WO2005022727A1 - ステッパモータ - Google Patents
ステッパモータ Download PDFInfo
- Publication number
- WO2005022727A1 WO2005022727A1 PCT/JP2004/012202 JP2004012202W WO2005022727A1 WO 2005022727 A1 WO2005022727 A1 WO 2005022727A1 JP 2004012202 W JP2004012202 W JP 2004012202W WO 2005022727 A1 WO2005022727 A1 WO 2005022727A1
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- WO
- WIPO (PCT)
- Prior art keywords
- stepper motor
- phase
- pole teeth
- rotor
- spacer
- Prior art date
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Classifications
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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
Definitions
- the present invention relates to a stepper motor, and more specifically, to a drive source for driving a lens incorporated in a micro camera or the like mounted on a portable device such as a cellular phone, which has become popular in recent years.
- the present invention relates to a stepper motor having a configuration in which a stator is extended on both sides of a usable rotor.
- Japanese Patent Laid-Open No. 6-105528 discloses an example of a stepper motor for driving a digital still camera, a video camera and its interchangeable lens, a camera shutter, an aperture device, a focus lens, a zoom lens, and the like.
- a stepper motor for driving a digital still camera, a video camera and its interchangeable lens, a camera shutter, an aperture device, a focus lens, a zoom lens, and the like.
- the stepper motor disclosed in Patent Document 1 overlaps iron cores la of a pair of upper and lower stators 1 together with a coil 2 and forms a temporary positioning formed at the end of each iron core la.
- the convex portions lb are fitted into the elongated holes lc formed in the respective portions.
- the positioning of the stators 1 can be automatically performed, so that a special positioning member is not required and the number of parts can be reduced. As a result, cost reduction and product weight reduction are achieved. In addition, the size can be reduced.
- stators are arranged on both sides of the rotor in order to reduce the thickness and size, and the stator of each phase includes an upper yoke plate and The lower yoke plate is sandwiched between both ends of the coil so that the pole teeth of the yoke plates are meshed vertically. Then, the upper and lower yoke plates are formed integrally via respective connecting portions without separating each phase on both sides of the rotor, and after the assembly is completed, each connecting portion is cut and removed. I have. For this reason, the number of parts can be reduced, and the yoke plates of each phase projecting to both sides of the rotor are integrally formed at the top and bottom. ,. In addition, since each connecting part is cut after assembly is completed, the stator of each phase is separated, preventing loss due to magnetic flux circulating to the other phase side via the connecting part, and maintaining the efficiency of the magnetic circuit high. There is.
- stator is extended in a flat shape which is used as a stepper motor for driving the above-mentioned digital still camera, video camera and its interchangeable lens, camera lens, aperture device, focus lens, zoom lens and the like.
- stepper motor there is JP-A-10-112970 (Patent Document 3).
- stators are arranged on both sides of the rotor for thinness and miniaturization as in Patent Document 2, and the stators of each phase are coiled in a direction along the rotor axis.
- An iron core is disposed at the center of the coil, the upper yoke plate and the lower yoke plate are sandwiched between both ends of the iron core, and the comb-shaped pole teeth of the yoke plates are vertically moved. It adopts a configuration to match.
- the iron core is provided with protrusions at both ends of the iron core and fitted into holes provided at corresponding positions of the upper and lower shock plates.
- it is necessary to simplify the processing in order to reduce costs. Often formed into a cylindrical shape.
- the end of the iron core is fitted into the hole of the yoke plate and fixed by so-called press-fitting.
- Patent Document 1 JP-A-6-105528
- Patent Document 2 JP-A-10-94237
- Patent Document 3 JP-A-10-112970
- the conventional stepper motor disclosed in Patent Document 1 and the like described above has the following problems, although its size has been reduced as compared with the previous structure. That is, in the conventional stepper motor, only the iron core la penetrating through the left and right coils 2 is fixed, and the pole teeth formed on the stator and the reinforcement near the rotor are not taken into consideration. Not guaranteed. That is, for example, the distance (interval) between the pole teeth provided on the pair of upper and lower stators has a great effect on the magnetic characteristics and, consequently, the motor characteristics. Therefore, if distortion occurs around the pole teeth in the central portion of the stator, when the members are combined, the distortion causes a decrease in the accuracy of the distance between the opposing pole teeth.
- the stator is deformed due to impact such as dropping after manufacturing and the gap between the facing pole teeth is reduced.
- the distance will change, and that there will be obstacles due to the contact between the rotor and the pole teeth, reducing reliability.
- the stepper motors become smaller and thinner, the regular distance between the pole teeth itself is becoming shorter, and even if a slight deformation occurs, the effect is large.
- the conventional stepper motor disclosed in Patent Document 3 has the following problem. That is, the hole into which the end of the iron core is fitted is formed by punching the yoke plate by pressing. In the press working, so-called sagging occurs. In a stepper motor that has been made smaller and thinner, the thickness of the yoke plate becomes thinner, so that the influence of the sagging on the plate thickness cannot be ignored, and the fitting portion comes in contact with the end of the iron core. The part becomes only about 1/3 of the plate pressure. Along with this, the effective contact surface is reduced, so that the loss of the magnetic flux is increased in this portion, and the magnetic flux on the stator side is reduced, so that the efficiency of the magnetic circuit is reduced and the output torque is reduced.
- a first object of the present invention is to provide a stepper motor capable of obtaining desired characteristics that are strong against impacts such as dropping even if the size and thickness are reduced.
- a second object of the present invention is to adopt a configuration in which the yoke plates of each phase are integrated, so that there is no need to cut the connecting portion after the assembly is completed, the number of parts can be reduced, and the assemblability is good. It is still another object of the present invention to provide a stepper motor which can keep the efficiency of the magnetic circuit high and can be applied to a very small motor having an extremely small yoke plate. [0017]
- a third object of the present invention is to provide a simple structure, a sufficient effective contact surface at the fitting portion of the iron core to the yoke plate, and an increase in the efficiency of the magnetic circuit. Another object of the present invention is to provide a stepper motor capable of obtaining a high output tonnolek and being preferably applicable to a micro motor.
