JPH0898490A - Dc brushless motor - Google Patents

Abstract

PURPOSE: To secure permanent magnet rigidly to the casing while protecting the permanent magnet against rusting. CONSTITUTION: A spacer 67 for securing a permanent magnet 66 is arranged on the bottom part 36 of a cylindrical rotor casing 33. A plurality of permanent magnets 66 are arranged along the inner circumferential surface of the rotor casing 33 through the spacer 67. A cylindrical rotor yoke is then fitted over the rotor casing 33. Finally, they are coated with a mold resin 85 and integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC brushless motor suitable for driving a propeller fan of an outdoor unit of an air-conditioned room.

[0002]

2. Description of the Related Art Conventionally, an AC motor has been used as a motor for driving a propeller fan or the like of an outdoor unit of an air-conditioned room.
A DC brushless motor has been used in recent years for reasons such that the C motor is inefficient and has a large shape, which easily causes an obstacle in the ventilation passage and is difficult to downsize.
As a conventional example in which a DC brushless motor is used for these drive outdoor units, there is, for example, Japanese Utility Model Laid-Open No. 5-43778.

[0003]

However, in such a conventional example, the permanent magnet corresponding to the outer peripheral surface of the iron core of the stator is attached to the casing, but the permanent magnet cannot be reliably fixed to the casing, and the permanent magnet is not fixed. Since the support and fixation of the magnet becomes unstable and the permanent magnet itself is exposed, there is a problem that when used as an outdoor unit, rust occurs in the iron oxide permanent magnet due to infiltration of rainwater etc. there were.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to securely fix a permanent magnet to a casing and to prevent rust of the permanent magnet. DC brushless motor.

[0005]

Therefore, in a DC brushless motor according to a first aspect of the present invention, there is provided a stator 12 provided with an iron core 11 around which a winding 10 is wound around a fixed shaft 8 and an iron core 11 of the stator 12. A DC brushless motor having a rotor 65 including an outer peripheral surface having a corresponding permanent magnet 66 and a casing 33 supporting the permanent magnet 66.
6 is covered with a mold resin 85, and the permanent magnet 66 and the casing 33 are integrated with the mold resin 85.

The DC brushless motor according to claim 2 is
A permanent magnet 66 is attached to the bottom 36 of the bottomed cylindrical casing 33.
A spacer 67 for supporting and fixing the
7, a permanent magnet 66 is arranged and these are integrated by a mold resin 85.

Further, in the DC brushless motor according to a third aspect of the present invention, a hole 87 is formed in the spacer 67, and the casing 3
3, through-holes 83 and 84 are formed in the rotor yoke 68 and the casing 33, which cover the outer peripheral surface of the mold 3, and the mold resin 85 is poured into the holes 87 and the through-holes 83 and 84. There is.

In the DC brushless motor according to the fourth aspect, the stator 12 is mounted on the fixed shaft 8 via the elastic body 9, and the hall element 71 is mounted on the drive circuit board 69 arranged close to the stator 12. And the stator 12 is covered with the mold resin 80, and these are integrated.

The DC brushless motor according to claim 5 is characterized in that a resin of high flame-retardant grade is used as the molding resin 80.

[0010]

According to the DC brushless motor of the first aspect, since the permanent magnet 66 and the casing 33 are integrated by the mold resin 85, the permanent magnet 66 can be securely fixed and the surface of the permanent magnet 66 can be secured. Since the molding resin 85 is coated, the permanent magnet 66 can be prevented from rusting.

According to the DC brushless motor of the second aspect, since the spacer 67 for supporting and fixing the permanent magnet 66 is integrated with the mold resin 85, the entire rotor 65 can be integrated and the permanent magnet 66 can be fixed. It can be further ensured.

According to the DC brushless motor of the third aspect, the permanent magnet is made by pouring the mold resin 85 from the hole 87 of the spacer 67 into the through holes 83 and 84 formed in the rotor yoke 68 and the casing 33. The spacer 67 for fixing 66, the rotor yoke 68, and the casing 33 are more firmly connected and fixed. Moreover, since the molding resin 85 is simply poured, the method is simple and the cost is low.

