WO1999044275A1 - Motorized flow rate control valve - Google Patents
Motorized flow rate control valve Download PDFInfo
- Publication number
- WO1999044275A1 WO1999044275A1 PCT/JP1998/000735 JP9800735W WO9944275A1 WO 1999044275 A1 WO1999044275 A1 WO 1999044275A1 JP 9800735 W JP9800735 W JP 9800735W WO 9944275 A1 WO9944275 A1 WO 9944275A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- motor
- control valve
- housing
- flow control
- 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.)
- Ceased
Links
Classifications
-
- 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
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
Definitions
- the present invention relates to an electric flow control valve used for an exhaust gas recirculation control device or the like for reducing N ⁇ of exhaust gas of an internal combustion engine.
- FIG. 1 is a configuration diagram showing an exhaust gas recirculation control device.
- 1 is an engine which is an internal combustion engine
- 2 is an intake pipe through which air taken into the engine 1 flows
- 3 is an intake manifold which branches from the intake pipe 2 and flows air through each cylinder.
- an air cleaner provided upstream of the intake pipe 2
- 5 an injector provided in the intake pipe 2 for injecting fuel, and the air flowing into the intake pipe 2 through the air cleaner 4. Is sucked into the engine 1 together with the fuel supplied by the injector 5.
- Reference numeral 6 denotes a throttle valve that changes the amount of air taken into the engine 1
- reference numeral 7 denotes an idle speed control valve provided in a bypass passage that is a flow path that bypasses the throttle valve 6.
- the air-fuel mixture sucked into the engine 1 is combusted by a spark plug (not shown), and the exhaust gas after combustion passes through an exhaust pipe 8 and is purified by a purifier 9 composed of a three-way catalyst and released to the atmosphere.
- Reference numeral 10 denotes a steppermo-type electric flow control valve which is disposed in an exhaust gas recirculation path as a flow path and controls the flow rate of exhaust gas in the flow path.
- FIG. 1 1 is an electronic control unit, which is a throttle opening sensor that detects the opening of the throttle valve 6 and a pressure sensor that detects the pressure in the intake pipe 2. 13.Electric flow based on information obtained from operating temperature detection means such as a water temperature sensor 14 that detects the cooling water temperature of the engine 1 and an ignition device consisting of an ignition coil 15 and a igniter 16. A control signal is generated at the control valve 10.
- FIG. 2 is a configuration diagram showing the above-mentioned electric flow control valve 10.
- 2 1 is the input port 2 la communicating with the exhaust pipe 8 of the engine 1, the output port 2 lb communicating with the intake pipe 2 of the engine 1, the input port 2 la and the output port 2 1b.
- a valve housing having a return flow path 21c, which is a flow path between the valve housing, 22 is a valve seat provided in the return flow path 21c of the valve housing 21, 23 is an opening of the valve sheet 22.
- the valve element 24 that opens and closes has a valve element 23 attached at one end and reciprocates to open and close the valve element 23.
- the valve shaft serves as a valve rod, and 25 is a valve housing.
- a bush, which serves as a bearing for the valve shaft 24 attached to 21, is a spring holder attached to the other end of the valve shaft 24, which projects outward from the valve housing 21.
- Reference numeral 28 denotes a bracket integrally formed with the housing 21 on the side where the valve shaft 24 protrudes from the valve housing 21, for example, by iron.
- the bracket 28 has a stepped motor 29 side having a truncated cone-shaped concave shape (hereinafter referred to as a concave portion 28a) and having a fixed height.
- a flange portion 2 to which the stepping motor 29 is attached via the motor holder 30 with the spacing member 31 and the mounting screw 32 is provided. 8b is formed.
- the flange portion 28 b has a cross-sectional size that is the minimum necessary for strength capable of supporting the stepping motor 29, or a slightly larger size (for example, an area where the area is required for strength). The size is about twice as large).
- An opening 28c communicating with the concave portion 28a is formed around the flange portion 28b.
- a holder portion 26 is formed by a valve shaft 24 for preventing the deposit from adhering within a range of moving up and down in the bush 25.
- the holder 30 is made of a material having a good thermal conductivity, a lower bearing 33 is attached to the center of the lower part of the hollow space, and a gap 34 is provided between the valve housing and the valve housing.
