CN1198853A - Stepping motor and method for assembling the same - Google Patents
Stepping motor and method for assembling the same Download PDFInfo
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- CN1198853A CN1198853A CN97191082A CN97191082A CN1198853A CN 1198853 A CN1198853 A CN 1198853A CN 97191082 A CN97191082 A CN 97191082A CN 97191082 A CN97191082 A CN 97191082A CN 1198853 A CN1198853 A CN 1198853A
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- 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
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- 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
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- 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
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Abstract
The characteristics of a stepping motor are improved by preventing the positional deviation between the internal and external yokes of the motor with a simple structure. The stepping motor (1) is constituted of a stator (2), a rotor (6) which is rotatably inserted into the stator (2), a bottom plate (7) and a mounting plate (8) which are respectively fixed to both ends of the stator (2), bearings (9a and 9b), a holder (10) fixed to the mounting plate (8), and a lead screw (14) attached to the rotating shaft (61) of the rotor (6). The stator (2) is provided with two sets of internal and external yokes (3 and 4) and tow coils (5) arranged between the yokes (3 and 4). The yokes and coils are fixed so that the base section (31) of the yokes (3) are joined to each other. The yokes (3 and 4) are joined to each other so that the base sections (31) of the yokes (3) are in contact with the end sections (421) of the outer peripheral sections (42) of the yokes (4) and the outer peripheral edge sections (32) of the base sections (31) are exposed near the outer peripheral surfaces of the yokes (4).
Description
Technical field
The present invention relates to stepping motor, particularly relate to the stepping motor that is used in the optical devices such as video camera and television camera focusing and draws the lens driving of varifocal to use.
Technical background
In video camera and television camera, be used for focusing and draw the lens driving of varifocal, use the small type stepping motor that on its rotating shaft, is provided with leading screw.In this stepping motor, for the reason relevant, require low power consumption, can obtain lens with alap input value (electric current) and drive required regulation torque, serve as to realize that high speed that lens drive can rotate and characteristic such as angle precision is good up to high frequency region with its purposes.
Figure 12 and Figure 13 show the structure of existing stepping motor.Existing stepping motor 100 shown in these figure comprises stator 120 and rotatably is inserted into the rotor 160 of the inboard of this stator 120.Yoke 130, outer yoke 140 reached the winding 150 that is provided with betwixt in stator 120 had been prepared 2 groups, and it is fastening, were that the base portion 131 that makes yoke 130 in each engages.
Form a plurality of magnetic poles 134,144 respectively on interior yoke 130 and outer yoke 140, the magnetic pole 134,144 of each yoke 130,140 alternatively and mutually disposes non-contiguously along the peripheral part of the cylindric permanent magnet 162 on the rotating shaft 161 that is fastened on rotor 160.Also have, it is opposed that the outer peripheral face of each magnetic pole of interior yoke 130 and outer yoke 140 and the permanent magnet 162 of rotor 160 separates specified gap.
In the stator 120 of so existing stepping motor 100, interior yoke 130 and outer yoke 140 can utilize himself shape to carry out the cooperation of position.
Promptly, as shown in figure 13, the inboard of the end of yoke 140 (joint (the つ I closes わ せ) face 139 sides of yoke 130 in each) forms step variant part 145 outside, the outer peripheral portion 132 of the base portion 131 of interior yoke 130 is linked this step variant part 145, interior yoke 130 is coupled in the outer yoke 140, and the position of two yokes 130,140 is cooperated.Therefore, as shown in figure 12, near the composition surface 139 of the outer peripheral face of stepping motor 100, the outer peripheral portion 131 of interior yoke 130 is not exposed.Yet, in such structure, the outer peripheral portion 132 of interior yoke 130 links to each other with the step variant part 145 of outer yoke 140, so, if there are scale error (internal diameter of coupling part, the scale error of external diameter etc.) in interior yoke 130 and outer yoke 140, then this error shows as in the inner chamber of all stators 120, and the position of interior yoke 130 and outer yoke 140 is offset.That is, the size (gap length) in the gap 170 between the outer peripheral face of each magnetic pole 134,144 of interior yoke 130 and outer yoke 140 and permanent magnet 162 is inhomogeneous.
Also have, surpass under the situation of design load at the external diameter of the substrate 131 of interior yoke 130 internal diameter less than design load or step variant part 145, between the inner peripheral surface of outer peripheral portion 132 and step variant part 145, produce the gap, the cooperation of yoke 130 and outer yoke 140 in can not correctly carrying out.Fixing, also have, owing to this gap produces leakage field, magnetic property is brought adverse effect.
