JP2002248428A - Vibration type brush-less motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration type brush-less motor capable of arbitually setting the vibration degree without increasing a cost and numbers of the processes. SOLUTION: The vibration type brush-less motor A has a structure of an axial gap type brush-less motor and comprises a rotor yoke 1 to which a magnet 2 is fixed, a shaft 3 whose one end 3a is fixed in the rotation center of type rotor yoke, a rotor 8 whose bearing part 6 is journalled in the other end 3b of the shaft 3 in a freely rotatable manner, a plurality of air-core coils 5 arranged circularly in the surrounding of the bearing part 6, and a plurality of arc-like magnets 2 installed on the opposite to the air-core coils 5 and formed by radially cut in the direction from the rotation center of the rotor yoke 1 to the outer circumferential and the motor generates vibration by unbalanced rotation of the rotor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type brushless motor having an axial gap type brushless motor structure used as a vibration source of a pager, a cellular phone, etc., which has been rapidly increasing in recent years. It is related to the structure of.

[0002]

2. Description of the Related Art FIGS. 9 to 12 are structural views of a conventional vibration type motor. FIG. 9 shows a structure of a vibration type motor in which an unbalance weight (weight) 9 is attached to a shaft 3 and a vibration is generated by rotation of the shaft 3 as described in Japanese Utility Model Laid-Open No. 7-20063. FIG.
FIG. 10 shows JP-A-9-93862 and JP-A-2000-262.
FIG. 1 is a diagram showing a structure of a vibration type motor in which an unbalanced weight 9 is attached to an outer periphery of a rotor 8 and a vibration is generated by rotation of the rotor 8 as described in each of Japanese Patent No. 969.

FIG. 11 and FIG.
7853 and Japanese Patent Application Laid-Open No. 9-294352, the weight 11 is disposed at a portion where the flat coil 10 is partially removed or the flat coil is deleted, and vibration is applied to the rotation of the rotor. FIG. 4 is a view showing a structure of a flat coil of a vibration type motor that generates a vibration.

[0004]

SUMMARY OF THE INVENTION The aforementioned Japanese Utility Model Laid-Open Publication No. 7-2.
0063, JP-A-9-93862, JP-A-2000-2
The vibration type motor described in each of Japanese Patent No. 62969 has a structure in which an unbalanced weight must be attached to a shaft. Therefore, in addition to the cost of the basic parts as the motor itself, the cost for the unbalance weight increases, and the man-hour for attaching the unbalance weight to the shaft also increases. Further, since a rotating space for rotating the unbalance weight is required outside or inside the motor itself, the vibration type motor having such a structure cannot be downsized.

The vibration type motors described in the above-mentioned JP-A-2-17853 and JP-A-9-294352 have a structure in which a flat coil is movable.
A large vibration effect could not be obtained.

Accordingly, the present invention has been made in view of such problems, and is a vibration type brushless motor having the structure of an axial gap type brushless motor. And a rotor having the other end of the shaft rotatably supported by a bearing portion, a plurality of air-core coils arranged annularly around the bearing portion, and a plurality of air-core coils opposed to the plurality of air-core coils. And the circular arc-shaped magnet cut out radially or semi-circularly from the rotation center of the rotor yoke having a ceiling portion toward the outer peripheral direction, or the disc-shaped magnet cut out of a part thereof. Since the magnet is provided, there is no need to add components required for forming a vibration, so that cost and man-hours are not increased, and vibration is not caused. And to provide a vibration type brushless motor it is possible to increase the effect.

[0007]

In order to solve the above-mentioned problems, the present invention provides a vibration type brushless motor having the following constitutions (1) to (4). (1) As shown in FIGS. 1 to 4 and FIG. 7, vibration type brushless motors A, B, and E having an axial gap type brushless motor
One end 3a of the shaft 3 is fixed to the rotation center of the rotor yokes 1, 1A, 1D to which the shafts A, 2D are fixed.
8 having the other end 3b rotatably supported by a bearing 6
And a plurality of air-core coils 5 arranged annularly around the bearing device 6, and the rotor yoke 1 provided to face the plurality of air-core coils 5 and having a ceiling (ceiling surface) 1 a , 1A, and 1D, the magnets 2 and 2D each have a circular or semi-circular shape and are cut out radially or semi-circularly from the rotation center of the rotation center, or a disk-shaped magnet 2A that has a portion cut away. A vibration type brushless motor, wherein vibration is generated by unbalanced rotation of the rotor 8. (2) The vibration type brushless motor F according to claim 1, wherein the ceiling 1a is cut radially from the rotation center of the rotor yoke 1E toward the outer periphery as shown in FIG. . (3) As shown in FIG. 5, a vibration type brushless motor C having the structure of an axial gap type brushless motor, wherein a shaft 3 is provided at a rotation center of rotor yokes 1, 1A, 1D to which magnets 2, 2A, 2D are fixed. A rotor 8 having one end 3a fixed thereto and the other end 3b of the shaft 3 rotatably supported by a bearing 6; a plurality of air-core coils 5 arranged annularly around the bearing device 6; The rotor yoke 1B having a ceiling (ceiling surface) 1a disposed so as to face the plurality of air core coils 5 has a center 16 displaced with respect to the rotation center 14 of the rotor yoke 1B, and surrounds the rotation center 14. Substantially circular hollow portion 15 provided as follows
And the hollow portion 1 with respect to the rotation center 14 of the rotor yoke 1B.
A vibration type brushless motor, wherein vibration is generated by unbalanced rotation of the rotor 8 generated by displacement of the center 16 of the motor 5. (4) The magnets 2, 2A to 2C are characterized in that 2N (N is a positive number) sets of N poles and S poles are magnetized on all or a part (in the case shown in FIG. 6) of the magnets. The vibration type brushless motor according to any one of claims 1 to 3.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to sixth embodiments of a vibration type brushless motor according to the present invention will be described in order with reference to FIGS. FIG. 1 is a top view showing a motor according to a first embodiment of the present invention, and FIG.
3 is a longitudinal sectional view taken along the line AA of FIG. 1, FIGS. 3 to 5 are bottom views of the rotors of the motors according to the first to third embodiments of the present invention, and FIG. FIG. 7 is a bottom view and a side view of a rotor according to a fifth embodiment of the present invention, and FIG. 8 is a top view of a motor according to a sixth embodiment of the present invention.

In the vibration type brushless motor of each embodiment described below, the magnetized poles of the rotor are provided at an angle corresponding to 4 poles on the entire circumference by three-phase drive, and an air-core coil having an opening angle of 90 ° is provided with 120 air-core coils.
This is an axial gap type brushless motor provided at an interval of °. 1 to 8, 1, 1A to 1E are rotor yokes, 1a is a ceiling surface (ceiling portion), 1b is a side surface,
2A to 2E are magnets, 3 is a shaft, 3a is one end,
3b is the other end, 4 is a printed circuit board, 5 is an air-core coil, 6 is a bearing device (bearing portion), 7 is a plate, 8 is a rotor, and A to
F is a vibration type brushless motor.

[First Embodiment] In a vibration type brushless motor A according to a first embodiment of the present invention, the other end 3b of a shaft 3 is provided at the center of rotation of a rotor yoke 1 as shown in FIGS. One end 3 a of the shaft 3 is fixed and is rotatably held by a bearing device 6. An arc-shaped magnet 2 fixed to a rotor yoke 1 having a ceiling surface 1a and a side surface 1b and radially cut away from the center of rotation toward the outer periphery is formed by a plurality of air cores mounted on a printed circuit board 4. It is arranged so as to face the coil 5.

The bearing device 6 is a sintered oil-impregnated bearing, which is formed by caulking a plate 7 made of a magnetic material forming a magnetic circuit at its lower end.
The shaft 3 fixed to the rotor yoke 1 is rotatably held. A printed circuit board 4 is attached to the upper surface of the plate 7, and a plurality of air-core coils 5 are attached to the upper surface of the printed circuit board 4 with an adhesive. The arc-shaped magnet 2 is magnetized so as to have N poles and S poles alternately two poles and four poles on the circumference. In this embodiment, since the magnet 2 is provided in an arc shape, four magnetic poles are provided.
Here, a rotational driving force is generated by energizing the plurality of air core coils 5. At this time, since the magnet 2 has an arc shape in which a part of the circumference is cut off, the position of the center of rotation of the rotor yoke 1 and the center of gravity of the magnet 2 are different, and the rotor 8 can generate vibration by rotation.