- the heat radiating fins 35 of the length to be formed are integrally formed, and this configuration reduces transmission of high heat of the exhaust gas to the stepping module 29 side.
- Reference numeral 36 denotes a hollow housing
- reference numeral 37 denotes a low housing.
- the upper part is rotatably supported by a ball 49 and a sleep bearing 38, and the lower part is rotatably supported by a lower bearing 33.
- the magnet 39 is attached to the.
- the center of the mouth 37 is hollow in the vertical direction, and a threaded portion 37a is formed on the inner surface.
- 40 a and 40 b are mounted inside the motor housing 36 so as to face the magnet 39 of the rotor 37, and the bobbins 41 a and 41 b are housed inside.
- Upper and lower yokes, 42 a and 42 b are coils wound on bobbin 4 la
- 42 bl and 42 b 2 are coils wound on bobbin 4 lb
- 43 is upper and lower
- a plate for magnetically separating the yokes 40a and 40b of the motor housing 36 is used to prevent the resin material from entering the rotor insertion portion when the motor housing 36 is formed.
- An intrusion prevention plate 45 provided on the upper part of the inside is supported in a state where it is screwed into the screw part 37a inside the rotor 37, and projects downward from the motor holder 30 and the tip ends up and down.
- the actuator rod is moved to and pressed against the valve shaft 24.
- the actuator rod 45 is connected to the bearing rod of the actuator rod. Since the rotation is prevented by the motor bushing 54, both of which have a rotation preventing action, the motor bushing 54 moves up and down by the rotation of the rotor 37.
- this work rod 45 is provided with a stopper part 45b which is engaged with and disengaged from a stopper part 37b of the mouth 37.
- the above upward movement is regulated.
- 46 is a plate assembled in the recess 37 c provided at the upper end of the mouth 37, and 47 is a recess formed in the intrusion prevention plate 44 on the axis of the mouth 37. Make a ring for ball 49 on ball 46.
- the connector 50 is an SPL pusher for applying a preload to the lower bearing 33, and 51 is a connector for supplying a pulse current to each coil.
- the connector 51 is connected to coils 42 a, 42 a 2, 42 b 1, 42 b 2, which are electrically connected to coils 41 a, 42 b 1, 42 b 2, and a connector housing. 5 la.
- Switching transistors Tr1 to Tr4 are connected between the terminals (1), (3), (4), and (4) and the ground, and one terminal connected to one end of each of the coils 42a1 and 42a2. 2, One terminal ⁇ connected to one end of coils 42b1 and 42b2 is connected to the power supply terminal + B via the switch SW.
- the connector housing 51a and the module housing 36 are integrally formed of a resin material.
- 52 is a coil spring interposed between the spring holder 27 and the bracket 28, and urges the valve shaft 24 upward through the spring holder 27 to push the valve body 23 upward. Hold closed. In this closed state, a gap 53 is formed between the knob shaft 24 and the actuator rod 45, and the valve body 23 is securely held in the closed state.
- the low-speed motor 37 does not rotate around, but rotates only about one rotation. Therefore, first, the upper coil 4 2 a 1, 4 2 When a2 is energized counterclockwise as viewed from above, the upper surface of the coil becomes the N pole, the lower surface of the coil becomes the S pole, and the stay becomes the N pole overnight. Similarly, energize the lower coils 4 2 b 1 and 4 2 b 2, and generate magnetic poles immediately.
- the mouth 37 has a magnet that is subdivided into S and N poles, so it rotates to a stable position in the above stage. Actually, as shown in FIG.
- the phase (PHASE) is sequentially changed to rotate one step at a time.
- the phase changes from 0 ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 0 ⁇ 1
- valve 23 is closed, the phase changes from 0 ⁇ 3 ⁇ 2 ⁇ 1 ⁇ 0 ⁇ 3 Let it.
- the actuator rod 45 which is screwed into the screw part 37a of the mouth 37, is moved downward, for example, in the figure according to the rotation of the rotor 37, and the bracket 28 and the spring holder 2 are moved.
- the valve shaft 24 is moved downward against the elastic force of the coil spring 52 contracted between the valve spring 7 and the valve body 23 to open.
