JPH1198761A - Brushless vibrating motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brushless vibrating motor with a good characteristic wherein the leakage magnetic fluxes generated from its driving magnets are reduced. SOLUTION: In this vibrating motor, a stator 1 has a plurality of coils 2, and a rotor 8 has drive magnets 9 provided opposite via an air gap to the coils 2 and has a rotor frame 10 made of a magnetic material, which holds the drive magnets 9 and has in one portion of its outer periphery a flange 10a folded in the direction of its top surface. By making such a configuration, since the leakage magnetic fluxes generated from the drive magnets 9 can be reduced and the magnetic reluctance of a brushless vibrating motor can be made small uniformly, so that one with no characteristic deterioration is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless vibration motor used for information equipment, communication equipment and the like.

[0002]

2. Description of the Related Art Conventionally, a brushless vibration motor described in Japanese Patent Application Laid-Open No. H4-222944 is known. FIG. 5 shows a sectional view of a conventional brushless vibration motor. 5, a stator 1 has a plurality of coils 2 disposed on a base 3 formed of an iron substrate or the like, and a housing 7 in which a bearing 4, a thrust plate 5 and a bottom plate 6 are mounted in the center of the base 3. Is fixed. On the other hand, the rotor 8 holds a driving magnet 9 disposed in the coil 2 of the stator 1 via a gap and the driving magnet 9 by bonding or the like, and a part of the iron is cut away. The rotor frame 10 is configured by fitting a rotating shaft 11 at the center, and the bearing 4 rotatably supports the rotating shaft 11. The brushless vibration motor is configured as described above.

FIG. 6 shows a top view of the rotor 8. In FIG. 6, reference numeral 10b denotes a chipped portion, which is formed by cutting out a part of the rotor frame 10, which is a member of the rotor 8. With the above configuration, the rotor 8 is rotated to generate vibration.

[0004]

However, in the above-described conventional configuration, the rotor frame 1 on the driving magnet 9 is not provided.
Since the part 10b is cut off to form a part 10b, the magnetic shielding of the part 10b is not performed, and a leakage magnetic flux is generated by rotating the drive magnet 9 to use it. Affects equipment.

[0005] In addition, since a part of the rotor frame 10 on the driving magnet 9 which is notched has a chipped portion 10b, the magnetic resistance of the magnet generated from the driving magnet 9 becomes larger than that of the other parts. There was a problem that the characteristics of the motor deteriorated.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. A brushless vibration motor that can obtain vibration without requiring a separate component for generating vibration, generates a small leakage magnetic flux, and does not deteriorate characteristics. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a brushless vibration motor in which a flange is provided on a part of an outer periphery of a rotor frame.

The brushless vibration motor according to the second aspect of the present invention is configured to use a rotary bearing having an asymmetric shape with respect to a fixed shaft fixed to a stator.

Thus, vibration can be obtained without the need for a separate component for generating vibration, and there is no need to cut out the rotor frame, so that leakage magnetic flux generated from the driving magnet can be reduced, and the magnetic field can be reduced. It is possible to provide a brushless vibration motor whose resistance can be reduced uniformly and whose characteristics do not deteriorate.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is directed to a stator having a plurality of coils, and a drive supported by a rotatable rotor frame and disposed in the coils via a gap. A rotor having a magnet for use, wherein a flange is formed on a part of the outer periphery of the rotor frame so that the center of gravity of the rotor is shifted from the center of rotation of the rotor. Therefore, vibration can be obtained without the need for a separate component for generating vibration, and it is not necessary to cut out the rotor frame as in the conventional example shown in FIGS. Since the leakage magnetic flux can be reduced and the magnetic resistance can be reduced uniformly, a brushless vibration motor whose characteristics do not deteriorate can be provided.

According to a second aspect of the present invention, there is provided a stator having a plurality of coils, and a driving magnet supported by a rotatable rotor frame and provided with a gap in the coils. With a rotor,
A rotary bearing rotatably fitted to a fixed shaft fixed to the stator is fixed to the rotor frame, and the rotary bearing has an asymmetric shape with respect to the fixed shaft and shifts the center of gravity of the rotor from the center of rotation of the rotor. Position. Therefore, vibration can be obtained without requiring a separate component for generating vibration, and since there is no need to cut out the rotor frame, it is possible to reduce the leakage magnetic flux generated from the driving magnet and to reduce the magnetic resistance. Can be reduced uniformly, so that a brushless vibration motor whose characteristics do not deteriorate can be provided.

