WO1997048173A1 - Moteur pas-a-pas et procede d'assemblage - Google Patents

Moteur pas-a-pas et procede d'assemblage Download PDF

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Publication number
WO1997048173A1
WO1997048173A1 PCT/JP1997/002063 JP9702063W WO9748173A1 WO 1997048173 A1 WO1997048173 A1 WO 1997048173A1 JP 9702063 W JP9702063 W JP 9702063W WO 9748173 A1 WO9748173 A1 WO 9748173A1
Authority
WO
WIPO (PCT)
Prior art keywords
yoke
stator
rotor
assembling
stepping motor
Prior art date
Application number
PCT/JP1997/002063
Other languages
English (en)
Japanese (ja)
Inventor
Eiichi Miyashita
Yasuhiro Taguchi
Tadashi Komatsu
Original Assignee
Seiko Epson Corporation
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 Seiko Epson Corporation filed Critical Seiko Epson Corporation
Publication of WO1997048173A1 publication Critical patent/WO1997048173A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
    • H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
    • H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
    • 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 a stepping motor, and more particularly to a stepping motor used for driving a lens for focusing and zooming in an optical device such as a camera or a video camera.
  • a small stepping motor with a lead screw installed on its rotation axis is used for lens driving for focusing and zooming of cameras and video cameras.
  • This type of stepping motor requires low power consumption, the required torque required for driving the lens with the lowest possible input value (current), and the need for high-speed lens driving. Therefore, characteristics such as being able to rotate up to a high frequency range and good angle accuracy are required.
  • FIGS 12 and 13 show the structure of a conventional stepping motor.
  • the conventional steering motor 100 shown in these figures has a stator 120 and a rotor 160 rotatably inserted inside the stator 120.
  • the stator 120 has two sets of an inner yoke 130, an outer yoke 140 and a coil 150 installed between them, and these are provided at the base 13 of the inner yoke 130. They are fixed so that they are joined together.
  • a plurality of magnetic poles 1 3 4 and 1 4 4 are formed on the inner yoke 1 3 0 and the outer yoke 1 4 0, respectively, and the magnetic poles 1 3 4 and 1 4 4 of each yoke 1 3 0 and 1 4 0 are formed.
  • the cylindrical permanent magnets 162 fixed to the rotating shaft 161 of the rotor 160 are alternately arranged along the outer peripheral surface of the cylindrical permanent magnets 161, and are not in contact with each other.
  • the magnetic poles of the inner yoke 130 and the outer yoke 140 face the outer peripheral surface of the permanent magnet 162 of the rotor 160 with a predetermined gap (gear) 170 therebetween.
  • the inner The buck 130 and the outer yoke 140 can be positioned by their own shapes.
  • a step portion 144 is formed inside the end portion of the outer yoke 140 (the side where the inner yokes 130 are joined to each other).
  • the outer edge 1 3 2 of the base 1 3 1 1 3 is engaged with the step 1 4 5
  • the inner yoke 1 3 0 is fitted to the outer yoke 1 4 0, and both yokes 1 3 0
  • the 140 alignment is performed. Therefore, as shown in FIG. 12, the outer peripheral edge 131 of the inner yoke 130 is not exposed in the vicinity of the contact surface 139 of the outer peripheral surface of the stepping motor 100.
  • the outer peripheral edge 1 32 and the step 1 A gap is formed between the inner yoke 140 and the inner yoke 140, making it impossible to accurately fit and fix the inner yoke 130 and the outer yoke 140.
  • An object of the present invention is to provide a stepping motor capable of preventing misalignment between an inner yoke and an outer yoke at the time of assembly with a simple structure, thereby improving various characteristics of a stepping motor, and the like.
  • An object of the present invention is to provide a method of assembling a steering motor that can easily assemble a simple steering motor. Disclosure of the invention
  • the present invention includes a stator having at least one set of an inner yoke, an outer yoke, and a coil disposed therebetween, and a rotor rotatably inserted inside the stator.
  • a plurality of magnetic poles formed on the inner yoke, and a plurality of magnetic poles formed on the outer yoke are arranged alternately along the outer peripheral surface of the rotor. It has a disk-shaped base whose outer diameter is substantially equal to the outer diameter of the outer yoke, and the outer peripheral edge of the base is exposed near the outer peripheral surface of the outer yoke.
  • the stator is formed by fixing two sets of an inner yoke, an outer yoke, and a coil installed therebetween so that the bases of the respective inner yokes are joined to each other.
  • the magnetic poles of the inner yoke and the outer yoke are installed in a non-contact manner with the outer peripheral surface of the rotor and at the same distance from the rotation center of the rotor.
  • the rotor has a permanent magnet, and the outer diameter of the permanent magnet near the base is reduced.
  • a lead screw is provided on the rotating shaft of the rotor.
  • the positioning of the inner yoke and the outer yoke in the first step is performed based on the inner diameter of the stator.
  • the positioning is performed by inserting a jig into a bore of the stator. Preferably.
  • the positioning of the inner yoke and the outer yoke in the first step is performed based on an outer diameter of the stator.
  • the positioning is performed by inserting the stator into a lumen of a jig.
  • connection between the inner yoke and the outer yoke is performed through a hole formed in the jig.
  • a stator having an inner yoke, an outer yoke and a coil installed therebetween, and a rotor, wherein the inner yoke and the outer yoke are positioned by their own shapes. It is a method of assembling a steering wheel that assembles a steering wheel that cannot be adjusted.
  • the positioning of the inner yoke and the outer yoke in the first step is performed on the basis of the inner diameter of the stator or the appearance of the outer yoke.
  • FIG. 1 is a plan view showing an embodiment of the present invention.
  • FIG. 2 is a sectional view taken along the line II-II in FIG.
  • FIG. 3 is an exploded perspective view showing the configuration of the inner yoke and the outer yoke.
  • FIG. 4 is a plan view showing the configuration of the outer yoke.
  • FIG. 5 is a cross-sectional view (end view) taken along line VV in FIG.
  • FIG. 6 is a plan view showing the configuration of the inner yoke.
  • FIG. 7 is a sectional view (end view) taken along line VII-VII in FIG.
  • FIG. 8 is a partial sectional side view showing a method of assembling the steering motor of the present invention
  • FIG. 9 is a partial sectional side view showing a method of assembling the steering motor of the present invention
  • FIG. 4 is a diagram illustrating a relationship between torques.
  • FIG. 11 is a diagram showing the relationship between the driving speed of the steering motor and the self-start current.
  • ⁇ FIG. 12 is a plan view showing the structure of a conventional steering motor.
  • FIG. 13 is a sectional view taken along line XIII-XIII in FIG.
  • FIG. 1 is a plan view showing an embodiment of the stepping motor of the present invention
  • FIG. 2 is a sectional view taken along line II-II in FIG. 1
  • FIG. 3 is an exploded perspective view showing the configuration of an inner yoke and an outer yoke
  • 4 is a plan view showing the configuration of the outer yoke
  • FIG. 5 is a sectional view taken along the line V--V in FIG. 4 (end view)
  • FIG. 6 is a plan view showing the configuration of the inner yoke
  • FIG. The VII-VII line cross section (end view) in the middle In the following description, the right side in FIGS. 1 and 2 is referred to as a “proximal end” and the left side is referred to as a “distal end”.
  • the stepping motor 1 of the present embodiment is a PM type stepping motor, which mainly includes a stator 2 and a rotation inserted rotatably inside the stator 2. Stud 6, bottom plate (cover) 7 fixed to the base end of stator 2, mounting plate 8 fixed to the tip of stator 2, bearings 9 a, 9 b, fixed to mounting plate 8 And a lead screw 14 installed on the rotating shaft 61 of the rotor 6.
  • the stator 2 is composed of a set of inner yoke 3, outer yoke 4, and a core installed between them. Two sets of units composed of the coils 5 are prepared, and these are fixed so that the bases 31 of the inner yokes 3 are joined to each other. Since both units have almost the same structure, one (base end) unit will be representatively described below.
  • the outer yoke 4 is a bottomed cylindrical member made of a soft magnetic material, and has a bottom portion 41 and a cylindrical outer peripheral portion erected from the bottom portion 41. 4 and a plurality of magnetic poles 44 standing from the edge of the opening 43 formed in the center of the bottom 41 in the same direction as the outer periphery 42.
  • Notches 45 and 46 are formed in the outer peripheral portion 42 at positions facing each other via the opening 43.
  • the notch 45 has a terminal portion 53 formed on a bobbin 51 to be described later inserted therethrough and protrudes outward.
  • the notch 46 has a positioning protrusion 5 4 formed on the bobbin 51. Are fitted, whereby the bobbin 51 is positioned with respect to the outer yoke 4.
