Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-01-02
2004-04-06
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S090000
Reexamination Certificate
active
06717306
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns improvement of cylindrical coreless ms vibration alarm of the silent call type, by means of vibration.
2. Description of Related Art
In the past, coreless motors of this type have an eccentric weight W attached to a rotating shaft
11
that projects outside a housing
10
, as shown in FIG.
5
.
Such a coreless motor has a cylindrical external housing
10
that is reduced to a small-diameter cylinder at one end. The rotating shaft
11
, one end of which projects outside the external housing
10
from the small diameter cylinder end, passes through the central axis of the external housing
10
, and passes through and is supported by a bearing
12
fitted inside the small-diameter cylinder end, so that the rotating shaft
11
is free to rotate.
Moreover, a magnet
13
is fitted around and fixed to the outside of a bearing housing
14
. This bearing housing
14
is fitted on the coaxial position of the rotating shaft
11
, and holds a separate bearing
15
that is on the coaxial position of the rotating shaft
11
. A cylindrical coil
16
is assembled to accommodate within the inside diameter the magnet
13
, separated by a magnetic gap G. The coil
16
is held by a coil holder
17
that is mounted on the coaxial position of the rotating shaft
11
that extends beyond the bearing
15
.
Beyond that, a commutator mechanism is assembled of a commutator element
18
a
mounted on the coil holder
17
, and a brush
18
c
that is held by a brush holder
18
b
. An end cap
19
is attached, which acts to hold in place the end of the magnet
13
that is fitted around the outside of the bearing housing
14
, and to hold in place the end of the coil
16
that is held on the coaxial position of the rotating shaft
11
.
Because this coreless motor is made up primarily of metal parts, it is heavy, and because there are many parts, the assembly involves many processes, and requires much time. That is linked to high costs, and there is also a problem of precision because of the number of parts to be assembled.
SUMMARY OF THE INVENTION
The goals of this invention are to reduce weight by reducing the metal parts, and to reduce costs by reducing assembly processes and time by means of a smaller number of parts, thus providing a highly precise coreless motor with improved precision of assembly.
In the coreless motor of this invention, there is a cylindrical external housing with a through hole in a central position in the closed end. A molded resin body is molded into place through the through hole of the external housing; one end is a bearing that supports the rotating shaft, and it continues on the coaxial position of the rotating shaft to become a bearing housing that is fitted into place. The molded resin body is the base on which both the rotor and the stator are assembled.
Further, in the coreless motor of this invention, there are concave notches in the end of the bearing housing, and there is a hold-down collar that has on its inner diameter protrusions that mate with the notches in the bearing housing. The stator is assembled with the magnet held down by this hold-down collar that at the same time meshes the magnet with the periphery of the bearing housing.
Moreover, in the coreless motor of this invention, there is a bearing that has an oil reserve that lubricates the inner surface of the through hole through which the rotating shaft passes.
REFERENCES:
patent: 4806025 (1989-02-01), Kamiyama et al.
patent: 5559382 (1996-09-01), Oku et al.
patent: 5874794 (1999-02-01), Trammell et al.
patent: 5889349 (1999-03-01), Yasuda
patent: 54-141309 (1979-10-01), None
patent: 54-141309 (1979-10-01), None
patent: 58-29361 (1981-08-01), None
patent: 62-203538 (1987-09-01), None
patent: 9-23628 (1997-01-01), None
Kawai Shouhei
Kudou Mitugu
Hanh Nguyen N
Le Dang
Namiki Seimitsu Hoseki Kabushiki Kaisha
Robinson Eric J.
LandOfFree
Coreless 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 Coreless motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coreless motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3208958