[0012]

【Example】

(Embodiment 1) An embodiment of the present invention described in claim 1 of the present invention will be described below with reference to the drawings. In FIG. 1, a plurality of coils 2, a base 3, a bearing 4, a thrust plate 5, a bottom plate 6, and a housing 7 constituting the stator 1 are the same as those in the conventional example shown in FIG. On the other hand, the rotor 8 is provided with a driving magnet 9 disposed in the coil 2 of the stator 1 via a gap, and a flange 10a on a part of the outer periphery of the driving magnet 9 held by bonding or the like, and A rotor frame 10 made of a magnetic material whose flange 10a is folded up in the direction of the top surface of the rotor 8 has a rotating shaft 1 at the center.
1, and the bearing 4 rotatably supports the rotating shaft 11. The brushless vibration motor is configured as described above.

FIG. 2 shows a top view of the rotor 8. In FIG. 2, a flange 10 a is provided on a part of the outer periphery of the rotor frame 10 and is folded back toward the top surface of the rotor 8 so that the center of gravity of the rotor 8 is rotated by the flange 10 a Therefore, when the rotor 8 is rotated, vibration is generated.

According to the above configuration, the vibration can be obtained without requiring a separate component for generating the vibration, and the vibration can be generated without cutting off a part of the rotor frame. It is possible to provide a brushless vibration motor that can reduce the generated leakage magnetic flux, can uniformly reduce the magnetic resistance of the magnetism generated from the driving magnet 9, and do not deteriorate the characteristics.

In this embodiment, the flange 10a is folded in the direction of the top surface of the rotor 8. However, even if the flange 10a is not folded, the generated vibration is reduced, but the center of rotation of the rotor 8 and the center of gravity of the rotor 8 are partially reduced. The effect can be obtained only by providing a flange that functions to shift the position.

(Embodiment 2) An embodiment of the invention described in claim 2 will be described below with reference to the drawings.

Referring to FIG. 3, a stator 1 includes a plurality of coils 2 disposed on a base 3 formed of an iron substrate or the like, and a fixed shaft 12 held by the base 3 near the center of the base 3. I have. On the other hand, the rotor 8 is
A rotor frame 1 holding a driving magnet 9 disposed in the coil 2 through a gap and a rotary bearing 13 having an asymmetric shape with respect to the fixed shaft 12 by bonding or the like.
0. The brushless vibration motor is configured as described above.

FIG. 4 is a rear view of the rotor 8. 4, the rotary bearing 13 has an asymmetric shape with respect to the fixed shaft 12 shown in FIG.
3b, the position of the center of gravity of the rotor 8 is shifted from the center of rotation of the rotor 8, and the rotation of the rotor 8 causes vibration.

With the above structure, vibration can be obtained without requiring a separate component for generating vibration, and vibration can be generated without cutting out a part of the rotor frame. The present invention can provide a brushless vibration motor in which the magnetic flux generated by the driving magnet can be reduced, and the magnetic resistance generated by the driving magnet can be reduced uniformly.

[0020]

As is apparent from the above description, claim 1
According to the invention described in claim 2 and the invention described in claim 2, vibration can be obtained without requiring separate parts for generating vibration, and vibration can be generated without cutting out a part of the rotor frame. Therefore, it is possible to reduce the leakage magnetic flux generated from the driving magnet, to uniformly reduce the magnetic resistance of the magnetism generated from the driving magnet, and to provide a brushless vibration motor whose characteristics are not deteriorated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a brushless vibration motor according to a first embodiment of the present invention.

FIG. 2 is a top view of a rotor of the brushless vibration motor.

FIG. 3 is a sectional view of a main part of a motor of a brushless vibration motor according to a second embodiment of the present invention.

FIG. 4 is a rear view of the rotor of the brushless vibration motor.

FIG. 5 is a sectional view of a main part of a conventional brushless vibration motor.

FIG. 6 is a top view of the rotor of the brushless vibration motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Coil 3 Base 4 Bearing 5 Thrust plate 6 Bottom plate 7 Housing 8 Rotor 9 Driving magnet 10 Rotor frame 10a Flange 10b Chipped part 11 Rotation shaft 12 Fixed shaft 13 Rotation bearing 13a Small weight part 13b Large weight part

Claims (2)

[Claims] 1. A rotor frame comprising: a stator having a plurality of coils; and a rotor supported by a rotatable rotor frame and having a driving magnet disposed in the coils with a gap therebetween. A brushless vibration motor characterized in that a flange is formed on a part of the outer periphery of the rotor to shift the center of gravity of the rotor from the center of rotation of the rotor. 2. A stator comprising: a stator having a plurality of coils; and a rotor supported by a rotatable rotor frame and having a driving magnet disposed in the coils with an air gap therebetween. A rotating bearing rotatably fitted to the fixed shaft is fixed to the rotor frame, and the rotating bearing is formed asymmetrically with respect to the fixed shaft so that the center of gravity of the rotor is shifted from the center of rotation of the rotor. A brushless vibration motor characterized in that: