JP2578470Y2 - Brushless motor - Google Patents

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 more particularly to an inner rotor type brushless motor using a permanent magnet for a rotor.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing an example of a conventional brushless motor. In the figure, reference numeral 1 denotes a stator unit. The stator portion 1 has an annular shape, and a plurality of magnetic fields are generated by winding a coil 1b around a yoke 1a. The magnetic pole teeth 1c are used as magnetic poles, and the magnetic poles are displaced by changing a signal to the coil 1b. Rotate 2. A connection cord 4 is connected to the coil 1b via the connection portion 3, and a drive signal is supplied from the outside. Stator unit 1 is fixed in storage case 5. Accommodating case 5 and more becomes case member 5a and the case member 5a and the cover member 5b is formed a bearing portion 5a _-1 for bearing the output shaft 6, the axis 5b on the cover member 5b for holding the rotor 2 rotatably _{- One} is planted.

FIG. 10 shows a configuration diagram of a conventional rotor 2.
The rotor 2 includes a core 2a, a ring magnet 2b, and a joint 2c. The ring magnet 2b is bonded to the outer periphery of the core 2a with an adhesive or the like, and the joint 2c is fixed to the inner periphery of the core 2a by press fitting.

FIG. 11 shows the configuration of the core 2a. Core 2
“a” was formed by cutting into a substantially cylindrical shape as shown in FIG. A magnet ring 2b is fixed to an outer peripheral portion 2a- ₁ of the core 2a, and a joint 2 is fixed to an inner peripheral portion 2a _- 2.
c is fixed.

[0005] Fig. 12 shows a configuration diagram of the joint 2c.
The joint 2c has a cylindrical shape, and the outer peripheral portion 2c- ₁ is fitted to the inner peripheral portion 2a- ₂ of the core 2a and is fixed by bonding. The inner peripheral portion 2c- ₂ is engaged with the shaft 5b- ₁ of the cover member 5b,
, And the rotor 2 is engaged with the output shaft 6 by the groove 2c- ₃ formed on the upper portion.

FIG. 13 shows a configuration diagram of the output shaft 6. The output shaft 6 is rotatably held by the bearing 5a- ₁ of the case member 5a and has a pin 6a at one end. The pin 6a engages with the groove 2c- _{3 of the} joint 2c and is connected to the rotor 2,
It rotates according to the rotation of the rotor 2. A groove 6b is formed at the other end of the output shaft 6 so as to engage with the outside.

In the prior art, four segment magnets 2d are used instead of ring magnets 2b as shown in FIG.
_{In some} cases, _{-1 to} 2d _-4 are adhered to the periphery of the core 2a with an adhesive.

[0008]

However, in the conventional brushless motor, the yoke portion must be machined by casting or shaving, which requires time and effort and requires the joint portion with the output shaft to be formed separately. This requires poor assemblability and therefore costs. In addition, since the magnet is only adhered to the outer periphery of the yoke, there is a problem that the magnet may come off.

The present invention has been made in view of the above points, and has as its object to provide a brushless motor which is easy to process and has good assemblability.

[0010]

According to the present invention, a magnet is provided on an outer peripheral portion, and a center of the magnet is arranged on an output shaft, and a rotor is arranged around the rotor to apply a driving magnetic field to the magnet. in the brushless motor having a stator, wherein the rotor is formed by laminating a plurality of plates, comprising a core having a center hole in which an engagement portion is formed with the output shaft at the center thereof, the front SL core The magnet is arranged on the outer periphery, and the output shaft of the center hole of the core is engaged.
While maintaining the shape of the engaging part of the part to be
The core and the magnet are integrally sealed with a resin so as to form a bearing portion having a shape .

[0011]

According to the present invention, since the magnet and the laminated core are integrally formed of resin, the magnet can be easily and reliably held on the rotor. Further, since the laminated core can be formed by pressing and laminating plate materials, the assemblability is easy and the processing of the center hole and the like can be easily performed. Furthermore, the core and magnet are made of resin
During sealing, the output shaft of the center hole of the core is
While maintaining the shape of the engaging part of the part to be
By forming a bearing part, a fixed shaft is supported on the core.
Bearing unit for engaging the output shaft with the bearing unit for
Since it can be formed, processing of the bearing part and the engaging part
Need to be performed separately. Therefore, productivity can be improved.

Further, since the laminated core can be formed by pressing and laminating plate materials, the assemblability is easy and the processing of the center hole and the like can be easily performed.

Therefore, productivity can be improved.