According to the DC brushless motor of the fourth aspect, when absorbing the cogging vibration, the drive circuit board 69 vibrates together with the stator 12, and the relative positional relationship between the two is kept constant. It is possible to prevent the control information from being lowered due to the positional deviation between the stator 71 and the stator 12. Further, since the winding 10 of the stator 12 and the drive circuit board 69 are covered with the molding resin 80, the water resistance thereof is also improved.

According to the DC brushless motor of the fifth aspect, when the mold resin 80 having a high flame-retardant grade is used as the mold resin 80, the elasticity is inferior, but the absorption of the cogging vibration is absorbed by the elastic body 9. In addition to being able to reduce noise, it is also flame-retardant, which further improves safety.

[0015]

EXAMPLES Specific examples of the DC brushless motor described above will be described in detail with reference to the drawings.

FIG. 1 shows a sectional view of the DC brushless motor of this embodiment, which is housed in the hub of the propeller fan of the outdoor unit as will be described later. In FIG. 1, reference numeral 1 denotes a mounting leg cover for mounting the present DC brushless motor on a key portion inside the outdoor unit. The mounting leg cover 1 is formed in a cylindrical shape with left and right penetrating as shown in FIG. There is. A mounting flange 3 having a mounting hole 2 is provided around one end of the mounting leg cover 1. A bottomed cylindrical end bracket 4 as shown in FIG. 3 is attached to the inside of the other end side of the mounting leg cover 1 with screws 5. A fixed shaft 8 is fixed to the bottom portion 6 of the end bracket 4 with a screw 7 at substantially the center thereof. A cylindrical anti-vibration rubber 9 is provided on the slightly proximal side of the fixed shaft 8.
Is attached, and the winding 10 is attached to the outer peripheral surface of the anti-vibration rubber 9.
An iron core 11 wound with is disposed. The stationary shaft 8, the iron core 11, the winding 10 and the like constitute a stator 12.

A bearing portion 32 is provided on the tip side of the fixed shaft 8, and the bearing portion 32 has two bearings.
The outer peripheral surface of one of the bearings 13 is provided with a substantially cylindrical bearing housing 15 as shown in FIG.
It is freely rotatable via. Bearing housing 1
A rubber bearing housing waterproof ring 16 as shown in FIG. 11 is mounted on the outer peripheral surface of the tip end 5 of FIG. As shown in FIG. 11, four protrusions 17 are provided inwardly on the inner peripheral surface of the bearing housing waterproof ring 16, and four drainage holes 18 are provided between the protrusions 17. I am doing it. The cylindrical portion 19 of the bearing housing 15 has eight holes 2 in the circumferential direction.
0 of the bearing housing waterproof ring 16 is inserted into and engaged with four of the holes 20. The holes 20 of the bearing housing waterproof ring 17 correspond to the holes 20 in which the projections 17 are not inserted. And communicate. Water that has entered the bearing housing 15 through the communicating holes 20 and 18 is discharged by centrifugal force due to rotation. Further, as shown in FIG. 5, a flange portion 21 is provided around one end of the bearing housing 15, and a plurality of mounting boss holes 22 are bored in the flange portion 21. Further, a through hole 23 for inserting the fixed shaft 8 is formed at the other end of the bearing housing 15.

The bearing housing waterproof cover 24, which covers the tip side of the bearing housing 15 and the bearing housing waterproof ring 16, is made of rubber and has a cylindrical shape as shown in FIG. An inner cylindrical portion 26 having a through hole 25 through which the fixed shaft 8 is inserted is integrally formed inward. The bearing housing waterproof cover 2
An inner end portion 27 of the bearing housing 4, which is open to the bearing housing 15 side, is formed slightly smaller than the inner diameter of the bearing housing waterproof cover 24 itself. Further, a water drain hole 28 is formed in the lower portion of the bearing housing waterproof cover 24. Here, the bearing housing waterproof cover 24 is fixed to the fixed shaft 8. The fixed shaft 8 is press-fitted into the through hole 25 of the inner cylindrical portion 26 of the bearing housing waterproof cover 24 to achieve watertightness, and the inner end portion 27 is mounted so as to cover the bearing housing waterproof ring 16 mounted on the bearing housing 15 as shown in FIG. That is, the bearing housing waterproof cover 2
The inner diameter of 4 is made larger than the outer diameter of the bearing housing 15, the inner end portion 27 is made slightly smaller than that, and the inner end portion 27 is made larger than the outer diameter of the bearing housing 15,
The size of the gap 29 (see FIG. 1) does not come into contact with the bearing housing waterproof cover 24 even when the bearing rotates. Further, these clearances 2 are provided between the inner peripheral surface of the inner end portion 27 and the outer peripheral surface of the bearing housing 15, and between the inner peripheral surface of the bearing housing waterproof cover 24 and the outer peripheral surface of the bearing housing waterproof ring 16.
The size of 9 is such that it is difficult for water to enter.