Therefore, in existing stepping motor 100, owing to the scale error of interior yoke 130 and outer yoke 140 reaches the actuating speed-torque characteristics deterioration that makes stepping motor based on the offset of scale error, perhaps the self-starting electric current increases in high velocity, perhaps angle precision also reduces, so, exist the problem that can not fully satisfy above-mentioned requirements.
Also have, if outside dimension, the internal diameter size of step variant part 145 and the positional precision of each magnetic pole 134,144 of base portion 131 all meet design load, then do not produce the problems referred to above, but they critically are processed into suitable dimensions is difficult, also have, carry out the rising significantly that such Precision Machining will cause the complicated and production cost of manufacturing process, realization property is relatively poor.
The object of the present invention is to provide simple in structure, in the time of can preventing to install in the offset of yoke and outer yoke, whereby, can improve the stepping motor of all characteristics of stepping motor, and the installation method of the stepping motor of such stepping motor can easily be installed.
Disclosure of an invention
(1) stepping motor of the present invention has the stator of the winding that comprises at least one group of interior yoke, outer yoke and be provided with betwixt and rotatably inserts the rotor of this stator inboard, the a plurality of magnetic poles that form on a plurality of magnetic poles that form on the yoke in above-mentioned and the above-mentioned outer yoke alternatively dispose along the outer peripheral face of above-mentioned rotor, yoke has its external diameter and the discoid base portion that the external diameter of above-mentioned outer yoke equates substantially in above-mentioned, exposes near the outer peripheral face of the outer peripheral portion of this base portion yoke outside above-mentioned.
(2) said stator preferably yoke, outer yoke in two groups and the winding that is provided with betwixt are fixed as make above-mentioned in each above-mentioned each base portion of yoke engage.
(3) each magnetic pole of yoke and outer yoke does not preferably contact with the outer peripheral face of above-mentioned rotor in above-mentioned, and with above-mentioned rotor pivot be the setting of equidistant position.
(4) above-mentioned rotor preferably has permanent magnet, and near the external diameter of above-mentioned permanent magnet above-mentioned base portion reduces.
(5) be preferably on the rotating shaft of above-mentioned rotor leading screw is set.
(6) also have, the stepping motor installation method of the stepping motor that a kind of installation is as above put down in writing,
Included insert winding between yoke and outer yoke, make above-mentioned in the position of yoke and above-mentioned outer yoke cooperate and in conjunction with first operation of stator being installed and in second operation of the inboard of said stator insertion rotor in the back; The position of yoke and above-mentioned outer yoke cooperation in above-mentioned in above-mentioned first operation is that benchmark carries out with the internal diameter of said stator.
(7) above-mentioned position cooperation is preferably undertaken by insert anchor clamps in the inner chamber of said stator.
(8) the stepping motor installation method of the stepping motor as above put down in writing of a kind of installation,
Included insert winding between yoke and outer yoke, make above-mentioned in the position of yoke and above-mentioned outer yoke cooperate and in conjunction with first operation of stator being installed and in first operation of the inboard of said stator insertion rotor in the back; The position of yoke and above-mentioned outer yoke cooperation in above-mentioned in above-mentioned first operation is that benchmark carries out with the external diameter of said stator.
(9) above-mentioned position cooperation is preferably undertaken by insert said stator in the inner chamber of anchor clamps.
(10) combination of above-mentioned interior yoke and above-mentioned outer yoke is preferably undertaken by the hole portion that forms on above-mentioned anchor clamps.
(11) a kind of stepping motor installation method that stepping motor is installed, wherein stepping motor has the stator and the rotor of the winding that comprises interior yoke, outer yoke and be provided with betwixt, yoke and outer yoke can not carry out the position cooperation by himself shape in above-mentioned, it is included in inserts above-mentioned winding between yoke and above-mentioned outer yoke in above-mentioned, use anchor clamps make above-mentioned in the position of yoke and above-mentioned outer yoke cooperate and in conjunction with after the installation stator first operation and insert second operation of above-mentioned rotor in the inboard of said stator; The position of yoke and above-mentioned outer yoke cooperation in above-mentioned in above-mentioned first operation is that benchmark carries out with the internal diameter or the external diameter of stator.