  • the number of the magnetic poles 44 is five, and each magnetic pole 44 is arranged at an equal distance from the rotation center (axis 60) of the rotor 6, that is, at equal angular intervals on a concentric circle. ing. Also, the width of each magnetic pole 44 gradually decreases in a direction away from the bottom 41.
  • the inner yoke 3 is a member made of a soft magnetic material, and has a disk-shaped (annular plate-shaped) base 31 and a base 31. And a plurality of magnetic poles 34 erected from the edge of the opening 33 formed at the center of the slab.
  • the outer diameter of the base portion 31 is substantially the same as the outer diameter of the outer yoke 4 (more specifically, the outer diameter near the end 4 21 of the outer peripheral portion 42).
  • Notches 35 and 36 are formed on the outer periphery of the base 31 at positions facing each other via the opening 33.
  • the notch 35 has a terminal portion 53 formed on the bobbin 51 passed therethrough and protrudes outward, and the notch 36 has a positioning projection 54 formed on the bobbin 51 fitted therein. These positions the bobbin 51 with respect to the inner yoke 3.
  • the base 31 has protrusions 37 and 37 at positions facing each other through the opening 33. Holes 38 are formed. The projection 37 and the hole 38 are fitted with the hole 38 and the projection 37 of the other inner yoke 3, indicated by the dotted line in FIG. Positioning, that is, positioning of the unit bodies is performed.
  • the number of the magnetic poles 34 is equal to the number of the magnetic poles 44, and each magnetic pole 34 is equidistant from the axis 60, that is, on the concentric circle, similarly to the magnetic pole 44. Are arranged at equal angular intervals.
  • the width of each magnetic pole 34 gradually decreases from the base 31 downward in FIG.
  • Such an inner yoke 3 and an outer yoke 4 are different from the inner yoke 130 and the outer yoke 140 in the conventional stepping motor 100, respectively. 1 4 5) is not provided. Therefore, when assembling the stator 2, the inner yoke 3 and the outer yoke 4 are aligned using, for example, a jig 20 or 22 described later, and these are combined.
  • the outer peripheral edge 32 of the base 31 does not abut on the outer peripheral portion 42, the outer diameter of the base 31 and the vicinity of the end 4 21 of the outer peripheral portion 42 are temporarily assumed. Even if there is a dimensional error with the outer diameter of the outer diameter, the dimensional error is only absorbed as a deviation between the outer peripheral edge 3 2 and the outer peripheral surface near the end 4 21 of the outer peripheral portion 42, It does not affect the positional relationship between the magnetic poles 34 and 44 inside the stator 2. Therefore, the dimensional accuracy of the gap 15 is extremely high.
  • the coil 5 is inserted into an annular space formed between the outer peripheral portion 42 and the magnetic poles 34, 44.
  • the coil 5 is formed by applying a winding 52 to a bobbin 51 made of an insulating material such as a synthetic resin.
  • the terminal portion 53 formed on the bobbin 51 is formed by burying a pair of terminals 531 and 532 in the constituent material (synthetic resin) of the bobbin 51 in a non-contact manner. Then, both ends of the winding 52 are connected to the terminals 5 3 1 and 5 3 2 of the terminal 5 3. Are electrically connected to each other.
  • a pulse signal is supplied to the winding 52 through the terminals 531, 5332 by a drive circuit (not shown) of the stepping motor 1, the coil 5 is excited and the torque for driving the rotor 6 to rotate. Occurs.
  • the rotator 6 rotates a predetermined number of steps, that is, a predetermined angle, according to the number of pulses of the input pulse signal.
  • the unit as described above is fixed by, for example, welding so that the bases 31 and 31 'of the inner yokes 3 and 3 are joined to each other. It is preferable that the abutting surfaces 39 of the bases 31 and 31 'are joined as closely as possible, that is, in close contact.
  • the two unit bodies are fixed in a positional relationship such that the magnetic poles 34, 44 in one unit body and the magnetic poles in the other unit body are shifted by a half pole in the circumferential direction. Therefore, the protrusion 37 and the hole 38 and the hole 38 and the protrusion 37 'are formed at positions where both units have such a positional relationship. With such a configuration, the number of steps of the stepping motor 1 is 20 steps in total.
  • micro-step driving may be further performed by the driving circuit of the stepping mode.
  • the rotor 6 includes a rotating shaft 61 and a cylindrical permanent magnet 62 installed on the outer periphery of the rotating shaft 61.