- a stepper motor includes a pair of yokes arranged such that comb-shaped pole teeth face each other, and a pair of yokes facing the pole tooth plane.
- a stepper motor comprising: a rotor having a multi-pole magnetized permanent magnet mounted thereon; and A-phase and B-phase coils disposed between the pair of yokes and on both sides of the rotor.
- the spacer is provided with a positioning structure for defining a relative position with respect to the yoke.
- This positioning structure corresponds to the positioning dowels 15a, 17a, 20a, and 25a in the embodiment.
- the spacer may be fixed to the yoke by mechanical coupling means.
- spacers separately formed between the A-phase coil and the pole teeth and between the B-phase coil and the pole teeth. It may be formed so as to be located at two places between the phase coil and the pole teeth and between the B phase coil and the pole teeth.
- This invention is realized by the second and third embodiments.
- the spacer is formed in a cylindrical shape so as to cover the entire circumference of the pole teeth. This is realized in the second to fifth embodiments.
- a spacer may be provided on the outer peripheral side of the A-phase and B-phase coils not facing the pole teeth.
- the spacer may be provided separately from the spacer provided between the coil and the pole teeth, or may be provided integrally.
- the auxiliary spacer 22 shown in the fourth embodiment it can be realized by the auxiliary spacer 22 shown in the fourth embodiment.
- integrally formed for example, it can be realized by the spacer 25 shown in the fifth embodiment.
- the material of the spacer is preferably at least a non-magnetic material, and it is preferable that the spacer is composed of an insulator because it is electrically stable and safe. In this case, it is more preferable to use a material that is lighter than metal such as rubber or resin because the weight of the entire motor can be reduced.
- the spacer since the spacer is interposed between the pair of yokes, the distance between the yokes can be accurately defined by the spacer. Therefore, the interval between the opposing pole teeth can be accurately set to a desired state. Furthermore, since the spacer is located between each of the A-phase and B-phase coils and the pole teeth, the spacer is placed close to the pole teeth, so even if the yoke is loaded with gravity, The gap between the pole teeth is not changed due to the deformation of the yoke. Therefore, the dimensional accuracy and thus the motor characteristics can be maintained in a desired state for a long period of time.
- the number of components can be reduced.
- the positioning structure integrally with the spacer, highly accurate positioning can be performed. it can.
- the simplification of assembly work by reducing the number of parts can be achieved by increasing the contact area with the yoke, which can be reduced by force, to further improve the strength. Furthermore, by increasing the area that covers the periphery of the pole teeth, entry of dust and the like can be suppressed. By making the spacer cylindrical, the above two effects can be maximized. Further, by providing a spacer outside the coil, the strength is further increased.
- a stepper motor has a rotor made of permanent magnets magnetized in multiple poles, and at least two A-phase and B-phase stators are connected to both rotors of the rotor.
- a stepper motor arranged so as to protrude to the side, wherein the stator has a coil in a direction along the rotor axis, and an upper yoke plate and a lower yoke plate having pole teeth cross-sectionally formed on the rotor are provided at both ends of the coil.
- the A-phase stator and the B-phase stator are integrally connected by a connecting portion extending the end of the facing edge of each of the upper and lower yoke plates with respect to each other.
- the connecting portion is formed only on the side where the interval between the adjacent pole teeth is wide at two locations facing each other with the rotor therebetween, and the cross section facing the magnetic flux in the yoke plate has the minimum size in the connecting portion.
- the relationship between the cross-sectional area Ac of the pole tooth and the cross-sectional area At of the root of the pole tooth is expressed as
- the connecting portion is formed only on the side where the interval between the adjacent pole teeth is narrow at two locations facing each other with the rotor therebetween, and the cross section facing the magnetic flux in the yoke plate has the minimum size in the connecting portion.
- the relationship between the cross-sectional area Ac of the pole tooth and the cross-sectional area At of the root of the pole tooth is expressed as Ac / At ⁇ 0.5.
- the connecting portion is formed at two locations facing each other with the rotor interposed therebetween.
- a minimum sectional area Ac at each connecting portion and the pole The relation with the root cross-sectional area At
- the connecting portion may be a portion having deteriorated magnetic properties or a portion having low magnetism. Further, the magnetic characteristics of the connecting portion can be adjusted by performing a strain process after the heat treatment on the yoke plate.
- the yoke plates of each phase are integrated, so that the number of parts can be reduced and the number of assembling steps can be reduced.
- the stators of each phase can be correctly positioned, thereby improving the assemblability and improving the productivity.
- the yoke plate has a disadvantage that the magnetic flux goes around to the other phase through the connecting portion, and there is a disadvantage that the efficiency of the magnetic circuit is reduced due to the loss. This loss can be suppressed low by setting the cross-sectional area of the connecting portion small.
- connection portion providing the rotor at only one location between the rotors is advantageous in terms of reducing the loss of the magnetic circuit. By providing such a member, rigidity can be increased, and distortion of the yoke plate can be prevented to improve positioning accuracy.
- the portion can be a portion having deteriorated magnetic characteristics or a portion having low magnetism, and the magnetic portion of the connecting portion can be made magnetic. Since the resistance is increased, it is possible to sufficiently prevent the magnetic flux from flowing to the other phase side via the connection portion, and to keep the efficiency of the magnetic circuit high.
- a stepper motor has a rotor composed of permanent magnets magnetized in multiple poles, and has A-phase and B-phase stators projecting to both sides of the rotor.
- a stepper motor wherein the stator has a coil in a direction along the rotor axis, the coil has an iron core disposed at the center, and has a comb-shaped pole tooth facing the rotor.
