WO2013125593A1 - Moteur à courant continu, dispositif d'attaque d'élément optique et appareil de recueil d'image - Google Patents

Moteur à courant continu, dispositif d'attaque d'élément optique et appareil de recueil d'image Download PDF

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Publication number
WO2013125593A1
WO2013125593A1 PCT/JP2013/054214 JP2013054214W WO2013125593A1 WO 2013125593 A1 WO2013125593 A1 WO 2013125593A1 JP 2013054214 W JP2013054214 W JP 2013054214W WO 2013125593 A1 WO2013125593 A1 WO 2013125593A1
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WO
WIPO (PCT)
Prior art keywords
rotor
motor
brushless
coil winding
iron core
Prior art date
Application number
PCT/JP2013/054214
Other languages
English (en)
Japanese (ja)
Inventor
直人 志賀
冬彦 島村
徹 大坪
Original Assignee
株式会社タムロン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2013015745A external-priority patent/JP2013201884A/ja
Priority claimed from JP2013015786A external-priority patent/JP2013201885A/ja
Priority claimed from JP2013015817A external-priority patent/JP2013201886A/ja
Application filed by 株式会社タムロン filed Critical 株式会社タムロン
Publication of WO2013125593A1 publication Critical patent/WO2013125593A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer

Definitions

  • the present invention relates to a direct current motor, in particular, a brushless direct current motor, and an optical element driving device and an imaging device provided with the brushless direct current motor.
  • the present invention relates to a small DC motor that can achieve higher output even if it has the same dimensions as conventional ones.
  • a small DC motor with a brush is used as a driving source of a lens moving mechanism for moving the lens position of an imaging lens group.
  • a small brushed DC motor has a large starting torque and is excellent in acceleration and speed controllability, and is therefore suitable as a driving source for a lens moving mechanism that requires precise control of the lens position.
  • Small DC motors with brushes are classified into an inner rotor type and an outer rotor type depending on the arrangement of the rotor and the stator.
  • the winding region of the coil is disposed around the outer periphery or inner periphery of the rotor.
  • the outer diameter of the motor is also increased. Therefore, when the installation space is limited, there is a limit to improving the motor torque.
  • an inner-rotor type three-phase brushless DC motor disclosed in Patent Document 1 includes a rotor having a plurality of magnetic poles in the outer circumferential portion and a stator that is spaced apart along the outer circumferential side surface of the rotor.
  • the structure provided with (stator) is employ
  • a DC motor with a brush rotates a rotor by mechanically changing the polarity that flows through the coil winding using a commutator and a brush.
  • the brushless DC motor removes the commutator and the brush from the DC motor, and instead uses a magnetic sensor such as a Hall element to detect the rotational position (magnetic pole) of the rotor, and based on this detection signal The polarity of the drive current applied to the coil winding is changed. Since the brushless DC motor does not have mechanical contact parts such as a brush and a commutator, it has a characteristic that mechanical noise is not generated and the mechanical life is long.
  • Brushless DC motors generally have a three-phase configuration, and a magnetic sensor is provided for each phase. Three magnetic sensors provided for each phase are connected in series or in parallel to the power supply. In addition, each magnetic sensor and the motor drive circuit are connected by two signal lines, and the motor drive circuit detects the rotational position of the rotor by a combination of high and low signal levels output from each signal line. One end of the coil winding body is subjected to connection processing such as Y-connection, and the other end of the coil winding body is connected to the motor drive circuit. The motor drive circuit gives a drive signal (drive current) to a predetermined coil winding body according to a predetermined energization pattern according to the rotational position of the rotor. These wirings are usually connected to a wiring pattern of a flexible printed circuit board, and are connected to an external motor drive circuit or the like via the flexible printed circuit board.
  • the three-phase brushless DC motor disclosed in Patent Document 1 employs a configuration in which stators are arranged on both sides across a rotor having an installation dimension, compared to the case where a circular stator is employed.
  • stators are arranged on both sides across a rotor having an installation dimension, compared to the case where a circular stator is employed.
  • it is necessary to assemble the rotor and the stator separately, and there is a problem that the assembling work of the motor becomes complicated.
  • the rotor and stator coil winding regions are arranged vertically in the rotation axis direction, and the coil winding is wound around the iron core parallel to the rotor rotation axis. It is conceivable to increase the rotor diameter and secure a large coil winding area without increasing the outer diameter of the motor, but the coil around the iron core standing in a small space In the case of winding the coil winding, it is very difficult to wind the coil winding because the gap between adjacent iron cores is small.
  • a brushless DC motor equipped with a magnetic sensor can control the rotor speed with high accuracy and can maintain a stable rotation of the rotor at a low speed, but does not have a magnetic sensor.
  • a direct current motor or the like there is a problem that the number of wires increases because wires for connecting to the magnetic sensor are required.
  • the wiring for connecting to the coil winding body needs to ensure a thickness of a certain level or more in order to ensure the reliability of the operation. For this reason, in the brushless DC motor, the wiring area of the flexible printed circuit board is larger than that of the sensorless type motor, which has been one of the factors hindering the miniaturization of the brushless DC motor.
  • an object of the present invention is to provide a small brushless DC motor that is easy to assemble a motor and that can achieve higher output than before without increasing the outer diameter of the motor. It is in.
  • an object of the present invention is to provide a direct current motor that can easily wind a winding even when a plurality of iron cores are provided in a narrow space while achieving high torque.
  • an object of the present invention is to provide a brushless DC motor that can secure a wiring area of a flexible printed circuit board and can be reduced in size as compared with the conventional one.
  • an object of the present invention is to provide an optical element driving apparatus and an imaging apparatus provided with these DC motors.
  • the brushless DC motor includes a rotor having a plurality of magnetic poles in the circumferential direction, an annular portion having a surface perpendicular to the rotation axis direction of the rotor, and an outer circumferential portion of the annular portion. And a stator having a plurality of projecting iron cores parallel to the rotation shaft, the tip of which extends to the rotor side, and a coil winding body wound around each projecting iron core.
  • the rotor and the coil winding region of the ridge iron core portion are arranged vertically in the direction of the rotation axis, and the magnetic field lines generated from the coil act on the outer peripheral surface of the rotor via the tip of each ridge iron core portion.
  • the number of the protrusion cores is 3 ⁇ m (where m is an integer of 2 or more), and the number of magnetic poles provided on the outer peripheral surface of the rotor is 2 ⁇ n (where n is It is preferably a three-phase brushless DC motor in which the least common multiple of the number of protrusion cores and the number of magnetic poles is 24 or more.
  • the stator uses a flat plate member in which the protruding cores are radially provided on the outer periphery of the annular part, and the protruding core is attached to the annular part. It is preferably formed by bending substantially vertically.
  • the winding of the coil is wound around each protruding iron core in a state where the protruding iron core is radially provided on the outer periphery of the annular portion, Then, it is preferable that the said protruding iron core part is bend
  • the DC motor according to the present invention includes a rotor having a plurality of magnetic poles in the circumferential direction on the outer peripheral portion, an annular portion having a surface perpendicular to the rotation axis direction of the rotor, and an outer periphery of the annular portion.
  • a stator having a plurality of protruding cores parallel to the rotation axis of the rotor, each of the protruding cores being inserted,
  • a coil winding member having a plurality of bobbin portions around which windings are wound and a ring-shaped connecting portion that radially connects the bobbin portions, and in each coil winding member, a coil is provided for each bobbin portion.
  • Each bobbin core is wound by bending the bobbin part around which the coil winding is wound substantially perpendicularly to the connecting part, and inserting each rib core part into each bobbin part.
  • the coil winding body is provided around the part. That.
  • the bobbin portion and the connecting portion are integrally formed of an insulating resin.
  • the rotor and the coil winding region of the ridge iron core portion are arranged vertically in the rotation axis direction of the rotor.
  • the brushless DC motor according to the present invention includes a rotor having a plurality of magnetic poles in the circumferential direction on the outer peripheral portion, an annular portion having a surface perpendicular to the rotation axis direction of the rotor, and the annular portion.
  • tip part of the said protrusion iron core part is provided, It is characterized by the above-mentioned.
  • the position detection sensor is mounted on the outside of the wiring portion of the flexible printed circuit board, and is disposed in a gap between the tip portions of the protruding iron core portions adjacent to each other. Is preferred.
  • the position detection sensor includes a position detection unit and a terminal connected to the wiring, and the flexible printed board has an insertion port into which the position detection unit side is inserted, It is preferable to provide a connection pattern to which the terminal is connected when the position detection unit is inserted into the insertion port.
  • the optical element driving apparatus is characterized by including the brushless DC motor or the DC motor described above as a driving source for moving the optical element in the optical axis direction.
  • the imaging device according to the present invention is characterized in that the lens for imaging is moved in the optical axis direction using the optical element driving device described above.
  • the rotor and the coil winding region of the stator are arranged vertically in the direction of the rotation axis of the rotor, a large coil winding region can be secured even when the rotor diameter is increased. Therefore, it is possible to increase the output of the brushless DC motor as compared with the conventional one without increasing the outer diameter and the reduction ratio of the motor. Therefore, it can be suitably used as a drive source for various small electronic devices in which various components are mounted in a narrow space with high density.
  • a coil winding member in which the bobbin part is foldably connected to the connecting part is used to wind the winding around each bobbin part in advance. After that, the bobbin portion is bent and attached to each protruding iron core portion, so that the coil can be easily wound.
  • the brushless DC motor of the present invention has a position detection sensor, the number of wirings is larger than that of a sensorless type motor, but in the present invention, the wiring area of the flexible printed circuit board can be ensured. In comparison, the brushless DC motor can be reduced in size.
  • FIG. 1 is an external perspective view showing an example of a brushless DC motor according to the present invention (first embodiment). It is sectional drawing which shows an example of the brushless DC motor which concerns on this invention (1st Embodiment). It is a top view which shows the magnetic pole of a rotor.
  • FIG. 4A is a plan view showing an example of a stator portion of a brushless DC motor according to the present invention, and FIG. It is a top view which shows the phase structure of a coil winding body (1st Embodiment). It is a top view which shows the other example of arrangement
  • FIG. 1 shows an external perspective view of a brushless DC motor 100 according to the present invention.
  • 2 is a cross-sectional view of the brushless DC motor 100
  • FIG. 3 is a plan view showing the arrangement of the magnetic poles 13 (S, N) of the rotor 10.
  • FIG. 4 is a plan view (a) and a sectional view (b) of the stator 20 (excluding the coil winding body 24) of the brushless DC motor 100
  • FIG. It is a top view which shows an example.
  • the brushless DC motor 100 is a so-called iron core type motor in which a coil winding is wound around an iron core (the protruding iron core portion 23). As shown in FIG. 1, the coil winding of the rotor 10 and the stator 20 is performed.
  • the line region 21 is arranged above and below in the rotation axis direction of the rotor 10 (the axial direction of the rotation shaft 11). When the motor is viewed in plan, the coil winding region 21 is not disposed on the same plane around the outer periphery or inner periphery of the rotor 10 as in the prior art, but instead of the rotor 10 and the coil winding region 21.
  • the outer diameter of the rotor 10 can be increased and the coil winding region 21 can be secured large.
  • a high torque can be achieved with the same dimensions.
  • a flexible printed circuit board 30 having various wirings is wound above the coil winding region 21 of the iron core (the ridge iron core portion 23) so as to surround the outside of the ridge iron core portion 23.
  • An example is shown.
  • specific configurations of the rotor 10 and the stator 20 will be described.
  • the rotor 10 is a magnet (permanent magnet) rotor having a plurality of magnetic poles 13 (S, N) in the circumferential direction on the outer peripheral portion 12 thereof.
  • the rotor 10 includes a rotating shaft (shaft) 11, and the rotating shaft 11 is rotatably supported by the bracket 40 via bearings 14 and 15.
  • the magnetic pole 13 is equally divided into eight poles in the circumferential direction, and the magnetic poles 13 are arranged so that the S pole and the N pole alternately appear in the circumferential direction on the outer peripheral surface.
  • the stator 20 includes an annular portion 22 having a surface perpendicular to the rotation axis direction of the rotor 10, and the rotation shaft 11 having a tip portion 23 a extending to the rotor 10 side. And a coil winding body 24 wound around each of the rib core parts 23. Further, the center of the annular portion 22 is opened, and the rotating shaft 11 of the rotor 10 is inserted into the opening 22 a via the bracket 40 and the bearing 15.
  • the annular portion 22 and the protruding iron core portion 23 can be integrally formed using a ferromagnetic material. Specifically, by using a flat plate-like member in which the protruding core portion 23 is radially connected to the outer peripheral portion of the annular portion 22, the protruding core portion 23 is bent substantially perpendicularly to the annular portion 22. 2 and FIG. 3 can be used as the iron core structure.
  • the protruding iron core portions 23 are provided at equal intervals on the outer peripheral portion of the annular portion 22. In the example of illustration, the example provided with nine protrusion iron core parts 23 is shown. The relationship between the number of magnetic poles 13 provided on the outer peripheral portion 12 of the rotor 10 and the number of the protruding iron core portions 23 (number of slots) will be described later.
  • each protruding iron core portion 23 is a coil winding region 21, and the tip end portion 23 a of each protruding iron core portion 23 extends to the rotor 10 side.
  • the rotor 10 is disposed opposite to the outer peripheral surface.
  • the coil winding body 24 When the coil winding body 24 is energized, the magnetic lines of force (magnetic field) generated from the coil winding body 24 are converged on the ridge iron core portion 23 which is a ferromagnetic body, and the ridge iron core portion 23 is connected via the tip 23a. It acts on the outer peripheral surface of the rotor 10.
  • the length of each protruding iron core portion 23 in the rotation axis direction is longer than the sum of the length of the rotor 10 in the rotation axis direction and the length of the coil winding region 21 in the rotation axis direction.
  • the tip of the ridge iron core portion 23 protrudes from the upper end of the rotor 10.
  • an insulating paint is applied to the ridge iron core portion 23 so that the ridge iron core portion 23 and the coil winding body 24 are insulated.
  • the method of winding the coil around the ridge iron core portion 23 is not particularly limited, and a general winding technique of the brushless DC motor 100 is adopted. can do.
  • the present invention is applied to a motor having a small diameter, and the gap between the adjacent protrusion core portions 23 is also small. Therefore, for example, when using a flat plate member in which the protruding core portions 23 are provided radially on the outer peripheral portion of the annular portion 22 as described above, before the protruding protruding core portions 23 are bent, the protruding core portions are bent. It is possible to employ a method in which a coil winding is wound around 23 and then the protruding iron core portion 23 is bent.
  • a method in which the coil winding body 24 is formed in advance and the coil winding body 24 is attached to the protruding iron core portion 23 may be employed.
  • the gap between the adjacent ridge iron core portions 23 is small, and the winding of the coil is wound around each ridge iron core portion 23. Even if it is difficult, the winding of the coil can be easily wound around each protruding iron core portion 23 using a known method or the like.
  • a position detection sensor 50 such as a Hall element is disposed in the gap between the rib core portions 23.
  • the brushless DC motor 100 is provided on the outer peripheral surface of the rotor 10 in which the number of the protruding iron core portions 23 (hereinafter referred to as “the number of slots”) is 3 ⁇ m (where m is an integer of 2 or more).
  • the number of magnetic poles is preferably 2 ⁇ n (where n is an integer of 4 or more), and the least common multiple of the number of slots and the number of magnetic poles is preferably a three-phase brushless DC motor.
  • the brushless DC motor 100 When the brushless DC motor 100 is used as a fan motor or the like, a two-phase or four-phase configuration may be adopted. However, the brushless DC motor 100 is used as various driving sources such as a small electronic device. It is preferable to have a three-phase structure. Therefore, it is preferable that the number of slots is a number represented by a multiple of 3 so that the number of slots is also represented by 3 m.
  • the static torque decreases as the least common multiple of the number of slots and the number of magnetic poles increases.
  • a combination of 9 slots and 12 magnetic poles, or a combination of 6 slots and 8 magnetic poles is adopted. 36, 24.
  • the least common multiple is 72.
  • the value of the least common multiple of the number of slots and the number of magnetic poles is doubled and tripled as compared with the iron core type brushless DC motor 100 of the conventional configuration, and the static torque Can be reduced to 1/2 and 1/3 compared to the conventional configuration.
  • the combination of the number of slots and the number of magnetic poles is not limited to the illustrated example.
  • the number of slots may be 9 and the number of magnetic poles may be 16.
  • the least common multiple of the number of slots and the number of magnetic poles is 144, and the static torque can be further reduced.
  • the combination is such that the least common multiple of the number of slots and the number of magnetic poles is higher than the conventional one.
  • the brushless DC motor according to the present invention Of course, as in the conventional case, a combination of 9 slots and 12 magnetic poles or a combination of 6 slots and 8 magnetic poles may be adopted for 100.
  • the phase configuration is three phases (U phase, V phase, W phase), and u ⁇ , u + , u ⁇ , v ⁇ , v + , v ⁇ , w ⁇ , w + , As shown by w ⁇ , three in-phase coil winding bodies 24 are arranged adjacent to each other. However, in each phase, the winding direction of the coil winding body 24 disposed in the center and the winding direction of the coil winding body 24 disposed on both sides thereof are reversed.
  • the generated torque in each phase is the coil winding body 24u + (v + , w + ) disposed in the center of the phase and the coil windings disposed on both sides thereof. Since there is a deviation of ⁇ 20 ° in electrical angle ( ⁇ 5 ° in mechanical angle) with the body 24u ⁇ (v ⁇ , w ⁇ ), the torque generated in each phase becomes flat and torque ripple can be reduced. it can.
  • a general iron core type motor coil windings adjacent to each other in the order of the U-phase coil winding body 24, the V-phase coil winding body 24, the W-phase coil winding body 24, and the like.
  • the wire bodies 24 are arranged so as to be in different phases. For this reason, the torque generated in each phase is in-phase, and torque ripple is increased.
  • the in-phase coil winding bodies 24 are arranged adjacent to each other, but as shown in FIG.
  • the coil winding bodies 24 of each phase of the U phase, the V phase, and the W phase may be arranged in order, and the coils of the same phase may be arranged equally.
  • FIG. 7 shows a schematic perspective view of a DC motor 200 as the second embodiment.
  • 8 is a cross-sectional view of the DC motor 200
  • FIG. 9 is a plan view (a) showing a coil winding member for winding a coil winding body and a state where the bobbin portion is bent.
  • FIG. 10 is a side view (b) shown
  • FIG. 10 is a plan view showing the arrangement of the coil winding body 24.
  • the DC motor 200 according to the present invention is characterized by the arrangement of the rotor 10 and the coil winding region 21 and the coil winding method. Below, after demonstrating the structure of the DC motor 200 which concerns on this invention, the winding method of a coil is demonstrated.
  • the DC motor 200 according to the second embodiment is an iron core type brushless DC motor in which a coil winding 24a (see FIGS. 10 and 11) is wound around an iron core.
  • a coil winding 24a see FIGS. 10 and 11
  • FIG. 7 the rotor 10 and the coil winding region 21 of the stator 20 are arranged in the direction of the rotation axis of the rotor 10 (the rotation axis 11 of the rotor 10. It is characterized in that it is arranged in the vertical direction.
  • a flexible printed circuit board 30 having various wirings is wound above the coil winding region 21 of the iron core (the ridge iron core portion 23) so as to surround the outside of the ridge iron core portion 23. An example is shown.
  • the outer diameter of the rotor 10 can be increased and the coil winding region 21 can be secured large.
  • a high torque can be achieved with the same dimensions.
  • the rotor 10 is a magnet (permanent magnet) rotor having a plurality of magnetic poles 13 (S, N) in the circumferential direction.
  • the rotor 10 includes a rotating shaft 11 (shaft), and the rotating shaft 11 is rotatably supported by the bracket 40 via bearings 14 and 15.
  • the second embodiment has a magnetic pole 13 equally divided into eight poles in the circumferential direction, as shown in FIG. 3, and the S pole and the N pole are circumferential in the outer circumferential surface.
  • the magnetic poles 13 are arranged so as to appear alternately.
  • the stator 20 includes an annular portion 22 having a surface perpendicular to the rotation axis direction of the rotor 10 and its tip.
  • the center of the annular portion 22 is opened, and the rotating shaft 11 of the rotor 10 is inserted into the opening 22 a via the bracket 40 and the bearing 15.
  • the annular portion 22 and the protruding iron core portion 23 can be integrally formed using a ferromagnetic material.
  • a ferromagnetic material For example, by using a flat plate-like member in which the ridge iron core portion 23 is radially provided on the outer peripheral portion of the annular portion 22, the ridge iron core portion 23 is bent substantially perpendicularly to the annular portion 22. 4 and the iron core structure shown in FIG.
  • the protruding iron core portions 23 are provided at equal intervals on the outer peripheral portion of the annular portion 22. In the example of illustration, the example provided with nine protrusion iron core parts 23 is shown.
  • each protruding iron core portion 23 is erected on the annular portion 22 substantially in parallel with the rotating shaft 11 of the rotor 10.
  • the annular portion 22 side of each protruding iron core portion 23 is a coil winding region 21, and the tip end portion 23 a of each protruding iron core portion 23 extends to the rotor 10 side, and is disposed opposite to the outer peripheral surface of the rotor 10.
  • the coil winding body 24 When the coil winding body 24 is energized, the lines of magnetic force (magnetic field) generated from the coil winding body 24 converge on the ridge iron core portion 23 which is a ferromagnetic body, and through the tip end portion 23a of the ridge iron core portion 23.
  • each protruding iron core portion 23 in the rotation axis direction is longer than the sum of the length of the rotor 10 in the rotation axis direction and the length of the coil winding region 21 in the rotation axis direction.
  • the tip of the ridge iron core portion 23 protrudes from the upper end of the rotor 10.
  • a coil winding body 24 is provided on the protruding iron core portion 23 via a bobbin portion 51.
  • the bobbin part 51 is mutually connected by the connection part 52 which has a ring shape.
  • the bobbin portion 51 and the connecting portion 52 are integrally formed of an insulating resin or the like, and the bobbin portion 51 is connected to the connecting portion 52 so as to be bent as will be described later.
  • the coil winding member 53 having the bobbin portion 51 and the connecting portion 52 and the coil winding method will be described later.
  • a position detection sensor 80 such as a Hall element is disposed in the gap between the ridge cores 23.
  • the position (rotational position) of the magnetic pole 13 of the rotor 10 can be detected at a position closer to the rotor 10 by inserting the position detection sensor 80 into the gap between the tip portions of the protruding core portions 23.
