JP3289414B2 - Brushless motor fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small brushless motor fan having a relatively high output and used for a domestic water heater or the like.

[0002]

2. Description of the Related Art In recent years, with the miniaturization of home electric appliances and the like, there has been a strong demand for lighter, thinner and shorter motor fans used for them.

A conventional motor fan will be described below with reference to FIG. FIG. 4 shows a conventional brushless motor fan. In FIG. 4, 21 is a stator core,
22 is a rotor core, 23 is a permanent magnet, 24 is a shaft, 25 is a bearing, 26 is a housing holding the bearing 25, 27 is a fan, 28 is a nut for fixing the fan 27 to the end of the shaft 24, and 11 is a drive. A printed wiring board on which circuit components and a position sensor are mounted, 10 is a power element mounted on the printed wiring board 11, 31 is a stator core 21 and the printed wiring board 1.
A thermosetting resin 1 is formed and solidified integrally, and a bracket 32 is fixed to the anti-suction side main plate of the fan casing.

The heat generated from the power element section 10 mounted on the printed wiring board 11 is
1 is radiated.

[0005] In addition, the cooling fin is attached to a component that generates a large amount of heat among the components for the drive circuit, and the resin is molded, so that the cooling fin comes into contact with a bracket for supporting the rotor. It has been proposed to dissipate heat.

Hereinafter, the above-mentioned conventional proposal will be described with reference to FIG. In FIG. 5, the printed wiring board 11 attached to the core insulating layer 33 includes a sensor 35 inserted into a sensor fixing base 34 formed to have a pitch of 120 electrical degrees, a motor drive IC 30 and an IC 30.
Cooling fins 36 for dissipating the heat generated from the fins. Parts such as the stator core 21, the windings 37, the printed wiring board 11 and the like are integrally molded and solidified with a thermosetting resin 31 having electrical insulation properties to constitute a stator. One end of the cooling fin 36 is in contact with the motor drive IC 30, and the other end is a resin housing 38 formed by resin molding.
When the bracket 39 on the non-load side is mounted on the resin housing 38, the cooling fin 36 and the bracket 39 are in contact with each other.

[0007] Also, an outer rotor type motor is
An outer rotor motor has been proposed in which safety is enhanced by providing cooling means for heat generated by the stator and suppressing overheating of the stator and a rotor cup around the stator.

FIG. 6 is a structural view of the conventional outer rotor motor. The rotor cup 40 is provided to the stator 41 so as to be freely ventilated. The shaft 4 of the rotor cup 40
A plurality of end face side fins 43 are provided at regular intervals around the two fixed portions. The end face side fin 43 has a rotor cup 40
A ventilation hole 43a for taking in air is opened in the same rotational direction. Vent hole 43 with rotation of rotor cup 40
Air is taken in from a, flows between the rotor cup 40 and the stator 41, and is discharged from the end of the rotor cup 40. The heat of the stator 41 is cooled by this air.

[0009]

However, in the configuration shown in FIG. 4 of the related art, the heat generated from the power element section 10 mounted on the printed wiring board 11 is not sufficiently dissipated and causes malfunction. In the configuration shown in FIG. 5, it is necessary to add another component such as a cooling fin as a means for radiating heat generated by the motor drive IC 30. 6, when used as a motor fan in a relatively dusty environment such as Kanto loam, dust or the like adheres between the rotor cup 40 and the stator 41, and the rotation of the rotor cup 40. It is conceivable that the load will be applied and the motor will be locked in the worst case.

[0010] The present invention solves the above-mentioned conventional problems, and effectively eliminates heat generated from a stator core having a winding and a power element mounted on a printed wiring board without using a special heat sink. It is an object of the present invention to provide a small-sized, high-output, and highly-safe brushless motor fan by dissipating heat to the motor.

[0011]

SUMMARY OF THE INVENTION To achieve this object, a brushless motor fan according to the present invention has an iron core having a plurality of slots, and a winding wound on the iron core slot via an insulator. A stator, a permanent magnet rotor arranged to face the magnetic pole surface of the stator, a centrifugal fan attached to the rotor, a fan casing, and a bearing for rotatably holding the rotor; A housing that holds the bearing and is mounted on the stator, a drive circuit component including a control circuit unit and a power element unit, and a printed wiring board on which the stator is mounted,
A housing cover that also serves as at least a part of the anti-suction side main plate of the fan casing and supports a housing mounted on the stator, wherein surfaces of the housing and the power element mounted on the printed wiring board abut on the housing cover; The housing is formed so as to be integral with the housing cover, and the stator is in contact with the housing portion of the housing cover, and the surface of the power element mounted on the printed wiring board is in contact with the housing cover. It is assumed that the housing and the heatsink of the power element mounted on the printed wiring board are integrally formed of resin material.The stator is mounted on the housing, and the printed wiring board is the power element. Is fixed so that the surface of the It has a configuration.

