WO2004025814A1 - Reciprocating motor - Google Patents

Reciprocating motor Download PDF

Info

Publication number
WO2004025814A1
WO2004025814A1 PCT/KR2003/001870 KR0301870W WO2004025814A1 WO 2004025814 A1 WO2004025814 A1 WO 2004025814A1 KR 0301870 W KR0301870 W KR 0301870W WO 2004025814 A1 WO2004025814 A1 WO 2004025814A1
Authority
WO
WIPO (PCT)
Prior art keywords
reciprocating motor
stator
locking
inner stator
circumferential surface
Prior art date
Application number
PCT/KR2003/001870
Other languages
French (fr)
Inventor
Seong-Yeol Hyun
Original Assignee
Lg Electronics Inc.
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 Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to BRPI0306303A priority Critical patent/BRPI0306303B1/en
Priority to JP2004535263A priority patent/JP4008924B2/en
Priority to CN038017199A priority patent/CN1602577B/en
Priority to US10/494,952 priority patent/US7285880B2/en
Priority to AU2003261000A priority patent/AU2003261000A1/en
Priority to DE10392332T priority patent/DE10392332T5/en
Publication of WO2004025814A1 publication Critical patent/WO2004025814A1/en
Priority to US11/812,222 priority patent/US7459811B2/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
    • F16B21/18—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details
    • F16B21/186—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details external, i.e. with contracting action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • a flux is formed around the winding coil 8, forming a closed loop along the outer stator 4 and the inner stator 6.
  • the magnet 10 is linearly moved in an axial direction by the interaction of the flux formed between the outer stator 4 and the inner stator 6 and the flux formed by the magnet 10. Also, when the direction of the electric current applied to the winding coil 8 is alternately changed, the flux direction of the winding coil 8 is changed so that the magnet 10 is linearly and reciprocally moved.
  • the elastic support portion 56 includes a first support portion 58 extended at a certain tilt angle inwardly from the ring portion 54, and a second support portion 60 bent at a certain angle from the first support portion 58 so as to provide an elastic force in such a direction that the first support portion

Abstract

A reciprocating motor includes: an outer stator (4) in a support frame (2); an inner stator (6) disposed at the inner circumferential surface of the outer stator (4) with a certain air gap and mounted at the outer circumferential surface of a cylinder (16); a magnet (10) disposed to be linearly movable between the outer stator (4) and the inner stator (6) driven by the winding coil (8) due to move the piston (18); and the locking unit (30, 32), installed at the lateral face of the inner stator (6) for preventing the inner stator (6) from moving in an axial direction. Therefore, the reciprocating motor can improve reliability of a motor by preventing an inner stator (6) from moving in an axial direction by vibration caused by linear movement of the magnet (10).