  • the rotating shaft 61 and the permanent magnet 62 are formed by pressing the rotating shaft 61 into the bore (shaft hole) of the permanent magnet 62, or by inserting the rotating shaft 61 into the bore of the permanent magnet 62. They are fixed by inserting (fitting) and bonding them with an adhesive.
  • the permanent magnet 62 is multipolarly magnetized (10 poles) in the radial direction.
  • a groove 63 is formed along the outer periphery of the permanent magnet 62 at a substantially central portion in the longitudinal direction, that is, near the base 31 of the inner yoke 3, so that the outer diameter of the permanent magnet 62 is larger than that of other places. is decreasing. With such a configuration, the self-starting current can be improved, and the effect of improving various characteristics of the stepping motor described later becomes more remarkable.
  • the permanent magnet 62 a magnet having excellent magnetic properties is used.
  • a rare earth magnet containing a rare earth element and a transition metal as a basic component, or a rare earth element and a transition metal are used.
  • Rare earth magnets containing metal and polon as basic components are preferably used.
  • the form (kind) of the permanent magnet 62 may be any of, for example, a bonded magnet, a sintered magnet, etc.
  • the magnetic poles 3 4 and 4 4 face each other on the outer peripheral surface of the permanent magnet 6 2 except for the groove 63. I do.
  • the distance between the outer peripheral surface of the permanent magnet 62 and each of the magnetic poles 34 and 44 is preferably about 0.05 to 0.25, more preferably 0.10 to 0.20 mm.
  • a small gap (gear) 15 is formed.
  • a bottom plate 7 is fixed to the base end of the stator 2 via a lead thrust spring 71 so as to shield the inner cavity of the stator 2.
  • the lead thrust spring 71 has a plate panel 72 in the center of a thin plate-shaped member, and the rotating shaft 61 is urged (pre-pressed) by the plate panel 72 in the distal direction.
  • a mounting plate 8 is fixed to the tip of the stator 2, and a holder 10 is fixed to the tip of the mounting plate 8 at the support portion 11.
  • the fixing between the stator 2 and the mounting plate 8 is preferably performed by welding such as plasma welding.
  • the fixing between the holder supporting portion 11 and the mounting plate 8 is performed by welding such as plasma welding or by screwing.
  • the holder 110 is a plate-shaped member, and has support portions 11 and 12 formed on the base end side and the front end side thereof, respectively, which are formed by being bent at right angles.
  • a circular opening 91 is formed in the support portion 11 and the mounting plate 8, and a bearing 9a is press-fitted in the circular opening 91.
  • a circular opening 92 is formed in the support portion 12, and a bearing 9 b is press-fitted in the circular opening 92.
  • the holder 10 has a mounting hole 13 for mounting the holder 10 at a predetermined position.
  • the rotating shaft 61 is extended to the vicinity of the support portion 12 in the distal direction, and is rotatably supported by the bearings 9a and 9b.
  • the bearings 9a and 9b use sliding bearings made of a sintered body, but may be sliding bearings or rolling bearings (bearings) made of resin.
  • a lead screw 14 is installed between the bearings 9a and 9b of the rotating shaft 61. Have been.
  • a moving body (not shown) having an engagement portion that engages with the screw of the lead screw 14 is moved in the longitudinal direction of the rotating shaft 61. It moves a distance according to the rotation amount of 14.
  • This movement of the moving body can be used for lens driving for focusing and zooming of an optical system in various optical devices such as a camera, a video camera, and a copy machine.o
  • the inner yoke 3 and the outer yoke 4 may be made of a soft magnetic material such as pure iron, or a metal material such as a zinc plated steel plate or a Fe—Cr alloy.
  • FIG. 8 is a partial sectional side view showing a first assembling method of the stepping motor of the present invention.
  • the first assembling method is a method characterized in that the alignment between the inner yoke 3 and the outer yoke 4 is performed based on the inner diameter of the stator 2 (the inner diameter of the bore of the stator 2).
  • the coil 5 is assembled by winding the bobbin 5 1 to the coil 5, and the coil 5 is placed between the inner yoke 3 and the outer yoke 4, that is, the outer peripheral portion 4 2 and the magnetic poles 3 4, 4. 4 and inserted into the annular space formed. At this time, the terminal 53 and the positioning projection 54 of the bobbin 51 are inserted into the corresponding notches 35, 36, 45, and 46, respectively. This work is performed on two sets of unit bodies composed of one set of inner yoke 3, outer yoke 4, and coil 5.
