JP2006288097A - Electromagnetic actuator and driving unit equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic actuator, which can be downsized with a simple constitution and where the stop position accuracy of a rotor improves, and torque irregularity is reduced, and the dispersion of quality among products is reduced, and a driving unit equipped with it. <P>SOLUTION: First to third stator parts 11a-11c are arranged at regular intervals in the axial direction of a spindle 11d, with their axial directions aligned. A rotor 12 has four magnetic poles with their polarility alternately different in its rotational direction, and its magnetizing face is inclined in the axial direction of the spindle 11d. Hereby, the entire magnetic actuator can be downsized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outer rotor type electromagnetic actuator and a drive device including the same.

As a stepping motor which is a conventional outer rotor type electromagnetic actuator, for example, as shown in Patent Document 1, an outer rotor made of a cylindrical permanent magnet, and a plurality of coil bobbins arranged in an axial direction of a rotating shaft, Some have a plurality of stators that are opposed to the magnetic poles on the inner peripheral surface of the rotor and that are arranged above and below each coil bobbin. Each stator is formed in a disk shape having a large number of comb teeth.
Japanese Patent Laid-Open No. 11-225466

  The stepping motor of Patent Document 1 described above has a problem in that it has two disk-shaped stators per one coil bobbin and becomes large. In addition, since the shape of the stator is comb-like and the bending process is necessary and complicated, and since a large number of stators are separately provided, variation in component accuracy between each stator and incorporation accuracy are reduced. Variations are likely to occur, and as a result, the rotational stop position accuracy of the rotor is reduced, causing torque irregularities and quality variations among the stepping motors.

  The present invention has been made in view of the above circumstances, and is an electromagnetic actuator that is reduced in size, improved in the stop position accuracy of the rotor, reduced in torque unevenness, and reduced in quality variation among products. It aims at providing the drive device provided with.

  In order to achieve the above object, an electromagnetic actuator according to the present invention includes a stator comprising a support shaft and a plurality of rod-shaped members arranged side by side in the axial direction of the support shaft around the support shaft. A coil wound around the spindle between the plurality of rod-shaped members, and a plurality of magnetic poles in the rotation direction, and a magnetized surface of the plurality of magnetic poles is inclined with respect to the axial direction of the spindle The stator is disposed inside such that the plurality of magnetic poles and end portions of the plurality of rod-shaped members are opposed to each other, and includes a rotor that rotates about the support shaft.

  Further, the rotor may be formed by rolling a parallelogram sheet having an outer shape, and the magnetic pole surface may be provided in a direction parallel to the oblique side of the parallelogram sheet.

  Further, the rotor is formed by arranging a plurality of magnetized rectangular members, and the rectangular member magnetized to the same pole in the axial direction of the support shaft by sequentially shifting in the rotational direction. It may be arranged.

  Further, the support shaft and the plurality of rod-shaped members may be integrally formed.

  In order to achieve the above object, a drive device of the present invention includes the above-described electromagnetic actuator, and a yoke for preventing magnetic flux leakage is integrally provided on the outer periphery of the rotor, and the driving force of the rotor is provided on the outer periphery of the yoke. A transmission unit for transmission is provided.

  According to the present invention, an electromagnetic actuator that is downsized with a simple configuration, improves the stop position accuracy of the rotor, reduces torque unevenness, and reduces variations in quality among products, and a drive including the same An apparatus can be provided.

  An electromagnetic actuator according to an embodiment of the present invention will be described below with reference to the drawings. The electromagnetic actuator 10 is a permanent magnet type (PM (Permanent Magnet) type) outer rotor type stepping motor, and rotates the drive target attached to the rotor (or yoke) by rotating the rotor. .

  As shown in FIGS. 1 and 2, the electromagnetic actuator 10 includes a stator 11 including a support shaft 11 d, a rotor 12 that rotates on the outer periphery of the stator 11, a coil 13 wound between the stators 11, and a bearing 14. A shaft support 15 that supports the rotation of the rotor 12, a bearing 16, a yoke 17 that is fixed to the outer periphery of the rotor 12, a terminal 18 that is electrically connected to the coil 13, and an upper lid 19 that fixes the bearing 14 and the yoke 17. And. The terminal 18 is fixed to the bearing 14. In FIG. 2, the bearing 14, the shaft support portion 15, the terminal 18, and the upper lid 19 are omitted for easy understanding.

  The stator 11 is for guiding the magnetic flux of the excited coil 13 to the magnetized region of the rotor 12. The stator 11 includes first to third stator portions (11a to 11c) made of three prismatic rod-shaped members and a support shaft 11d. The stator 11 is made of, for example, a soft magnetic material. The 1st-3rd stator parts 11a-11c are formed by press punching etc. integrally with the spindle 11d. The thickness t (FIG. 1A) of the entire stator 11 is constant at 0.7 mm. The directions of the axes of the three first to third stator portions 11a to 11c are the same, and are arranged side by side so as to be parallel to each other at a constant interval in the axial direction of the support shaft 11d. A support shaft 11d is disposed at the center of the three first to third stator portions 11a to 11c. When the coil 13 is excited, the end portions of the first to third stator portions 11a to 11c facing the inner peripheral surface of the rotor 12 are respectively magnetic poles a (a pole), as shown in FIG. A magnetic pole b (b pole) and a magnetic pole c (c pole) are formed. The magnetic pole a, magnetic pole b, and magnetic pole c are arranged side by side in the axial direction of the support shaft 11d. The support shaft 11d also serves as the central axis of rotation of the rotor 12.

