U.S. patent application number 11/343633 was filed with the patent office on 2007-08-02 for damping structure for a rotor assembly of a motor.
This patent application is currently assigned to Zhongshan Broad-Ocean Motor Co., Ltd.. Invention is credited to Rong-Hua Bi.
Application Number | 20070177978 11/343633 |
Document ID | / |
Family ID | 38322260 |
Filed Date | 2007-08-02 |
United States Patent
Application |
20070177978 |
Kind Code |
A1 |
Bi; Rong-Hua |
August 2, 2007 |
Damping structure for a rotor assembly of a motor
Abstract
A damping structure for a rotor assembly includes holes adapted
to be defined in an outer periphery of the inner rotor and in an
inner periphery of the outer rotor respectively and damping
elements inserted into the gap between the inner rotor and the
outer rotor. Each damping element is received in a corresponding to
one of the holes of the inner rotor and the outer rotor so as to
absorb vibration from the outer rotor.
Inventors: |
Bi; Rong-Hua; (Shalang Town,
CN) |
Correspondence
Address: |
Thomas E. Sisson;Jackson Walker, LLP
Suite 2100
112 E. Pecan
San Antonio
TX
78205
US
|
Assignee: |
Zhongshan Broad-Ocean Motor Co.,
Ltd.
|
Family ID: |
38322260 |
Appl. No.: |
11/343633 |
Filed: |
January 31, 2006 |
Current U.S.
Class: |
416/134A |
Current CPC
Class: |
H02K 1/30 20130101; H02K
7/003 20130101; F16F 15/124 20130101 |
Class at
Publication: |
416/134.00A |
International
Class: |
B64C 27/50 20060101
B64C027/50 |
Claims
1. A damping structure for a rotor assembly having an inner rotor
and an outer rotor incorporated with an axle extending through the
inner rotor and the outer rotor, the damping structure comprising:
a gap adapted to be defined between the inner rotor and the outer
rotor; holes adapted to be defined in an outer periphery of the
inner rotor and in an inner periphery of the outer rotor
respectively; and damping elements inserted into the gap and each
received in a corresponding one of the holes of the inner rotor and
the outer rotor so as to absorb vibration from the outer rotor.
2. The damping structure as claimed in claim 1, wherein the damping
elements include a plurality of damping blocks.
3. The damping structure as claimed in claim 1, wherein the damping
elements include a rubber ring with apertures to correspond to the
holes of the inner rotor and the outer rotor respectively and
damping pins respectively inserted into a corresponding one of the
apertures and the holes of the inner rotor and the outer rotor.
4. The damping structure as claimed in claim 3, wherein the damping
pin has a diameter larger than a diameter of the corresponding
aperture such that insertion of the damping pins into the apertures
expands dimension of the apertures and a damping effect is provided
between the inner rotor and the outer rotor.
5. The damping structure as claimed in claim 3, wherein shape of
the hole is circular.
6. The damping structure as claimed in claim 3, wherein shape of
the hole is rectangular.
7. The damping structure as claimed in claim 3, wherein a quantity
of the holes is between 2.about.60.
8. The damping structure as claimed in claim 4, wherein a quantity
of the holes is between 2.about.60.
9. The damping structure as claimed in claim 5, wherein a quantity
of the holes is between 2.about.60.
10. The damping structure as claimed in claim 6, wherein a quantity
of the holes is between 2.about.60.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a damping structure, and
more particularly to a damping structure for a rotor assembly of a
motor so that the vibration of the rotor assembly resulted from the
high frequency resonance of current is reduced.
[0003] 2. Description of the Prior Art
[0004] A rotor assembly and an axle of a motor are two isolated
parts. When the axle is extended into the rotor assembly, there is
no connector sandwiched therebetween. Therefore, when the rotor
assembly is rotated due to the induced current from the variation
of magnetic field, the rotation of the rotor assembly is not smooth
due to the high frequency resonance of the induced current. As
such, the operation of the axle generates noises and may even cause
hazardous resonance. Adding damping elements between the rotor
assembly and the axle does do the job of reducing the noise.