  • the direct current motor 200 arranges the rotor 10 and the coil winding region 21 of the stator 20 vertically in the rotation axis direction without increasing the outer diameter of the motor.
  • the diameter of the rotor 10 is enlarged, and a large coil winding area 21 is ensured, thereby increasing the torque of the motor.
  • the DC motor 200 is a motor having a small diameter such as an outer diameter of about 10 mm, a plurality of the protruding core parts 23 are provided in a narrow space, and therefore the adjacent protruding core parts are adjacent to each other. The gap between 23 is reduced.
  • the coil winding member 53 shown in FIGS. 9A and 9B is used to wind and connect the coil winding 24a, and then each coil winding body 24 is connected to each protruding core. The method of attaching to the part 23 was adopted.
  • the coil winding member 53 shown in FIG. 9A is a member in which a plurality of bobbin portions 51 are radially connected by a connecting portion 52, and these are integrally formed with an insulating resin or the like.
  • the bobbin portion 51 is connected to the connecting portion 52 so as to be bent.
  • each bobbin portion 51 is erected substantially perpendicularly to the connecting portion 52 as shown in FIG.
  • each bobbin part 51 is formed in the hollow shape, and each protrusion iron core part 23 can be inserted in this hollow part.
  • FIG. 9A in a state before each bobbin portion 51 is bent with respect to the connecting portion 52, a coil winding 24a is wound around each bobbin portion 51 as shown in FIG. A coil winding body 24 is formed. At this time, after the coil winding 24a is wound around each bobbin portion 51 so as to have a predetermined phase configuration and phase arrangement, a connection process is performed. Then, as shown in FIG. 11, the bobbin portion 51 around which the coil winding 24 a is wound is bent at a substantially right angle with respect to the connecting portion 52.
  • each bobbin portion 51 is bent, the protruding iron core portion 23 is inserted into the hollow portion of each bobbin portion 51, and the connecting portion 52 is brought into contact with the annular portion 22 of the stator 20. Thereafter, heat treatment or the like is performed, and each bobbin portion 51 is thermally contracted to be fixed to each protruding core portion 23. Thereby, the coil winding body 24 is provided in each protruding iron core part 23.
  • the coil winding member 53 in the iron core type motor, even when a plurality of iron cores (projection iron core portions 23) are provided in a narrow space, the winding is wound around each iron core. It can be easily wound. For this reason, the space
  • the DC motor 200 of the second embodiment described above is an aspect of the present invention, and it is needless to say that the DC motor 200 can be appropriately changed without departing from the gist of the present invention.
  • a small brushless DC motor has been mainly described as an example.
  • the present invention is not limited to a brushless DC motor but may be applied to a normal DC motor including a commutator and the like.
  • the number of protrusion core portions 23 (slots) and the number of magnetic poles of the rotor 10 may be appropriately changed.
  • FIG. 12 shows a schematic perspective view of a brushless DC motor 300 according to the third embodiment.
  • FIG. 13 is a cross-sectional view of the brushless DC motor 300.
  • FIG. 14 is a plan view showing the arrangement of the coil winding body 24.
  • the brushless DC motor 300 according to the third embodiment of the present invention is a so-called iron core in which a coil winding is wound around an iron core (a projecting iron core portion 23 described later) as shown in FIGS. 12, 13, and 14.
  • Type motor In the brushless DC motor 300 according to the present embodiment, as shown in FIGS. 12 and 13, the rotor 10 and the coil winding region 21 of the stator 20 (region where the coil winding body 24 is disposed) are connected to the rotor 10. In the direction of the rotation axis (the axial direction of the rotation shaft 11 of the rotor 10). Also, as shown in FIG. 12, above the coil winding region 21 (the side on which the rotor 10 is arranged in the direction of the rotation axis shown in FIG.
  • FIG. 12 shows a state where the brushless DC motor 300 is attached to an attachment member (annular flat plate) 41 via the bracket 40.
  • an attachment member annular flat plate
  • the rotor 10 is a magnet (permanent magnet) rotor having a plurality of magnetic poles 13 (S, N) in the circumferential direction on the outer peripheral portion 12 thereof.
  • the rotor 10 includes a rotating shaft 11 (shaft), and the rotating shaft 11 is rotatably supported by the bracket 40 via bearings 14 and 15.
  • the third embodiment has a magnetic pole 13 equally divided into eight poles in the circumferential direction as shown in FIG. 3, and the S pole and the N pole are circumferential in the outer circumferential surface.
  • the magnetic poles 13 are arranged so as to appear alternately.
  • the number of magnetic poles 13 is not particularly limited and may be 2 ⁇ n (where n is an integer of 1 or more).
  • the stator 20 includes an annular portion 22 having a surface perpendicular to the rotation axis direction of the rotor 10 and its tip.
  • the part 23 a has a plurality of protruding core parts 23 extending to the rotor 10 side, and a coil winding body 24 wound around each protruding core part 23. Further, the center of the annular portion 22 is opened, and the rotating shaft 11 of the rotor 10 is inserted into the opening 22 a via the bracket 40 and the bearing 15.
  • the annular portion 22 and the protruding iron core portion 23 can be integrally formed using a ferromagnetic material. Specifically, by using a flat plate-like member in which the protruding core portion 23 is radially connected to the outer peripheral portion of the annular portion 22, the protruding core portion 23 is bent substantially perpendicularly to the annular portion 22. 4 and FIG. 13 can be used as the iron core structure.
  • the protruding iron core portion 23 is provided on the outer peripheral portion of the annular portion 22 at equal intervals.
  • the number of the protrusion core parts 23 is not particularly limited, since the brushless DC motor 300 is normally three-phase driven, the number (number of slots) of the protrusion core parts 23 is 3 ⁇ m (where m is 1 or more). An integer) is preferable. In the example of illustration, the example provided with nine protrusion iron core parts 23 is shown.