The bearing housing waterproof cover 24 mounted on the fixed shaft 8 is positioned and regulated by an E-shaped retaining ring 30, and the retaining ring 31 on the bearing 14 side moves the bearing portion 32 in the axial direction of the fixed shaft 8. Regulated. At the same time, the bearing 32
The bearing housing waterproof cover 24 serves to suppress the vibration of the bearing portion 32. The water that has entered the bearing housing waterproof cover 24 flows out through the water drain hole 28.

Here, the flange portion 2 of the bearing housing 15
The hub 35 of the propeller fan 34 is provided on the outer side surface of the rotor 1, and the bottom portion 3 of the rotor casing 33 is provided on the inner side surface of the flange portion 21.
6 and the bearing waterproof ring 37 are arranged, and the bolt 38
And the nut 39 together.
The rotor casing 33 is formed in a cylindrical shape with a bottom as shown in FIG. 4, and a cylindrical bearing press-fitting portion 40 for press-fitting into the outer peripheral surface of the bearing 14 is formed in the center of the bottom portion 36. There is. A plurality of holes 41 are formed in the bottom portion 36 of the rotor casing 33, and a plurality of through holes 42 for inserting the projections of the boss holes 22 of the bearing housing 15 and the bolts 38 are formed in the bottom portion 36. There is. Further, the axial dimension of the bearing press-fitting portion 40 of the rotor casing 33 is formed to be shorter than the axial dimension of the bearing 14 as shown in FIG.

As shown in FIG. 12, the bearing waterproof ring 37 is integrally provided with a collar portion 43 so as to be attached to the inner surface of the bottom portion 36 of the rotor casing 33.
A plurality of insertion holes 44 for inserting the bolts 38 are bored therethrough. The inner diameter of the cylindrical portion of the bearing waterproof ring 37 is shown by the diameter d ₁ in contact with the outer peripheral surface of the bearing press-fitting portion 40 of the rotor casing 33, the diameter d _{2 in} direct contact with the outer ring of the bearing 14, and FIGS. 1 and 13. The anti-vibration rubber retainer 45 has _three diameters d ₃ that cover the outer circumference thereof.

As shown in FIGS. 1 and 13, the anti-vibration rubber retainer 45 interposed between the retaining ring 31 and the anti-vibration rubber 9 has its outer peripheral portion 46 expanded toward the propeller fan 34 side. Is formed, and the outer peripheral portion 46 is the bearing waterproof ring 3
It is arranged so as to come inside the rib 47 (see FIG. 12) provided around the end of 7. As a result, the rotor casing 33
It is made difficult for the water that has penetrated into the bearing 14 to drip toward the bearing 14.

As shown in FIG. 8, the hub 35 of the propeller fan 34 has a hole 48 formed at the center thereof for inserting the bearing housing 15, and a plurality of holes 50 circumferentially formed near the other opening 49. Has been drilled. A plurality of projections 52 formed in the inner peripheral surface of the rubber fan waterproof ring 51 shown in FIG. 9 are inserted or press-fitted into the holes 50. By inserting the projections 52 into the holes 50, The fan waterproof ring 51 is attached to the periphery of the opening 49 of the hub 35. Holes 53 are formed between the projections 52 of the fan waterproof ring 51 at predetermined intervals, and the holes 53 correspond in position to the remaining holes 50 in which the projections 52 are inserted into the holes 50 of the hub 35. It is in communication. Thus hub 3
The holes 50 drilled in 5 are the projections 5 of the fan waterproof ring 51.
2 has a role of inserting and fixing the fan waterproof ring 51 and a role of expelling water that has entered the hub 35. Further, the projections 52 and the holes 53 of the fan waterproof ring 51 are alternately formed as shown in FIG. That is, in the fan waterproof ring 51, the fixing projections 52 and the water drain holes 53 are alternately arranged on the same circumference,
When the protrusion 52 is pushed into the hole 50 of the hub 35 of the propeller fan 34, the hole 53 between the protrusions 52 becomes a hole penetrating the hub 35 and the fan waterproof ring 51.