- the iron core has an end fitted to a predetermined position of the yoke plate.
- the fitting portion is provided with a linking means for increasing the contact surface with the end of the iron core.
- the linking means forms a through-hole at the fitting portion, and provides a cylindrical protrusion with a perforated paddle or the like in the through-hole.
- the protrusion has an end portion of the iron core. It is good to adopt a configuration that fits.
- the linking means may have a configuration in which a recess is formed in the fitting portion by drawing or the like, and an end of the iron core is fitted into the recess.
- the tip of the iron core may be formed in a tapered shape, and the inner surface of the fitting portion may be formed at an angle corresponding to the tapered shape.
- the linking means may be provided with a cylindrical portion in a cylindrical shape by deep drawing or the like at the fitting portion, the cylindrical portion may have a tip formed as a through hole, and an end of the iron core may be fitted into the cylindrical portion. It is preferable that the cylindrical portions are in contact with each other between the upper yoke plate and the lower yoke plate.
- the iron core is fixed by press-fitting by fitting the end of the iron core into the fitting portion of the yoke plate, but the fitting portion has a contact surface with the end of the iron core. Therefore, an effective contact surface in the fitting relationship can be secured.
- a cylindrical projection is provided in a through hole formed in a fitting portion by a burring paddle or the like, so that the height of the projection is equal to the height of the end of the iron core. The contact surface can be reduced.
- the structure is simple because only a cylindrical projection is provided by burring or the like, and an effective contact surface can be sufficiently secured at a fitting portion of the iron core to the yoke plate.
- a concave portion is provided by drawing or the like at the fitting portion, and the end of the iron core is fitted into the concave portion, so that the yoke plate also comes into contact with the end surface of the iron core to increase the contact surface. S can.
- the area increases by the amount of the tapered shape, so that the contact surface is increased. Can be increased.
- a cylindrical portion is provided in a cylindrical shape by deep drawing or the like at a fitting portion, the tip of the cylindrical portion is formed in a through hole, and an end of an iron core is fitted into the cylindrical portion. When they are aligned, the contact surface with the end of the iron core can be increased by the height of the cylindrical portion.
- the cylindrical portions are set to be in contact with each other between the upper yoke plate and the lower yoke plate, the cylindrical portion comes into contact with the entire circumference of the iron core, and the contact surface can be maximized.
- the spacer is interposed between the ⁇ -phase and B-phase coils and the pole teeth, so that the stepper motor can be reduced in size and thickness.
- the spacer since the distance between the yokes and the distance between the opposing pole teeth are accurately maintained by the spacer, it is possible to obtain desired motor characteristics that are strong against impacts such as dropping.
- the yoke plate is integrated with respect to the A phase and the B phase, so that there is no need to cut the connecting portion after the assembly is completed. For this reason, the number of parts can be reduced and the assemblability is good, and by setting the cross-sectional area of the connecting portion small, the efficiency of the magnetic circuit can be kept high, and as a result, the yoke plate is extremely small and extremely small It can be preferably applied to a motor.
- the end of the iron core is formed of the yoke plate. It is fitted into the fitting part and fixed by press-fitting. However, since the fitting part is provided with a linking means for increasing the contact surface with the end of the iron core, effective contact is obtained in the fitting relationship. Surface can be secured.
- a cylindrical projection is simply provided by a burring cage or the like in a through hole formed at a fitting portion, so that the structure is simple, and the height of the projection is equivalent to an iron core.
- the contact surface with the end of this can be increased.
- the magnetic flux easily passes and the magnetic resistance decreases, so that the efficiency of the magnetic circuit can be increased and the output torque can be increased.
- it can be preferably applied to a micro motor.
- FIG. 2 is an exploded perspective view of the first embodiment of the present invention.
- the center of the pair of upper and lower yokes 10, ic is opened in a substantially circular shape, and the opened opening
- a comb-shaped pole tooth 11 is formed along the inner peripheral edge of 10a, 10a '.
- the pole teeth 11, 11 ' are alternately arranged at a desired distance when a pair of yokes 10, 1 (/ are opposed to each other. Then, the pole teeth 11, 11' are Thus, they are formed integrally with the yokes 10, 1 (.
- the rotor 12 is mounted in a space partitioned by the pole teeth 11 and I.
- the rotor 12 includes a permanent magnet that is multipolarly magnetized so as to face the plane of the pole teeth 11 and 11 '.
- the axis of rotation of the rotor 12, a pair of upper and lower yokes 10, 10 r of the opening 10a, protrudes from than 10a ', is ⁇ the illustrated omitted bearing, it is rotatably supported.
- the stepper motor of the present embodiment constitutes a claw-pole type stepper motor.
- the A-phase and B-phase coils 13 are configured to be arranged on both left and right sides of the rotor 12. That is, the coil 13 has a coil bobbin 13a for winding a coil winding wire. A magnetic iron core 13b for forming a magnetic circuit is inserted into the center hole of the coil bobbin 13a. And, at both ends of the yokes 10, 1 ( ⁇ ), iron core press-fitting holes 10b, 10b 'are provided at positions facing the iron core 13b inserted into the coil bobbin 13a.
- a spacer 15 having a non-magnetic material is provided between the upper and lower yokes 10, 1 (between the poles 11, 11 ′ and A Between the coils 13 of the phase and phase B.
- two separate spacers 15 were provided between each coil 13 and the pole teeth 11, 1 11 adjacent to the coil 13.
- the side surface is shaped so as to be depressed in an arc along the surfaces of the pole teeth 11, 11 ′ and the coil 13.
- the pole teeth 11, 11 ′ and the A phase As much as possible in the space between the coils 13 of phase B and B, and in contact with the pole teeth 11 and 11 '.
