JP2579296Y2 - Vibration motor rotor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotor of a vibration motor used for a pocket type pager.

[0002]

2. Description of the Related Art A cylindrical vibration motor used for a pocket-type pager must generate a large whirling vibration force with low power consumption, and have a small diameter and a short length.
Conventionally, for this purpose, an eccentric weight having a high specific gravity is swung around a cylindrical coreless motor. The cylindrical coreless motor uses a thin-walled rare-earth magnet for the field, and the magnet and bearing are housed inside the cup-shaped rotor, so that a small-diameter, short-length motor can be manufactured. This contributes to making the pager set smaller and thinner.

However, the conventional coreless motor uses a thin-walled rare-earth magnet in the field in order to reduce its size, and the eccentric weight added to the outside is small and generates an effective whirling force. It was expensive because it was made of a high specific gravity metal.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in a vibration motor, an annealed iron wire is tightly wound around the outer periphery of a weight having an eccentricity through which a shaft penetrates, and a conductor wire is wound thereon. By forming a slotless smooth rotor, an inexpensive and thick magnet having a low energy product can be used, and a thin motor and a short axial length can be achieved.

[0005]

2A is a sectional view of the slotless motor according to the present invention, and FIG. 2B is a sectional view taken along the line XX 'in FIG. 2A. In the figure, 1 is a magnet, 2 is a case and magnet back yoke, 3 is a rotor, 4 is a rotor 3
The armature winding 5 wound on the outer periphery of the rotor is a commutator, and is supplied with electric power from a brush (not shown), and energizes the winding 4 of the rotor 3 through the commutator 5 to rotate the rotor. Rotate 3 Reference numeral 6 denotes a shaft, and 7 denotes a bearing that rotatably supports the shaft. Reference numeral 8 denotes an iron core described with reference to 8 in FIG. 1, and reference numeral 9 denotes a weight described with reference to 9 in FIG.

FIG. 1 is a detailed structural view of a core portion of a rotor, 8 is an iron core tightly wound with an annealed iron wire having soft magnetism, 9
Are weights with an eccentric center, which are connected to the shaft 6. FIG. 3 shows a state in which a winding is wound on the outer periphery of the rotor core portion in FIG. 1, where 10 is a core portion, 5 is a commutator, and winding 11 is bent along a guide blade 12. Therefore, it is distributed and wound on the outer periphery of the core portion across the axial facing surface. A tap is provided at a specified number of turns in the middle of winding, and the tap is connected to a predetermined piece of the commutator 5.

[0007]

FIG. 2 shows the flow of the field magnetic flux in the motor.
This is as shown by the broken line in (b). That is, magnet 1
The magnetic flux emitted from the N pole reaches the iron core 8 via the air gap and the armature winding 4, then reaches the S pole of the magnet 1 through the reverse path, and returns to the magnet 1 via the back yoke 2. The present invention is applicable not only to a two-pole configuration but also to a multi-pole configuration.

[0008]

According to the present invention, even when a thick magnet 1 is used as shown in FIG. 2, the width W can be kept thin, so that an inexpensive magnet with a low energy product can be used. It is. Despite being a cored rotor, the bearing part can be housed in the internal space of the cup-shaped armature winding like a conventional coreless motor, but instead the eccentric weight is placed inside the rotor iron core. Since it can be stored, the axial dimension L in FIG. 2 can be reduced. Furthermore, since the weight can take up to the effective length of the winding, that is, the axial length of the magnet, by selecting relatively inexpensive materials such as iron, copper, and brass, it is possible to manufacture the whole compact and inexpensive.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotor core of the vibration motor of the present invention.

2A is a cross-sectional configuration diagram of the slotless motor according to the present invention, and FIG. 2B is a cross-sectional configuration diagram taken along the line XX ′ in FIG. 2A.

FIG. 3 is a perspective view showing a state in which a winding is wound around the outer periphery of a rotor core in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet 2 Case 3 Rotor 4 Armature winding 5 Commutator 6 Shaft 7 Bearing 8 Iron core 9 Weight 10 Core part 11 Winding 12 Guide blade

Claims (1)

(57) [Scope of request for utility model registration] In a vibration motor, an annealed iron wire is tightly wound around an outer periphery of a weight having an eccentric center through which a shaft penetrates, and a conductor wire is wound thereon to form a slotless smooth rotor as a whole. A rotor for a vibration motor.