As shown in FIGS. 1 and 2, a rib 55 is provided around the outer peripheral edge of the opening 54 of the mounting leg cover 1 on the propeller fan 34 side. The outer diameter is slightly larger. The outer diameter of the rib 55 of the mounting leg cover 1 is set to be substantially the same as the inner diameter of the fan waterproof ring 51, as shown in FIG. 1, thereby reducing the intrusion of water.
Since the fan waterproof ring 51 is made of rubber, when the mounting leg cover 1 is assembled on the hub 35 side, even if the rib 55 of the mounting leg cover 1 hits the fan waterproof ring 51, the mounting leg cover 1 can be pushed into the rib 55 to remove the rib 55. The mounting leg cover 1 can be assembled on the hub 35 side by making the position inside the fan waterproof ring 51.

As shown in FIGS. 1 and 3, the end bracket 4 is formed in a cylindrical shape having a bottom portion 6 so that the end bracket 4 can be inserted and incorporated in the inner peripheral surface of the mounting leg cover 1 with almost no clearance. It has become. As shown in FIG.
An opening 56 into which the end of the fixed shaft 8 is inserted is formed in the center of the bottom portion 6 of the end bracket 4, and a hole 57 for inserting the screw 7 is formed around the opening 56. Further, the peripheral surface of the end bracket 4 near the bottom portion 6 has four screw holes 58 screwed into the screws 5. Furthermore, a rectangular mounting hole 59 is formed in the lower surface of the end bracket 4 in the circumferential direction, and a waterproof rubber bush 60 (see FIG. 17) is mounted in this mounting hole 59. Mounting hole 59 for mounting the waterproof rubber bush 60 of the end bracket 4
As shown in FIG. 2, similar mounting holes 61 are formed at the positions of the mounting leg cover 1 corresponding to the positions. 62
Is a hole for inserting the screw 5. The mounting holes 59 and 62 of the end bracket 4 and the mounting leg cover 1 are through holes that communicate with each other, and the mounting holes 59 and 62 are defined as the communicating through holes.
The waterproof rubber bush 60 is attached to. And FIG.
As shown in FIG. 7, the flange portions 6 on both sides of the waterproof rubber bush 60 are
The distance between 0a and 60b is the sum of the two thicknesses of the end bracket 4 and the mounting leg cover 1.

The lead wire 63 is pulled out by the waterproof rubber bush 60 so as to come to the lower surface of the end bracket 4 or the like in order to prevent water from entering, and the lead wire 63 is pulled out at the lead-out port. The above-mentioned waterproof rubber bush 60 is attached for the purpose of protection against scratches and reduction of water intrusion. As shown in FIG. 17, the waterproof rubber bush 60 is long in the circumferential direction and is provided with holes 64 for receiving the lead wires 63 one by one. In addition, a slit 6 is formed in the vertical direction so that the lead wire 63 can be easily drawn into the hole 64.
4a is cut. Further, the flange portion 60a entering the inside is formed smaller than the flange portion 60b coming to the outside so that the waterproof rubber bush 60 can be easily pushed into the mounting holes 59 and 61 from below.

In this embodiment, as described above, the waterproof mechanism including the bearing housing waterproof cover 24, the bearing housing waterproof ring 16, the bearing waterproof ring 37, the anti-vibration rubber retainer 45, the fan waterproof ring 51, the waterproof rubber bush 60, etc. Water is prevented from entering inside as much as possible. This prevents a decrease in reliability due to the intrusion of water. As a decrease in reliability due to the infiltration of water, the insulation is deteriorated electrically, mechanically the bearing 13 of the bearing portion 32,
Deterioration of 14 is a major factor affecting quality. In particular, in the bearings 13 and 14, the oil deteriorates due to moisture, and the lubrication effect decreases. Further, rust is generated on the race surface, which is the ball contact surface of the bearings 13 and 14, and abnormal noise is generated. Therefore, the electric motor (DC brushless motor) in the present embodiment is waterproof as described above, so that even if water is sprayed from all directions, it has a shape that prevents water from directly entering, and The water drain holes 28 and 50 are provided so that the invaded water can be swiftly expelled even when the water enters.

