Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-03-28
2003-12-09
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S081000
Reexamination Certificate
active
06661138
ABSTRACT:
BACKGROUND TO THE PRESENT INVENTION
1. Field of the Invention
The present invention relates to a vibration generating motor. More specifically the present invention relates to vibration generating motors which enable easy use in cellular phones, pagers, entertainment game controllers and other consumer products requiring small and effective vibration generating motors.
2. Description of the Related Art
Referring now to
FIGS. 8 and 9
, a conventional vibration generating motor
1
includes a plurality of rotors
3
, rotatable about a rotary shaft
2
. A magnet (not shown) surrounds the plurality of rotors
3
, as in known small-sized DC motors.
Each rotor
3
includes a rotary core
4
, each having respective coil winding portions
4
a,
4
b,
and
4
c,
as shown. Respective coils
5
a,
5
b,
and
5
c
are wound upon respective coil winding portions
4
a,
4
b,
and
4
c,
as shown.
During use, a DC voltage is applied to coils
5
a,
5
b
and
5
c
by way of a spring(not shown), disposed on rotary shaft
2
. Under the influence of the DC voltage, rotors
3
are driven by the interrelation of a magnetic flux (not shown) generated on coils
5
a
,
5
b
and
5
c
and a magnetic flux of the magnet.
During assembly, a weight
6
is inserted and fixed between selected neighboring coil winding portions, (
4
a
and
4
c,
as shown for example).
Weight
6
is specifically designed with a rectangularly columnar body
6
a
to fit specifically in the profile of the space formed between core winding portions
4
a,
4
c.
A step
6
b,
projected in two directions from an end of columnar body
6
a,
is specifically designed to aid fitting in the profile space formed.
When weight
6
is inserted between coil winding portions
4
a
and
4
c,
step
6
b
contacts each winding portions
4
a,
4
c
and weight
6
is thereby axially positioned therebetween. One end of weight
6
is fixed by clinching, or another similar operation, while an opposite end of weigh
6
is fixed in place by an adhesive such as a chloroprene rubber adhesive.
As noted above, during operation, rotors
3
are driven when respective coils
5
a,
5
b
and
5
c
are energized. Since weight
6
is fixed between coil winding portions
4
a
and
4
c,
a center of rotational gravity of plurality of rotors
3
is deviated, in eccentric state, from a center axis of rotary shaft
2
. Accordingly, due to rotation of rotors
3
, conventional vibration generating motor
1
as a whole generates vibration.
Unfortunately, weight
6
in conventional vibration generating motor
1
is strongly fixed by an adhesive agent between coil winding portions
4
a
and
4
c
of core
4
to resist unplanned separation. This is detrimental to cost, speed, and efficiency, since in an a conventional assembling process a hardening furnace for hardening the strong adhesive agent is required and the hardening time necessarily lengthens the production process.
Consequently, the production cost of conventional motors is detrimentally expensive. As a further detriment, in conventional vibration generating motor
1
it is not easy to remove weight
6
from core
4
and thereby recycle used weights
6
. This prevents or severely limits recycling and increases manufacturing waste.
It is also know that instead of the adhering process shown, it is possible to fix weight
6
between coil winding portions
4
a
and
4
c
by a welding process. Unfortunately welding processes, require welding equipment and a welding time, thus providing similar production disadvantages. As further disadvantages to a welding process, the heat generated during welding frequently deforms rotary cores
4
, and recycling weight
6
is similarly prevented.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a vibration generating motor which overcomes the detrimental designs provided above and provides reduced costs and increased production efficiencies.
It is another object of the present invention to provide a vibration generating motor which can be assembled in an easy manner with reliable attachment.
It is another object of the present invention to provide a vibration generating motor wherein an eccentric weight can be easily recycled.
It is another object of the present invention to provide a device which maximizes the available space between adjacent rotors while providing secure assembly and reliable operation.
Briefly stated, the present invention relates to a vibration generating motor providing simple and fast assembly, and ready recycling. A motor includes a plurality of rotors around a rotary shaft, a plurality of coil winding portions on respective rotors, and a coil on each respective coil winding portion. At least a two part weight is positioned between selected coil winding portions and has an seperably upper and lower part, allowing weight maximization at low cost while conserving space.
According to one embodiment of the present invention, there is provided a vibration generating motor comprising: at least a first, a second, and a third rotor operable about a rotary shaft, a coil winding portion on respective each the rotor, a plurality of coils wound on respective each the coil winding portion, a weight member, the weight member having a shape enabling selective and fixable positioning at a first position between two adjacent ones of the at least first, second, and third rotors during an assembly of the motor, the weight member including an upper part and a lower part, the upper part including an upper body and a first and a second upper flange, the lower part including a lower body and a first and a second lower flange, means for seperably coupling the upper and the lower parts of the weight member during the assembly, the upper body and the lower body contacting during the assembly, the first and the second upper flanges contacting a top surface of the coil winding portions on respective the two adjacent ones, and the first and the second lower flanges contacting a bottom surface of the coil winding portions on respective the two adjacent ones, whereby the means for separably coupling securely joins the weight member to the adjacent ones and enables a rapid assembly and secure operation of the motor.
According to another embodiment of the present invention there is provided a vibration generating motor, wherein: the means for separably coupling includes at least a first upper inserting opening on the upper body extending in an axial direction of the motor, the means for separably coupling further includes at least a first lower inserting opening in the lower body extending coaxial with the first inserting opening, and a the means for separably coupling including at least a first rivet member passing through the first upper and the first lower inserting openings and fixing the upper and lower parts together during the assembly, whereby an assembly time and an assembly cost are easily reduce for the motor.
According to another embodiment of the present invention there is further provided a vibration generating motor, wherein: the first upper inserting opening has a first diameter, an upper recess on a top surface of the upper part has a second diameter larger than the first diameter, the first lower inserting opening has a third diameter, a lower recess on a bottom surface of the lower part has a fourth diameter larger than the third diameter, and the upper and the lower recess receive a first and a second enlarged portion of the rivet during the assembly.
According to another embodiment of the present invention there is further provided a vibration generating motor, wherein: the means for separably coupling includes a locking hole portion axially positioned in the upper body, the means for separably coupling includes a locking protrusion axially extending from the lower body, the locking hole and the locking protrusion being coaxial, and the locking protrusion locking into the locking hole portion during the assembly and removably fixing the upper part and the lower part together.
According to another embodiment of the present invention
Osawa Fumihiko
Osumi Takashi
Shinoda Takeshi
Darby & Darby
Mitsumi Electric Co. Ltd.
Mohandesi Iraj A.
Ramirez Nestor
LandOfFree
Vibration generating motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibration generating motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibration generating motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3159946