  • each protrusion core part 23 is provided substantially in parallel with the rotating shaft 11 of the rotor 10.
  • the side on which the rotor 10 is disposed is the upper side
  • the side on which the annular portion 22 is disposed is the lower side, as described above, the protruding iron core portion 23.
  • the winding of the coil is wound from the substantially central position to the lower side (base end portion 23b side).
  • the upper side (the side of the distal end portion 23 a) from the substantially central position of the protruding iron core portion 23 is disposed to face the outer peripheral surface of the rotor 10.
  • the lines of magnetic force (magnetic field) generated from the coil winding body 24 converge on the ridge iron core portion 23 which is a ferromagnetic body, and through the tip end portion 23a of the ridge iron core portion 23. It acts on the outer peripheral surface of the rotor 10.
  • the length of each protruding iron core portion 23 in the rotation axis direction is longer than the sum of the length of the rotor 10 in the rotation axis direction and the length of the coil winding region 21 in the rotation axis direction.
  • the tip of the ridge iron core portion 23 protrudes from the upper end of the rotor 10.
  • the method of winding the coil around the ridge iron core portion 23 is not particularly limited, and a general winding technique of the brushless DC motor 300 can be adopted. Also, there is no particular limitation on the arrangement of the coil winding body 24 for each phase, the method of connection processing, and the like. For example, as shown in FIG. 14, the coil winding bodies 24 of each phase (U phase, V phase, W phase) can be arranged in order. Note that an insulating paint is applied to the ridge iron core portion 23 to insulate the ridge iron core portion 23 from the coil winding body 24.
  • a position detection sensor 91 for detecting the rotational position of the rotor 10 is disposed in the gap between the rib core portions 23 at the tip end portion 23 a of each rib core portion 23. .
  • the position detection sensor 91 By disposing the position detection sensor 91 in the gap between the protrusion core parts 23, the magnetic pole position of the rotor 10 can be detected at a position closer to the rotor 10. Further, the position detection sensor 91 is provided for each phase (U phase, V phase, W phase). As a result, the rotational position of the rotor 10 can be detected with high accuracy.
  • the position detection sensor 91 for example, a Hall element can be used.
  • the Hall element is an element that generates a DC voltage with respect to the magnetic flux.
  • the Hall element includes a pair of signal terminals and a pair of power supply terminals, which are connected to wiring patterns provided on the flexible printed circuit board 90, respectively.
  • the rotational position (magnetic pole position) of the rotor 10 can be detected by the change in level of the signal level output from the signal output terminal.
  • FIG. 15 shows a flexible printed circuit board 90 according to the present embodiment.
  • the flexible printed circuit board 90 is provided with various wiring patterns 31 a and 31 b that are electrically connected to the coil winding body 24 and the position detection sensor 91.
  • the wiring area 31 in which these wiring patterns 31a and 31b are arranged, the position detection sensor mounting area 32 in which the position detection sensor 91 is mounted, and the winding of the coil winding body 24 are soldered. It can be roughly divided into a coil connection region 33 provided with a connection pattern 33a to be connected and a connection terminal region 34 provided with connection terminals 34a and 34b for connection to an external motor drive circuit (not shown). .
  • FIGS. 15 and 16 a part of the wiring pattern 31a and the connection terminal 34a are not shown. Hereinafter, each region will be described.
  • the position detection sensor mounting area 32 is provided with a connection pattern 32a for connecting the four terminals (two signal terminals and two power supply terminals) of the position detection sensor 91 described above.
  • Each connection pattern 32 a is connected to a signal line or power line wiring pattern 31 a of the position detection sensor 91 provided in the wiring region 31.
  • the position detection sensor mounting area 32 has an insertion port 32b into which the position detection unit 92 side of the position detection sensor 91 is inserted when the terminal of the position detection sensor 91 is connected to the connection pattern 32a. It is cut out.
  • the insertion port 32b is disposed in the gap between the two adjacent protruding core portions 23. can do.
  • the position detection sensor 91 is inserted into the gap between the adjacent protrusion core parts 23 by inserting the position detection part 92 side of the position detection sensor 91 into the insertion port 32b and connecting each terminal to the connection pattern 32a. Can be arranged.
  • the position detection sensor 91 can be arranged at a predetermined position after the flexible printed board 90 is wound around the protruding iron core portion 23. It is possible to prevent a mechanical load from being applied to the position detection sensor 91 during the winding operation of the printed circuit board 90. Further, by arranging the position detection sensor 91 in the gap between the ridge iron core portions 23, the position detection sensor 91 protrudes outside the ridge iron core portion 23, and the outer diameter of the brushless DC motor 300 is increased. Can be prevented.
  • connection patterns 33a to which the windings of the coil winding bodies 24 are connected are formed.
  • two connection patterns 33a are provided for each coil winding body 24, and one end and the other end of each winding of each coil winding body 24 are connected to a predetermined connection pattern 33a.
  • the connection patterns 33a are connected to each other according to the phase configuration of the coil.
  • the windings of the coil winding bodies 24 are connected to the coil driving wiring pattern 31 b provided in the wiring region 31 through these connection patterns 33 a.
  • the coil driving wiring pattern 31 b has a wider pattern width than the signal output wiring pattern 31 a connected to the position detection sensor 91 in order to ensure the reliability of the operation of the brushless DC motor 300. .
  • linear wiring patterns 31 a and 31 b are arranged substantially in parallel, and one end of these wiring patterns 31 a and 31 b is connected to the connection terminals 34 a and 34 b in the connection terminal region 34.
  • Curved wiring patterns 31a and 31b for connecting the wiring region 311 and the connection patterns 32a and 33b provided in the position detection sensor mounting region 32 and the coil connection region 33 with the linear wiring patterns 31a and 31b.