The rotor 65, which is integrally attached to the hub 35, is arranged on the rotor casing 33 and the inner peripheral surface of the rotor casing 33 via a spacer 67, as shown in FIG. The permanent magnet 66, the rotor yoke 68 mounted on the outer peripheral surface side of the rotor casing 33, and the like.

A drive circuit board 69 on which an electronic circuit for driving and controlling a DC brushless motor is mounted is formed in a disc shape as shown in FIGS. 1 and 14, and a fixed shaft 8 is provided at the center.
An opening 70 for inserting the hole is bored. The drive circuit board 69 has a Hall IC for detecting the rotation of the rotor 65.
Although 71 is mounted, in order to ensure the detection of the rotor 65, the Hall IC 71 needs to be deeper than the opening of the rotor 65 so that the magnetic flux of the permanent magnet 66 sufficiently passes through the Hall IC 71. . Moreover, the mounted Hall IC 71 can be well detected unless it is installed in parallel with the axis of the rotor 65. Therefore, the drive circuit board 69 is assembled in parallel with the side surface of the iron core 11 of the stator 12, and the Hall IC holder 72 is used to mount the Hall IC 71. FIG. 15 shows the Hall IC holder 72, in which the holes 73 into which the lead legs of the Hall IC 71 are inserted are long and three holes are obliquely formed.
The Hall IC 71 is inserted into the hole 73 of the Hall IC holder 72.
The Hall IC 71 is prevented from falling by inserting the lead leg of the. The Hall IC holder 72 is attached to the drive circuit board 69 by inserting the lead legs of the Hall IC 71 into which the Hall IC holder 72 is inserted into the three holes 74 near the outer periphery of the drive circuit board 69 shown in FIG. I am trying to attach it by soldering. Further, since the heights of the Hall IC holders 72 into which the Hall ICs 71 are inserted may be uneven due to the insertion, it is difficult to assemble the drive circuit board 69 in parallel with the iron core 11, and the board spacers 75 having the shape shown in FIG. I am trying to install it. That is, the cylindrical protrusion 76 protruding from one end of the square columnar substrate spacer 75 is inserted into the hole 77 provided on the circumference of the drive circuit substrate 69 shown in FIG. 14 where the Hall IC holder 72 is mounted, The drive circuit board 69 is assembled so as to be parallel to the iron core 11. Further, the end portion of the terminal 78 which is inserted into the iron core 11 and is connected to the winding 10 is inserted into the hole 79 (see FIG. 14) of the drive circuit board 69, and the terminal 78 and the pattern on the drive circuit board 69 side and soldering are performed. It is fixed at. Further, when the drive circuit board 69 is put in a molding die and tightened, the drive circuit board 69 is fixed at a normal position and resin-molded.

In this way, the stator 12 and the drive circuit board 69 are both resin-molded, and the molding resin 80 is used.
Are integrated in. As a result, the anti-vibration rubber 9 can sufficiently exhibit the cogging absorption effect. The shaded portion in FIG. 1 indicates the molding resin 80, but the vicinity of the hole containing the vibration-proof rubber 9 at the center of the iron core 11 is not molded. Therefore, the influence of uneven rotation due to cogging during operation is sucked in by the anti-vibration rubber 9, the transmission to the product main body incorporating the present DC brushless motor is small, and the product can be finished with less noise and vibration.

There are two types of terminals for connecting the ends of the winding 10; the longer terminal 78 and the shorter terminal 78a, and the longer terminal 78 is the drive circuit board 69 as described above.
An electric current output from a drive circuit IC (not shown) flows into the winding 10 by being inserted into the hole 79 and soldered to form a rotating magnetic field. Further, since the shorter terminal 78a corresponds to the neutral point of the stator winding 10, all terminals 78a are not connected to the drive circuit board 69 but are connected in a short-circuited manner to reduce the use area of the drive circuit board 69. , Is becoming smaller.