[0014]

FIG. 1 is a block diagram showing a first embodiment of the present invention.
In the figure, reference numeral 11 denotes a stator. The stator 11 includes a plurality of coil portions 11a and a plurality of yoke portions 11b arranged in an annular shape.
Consisting of The yoke portion 11b is formed by laminating plate members made of a magnetic material, and the coil portion 11a is wound around the yoke portion 11b. The coil part 11a is connected to the connection cord 14 via the connection part 13, and a drive signal is supplied from the outside.

The stator 11 is housed in a case 12,
It is fixed to the case 12. A rotor 15 is rotatably disposed on an inner peripheral portion of the stator 11. The case 12 includes a case member 12a and a cover member 12b. The case member 12a has a bearing 12a- _{1 for the} output shaft 19, and the cover member 12b has a shaft 12b- ₁ for rotatably holding the rotor 15. It is planted.

FIG. 2 shows a configuration diagram of the rotor 15. The rotor 15 mainly includes a core 16 and magnets 17 _{-1 to} 17 _-4.
Consisting of

The magnets 17 _{-1 to} 17 _-4 and the core 16 are molded with a resin and fixed integrally with a resin 18.

At the time of resin molding, the inner peripheral portion 1 of the core portion 16 is formed.
A bearing 15b and an engaging portion 15c are formed in 6a.

FIG. 3 shows a configuration diagram of the core section 16. The core portion 16 has a planar shape as shown in FIG. 3A, and a thin steel plate material (hereinafter simply referred to as a plate material) 16 _{-1 to} 16 _-9 made of a soft magnetic material such as an iron plate is shown in FIG. As shown in B), a plurality of sheets are laminated and fixed.

Each of the plate members 16 _{-1 to} 16 _-9 has an annular shape, and a groove 1 for engaging with an output shaft described later is formed in an inner peripheral portion 16a thereof.
6b are formed. Also, a projection 1 for positioning the magnet 17 is provided on the outer peripheral portion 16c of the plate members 16 _{-1 to} 16 _-9.
6d are formed. Furthermore, plate material to the plate material 16 _-1 1
_6-2 round hole 16e _-1 for positioning and is formed. The plate member 16 _-2 to 16 _-9 positioning portion 16e _-2 ～16E _-9 is formed by pressing. Positioning unit 16
In e _{-2 to} 16e _-9 , one surface side of the plate material 16 _{-2 to} 16 _-9 protrudes to form a convex portion, and the other surface side forms a concave portion.

The convex portion of the plate member 16 _-2 positioning portion 16e _-2 engages the circular hole 16e _-1 of the plate material 16 _-1, positioning of the plate member 16 ₁ and the plate member 16 _-2 is performed. Plate 16 convex portions in a recess formed on the other surface are formed on one surface of the positioning portion 16e _-3 of the plate material 16 _-3 positioning portion 16e _{-2 -2} engages, plate 16 _-2 and plate 16 _- Positioning with ₃ is performed. Plate 16 _-3 to 16 _-9 is positioned similarly to plate 16 _-2 and plate 16 _-3. As described above, the plate members 16 _{-1 to} 16 _-9 are integrally laminated.

FIG. 4 shows a configuration diagram of one magnet 17. The inner peripheral portion 17a has a peripheral ratio that engages with the outer peripheral shape of the core portion 16, and the both end surfaces 17b are configured to cross each other at an angle of 90 °.

Further, a tapered portion 17c is formed on the inner peripheral side of both end faces 17b. The tapered portion 17c is engaged with the projecting portion 16d of the core portion 16 to form an upper portion on the outer peripheral portion 16c of the core portion 16. Is positioned.

The magnets 17 _{-1 to} 17 _-4 are magnetized from the inner peripheral side to the outer peripheral side. The magnets 17 _-1 and 17 _-3 and the magnets 17 _-2 and 17 _-4 are magnetized in opposite directions. As described above, according to the present embodiment, since the rotor 15 has the configuration in which the core 16 and the magnet 17 are integrally fixed by the resin 18, the magnet 17 is easily and reliably fixed to the core 16. it can.

The core portion 16 is formed by laminating plate materials 16 _{-1 to} 16 _-9 , and the plate materials 16 _{-1 to} 16 _-9 can be easily formed by press working or the like. As described above, since processing and assembly can be performed easily and reliably, productivity can be improved and costs can be reduced.

FIG. 5 is a block diagram showing a second embodiment of the present invention. In the figure, the same components as those in FIG.
The description is omitted.

This embodiment is different from the first embodiment in the configuration of the rotor section 25. FIG. 6 shows a configuration diagram of a rotor according to a second embodiment of the present invention. The rotor 25 is formed by resin-molding the core portion 26 and the magnet 27 as in the first embodiment, and is integrally fixed together with the resin 28. At this time, similarly to the first embodiment, the engagement portion 25c and the bearing portion 25 are provided on the inner peripheral portion 26a of the core portion 26.
b is formed integrally.