- a positioning dowel 15a is provided at one end, and a fixing hole 15b is provided at the other end.
- the yoke 10 is provided with positioning holes 10c and 10 at positions facing the positioning dowels 15a and through holes 10d and 10cT at positions facing the fixing holes 15b.
- the fixing screw 16 is inserted into the through-hole 10d and the fixing hole 15b, thereby being fixed by screwing, and the spacer 15 and the yoke 10 are integrated.
- the fixing screw 16 'into the through hole 10d' and the fixing hole formed on the lower surface of the spacer 15 it is screwed and fixed, and the spacer 15 and the yoke 1 (/ are integrated.
- the pair of upper and lower yokes 10 and llT are connected with the spacer 15 interposed therebetween, and the yokes 10 and l (are in surface contact with the upper and lower surfaces of the space 15, respectively.
- the distance between the pair of upper and lower yokes 10 and liy is accurately determined by the height of the spacer 15.
- the distance between the pole teeth 11 and 11 ' can be accurately set to a desired value.
- the spacer 15 can be formed by, for example, integral molding of a resin using a mold, whereby the positioning and size of the positioning dowel 15a and the fixing hole 15b can be achieved.
- the shape can be formed with high accuracy.
- the positioning accuracy of the positioning holes 10c, 10 and the through holes 10d, 10d ; formed in the yokes io, ic by press working can be improved, and the yoke 10, l ( The relative positional relationship of each part on the side 15 can be configured with high accuracy.
- the positioning structure of the spacer 15 is not limited to the positioning dowel 15a integrally formed with the spacer 15 described in the above embodiment.
- a positioning pin 15c can be provided.
- the positioning pins 15c can be integrally formed by, for example, insert molding at the time of manufacturing the spacer 15, and the positioning can be accurately performed according to the manufacturing method based on the insert mol degree.
- a positioning recess 15d may be provided instead of the positioning dowel 15a.
- a projection is provided instead of the positioning holes 10c, 10c 'formed in the yoke 10.
- the fixing screws (self-tapping screws) 16, 16 ′ are used as the fixing structure (mechanical coupling structure) of the upper and lower yokes 10, 1 (/.
- the present invention is not limited to this.
- a dowel 19 is integrally formed instead of the fixing hole 15b of the spacer 15 and the dowel 19 is formed through the through hole 10d.
- the dowel 19 may be welded and fixed by the melted and crushed dowel 19, as shown in FIG. And the lower side can have the same configuration.
- adhesive pools are provided at predetermined positions on the upper surface and the lower surface of the spacer 15, and when the yoke 1 (/ is in contact with the spacer 15, the adhesive pool is formed on the adhesive pool.
- the yoke 1 ( ⁇ and the spacer 15 can be bonded and integrated.
- the yoke ic and the spacer 15 can be fixed by welding without using an adhesive.
- the mechanical coupling structure is the same as that of the upper and lower yokes 10, 1 Both 0's are forces that have the same structure. Of course, both sides may be different.
- FIG. 6 shows a second embodiment of the present invention.
- This embodiment is based on the first embodiment, and changes the shape of the spacer. That is, in the first embodiment, two spacers 15 are prepared, and between the A-phase coil 13 and the pole teeth 11, ll r and between the B-phase coil 13 and the pole teeth 11, 11 ′. In this embodiment, a single spacer 17 is used to install each part.
- the spacer 17 is formed in a cylindrical shape, and the inner diameter of the central through hole 17c is set to be slightly larger than the outer shape around the pole teeth 11 and I. As a result, the entire circumference of the pole teeth 11 and I can be covered with the spacer 17. With such a configuration, the spacer 17 is located near the entire circumference of the pole teeth 11 and I, the connection portion with the yokes 10 and 1 ( ⁇ ) is increased, and the strength is further improved. It becomes stronger and can prevent deformation.
- the connecting structure of the spacer 17 and the yokes 10, 1 (/) is provided at predetermined positions on both the upper and lower surfaces of the spacer 17 at the positioning dowels 17a.
- the fixing holes 17b are provided, and the positioning dowels 17a are aligned with the positioning holes 10c, 10c 'provided in the yokes 10, 1 (to be positioned, and the axial centers of the through holes 10d and the fixing holes 17b are aligned. It is possible to adopt a configuration in which the screws are fixed with the fixing screws 16, 16 'in the matched state, and the other configuration and operation and effect are the same as those of the first embodiment described above.
- the same reference numerals are given to the same members, and the detailed description thereof will be omitted.
- FIG. 8 shows a third embodiment of the present invention.
- a spacer 20 is used in which a part of the cylindrical spacer 17 in the second embodiment is cut away to form a substantially U-shaped planar shape.
- the spacer 20 of the present embodiment can be said to have a shape in which the two spacers 15 in the first embodiment are connected at one end.
- the dimensions of the inner peripheral surface of the spacer 20 are set to be slightly larger than the outer dimensions around the pole teeth 11 and I, and the spacer 20 covers at least half the circumference of the pole teeth 11 and H '. Will be able to.
- the spacer 20 and the yokes 10, 10 are different from those of the first embodiment.
- connection between the yoke io and ic can be prevented, and the strength is further improved, and the yokes io and ic can be prevented from being deformed.
- the coupling structure between the spacer 20 and the yokes 10 and 1C is similar to that of the first and second embodiments.
- 20a and fixing holes 20b are provided, and the positioning dowels 20a are aligned with the positioning holes 10c and 10c 'provided on the yokes 10 and 1 (for positioning, and the shafts of the through holes 10d and the fixing holes 20b are provided.
- the other configurations and operational effects are the same as in the first and second embodiments described above. Therefore, the corresponding members are denoted by the same reference numerals, and detailed description thereof will be omitted, and it is needless to say that modifications of the above embodiments can be applied to the present embodiment.
- FIG. 9 shows a fourth embodiment of the present invention.