By the way, as a highly reliable measure for waterproofing, a method of molding all electrical and electronic components such as the winding 10 and the drive circuit board 69 with resin is often used. Further, as another effect of the resin mold, it is expected that the vibration of the component due to energization is suppressed and the noise is reduced. However, research has revealed that when molding is performed with the aim of reducing noise, the effect will not be obtained unless the molding material has elasticity to some extent. On the other hand, from the viewpoint of safety, it is required that the resin is a material having high flame retardancy. Since resin is originally a material that easily burns, it is mixed with an inorganic material such as quartz to make it flame-retardant.

Generally, a thermosetting resin such as an epoxy resin or a polyester resin is used as a resin for molding an electric motor. However, since these resins are not good as an elastic body, they are elastic to give elasticity. It is used by mixing high resin. That is, if the resin itself is to have elasticity, the flame-retardant grade has to be lowered, and thus there is concern about safety.

From the viewpoint of safety, UL9 is set as the flame retardant standard.
It is preferred to use 4V-O certified material. As an example, the low noise design resin molded products currently on the market are:
Low flame retardant grades such as UL94H-B are on the market. In the DC brushless motor of this embodiment, since the stator 12 that is a source of sound and vibration is attached to the fixed shaft 8 via the anti-vibration rubber 9, the vibration is transmitted to the main body. Moreover, the noise generated by the main body is absorbed by the anti-vibration rubber 9. Therefore, in this embodiment, the highest UL94V-O resin as a flame retardant grade can be used, and the electric motor is excellent in safety.

Further, since the stator 12 is supported by the fixed shaft 8 via the vibration-proof rubber 9, the drive circuit board 69 vibrating during operation is fixed to the fixed shaft 8. In this case, even if the relative position between the iron core 11 and the Hall IC 71 is assembled so that the efficiency is the highest, the movement of the iron core 11 causes the highest efficiency position in the vibration width to pass instantly, and most of the Is in an inefficient position, which results in an inefficient motor on average. However, in this embodiment, since the relative positions of the iron core 11 and the Hall IC 71 are integrated by molding with the molding resin 80, they are fixed at the position of maximum efficiency, and the operation is always performed at the position of maximum efficiency. . Further, in the present embodiment, the rotor 4 poles and the stator 6 poles are designed, and the position where the position of the Hall IC 71 is displaced from the center of the iron core 11 by 15 degrees (which varies in inverse proportion to the number of poles) is the highest efficiency. I'm confirming. Therefore, in this embodiment, since the stator 12 and the vibration circuit board 69 are integrally molded, the drive circuit board 69 moves integrally with the iron core 11, so that the relative angle is always at the position of maximum efficiency. It becomes an efficient DC brushless motor.

A rotor 65 is arranged on the outer periphery of the stator 12 so as to cover the stator 12. In the rotor 65, the rotor casing 33 and the hub 35, which are its constituent members, are integrally configured, and are rotatable by the bearing portion 32. Figure 7
Indicates a spacer 67 for supporting and fixing the permanent magnet 66 to the inner peripheral surface of the rotor casing 33, and a protrusion 81 protruding from the bottom surface of the ring-shaped spacer 67 is attached to the rotor casing 33. The spacer 67 is incorporated in the rotor casing 33 so as to be inserted into the hole 41 (see FIG. 4) formed in the bottom portion 36 of the rotor. Further, four substantially triangular magnet fixing pieces 82 are integrally formed on the spacer 67.
And a permanent magnet 66 having a substantially crescent-shaped cross section along the inner peripheral surface of the rotor 33.
Insert and place in between. The height of the magnet fixing piece 82 of the spacer 67 is lower than the height of the permanent magnet 66.

Next, FIG. 6 shows a rotor yoke 68 for covering the rotor casing 33, which is formed in a substantially cylindrical shape. After inserting the permanent magnet 66 into the inner peripheral surface of the rotor casing 33, the outer periphery of the rotor casing 33 is covered with the rotor yoke 68. At this time, the rotor yoke 68 is arranged so that the holes 83 formed in the peripheral surface of the rotor yoke 68 and the holes 84 formed in the peripheral surface of the rotor casing 33 are aligned and communicate with each other. Cover 33. The rotor 65 assembled in this manner is put in a molding die, and resin is poured and molded. Therefore, these rotors 65 are integrated by the molding resin 85.

