KR101701511B1 - Stepping motor - Google Patents

Stepping motor Download PDF

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Publication number
KR101701511B1
KR101701511B1 KR1020100068717A KR20100068717A KR101701511B1 KR 101701511 B1 KR101701511 B1 KR 101701511B1 KR 1020100068717 A KR1020100068717 A KR 1020100068717A KR 20100068717 A KR20100068717 A KR 20100068717A KR 101701511 B1 KR101701511 B1 KR 101701511B1
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South Korea
Prior art keywords
shaft portion
rotary shaft
washer
bearing
elastic member
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KR1020100068717A
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Korean (ko)
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KR20120007923A (en
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박정범
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엘지이노텍 주식회사
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Priority to KR1020100068717A priority Critical patent/KR101701511B1/en
Publication of KR20120007923A publication Critical patent/KR20120007923A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/30—Computing systems specially adapted for manufacturing

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Frames (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Economics (AREA)
  • Manufacturing & Machinery (AREA)
  • Human Resources & Organizations (AREA)
  • Marketing (AREA)
  • Primary Health Care (AREA)
  • Strategic Management (AREA)
  • Tourism & Hospitality (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)

Abstract

Wherein the stepping motor includes a first rotation axis portion and a second rotation axis portion extending in the axial direction of the first rotation axis portion from the center of the end portion of the first rotation axis portion and having a diameter smaller than that of the first rotation axis portion, A rotor including a magnet disposed on the rotor; A stator for accommodating the rotor in a cylindrical shape in which a coil is wound; A bearing including a first bearing coupled to the first rotary shaft and a second bearing coupled to the second rotary shaft; A washer including a first washer interposed between the first bearing and the magnet, and a second washer interposed between the second bearing and the magnet; And an elastic member that is in direct contact with the second washer and the end portion of the first rotating shaft portion facing the second washer.

Description

STEPPING MOTOR

The present invention relates to a stepping motor.

In general, a stepping motor is suitable for converting a rotational motion into a linear reciprocating motion, and is widely used in optical disk drives (ODD), precision control devices, and the like.

The stepping motor includes a tubular stator in which a coil is wound, a magnet disposed on an outer circumferential surface of the rotating shaft, and a housing enclosing a stator and a rotor inserted into the stator.

A rotor is rotated by a magnetic field generated from a stator and a rotor of a stepping motor, and a plurality of washers are arranged around the rotation axis inside the housing to smoothly rotate the rotor and improve the life of the stepping motor.

The washers are disposed between the rotor and other parts of the housing that are in contact with each other. For example, the washers are disposed between the magnets and the bearings inserted in the rotating shaft so as to face both ends of the magnet, and between the elastic member and the magnet provided on the rotating shaft.

Since the washers disposed on the rotary shaft are in contact with the bearings and the elastic members, the rotary shaft is continuously worn by contact with the rotary members when the rotary shaft rotates, thereby deteriorating the life of the stepping motor.

In addition, since the conventional stepping motor is provided with at least three washers on the rotary shaft, the cost of the product is increased, and the time required for assembling the product is increased, thereby deteriorating the productivity of the product.

The present invention provides a stepping motor in which the number of washers disposed around the rotation axis is reduced to improve the durability life and product productivity and reduce the cost of the product.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In one embodiment, the stepping motor includes a rotation axis including a first rotation axis portion and a second rotation axis portion extending in the axial direction of the first rotation axis portion from a center of an end of the first rotation axis portion and having a smaller diameter than the first rotation axis portion, A rotor including a magnet disposed on the first rotary shaft; A stator for accommodating the rotor in a cylindrical shape in which a coil is wound; A bearing including a first bearing coupled to the first rotary shaft and a second bearing coupled to the second rotary shaft; A washer including a first washer interposed between the first bearing and the magnet, and a second washer interposed between the second bearing and the magnet; And an elastic member that is in direct contact with the second washer and the end portion of the first rotating shaft portion facing the second washer.

In another embodiment, the stepping motor includes a first rotating shaft portion, a second rotating shaft portion extending in the axial direction of the first rotating shaft portion from a center of an end of the first rotating shaft portion and having a smaller diameter than the first rotating shaft portion, A rotor including a rotating shaft including a third rotating shaft portion extending in the axial direction of the second rotating shaft portion from a center of an end of the rotating shaft portion and having a smaller diameter than the second rotating shaft portion, and a magnet disposed in the second rotating shaft portion; A stator for accommodating the rotor in a cylindrical shape in which a coil is wound; A bearing including a first bearing coupled to the first rotary shaft and a second bearing coupled to the third rotary shaft; A washer including a first washer interposed between the first bearing and the magnet, and a second washer interposed between the second bearing and the magnet; And an elastic member that is in direct contact with the second washer and the end portion of the second rotating shaft portion facing the second washer.

According to the stepping motor of the present invention, the diameter of the rotary shaft portion of the portion of the rotary shaft of the stepping motor that fits in the shaft hole of the magnet is set to be larger than the diameter of the elastic member, and the diameter of the rotary shaft portion to which the elastic member and the second bearing are coupled, So that the elastic member is prevented from coming into direct contact with the magnet, thereby removing the washer between the elastic member and the magnet, thereby improving the durability life and the productivity of the product and reducing the cost of the product .

1 is a perspective view of a stepping motor according to an embodiment of the present invention.
2 is a cross-sectional view taken along line II 'of FIG.
3 is an enlarged view of a portion 'A' in FIG.
4 is a cross-sectional view of a stepping motor according to another embodiment of the present invention.
5 is an enlarged view of a portion 'B' in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

1 is a perspective view of a stepping motor according to an embodiment of the present invention. 2 is a cross-sectional view taken along line I-I 'of FIG. 3 is an enlarged view of a portion 'A' in FIG.

1 to 3, the stepping motor 110 includes a rotor 10, a stator 20, first and second bearings 30 and 40, first and second washers 50 and 60, And an elastic member (90). In addition, the stepping motor further includes a housing 25.

The rotor (10) includes a rotating shaft (5) and a magnet (9).

The rotary shaft 5 includes a lead screw shaft portion 1, a first rotary shaft portion 2 and a second rotary shaft portion 3.

A screw thread is formed on the outer peripheral surface of the lead screw shaft portion 1. The first rotary shaft portion 2 is formed integrally with the lead screw shaft portion 1 and the first rotary shaft portion 2 is formed with a first diameter. The second rotary shaft portion 3 is integrally formed with the first rotary shaft portion 2 and extends from the center of the end portion of the first rotary shaft portion 2 in the axial direction of the first rotary shaft portion 2. [ The diameter of the second rotary shaft portion (3) is formed to be a second diameter smaller than the first diameter.

The magnet 9 is disposed in the first rotary shaft portion 2 of the rotary shaft 5 and the magnet 9 is formed in a cylindrical shape in which the hollow 7 is formed. A shaft (8) is formed at one end of the magnet (9).

The stator 20 is formed in a cylindrical shape for housing the rotor 10.

The stator 20 includes a bobbin 12, a coil 14 and a tooth yoke 16.

The bobbin 12 is formed in a cylindrical shape, and both ends of the bobbin 12 have a shape bent outward so as to wind the coil 14.

The coil 14 is wound on the outer peripheral surface of the bobbin, and a magnetic field is generated from the coil 14 by a drive signal applied to the coil 14.

Two tooth yokes 16 are coupled to one bobbin 12. The two tooth yokes 16 each include a tooth yoke portion protruding in a comb shape and the tooth yoke portion of the two tooth yokes 16 extends from both ends of the bobbin 12 to the inner side of the bobbin 12 And are interdigitally engaged on the inner surface of the bobbin 12. A portion of the tooth yokes 16 covers the side of the bobbin 12 and the coil 14 wound on the bobbin 12.

In one embodiment of the present invention, two stators, including the bobbin 12, the coil 14 and the tooth yoke 16, are arranged side-by-side in series.

A hollow is formed inside the stator 20 by the toothed yoke 16 of the stator 20 and the rotor 10 is inserted into the hollow formed inside the stator 20. As a result, the magnet 9 of the rotor 10 and the tooth yoke 16 of the stator 20 are disposed to face each other.

A gap is formed between the tooth yoke 16 of the stator 20 and the magnet 9 of the rotor 10. [ When the tooth yoke 16 and the magnet 9 are not concentric, the rotational torque for rotating the rotor 10 may be reduced or the rotor 10 may not be rotated.

The first and second bearings 30 and 40 serve to rotatably support the rotary shaft 5 of the rotor 10.

The first bearing 30 is disposed at a position facing the one end of the magnet 9 coupled to the rotary shaft 5 in a plate shape. Specifically, the first bearing 30 is rotatably inserted into the first rotary shaft portion 2 of the rotary shaft 5.

The first bearing 30 includes a first bearing portion 32 and a first plate 34.

The first bearing portion 32 is formed in a bushing shape, and the first plate 34 is formed in a disc shape. The first plate 34 is formed with a first coupling hole 36 into which the first bearing portion 32 is inserted and the first plate 34 is connected to the first bearing portion 32 ). The first bearing portion 32 may be formed of a metal.

The second bearing (40) is disposed at the other end opposite to one end of the magnet (9) coupled to the rotating shaft (5). Specifically, the second bearing (40) is rotatably coupled to the second rotary shaft portion (3) of the rotary shaft (5).

The second bearing (40) includes a second bearing portion (42) and a second plate (44).

The second bearing portion 42 is formed in a bushing shape, and the second plate 44 is formed in a disk shape. The second plate 44 is formed with a second coupling hole 46 through which the second bearing portion 42 is inserted and the second plate 44 is coupled with the second bearing portion 42 through the second coupling hole 46 ). The second bearing portion 42 may be formed of a metal.

The first and second washers (50, 60) improve the life and performance of the stepping motor (110).

2, the first washer 50 is formed in a ring shape having a hole at a center thereof to which the first rotary shaft portion 2 is fitted. The first washer 50 is a ring- (30) and one end of the magnet (9).

Referring to FIG. 3, a wear-resistant coating film 70 is formed on the surface of the first washer 50 to improve the life of the first washer 50. The abrasion-resistant coating film 70 may include, for example, PTFE (Polytetrafluoroethylene) -based resin.

The second washer 60 has a ring shape in which a hole for fitting the second rotary shaft portion 3 is formed at the center and a second washer 60 is formed in a ring shape in which the second bearing 40 and the magnet 9 and the other end opposite to the one end.

In order to prevent noise from being generated when the rotor 10 rotates due to contact between the second washer 60 and the elastic member 90 which will be described later, the elastic member 90 A noise-preventing coating film 80 is formed on the surface of the light-

The noise preventing coating film 80 can be formed by coating a PTFE (Polytetrafluoroethylene) based resin, for example.

2, the elastic member 90 is disposed in the second rotary shaft portion 3 and is disposed between the end portions of the first rotary shaft portion 2 facing the second washer 60 and the second washer 60 The elastic member 90 is interposed and the elastic member 90 pushes the rotor 10 in the direction of the first bearing 30. [

The elastic member 90 is formed in a helical shape so that the diameter of the elastic member 90 is smaller than the diameter of the first rotary shaft portion 2 so that the elastic member 90 is in contact with the second bearing 40 and the first It is in direct contact with the end portion of the rotary shaft portion 2 and is not in contact with the magnet 9. Therefore, it is not necessary to dispose the washer between the first rotary shaft portion 2 and the elastic member 90. That is, since the elastic member 90 made of a metal and the first rotary shaft portion 2 made of a metal material are in direct contact with each other, the first rotary shaft portion 2 serves as a washer. Therefore, the elastic member 90 and the first rotary shaft portion 2).

2, an anti-noise coating layer 85 is additionally formed at the end of the first rotary shaft portion 2 to which the elastic member 90 contacts, and the first rotation axis portion 2 is formed by the anti- And the elastic member 90 can be reduced or suppressed.

The housing 25 includes a first housing 25a and a second housing 25b.

The first housing 25a and the second housing 25b are each formed into a cylindrical shape having open ends at both ends and the first and second housings 25a and 25b are coupled to the stator 20.

4 is a cross-sectional view of a stepping motor according to another embodiment of the present invention. 5 is an enlarged view of a portion 'B' in FIG. The stepping motor has substantially the same configuration as the stepping motor shown in FIG. 2 except for the position where the second bearing and the second washer are disposed on the rotation axis and the rotation axis of the stepping motor according to the embodiment of the present invention. Therefore, redundant description of the same configuration will be omitted, and the same reference numerals and the same names will be given to substantially the same configurations.

4 and 5, the rotary shaft 5 of the stepping motor 110 is connected to the lead screw shaft portion 1, the first rotary shaft portion 2, the second rotary shaft portion 3 and the third rotary shaft portion 4, .

A screw thread is formed on the outer peripheral surface of the lead screw shaft portion 1. The first rotary shaft portion 2 is formed integrally with the lead screw shaft portion 1 and the first rotary shaft portion 2 is formed with a first diameter.

The second rotary shaft portion 3 is integrally formed with the first rotary shaft portion 2 and extends from the center of the end portion of the first rotary shaft portion 2 in the axial direction of the first rotary shaft portion 2. [ The diameter of the second rotary shaft portion (3) is formed to be a second diameter smaller than the first diameter.

The third rotary shaft portion 4 is integrally formed with the second rotary shaft portion 3 and extends from the center of the end portion of the second rotary shaft portion 3 in the axial direction of the second rotary shaft portion 3. [ The diameter of the third rotary shaft portion 4 is formed to be a third diameter smaller than the second diameter.

The second bearing 40 is disposed at the other end opposite to one end of the magnet 9 coupled to the rotary shaft 5, if the rotary shaft includes the first to third rotary shafts. Specifically, the second bearing 40 is rotatably coupled to the third rotary shaft portion 4 of the rotary shaft 5.

The second washer 60 is interposed between the second bearing 40 of the third rotary shaft 4 and the other end of the magnet 9 and specifically between the second bearing 40 and the elastic member 90 .

5, an end portion of the first rotating shaft 2 formed of metal and an elastic member 90 formed of metal are brought into contact with the surface of the elastic member 90 to prevent noise from being generated. 95 may be formed.

The noise preventing coating film 95 is formed of PTFE (Polytetrafluoroethylene) type resin.

Here, when the noise prevention coating film 95 is formed on the surface of the elastic member 90, the noise prevention coating film 80 formed on the surface of the second washer 60 described above may not be formed.

As described above in detail, in order to prevent the elastic member of the stepping motor from directly contacting the magnet, the diameter of the rotating shaft portion of the portion of the rotating shaft which is fitted in the shaft hole of the magnet is made larger than the diameter of the elastic member, The diameter of the rotating shaft portion to which the elastic member is coupled is formed to be smaller than the diameter of the elastic member to remove the washer between the elastic member and the magnet to improve the durability life and product productivity and reduce the cost of the product.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

110 ... stepping motor 10 ... rotor
20 ... stator 30 ... first bearing
40 ... second bearing 50 ... first washer
60 ... second washer 70 ... abrasion resistant coating film
80 ... Noise prevention coating film 90 ... Elastic member

Claims (8)

A first rotary shaft portion and a second rotary shaft portion extending in the axial direction of the first rotary shaft portion from a center of an end of the first rotary shaft portion and having a smaller diameter than the first rotary shaft portion, A rotor including a magnet;
A stator for accommodating the rotor in a cylindrical shape in which a coil is wound;
A bearing including a first bearing coupled to the first rotary shaft and a second bearing coupled to the second rotary shaft;
A washer including a first washer interposed between the first bearing and the magnet, and a second washer interposed between the second bearing and the magnet; And
And an elastic member that is in direct contact with the second washer and the end portion of the first rotating shaft portion facing the second washer,
Wherein the elastic member is a coil spring wound on an outer surface of the second rotary shaft portion in a spiral shape and having a diameter smaller than a diameter of the first rotary shaft portion,
Wherein the first rotating shaft portion and the second rotating shaft portion are integrally formed.
delete The method according to claim 1,
Wherein the elastic member includes a noise-preventing coating film for preventing noise generated while being in contact with the second washer and the first rotating shaft portion. The method of claim 3,
Wherein the anti-noise coating layer comprises a PTFE (Polytetrafluoroethylene) -based resin. The method according to claim 1,
At least one of the elastic member and at least one of the end portions of the first rotary shaft portion that is in direct contact with the elastic member, and at least one of the elastic member and the second washer that is in direct contact with the elastic member. 6. The method of claim 5,
Wherein the anti-noise coating layer comprises a PTFE (Polytetrafluoroethylene) -based resin. The method according to claim 1,
Wherein the first washer comprises a wear-resistant coating film applied to the surface of the first washer. A second rotary shaft portion extending in the axial direction of the first rotary shaft portion from a center of an end of the first rotary shaft portion and having a smaller diameter than the first rotary shaft portion, A rotor including a rotating shaft including a third rotating shaft portion extending in the axial direction of the second rotating shaft portion and having a smaller diameter than the second rotating shaft portion, and a magnet disposed on the second rotating shaft portion;
A stator for accommodating the rotor in a cylindrical shape in which a coil is wound;
A bearing including a first bearing coupled to the first rotary shaft and a second bearing coupled to the third rotary shaft;
A washer including a first washer interposed between the first bearing and the magnet, and a second washer interposed between the second bearing and the magnet; And
And an elastic member that is in direct contact with the second washer and the end portion of the second rotating shaft portion facing the second washer,
Wherein the elastic member is a coil spring having a spiral shape wound on an outer surface of the third rotary shaft portion and having a diameter smaller than a diameter of the second rotary shaft portion,
And the first rotary shaft portion, the second rotary shaft portion, and the third rotary shaft portion are integrally formed.
KR1020100068717A 2010-07-15 2010-07-15 Stepping motor KR101701511B1 (en)

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Application Number Priority Date Filing Date Title
KR1020100068717A KR101701511B1 (en) 2010-07-15 2010-07-15 Stepping motor

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Application Number Priority Date Filing Date Title
KR1020100068717A KR101701511B1 (en) 2010-07-15 2010-07-15 Stepping motor

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KR20120007923A KR20120007923A (en) 2012-01-25
KR101701511B1 true KR101701511B1 (en) 2017-02-01

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170244294A1 (en) * 2014-08-29 2017-08-24 Schlumberger Technology Corporation Equipment including polytetrafluoroethylene

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005020857A (en) 2003-06-25 2005-01-20 Matsushita Electric Ind Co Ltd Stepping motor
JP2005304196A (en) * 2004-04-13 2005-10-27 Canon Inc Stepping motor
JP2007014166A (en) 2005-07-01 2007-01-18 Nidec Copal Corp Stepping motor
JP2007202240A (en) * 2006-01-24 2007-08-09 Nidec Sankyo Corp Motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005020857A (en) 2003-06-25 2005-01-20 Matsushita Electric Ind Co Ltd Stepping motor
JP2005304196A (en) * 2004-04-13 2005-10-27 Canon Inc Stepping motor
JP2007014166A (en) 2005-07-01 2007-01-18 Nidec Copal Corp Stepping motor
JP2007202240A (en) * 2006-01-24 2007-08-09 Nidec Sankyo Corp Motor

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