Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-03-20
2001-06-12
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S081000, C310S0400MM
Reexamination Certificate
active
06246143
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat coreless vibrator motor using magnetic latching power suitable for use as a silent alert source for a small, portable communication device such as a radio pager or a portable telephone or a vibration source for a massager.
2. Description of the Related Art
A conventional flat coreless vibrator motor is disclosed in U.S. Pat. No. 5,036,239.
The flat coreless vibrator motor where a number of, for example, three armature coils 99 are eccentrically arranged is popular in the market since it is possible to control the amount of eccentricity of the center of gravity of a rotor to be large. However, it costs much to manufacture the flat coreless vibrator motor of the three coil type since there are three coils. Also, as shown in U.S. Pat. No. 5,036,239, in the flat coreless vibrator motor of the three coil type, all the coils contribute to the production of torque during a rotation for only an extremely short time and, in general, current flows through only two coils according to the principle of the rotation.
SUMMARY OF THE INVENTION
To solve the above problem, it is an object of the present invention to provide a flat coreless vibrator motor capable of holding a rotor in a specific position so as to effectively obtain a magnetic flux from a magnet by magnetic latching power, increasing vibration by increasing the amount of eccentricity of the center of gravity of the rotor, improving the mobility of the rotor since the adjacent segments of a commutator are not shorted, and whose manufacturing expenses are cut down by reducing the number of coils or the available sectional area of a magnet.
Accordingly, to achieve the above object, there is provided a flat coreless vibrator motor using magnetic latching power, comprising an eccentric rotor in one side of which at least one coreless coil is arranged and in which a commutator is installed, a magnet for providing a magnetic field to the eccentric rotor, means for holding at least one coreless coil of the eccentric rotor in a specific position using the magnetic power of the magnet, a pair of brushes for supplying power to the eccentric rotor through the commutator, and a protrusion arranged between segments so that the adjacent segments of the commutator are not shorted by the brushes.
It is possible to improve the mobility of the flat coreless vibrator motor since the eccentric rotor is held in a specific position when it stops and to prevent adjacent segments from being shorted by the protrusion.
At least one of the two sides of the protrusion is preferably a concave portion.
It is possible to prevent abrasion powder such as a synthetic resin from gathering in the concave part of the protrusion and coming out to the surfaces of the segments.
The commutator is formed on a printed circuit board to be of a flat type, the protrusion is formed of the printed circuit board, and the concave portion is formed by performing etching.
It is possible to easily form the protrusion.
It is preferable that there are two coreless coils and that one of the two coreless coils is formed by winding magnetic plated wire as means for holding the coreless coils at specific positions.
It is possible to hold the eccentric rotor in the specific position by only the coil when it stops.
The coreless coil formed by winding the magnetic plated wire has a smaller number of windings than the other coreless coil or less magnetic latching power is used in the coreless coil formed by winding the magnetic plated wire.
It is possible to reduce mobility torque since the magnetic latching power is not very large.
The width of the magnet (the difference between the outer diameter of the magnet and the inner diameter of the magnet) is preferably almost equal to the inner diameter of the coil.
It is possible not to increase the manufacturing expenses of a magnet and to firmly hold the eccentric rotor in the specific position by the available conductor portions of the coil since the unavailable conductor portions of the coil is not attracted by the magnet.
To achieve the above object, there is provided a flat coreless vibrator motor, comprising an eccentric rotor, in one side of which at least one coreless coil is arranged and in which a commutator having four segments each diametrically-opposite pair of which are shorted is installed, a four-pole magnet which has alternate north and south poles for providing a magnetic field to the eccentric rotor, means for holding the at least one coreless coil of the eccentric rotor so that available conductor portions are at a specific position when the eccentric rotor stops using the magnetic power of the magnet, a pair of brushes for supplying power to the eccentric rotor through the commutator in a position where the angle formed by the commutator and the brushes is 90°, and a protrusion arranged between the segments of the commutator to have the same level as the level of the surfaces of the segments so that the adjacent segments are not shorted by the brushes and that the brushes do not touch the protrusion.
It is possible to improve the mobility of the eccentric rotor since the eccentric rotor is held in a specific position when it stops and to prevent the adjacent segments from being shorted by the protrusion.
REFERENCES:
patent: 3538365 (1970-11-01), Reisnecker
patent: 5036239 (1991-07-01), Yamaguchi
patent: 5793133 (1998-08-01), Shiraki et al.
patent: 5942833 (1999-08-01), Yamaguchi
Leydig , Voit & Mayer, Ltd.
Nguyen Tran
Tokyo Parts Industrial Co., Ltd.
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