- the basic configuration is the second embodiment, and the auxiliary spacer is also provided near the outside of the A-phase and B-phase coils 13 (on the side not facing the pole teeth 11 and ⁇ '). 22 were provided.
- the auxiliary spacer 22 has an arc-shaped plane shape, and upper and lower surfaces thereof are in surface contact with the yokes 10, 1C.
- the auxiliary spacer 22 and the yokes 10, ic are integrally formed by various coupling structures. Be transformed into
- FIG. 10 shows a fifth embodiment of the present invention.
- a spacer is also provided near the outside of the coil 13, and a spacer 17 and two auxiliary spacers 22 are provided.
- a spacer 25 integrally formed with the spacer is used.
- the spacer 25 has a through hole 25c in the center for inserting and positioning the pole teeth 11, 11 ′ and the rotor 12, and a coil through hole 25d on each of the left and right sides of the through hole 25c.
- the A-phase and B-phase coils 13 are inserted into the coil through-holes 25d.
- the strength of the yokes 10, 1 (/) around the coil 13 is further improved, and the proof stress against the load is further increased.
- this stepper motor is mounted on a mobile phone or the like, the portable It can more reliably withstand the impact of a fall of a telephone, etc.
- the auxiliary spacer 22 is separately provided as in the fourth embodiment, the auxiliary spacer is fixed and connected.
- the functional portion corresponding to the auxiliary spacer 22 is incorporated in one spacer 25, the connection with the yokes 10 and 10 ' Can be simplified.
- positioning dowels 25a and fixing holes 25b are provided at predetermined positions on both the upper and lower surfaces of the spacer 25, and positioning dowels 25a are provided on the yokes 10, 10 ′.
- with positioning by sign can take a configuration in which screwed in fixing screw 16, 16 r in a state in which the axis was allowed one Itasa of the through hole 10d and the fixing holes 25b in. Since other configurations, functions, and effects are the same as those of the above-described embodiments, corresponding members are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, it is needless to say that the modifications of the above embodiments can be applied to the present embodiment.
- a non-magnetic insulator is used as a material of the spacer in each of the above embodiments. It is good to configure. At this time, for example, it is preferable to use a resin material such as plastic or rubber which is lighter than metal, because it is possible to reduce the weight and to reduce the impact when dropped. In addition, the use of these materials does not affect the characteristics of the electric circuit.
- the yokes 10, 10 ' are fixed to a motor mounting flange or the like, not shown, and then cut to the A-phase side and the B-phase side as shown in Fig. 11 to prevent the magnetic path from wrapping around.
- the characteristics can be improved.
- the yoke may be narrowed instead of being cut.
- both sides of the connecting portion are cut or the width is reduced, but it is also possible to perform the processing on only one side. It is also good to cut one and reduce the width of the other.
- the examples shown in FIGS. 11 and 12 are based on the first embodiment, but can be applied to other embodiments and various modifications.
- FIG. 13 shows a sixth embodiment of the present invention.
- the stepper motor has a rotor 101 made of a multi-pole magnetized permanent magnet, and two A-phase and B-phase statusers SI and S2 are arranged so as to protrude on both sides of the rotor 101.
- Each of the stators SI and S2 has a coil 102 in a direction along the axis of the rotor 101, and an upper yoke plate 103 and a lower yoke plate 103 having comb-like pole teeth (130, 140) facing the rotor 101. 4 is sandwiched between both ends of the coil 102 so that the pole teeth (130, 140) are vertically engaged with each other, so that a so-called claw pole type stepper motor is obtained.
- the upper yoke plate 103 and the lower yoke plate 104 have the same shape and configuration, and as shown in Fig. 14, the same components are assembled vertically.
- the yoke plate 103 (104) has a strip shape curved in a substantially arc shape, and has a row of pole teeth 130 (140) at the center opening edge.
- the yoke 131 (141) and the other become the yoke 132 (142) on the B-phase side, and the A-phase and the B-phase are connected parts 133, 134 (143, 144) extending both ends of the facing edges. )
- the upper and lower yoke plates 103 and 104 face each other, the rotor 101 is arranged in the center opening, and the coils 102 and 102 are arranged and assembled on both sides for the ⁇ phase and the B phase.
- the pole teeth 130 and 140 mesh with each other on the outer periphery of the rotor 101 to form a magnetic pole (inductor). It is a claw-pole type, and is a flat stepper motor in which two stators SI and S2 protrude on both sides of the rotor shaft 110.
- the shaft 110 of the rotor 101 is configured to be fitted to and supported by a bearing (not shown), and the stators SI and S2 are attached to a support that maintains a relative position with respect to the bearing. Further, an iron core 102a is inserted into the shaft of the coil 102.
- connection portion can be set at two places surrounding the rotor 101.
- a configuration is adopted in which connecting portions 133, 134 (143, 144) are formed at these two locations. Then, regarding the cross section facing the magnetic flux in the upper and lower yoke plates 103 and 104, the minimum cross sectional area Ac at each of the connecting portions 133 and 134 (14 3, 144) and the cross sectional area At at the root of the pole teeth 130 (140) The relationship
- the A-phase side yoke portion 131 (141) and the B-phase side yoke portion 132 (142) are integrated by the connecting portions 133, 134 (143, 144).
- the magnetic flux wraps around to the other phase side through the connecting portions 133 and 134 (143 and 144), and the loss due to this causes the efficiency of the magnetic circuit to decrease.
- This loss can be suppressed by setting the cross-sectional area Ac of the connection parts 133 and 134 (143, 144) small, and the torque reduction rate is reduced with respect to the ratio of the cross-sectional area to the inductor side (Ac / At). It has been confirmed that the characteristics are as shown in Fig. 15.
- the torque reduction rate will be 10% or less, and the dynamic torque is greatly affected by friction and heat. Therefore, if the torque reduction rate is 10% or less, It is included in the error, and the effect of the torque decrease becomes so small as to be negligible.