  • a second wiring region 312 (wiring portion) provided with.
  • the first wiring region 311 and the second wiring region 312 are arranged side by side in a direction orthogonal to the rotation axis direction, and in the illustrated example, the first wiring region 311 is on the left side and the second wiring region A region 312 is arranged on the right side.
  • the position detection sensor mounting region 32 is disposed above the second wiring region 312 in the rotation axis direction (in the illustrated example, above the straight line X), and below the second wiring region 312 in the rotation axis direction (see FIG.
  • the coil connection region 33 is disposed on the lower side of the straight line Z in the illustrated example.
  • the second wiring area 312 includes linear wiring patterns 31 a and 31 b provided in the first wiring area 311, a position detection sensor mounting area 32, and a coil connection area 33.
  • the wiring patterns 31a and 31b provided in the region 312 are curved.
  • the second wiring region 312 has the wiring patterns 31a and 31b arranged in parallel to the first wiring region 311 in which the linear wiring patterns 31a and 31b can be arranged in parallel at a predetermined interval. Since an area for arrangement is required, the length in the direction of the rotation axis is increased.
  • the portion where the second wiring region 312 protrudes from the upper end of the first wiring region 311 and the boundary portion between the position detection sensor mounting region 32 and the second wiring region 312. are folded in a mountain or valley along a straight line (in the example shown, straight lines X and Y) perpendicular to the rotation axis direction, and the flexible printed circuit board 90 is folded as shown in FIG.
  • the wiring portion (second wiring region 312) whose length in the rotation axis direction is long in order to secure the wiring area is folded at least once along a straight line orthogonal to the rotation axis direction.
  • the flexible printed circuit board 90 can be reduced in size by shortening the length of the printed circuit board 90 in the rotation axis direction.
  • the flexible printed circuit board 90 is wound around the outer side of the protruding core part 23 by disposing the insertion port 32 b of the position detection sensor 91 outside the folded portion of the flexible printed circuit board 90. After that, the insertion operation and the terminal connection operation of the position detection sensor 91 can be easily performed.
  • the wiring patterns 31a and 31b are not shown for the folded portion of the flexible printed circuit board 90.
  • the brushless DC motors 100, 200, and 300 of the embodiments described above are one aspect of the present invention, and it is needless to say that the brushless DC motors 100, 200, and 300 can be appropriately changed without departing from the gist of the present invention.
  • the description has been mainly given of the small brushless DC motors 100, 200, and 300 as an example.
  • the outer diameter of the motor is not particularly limited, and may be applied to a large brushless DC motor. It is.
  • FIG. 17 is a schematic cross-sectional view of the optical element driving device 60 according to the present invention.
  • the optical element driving device 60 in the present embodiment uses the brushless DC motor 100 described above as a driving source.
  • the rotational force from the rotating shaft 11 of the brushless DC motor 100 is used to move a lens (optical element) 63 such as an imaging focus lens accommodated and held in the lens barrel 62 via the lens holding frame 61 in the optical axis direction. (Indicated by a dashed line L in FIG. 17).
  • the optical element driving device 60 includes a fixed cylinder 65, a cam cylinder 66 that is inserted through the outer periphery of the fixed cylinder 65, and a speed reduction mechanism 71 that transmits the rotational force of the brushless DC motor 100 to the cam cylinder 66.
  • the speed reduction mechanism 71 includes a gear 72 provided on the rotation shaft 11 of the brushless DC motor 100 described above, and transmission gears 73 and 74 that mesh with the gear 72 and rotate the cam cylinder 66 around the optical axis. It is.
  • the reduction mechanism 71 constitutes a motor unit 70 together with the brushless DC motor 100 described above.
  • a lens 63 held by the lens holding frame 61 is engaged with the cam barrel 66 via cam pins 67 and 68.
  • the driving force transmitted to the rotating shaft 11 of the brushless DC motor 100 is transmitted to the gear 72 and the transmission gears 73 and 74, and the lens holding frame 61 is moved. It can be moved in the optical axis direction.
  • the brushless DC motor 100, 200, or 300 according to the present invention is a variety of small electronic devices in which various components are mounted in a narrow space with high density, such as an imaging device including the optical element driving device 60 described above. It can be suitably used as a drive source.
  • the brushless DC motor 100, 200 or 300 according to the present invention is effective when a structure having a diameter of 10 mm or less is employed. That is, the brushless DC motor 100, 200 or 300 according to the present invention has an annular flat plate 41 as shown in FIG. 1, FIG. 7 or FIG. 12 as compared with the conventional inner rotor type or outer rotor type.
  • the diameter of the rotor 10 can be increased as compared with the conventional one even if the outer dimensions are the same 10 mm or less, and the coil winding region 21 can be secured large. Therefore, it is possible to exert a torque about 2 to 5 times that of the conventional case. Therefore, the brushless DC motors 100, 200 and 300 according to the present invention capable of exhibiting high torque even when the diameter is 10 mm or less are arranged in a narrow space such as the lens barrel 62 as described above. By adopting it in equipment that requires power, it can bring greater benefits.
  • the brushless DC motors 100, 200, and 300 have a higher torque than the conventional one, and therefore the reduction ratio can be reduced. . Therefore, when the brushless DC motor 100, 200 or 300 according to the present invention is used as the drive source of the optical element drive device 60 of the imaging device as described above, the noise during driving and the improvement of the stopping accuracy are to be achieved. Therefore, it is possible to quickly move the lens with high accuracy without generating noise when performing focusing or zooming.
  • the position detection sensor is provided, and the number of wirings is larger than that of the sensorless type motor.
  • the brushless DC motor can be reduced in size.
