JPH0648382U - Brushless motor - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to provide an inner rotor type brushless motor using a permanent magnet for a rotor, which is easy to process and is easy to assemble. [Structure] The rotor 15 has a structure in which a core portion 16 and a magnet 17 are integrally fixed by a resin 18. The core portion 16 is a plate member 16 _-1 made of a magnetically permeable body that constitutes a yoke.
16 _-9 was laminated becomes, the inner peripheral portion of the plate member 16 _-1 to 16 _-9 1
6a is formed with a groove 16c, and a part of the groove 16c is made of resin 1
Bearing part 15 for holding the rotor 15 by filling with 8
The remaining groove portion 16c is formed as the engaging portion 15c with the output shaft 19 as well as b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

[Prior art]

FIG. 9 shows a block diagram of an example of a conventional brushless motor. In the figure, 1 indicates a stator portion. The stator portion 1 has an annular shape, and a plurality of magnetic fields are generated by winding the coil 1b around the yoke 1a, and the magnetic pole teeth 1c are used as magnetic poles to displace the magnetic poles by changing a signal to the coil 1b. , Rotate the rotor 2. A connection cord 4 is connected to the coil 1b via a connection portion 3, and a drive signal is supplied from the outside. The stator part 1 is fixed in the 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 _{- 1} 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 was adhered to the outer peripheral portion of the core 2a with an adhesive or the like, and the joint 2c was fixed to the inner peripheral portion of the core 2a by press fitting.

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

FIG. 12 shows a configuration diagram of the joint 2c. The joint 2c has a cylindrical shape, and the outer peripheral portion 2c_-1Is the inner peripheral portion 2a of the core 2a_-2It is fitted with and fixed by adhesion. Inner circumference 2c _-2 Is the shaft 5b of the cover member 5b_-1To hold the rotor 2 and to form a groove 2c formed on the upper portion thereof._-3Thus, the rotor 2 is engaged with the output shaft 6.

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

Further, conventionally, as shown in FIG. 14, instead of the ring magnet 2b, there is also a configuration in which four segment magnets 2d _{-1 to} 2d _-4 are adhered around the core 2a with an adhesive.

[0008]

[Problems to be solved by the device]

 However, in the conventional brushless motor, the yoke part has to be machined by casting or shaving, which requires time and labor, and the joint part with the output shaft has to be formed as a separate body. Therefore, there is a cost. Further, since the magnet is only bonded to the outer circumference of the yoke portion, there is a problem that the magnet may come off.

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

[0010]

[Means for Solving the Problems]

 The present invention relates to a brushless motor including a rotor having a magnet arranged on an outer peripheral portion, the center of which is engaged with an output shaft, and a stator which is arranged around the rotor and applies a driving magnetic field to the magnet. The rotor is formed by stacking a plurality of plate materials, and includes a core having a central hole in the center of which is formed an engaging portion with the output shaft, and the magnet is arranged on the outer periphery of the core. The core and the magnet are integrally sealed with resin.

[0011]

[Action]

 Since the magnet and the laminated core are integrally formed of resin, the magnet can be easily and surely held on the rotor.

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

Therefore, productivity can be improved.

[0014]

【Example】

 FIG. 1 shows a block diagram of a first embodiment of the present invention. In the figure, 11 indicates a stator. The stator 11 is composed of a plurality of coil portions 11a and a yoke portion 11b which are annularly arranged. The yoke portion 11b is formed by laminating plate materials made of a magnetic material, and the coil portion 11a is wound around the yoke portion 11b. The coil portion 11a is connected to the connection code 14 via the connection portion 13, and a drive signal is supplied from the outside.

The stator 11 is housed in the case 12 and fixed to the case 12. A rotor 15 is rotatably arranged on the inner peripheral portion of the stator 11. Case 12 is composed of the case member 12a and the cover member 12b, the case member 12a is formed a bearing portion 12a _-1 of the output shaft 19, the shaft 12b to the cover member 12b that rotatably hold the rotor 15 _{- 1} is planted.

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

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

The bearing portion 15b and the engaging portion 15c are formed on the inner peripheral portion 16a of the core portion 16 during resin molding.

