Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-02-03
2002-06-25
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S063000, C415S199100
Reexamination Certificate
active
06411000
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a motor with a cooling means. More particularly, this invention relates to a motor with a cooling means that can efficiently cool heat of a motor generated during the operation of a motor.
In general, a motor is classified into a DC motor and an AC motor. The DC motor, such as a series motor, a shunt motor and a compound motor, rotates as DC power is supplied to a rotator. The AC motor rotates by using AC power, and an induction motor, a synchronous motor and an alternating current commutator motor are such kinds. Electric energy is consumed in a coil member of a motor and heat is generated while a motor is driven due to a high-speed rotational motion. The generated heat may cause damage to a motor, for example, a severe heat burning of a coil may incur. Therefore, it is necessary that heat generated in the motor while the motor is running must be discharged. Accordingly, there have been many means put forth in effort to resolve the cooling problem in the motor.
FIGS. 1 and 2
illustrate the conventional motor, where
FIG. 1
is a perspective view and
FIG. 2
is a vertical cross section.
Referring to
FIGS. 1 and 2
, the conventional motor
100
comprises: a rotation axis
101
located in the center of a motor; a rotator assembly
102
fixed on to the rotation axis
101
by the pressure and rotates with the rotation axis
101
; a stator assembly
103
installed in order to surround the rotator assembly
102
; a bearing
104
is installed to support the rotation axis
101
; and, a stator winding
105
individually placed in upper and lower portions of the stator assembly
103
. Also, radial fans
106
,
106
′ are installed in between upper and lower portion of the bearing
104
and a upper and lower portions of the stator winding
105
to circulate air to cool the inside of the motor. And, outer parts of upper and lower portions of the bearing
104
are attached with an endshield
107
and
107
′ consists of a bearing housing
107
b
,
107
′
b
to protect the interior structure and an air inlet member
107
h
,
107
′
h
and to draw in the air.
In the conventional motor, when electric power is supplied to the stator winding
105
, a rotating magnetic field is generated by the stator winding
105
. And, the rotator assembly
102
is rotated through the interaction between the rotating magnetic field and the magnetic field generated by the permanent magnet of the rotator assembly
102
. Accordingly, the rotation axis
101
fixed on to the rotator assembly
102
rotates and at the same time the radial fan
106
,
106
′ fixed on to the rotation axis
101
also rotates.
When the motor is operated for a long period of time, the heat (Joule heat) is generated by the stator winding
105
causing the interior temperature of the motor to rise. The radial fan
106
,
106
′ rotates along with the rotation axis
101
and the rotator assembly
102
, and directs the circulation of an interior air of the motor. As a result of rotation of the radial fan
106
,
106
′, a heated air existed in between blades of the fans flows to outside by the centrifugal force of the rotation. Accordingly, an interior air pressure of the motor becomes relatively lower than an air pressure of the outside of the motor and the exterior cooler air flows into the interior of the motor through the air inlet
107
h
,
107
′
h
formed at the horizontal surface of the endshield
107
,
107
′. Thereafter, the air that induced into the interior of the motor is then drawn out to outside by the fan rotation, thereby the air is continuously circulated. Accordingly, the stator assembly
103
and the rotator assembly
102
are cooled by the air-cooling means to prevent rapid temperature increase in the interior of the motor.
As described above, the conventional motor utilizes the radial fan
106
,
106
′ as the cooling means. Referring to
FIG. 3
, the radial fan
106
placed in the upper portion of the rotator assembly
102
has the characteristics of a small air flow and a high static pressure. As a result, amount of air circulated by the radial fan is limited, thus the cooling effect is not efficient. When the motor is rotating at high speed, heat is generated in the upper and lower portions of the bearing
104
, however, there is no cooling means to relieve the generated heat. As a result, oil or grease in the bearing
104
becomes dry causing decline in the performance of the bearing and shorten of the bearing life span.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to obviate the disadvantages of the foregoing prior art by providing a motor with a cooling means which can more efficiently cool the heat generated in the interior of the motor and the bearing during operation of the motor.
These and other objects are satisfied by a motor with a cooling means comprising: a rotation axis; a rotator assembly fixed to the rotation axis; a stator assembly surrounds the rotator assembly; a bearing attached to both ends of the rotation axis to support the rotation axis; an axial-flow fan used as a cooling means placed between each bearing and the rotator assembly to cool the stator assembly and the rotator assembly; an endshield attached to both ends of a housing to protect the structure and consists a plurality of air intakes; and a plurality of cooling pins formed to the outer surface of endshield to draw out the heat generated in the bearing and the interior of the motor during operation of the motor.
Other objects of the present invention are satisfied by a motor with a cooling means comprising: a rotation axis; a rotator assembly fixed to the rotation axis; a stator assembly surrounds the rotator assembly; a bearing attached to both ends of the rotation axis to support the rotation axis; an axial-flow fan used as a cooling means placed between each bearing and the rotator assembly to cool the stator assembly and the rotator assembly; an endshield attached to both ends of a housing to protect the structure and consists a plurality of air intakes; and a plurality of through holes formed to the rotator assembly to circulate the air.
Other objects of the invention are satisfied by a motor with cooling means comprising: a rotation axis; a rotator assembly fixed to the rotation axis; a stator assembly surrounds the rotator assembly; a bearing attached to both ends of the rotation axis to support the rotation axis; a hybrid fan formed from combination of the radial fan and the axial-flow fan used as a cooling means placed between each bearing and the rotator assembly to cool the stator assembly and the rotator assembly; an endshield attached to both ends of a housing to protect the structure and consists a plurality of air intakes; and a plurality of through holes formed to the rotator assembly to circulate the air. Wherein, the hybrid fan comprises: a hub having two cylinders with the different radius are connected to the axis direction; an axial-flow fan placed in the outer surface of the cylinder of the hub of a larger radius; and a radial fan placed in the outer surface of the cylinder of the hub with a smaller radius.
From the subsequent detailed description, appended claims and drawings, other objects and advantages of the present invention will become apparent to those skilled in the art.
REFERENCES:
patent: 2690513 (1954-09-01), Tamm
patent: 4797602 (1989-01-01), West
patent: 5375637 (1994-12-01), Matsumoto et al.
patent: 5925960 (1999-07-01), Hayes
patent: 6144121 (2000-11-01), Ishida et al.
Dinh Le Dang
Fleshner & Kim LLP
LG Electronics Inc.
Ramirez Nestor
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