JPH10210728A - Brushless dc fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts forming a fan motor, and improve efficiency in the work for assembling the fan motor with the reduction in the number of parts by integrally-forming a permanent magnet and a fan so as to form a fan-integrated rotor, and supporting both the ends of the integrated rotor with a bearing respectively. SOLUTION: This fan motor 1 is formed with a motor frame 2, a fan- integrated rotor 3, the first bearing 4a and the second bearing 4b for supporting the fan-integrated rotor 3 so as to rotate freely, and a fan casing 5. The first bearing 4a is inserted in the shaft 2a of the motor frame 2 so as to be fixed on it, and the second bearing 4b is inserted in the bearing fitting part 3a of the fan-integrated rotor 3 so as to be fixed on it. The first bearing 4a fixed at the shaft 2a is accommodated in the first ball housing 12 of the fan-integrated rotor 3. The second bearing 4b fitted at the fan-integrated rotor 3 is accommodated in a ball housing 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless DC motor with a fan used for a water heater, an air conditioner and the like.

[0002]

2. Description of the Related Art In a conventional brushless DC motor with a fan used for a water heater, an air conditioner, and the like, a motor for driving the fan and a fan are separately assembled, and the fan and the motor are combined. Was composed.

A sirocco fan type brushless DC fan motor used in a conventional water heater will be described with reference to FIG. FIG. 4 is a side sectional view of a conventional brushless DC fan motor.

In FIG. 4, a brushless DC motor 31
Comprises a motor frame 32, a rotor 33, two bearings 34a and 34b, and a bearing bracket 36 having a ball housing 35.

The motor frame 32 includes a stator 39 having a stator core 37 formed by stacking iron cores, a plurality of windings 38 wound around the stator core 37, and a winding 3.
A substrate 40 provided adjacent to the stator 39 for connecting the portions 8 is molded by a premix 41. The motor frame 32 is formed with a ball housing 42 for accommodating one of the bearings 34b during molding.

The rotor 33 includes a shaft 43, a rotor core 44 mounted on the circumference of the shaft 43, and a permanent magnet 45 mounted on the outer circumference of the rotor core 44.
It is composed of

[0007] Bearings 34 are provided at both ends of the shaft 43.
a and 34b are pressed into the rotor frame 3 by the motor frame 3.
2 and one bearing 34b is inserted into the motor frame 3
2 in the ball housing 42. Then, the other bearing 34a is stored in the ball housing 35 of the bearing bracket 36, and the bearing bracket 36
Is fixed to the motor frame 32, and the brushless DC motor 31 is assembled.

The fan casing 46 includes a lower box 47 and an upper lid 48. The upper lid 48 is provided with a suction port 48a for sucking air.

Then, the sirocco fan 49 is connected to the shaft 4.
3, the sirocco fan 49 is housed in the fan casing 46, and the lower surface of the lower box 47 of the fan casing 46 is attached and fixed to the flange surface 31 a of the brushless DC motor 31 to form a brushless DC fan motor.

[0010]

As described above, in the prior art, a fan is mounted on a completed brushless DC motor, and the fan is housed in a fan casing to form a brushless DC fan motor. Also, time was spent in assembling work.

[0011]

Therefore, according to the present invention, there is provided a stator having a bowl shape, accommodating a stator core in a circumferential portion, and having a shaft extending from a bottom portion in an axial direction; And a first magnet fixed to the outer periphery of one end, and a permanent magnet arranged to face the stator core, and formed on the inner periphery of this end. A first ball housing for accommodating the first bearing, a fan attached to a central portion, and a fan-integrated rotor constituted by a bearing attachment portion provided at the other end. A brushless DC fan motor, comprising: a second bearing inserted into and fixed to the bearing mounting portion; and a second ball housing for accommodating the second bearing.

[0012]

A permanent magnet and a fan are integrally formed to form a fan-integrated rotor. One end of the fan-integrated rotor is supported by a bearing fixed to a shaft formed on a motor frame, and the other end is provided with a ball housing on a part of a casing that covers the fan. It is formed and supported by a bearing housed in the ball housing.

[0013]

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of a brushless DC fan motor of a sirocco fan type according to the present invention. FIG.
Is the brushless DC of FIG. 1 viewed from the fan casing side.
It is a front view of a fan motor. FIG. 3 is a side sectional view of a brushless DC fan motor of a cross flow fan type.

In FIGS. 1 and 2, a sirocco fan type brushless DC fan motor 1 (hereinafter simply referred to as a fan motor) includes a motor frame 2, a fan-integrated rotor 3, and a fan-integrated rotor 3. A first bearing 4a and a second bearing 4 for supporting and rotating freely
b and the fan casing 5.

The motor frame 2 comprises a stator 8 having a stator core 7 on which a winding 6 is wound, and a substrate 9 for connection between the windings, which is formed into a bowl shape using a premix 10 (or resin or the like). Molded. Further, a shaft 2a extends axially from the center of the bottom in the bowl-shaped motor frame 2.