Here, the resin is molded on the inner peripheral surface of the rotor casing 33 having an inner diameter obtained by subtracting the maximum thickness of the permanent magnet 66 from the inner peripheral surface thereof. Therefore, as shown in FIG. 7, since the upper portion of the magnet fixing piece 82 of the spacer 67 is lower than the height of the permanent magnet 66, this portion (the upper portion of the magnet fixing piece 82) is clogged with resin. Further, the resin flows into a vertical groove 86 having a semicircular cross section at the center of the inner surface of the magnet fixing piece 82 of the spacer 67, and the resin enters a hole 87 bored in the radial direction, and further the hole 87. To the hole 84 of the rotor casing 33 and the hole 83 of the rotor yoke 68, which are assembled in accordance with
The resin flows in from 7, and these are completely fixed by the hardening of the inflowing resin. That is, the entire surface of the permanent magnet 66 is thinly molded with the molding resin 85, and the spacer 6 for supporting and fixing the permanent magnet 66 is formed.
The resin flows in the radial direction of the rotor casing 33, the rotor casing 33, and the rotor yoke 68, and the resin is cured, thereby integrating them and ensuring the fixing of the permanent magnet 66. At the same time, the permanent magnet 6 is secured.
We are trying to prevent rusting on # 6.

[0039]

According to the DC brushless motor of the first aspect of the present invention, the permanent magnet and the casing are integrated by the mold resin, so that the permanent magnet can be securely fixed, and the mold resin is formed on the surface of the permanent magnet. Since it is covered, rust of the permanent magnet can be prevented.

According to the DC brushless motor of the second aspect, since the spacer 67 for supporting and fixing the permanent magnet is integrated with the molding resin, the whole rotor can be integrated and the fixing of the permanent magnet is further ensured. be able to.

According to the DC brushless motor of the third aspect, the mold resin is poured from the hole of the spacer into the through hole formed in the rotor yoke and the casing.
The spacer for fixing the permanent magnet, the rotor yoke, and the casing are more firmly connected and fixed. Moreover, since the molding resin is simply poured, the method is simple and the cost is low.

According to the DC brushless motor of the fourth aspect, when the cogging vibration is absorbed, the drive circuit board vibrates together with the stator, and the relative positional relationship between the two is kept constant, so that the Hall element and the fixed element are fixed. It is possible to prevent the control information from deteriorating due to the positional deviation from the child. Further, since the windings of the stator and the drive circuit board are covered with the mold resin, the water resistance thereof is also improved.

According to the DC brushless motor of the fifth aspect, when a mold resin having a high flame-retardant grade is used as the mold resin, the elasticity is inferior, but the absorption of the cogging vibration is absorbed by the elastic body, resulting in low noise. In addition to being possible to use, the safety is further improved due to flame retardancy.

[Brief description of drawings]

FIG. 1 is a sectional view of a DC brushless motor according to an embodiment of the present invention.

FIG. 2A is a plan view of a mounting leg cover according to an embodiment of the present invention. 2B is a sectional view taken along line AA of FIG. 2A of the embodiment of the present invention.

FIG. 3A is a plan view of an end bracket according to an embodiment of the present invention. FIG. 3B shows the embodiment of the present invention in FIG.
It is an AA sectional view of (a).

FIG. 4A is a plan view of a rotor casing according to an embodiment of the present invention. FIG. 4B shows an embodiment of the present invention in FIG.
It is an AA sectional view of (a).

FIG. 5A is a plan view of a bearing housing according to an embodiment of the present invention. FIG. 5B shows the embodiment of the present invention in FIG.
FIG.

FIG. 6A is a plan view of a rotor yoke according to an embodiment of the present invention. FIG. 6B is a sectional view taken along line AA of FIG. 6A of the embodiment of the present invention.

FIG. 7A is a plan view of a spacer according to an embodiment of the present invention. FIG. 7B is an A- of FIG. 7A of the embodiment of the present invention.
FIG. (C) is a figure which shows the principal part of the Example of this invention.