  • the bases 31 and 31 'of the inner yokes 3 and 3' of both units are fitted to each other, and the protrusion 37 and the hole 38 'and the hole 38 and the protrusion 37' are fitted respectively.
  • the positioning cylinder 21 of the jig 20 is inserted into the inner cavity of the stator 2.
  • the outer peripheral portion 32 of the bases 31, 31 of the inner yokes 3, 3 ' is exposed near the outer peripheral surface of the outer yoke 4, the outer yokes 4 of the inner yokes 3, 3' are exposed.
  • the inner yoke 3 and the outer yoke 4 of both units are aligned so that the magnetic poles 34, 44 are arranged equidistant from the axis 60, that is, concentrically.
  • the mounting plate 8 is previously inserted into the positioning column 21 of the jig 20, and the positioning of the stator 2 and the mounting plate 8 is performed at the same time.
  • a pressing force in the direction of the axis 60 is applied to the stator 2 so as to make the gap between the contact surfaces 39 as small as possible.
  • the boundary between 2 (the outer boundary) and the boundary between the outer yoke 4 and the mounting plate 8 (the outer boundary) are welded by plasma welding, for example, and these are fixed (bonded). I do.
  • a bottom plate 7 is placed on the side of the stator 2 opposite to the mounting plate 8, and the stator 2 and the bottom plate 7 are similarly fixed. As described above, the first step of assembling the stator 2 is completed.
  • stator 2 is removed from the jig 20 and the rotor 6 assembled in advance is inserted into the inner cavity of the stator 2 (second step).
  • the bearings 9a and 9b are fixed to the support portions 11 and 12 of the holder 110.
  • the mounting plate 8 and the support portion 11 of the holder 10 are fixed to each other by a method such as welding or screwing. Thereby, the steering motor 1 of the present invention is completed.
  • FIG. 9 is a partial cross-sectional side view showing a second assembling method of the steering motor of the present invention.
  • the second assembling method will be described, but the description of the same items as in the first assembling method will be omitted.
  • the second assembling method is characterized in that the alignment between the inner yoke 3 and the outer yoke 4 is performed based on the outer diameter of the stator 2.
  • the bases 31 and 31 'of the inner yokes 3 and 3' of both units are fitted to each other, and the protrusion 37 and the hole 38 'and the hole 38 and the protrusion 37' are fitted respectively.
  • the stator 2 is inserted into the inner cavity of the positioning cylindrical portion 23 of the jig 22.
  • the inner yoke 3 and the outer yoke 4 of both units are aligned so that the magnetic poles 34, 44 are arranged equidistant from the axis 60, that is, concentrically.
  • the mounting plate 8 is previously inserted into the positioning cylindrical portion 23 of the jig 20, and the positioning between the stator 2 and the mounting plate 8 is performed simultaneously.
  • stator 2 is removed from the jig 22 and the rotor 6 is inserted into the lumen of the stator 2 in the same manner as described above (second step), and the mounting plate 8 and the holder 10 are supported.
  • the part 11 is fixed by, for example, welding or screwing. Thereby, the stepping motor 1 of the present invention is completed.
  • the insertion of the rotor 6 into the inner cavity of the stator 2 can be performed through the bottom opening 26 of the jig 22 while the stator 2 is mounted on the jig 22.
  • the various conditions and measurement conditions for each of the stepping motors 1 and 100 are as follows.
  • Stator inner diameter (comparative example): 5.3 mm (design value)
  • Gap spacing 0.15 mm (design value)
  • Gap spacing error (in the present invention): within ⁇ 0.05 mm
  • Gap spacing error (comparative example): within ⁇ 0.1 l min
  • Bond magnet made of Sm-Co magnetic powder
  • the stepping motor according to the present invention has a smaller gap error and a higher dimensional accuracy than the comparative example.
  • the stepping motor according to the present invention has higher bull-in torque and bull-out torque in the high-speed range than the comparative example.
  • the maximum self-starting frequency of the stepping motor of the comparative example is about 610 Hz at the CK input
  • the maximum self-starting frequency of the stepping motor according to the present invention is about 680 at the CK input. Hz, and the maximum self-starting frequency has improved.