Description

RECIPROCATING MOTOR
TECHNICAL FIELD
The present invention relates to a reciprocating motor and, more particularly, to a reciprocating motor capable of preventing a stator from moving in an axial direction.
BACKGROUND ART
In general, a reciprocating motor includes an outer stator and an inner stator which are disposed with a certain interval therebetween and a magnet frame having a magnet deposed between the outer stator and the inner stator, so that when power is applied to a winding coil wound around the stator, the magnet frame is linearly and reciprocally moved by an interaction of the stator and the magnet frame. The reciprocating motor is commonly used for a reciprocating compressor, and as its piston and the magnet frame are connected, the piston is reciprocally moved.
Figure 1 is a sectional view of a conventional reciprocating motor, and Figure 2 is a sectional view taken along line ll-ll of Figurel .
The conventional reciprocating motor includes an outer stator 104 in a cylindrical form with a plurality of thin lamination sheets laminated and a winding coil 102 wound therein, an inner stator 106 disposed at an inner circumferential surface of the outer stator 104 with a certain air gap therebetween and having a cylindrical form with a plurality of thin lamination sheets laminated, a magnet 108 disposed in a circumferential direction between the outer stator 104 and the inner stator 106, and a magnet frame 110, at which a plurality of the magnets108 are fixed, being connected to a piston 118 to be reciprocally moved.
The piston 118 is disposed in a cylinder 120 and linearly and reciprocally moved according to the operation of the motor, compressing a fluid.
The outer stator 104 is supported by a support frame 124, and a support ring 114 is inserted at both sides thereof in order to maintain the cylindrical form. Also, the inner stator 106 is fixed at an outer circumferential surface of the cylinder 120 by a press-fit method or an adhesive, and a support ring 116 is inserted at both sides of the inner stator 106 in order to support the plurality of lamination sheets.
The operation of the conventional reciprocating motor will now be described.
When power is applied to the winding coil 102, a flux is formed around the winding coil 102, forming a closed loop along the outer stator 104 and the inner stator 106. The magnet is linearly moved to an axial direction by the interaction of the flux formed between the outer stator 104 and the inner stator 106 and the flux formed by the magnet 108. When the direction of the electric current is changed alternately, the flux direction of the winding coil 102 is changed so that the magnet 108 is linearly and reciprocally moved.
According to the movement of the magnet 108, the magnet frame 110 to which the magnet 108 is fixed is linearly and reciprocally moved, and thus, the piston 118 is linearly and reciprocally moved.
However, the conventional art has a problem that because the inner stator 106 is fixed at the outer circumferential surface of the cylinder 120 by the press-fit method, the inner stator 106 is moved along with the magnet 108 in the axial direction by the vibration generated when the magnet 108 is moved reciprocally.
In addition, in the case that the inner stator 106 is fixed at the outer circumferential surface of the cylinder 120 by the adhesive and so on, an assembly operation is not easy.
DISCLOSURE OF THE INVENTION
Therefore, it is an object of the present invention to provide a reciprocating motor capable of improving reliability of a motor by preventing an inner stator from moving in an axial direction caused by vibration of a linearly moved magnet as the motor is used for a long time.
To achieve the above object, there is provided a reciprocating motor including: an outer stator; an inner stator disposed at an inner circumferential surface of the outer stator with an air gap therebetween and mounted at an outer circumferential surface of a cylinder; a magnet disposed to be linearly movable between the outer stator and the inner stator; and a locking unit installed at the lateral face of the inner stator and preventing the inner stator from moving in an axial direction.
The locking unit includes a locking groove formed at the outer circumferential surface of the cylinder in a circumferential direction and a locking ring inserted into the locking groove and adhered closely at the lateral face of the inner stator.
The locking groove is formed in a way that its one side is at a right angle and the other side narrows inwardly, forming a tilt angle. An inner side of the locking ring is inserted into the locking groove and an outer side thereof is supported at the lateral face of the inner stator.
In order to achieve the above object, there is also provided a reciprocating motor including: an outer stator; an inner stator disposed at the inner circumferential surface of the outer stator with a certain air gap and disposed at the outer circumferential surface of a cylinder; a magnet disposed to be linearly movable between the outer stator and the inner stator; and a locking unit consisting of a locking groove formed at the outer circumferential surface of the cylinder in a circumferential direction, and a locking ring elastically supported at the locking groove and at the lateral face of the inner stator to prevent the inner stator from moving in an axial direction.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional view of a conventional reciprocating motor;
Figure 2 is a sectional view taken along line II - II of Figure 1 ; Figure 3 is a sectional view of a reciprocating motor according to a first embodiment of the present invention;
Figure 4 is an enlarged view of a part 'A' of Figure 3 showing a locking unit of an inner stator according to the first embodiment of the present invention; Figure 5 is a sectional view of another case of the locking groove of the locking unit in accordance with the present invention;
Figure 6 is a perspective view of a locking ring according to the first embodiment of the present invention; Figure 7 is a perspective view of a locking ring of a locking unit according to a second embodiment of the present invention; and
Figure 8 is a sectional view of a locking unit according to the second embodiment of the present invention.
MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS
A first embodiment of the present invention will now be described with reference to the accompanying drawings.
There can be a plurality of embodiments of the reciprocating motor in accordance with the present invention, and a preferred embodiment will now be described.
Figure 3 is a sectional view of a reciprocating motor according to the present invention.
The reciprocation motor includes: a cylindrical outer stator 4 fixed at a support frame 2; an inner stator 6 disposed at an inner circumferential surface of the outer stator 4 with a certain air gap therebetween and forming a flux therebetween; a winding coil 8 wound in the outer stator 4 or the inner stator 6; a magnet 10 disposed to be linearly movable between the outer stator 4 and the inner stator 6; a magnet frame 12 connected between the magnet 10 and an element desired to be reciprocally moved and transferring a reciprocal movement of the magnet 10 to the element ; and a locking unit for preventing the inner stator 6 from moving in an axial direction.
In case that the reciprocating motor is applied to a reciprocating compressor, the element is a piston 18, for example, which is moved linearly and reciprocally in the cylinder 16 for a compressing operation.
The outer stator 4 has a cylindrical form as a plurality of lamination sheets are laminated radially in the circumferential direction, and is supported by the support frame 2.
The inner stator 6 has a cylindrical form with a plurality of lamination sheets laminated radially in the circumferential direction, has a support ring 20 inserted at both sides to support the lamination sheets, and is mounted at the outer circumferential surface of the cylinder 16.
That is, the inner circumferential surface of the inner stator 6 is mounted at the outer circumferential surface of the cylinder 16. One side of the inner stator 6 is supported by the support frame 2 or a protruded portion of the cylinder 16, and the other side is supported by the locking unit which prevents the inner stator 6 from moving in an axial direction.
As shown in Figure 4, the locking unit includes a locking groove 30 formed at the outer circumferential surface of cylinder 16 in a circumferential direction and a locking ring 32 inserted into the locking groove 30 and adhered closely to the lateral face 34 of the inner stator 6.