FIG. 8A is a plan view of the hub of the propeller fan according to the embodiment of the present invention. FIG. 8B shows the embodiment of the present invention in FIG.
It is an AA sectional view of (a).

FIG. 9A is a plan view of a fan waterproof ring according to an embodiment of the present invention. FIG. 9B shows the embodiment of the present invention in FIG.
It is an AA sectional view of (a). (C) is a bottom view of the fan waterproof ring of the embodiment of the present invention.

10 (a) is a sectional view taken along line AA of FIG. 10 (b) of the bearing housing prevention cover of the embodiment of the present invention.
(B) is a top view of the bearing housing prevention cover of the Example of this invention.

FIG. 11A is a plan view of a bearing housing waterproof ring according to an embodiment of the present invention. 11B is a sectional view taken along line AA of FIG. 11A of the embodiment of the present invention.

12 (a) is a sectional view taken along the line AA of FIG. 12 (b) of the bearing waterproof ring of the embodiment of the present invention. (B) is a top view of the bearing waterproof ring of the Example of this invention.

FIG. 13A is a plan view of an anti-vibration rubber holder according to an embodiment of the present invention. FIG. 13B is a diagram of the embodiment of the present invention.
It is an AA sectional view of (a).

FIG. 14 is a plan view of a drive circuit board according to an embodiment of the present invention.

FIG. 15A is a plan view of the Hall IC holder according to the embodiment of the present invention. (B) is a side view of the Hall IC holder of the embodiment of the present invention. (C) is a rear view of the Hall IC holder of the embodiment of the present invention. FIG. 15D is a sectional view taken along line AA of FIG. 15A of the embodiment of the present invention.

FIG. 16 (a) is a front view of a substrate spacer according to an embodiment of the present invention. (B) is a side view of the substrate spacer of the embodiment of the present invention. (C) is a rear view of the substrate spacer of the embodiment of the present invention.

FIG. 17A is a plan view of a waterproof rubber bush according to an embodiment of the present invention. (B) is a side view of the waterproof rubber bush of the embodiment of the present invention. (C) is sectional drawing of the waterproof rubber bush of the Example of this invention.

[Explanation of symbols]

 8 Fixed Shaft 9 Anti-Vibration Rubber (Elastic Body) 10 Winding 11 Iron Core 12 Stator 33 Rotor Casing 36 Bottom 65 Rotor 66 Permanent Magnet 67 Spacer 80 Mold Resin 83 Hole (Through Hole) 84 Hole (Through Hole) 85 Mold Resin 87 holes

Claims (5)

[Claims] 1. A stator (12) having an iron core (11) having a winding (10) wound around the outer circumference of a fixed shaft (8), and an outer peripheral surface of the iron core (11) of the stator (12). In a DC brushless motor having a rotor (65) including a corresponding permanent magnet (66) and a casing (33) supporting the permanent magnet (66), the permanent magnet (66) is molded resin (85). The permanent magnet (66) and the casing (33) are covered with the mold resin (85).
DC brushless motor characterized by integrating 2. A spacer (67) for supporting and fixing a permanent magnet (66) is arranged on a bottom portion (36) of a bottomed cylindrical casing (33), and the permanent magnet (66) is arranged on this spacer (67). 2. The DC brushless motor according to claim 1, wherein the mold resin (85) is integrated with each other. 3. A spacer (67) is provided with a hole (87), and a through hole (8) is formed in a rotor yoke (68) covering the outer peripheral surface of the casing (33) and the casing (33).
3) (84) is bored to form the hole (87) and the through hole (8).
3) The DC brushless motor according to claim 2, wherein the mold resin (85) is poured into (84). 4. A drive in which a stator (12) is mounted on a fixed shaft (8) via an elastic body (9), and a hall element (71) is mounted on the fixed shaft (8) so as to be arranged close to the stator (12). The circuit board (69) and the stator (12) are molded resin (8
The DC brushless motor according to claim 1, wherein the DC brushless motor is covered with 0) and these are integrated. 5. The DC brushless motor according to claim 4, wherein a resin having a high flame-retardant grade is used as the molding resin (80).