  • the maximum continuous response frequency of the stepping motor of the comparative example is about 1630 Hz at the CK input
  • the maximum continuous response frequency of the stepping motor of the present invention is 17 2 at the CK input. 80 Hz or higher has been achieved, and the maximum continuous response frequency has been improved.
  • the stepping motor of the present invention has a lower self-starting current (voltage) in a high-speed region than the comparative example.
  • the self-starting current of the stepping motor of the present invention at 400 Hz with the CK input is about 21 mA
  • the self-starting current of the stepping motor of the comparative example at the same frequency is 28 mA or more, and in the present invention, the self-starting current is reduced by 25% or more.
  • the stepping motor and the method of assembling the stepping motor according to the present invention have been described based on the illustrated embodiment.
  • the present invention is not limited to this.
  • the constituent elements can be appropriately replaced with arbitrary ones capable of producing a similar function.
  • two units are used as the stator 2 in order to improve the stability (balance) in the structure and the magnetic circuit.
  • one unit or three or more units are used. It may be used.
  • the application of the stepping mode is not limited to the above-described lens driving for focusing and zooming of the optical system in various optical devices, and may be any application.
  • a PM type stepping motor has been described.
  • the present invention is not limited to this, and may be applied to a VR type or hybrid type stepping motor. There may be.
  • the alignment between the inner yoke and the outer yoke can be adjusted. For example, it can be performed on the basis of internal suspicion. As a result, the dimensional accuracy of the gap between each magnetic pole of the stator and the rotor is improved, and magnetic leakage is also prevented, thereby improving various characteristics of the stepping motor.
  • a predetermined torque can be obtained with a lower input value (current), which saves power consumption, prolongs the life of the battery, and enables rotation to a higher frequency range, thus increasing the speed of driving. Is possible, and the angle accuracy is improved.
  • the stepping motor of the present invention it is not necessary to provide a means for performing alignment by itself, such as the step portion, in the inner yoke and the outer yoke. Since a special processing step is not required, the production (processing) of these parts becomes easy and the parts can be produced at low cost.
  • a stepping motor having the above-described excellent characteristics can be easily and reliably manufactured without complicating the manufacturing process, and is applicable to mass production. can do.
  • the stepping motor of the present invention can be used for lens driving such as focusing or zooming, it is suitable for being mounted on an optical device such as a camera or a video camera.

Abstract

Cette invention concerne un moteur pas-à-pas dont les caractéristiques ont été améliorées en évitant toute déviation de la position des culasses internes et externes du moteur à l'aide d'une structure simple. Ce moteur pas-à-pas (1) comprend les éléments suivants: un stator (2); un rotor (6) qui est inséré en rotation dans le stator (2); une plaque de fond (7) et une plaque de montage (8) qui sont fixées respectivement aux deux extrémités du stator (2); des paliers (9a, 9b); un support (10) fixé sur la plaque de montage (8); et enfin, une vis de commande (14) fixée à l'arbre rotatif (61) du rotor (6). Le stator (2) comporte deux ensembles de culasses internes et externes (3, 4) entre lesquelles sont disposées deux bobines (5). Les culasses et les bobines sont fixées de manière à ce que les sections de base (31) des culasses (3) soient reliées entre elles. Les culasses (3 et, 4) sont reliées entre elles de manière à ce que les sections de base (31) des culasses (3) entrent en contact avec les sections d'extrémité (421) des sections périphériques externes (42) des culasses (4), et de manière à ce que les sections (32) des bords périphériques externes des sections de base (31) soient exposées à proximité des surfaces périphériques externes des culasses (4).
PCT/JP1997/002063 1996-06-14 1997-06-13 Moteur pas-a-pas et procede d'assemblage WO1997048173A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/154676 1996-06-14
JP15467696 1996-06-14

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WO1997048173A1 true WO1997048173A1 (fr) 1997-12-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056689A1 (fr) * 2001-12-24 2003-07-10 Lg Innotek Co., Ltd Moteur pas-a-pas et son procede de fabrication
EP1359656A1 (fr) * 2002-04-30 2003-11-05 Saia-Burgess Murten AG Moteur électrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100555819C (zh) * 2004-11-08 2009-10-28 亚洲光学股份有限公司 定子分体式步进马达

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WO2003056689A1 (fr) * 2001-12-24 2003-07-10 Lg Innotek Co., Ltd Moteur pas-a-pas et son procede de fabrication
EP1359656A1 (fr) * 2002-04-30 2003-11-05 Saia-Burgess Murten AG Moteur électrique
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