The locking groove 30 is formed at the outer circumferential surface of the cylinder16 in the circumferential direction with a certain width and depth, and has a greater width (N) than a thickness (L) of the locking ring 32 so that the locking ring 32 can be easily inserted thereinto. That is, the width (N) of the locking groove 30 is the sum of the thickness (L) of the locking ring 32 and the inward width (M) from the lateral face 34 of the inner stator 6.
As shown in Figure 4, the locking groove 30 is formed such that both sides 36 and 38 are at a right angle, or such that, as shown in Figure 5, one side 40 is at a right angle and the other surface 42 is at a tilt angle, forming a slant surface with the width of the locking groove 30 becoming narrow inwardly.
In the case that the locking groove 30 has the slant surface, it is easy to insert the locking ring 32, so that the assembling is convenient.
As shown in Figure 6, the inner surface of the locking ring 32 is adhered closely to the side of the locking groove 30 and its outer surface is supported at the lateral face 34 of the inner stator 6. And, an opening portion 34 is formed at the one side of the locking ring 32 to facilitate assembling and has a certain elastic force in the opening direction. That is, in assembling after the opening portion 34 is opened, the locking ring 32 is inserted into the locking groove 30.
The locking ring is formed so that its right and left portions are asymmetrical centering on the opening portion, and is formed so that its right and left portions are asymmetrical centering on the opening portion. Also, at least one of the locking rings is disposed at the locking groove.
The operation of the reciprocating motor according to the present invention will now be described.
When power is applied to the winding coil 8, a flux is formed around the winding coil 8, forming a closed loop along the outer stator 4 and the inner stator 6. The magnet 10 is linearly moved in an axial direction by the interaction of the flux formed between the outer stator 4 and the inner stator 6 and the flux formed by the magnet 10. Also, when the direction of the electric current applied to the winding coil 8 is alternately changed, the flux direction of the winding coil 8 is changed so that the magnet 10 is linearly and reciprocally moved.
Then, as the magnet frame 12 with the magnet 10 fixed thereto is linearly and reciprocally moved, an element such as the piston 18 is linearly reciprocally moved.
At this time, the locking unit prevents the inner stator 6 disposed at the outer circumferential surface of the cylinder 16 from moving in the axial direction which is caused by the vibration generated during the linear and reciprocating movement of the magnet 10. That is, the axial movement of the inner stator 6 in the axial direction is prevented because the locking ring 32 is adhered closely to the lateral face 34 of the inner stator 6 in a state of being inserted in the locking groove 30 formed at the outer circumferential surface of the cylinder 16.
Figure 7 is perspective view of the locking ring of a locking unit according to a second embodiment of the present invention, and Figure 8 is a sectional view of a locking unit according to the second embodiment of the present invention.
A locking unit according to the second embodiment of the present invention includes a locking groove 50 formed at an outer circumferential surface of the cylinder 16 in the circumferential direction, and a locking ring 52 elastically supported in the locking groove 50 and at the lateral face 34 of the inner stator 6 and preventing the inner stator 6 from moving in the axial direction. one side of the locking groove 50 is positioned on the same straight line as the lateral face 34 of the inner stator 6, and the locking groove 50 is formed to have a greater width than a thickness of the locking ring 52.
The locking ring 52 includes a ring portion 54 supported at the lateral face 34 of the inner stator 6 and having an opening portion 62 at the one side thereof and an elastic support portion 56 extended with a certain interval inwardly from the inner circumferential surface of the ring portion 54 so as to be elastically supported in the locking groove 50.
Herein, the elastic support portion 56 includes a first support portion 58 extended at a certain tilt angle inwardly from the ring portion 54, and a second support portion 60 bent at a certain angle from the first support portion 58 so as to provide an elastic force in such a direction that the first support portion
58 and the second support portion 60 are smoothed.
The locking unit according to the second embodiment prevents the inner stator 6 from moving in the axial direction since the ring portion 54 of the support ring 52 is adhered closely to the lateral face 34 of the inner stator 6 and the elastic support portion 56 is elastically supported at the locking groove
50 of the cylinder 16.
As described above, the reciprocating motor in accordance with the present invention can improve reliability of the motor by preventing the inner stator from moving in the axial direction in the way of forming the locking groove at the outer circumferential surface of the cylinder, inserting the locking ring into the locking groove and supporting the locking ring at the lateral face of the inner stator. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A reciprocating motor comprising: an outer stator; an inner stator disposed at an inner circumferential surface of the outer stator with a certain air gap therebetween and at an outer circumferential surface of a cylinder; a magnet disposed to be linearly movable between the outer stator and the inner stator; and a locking unit installed at the side of the inner stator for preventing the inner stator from moving in an axial direction.
2. The reciprocating motor of claim 1 , wherein the locking unit includes a locking groove formed at the outer circumferential surface of the cylinder in the circumferential direction and a locking ring inserted in the locking groove and adhered closely to the side of the inner stator.
3. The reciprocating motor of claim 2, wherein the locking groove is formed such that both sides are a right angle.
4. The reciprocating motor of claim 2, wherein the locking groove is formed such that one side is a right angle, and at least one of the other sides is a tilt angle, forming a slant surface with the width of the locking groove becoming narrow inwardly.
5. The reciprocating motor of claim 2, wherein the locking ring comprises: a ring portion supported at the side of the inner stator; and an elastic support portion extended with a certain interval inwardly from the inner circumferential surface of the ring portion.
6. The reciprocating motor of claim 5, wherein the elastic support portion comprises: a first support part extended at a certain tilt angle inwardly from the ring portion; and a second support portion bent at certain angle from the first support portion so as to provide an elastic force.
7. The reciprocating motor of claim 2, wherein the locking ring has an opening portion, and a certain elastic force is generated when the opening portion is opened.
8. The reciprocating motor of claim 7, wherein the locking ring is formed so that its right and left portions are asymmetrical centering on the opening portion.
9. The reciprocating motor of claim 7, wherein the locking ring is formed so that its thickness becomes thicker, as it goes from the opening portion toward an opposite portion of the opening portion.
10. The reciprocating motor of claim 2, wherein at least one of the locking rings is disposed at the locking groove.
PCT/KR2003/001870 2002-09-10 2003-09-09 Reciprocating motor WO2004025814A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BRPI0306303A BRPI0306303B1 (en) 2002-09-10 2003-09-09 linear motor including a locking groove and a locking ring
JP2004535263A JP4008924B2 (en) 2002-09-10 2003-09-09 Reciprocating motor
CN038017199A CN1602577B (en) 2002-09-10 2003-09-09 Reciprocating motor
US10/494,952 US7285880B2 (en) 2002-09-10 2003-09-09 Reciprocating motor
AU2003261000A AU2003261000A1 (en) 2002-09-10 2003-09-09 Reciprocating motor
DE10392332T DE10392332T5 (en) 2002-09-10 2003-09-09 piston engine
US11/812,222 US7459811B2 (en) 2002-09-10 2007-06-15 Reciprocating motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2002-0054718 2002-09-10
KR10-2002-0054718A KR100469463B1 (en) 2002-09-10 2002-09-10 Union structure for stator in reciprocating compressor

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US10494952 A-371-Of-International 2003-09-09
US11/812,222 Continuation US7459811B2 (en) 2002-09-10 2007-06-15 Reciprocating motor

Publications (1)

Publication Number Publication Date
WO2004025814A1 true WO2004025814A1 (en) 2004-03-25

Family

ID=31987367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2003/001870 WO2004025814A1 (en) 2002-09-10 2003-09-09 Reciprocating motor

Country Status (8)

Country Link
US (2) US7285880B2 (en)
JP (2) JP4008924B2 (en)
KR (1) KR100469463B1 (en)
CN (1) CN1602577B (en)
AU (1) AU2003261000A1 (en)
BR (1) BRPI0306303B1 (en)
DE (1) DE10392332T5 (en)
WO (1) WO2004025814A1 (en)

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EP3899274B1 (en) * 2018-12-18 2023-10-11 ATLAS COPCO AIRPOWER, naamloze vennootschap Piston compressor

Also Published As

Publication number Publication date
DE10392332T5 (en) 2005-09-15
KR20040023096A (en) 2004-03-18
JP2005525778A (en) 2005-08-25
AU2003261000A1 (en) 2004-04-30
US7285880B2 (en) 2007-10-23
JP2007228797A (en) 2007-09-06
JP4008924B2 (en) 2007-11-14
US7459811B2 (en) 2008-12-02
BRPI0306303B1 (en) 2015-09-08
BR0306303A (en) 2004-09-28
US20070241621A1 (en) 2007-10-18
US20040251749A1 (en) 2004-12-16
KR100469463B1 (en) 2005-02-02
CN1602577B (en) 2010-12-08
CN1602577A (en) 2005-03-30

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