  The rotor 12 is an outer rotor that rotates around the outer periphery of the stator 11 by rotational torque generated by the magnetic force between the rotor 11 and the rotor 11. The rotor 12 is a cylindrical rotating body formed by rolling a sheet having a parallelogram outer shape shown in FIG. 3 into a cylindrical shape. The rotor 12 is made of a magnet material such as rare earth / iron. The rotor 12 has four magnetic poles (N1, N2, S1, S2) having different polarities alternately in the rotation direction, and the magnetized surface is parallel to the hypotenuse 12a of the parallelogram sheet shown in FIG. In the direction. That is, the magnetized surfaces of the four magnetic poles (N1, N2, S1, S2) of the rotor 12 are inclined so as to have a predetermined inclination angle with respect to the axial direction of the support shaft 11d. As shown in FIG. 2, first to third stator portions 11 a to 11 c are arranged in the hollow portion 12 a of the rotor 12, and the first to third magnetic poles (N 1, N 2, S 1, S 2) of the rotor 12 are first to first. It arrange | positions so that the front-end | tip part of the 3rd stator parts 11a-11c may oppose.

The coil 13 magnetizes the stator 11 when excited. The coil 13 is wound directly around the support shaft 11d. Therefore, the electromagnetic actuator 10 of the present embodiment does not include a coil bobbin. The coil 13 includes a first coil 13a wound around a support shaft 11d between the first stator portion 11a and the second stator portion 11b, a second stator portion 11b, and a third stator portion 11c. And the second coil 13b wound around the support shaft 11d. A positive or negative current is applied to the coil 13. The stator 11 is provided with an insulating coating.
Since the two first and second coils 13a and 13b can be wound around the spindle 11d by the same machine at the same time, the number of assembling steps can be reduced and the manufacturing cost can be reduced. Further, since the coil 13 is wound directly on the support shaft 11d instead of the coil bobbin, the winding diameter of the coil 13 can be reduced, so that the electromagnetic actuator 10 can be reduced in the radial direction and the winding space can be reduced. The coil resistance can be kept low, and the efficiency of the coil 13 is improved.

  An upper portion of the support shaft 11d is fixed to the bearing 14 at the center to support the support shaft 11d. The bearing 14 rotatably supports the upper lid 19 and the upper end surfaces of the rotor 12 and the yoke 17. The lower portion of the support shaft 11d is fixed at the center of the shaft support portion 15, and supports the support shaft 11d.

  The bearing 16 rotatably supports the rotor 12 and the yoke 17 about the support shaft 11d. The lower end surfaces of the rotor 12 and the yoke 17 are fixed to the bearing 16 and are rotatably fitted to the outer periphery of the shaft support portion 15. A member having excellent sliding characteristics is used for the bearing 16.

  The yoke 17 prevents the magnetic flux from leaking. The yoke 17 is made of a cylindrical member. The yoke 17 surrounds the rotor 12 and is fixed to the outer periphery of the rotor 12. The yoke 17 is formed of, for example, a soft magnetic material.

  The terminal 18 is a connection terminal that conducts with the terminal of the winding of the coil 13. The four terminals 18 a to 18 d are fixed to the bearing 14. The ends of the coils 13 a and 13 b are connected to the four terminals 18 a to 18 d in the hollow portion 12 a of the rotor 12. Thereby, the part which the terminal 18 protrudes out of the bearing 14 can be made low.

  Here, the rotation operation of the rotor 12 of the electromagnetic actuator 10 will be described with reference to FIG. In FIG. 4, for easy understanding, the rotor 12 is shown in a developed state, and only the a pole, the b pole, and the c pole that are the magnetic poles of the rotor 12 and the stators 11 a to 11 c are shown. In FIG. 4, the rotor 12 rotates in the right direction, that is, in the clockwise direction.

  The state shown in FIG. 4A is a state in which the electromagnetic actuator 10 is excited by applying, for example, a positive current to the first coil 13a and applying a positive current to the second coil 13b, for example. By this excitation, the magnetic pole a (a pole) of the first stator portion 11a becomes the S pole, and the magnetic pole c (c pole) of the third stator portion 11c becomes the N pole. In this state, between the magnetic poles N1 and N2 of the rotor 12 and the a pole magnetized by the S pole of the first stator portion 11a, and between the magnetic poles S1 and S2 of the rotor 12 and the N pole of the third stator portion 11c. An attraction force is generated between the magnetized c pole and the rotor 12, and the rotor 12 is stably stopped.

