Electrical generator or motor structure – Dynamoelectric – Rotary
Utility Patent
1999-06-24
2001-01-02
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S268000, C310S237000, C310S242000, C310S0400MM, C310S198000, C340S311200, C200S0110DA
Utility Patent
active
06169348
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat type two-phase vibration motor which is simplified in its structure to render economical fabrication and augments interlinkage magnetic flux flowing through coils thereby elevating torque.
2. Description of the Related Art
Generally, communication indicates a technique for transmitting or exchanging intentions between two parties, and as representative means for communication, telephone, mail or facsimile are mainly used.
Among various communication means, a wireless communication technique is a rapidly growing field which is worthy of close attention.
A wireless communication technique is a much innovative technical field which enables direct conversation or intention transmission to be effected even in distant back country because it does not need communication connection means such as wire.
Among various wireless communication techniques, personal portable communication is attracting public attention. As a personal portable communication device, a portable phone or a beeper have been mainly used.
Especially, in view of the fact that a portable phone is capable of affording direct conversation, recently and all over the world, the use of portable phones has explosively increased to take the place of a general wire telephone. In addition, by using a satellite, it becomes possible to bind all the nations of the world into a single communication area, whereby the portable phone leads the transformation which is so called a communication revolution.
On the other hand, while a beeper has somewhat reduced message transmitting efficiency when compared to a portable phone because it transmits a message into the form of characters, since its purchase price and maintenance cost are relatively low, it has been widely used together with a portable phone.
Besides this, various personal portable communication devices have been developed at the present stage, and accordingly, this communication field will be considered as an up-to-date technology together with the computer field in the near future.
In the meanwhile, transmitting and receiving functions for transmitting or receiving a voice or a message are required in these communication devices, and in addition, an incoming call notifying function is also required therein.
As means for performing the incoming call notifying function, a sounding mode in which a bell or a melody is used and a vibrating mode which uses a vibration, are widely used.
In other words, if a user optionally selects a kind of bell, melody or vibration to employ in notifying of an incoming call, when an incoming call is received, a preset function is started to notify the user of the portable phone or the beeper of the incoming call.
Between the incoming call notifying modes, the vibration mode is selected so as not to exert offensive influences on its environment. This may occur because the calling signal of the alarm sound by a sound generation device beeps irrespective of the place.
On the other hand, the vibration mode is effected by a vibration motor which is disposed in a communication device, and a typical example of this vibration motor is a flat type vibration motor as shown in FIG.
1
.
This flat type vibration motor includes a lower case
1
which is disposed in a lower part of the motor. A shaft
1
a
is fastened to a center portion of the lower case
1
, and a lower board
1
b
is attached to an upper surface of the lower case
1
. A magnet
2
in which a center opening of a predetermined diameter is defined and which has a plurality of magnetic poles, is attached to an upper surface of the lower board
1
b
such that S and N magnetic poles are alternately positioned in a circumferential direction. A pair of brushes
3
are disposed in the center opening of the magnet
2
such that they are placed at different angular positions. The pair of brushes
3
have lower ends which are attached to the lower substrate
1
b
and upper ends which are positioned higher than the magnet
2
.
At this time, a bearing
1
c
is fitted around the shaft
1
a,
and a rotor is fitted around the bearing
1
c.
The rotor comprises largely an upper board
4
, and a plurality of winding coils
5
and insulators
6
which are bonded to an upper surface of the upper board
4
. The upper board
4
has a configuration which is defined by cutting a circular flat plate at a predetermined angle, to be eccentrically supported by the bearing
1
c.
Also, a commutator
7
which is formed with a plurality of segments, is attached to a lower surface of the upper board
4
. The plurality of segments are formed such that they extend from an inner edge of the upper board
4
where the upper board
4
is supported by the bearing
1
c
and they are separated one from another by the same angle. The upper ends of the pair of brushes
3
which have lower ends attached to the lower board
1
b,
are brought into contact with the plurality of segments of the commutator
7
.
On the other hand, an upper case
8
which has a cap-shaped configuration and is opened at its lower end, is coupled to an upper end of the shaft
1
a
to cover various components provided on the lower case
1
thereby protecting the components from outside interferences.
In the vibration motor constructed as mentioned above, electric power which is inputted through the lower board
1
b
is transmitted to the commutator
7
via the pair the brushes
3
. The electric power which is inputted to the commutator
7
is again transmitted to the winding coils
5
via the upper board
4
. Then, by the interaction between the winding coils
5
and the magnet
2
which is attached to the lower case
1
, electromagnetic force is generated therebetween to eccentrically rotate the rotor about the shaft
1
a,
thereby producing vibration.
At this time, vibrating force of the rotor is transmitted to the lower case
1
and the upper case
8
through the shaft
1
a,
thereby to enable the user of a portable phone or a beeper to be notified of the incoming call.
While most vibration motors adopt a three-phase driving scheme as shown in
FIG. 2
, recently, researches have been vigorously conducted in various fields to make miniaturization of the motor possible by compacting a structure of the motor, and a single-phase driving motor and a two-phase driving motor are disclosed in the art as products of these researches.
In a single-phase driving motor, a single-phase coil is formed on an upper board, and by the interaction between the single-phase coil and a magnet which is disposed in opposition to the coil, the upper board onto which the coil is seated is eccentrically rotated, thereby producing vibration. In this type of single-phase driving motor, when the coil is positioned within a range of a magnetic pole of the magnet, a death point where driving force becomes zero and a torque is not generated, is produced.
To cope with this problem of losing driving force, a method for disposing cogging generating means at a proper position is disclosed in the art. However, this method lacks practicality due to spatial limitations in a motor and difficulties in determining the precise position of the death point.
In the meanwhile, various two-phase driving motors are disclosed in the art while starting from concept in which coils in a three-phase driving scheme are reduced from three phases to two phases. One of the techniques which are recognized as a two-phase driving scheme is disclosed in Japanese Patent Laid-open Publication No. Heisei 9-9596 as shown in FIG.
3
.
Major features disclosed in Japanese Patent Laid-open Publication No. Heisei 9-9596 are in that first and second u-phase armature coils
5
a
and
5
b
and first and second v-phase armature coils
5
c
and
5
d
are located to respectively define a phase of an electrical angle of 2&pgr;, and a pair of the first u-phase armature coil
5
a
and the first v-phase armature coil
5
c
and a pair of the second u-phase armature coil
5
b
and the second v-phase armature coil
5
d
are located to respectively
Darby & Darby
Dinh Le Dang
Ramirez Nestor
Samsung Electro-Mechanics Co. Ltd.
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