- the energizing phase sequence for the coils 42a1, 42a2, 42b1, 42b2 is changed, the magnetic poles generated during the stay are reversed, and the rotor 37 is opposite to the above. Rotate in the direction. According to the rotation direction of the row 37, the rod 45 moves upward in the figure. For this reason, the valve shaft 24 is moved upward in the drawing by the coil spring 52 to close the valve 23. Then, when the stopper portion 45b hits the stopper portion 37b of the rotor 37, the movement of the actuator load 45 is stopped.
- the ring of the mouth 37 is connected to the plate 46 and the motor housing provided at the end face of the mouth 37.
- Intrusion prevention plate for receiving ball 4 9 Since the recesses 47 and the sleeve bearings 38 are used, the number of parts is large, the assembly is troublesome, and the sleeve bearings 38 are expensive. there were.
- the present invention has been made to solve the above-described problems, and has as its object to reduce the number of parts and cost by eliminating the need for sleeve bearings. Another object of the present invention is to make it possible to easily increase the positioning accuracy of the bearing. Disclosure of the invention
- the present invention relates to an electric motor which reciprocates an actuator rod by operation of a motor and pushes a valve shaft which is normally biased in a closing direction by the actuator rod to open a valve body.
- a holding portion having a centering function of a ball to be held between one end of the rotor and a surface facing the end is provided, so that the sleeve bearing can be eliminated. As a result, it is possible to reduce friction and cost.
- the present invention provides an electric motor that reciprocates an actuator rod by operating a motor, and pushes a valve shaft that is normally urged in a closing direction by the actuator rod to open a valve body.
- a boss that projects from the motor housing to the motor holder side to position and hold the bearing is provided integrally with the motor housing, so that the axis alignment accuracy with the motor housing is improved. Can be easily raised.
- the present invention provides an electric motor that reciprocates an actuator rod by operating a motor and pushes a valve shaft, which is normally urged in a closing direction, by the actuator rod to open a valve body.
- a holding portion having a centering function of a ball to be held between both ends is provided at one end of the rotor and at a surface facing the end, and is protruded from the motor housing to the motor holder side. Since the boss for positioning and holding the bearing is provided integrally with the housing, the sleeve bearing can be eliminated, and the alignment accuracy between the mouth and the stay can be easily increased.
- FIG. 1 is a block diagram showing the exhaust gas recirculation control device
- Fig. 2 is a longitudinal sectional view of a conventional electric flow control valve
- Fig. 3 is a connection diagram of a motor coil
- Fig. 4 is a coil.
- FIG. 5 is a front view of the electric flow control valve according to Embodiment 1 of the present invention
- FIG. 6 is a rear view of the electric flow control valve according to Embodiment 1 of the present invention
- FIG. 8 is a plan view of the motorized flow control valve according to Embodiment 1 of the present invention
- FIG. 5 is a front view of the electric flow control valve according to Embodiment 1 of the present invention
- FIG. 6 is a rear view of the electric flow control valve according to Embodiment 1 of the present invention
- FIG. 10 is an enlarged longitudinal sectional view of Rho
- FIG. 11 is a longitudinal sectional view of an electric flow control valve according to Embodiment 2 of the present invention
- FIG. 12 FIG. 7 is a longitudinal sectional view of an electric flow control valve according to Embodiment 3 of the present invention.
- FIGS. 5 to 10 are diagrams showing an electric flow control valve according to Embodiment 1 of the present invention, where 101 is an input port 10 la communicating with an exhaust pipe 8 of the engine 1, and FIG.
- the output port 10 lb communicating with the intake pipe 2 of the engine 1 and the return flow path 101 c which is the flow path between the input port 101 a and the output port 101 b are connected.
- 102 is a valve sheet provided in the return flow passage 101 c of the valve housing 101
- 103 is a valve element for opening and closing the opening of the valve sheet 102
- Numeral 04 designates a valve element 103 attached to one end, and reciprocates to open and close the valve element 103, and a valve shaft as a valve rod for moving the valve element 103 to a closed position.
- Reference numeral 105 designates a valve housing 101.
- a bush that serves as a bearing for the mounted valve shaft 104, 107 is a spur attached to the other end of the valve shaft 104 projecting outward from the valve housing 101. Is a down Guhoruda.