The simple declaration of accompanying drawing
Fig. 1 is the plane graph of the embodiment of expression stepping motor of the present invention;
Fig. 2 is the II-II line profile among Fig. 1;
Fig. 3 is the exploded perspective view of the formation of interior yoke of expression and outer yoke;
Fig. 4 is the plane graph of the formation of the outer yoke of expression;
Fig. 5 is the V-V line profile (end view drawing) among Fig. 4;
Fig. 6 is the plane graph of the formation of yoke in the expression;
Fig. 7 is the VII-VII line profile (end view drawing) among Fig. 6;
Fig. 8 represents the cut-away section end view of stepping motor installation method of the present invention;
Fig. 9 is the cut-away section end view of expression stepping motor installation method of the present invention;
Figure 10 is the figure of the relation of expression actuating speed of stepping motor and torque; Figure 11 is the figure of the relation of expression actuating speed of stepping motor and self-starting electric current; Figure 12 is the plane graph of the structure of the existing stepping motor of expression; Figure 13 is the XIII-XIII line profile among Figure 12.Explanation 1 stepping motor 2 stators 3 of symbol, 3 ' interior yoke 31,31 ' base portion, 32 outer peripheral portion, 33 openings, 34 magnetic poles 35,36 breach 37,37 ' jut 38,42 peripheral parts, 421 ends, 4 outer yoke 41 bottoms, 39 composition surfaces, 38 ' hole, 43 openings, 44 magnetic poles 45,46 breach, 5 windings, 51 bobbins, 52 coilings, 53 portion of terminal 531,532 terminals, 54 location jut 6 rotors 60 axis 61 rotating shafts 62 permanent magnets 63 ditches 7 base plates 71 guiding thrust springs 72 leaf springs 8 mounting panel 9a, 9b bearing 91,10 11 of 92 circular opens, locate with cylindrical portion 24 with columnar portion 22 anchor clamps 23 20 anchor clamps, 21 location, 12 support sectors, 13 installing hole 14 leading screws, 15 gaps, yoke 131 base portions 132 outer peripheral portion 134 magnetic poles 139 composition surfaces 140 outer yoke 144 magnetic poles 145 step variant parts 150 windings 160 rotors 161 rotating shafts 162 permanent magnets in 25 side openings, 26 bottom openings, 100 stepping motors, 120 stators 130
170 gaps
The best mode that is used to carry out an invention
Below, with reference to the accompanying drawings shown in preferred embodiment describe the installation method of stepping electrode of the present invention and stepping motor in detail.
Fig. 1 is the plane graph of the embodiment of expression stepping motor of the present invention, Fig. 2 is the II-II line profile among Fig. 1, Fig. 3 is the exploded perspective view of the formation of interior yoke of expression and outer yoke, Fig. 4 is the plane graph of the formation of the outer yoke of expression, Fig. 5 is the V-V line profile (end view drawing) among Fig. 4, Fig. 6 is the plane graph of the formation of yoke in the expression, and Fig. 7 is the VII-VII line profile (end view drawing) among Fig. 6.Also have, in the following description, the right side among Fig. 1 and Fig. 2 is called cardinal extremity, the left side is called the tip.
As shown in Figures 1 and 2, the stepping motor 1 of present embodiment is a PM type stepping motor, mainly comprises: stator 2; Row inserts the rotor 6 of the inboard of this stator 2 rotatably; Be fixed in the base plate (lid) 7 of the cardinal extremity of stator 2; Be fixed in the mounting panel 8 at the tip of stator 2; Bearing 9a, 9b; Be fixed in the frame 10 on the mounting panel 8; With the leading screw 14 on the rotating shaft 61 that is arranged on rotor 6.
As Fig. 2～shown in Figure 5, outer yoke 4 is by what soft magnetic material constituted the bottom tube-like parts to be arranged, and comprises bottom 41, the limit portion of the 41 upright cylindric peripheral parts 42 that are provided with, the opening 43 that forms from 41 the central part in the bottom is towards the direction upright a plurality of magnetic poles 44 that are provided with identical with peripheral part 42 from the bottom.
In addition, on peripheral part 42, passing through to form breach 45 and 46 on the opening 43 mutual opposed positions.On breach 45, to insert and to lead to the portion of terminal 53 that on aftermentioned bobbin 51, forms and outstanding to the outside, the location usefulness jut 54 that will form on bobbin 51 cooperates with breach 46, carries out the location to the outer yoke 4 of bobbin 51 like this.
In the present embodiment, the number of magnetic pole 44 is 5, and each magnetic pole 44 is that the pivot (axis 60) with rotor 6 for equidistantly, promptly is configured with equal angles on concentric circles at interval.Also have, the width of each magnetic pole 44 is along with reducing gradually away from the direction of bottom 41.
44 of adjacent each magnetic poles insert non-contiguously mutually described later in the magnetic pole 34 of yoke 3.At this moment, magnetic pole 34 and magnetic pole 44 are mutually oppositely.
As Fig. 2, Fig. 3, Fig. 6 and shown in Figure 9, interior yoke 3 is the parts that are made of soft magnetic material, comprises the base portion 31 of discoid (annulus is tabular) and from the upright a plurality of magnetic poles 34 that are provided with of limit portion of the opening 33 that forms at the central part of base portion 31.
The external diameter of the external diameter of base portion 31 and outer yoke 4 (in more detail, being near the external diameter in end 421 of peripheral part 42) is basic identical.
Also have,, passing through to form breach 35 and 36 on the opening 33 mutual opposed positions at the peripheral part of base portion 31.On breach 35, to insert and to lead to the portion of terminal 53 that on bobbin 51, forms and outstanding to the outside, the location usefulness jut 54 that will form on bobbin 51 cooperates with breach 36, carries out the location to the interior yoke 3 of bobbin 51 like this.
Also have,, passing through to form projection 37 and hole 38 on the opening 33 mutual opposed positions at base portion 31.This jut 37 and hole 38 respectively with Fig. 7 in the opposing party shown in the superimposing thread interior yoke 3 ' hole 38 ' and jut 37 ' cooperates, carry out each interior yoke 3,3 ' the location, i.e. the location of constituent parts body.
In the present embodiment, the number of magnetic pole 34 is identical with above-mentioned magnetic pole 44, all is 5, and each magnetic pole 34 is identical with above-mentioned magnetic pole 44, for axis 60 for equidistantly, promptly on concentric circles, be configured at interval with equal angles.Also have, the width of each magnetic pole 34 reduces gradually from the direction of the below of base portion 31 to Fig. 7.
Interior yoke 130 in interior yoke 3 like this and outer yoke 4 and the above-mentioned existing stepping motor 100 is different with outer yoke 140, does not have to be provided with in himself to carry out the parts (step variant part 145) that the position cooperates.Therefore, when stator was installed, the position of for example using anchor clamps 20 described later or 22 to carry out interior yoke 3 and outer yoke 4 cooperated, and they are combined.
Under the state that outer yoke 4 and interior yoke 3 have been made up, with five magnetic poles 44 and five magnetic poles 34 on concentric circles alternatively and configuration non-contiguously mutually, form the magnetic pole of 10 utmost points altogether.Also have, under this state, the base portion 31 of interior yoke 3 contacts with the end 421 of peripheral part 42, and the outer peripheral portion 32 of base portion 31 is exposed near the outer peripheral face of yoke 4 outside.
Like this, in the present invention, the outer peripheral portion 32 of base portion 31 does not contact with peripheral part 42, therefore, even exist scale error near the external diameter of the supposition end 421 of the external diameter of base portion 31 and peripheral part 42, this scale error also is to be absorbed as near the skew of the outer peripheral face the end 421 of outer peripheral portion 32 and peripheral part 42, and the magnetic pole 34 of stator 2 inboards and the position relation of magnetic pole 44 are provided with influence.Therefore, the dimensional accuracy in gap 15 is high.
Also have, under the state that outer yoke 4 and interior yoke 3 made up, winding 5 is inserted into annulus in peripheral part 42 and 34,44 formation of each magnetic pole.Winding 5 is that coiling coiling 52 forms on the bobbin 51 that the insulating material such by synthetic resin constitutes.In the portion of terminal 53 that forms on the bobbin 51 is to bury pair of terminal 531,532 non-contiguously underground mutually in by the constituent material (synthetic resin) at bobbin 51 to form.And the two ends of coiling 52 link to each other with terminal 531,532 electricity of portion of terminal 53 respectively.
If utilize the drive circuit (not shown) of stepping motor 1, by 531,532 pairs of terminals coiling, 52 electrical pulse signals, winding S rotates the torque that drives rotor 6 with regard to excitation.And rotor 6 is according to the step number of the umber of pulse rotation regulation of the pulse signal of input, i.e. Gui Ding angle.
More than such unit bodies for example fix by welding so that each in yoke 3,3 ' base portion 31,31 ' joint.Each base portion 31,31 ' the composition surface preferably very close to each other as far as possible, i.e. fluid-tight engagement.
In this case, each magnetic pole of each magnetic pole 34,44 of a unit bodies and another unit bodies fixes to depart from the such position relation of half-shadow size at circumferencial direction in two unit bodies.Thereby, constitute the position of such position relation in two unit bodies, form above-mentioned jut 37 and hole 38, hole 38 ' and jut 37 '.According to such formation, the step number of stepping motor 1 amounted to for 20 steps.Also have, also can utilize the above-mentioned drive circuit of stepping motor 1 further to carry out more small step driving.
Also have, in the present invention, number of magnetic poles and number of steps are not limited to the number that present embodiment is lifted, and this is self-evident.
Permanent magnet 62 is radially carrying out multipole magnetize (10 utmost point).Also have, near the base portion 31 of yoke 3, along its peripheral shape grooving 63, the external diameter of permanent magnet 62 reduces than other places in the portion of substantial middle longitudinally of permanent magnet 62 is.By such formation, can improve the self-starting electric current, the raising effect of each characteristic of stepping motor described later will be more obvious.