- the connecting portions 133, 134 (143, 144) are formed by providing a portion having a small cross-sectional area with respect to the cross section facing the magnetic flux. That is, as shown in FIG. 16 (a), the connecting portions 133, 134 (143, 144) of the yoke plates 103, 104 can be provided with a thin portion 105 by means of pre-scaling or tensioning, or as shown in FIG. As shown in Fig. 16, a thin part 105 is provided by notch processing, and as shown in Fig. 16 (c), a half-blanking processing is performed to provide unevenness to reduce the cross-sectional part 106 facing the magnetic flux. By performing appropriate processing, The section having a small cross-sectional area with respect to the cross section facing the magnetic flux is used.
- connecting portions 133, 134 can be formed as shown in 017 (a) and (017). That is, as shown in FIG. 17 (a), the width of the relevant portion is reduced, or as shown in FIG. Should be appropriately reduced.
- connection portions 133, 134 cause magnetic saturation due to high magnetic resistance, which may be a portion having degraded magnetic properties or a portion having low magnetism, and may cause the portions to be affected. Virtually, it can be treated as a magnetic permeability of air. In order to degrade the magnetic properties or make the magnetic properties low, it is possible to adjust the magnetic properties by performing strain processing after heat treatment (annealing) on the upper and lower yoke plates 103, 104. The distortion processing can be performed by performing the processing shown in FIGS. 16A to 16C described above. As a result, residual stress remains in the connecting portions 133, 134 (143, 144) of the respective phases, and the magnetic characteristics deteriorate.
- the connecting parts 13 3, 134 are provided at both two places with the rotor 101 between them, so rigidity can be increased, and distortion of the upper and lower yoke plates 103, 104 is prevented, and positioning accuracy is improved. it can.
- connection portions 133 and 134 are formed after heat treatment on the upper and lower yoke plates 103 and 104 for the connection portions 133 and 134 (143 and 144). Since the portion can be made to have low magnetism and the magnetic resistance of the connecting portions 133 and 134 (143, 144) increases, the magnetic flux flows to the other phase through the connecting portions 133 and 134 (143, 144). Can be sufficiently suppressed, and the efficiency of the magnetic circuit can be kept high.
- the upper and lower yoke plates 103 and 104 integrated for the A phase and the B phase have the same shape at the top and bottom, so that the use of two identical parts can reduce the cost and improve the productivity. That can be S.
- the upper and lower yoke plates 103, 104 are integrated into the power phase and the B phase, so that the assemblability is good and the connecting parts 133, 134 (143, 144)
- the cross-sectional area Ac By setting the cross-sectional area Ac to be small, the efficiency of the magnetic circuit can be kept high. As a result, it is suitable for micro motors with extremely small yoke plates. Can be applied better.
- FIG. 18 shows a seventh embodiment of the present invention.
- the connecting portions of the upper and lower yoke plates 103 and 104 are formed only at one end of the facing edges of the A phase and the B phase, and the other is cut off.
- the same components as those in the above-described sixth embodiment are denoted by the same reference numerals, and description thereof will be omitted.
- the upper and lower yoke plates 103 and 104 are curved in a substantially arc shape as described above, and the positional relationship of the pole teeth 130 (140) is adjusted in each phase at the center opening edge. Therefore, the two connecting parts 133 and 134 (143, 144) are two sides of the narrow side d3 and the wide side d4 between the adjacent pole teeth 130 (140), and here, the connecting part is connected to the wide side d4. 134 (144) is provided to cut off the narrow side d3.
- connecting portions 134 (144) are provided only at one location between the rotors 101, there is an advantage in reducing the loss of the magnetic circuit, and high torque can be expressed. From application to micro motors is preferred.
- FIG. 19 shows an eighth embodiment of the present invention.
- the connecting portions of the upper and lower yoke plates 103 and 104 are formed only at one end of the facing edge of the A-phase and the B-phase, and the other is cut off. Contrary to the seventh embodiment, it is provided only on the narrow side d3.
- the same components as those in the above-described sixth embodiment are denoted by the same reference numerals, and description thereof will be omitted.
- the connecting portion 133 (143) is formed only on the side d3 where the interval between the pole teeth 130 (140) adjacent to each other with the rotor 101 interposed therebetween is narrow, and is cut off on the wide side d4.
- the relationship between the minimum cross sectional area Ac at the connection part 133 (143) and the cross sectional area At of the root of the pole tooth 130 (140) is expressed by:
- the connecting portion 133 (143) is provided only at one location between the rotors 101, thereby reducing the loss of the magnetic circuit. Therefore, the application to a micro motor is preferred because it is advantageous in that it can achieve high tonnolek.
- FIG. 20 shows a ninth embodiment of the present invention.
- the stepper motor has a rotor 201 made of multi-pole magnetized permanent magnets, and two (A-phase and B-phase) statuses Sa and Sb are symmetrically stretched on both sides of the rotor 201.
- a configuration is adopted in which it is put out and placed.
- Each of the stators Sa, Sbf and the rotor 201 has a car core 202.
- An iron core 220 is disposed at the center of the core 202, and a comb-shaped pole tooth facing the rotor 201 is provided.
- An upper yoke plate 203a (203b) provided with 205 and a lower yoke plate 204a (204b) are sandwiched between both ends of the iron core 220 so that the pole teeth 205 are engaged vertically, and a so-called claw pole type stepper motor is obtained. ing.
- the phase A side and the phase B side are formed separately.
- the A-phase upper yoke plate 203a and the B-phase lower yoke plate 204b have substantially the same shape and configuration, and the A-phase lower yoke plate 204a and the B-phase upper yoke plate 203b have substantially the same shape and configuration. They are identical, and they are turned upside down, as shown in FIG. That is, each of the yoke plates 203a, 204a, 203b, and 204b has a fitting portion 206 for fitting the iron core 220 in a strip shape curved into a substantially arc shape, and has a comb-like shape at an end facing the rotor 201.