- Reference numeral 108 denotes a bracket integrally formed with the housing 101 on the side where the valve shaft 104 protrudes from the valve housing 101, for example, by iron.
- This bracket 108 has a stepping motor 109 side which is concave in the shape of a truncated cone (hereinafter referred to as a concave portion 108a) and has a cup shape of a constant height.
- the flange portion 108b to be attached is formed.
- the flange portion 108b has a cross-sectional size that is the minimum required for strength capable of supporting the stepping motor 109, or a slightly larger size (for example, an area is required for strength). The size is about twice the area).
- An opening hole 108c communicating with the concave portion 108a is formed around the flange portion 108b.
- a holder portion 106 for preventing a deposit from adhering is formed in a range in which the valve shaft 104 moves up and down in the bush 105.
- the above-mentioned module holder 110 is made of a material having a good thermal conductivity, a lower bearing 113 is attached to the center of the hollow lower part, and a valve housing is provided between the valve housing and the valve housing.
- the heat dissipating fins 115 having a length forming the gaps 114 are integrally formed, and this configuration reduces the transmission of high heat of the exhaust gas to the stepping motor 109 side.
- 1 16 is a hollow motor housing
- 1 17 is the mouth
- the upper part is rotatably supported by a ball 12 9 at the upper part and the lower bearing 11 13 at the lower part, and magnets on the outer periphery 1 1 9 is installed.
- the central part of the rouge 117 is hollow in the vertical direction, and a screw part 117a is formed on the inner surface.
- 1 2 0 a, 1 2 O b is mounted inside the motor housing 1 16 so as to face the magnet 1 19 of the mouth 1 1 7 and bobbin 1 2 1 a, 1 2
- the upper yoke that houses 1 b, the lower yoke, 1 2 2 al, 1 2 2 a 2 are the coils wound around the bobbin 1 2 1 a, 1 2 2 bl, 1 2 2 b 2 are the bobbins 1 2 lb
- the coil wound on the upper and lower yokes 1 and 2 are magnetically separated from each other, and the upper and lower yokes 1 and 2 are magnetically separated.
- An intrusion prevention plate provided at the top of the module housing 1 16 to prevent intrusion into the roto insertion section. This is an actuating rod that is supported in a screwed state, protrudes downward from the module holder 110, moves upward and downward, and presses against the valve shaft 104.
- This actuator rod 1 2 5 is the bearing of the actuator rod.
- this work load 125 has a stop 125b which is disengaged from the stop 1117b of the drive 1117.
- the above upward movement is regulated.
- 1 26 is a plate provided at the upper end of the roaster 1 17, and the above-mentioned plate 1 26 and the intrusion prevention plate 1 2 4 have a holding portion with a ball ring function of the ball 1 29.
- 1 26 a and 1 2 4 a are formed facing each other.
- Reference numeral 130 denotes an SPL pusher for applying a preload to the bearing 113
- reference numeral 131 denotes a connector for supplying a pulse current to each coil.
- the connector 13 1 has coils 12 2 a l, 12 2 a 2
- terminals 1 to 2 electrically connected to 1 2 2 b 1, 1 2 2 b 2 and power supply terminal + ⁇ , and connector housing 13 1 a.
- Reference numeral 1332 denotes a coil spring interposed between the spring holder 107 and the bracket 108, which urges the valve shaft 104 upward in the figure via the spring holder 107.
- the valve 103 is kept closed. In this closed state, a gap 133 is formed between the valve shaft 104 and the actuator load 125, and the valve body 103 is securely held in the closed state.
- the lower part of the roller 1 17 is supported by the bearing 113, and the upper part is the ball 1 2 9 held by the holding parts 126a and 124a, which have the sensor ring function.
- the actuator rod 125 screwed into the screw part 117a at the center of the rotor moves, for example, downward in the figure to the bracket 1
- the valve shaft 104 downward against the elastic force of the coil spring 13 32 contracted between the coil spring 08 and the spring holder 107 to open the valve body 103.
- the high-temperature engine exhaust gas on the input port 101a side of the valve housing 101 passes through the return flow passage 101c while its flow rate is controlled by the valve body 103.
- the plate 126 provided at one end of the mouth 117 and the intrusion prevention plate provided on the inner surface of the motor housing 116 facing the plate. Abolish the sleeve bearing by forming the holding parts 126a and 124a which have the function of sending the ball 129 between 1 and 4 Can be. As a result, the effect of reducing the friction and the cost can be obtained.
- FIG. 11 is a longitudinal sectional view of an electric flow control valve according to Embodiment 2 of the present invention.
- a boss 1 16a for positioning and holding the bearing 1 13 is provided from the module housing 1 16 to the module holder 110 side.
- 9 are the same as those in FIG. 9, and the same parts are denoted by the same reference numerals, and redundant description will be omitted.
- FIG. 12 is a longitudinal sectional view of an electric flow control valve according to Embodiment 3 of the present invention.
- the bearing 1 13 is positioned and held by the configuration of Embodiment 1 in which the sleeve bearing is eliminated and the boss 1 16 a formed integrally with the housing 1 16.
- This is a combination of the configuration of Embodiment 2 in which the same components as those in Embodiments shown in FIGS. 9 and 11 are denoted by the same reference numerals, and redundant description will be omitted.
- the electric flow control valve according to the present invention has an exhaust gas recirculation path. It controls the flow rate of exhaust gas in the flow passage, and simplifies the motor's bearing structure and improves bearing accuracy.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1998/000735 WO1999044275A1 (en) | 1998-02-24 | 1998-02-24 | Motorized flow rate control valve |
| KR10-1999-7009385A KR100396806B1 (ko) | 1998-02-24 | 1998-02-24 | 전동식 유량제어 밸브 |
| EP98904424A EP0982838B1 (en) | 1998-02-24 | 1998-02-24 | Motorized flow rate control valve |
| DE69837538T DE69837538T2 (de) | 1998-02-24 | 1998-02-24 | Motorisierte durchflussregelventil |
| US09/319,594 US6581903B2 (en) | 1998-02-24 | 1998-02-24 | Electrical flow control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1998/000735 WO1999044275A1 (en) | 1998-02-24 | 1998-02-24 | Motorized flow rate control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999044275A1 true WO1999044275A1 (en) | 1999-09-02 |
Family
ID=14207651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1998/000735 Ceased WO1999044275A1 (en) | 1998-02-24 | 1998-02-24 | Motorized flow rate control valve |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6581903B2 (ja) |
| EP (1) | EP0982838B1 (ja) |
| KR (1) | KR100396806B1 (ja) |
| DE (1) | DE69837538T2 (ja) |
| WO (1) | WO1999044275A1 (ja) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2429321A1 (en) * | 2002-05-22 | 2003-11-22 | Tesma International Inc. | Linear proportional valve |
| DE10325211B4 (de) * | 2003-05-28 | 2006-10-05 | Saia-Burgess Dresden Gmbh | Gasdichter Ventilantrieb mit Motor und Sicherheitsschließfunktion |
| JP4531359B2 (ja) * | 2003-07-18 | 2010-08-25 | 三菱電機株式会社 | モータ |
| EP1846683B1 (en) * | 2005-02-08 | 2009-11-25 | Parker Hannifin Corporation | Electric motor driven valve assembly having stator sealing |
| US20060214127A1 (en) * | 2005-03-25 | 2006-09-28 | Ali Shajii | Parallel plate valve assembly |
| WO2007127949A2 (en) | 2006-04-27 | 2007-11-08 | Sko Flo Industries, Inc. | Flow control valve |
| WO2007127986A2 (en) * | 2006-04-28 | 2007-11-08 | Sko Flo Industries, Inc. | Flow measuring apparatus including a piston movable in the flow barrel |
| GB0905710D0 (en) * | 2009-04-02 | 2009-05-20 | Rolls Royce Goodrich Engine Co | Staging valve |
| JP5965712B2 (ja) * | 2012-04-25 | 2016-08-10 | 株式会社不二工機 | 電動弁用駆動モータのステータ |
| GB2508868A (en) * | 2012-12-13 | 2014-06-18 | Johnson Electric Sa | Suspension system for the rotor of a linear actuator |
| DE102014109247B4 (de) * | 2014-07-02 | 2019-06-19 | Pierburg Gmbh | Modular aufgebautes Regelventil |
| TWM604078U (zh) * | 2020-07-30 | 2020-11-11 | 第一傳動科技股份有限公司 | 具有線材保護機制的電動推桿 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62117373U (ja) * | 1986-01-20 | 1987-07-25 | ||
| JPS6454773U (ja) * | 1987-09-30 | 1989-04-04 | ||
| JPH0556622A (ja) * | 1991-08-28 | 1993-03-05 | Seiko Epson Corp | リードスクリユウ型ステツピングモータ |
| JPH06303757A (ja) * | 1993-04-13 | 1994-10-28 | Seiko Epson Corp | Pm型ステッピングモータ |
| JPH08266034A (ja) * | 1995-03-23 | 1996-10-11 | Tec Corp | 直動形ステッピングモーター |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2229969A (en) * | 1938-09-30 | 1941-01-28 | Gen Electric | Enclosed ball bearing |
| DE2716573A1 (de) * | 1977-04-14 | 1978-10-19 | Fritz Stahlecker | Lagerung fuer den spinnrotor eines offenend-spinnaggregates |
| JPS62136680U (ja) * | 1986-02-21 | 1987-08-28 | ||
| DE4128110A1 (de) * | 1991-08-24 | 1993-02-25 | Swf Auto Electric Gmbh | Elektromotor mit an der ankerwelle angebrachter schnecke |
| JPH05176520A (ja) * | 1991-12-25 | 1993-07-13 | Matsushita Electric Ind Co Ltd | ステッピングモータの軸受構造 |
| JP2978677B2 (ja) | 1993-07-07 | 1999-11-15 | 三菱電機エンジニアリング株式会社 | 電動制御弁装置 |
| JP3546469B2 (ja) | 1994-06-03 | 2004-07-28 | 三菱電機株式会社 | 流量弁制御装置 |
| DE4427312A1 (de) * | 1994-08-02 | 1996-02-08 | Bosch Robert Gmbh & Co Kg | Antriebsaggregat mit einem elektrischen Antriebsmotor und einem diesem nachgeordneten Schneckengetriebe |
| JPH08163856A (ja) * | 1994-12-07 | 1996-06-21 | Asmo Co Ltd | ステッピングモータを用いた駆動装置 |
| US5811903A (en) * | 1995-09-26 | 1998-09-22 | Sankyo Seiki Mfg. Co., Ltd. | Motor |
| KR100247356B1 (ko) * | 1996-11-09 | 2000-03-15 | 윤종용 | 모터 |
-
1998
- 1998-02-24 DE DE69837538T patent/DE69837538T2/de not_active Expired - Lifetime
- 1998-02-24 WO PCT/JP1998/000735 patent/WO1999044275A1/ja not_active Ceased
- 1998-02-24 KR KR10-1999-7009385A patent/KR100396806B1/ko not_active Expired - Lifetime
- 1998-02-24 EP EP98904424A patent/EP0982838B1/en not_active Expired - Lifetime
- 1998-02-24 US US09/319,594 patent/US6581903B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62117373U (ja) * | 1986-01-20 | 1987-07-25 | ||
| JPS6454773U (ja) * | 1987-09-30 | 1989-04-04 | ||
| JPH0556622A (ja) * | 1991-08-28 | 1993-03-05 | Seiko Epson Corp | リードスクリユウ型ステツピングモータ |
| JPH06303757A (ja) * | 1993-04-13 | 1994-10-28 | Seiko Epson Corp | Pm型ステッピングモータ |
| JPH08266034A (ja) * | 1995-03-23 | 1996-10-11 | Tec Corp | 直動形ステッピングモーター |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0982838A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010006301A (ko) | 2001-01-26 |
| US20020008219A1 (en) | 2002-01-24 |
| EP0982838A4 (en) | 2001-06-27 |
| DE69837538T2 (de) | 2007-12-20 |
| EP0982838A1 (en) | 2000-03-01 |
| US6581903B2 (en) | 2003-06-24 |
| EP0982838B1 (en) | 2007-04-11 |
| DE69837538D1 (de) | 2007-05-24 |
| KR100396806B1 (ko) | 2003-09-02 |
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