Also have,, use the good magnet of magnetic characteristic as permanent magnet 62, for example, with rare earth element and transition metal rare earth element magnet, perhaps with rare earth element, transition metal and boron rare earth element magnet as basis as basis.Also have, the form of permanent magnet 62 (kind) for example can be binding magnet and sintered magnet etc. any.
Under the state in the inner chamber that rotor 6 is inserted into stator 2 (inboard hole), the noncontact on the outer peripheral face of the part except the ditch 63 of permanent magnet 62 of above-mentioned each magnetic pole 34,44 is opposed.In this case, between the outer peripheral face and each magnetic pole 34,44 of permanent magnet 62, be preferably formed as about 0.05～0.25mm, the gap about 0.10～0.20mm 15 particularly.
By guiding thrust spring 71, base plate 7 is fixed on the cardinal extremity of stator 2, so that cover the inner chamber of stator 2.Guiding thrust spring 71 central portions at the thin plate endless member have leaf spring 72, utilize 72 pairs of rotating shafts 61 of this leaf spring to add elastic force (precompressed) on tip direction.
Also have, mounting panel 8 is fixed on the tip of stator 2, and in its support sector 11, frame 10 is fixed on its tip.The fixing of stator 2 and mounting panel 8 for example preferably utilizes the such welding of plasma welding to carry out.
Also have the support sector 11 of frame and mounting panel 8 fixing for example preferably by the such welding of plasma welding or utilize spring to be connected and carry out.
Also have, on frame 10, be formed for installing hole 13 at regulation position installing rack 10.
Rotating shaft 61 extends to along tip direction near the support sector 12, is rotatably being supported by bearing 9a and 9b.In the present embodiment, the sliding bearing that bearing 9a, 9b use sintered body to constitute, but also can utilize sliding bearing or the rolling bearing that forms by ester moulding.
On the position between bearing 9a, the 9b of rotating shaft 61, leading screw 14 is set.If the rotation of rotor 6 causes leading screw 14 rotation, have with the moving body (not shown) of the engaging piece of the screw-threaded engagement of leading screw 14 just rotating shaft 61 vertically on the distance of mobile rotation amount corresponding to leading screw 14.Moving of this moving body for example can be used for the focusing of optical system and draw the lens driving of varifocal to use in various optical devices such as video camera, television camera, photocopier.
Also have, interior yoke 3 and outer yoke 4 also can be made of metal materials such as the galvanized steel plain sheet outside the such soft magnetic material of pure iron, Fe-Cr alloys.
One example of the installation method of stepping motor 1 then, is described.
Fig. 8 is the cut-away section end view of the 1st installation method of expression stepping motor of the present invention.
The 1st installation method is characterised in that, is the position cooperation of yoke 3 and outer yoke 4 in benchmark carries out with the internal diameter (internal diameter of the inner chamber of stator 2) of stator 2.
Be described in detail below.At first, windings 5 are installed in coiling coiling 52 on bobbin 51, are insertion winding 5 in the annulus that forms between peripheral part 42 and each magnetic pole 34,44 between interior yoke 3 and outer yoke 4.At this moment, in the breach 35,36,45,46 of correspondence, insert the portion of terminal 53 and the location jut 54 of bobbin 51 respectively.Also have, this operation is carried out two groups of unit bodies (being made of yoke 3, outer yoke 4 and winding 5 in 1 group).
Then, to yoke 3,3 in each of two unit bodies ' base portion 31,31 ' position and engage, make jut 37 and hole 38 ' and hole 38 and jut 37 ' cooperate respectively, the location of inserting anchor clamps 20 at the inner chamber of this stator 2 is with columnar portion 21.At this moment, interior yoke 3,3 ' base portion 31,31 ' outer peripheral portion 32 expose near the outer peripheral face of yoke 4 outside, so, interior yoke 3,3 ' can move with respect to outer yoke 4.Therefore, the interior yoke 3 and the outer yoke 4 of two unit bodies carried out the position cooperation so that each magnetic pole 34,44 be with axis 60 for equidistantly, promptly on concentric circles, be configured.
Also have, in advance mounting panel 8 is inserted on the location usefulness columnar portion 21 of anchor clamps 20, the position of stator 2 and mounting panel 8 cooperates also carries out simultaneously.
Then, applying pressing force on axis 60 directions on the stator 2 to reduce the gap on composition surface 39 as far as possible, under this state, for example utilize near plasma welding the periphery with composition surface 39, base portion 31 welds respectively with the boundary portion (boundary portion of periphery) of peripheral part 42 and the boundary portion (outer perimeter portion) of outer yoke 4 and mounting panel 8, their fastening (joints) are got up.Also have, base plate 7 is arranged on the opposite side of mounting panel 8 of stator 2, carry out identical operations, stator 2 and base plate 7 is fastening.As above, be through with first operation of stator 2 is installed.