- a row of pole teeth 205 is formed, and the pole teeth 205 are vertically held by being sandwiched between both ends of the iron core 220, and the mating side faces the rotor 201.
- the shape of each of the yoke plates (203a, 204b) and (203b, 204a) is slightly different depending on the separating position.
- fitting portion 206 is formed in a through-hole, and the tip of iron core 220 is fitted and press-fitted.
- the fitting portion 206 has a linking means for increasing the contact surface with the end of the iron core 220. That is, as shown in FIG. 22, the linking means forms a through hole in the fitting portion 206, and a cylindrical protrusion 225 is provided in the through hole by a burring cartridge or the like, and the protrusion 225 has an iron hole. The end of the core 220 is fitted.
- Forming the protruding part 25 25 f, the front and back of the yoke plates 203 a, 204 a, 203 b, and 204 b (this can be done by any of the following rules (they can be extended and provided as shown in FIG. 22 (a)).
- the sagging portion on the back side of the protruding portion 225 may be subjected to compression molding to make the sagging portion a right angle to secure the contact surface.
- Assembling is performed by previously fitting the ends of the iron cores 220, 220 to one of the upper and lower yoke plates 203a, 204a, 203b, 204b in the fitting portion 206 and fixing them.
- Coinoles 202 and 202 are attached to 220, and the other end of iron core 220 is fitted with and fixed to fitting portion 206 of the yoke plate of Tsukuda J facing each other, and each stator is assembled. And place them facing each other.
- the comb-shaped pole teeth 230 and 240 mesh with each other on the outer periphery of the rotor 201 to form a claw pole (inductor), and the two stators Sa and Sb are provided on both sides of the rotor shaft 210. It becomes a flat stepper motor that overhangs.
- the shaft 210 of the rotor 201 is configured to be fitted to and supported by a bearing (not shown), and the stators Sa and Sb are attached to a support that maintains a relative position with respect to the bearing.
- the iron core 220 is fixed to the fitting portion 206 of the yoke plates 203a, 204a, 203b, and 204b by press-fitting the ends of the ends into the fitting portions 206.
- a cylindrical projection 225 is provided in the through hole formed in the fitting portion 206 by burring or the like, so that the height of the projection 225 is increased. That is, the effective height excluding the sagged portion generated by the working can increase the contact surface with the end of the iron core 220.
- the cylindrical projection 225 is merely provided by burring or the like, the structure is simple, and the effective contact surface at the fitting portion of the iron core 220 to the yoke plates 203a, 204a, 203b, 204b. Can be secured sufficiently. For this reason, the magnetic flux easily passes and the magnetic resistance decreases, so that the efficiency of the magnetic circuit can be increased, and a high output tonolek can be obtained. As a result, it can be preferably applied to a micro motor.
- FIG. 23 shows a main part of a tenth embodiment of the present invention.
- the fitting portion 206 has a configuration in which a concave portion 226 is provided by drawing or the like in a portion which is not formed in the through hole, and the end of the iron core 220 is fitted into the concave portion 226.
- the concave portion 226 is fitted to the end of the iron core 220, it also contacts the end surface of the iron core 220, and the contact surface increases. Therefore, the contact surface is increased due to the contact of the end surface of the iron core 220, so that sufficient contact can be ensured even in shallow drawing. Conversely, the drawing depth can be made shallower than that of the projection 225 formed by the burring pad according to the ninth embodiment.
- the depth inside the concave portion 226 is the effective length of the depth Y excluding the sagged portion of the processing contacting the periphery of the iron core 220, , 204a, 203b, 204b is related to thickness X
- FIG. 25 is a graph showing the relationship between the setting of the depth of drawing and the increase rate of the tonnolec obtained in the output.
- the fitting portion 206 is provided with the concave portion 226 by drawing or the like, and the end of the iron core 220 is fitted into the concave portion 226. Therefore, the yoke plates 203a, 203 04a, 203b, and 204b come into contact, and the contact surface can be increased. Therefore, the magnetic flux easily passes and the magnetic resistance is reduced, so that the efficiency of the magnetic circuit can be increased and the output torque can be increased. As a result, it can be preferably applied to a micro motor.
- the yoke plates 203a, 204a, 203b, and 204b can be kept at a high angle. Then, since the end of the iron core 220 is fitted into the concave portion 226, In this case as well, it is possible to prevent the fitting into the falling posture, and the assembling can be performed with high accuracy.
- FIG. 26 shows an eleventh embodiment of the present invention.
- the tip of the iron core 220 is formed to have a tapered shape
- the fitting portion 206 has an inner surface formed at an angle corresponding to the taper shape.
- the fitting portion 206 As the fitting portion 206, as shown in FIG. 26 (a), there is a configuration in which the inner periphery of the through hole is tapered so that the tapered tip of the iron core 220 fits into the corresponding surface. Further, as shown in FIG. 26 (b), when the projection 225 is formed by a burring paddle or the like, the fitting portion 206 is tapered into the projection 225, As shown in FIG. 26 (c), when forming the concave portion 226 by drawing or the like, taper forming is performed on the concave portion 226.
- the iron core 220 may be configured to have a corresponding surface on which the tapered tip of the iron core 220 fits.
- the tip of the iron core 220 is formed in a tapered tapered shape, and is fitted to the corresponding tapered fitting portion 206. And the contact surface can be increased. Therefore, the magnetic flux easily passes and the magnetic resistance is reduced, so that the efficiency of the magnetic circuit can be increased and the output torque can be increased. As a result, it can be preferably applied to a micro motor.
- FIG. 27 shows a twelfth embodiment of the present invention.