However, the damping elements are complicated and expensive
[0005] To overcome the shortcomings, the present invention tends to
provide an improved damping structure to mitigate the
aforementioned problems.
SUMMARY OF THE INVENTION
[0006] The primary objective of the present invention is to provide
a damping structure for a rotor assembly of a motor to damp out the
vibration caused by the high frequency resonance of current.
[0007] In one aspect of the present invention, the damping
structure of the present invention includes multiple first holes
defined in an outer periphery of an inner rotor, second holes
defined in an inner periphery of an outer rotor and damping
elements respectively inserted into the first holes and the second
holes.
[0008] In yet another objective of the present invention, the
damping elements are connected to one another via a rubber
ring.
[0009] A further objective of the present invention is that a
rubber ring sandwiched between the inner rotor and the outer rotor
has holes to receive therein damping pins each having a diameter
larger than that of the hole so that the holes of the rubber ring
are expanded by the insertion of the damping pins to accomplish the
purpose of shock absorbing.
[0010] Other objects, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a schematic side plan view showing parts of the
damping structure of the present invention to be applied to a rotor
assembly which has an axle extending through the damping
assembly;
[0012] FIG. 2 is a schematic cross sectional view showing the
assembly of the damping structure with the rotor assembly;
[0013] FIG. 3 is a cross sectional view taken from line 3-3 of FIG.
2; and
[0014] FIG. 4 is a schematic cross sectional view showing a
different embodiment of the damping structure.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0015] With reference to FIGS. 1 and 2, it is noted that the
damping structure in accordance with the present invention is
applied to a rotor assembly including an inner rotor (2) and an
outer rotor (3) incorporated with an axle (1) extending through the
inner rotor (2) and the outer rotor (3). A gap (6) is defined
between the inner rotor (2) and the outer rotor (3). Multiple holes
(4) are respectively defined in an outer periphery of the inner
rotor (2) and in an inner periphery of the outer rotor (3) so as to
receive therein a damping element, as shown in FIG. 3. In one
preferred embodiment of the present invention, the damping element
may be a rubber block (5), as shown in FIG. 4. In a different
embodiment of the present invention, the damping element may be a
rubber ring (10) having apertures (7) which are defined in the
rubber ring (10) to receive therein a damping pin (8) and to
correspond to the holes (4) of the inner rotor (2) and the outer
rotor (3) respectively. The quantity of the holes (4) of the inner
rotor (2) and the outer rotor (3) is between 2.about.60. The shape
of the hole (4) may be circular or rectangular such that the shape
of the damping element may also be circular or rectangular to match
the shape of the holes (4). Also, the holes (4) of the inner rotor
(2) may or may not communicate with the holes (4) of the outer
rotor (3) so that different embodiments of the present invention
are applied to adapt to the variation of the communication status
of the holes (4) of the inner rotor (2) and the outer rotor (3). A
connection plate (9) is provided at ends of the inner rotor (2) and
of the outer rotor (3) to secure position of the inner rotor (2)
and the outer rotor (3).
[0016] Preferably, the diameter of the damping pin (8) is larger
than that of the aperture (7) such that after the damping pin (8)
is inserted into a corresponding one of the apertures (7), the
aperture (7) is expanded in dimension and the rubber ring (10) is
deformed so that a damping effect is able to provide between the
inner rotor (2) and the outer rotor (3).
[0017] As a consequence of the provision of the damping structure
to the rotor assembly, it is noted that when the outer rotor (3) is
rotated and vibrated due to the high frequency resonance from the
current, because the damping structure, i.e. the rubber blocks (5)
in the holes (4) or the rubber ring (10) with damping pins (8)
received in the apertures (7), exists between the inner rotor (2)
and the outer rotor (3), the vibration from the outer rotor (3) is
effectively damped so that the force transmitted to the axle (1) is
smooth and thus noise generated by the axle is effectively
reduced.
[0018] It is to be understood, however, that even though numerous
characteristics and advantages of the present invention have been
set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is
illustrative only, and changes may be made in detail, especially in
matters of shape, size, and arrangement of parts within the
principles of the invention to the full extent indicated by the
broad general meaning of the terms in which the appended claims are
expressed.
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