Then, from anchor clamps 20, take out stator 2, in the inner chamber of stator 2, insert preassembled rotor 6 (second operation), also have, bearing 9a, 9b are fixed in the support sector 11,12 of frame 10.
Bearing 9a is being embedded under the state of mounting panel 8, for example the support sector 11 of mounting panel 8 and frame 10 is fastening with methods such as welding, spring connections.Like this, finished stepping motor 1 of the present invention.
Fig. 9 is the cut-away section end view of second installation method of expression stepping motor of the present invention.Below this second installation method is described, but to the item identical with above-mentioned first installation method, omit its explanation.
Second installation method is characterised in that, is the position cooperation of yoke 3 and outer yoke 4 in benchmark carries out with the external diameter of stator 2.
At first, same as described above, prepare interior yoke 3 and outside inserted two groups of unit bodies of winding 5 between the yoke 4.
Then, to yoke 3,3 in each of two unit bodies ' base portion 31,31 ' position and engage so that jut 37 and hole 38 ' and hole 38 is chimeric with jut 37 ' difference.The location that stator 2 is inserted into anchor clamps 22 is with in the inner chamber of cylindrical portion 23.Like this, the interior yoke 3 and the outer yoke 4 of two unit bodies carried out the position cooperation so that each magnetic pole 34,44 be with axis 60 for equidistantly, promptly on concentric circles, be configured.
Also have, in advance mounting panel 8 is inserted in the location usefulness cylindrical portion 23 of anchor clamps 20, the position of stator 2 and mounting panel 8 cooperates also carries out simultaneously.
Then, applying pressing force on axis 60 directions on the stator 2 to reduce the gap on composition surface 39 as far as possible, under this state, for example utilize near plasma welding the periphery with composition surface 39, base portion 31 welds respectively with the boundary portion (boundary portion of periphery) of peripheral part 42 and the boundary portion (outer perimeter portion) of outer yoke 4 and mounting panel 8, their fastening (joints) are got up.Also have, base plate 7 is arranged on the opposite side of mounting panel 8 of stator 2, carry out identical operations, stator 2 and base plate 7 is fastening.As above, be through with first operation of stator 2 is installed.
Then, from anchor clamps 22, take out stator 2, same as described above, in the inner chamber of stator 2, insert rotor 6 (second operation), for example utilize methods such as welding, spring connection that the support sector 11 of mounting panel 8 and frame 10 is fastening.Like this, finished stepping motor 1 of the present invention.
Also have, insert rotor 6, can remain on that the bottom opening 26 by anchor clamps 22 carries out under the state that stator 2 is housed in the anchor clamps to the inner chamber of stator 2.
For the effect of the stepping motor 1 of confirming the invention described above, the actuating speed of stepping motor and relation and the actuating speed of stepping motor and the relation of self-starting electric current of torque have been studied.Also have, as a comparative example, Figure 12 and existing stepping motor 100 shown in Figure 13 have also been studied identical characteristic.Curve at Figure 10 and Figure 11 there is shown its result.
Also have, each condition and the measuring condition of each stepping motor 1,100 are as follows.
The external diameter of stator: 10mm
The internal diameter of stator (the present invention): 4.3mm (design load)
The internal diameter of stator (comparative example): 5.3mm (design load)
The height of stator: 10mm
Gap: 0.15mm (design load)
The error in gap (the present invention): less than ± 0.05mm
The error in gap (comparative example): less than ± 0.11mm
The bonded magnet of permanent magnet: Sm-Co ash Magnaglo system
Number of magnetic poles: 10 utmost points * 2 (amounting to for 20 steps)
Winding data: 45 Ω
Given voltage: 5.2V
Driving method: bipolar 2W1-2 phase excitation
As mentioned above, compare with comparative example, the gap error of stepping motor of the present invention is little, the dimensional accuracy height.
Also have, as shown in figure 10, compare with comparative example, stepping motor of the present invention is at the pull-in torque and the pull out torque height of high velocity.Particularly, the maximum self-starting frequency of the stepping motor of comparative example is about 6140Hz when ck imports, and the maximum self-starting frequency of stepping motor of the present invention is about 7680Hz when ck imports, and maximum self-starting frequency improves.Also have, the maximum continuous response frequency of the stepping motor of comparative example is about 16130Hz when ck imports, and the maximum continuous response frequency of stepping motor of the present invention can reach more than the 17280Hz, and maximum continuous response frequency improves.
Also have, as shown in figure 11, compare with comparative example, stepping motor of the present invention is lower at the self-starting electric current (voltage) of high velocity.Particularly, the self-starting electric current of stepping motor of the present invention is about 21mA during ck when input 4000Hz, and the self-starting electric current of the stepping motor of comparative example is greater than 28mA during same frequency, and self-starting electric current of the present invention has also reduced more than 25%.