  • optical element driving device 60 and the imaging device of the present embodiment described above are one aspect of the present invention, and of course can be appropriately changed without departing from the gist of the present invention.
  • the rotor and the coil winding region of the stator are arranged vertically in the rotation axis direction of the rotor.
  • a large area can be secured, and the output of the brushless DC motor can be increased as compared with the conventional one without increasing the outer diameter and the reduction ratio of the motor. Therefore, it can be suitably used as a drive source for various small electronic devices in which various components are mounted in a narrow space with high density.
  • the brushless DC motor since the brushless DC motor has a position detection sensor, the number of wires is larger than that of a sensorless type motor.
  • the wiring area of the flexible printed circuit board can be secured, compared to the conventional case.
  • the brushless DC motor can be reduced in size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'un moteur à courant continu compact, sans balai, dont les travaux de montage soient facilités, et qui assure une production supérieure à ce qui existe dans l'état de la technique, sans augmenter le diamètre extérieur du moteur, d'un dispositif d'attaque d'élément optique prévu avec le moteur à courant continu sans balai, ainsi que d'un appareil de recueil d'image. Pour résoudre ce problème, l'invention propose un moteur sans balai à courant continu, caractérisé en ce qu'il est doté : d'un rotor (10) qui comprend, sur sa périphérie extérieure, une pluralité de pôles magnétiques (13) dans la direction circonférentielle ; et d'un stator (20) qui comprend une partie annulaire (22) ayant une surface perpendiculaire à la direction de son axe rotatif, une pluralité de parties (23) de noyau en fer saillantes, prévues pour se tenir à la périphérie extérieure de la partie annulaire (22) et un corps d'enroulement de bobine (24) enroulé autour de chaque partie de noyau en fer saillante (23), et caractérisé en ce que le rotor (10) et une région d'enroulement de bobine (21) sont respectivement disposés sur les côtés supérieur et inférieur dans la direction de l'axe de rotation et une ligne de force magnétique générée depuis une bobine par le biais de l'extrémité avant (23a) de chaque partie de noyau en fer (23) est appliquée à la surface périphérique extérieure du rotor (10).
PCT/JP2013/054214 2012-02-24 2013-02-20 Moteur à courant continu, dispositif d'attaque d'élément optique et appareil de recueil d'image WO2013125593A1 (fr)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP2012-038374 2012-02-24
JP2012038374 2012-02-24
JP2012-038368 2012-02-24
JP2012-038387 2012-02-24
JP2012038387 2012-02-24
JP2012038368 2012-02-24
JP2013-015745 2013-01-30
JP2013015745A JP2013201884A (ja) 2012-02-24 2013-01-30 ブラシレス直流モータ、光学素子駆動装置及び撮像装置
JP2013-015786 2013-01-30
JP2013-015817 2013-01-30
JP2013015786A JP2013201885A (ja) 2012-02-24 2013-01-30 直流モータ、光学素子駆動装置及び撮像装置
JP2013015817A JP2013201886A (ja) 2012-02-24 2013-01-30 ブラシレス直流モータ、光学素子駆動装置及び撮像装置

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WO2013125593A1 true WO2013125593A1 (fr) 2013-08-29

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946112A (fr) * 1972-09-11 1974-05-02
JPH06141500A (ja) * 1992-10-23 1994-05-20 Japan Servo Co Ltd コアレスモータ
JPH08214525A (ja) * 1994-10-28 1996-08-20 Hewlett Packard Co <Hp> 直流モータ内半径方向磁気抵抗力のバランシング
JPH08242572A (ja) * 1995-02-28 1996-09-17 Japan Servo Co Ltd ３相永久磁石式回転電機
JP2002209357A (ja) * 2001-01-12 2002-07-26 Yaskawa Electric Corp ギャップワインディングモータ
JP2004194423A (ja) * 2002-12-11 2004-07-08 Canon Electronics Inc ブラシレスモータ
JP2006271193A (ja) * 2005-02-28 2006-10-05 Shinano Kenshi Co Ltd モータ
JP2008067569A (ja) * 2006-09-11 2008-03-21 Alps Electric Co Ltd コイル用のボビン、ボビンを用いたコイル部材、磁気駆動機構およびコイル部材の製造方法および磁気駆動機構の製造方法
WO2009001601A1 (fr) * 2007-06-25 2008-12-31 Seiko Precision Inc. Actionneur et carcasse de bobine
JP2010288426A (ja) * 2009-06-15 2010-12-24 Tamron Co Ltd 三相直流モータ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946112A (fr) * 1972-09-11 1974-05-02
JPH06141500A (ja) * 1992-10-23 1994-05-20 Japan Servo Co Ltd コアレスモータ
JPH08214525A (ja) * 1994-10-28 1996-08-20 Hewlett Packard Co <Hp> 直流モータ内半径方向磁気抵抗力のバランシング
JPH08242572A (ja) * 1995-02-28 1996-09-17 Japan Servo Co Ltd ３相永久磁石式回転電機
JP2002209357A (ja) * 2001-01-12 2002-07-26 Yaskawa Electric Corp ギャップワインディングモータ
JP2004194423A (ja) * 2002-12-11 2004-07-08 Canon Electronics Inc ブラシレスモータ
JP2006271193A (ja) * 2005-02-28 2006-10-05 Shinano Kenshi Co Ltd モータ
JP2008067569A (ja) * 2006-09-11 2008-03-21 Alps Electric Co Ltd コイル用のボビン、ボビンを用いたコイル部材、磁気駆動機構およびコイル部材の製造方法および磁気駆動機構の製造方法
WO2009001601A1 (fr) * 2007-06-25 2008-12-31 Seiko Precision Inc. Actionneur et carcasse de bobine
JP2010288426A (ja) * 2009-06-15 2010-12-24 Tamron Co Ltd 三相直流モータ

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