JPH079062U - Vibration generator motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration generating motor that is used for vibration calls of pagers and mobile phones, has a small number of parts, has a simple structure, and can be made inexpensive and compact. [Structure] Of the rotor, the stator, and the weights arranged in the magnetic yokes 1 and 6 of the flat motor, the weight is removed,
A vibration generating motor having a structure in which the magnetized state is changed from rotational symmetry without changing the shape of the rotor magnet 3, and a plurality of coils 4 are arranged in a plane and rotationally symmetric inside the magnetic yokes 6 and 1. In the structure in which the rotor and the stator of the plate-shaped magnet 3 having a plurality of magnetic poles divided in the circumferential direction are arranged, at least one or more of the plurality of magnetic poles of this magnet as a stator are arranged. A vibration generating motor having a structure in which a stator having a magnet 3 whose magnetic pole is weaker than other magnetic poles is incorporated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat vibration generating motor used for pagers, mobile phones, etc. and used for vibration alarms and the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a flat type vibration generating motor used for this type of application has a rotor base 8 as a rotor mainly using a weight 7 whose center of gravity is eccentric with respect to the center of a rotating shaft 9 of the motor, as shown in FIG. Vibration was generated by a rotor which was fixed to the rotor and whose center of gravity was biased with respect to the rotating shaft 9. As a result, the number of parts increases and the shape is complicated, resulting in high manufacturing cost and difficulty in downsizing.

[0003]

[Problems to be solved by the device]

 SUMMARY OF THE INVENTION The present invention provides a vibration generating motor which has the above-mentioned problems eliminated, a weight is removed and the number of parts is small, and which has a simple structure and which can be made small in size at low cost.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention removes the weight from the rotor, the stator, and the weight arranged in the magnetic yoke, and changes the magnetized state of the rotor magnet without changing the shape of the rotor magnet. Vibration is generated by using a structure deviated from rotational symmetry.

That is, according to the present invention, a rotor having a plurality of coils arranged in a plane inside a magnetic yoke, and a plate-shaped magnet stay having a plurality of magnetic poles divided in the circumferential direction. In a flat type motor in which the magnets are arranged, the stator is composed of a combination of a stator of a magnetette in which at least one of the plurality of magnetic poles of this magnet is weaker than other magnetic poles. It is a characteristic vibration generation motor.

[0006]

[Action]

 A general rotary motor is designed so that a plate-shaped magnet has magnetic poles arranged symmetrically with respect to the rotation axis and that the rotation is smooth. On the contrary, in the present invention, in the arrangement of the magnetic poles, the magnetic poles are rotationally symmetrically divided in advance, and one or more of the magnetic poles are magnetized to have a smaller magnetization state than the other magnetic poles. Since the strength is distributed asymmetrically, the rotation loses smoothness and vibration occurs. The vibration mode can be selected depending on the magnitude of this magnetization, the number of magnetic poles and the arrangement state. In order to decenter the shape of the magnet with respect to the center of rotation, it is necessary to complicate the shape in terms of the arrangement and strength of the magnetic poles, but when decentering with magnetization, it can be done only by the magnetizing operation, and it is cheap and compact. Is possible.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a vibration generating motor according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing an example of a conventional vibration generating motor.

In FIG. 1, magnetic yokes 6 and 1 consist of a case made of mild steel and having a bottomed cylindrical shape and a disk-shaped lid, and a bearing 2 is fixed to the center of the inside of this magnetic yoke. The magnet 3 is ring-shaped, is divided into four parts in rotational symmetry with respect to the center, and is magnetized so that the polarities alternate. One of the magnetic poles is magnetized to a strength that is one-fourth or less that of the other magnetic poles. The magnet 3 is fixed inside the lid of the magnetic yoke 1 with its center aligned with the center of the bearing. The rotor has a disk-shaped rotor base 8 made of insulating resin, and three coils 4 which are wound in a plane shape are fixed in rotational symmetry with respect to a rotating shaft 9, and the ends of each winding are fixed in the center. The commutator 5 is terminated. A rotary shaft 9 is fixed to the center of the rotor. As shown in FIG. 1, the rotor is installed inside the case and lid of the magnetic yokes 6 and 1, and the terminals are pulled out to complete the process.

When the motor thus completed is energized, one of the magnetic poles is weakly magnetized, so that the rotation is not smooth and vibration is generated. Therefore, since vibration can be generated without attaching a weight, the shape can be made smaller, the number of parts can be reduced, and a vibration generating motor can be manufactured at low cost.

[0010]

[Effect of device]

 As described above, according to the present invention, it is possible to provide an inexpensive vibration generating motor that can be used for a vibration call of a small pager or a mobile phone.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a vibration generating motor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an example of a conventional vibration generating motor.

[Explanation of symbols]

 1 magnetic yoke (lid) 2 bearing 3 magnet 4 coil 5 commutator 6 magnetic yoke (case) 7 weight 8 rotor base 9 rotating shaft

Claims (1)

[Scope of utility model registration request] 1. A flat type in which a rotor having a plurality of coils arranged in a plane and a stator of a plate-shaped magnet having a plurality of magnetic poles divided in the circumferential direction are arranged inside a magnetic yoke. In a motor, a vibration generating motor characterized by a structure in which a stator of a magnet, in which at least one magnetic pole is weaker than other magnetic poles among a plurality of magnetic poles of the magnet, is combined as a stator.