) by a capillary phenomenon. As a result, noise generated when the bearing structure is operated, that is, when the brushless fan motor 120 rotates can be reduced.

In the third embodiment,
Although the oilless metal groove 206 is formed on the outer peripheral surface of the oilless metal 204, the present invention is not limited to this.
The oil-less metal groove may be formed on the inner wall surface of the base.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an overall configuration of a brushless fan motor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the overall configuration of the brushless fan motor according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing the overall configuration of the brushless fan motor according to the first embodiment of the present invention.

FIG. 4 is a front view showing the overall configuration of the brushless fan motor according to the first embodiment of the present invention.

FIG. 5 is a front view showing a configuration of the brushless fan motor according to the first embodiment of the present invention, with a housing and a rotary fan removed.

FIG. 6 is an exploded perspective view showing an overall configuration of a brushless fan motor according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view showing an overall configuration of a brushless fan motor according to a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing an overall configuration of a brushless fan motor according to a second embodiment of the present invention.

FIG. 9 is a front view showing an overall configuration of a brushless fan motor according to a second embodiment of the present invention.

FIG. 10 is a plan view showing an overall configuration of a brushless fan motor according to a second embodiment of the present invention.

FIG. 11 is a plan view showing a configuration of a brushless fan motor according to a second embodiment of the present invention, in a state where a stator mounting base is mounted on a yoke.

FIG. 12 is a plan view showing details of a cutout provided in an insert iron plate of a brushless fan motor according to a second embodiment of the present invention.

FIG. 13 is a rear view of the brushless fan motor according to the second embodiment of the present invention.

FIG. 14 is a diagram showing a configuration of a connection portion of a lead wire of a brushless fan motor according to a second embodiment of the present invention.
14 is a sectional view taken along line 14-14 of FIG.

FIG. 15 is a diagram showing a configuration of a connection portion of a lead wire of a brushless fan motor according to a second embodiment of the present invention.
15 is a sectional view taken along line 15-15 of FIG.

FIG. 16 is a rear view of the brushless fan motor according to the second embodiment of the present invention with a cover removed.

FIG. 17 is a front view showing a configuration of a lead wire receiving groove of a brushless fan motor according to a second embodiment of the present invention.

FIG. 18 is a diagram showing a modification of the lead wire pressing portion of the brushless fan motor according to the second embodiment of the present invention.
It is sectional drawing corresponding to FIG.

FIG. 19 is a graph showing the relationship between the notch angle of the notch provided in the insert iron plate of the brushless fan motor according to the second embodiment of the present invention and the stop / start characteristics with respect to the notch ratio with respect to one magnetic pole angle of the rotor magnet. It is a diagram shown in the state where it was converted.

FIG. 20 is a plan view showing a modified example of the insert iron plate and the cutout portion of the brushless fan motor according to the second embodiment of the present invention.

FIG. 21 is a longitudinal sectional view showing the overall configuration of a brushless fan motor according to a third embodiment of the present invention.

FIG. 22 is an enlarged sectional view showing details of a bearing structure of a brushless fan motor according to a third embodiment of the present invention.

FIG. 23 is a sectional view showing details of an oilless metal and an oilless metal groove of a brushless fan motor according to a third embodiment of the present invention.

DESCRIPTION OF SYMBOLS 10 Brushless fan motor 12 Housing (case) 14 Yoke (case) 16 Inlet 18 Outlet 20 Ventilation path 22 Rotating fan 28 Rotor magnet 32 Coil (stator armature) 34 Insert iron plate (magnetic member) 50 Brushless Fan motor 52 Housing (case) 54 Yoke (case) 56 Inlet 58 Outlet 60 Ventilation path 62 Rotating fan 68 Rotor magnet 72 Coil (stator armature) 74 Insert iron plate (magnetic member) 88 Notch 120 Brushless fan motor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kaname Egawa 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. In-house (72) Inventor Asao Kino 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. F-term (reference) 3H022 AA02 BA03 CA50 DA07 DA12 DA19 DA20 3L011 AF01 5H019 AA00 AA09 AA10 CC02 DD06 EE07 EE13 EE16 FF01 FF03 GG01 5H607 AA00 BB01 BB09 BB13 CC01 CC05 DD14 FF04 GG03 GG09 GG26 J03K01 J03K01 BB03

Claims (8)

[Claims] 1. A rotor magnet rotatably provided in a case and N and S poles are alternately magnetized along a circumferential direction, and are rotated by an applied electromagnetic force. A stator armature that applies a magnetic field, and is provided to face the stator armature, and forms a part of a magnetic circuit when the rotor magnet rotates,
A brushless motor comprising: a plate-shaped magnetic member that holds the stopped state of the rotor magnet by an attraction action or a repulsion action with the rotor magnet when the rotor magnet is stopped. 2. The brushless motor according to claim 1, wherein said magnetic member is embedded in said case. 3. The brushless motor according to claim 1, wherein the magnetic member has a notch cut out by a predetermined angle corresponding to one magnetic pole angle of the rotor magnet. 4. The brushless motor according to claim 3, wherein a notch angle of the notch is set at an angle of 35% to 130% with respect to one magnetic pole angle of the rotor magnet. 5. A case in which an air passage is formed between an inlet and an outlet, and a case provided rotatably in the case, and N poles and S poles are alternately magnetized along a circumferential direction, A rotor magnet that rotates by the applied electromagnetic force, a rotating fan that rotates in accordance with the rotation of the rotor magnet to suck air from the suction port and discharge the air from the discharge port, A stator armature that applies a rotating magnetic field by rotating the rotating fan, forms a part of a magnetic circuit when the rotating fan rotates, and attracts the rotor magnet when the rotating fan stops. A plate-shaped magnetic member for holding the stopped state of the rotating fan by an action or a repulsion action. 6. The brushless fan motor according to claim 5, wherein the magnetic member is embedded in the case. 7. The brushless fan motor according to claim 5, wherein the magnetic member has a cutout portion cut out by a predetermined angle corresponding to one magnetic pole angle of the rotor magnet. 8. The brushless fan motor according to claim 7, wherein a notch angle of the notch is set at an angle of 35% to 130% with respect to one magnetic pole angle of the rotor magnet.