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

Plate material 16_-1~ 16_-9Has an annular shape, and a groove portion 16b for engaging with an output shaft described later is formed in the inner peripheral portion 16a. Also, the plate material 16_-1~ 16_-9A protrusion 16d for positioning the magnet 17 is formed on the outer peripheral portion 16c. Furthermore, the plate material 16_-1The plate material 16_-2Round hole 16e for positioning with_-1Is formed. Plate material 16_-2~ 16_-9Positioning part 16e by press working_-2~ 16e _-9 Is formed. Positioning part 16e_-2~ 16e_-9Is the plate material 16_-2~ 16_-9One surface side projects 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. The plate members 16 _{-3 to} 16 _-9 are positioned similarly to the plate members 16 _-2 and 16 _-3 . As described above, the plate materials 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 both end surfaces 17b are configured to intersect each other at an angle of 90 °.

A taper portion 17c is formed on the inner peripheral side of both end surfaces 17b, and the taper portion 17c is engaged with the projecting portion 16d of the core portion 16 to form the outer peripheral portion 1 of the core portion 16. Positioned on 6c.

The magnets 17 _{-1 to} 17 _-4 are magnetized from the inner peripheral side toward the outer peripheral side. The magnets 17 _-1 , 17 _-3 and the magnets 17 _-2 , 17 _-4 are magnetized in opposite directions. As described above, according to the present embodiment, since the rotor 15 has the structure in which the core portion 16 and the magnet 17 are integrally fixed to each other with the resin 18, the magnet 17 and the core portion 16 can be easily and securely attached. Can be fixed.

Further, the core portion 16 is a plate material 16_-1~ 16_-9It is constructed by stacking _-1 ~ 16_-9Can be easily formed by pressing or the like. In this way, processing and assembly can be performed easily and reliably, which can improve productivity and reduce costs.

FIG. 5 shows a block diagram of a second embodiment of the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

This embodiment differs from the first embodiment in the structure of the rotor portion 25. FIG. 6 is a block diagram of the rotor of the 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 integrally fixed together with the resin 28. At this time, as in the first embodiment, the engaging portion 25c and the bearing portion 25b are integrally formed on the inner peripheral portion 26a of the core portion 26.

FIG. 7 shows a configuration diagram of the core portion 26. Similar to the first embodiment, the core portion 26 is formed by laminating thin steel plate members 26 _{-1 to} 26 _-9 made of a soft magnetic material such as an iron plate as shown in FIG. 7B. In this case, the plate member 26 _-1 to 26 _-9 is positioned by a circular hole 26 e _-1 and the engaging portion 26e _-2 ~26e _-9 formed similarly to the first embodiment. Further, a groove portion 26c for engaging with the output shaft is formed in the inner peripheral portion 26a. A part of the groove portion 26c is filled with the resin 28 to form a bearing portion 25b, and a part of the groove portion 26c remains to serve as an engaging portion 25c. However, in this embodiment, since the magnet 27 has a cylindrical shape, no protrusion 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 is different every 90 ° in the radial direction. The inner peripheral portion 27a of the magnet 27 is formed to have substantially the same diameter as the outer diameter of the core portion 26, engages with the outer peripheral portion 26b of the core portion 26, and is integrated with the core portion 26.

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

[0031]

[Effect of device]

 As described above, according to the present invention, the rotor and the laminated core are integrally resin-sealed, so that the magnet can be easily and surely held, and the laminated core presses the plate material. Since it can be formed by processing, it is easy to process, and it is easy to assemble, so it has the advantages of improving productivity.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a rotor unit according to a 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 a 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.

FIG. 5 is a configuration diagram of a second embodiment of the present invention, (A) is a plan view and (B) is a 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.

FIG. 9 is a configuration diagram of a conventional example, (A) is a plan view,
(B) is a sectional view.

FIG. 10 is a configuration diagram of a rotor portion of a conventional example, (A) is a plan view, and (B) is a 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 yoke portion, in which FIG. 12A is a plan view and FIG. 12B is a sectional view.

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

FIG. 14 is a block diagram of another example of a conventional rotor section,
(A) is a plan view and (B) is a sectional view.

[Explanation of symbols]

11 stator part 12 case 12a case member 12a _-1 bearing part 12b cover member 12b _-1 shaft 15 rotor 16 core part 16 _{-1 to} 16 _-9 plate material 16d protrusion part 17 magnet 18 resin 19 output shaft

Claims (1)

[Scope of utility model registration request] 1. A brushless motor comprising: a rotor having a magnet disposed on an outer peripheral portion thereof, the center of which is engaged with an output shaft; and a stator which is disposed around the rotor and applies a driving magnetic field to the magnet. The rotor is formed by stacking a plurality of plate materials, and includes a core having a central hole in which a engaging portion with the output shaft is formed in a central portion thereof, and the magnet is disposed on an outer periphery of the core, A brushless motor having a structure in which the core and the magnet are integrally sealed with resin.