US20070177978A1 - Damping structure for a rotor assembly of a motor - Google Patents

Damping structure for a rotor assembly of a motor Download PDF

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Publication number
US20070177978A1
US20070177978A1 US11/343,633 US34363306A US2007177978A1 US 20070177978 A1 US20070177978 A1 US 20070177978A1 US 34363306 A US34363306 A US 34363306A US 2007177978 A1 US2007177978 A1 US 2007177978A1
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US
United States
Prior art keywords
damping
rotor
holes
damping structure
outer rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/343,633
Inventor
Rong-Hua Bi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongshan Broad Ocean Motor Co Ltd
Original Assignee
Zhongshan Broad Ocean Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhongshan Broad Ocean Motor Co Ltd filed Critical Zhongshan Broad Ocean Motor Co Ltd
Priority to US11/343,633 priority Critical patent/US20070177978A1/en
Assigned to ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. reassignment ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BI, Rong-hua
Publication of US20070177978A1 publication Critical patent/US20070177978A1/en
Priority to US12/185,096 priority patent/US7737583B2/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/124—Elastomeric springs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts

Definitions

  • 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.
  • a rotor assembly and an axle of a motor are two isolated parts.
  • the axle 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
  • the present invention tends to provide an improved damping structure to mitigate the aforementioned problems.
  • 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.
  • 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.
  • the damping elements are connected to one another via a rubber ring.
  • 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.
  • 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;
  • FIG. 2 is a schematic cross sectional view showing the assembly of the damping structure with the rotor assembly
  • FIG. 3 is a cross sectional view taken from line 3 - 3 of FIG. 2 ;
  • FIG. 4 is a schematic cross sectional view showing a different embodiment of the damping structure.
  • 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 .
  • the damping element may be a rubber block ( 5 ), as shown in FIG. 4 .
  • 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 ⁇ 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 ).
  • 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 ).
  • 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 ).

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Vibration Prevention Devices (AREA)

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.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • 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.
  • 2. Description of the Prior Art
  • 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
  • To overcome the shortcomings, the present invention tends to provide an improved damping structure to mitigate the aforementioned problems.
    • SUMMARY OF THE INVENTION
  • 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.
  • 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.
  • In yet another objective of the present invention, the damping elements are connected to one another via a rubber ring.
  • 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.
  • 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
  • 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;
  • FIG. 2 is a schematic cross sectional view showing the assembly of the damping structure with the rotor assembly;
  • FIG. 3 is a cross sectional view taken from line 3-3 of FIG. 2; and
  • FIG. 4 is a schematic cross sectional view showing a different embodiment of the damping structure.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • 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˜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).
  • 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).
  • 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.
  • 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.

Claims (10)

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˜60.
8. The damping structure as claimed in claim 4, wherein a quantity of the holes is between 2˜60.
9. The damping structure as claimed in claim 5, wherein a quantity of the holes is between 2˜60.
10. The damping structure as claimed in claim 6, wherein a quantity of the holes is between 2˜60.
US11/343,633 2006-01-31 2006-01-31 Damping structure for a rotor assembly of a motor Abandoned US20070177978A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/343,633 US20070177978A1 (en) 2006-01-31 2006-01-31 Damping structure for a rotor assembly of a motor
US12/185,096 US7737583B2 (en) 2006-01-31 2008-08-03 Vibration-damping rotor assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/343,633 US20070177978A1 (en) 2006-01-31 2006-01-31 Damping structure for a rotor assembly of a motor

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/185,096 Continuation US7737583B2 (en) 2006-01-31 2008-08-03 Vibration-damping rotor assembly

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US20070177978A1 true US20070177978A1 (en) 2007-08-02

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US11/343,633 Abandoned US20070177978A1 (en) 2006-01-31 2006-01-31 Damping structure for a rotor assembly of a motor
US12/185,096 Active US7737583B2 (en) 2006-01-31 2008-08-03 Vibration-damping rotor assembly

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Application Number Title Priority Date Filing Date
US12/185,096 Active US7737583B2 (en) 2006-01-31 2008-08-03 Vibration-damping rotor assembly