[Second Embodiment] A vibration type brushless motor B according to a second embodiment of the present invention has a notch 13 provided on a part of the circumference of an arc-shaped magnet 2A as shown in FIG. I have. The position of the center of rotation of the rotor yoke 1A differs from the position of the center of gravity of the magnet 2A due to the notch 13, so that the rotor yoke 1A can generate vibration by rotation. Rotor yoke 1 having ceiling surface 1a and side surface 1b
A disk-shaped magnet 2A fixed to A and partially cut away from the center of rotation toward the outer periphery is disposed so as to face the plurality of air-core coils 5 mounted on the printed circuit board 4. ing. The magnet 2A is magnetized with four poles. Otherwise, the configuration of the vibration type brushless motor B according to the second embodiment is the same as the configuration of the vibration type brushless motor A according to the first embodiment.

Third Embodiment A brushless motor C with a vibrating core according to a third embodiment of the present invention, as shown in FIG. 5, has a center 16 of a hollow portion 15 of a disk-shaped magnet 2B and a rotor yoke 1B. And the position of the rotation center 14 is shifted, and the unbalanced vibration can be generated by the rotation of the rotor yoke 1B. Rotor yoke 1B having ceiling surface 1a
The disk-shaped magnet 2 </ b> B having a center 16 displaced with respect to the rotation center 14 and having a substantially circular hollow portion 15 provided so as to surround the rotation center 14 is mounted on the printed circuit board 4. It is arranged so as to face the plurality of air core coils 5 placed. The magnet 2B is magnetized with four poles. Otherwise, the configuration of the vibration type brushless motor C according to the third embodiment is the same as the configuration of the vibration type brushless motor A according to the above-described first embodiment.

Fourth Embodiment A vibrating brushless motor D according to a fourth embodiment of the present invention, as shown in FIG. 6, has two poles magnetized only in a part of an arc-shaped magnet 2C. A non-magnetized portion is provided on each side of the magnetized portion. At this time, the magnetized portion 18 may be located at any part of the arc-shaped magnet 2C.

Although the number of magnetized poles of the magnet 2C is two in this embodiment, the number of magnetic poles can be set to 2n poles (n = 1, 2,. The number of magnetized magnetic poles can be arbitrarily determined based on the number 5, the winding method, and other conditions. Since the shape (notch size) of the arc-shaped magnet 2C is set according to the required amount of vibration, the range of the magnetized portion 18 and the dimension (length of the arc) of the magnet 2C match as described above. No need to do. Otherwise, the configuration of the vibration type brushless motor D according to the fourth embodiment is the same as the configuration of the vibration type brushless motor A according to the first embodiment described above.

Fifth Embodiment A vibrating brushless motor E according to a fifth embodiment of the present invention has a semicircular (semicircular) magnet 2D and an N pole as shown in FIG. It is attached to the rotor yoke 1D after being magnetized in two poles with the S pole. The semi-circular magnet 2D fixed to the rotor yoke 1D having the ceiling surface 1a and the side surface 1b and cut out in a semi-circular shape from the center of rotation toward the outer periphery is mounted on the printed circuit board 4. It is arranged so as to face the plurality of air-core coils 5. FIG. 7B shows a rotor yoke 1D.
3 shows a side surface 1b in which a portion without the magnet 2D is cut away. Since the center of gravity of the magnet 2D is displaced from the center of rotation of the rotor yoke 1D, the rotor 8 can be caused to vibrate by rotation. Other 5th
The configuration of the vibration type brushless motor E according to the embodiment is the same as the configuration of the vibration type brushless motor A according to the first embodiment.

[Sixth Embodiment] A vibration type brushless motor F according to a sixth embodiment of the present invention, as shown in FIG. Are formed by bonding and fixing an arc-shaped magnet 2E, which is partially cut away. In other words, the ceiling 1a is cut radially from the center of rotation of the rotor yoke 1E toward the outer periphery. The vibration is generated by shifting the center of gravity of the magnet 2E from the rotation center of the rotor yoke 1E. Here, the cutout range of the ceiling surface 1a or the side surface 1b of the rotor yoke 1E can be arbitrarily set according to the required vibration amount, and is different from the cutout length of the magnet 2E in the circumferential direction. Further, both the ceiling surface 1a and the side surface 1b of the rotor yoke 1E may be cut out. Otherwise, the configuration of the vibration type brushless motor F according to the sixth embodiment is the same as the configuration of the vibration type brushless motor A according to the above-described first embodiment.