- the linking means is such that the fitting portion 206 is provided with a cylindrical portion 227 in a cylindrical shape by deep drawing or the like, and the cylindrical portion 227 has a tip formed in a through-hole, A configuration is adopted in which the end of the iron core 220 is fitted to the part 227.
- the cylindrical portion 227 is set to be in contact with both the upper yoke plate 203a (203b) and the lower yoke plate 204a (204b).
- the contact surface with the end of the iron core 220 can be increased by the height of the cylindrical portion 227.
- the cylindrical portion 227 is in contact with both the upper yoke plate 203a (203b) and the lower yoke plate 204a (204b)
- the cylindrical surface 227 comes into contact with the entire circumference of the iron core 220, and the contact surface is maximized. Can be.
- the magnetic flux easily passes, and the magnetic resistance decreases, so that the efficiency of the magnetic circuit can be increased and the output tonolek can be increased.
- it can be preferably applied to a micro motor.
- the basic structure of the stepper motor shown in FIGS. 20 and 21 can be of various types, for example, by connecting an A-phase and a B-phase stator to a force unit having a completely separated configuration.
- FIG. 1 is an exploded perspective view showing a conventional example.
- FIG. 2 is an exploded perspective view showing a first embodiment of a stepper motor according to the present invention.
- FIG. 3 is a view showing a modified example of a spacer.
- FIG. 4 is a diagram showing an example of a joint structure of a spacer and a yoke.
- FIG. 5 is a diagram showing an example of a joint structure of a spacer and a yoke.
- FIG. 6 is an exploded perspective view showing a second embodiment of the present invention.
- FIG. 7 is an exploded perspective view showing a modification of the second embodiment of the present invention.
- FIG. 8 is an exploded perspective view showing a third embodiment of the present invention.
- FIG. 9 is an exploded perspective view showing a fourth embodiment of the present invention.
- FIG. 10 is an exploded perspective view showing a fifth embodiment of the present invention.
- FIG. 11 is an exploded perspective view showing a modification of the stator according to the present invention.
- FIG. 12 is an exploded perspective view showing a modification of the present invention.
- FIG. 14 is an exploded perspective view showing the stepper motor of FIG. 13.
- FIG. 15 is a graph showing a relationship between a cross-sectional area of a connecting portion and a torque reduction rate.
- FIG. 16 is a cross-sectional view showing an example of a shape of a connecting portion and showing a cut surface in a connecting direction.
- FIG. 17 is a plan view showing an example of the shape of a connecting portion and an enlarged view of the portion.
- FIG. 18 is a perspective view showing a stepper motor according to a seventh embodiment of the present invention.
- FIG. 19 is a perspective view showing an eighth embodiment of the stepper motor according to the present invention.
- FIG. 20 is a perspective view showing a ninth preferred embodiment of the stepper motor according to the present invention.
- FIG. 21 is an exploded perspective view showing the stepper motor of FIG. 20.
- FIG. 22 is cross-sectional views (a), (b), and (c) showing a joint portion between a yoke plate and an iron core.
- FIG. 23 is a cross-sectional view of a stepper motor according to a tenth embodiment of the present invention, showing a joining portion between a yoke plate and an iron core.
- FIG. 24 is a cross-sectional view of a fitting portion of a yoke plate showing an effective depth in drawing.
- FIG. 25 is a graph showing the relationship between the setting of the depth of drawing and the rate of increase in the torque obtained in the output.
- FIG. 26 is cross-sectional views (a), (b), and (c) showing a stepped motor according to an eleventh embodiment of the present invention, showing a joining portion between a yoke plate and an iron core.
- FIGS. 27A and 27B are sectional views (a) and (b) of a stepper motor according to a twelfth embodiment of the present invention, showing a joining portion between a yoke plate and an iron core.
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Abstract
Description
Claims
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2003-308065 | 2003-08-29 | ||
JP2003308065A JP2005080413A (ja) | 2003-08-29 | 2003-08-29 | ステッパモータ |
JP2003335571A JP4405771B2 (ja) | 2003-09-26 | 2003-09-26 | ステッピングモータ |
JP2003-335571 | 2003-09-26 | ||
JP2004108389A JP2005295709A (ja) | 2004-03-31 | 2004-03-31 | ステッピングモータ |
JP2004-108389 | 2004-03-31 |
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WO2005022727A1 true WO2005022727A1 (ja) | 2005-03-10 |
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PCT/JP2004/012202 WO2005022727A1 (ja) | 2003-08-29 | 2004-08-25 | ステッパモータ |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6447571U (ja) * | 1987-09-17 | 1989-03-23 | ||
JPH0255566A (ja) * | 1988-08-19 | 1990-02-23 | Canon Electron Inc | パルスモータ |
JPH0578187U (ja) * | 1992-03-23 | 1993-10-22 | 矢崎総業株式会社 | ステッピングモータ |
JPH1094237A (ja) * | 1996-09-13 | 1998-04-10 | Denso Corp | ステップモータ及びその製造方法 |
JP2002238226A (ja) * | 2001-02-09 | 2002-08-23 | Mabuchi Motor Co Ltd | 小型モータ |
-
2004
- 2004-08-25 WO PCT/JP2004/012202 patent/WO2005022727A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6447571U (ja) * | 1987-09-17 | 1989-03-23 | ||
JPH0255566A (ja) * | 1988-08-19 | 1990-02-23 | Canon Electron Inc | パルスモータ |
JPH0578187U (ja) * | 1992-03-23 | 1993-10-22 | 矢崎総業株式会社 | ステッピングモータ |
JPH1094237A (ja) * | 1996-09-13 | 1998-04-10 | Denso Corp | ステップモータ及びその製造方法 |
JP2002238226A (ja) * | 2001-02-09 | 2002-08-23 | Mabuchi Motor Co Ltd | 小型モータ |
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