[0012]

With this structure, heat generated from the stator core and the power element mounted on the drive circuit can be effectively dissipated to the housing cover supporting the housing mounted on the stator. A small heat radiating plate or a structure that cools the inside of the motor is not used to suppress a decrease in motor torque, suppress element damage due to heat generated in the power element section, and provide a small-sized, high-output motor fan at low cost.

[0013]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural sectional view of a brushless motor fan according to a first embodiment of the present invention, wherein 1 is an iron core having a plurality of slots, 2 is an insulator, 3 is a winding, 4 is an iron core 1, and A stator having a winding 3 applied to a slot of an iron core 1 via an insulator 2, a permanent magnet rotor 5 disposed opposite to a magnetic pole surface of the stator 4, and 6 attached to the rotor 5. Centrifugal fan, 7 is a fan casing, 8 is a bearing for rotatably holding the rotor 5, 9 is a housing for holding the bearing 8 and mounted on the stator 4, 10 is a power element section, and 11 is for control. 1 is a printed circuit board on which a driving circuit component including a circuit section and a power element section 10 and a stator 4 are mounted.

The brushless motor fan configured as described above includes a housing cover 13 that also serves as at least a part of the anti-suction side main plate 12 of the fan casing 7 and supports the housing 9 mounted on the stator 4. The housing 9 and the power element unit 10 mounted on the printed wiring board 11 are arranged and fixed so that the surfaces thereof abut on the housing cover 13.

With the above configuration, the heat generated from the stator 4 is applied to the housing cover 13 contacted via the housing 9 while the heat generated from the power element unit 10 mounted on the printed wiring board 11 is applied to the housing cover 13. The heat is effectively dissipated to the housing covers 13 in contact with each other.

As described above, according to the brushless motor fan of the embodiment of the present invention, the stator 4 and the power element 10
Can effectively dissipate the heat generated from the housing cover 13 to suppress a decrease in the motor torque and suppress element damage due to heat generation in the power element section.
A small and high-output motor fan can be realized.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, 1 is an iron core having a plurality of slots, 2 is an insulator, 3 is a winding, 4 is an iron core 1 and a winding 3 formed on the slot of the iron core 1 through an insulator 2. , 5 is a permanent magnet rotor arranged opposite to the magnetic pole surface of the stator 4, 6 is a centrifugal fan attached to the rotor 5, 7 is a fan casing, 8 is the rotor 5 is rotatable , A housing 9 that holds the bearing 8 and is mounted on the stator 4, 10 is a power element unit,
Reference numeral 1 denotes a printed circuit board on which a driving circuit component including a control circuit unit and a power element unit 10 and a stator 4 are mounted.

The brushless motor fan configured as described above has a housing cover 13 that also serves as at least a part of the anti-suction side main plate 12 of the fan casing 7 and supports the housing 9 mounted on the stator 4. .

The above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that the housing portion is formed as a single piece with the housing cover 13, and the stator 4 contacts the housing portion integrated with the housing cover 13 and the surface of the power element portion 10 contacts the housing cover 13. This is a configuration that is arranged and fixed so as to be in contact with each other.

With the above configuration, the heat generated from the stator 4 is directly applied to the housing cover 13, and the heat generated from the power element unit 10 mounted on the printed wiring board 11 is applied to the housing cover 13 in contact with the housing cover 13. Effectively dissipates heat.

As described above, according to the brushless motor fan of the embodiment of the present invention, the stator 4 and the power element 10
To effectively dissipate the heat generated from the heat to the housing cover 13, suppress the reduction of the motor torque, suppress the element damage due to the heat generated by the power element, and realize a small, high-output motor fan at low cost. Can be.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, reference numeral 1 denotes an iron core having a plurality of slots, reference numeral 2 denotes an insulator, reference numeral 3 denotes a winding, reference numeral 4 denotes an iron core 1, and a winding 3 formed on the slot of the iron core 1 via an insulator 2. , 5 is a permanent magnet rotor arranged opposite to the magnetic pole surface of the stator 4, 6 is a centrifugal fan attached to the rotor 5, 7 is a fan casing, 8 is the rotor 5 is rotatable , A housing 9 that holds the bearing 8 and is mounted on the stator 4, 10 is a power element unit,
Reference numeral 1 denotes a printed circuit board on which a driving circuit component including a control circuit unit and a power element unit 10 and a stator 4 are mounted.