FIG. 7 shows a configuration diagram of the core section 26. As in the first embodiment, the core 26 is formed by laminating thin steel plates 26 _{-1 to} 26 _-9 made of a soft magnetic material such as an iron plate as shown in FIG. 7B. At this time, the plate members 26 _{-1 to} 26 _-9 have round holes 26e _-1 and engaging portions 26e _-2 , formed in the same manner as in the first embodiment.
26e- ₉ . A groove 26c for engagement with the output shaft is formed in the inner peripheral portion 26a. Groove 2
6c is partially filled with a resin 28, and a bearing 25
b, and a part is left to form the engaging portion 25c. However, in this embodiment, since the magnet 27 has a cylindrical shape, no projection is formed on the outer peripheral portion 26b.

FIG. 8 shows a configuration diagram of the magnet 27. The magnet 27 has a cylindrical shape and is magnetized so that the magnetizing direction differs every 90 degrees in the radial direction. Magnet 2
The inner peripheral portion 27a of the core 7 has substantially the same diameter as the outer diameter of the core portion 26, and is engaged with the outer peripheral portion 26b of the core portion 26 to be integrated with the core portion 26.

With the above configuration, the same effects as in the first embodiment can be obtained, and unlike the first embodiment, the magnet 26 is formed integrally, so that the assemblability can be further improved as compared with the first embodiment.

[0031]

As described above, according to the present invention, the rotor is formed by integrally sealing the magnet and the laminated core with resin, so that the magnet can be easily and securely held.
The laminated core can be formed by pressing a plate material, both assemblability the machining Ru facilitates der even Ri good der further core and Ma
When the gnet is sealed with resin, the core
Maintains the shape of the engaging part where the output shaft of the center hole is engaged
While forming a cylindrical bearing in the center hole
The bearing part and the output shaft for bearing the fixed shaft on the core
The engaging portion to be engaged can be formed integrally, and the bearing portion
In addition, since there is no need to separately process the engaging portion, there is a feature that productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, wherein (A) is a plan view and (B) is a cross-sectional view.

FIG. 2 is a configuration diagram of a rotor unit according to the first embodiment of the present invention;
(A) is a plan view and (B) is a sectional view.

FIG. 3 is a configuration diagram of a yoke according to the first embodiment of the present invention;
(A) is a plan view and (B) is a sectional view.

FIG. 4 is a configuration diagram of a magnet according to a first embodiment of the present invention;
(A) is a plan view and (B) is a side view.

5A and 5B are configuration diagrams of a second embodiment of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a cross-sectional view.

FIG. 6 is a configuration diagram of a rotor unit according to a second embodiment of the present invention;
(A) is a plan view and (B) is a sectional view.

FIG. 7 is a configuration diagram of a yoke according to a second embodiment of the present invention;
(A) is a plan view and (B) is a sectional view.

FIG. 8 is a configuration diagram of a magnet according to a second embodiment of the present invention;
(A) is a plan view and (B) is a sectional view.

9A and 9B are configuration diagrams of an example of a related art, in which FIG.
(B) is a sectional view.

10A and 10B are configuration diagrams of an example of a conventional rotor unit, where FIG. 10A is a plan view and FIG. 10B is a cross-sectional view.

FIG. 11 is a configuration diagram of a joint portion of a conventional example.
(A) is a plan view and (B) is a half sectional view.

12A and 12B are configuration diagrams of a conventional example of a yoke portion, where FIG. 12A is a plan view and FIG. 12B is a cross-sectional view.

FIG. 13 is a configuration diagram of an output shaft according to a conventional example.

FIG. 14 is a configuration diagram of another example of a conventional rotor unit;
(A) is a plan view and (B) is a sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Stator part 12 Case 12a Case member 12a- ₁ Bearing part 12b Cover member 12b _-1 axis 15 Rotor 16 Core part 16 _{-1 to} 16 _-9 Plate material 16d Projection part 17 Magnet 18 Resin 19 Output shaft

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 29/00-29/14 H02K 1/17 H02K 1/27 H02K 15/03

Claims (1)

(57) [Scope of request for utility model registration] 1. A brushless motor having a magnet disposed on an outer peripheral portion, a center of which is engaged with an output shaft, and a stator disposed around the rotor and applying a driving magnetic field to the magnet. the rotor is formed by laminating a plurality of plates, comprising a core having a center hole in which an engagement portion is formed with the output shaft at the center thereof, said magnet is disposed on the outer periphery of the front SL core , And said
A part of the center hole of the core where the output shaft is engaged
A cylindrical bearing portion is formed in the center hole while retaining the shape.
A brushless motor having a configuration in which the core and the magnet are integrally sealed with a resin as described above.