The fan-integrated rotor 3 has a permanent magnet 11 mounted on the outer periphery of one end, a first ball housing 12 formed on the inner periphery of this end, and a center mounted portion. Sirocco fan 13 and a bearing mounting portion 3a formed at the other end.

The fan casing 5 covers the sirocco fan and forms an air passage. The fan casing 5 is composed of a lower box 14 and an upper lid 15, and a suction port 16 for sucking air is provided at a central portion of the upper lid 15. Is provided with a second ball housing 18 supported by a plurality of ribs 17.

The shaft 2a of the motor frame 2
Then, the first bearing 4a is inserted and fixed. Then, the second bearing 4b is inserted into and fixed to the bearing mounting portion 3a of the fan-integrated rotor 3.

Then, the first bearing 4a fixed to the shaft 2a is housed in the first ball housing 12 of the fan-integrated rotor 3. At this time, the permanent magnet 11
And the inner peripheral surface of the stator core 7 are arranged so as to face each other.

Then, the lower box 14 of the fan casing 5 is mounted on the flange surface 2b of the motor frame 2 and fixed. At this time, the sirocco fan 13 is housed inside the fan casing 5. And. The second bearing 4b attached to the fan-integrated rotor 3 is housed in the second ball housing 18, and the fan motor 1
Are formed.

In FIG. 3, a cross-flow fan motor 20 used for an air conditioner or the like is provided with a motor frame 2.
1, a fan-integrated rotor 22, a first bearing 23a,
It comprises a second bearing 23b, a bearing bracket 25 having a second ball housing 24 for accommodating the second bearing 23b, and a base 26 supporting the motor frame 21 and the bearing bracket 25.
The motor frame 21 is formed by molding a stator and a substrate by premixing, similarly to the sirocco fan motor 1. A shaft 21a extends axially from the center of the bottom in the motor frame 21.

The fan-integrated rotor 22 has a permanent magnet 27 mounted on the outer periphery of one end, a first ball housing 28 formed on the inner periphery of this end, and a center mounted portion. A cross flow fan 29 and a bearing mounting portion 22a formed at the other end.

The shaft 2 of the motor frame 21
The first bearing 23a is inserted and fixed to 1a. Then, the bearing mounting portion 22a of the fan-integrated rotor 22
Then, the second bearing 23b is inserted and fixed.

Then, the first bearing 23a fixed to the shaft 21a is housed in the first ball housing 28 of the fan-integrated rotor 22. At this time, the outer peripheral surface of the permanent magnet 27 and the inner peripheral surface of the stator core are arranged to face each other. The second bearing 4b is housed in the second ball housing 18 to form the fan motor 20.

The base 26 adjusts the positions of the motor frame 21 and the bearing bracket 25 so that the first bearing 23a and the second bearing 23b are arranged coaxially. In addition, bearing bracket 25 and base 2
6 play a role of a fan casing that covers the cross flow fan 29.

[0026]

According to the present invention, the number of parts constituting the fan motor can be reduced, and the efficiency of the assembling operation of the fan motor accompanying the reduction in the number of parts can be improved.

[0027]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a sirocco fan type brushless DC fan motor according to the present invention.

FIG. 2 is a front view of the brushless DC fan motor of FIG. 1 as viewed from a fan casing side.

FIG. 3 is a side sectional view of a cross flow fan type brushless DC fan motor.

FIG. 4 shows a conventional inner rotor type brushless DC.
The sectional side view of a fan motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Brushless DC fan motor 2, 21, 32 ... Motor frame 2a, 43 ... Shaft 3, 22 ... Fan integrated rotor 4a, 23a ... First bearing 4b, 23b ... Second bearing 5, 46 ... Fan casing 6, 38 ... winding 7, 37, 44 ... stator core 8, 39 ... stator 9, 40 ... board 10, 41 ... premix 11, 27, 45 ... permanent magnet 12 ... first ball housing 13, 49 ... Sirocco fan 14,47 ... Lower box 15,48 ... Top lid 16 ... Suction port 17 ... Rib 18,24 ... Second ball housing 20,28,35,42 ... Ball housing 25,36 ... Bearing bracket 26 ... Base 29 … Cross flow fan 31… brushless DC motor 33… rotor 34a, 34b… bearing

Claims (1)

[Claims] 1. A stator formed in a bowl shape and containing a stator core in a circumferential portion and having a shaft extending axially from a bottom portion, and a first bearing inserted into and fixed to the shaft. A permanent magnet attached to an outer peripheral portion of one end and arranged so as to face the stator core; and a permanent magnet formed on an inner peripheral portion of the end portion for housing the first bearing. A fan-integrated rotor composed of one ball housing, a fan attached to a central portion, and a bearing attachment portion provided at the other end; and inserted into and fixed to the bearing attachment portion. A brushless DC fan motor comprising: a second bearing; and a second ball housing for accommodating the second bearing.