JP3631871B2 - Small motor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a coreless motor. More specifically, the present invention relates to a compact motor or gyro motor that is used in vibration alarm devices and the like, is compact, lightweight, easy to manufacture, excellent in portability, excellent in mass productivity. It is.
[0002]
[Prior art and its problems]
In recent years, attention has been paid to a pager device using a vibration method instead of a ringing method using sound, and improvements have been made to motor devices that generate vibrations.
As this motor device, for example, a hollow cylindrical coreless motor device shown in FIG. 3 is known. This apparatus has a rotor comprising a cylindrical coil 1, a cylindrical coil support 2, a commutator 3 formed on the support, and a rotating shaft 4 that passes through the center of the support and is fixed to the support. The rotating shaft 4 of the rotor is inserted into a hollow cylindrical field magnet 5 and is disposed on one end side in the cylindrical housing case 6 and on the other end side of the housing case 6. The bearing 8 is supported.
[0003]
Normally, in the coreless motor device having this structure, an eccentric weight 10 having a biased center of gravity is provided at the tip of the rotating shaft 4, and the commutator 3 is configured to be in contact with the brush 9 on the stator side. The housing case 6 is fixed to a holder in a case such as a pager, and the eccentric weight 10 is rotated to transmit this vibration to the pager body via the housing case 6 so that the function as a vibration pager is exhibited.
[0004]
However, in a situation where a smaller device is required for portable use, in the structure of such a hollow cylindrical coreless motor device, if the weight diameter becomes small, vibration force cannot be obtained, and the necessary vibration amount In order to obtain this, a heavy weight having a long length must be used. In practice, there is a limit to reducing the size and weight of the motor device.
[0005]
Further, as shown in FIG. 3, in the conventional vibration motor, the housing case 6 is fixed to a main body such as a pager or a mobile phone, and the eccentric weight 10 fixed to one end of the rotating shaft 4 is swung around by one side support. There is a problem that the shaft is burdened and causes bending, which is weak against impact and cannot be made into an extremely small diameter.
Further, when used in a gyro motor or the like, a small and light weight resistant to a drop impact has been desired, but there is a limit to the current method of rotating the shaft.
[0006]
The present invention has been made in view of the circumstances as described above, and provides a new cylindrical coreless small motor that improves the drawbacks of the conventional device, is easy to manufacture, has excellent impact resistance, and is small and high in performance. The purpose is that.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems of the prior art, and will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. The small motor of the present invention has a cylindrical coil 11 fixed to the inner periphery, and one end. A brush comprising a rotor 17 comprising a cylindrical yoke 16 having a bearing 17 with a commutator 13 fixed thereto and a bearing 18 fixed to the other end, and a hollow cylindrical field magnet 15 and a brush 19 inside the rotor. The rotor 12 includes a stator 14 having a shaft 14 to which the base 12 is fixed, and the rotor bearings 17 and 18 are rotatably mounted on the stator shaft 14.
[0008]
In the small motor of the present invention, an arc-shaped weight 20 is fixed to the outer peripheral portion of the cylindrical yoke 16, and a mounting base 22 for mounting the main body is fixed to both ends of the shaft 14.
[0009]
In the small motor of the present invention, both ends of the shaft 14 are fixed to the mounting base 22 via caps 21 made of an elastic material such as rubber or resin.
[0010]
In the small motor of the present invention, the cylindrical yoke 16 may be formed, for example, by spirally winding a magnetic wire.
[0011]
In the small motor of the present invention, the bearing 17 with the commutator 13 is formed of an integral resin.
[0012]
[Action]
In the small motor of the present invention, as described above, the cylindrical coil 11 is fixed to the inner periphery of the cylindrical yoke 16 that also serves as a housing case, so that the gap between the outer periphery of the cylindrical coil and the inner periphery of the case is conventional. Since the gap between the cylindrical coil 11 is only one side of the gap between the cylindrical field magnet 15 and the gap between the cylindrical yoke 16 and the cylindrical field magnet 15, the gap between the cylindrical yoke 16 and the cylindrical field magnet 15 can be reduced. Torque can be increased because it is possible. Further, since the housing rotates, it can be used as a flywheel, and a gyro having a light weight can be provided.
[0013]
In the small motor of the present invention, as described above, the arc-shaped eccentric weight 20 is fixed to the outer peripheral portion of the cylindrical yoke 16 that also serves as a housing case. Therefore, the moment force to swing is efficient and large, and it can be used for the thrust length of the outer periphery of the cylindrical yoke 16. Therefore, a small motor for vibration with a large vibration force while having a small diameter and short length is provided. it can. In addition, since the structure supported at both ends of the shaft 14 can be taken, the impact resistance is improved.
[0014]
In the small motor according to the present invention, as described above, in the small motor for generating vibration according to claim 2, the shaft 14 is fixed to the mounting base 22 via the caps 21 made of an elastic material such as rubber or resin. Improves impact resistance and has noise prevention effect.
[0015]
Further, in the small motor of the present invention, the cylindrical yoke 16 may be formed by spirally winding a magnetic wire, so that yokes can be stacked at low cost and with good mass productivity, and eddy current can be prevented. As a result, the torque is improved.
[0016]
Further, in the small motor of the present invention, since the bearing 17 with the commutator 13 is formed of an integral resin as described above, it is possible to reduce the cost and mass production of the motor.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of a small vibration motor according to an embodiment of the present invention. FIG. 2 is a view for explaining the shape of an arc-shaped eccentric weight of a small vibration motor showing an embodiment of the present invention.
[0018]
As shown in FIGS. 1 and 2, the vibration small motor according to the embodiment of the present invention reverses the idea from the conventional cylindrical coreless motor, fixes the shaft, and tries to rotate the case side. . Therefore, the cylindrical coil 11 is fixed to the inner periphery on the rotor side, the bearing 17 with the commutator 13 formed of an integral resin is fixed to one end, and the cylindrical yoke 16 with the bearing 18 fixed to the other end is the case. In addition, the shaft 14 is configured to be rotatable via bearings 17 and 18. The cylindrical yoke 16 is formed by winding a magnetic wire in a spiral shape, and it is possible to stack low-cost and mass-productive yokes, thereby improving torque by preventing eddy currents.
[0019]
Further, on the stator side, the rotor bearings 17 and 18 to which a brush base 12 having a hollow cylindrical field magnet 15 and a brush 19 is fixed, and a shaft 14 rotatably supported by a shaft are provided at both ends thereof. It is fixed to the mounting base 22 via a cap 21 made of an elastic material such as resin.
[0020]
Further, since it is used as a vibration motor, an arc-shaped weight 20 is fixed to the outer peripheral portion of the cylindrical yoke 16, and when used as a small vibration motor, since the weight is first on the outermost periphery, the moment force to be swung is efficient and large. Since it can be used for the thrust length of the outer periphery of the cylindrical yoke 16, it is possible to provide a small motor for vibration having a large vibration force while being small and light with a minimum diameter and a short length direction. Moreover, since the structure supported by the both ends of the shaft 14 can be taken, impact resistance improves. Furthermore, since both ends of the shaft 14 are fixed to the mounting base 22 via caps 21 made of an elastic material such as rubber or resin, the impact resistance is improved and the noise is prevented.
[0021]
In addition, since the cylindrical coil 11 is fixed to the inner periphery of the cylindrical yoke 16 that also serves as the housing case, it is not necessary to manage the gap between the outer periphery of the cylindrical coil and the inner periphery of the case as in the prior art, and the cylindrical coil 11 Compared with the conventional case, the gap is only one side of the gap between the cylindrical field magnet 15 and the gap between the cylindrical yoke 16 and the cylindrical field magnet 15 can be narrowed, so that torque can be increased. Further, since the housing rotates, it can be used as a flywheel, and a gyro having a light weight can be provided.
[0022]
【The invention's effect】
As described above in detail, according to the present invention, a new cylindrical coreless small motor that is easy to manufacture and excellent in impact resistance, that is small, light, and high in performance can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a small motor according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of a small motor showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a configuration of a conventional cylindrical coreless vibration motor.
[Explanation of symbols]
1, 11 Cylindrical coil 2 Coil support 3, 13 Commutator 4 Rotating shaft 5, 15 Field magnet 6 Housing case 7, 8, 17, 18 Bearing 9, 19 Brush 10, 20 Weight 12 Brush stand 14 Shaft 16 Cylindrical yoke 21 Cap of elastic material 22 Mounting base

Claims (2)

A cylindrical abduction rotor with a cylindrical coil fixed to the inner periphery and bearings and commutators arranged at both ends, and a shaft with a brush stand having a field magnet and a brush fixed to the inside of the rotor In the outer rotor type motor structure in which the rotor bearing is rotatably attached to the stator shaft,
The abduction rotor is composed of a magnetic cylindrical yoke, and an arc-shaped weight is fixed to the outer periphery of the rotor, and mounting bases for mounting the motor body are disposed at both ends of the shaft. A small motor characterized in that the mounting base is supported on an edge via an elastic material cap, and one bearing for pivotally supporting the abduction rotor is a resin-integrated bearing with a commutator. 2. The small motor according to claim 1, wherein the cylindrical yoke of the abduction rotor is formed by spirally winding a magnetic wire.

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