According to the vibration type brushless motor according to the present invention having the above-described structure, an unbalanced weight is not required, and the vibration amount required by only the rotor yoke and the magnet, which are the minimum components required for driving the motor, can be easily reduced. Obtainable. Since the magnet and the rotor yoke, which are heavier than the air-core coil, are unbalanced, large vibration can be obtained with the same applied energy, so that the efficiency is high. In addition, since the notch shapes of the rotor yoke and the magnet can be arbitrarily set, the angle can be adjusted according to the required amount of vibration. Further, by cutting out a part of the magnet, the mass of the magnet can be reduced, so that the motor can be reduced in weight and cost can be reduced.
The generation of cracks and cracks is greatly improved, and the yield is improved.

Although the above-described embodiment mainly describes an example of a three-phase four-pole three-core coil, any number of phases or 2n poles (n = 1, 2,... The effect of the present invention can be obtained by selecting the number of magnetic poles, the number of air-core coils, and the arrangement of air-core coils. Therefore, it is a matter of course that an effective effect can be obtained for a vibration type brushless motor as a vibration source of a pager, a mobile phone, and the like, which are required to be lighter and more energy-saving.

[0020]

As described above in detail, according to the present invention, it is not necessary to newly add a component required for forming a vibration, so that the cost and the man-hour are not increased. Further, the magnitude of the vibration effect (vibration amount) of the rotor yoke can be arbitrarily set as required only by setting the shapes of the rotor yoke and the magnet. It is possible to provide a brushless motor with a vibration type core that generates vibration suitable as a source.

[Brief description of the drawings]

FIG. 1 is a top view showing a motor according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along line AA of FIG.

FIG. 3 is a bottom view of the rotor of the motor according to the first embodiment of the present invention;

FIG. 4 is a bottom view of a rotor of a motor according to a second embodiment of the present invention.

FIG. 5 is a bottom view of a rotor of a motor according to a third embodiment of the present invention.

FIG. 6 is a magnetized view of a rotor bottom surface of a motor according to a fourth embodiment of the present invention.

FIG. 7 is a bottom view and a side view of a rotor according to a fifth embodiment of the present invention.

FIG. 8 is a top view of a motor according to a sixth embodiment of the present invention.

FIG. 9 is a structural diagram of a conventional vibration type motor.

FIG. 10 is a structural diagram of a conventional vibration type motor.

FIG. 11 is a structural diagram of a conventional vibration type motor.

FIG. 12 is a structural diagram of a conventional vibration type motor.

[Explanation of symbols]

 1, 1A-1E Rotor yoke 1a Ceiling surface (ceiling portion) 1b Side surface 2, 2A-2E magnet 3. Shaft 3a One end 3b Other end 4 Printed circuit board 5 Air-core coil 6 Bearing device (bearing portion) 8 Rotor A-E vibration type Brushless motor

Claims (4)

[Claims] 1. A vibration type brushless motor having an axial gap type brushless motor structure, wherein one end of a shaft is fixed to a rotation center of a rotor yoke to which a magnet is fixed, and the other end of the shaft is rotatable by a bearing. A plurality of air-core coils arranged annularly around the bearing portion; and a rotation center of the rotor yoke, which is disposed to face the plurality of air-core coils and has a ceiling portion. From the radially or semi-circularly arc-shaped magnet toward the outer periphery or the disk-shaped magnet from which a part thereof is notched, and the vibration is generated by the unbalanced rotation of the rotor. A vibration type brushless motor characterized in that it is generated. 2. The vibration type brushless motor according to claim 1, wherein the ceiling is radially cut away from the rotation center of the rotor yoke toward an outer periphery. 3. A vibration type brushless motor having a structure of an axial gap type brushless motor, wherein one end of a shaft is fixed to a rotation center of a rotor yoke to which a magnet is fixed, and the other end of the shaft is rotatable by a bearing. A plurality of air-core coils arranged annularly around the bearing portion; and a plurality of air-core coils arranged so as to face the plurality of air-core coils. The disk-shaped magnet has a center displaced with respect to the center, and has a substantially circular hollow portion provided so as to surround the rotation center. A vibration type brushless motor, wherein vibration is generated by unbalanced rotation of the rotor generated by displacement of a center. 4. The magnet according to claim 1, wherein all or a part of the magnet is magnetized with 2N (N is a positive number) sets of N poles and S poles. 2. The vibration type brushless motor according to item 1.