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140933A1 (en) * 2009-06-02 2010-12-09 Saab Ab Rotor damper and tail rotor with such a rotor damper
US20150137655A1 (en) * 2013-11-21 2015-05-21 Denso Corporation Rotor securing arrangement and rotating electric machine having the same
WO2019192805A1 (en) * 2018-04-05 2019-10-10 Cpt Zwei Gmbh Rotor for an electric machine with integrated radial and axial vibration absorber

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US8141614B2 (en) * 2009-07-01 2012-03-27 Harmonic Design Expanding coupling means for powered window covering
US8853901B2 (en) * 2010-03-09 2014-10-07 Zhongshan Broad-Ocean Motor Co., Ltd. Motor rotor system having a magnetic ring bracket
US9013074B2 (en) * 2010-05-25 2015-04-21 Regal Beloit America, Inc. Resilient rotor assembly for interior permanent magnet motor
CN201947080U (en) * 2011-01-28 2011-08-24 中山大洋电机制造有限公司 Rotor structure of brushless motor
CN102801244A (en) * 2011-05-27 2012-11-28 珠海格力电器股份有限公司 Vibration-damping rubber pad
US8890384B2 (en) * 2012-09-25 2014-11-18 Nidec Motor Corporation Capless mounting for motor
US20140124231A1 (en) 2012-11-06 2014-05-08 Milwaukee Electric Tool Corporation Electric motor for a power tool
US10432045B2 (en) 2012-11-06 2019-10-01 Milwaukee Electric Tool Corporation Electric motor for a power tool
US9966829B2 (en) 2015-11-24 2018-05-08 Lin Engineering, Inc. Reduced-vibration stepper motor
AU2018241180A1 (en) 2017-10-09 2019-05-02 Hunter Douglas Inc. Rail assemblies for motorized architectural coverings and related methods
CN108566030A (en) * 2018-03-02 2018-09-21 南京好龙电子有限公司 Rotor with torsion damping device and motor
DE102022119704A1 (en) * 2022-08-05 2024-02-08 Vibracoustic Se Electric motor rotor assembly

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US5306123A (en) * 1993-04-08 1994-04-26 General Electric Company Noise isolating rotor for air handler motor
US5704111A (en) * 1995-05-24 1998-01-06 General Electric Company Method for making a rotor for an electric motor
US5767607A (en) * 1996-11-27 1998-06-16 Emerson Electric Co. Weight optimized rotors
US6084330A (en) * 1998-03-13 2000-07-04 Kollmorgen Corporation Permanent magnet rotor and method of assembly
US6133655A (en) * 1996-11-13 2000-10-17 Minebea Co., Ltd. Claw-pole stepping motor with rotor including vibration reducing magnet

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027026A (en) * 1988-04-12 1991-06-25 Kabushiki Kaisha Sankyo Seiki Seisakusho Brushless motor
US5306123A (en) * 1993-04-08 1994-04-26 General Electric Company Noise isolating rotor for air handler motor
US5704111A (en) * 1995-05-24 1998-01-06 General Electric Company Method for making a rotor for an electric motor
US6133655A (en) * 1996-11-13 2000-10-17 Minebea Co., Ltd. Claw-pole stepping motor with rotor including vibration reducing magnet
US5767607A (en) * 1996-11-27 1998-06-16 Emerson Electric Co. Weight optimized rotors
US6084330A (en) * 1998-03-13 2000-07-04 Kollmorgen Corporation Permanent magnet rotor and method of assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140933A1 (en) * 2009-06-02 2010-12-09 Saab Ab Rotor damper and tail rotor with such a rotor damper
US9073636B2 (en) 2009-06-02 2015-07-07 Saab Ab Rotor damper and tail rotor with such a rotor damper
US20150137655A1 (en) * 2013-11-21 2015-05-21 Denso Corporation Rotor securing arrangement and rotating electric machine having the same
US10069361B2 (en) * 2013-11-21 2018-09-04 Denso Corporation Rotor securing arrangement and rotating electric machine having the same
WO2019192805A1 (en) * 2018-04-05 2019-10-10 Cpt Zwei Gmbh Rotor for an electric machine with integrated radial and axial vibration absorber

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Publication number Publication date
US7737583B2 (en) 2010-06-15
US20080284274A1 (en) 2008-11-20

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Date Code Title Description
AS Assignment

Owner name: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BI, RONG-HUA;REEL/FRAME:017524/0406

Effective date: 20060124

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION