Rotor balance structure

Details Rotor balance structure Rotor balance structure

2000-04-18

2001-09-18

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S051000, C310S261100

Reexamination Certificate

active

06291916

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a rotor balance structure and, in particular, to a rotor balance structure utilizing electromagnetic induction for the rotor to attain force balance in rotation.
BACKGROUND OF THE INVENTION
When the rotor of a motor rotates, the active force exerted by the air on the vane attached to the rotor or changes in the direction of the electromagnetic force exerted on the rotor can make the rotor fluctuate or vibrates up and down. This causes the problems of noises, worn-out parts, or the like.
Referring to
FIG. 4
that is a schematic view showing a conventional combination of a rotor structure and a stator. The rotor structure comprises a rotor case
41
, a magnet
3
, and a vane shell
4
. The vane shell is substantially in the shape of a cup, with a plurality of blades formed around its outer side. The rotor case
41
is also in the shape of a cup and provided on the inner side of the vane shell
4
. The magnet
3
is installed within the rotor case
41
. The stator comprises a coil
5
and a silicon steel set
6
. The rotor is coupled to the bearing
8
in the stator by the shaft
7
. When the coil
5
of the stator is energized by a current, magnetic force is generated via the silicon steel set
6
and the magnet
3
of the rotor to cause the rotor to rotate.
The rotor case
41
and the magnet
3
keep a saturation state of magnetic balance. The magnetic field generated by the coil
5
induces a magnetic force on the magnet
3
, but essentially has no magnetic interaction with the top of the rotor case
41
. In other words, the magnetic force generated by the coil
5
has little influence on the rotor in the longitudinal direction of the shaft
7
. The fluctuation or vibration of the rotor usually has been alleviated by an elastic member, such as a C clasp, a spring, or the like. Yet this type of design can only keep the static balance of the rotor. When the rotor rotates, there are still problems such as noise and wear of the C clasp.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide a rotor balance structure that can alleviate the fluctuation and up-and-down vibration of the rotor during its rotation.
To achieve the above object, the rotor balance structure of the present invention comprises a vane shell, a rotor case installed on the inner side of said vane shell, and a magnet installed on the inner side of said rotor case. Said rotor balance structure is coupled with a stator comprising a coil and a magnetic conduction silicon steel set. When said coil is provided with an electrical current and generates a magnetic field, said magnet is attracted by said magnetic conduction silicon steel set so as to rotate the rotor balance structure. The feature of the rotor balance structure of the present invention is in that a magnetically conductive plate is included and installed under the inner side of the vane shell top. The magnetically conductive plate does not have any magnetic conduction with the rotor case but has an attractive magnetic interaction with the coil so that the rotational balance of the rotor balance structure can be improved.
According to an aspect of the present invention, there is no magnetic conduction between the magnetically conductive plate and the rotor case, so the magnetically conductive plate can have an increasing axial magnetic force on the coil so as to improve the rotational balance of the rotor. Thus, the situation of rotor floatation and vibration ups and downs while rotating can be improved.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.


REFERENCES:
patent: 5623382 (1997-04-01), Moritan et al.
patent: 5659445 (1997-08-01), Yoshida et al.
patent: 5783884 (1998-07-01), Fujishima et al.
patent: 5994803 (1999-11-01), Jung
patent: 6100618 (2000-09-01), Schoeb et al.

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