The motor fan configured as described above includes a housing cover 13 that also serves as at least a part of the anti-suction side main plate 12 of the fan casing 7 and supports the housing 9 mounted on the stator 4.

The above is the same as the configuration shown in FIGS. 1 and 2 is that the housing cover 13 is formed integrally with the heat radiating plate 14 which is in contact with the surfaces of the housing 9 and the power element unit 10 by thermosetting or thermoplastic resin. This is the point of the configuration.

With the above configuration, heat generated from the stator 4 is generated in the housing 9 integrally formed with the housing cover 13, and heat generated from the power element unit 10 mounted on the printed wiring board 11 is generated in the housing 9. The heat is effectively dissipated to the heat radiating plate 14 formed integrally with the cover 13.

As described above, according to the brushless motor fan of the embodiment of the present invention, the stator 4 and the power element 10
Can effectively dissipate the heat generated from
It is possible to suppress a decrease in motor torque and suppress element damage due to heat generation of the power element, thereby realizing a small and high-output motor fan. Further, by converting the housing cover 13 to resin, vibration from the stator during rotation of the motor can be suppressed, and a brushless motor fan and hot water supply equipment with low vibration and low noise can be provided.

[0030]

As described above, the housing cover which also serves as at least a part of the main plate on the anti-suction side of the fan casing and supports the housing mounted on the stator is mounted on the stator having the winding. By adopting a configuration in which the housing and the surface of the power element mounted on the printed wiring board are arranged and fixed so as to abut on the housing cover, heat generated from the stator and the power element portion is effectively radiated to the housing cover. The motor fan can be dissipated, the decrease in motor torque can be suppressed, and element damage due to heat generation in the power element section can be suppressed, so that a small and high-output motor fan can be realized.

Further, the housing cover is formed as an integral throttle with the housing, and the stator is arranged and fixed to the housing portion integrated with the housing cover such that the surface of the power element portion comes into contact with the housing cover. As a result, the heat generated by the stator and the power element is effectively dissipated to the housing cover, suppressing a decrease in motor torque and suppressing element damage due to the heat generated by the power element. It can be realized at low cost.

Further, by forming the housing cover integrally with the housing and a heat radiating plate abutting on the surfaces of the power element portion by thermosetting or thermoplastic resin, the stator and the power element portion are formed. This effectively dissipates heat generated from the motor, suppresses a decrease in motor torque, suppresses element damage due to heat generated by the power element, and realizes a small-sized, high-output brushless motor fan. In addition, by using resin as the housing cover, vibration from the stator during rotation of the motor can be suppressed, and a brushless motor fan with low vibration and low noise can be realized.

[Brief description of the drawings]

FIG. 1 is a structural sectional view of a brushless motor fan according to a first embodiment of the present invention.

FIG. 2 is a structural sectional view of a brushless motor fan according to a second embodiment of the present invention.

FIG. 3 is a structural sectional view of a brushless motor fan according to a third embodiment of the present invention.

FIG. 4 is a structural sectional view of a conventional brushless motor fan.

FIG. 5 is a structural sectional view of another conventional brushless motor fan.

FIG. 6 is a cross-sectional view of the structure of another conventional brushless motor fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Insulator 3 Winding 4 Stator 5 Rotor 6 Centrifugal fan 7 Fan casing 8 Bearing 9 Housing 10 Power element part 11 Printed wiring board 12 Main plate 13 Housing cover 14 Heat sink

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Dohi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-93440 (JP, A) JP-A 64- 23755 (JP, A) Japanese Utility Model 1-79350 (JP, U) Japanese Utility Model 4-17675 (JP, U) Japanese Utility Model 2-146977 (JP, U) Japanese Utility Model 5-9178 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 29/00 H02K 7/14 H02K 9/22 H02K 21/00

Claims (2)

(57) [Claims] An iron core having a plurality of slots;
With windings applied through insulators in the slots of the core
A stator, and a permanent magnet arranged opposite to a pole face of the stator.
Historic rotor and centrifugal fan provided on the rotor
, The fan casing and the rotor are rotatably held
Bearing and the stator while holding the bearing
Housing to be mounted, control circuit section and power element section
Mounting the drive circuit components and the stator
Motor fan comprising a printed wiring board,
At least the anti-suction side main plate of the fan casing
A housing that doubles as a part and is attached to the stator
A housing cover for supporting the housing cover;
Is mounted on the housing and the printed wiring board
The heatsink of the power element is integrally molded of resin
Wherein the stator is mounted on the housing,
The printed circuit board has the power element surface integrally molded
It is characterized by being arranged and fixed so as to contact the hot plate
Brushless motor fan. 2. A brushless motor drive according to claim 1,
A hot water supply device equipped with a heater.