More than, the installation method of stepping motor of the present invention and stepping motor has been described in accordance with the embodiments illustrated, but the present invention is not limited thereto, and particularly, each composed component that constitutes stepping motor can suitably be replaced as any composed component that can produce said function.
Also have, in the above-described embodiments,, used two groups of unit bodies, but also can use one group or three groups of above unit bodies as stator 2 for improving the stability (balance) on structure and the magnetic circuit.
Also have, the purposes of stepping motor also is not limited to be used in the optical system in the above-mentioned various optical device to focus and draws the lens driving of varifocal, and any purposes can.
Also having, in illustrated embodiment PM type stepping motor is illustrated, but the present invention is not limited to this, also can be VR type or hybrid step motor.
As mentioned above, according to stepping motor of the present invention, the outer peripheral portion of interior yoke base portion is exposed near the outer peripheral face of yoke outside, whereby, and the position cooperation of yoke and outer yoke in can for example carrying out with the internal diameter benchmark.Like this, the dimensional accuracy in the gap between each magnetic pole of stator and rotor improves, and in addition, can also prevent leakage field, and like this, the various characteristics of stepping motor improves.
Also have, because the torque of using lower input value (electric current) to obtain stipulating, so, can save energy, extending battery life, simultaneously, until more the district of high frequency can rotate, therefore, the high speed of driving becomes possibility, and angle precision also improves.
Also have, according to stepping motor of the present invention, not need interior yoke and outside be provided with between yoke above-mentioned step variant part such by himself carrying out the parts that the position cooperates, also have, do not need the such special manufacturing procedure of Precision Machining, so the manufacturing of these parts (processing) becomes easily, can make inexpensively.
Also have, according to the installation method of stepping motor of the present invention, can not make manufacturing process complicated, make the stepping motor of above-mentioned such excellent easily and reliably, can adapt with a large amount of productions.
Industrial utilizability
Stepper motor of the present invention can be used in focusing or draws the lens driving of varifocal etc., so, Can be suitable for installing and using at optical devices such as video camera and television cameras.
Claims (15)
1. stepping motor, it has the stator of the winding that comprises at least one group of interior yoke, outer yoke and be provided with betwixt and rotatably inserts the rotor of this stator inboard, the a plurality of magnetic poles that form on a plurality of magnetic poles that form on the yoke in above-mentioned and the above-mentioned outer yoke alternatively dispose along the outer peripheral face of above-mentioned rotor, it is characterized in that, yoke has its external diameter and the discoid base portion that the external diameter of above-mentioned outer yoke equates substantially in above-mentioned, exposes near the outer peripheral face of the outer peripheral portion of this base portion yoke outside above-mentioned.
2. the stepping motor of claim 1 record is characterized in that, said stator is fixed yoke, outer yoke in two groups and the winding that is provided with betwixt, make above-mentioned in each above-mentioned each base portion of yoke engage.
3. the stepping motors of claim 1 or 2 records is characterized in that, above-mentioned in each magnetic pole of yoke and outer yoke and the outer peripheral face of above-mentioned rotor do not contact, and with above-mentioned rotor pivot be the setting of equidistant position.
4. the stepping motor of claim 1 or 2 records is characterized in that above-mentioned rotor has permanent magnet, and near the external diameter of above-mentioned permanent magnet above-mentioned base portion reduces.
5. the stepping motor of claim 3 record is characterized in that above-mentioned rotor has permanent magnet, and near the external diameter of above-mentioned permanent magnet above-mentioned base portion reduces.
6. the stepping motor of claim 1 or 2 records is characterized in that, on the rotating shaft of above-mentioned rotor leading screw is set.
7. the stepping motor of claim 3 record is characterized in that, on the rotating shaft of above-mentioned rotor leading screw is set.
8. the stepping motor of claim 4 record is characterized in that, on the rotating shaft of above-mentioned rotor leading screw is set.
9. the stepping motor of claim 5 record is characterized in that, on the rotating shaft of above-mentioned rotor leading screw is set.
10. the installation method of a stepping motor is used to install the stepping motor of the arbitrary record of claim 1-9, it is characterized in that:
Comprise
First operation, interior yoke and outside insert winding between yoke, make above-mentioned in yoke and above-mentioned outside the yoke position cooperate and in conjunction with the back being installed by stator,
Second operation is inserted rotor in the inboard of said stator;
It is that benchmark carries out that the above-mentioned interior yoke in above-mentioned first operation and the position of above-mentioned outer yoke cooperate the internal diameter with said stator.
11. the installation method of the stepping motor of claim 10 record is characterized in that, above-mentioned position cooperates by insert anchor clamps in the inner chamber of said stator is undertaken.
12. the installation method of a stepping motor is used to install the stepping motor of the arbitrary record of claim 1-5, it is characterized in that:
Comprise
First operation, interior yoke and outside insert winding between yoke, make above-mentioned in yoke and above-mentioned outside the yoke position cooperate and in conjunction with the back being installed by stator,
Second operation is inserted rotor in the inboard of said stator;
It is that benchmark carries out that the above-mentioned interior yoke in above-mentioned first operation and the position of above-mentioned outer yoke cooperate the external diameter with said stator.
13. the installation method of the stepping motor of claim 12 record is characterized in that: above-mentioned position cooperates by insert said stator in the inner chamber of anchor clamps is undertaken.
14. the installation method of the stepping motor of claim 13 record is characterized in that: the combination of yoke and above-mentioned outer yoke is undertaken by the hole portion that forms on above-mentioned anchor clamps in above-mentioned.
15. the installation method of a stepping motor, being used to install stator and rotor, above-mentioned interior yoke and outer yoke with the winding that comprises interior yoke, outer yoke and be provided with betwixt can not carry out the stepping motor that the position cooperates by himself shape, it is characterized in that:
Comprise
First operation, in above-mentioned yoke and above-mentioned outside insert above-mentioned winding between yoke, use anchor clamps make above-mentioned in the position of yoke and above-mentioned outer yoke cooperate and in conjunction with after, the installation stator,
Second operation is inserted above-mentioned rotor in the inboard of said stator;
It is that benchmark carries out that the above-mentioned interior yoke in above-mentioned first operation and the position of above-mentioned outer yoke cooperate internal diameter or external diameter with stator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15467696 | 1996-06-14 | ||
| JP154676/96 | 1996-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1198853A true CN1198853A (en) | 1998-11-11 |
Family
ID=15589482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97191082A Pending CN1198853A (en) | 1996-06-14 | 1997-06-13 | Stepping motor and method for assembling the same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1198853A (en) |
| WO (1) | WO1997048173A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100555819C (en) * | 2004-11-08 | 2009-10-28 | 亚洲光学股份有限公司 | Stator separating stepping motor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030053976A (en) * | 2001-12-24 | 2003-07-02 | 엘지이노텍 주식회사 | Step motor and fabricating method of the same |
| EP1359656B1 (en) | 2002-04-30 | 2017-12-20 | Johnson Electric Switzerland AG | Electric motor |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60162976U (en) * | 1984-04-04 | 1985-10-29 | 株式会社三協精機製作所 | small motor |
| JPS6126452A (en) * | 1984-07-12 | 1986-02-05 | Copal Denshi Kk | Construction of stator of motor and manufacture thereof |
| JPS6278076U (en) * | 1985-11-05 | 1987-05-19 | ||
| JPH025671Y2 (en) * | 1985-11-19 | 1990-02-09 | ||
| JPH0727823Y2 (en) * | 1986-04-24 | 1995-06-21 | 株式会社シコ−技研 | Servostepping motor with position sensing element |
| JPH0164983U (en) * | 1987-10-19 | 1989-04-26 | ||
| JPH0251352A (en) * | 1988-08-10 | 1990-02-21 | Minebea Co Ltd | Stepping motor |
| JPH0370081U (en) * | 1989-11-06 | 1991-07-12 | ||
| JPH03117372U (en) * | 1990-03-14 | 1991-12-04 | ||
| JPH0428777U (en) * | 1990-06-26 | 1992-03-06 | ||
| JPH0439079U (en) * | 1990-07-30 | 1992-04-02 | ||
| JP2576283B2 (en) * | 1990-11-21 | 1997-01-29 | ブラザー工業株式会社 | Step motor |
| JPH06105525A (en) * | 1992-09-18 | 1994-04-15 | Mitsubishi Materials Corp | Stepping motor |
| JP2560592Y2 (en) * | 1992-12-07 | 1998-01-26 | 株式会社テック | Stepping motor |
| JPH06315256A (en) * | 1993-04-28 | 1994-11-08 | Aisan Ind Co Ltd | Coil bobbin for stepping motor |
| JPH06335226A (en) * | 1993-05-18 | 1994-12-02 | Asmo Co Ltd | Pm type stepping motor |
| JPH07123686A (en) * | 1993-10-25 | 1995-05-12 | Fuji Elelctrochem Co Ltd | Pm-type small-diameter stepping motor |
-
1997
- 1997-06-13 CN CN97191082A patent/CN1198853A/en active Pending
- 1997-06-13 WO PCT/JP1997/002063 patent/WO1997048173A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100555819C (en) * | 2004-11-08 | 2009-10-28 | 亚洲光学股份有限公司 | Stator separating stepping motor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997048173A1 (en) | 1997-12-18 |
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