  Next, when a positive current is applied to the first coil 13a and a negative current is applied to the second coil 13b at the position of the rotor 12 shown in FIG. 4 (A), excitation is performed as shown in FIG. 4 (B). As shown, the a pole of the first stator portion 11a is the S pole, the b pole of the second stator portion 11b is the N pole, and the c pole of the third stator portion 11c is the S pole. In this state, an attractive force is generated between the magnetic poles S1 and S2 of the rotor 12 and the b pole magnetized in the N pole, and at the same time, a repulsive force is generated between the magnetic poles N1 and N2 and the b pole. Further, an attractive force is generated between the magnetic poles N1 and N2 of the rotor 12 and the c pole magnetized in the S pole, and at the same time, a repulsive force is generated between the magnetic poles S1 and S2 and the c pole. As a result, rotational torque is generated in the rotor 12 so as to rotate in the clockwise direction, and the rotor 12 rotates by 45 degrees in the clockwise direction, resulting in the state shown in FIG.

  Next, when a negative current is applied to the first coil 13a and a negative current is applied to the second coil 13b at the rotational position of the rotor 12 shown in FIG. As shown, the a pole of the first stator portion 11a is an N pole, and the c pole of the third stator portion 11c is an S pole. In this state, an attractive force is generated between the magnetic poles S1 and S2 of the rotor 12 and the a pole magnetized at the N pole of the first stator portion 11a, and at the same time, repulsion is generated between the magnetic poles N1 and N2 and the a pole. Power is generated. Further, an attractive force is generated between the magnetic poles N1 and N2 of the rotor 12 and the c pole magnetized on the S pole of the third stator portion 11c, and at the same time, a repulsive force is generated between the magnetic poles S1 and S2 and the c pole. . Thereby, rotational torque is generated in the rotor 12 so as to rotate in the clockwise direction, and the rotor 12 is further rotated by 45 degrees in the clockwise direction, and the state shown in FIG. 4C is obtained.

  Next, when excitation is performed by applying a negative current to the first coil 13a and a positive current to the second coil 13b at the rotational position of the rotor 12 shown in FIG. 4C, FIG. As shown, the a pole of the first stator portion 11a is an N pole, the b pole of the second stator portion 11b is an S pole, and the c pole of the third stator portion 11c is an N pole. In this state, an attractive force is generated between the magnetic pole N1 and magnetic pole N2 of the rotor 12 and the b pole magnetized on the S pole of the second stator portion 11b, and at the same time, repulsion occurs between the magnetic poles S1 and S2 and the b pole. Power is generated. Further, an attractive force is generated between the magnetic poles S1 and S2 of the rotor 12 and the c pole magnetized to the N pole of the third stator portion 11c, and at the same time, a repulsive force is generated between the magnetic poles N1 and N2 and the c pole. Arise. As a result, rotational torque is generated in the rotor 12 so as to rotate in the clockwise direction, and the rotor 12 is further rotated by 45 degrees in the clockwise direction, and the state shown in FIG.

  Next, when excitation is performed by applying a positive current to the first coil 13a and a positive current to the second coil 13b at the rotational position of the rotor 12 shown in FIG. 4D, FIG. As shown, the a pole of the first stator portion 11a is the S pole, and the c pole of the third stator portion 11c is the N pole. In this state, an attractive force is generated between the magnetic poles N1 and N2 of the rotor 12 and the a pole magnetized at the S pole of the first stator portion 11a, and at the same time, repulsion between the magnetic poles S1 and S2 and the magnetic pole a. Power is generated. Further, an attractive force is generated between the magnetic poles S1 and S2 and the c pole magnetized to the N pole of the third stator portion 11c, and at the same time, a repulsive force is generated between the magnetic poles N1 and N2 and the c pole. As a result, rotational torque is generated in the rotor 12 so as to rotate in the clockwise direction, and the rotor 12 further rotates by 45 degrees in the clockwise direction, resulting in the state shown in FIG. The rotor 12 is rotated 180 degrees in the clockwise direction from the state shown in FIG.

  Further, as described with reference to FIGS. 4A to 4E, when the excitation of the first coil 13a and the second coil 13b is repeated, the rotor 12 continues to rotate in the clockwise direction. When the rotor 12 is to be rotated counterclockwise in the counterclockwise direction from the state shown in FIG. 4E, the operations described in FIG. 4A to FIG. The first coil 13a and the second coil 13b may be excited in the order from FIG. 4 (E) to FIG. 4 (A).

  A sector driving apparatus using the electromagnetic actuator 10 will be described with reference to FIG. The drive device for this sector is used in a small camera mounted on a portable device. The sector drive device 20 includes a pair of substrates 21 a and 21 b, a pair of sectors 22 a and 22 b, and an engagement pin 23. A drive pin 24 projects from the yoke 17 of the electromagnetic actuator 10 in parallel with the support shaft 11d. The first substrate 21a includes a shutter opening 211a, a convex portion 212a, and a support shaft hole 213a. The second substrate 21b includes a shutter opening 211b, a convex hole 212b, a support hole 213b, a drive pin notch 214b, and an engaging pin long hole 215b. The first sector 22a is formed with an engagement pin hole 221a, a support shaft hole 222a, and a drive pin hole 223a. The second sector 22b is formed with a convex hole 221b and an engagement pin notch 222b.

  The first substrate 21a and the second substrate 21b are combined so as to face each other, and the sectors 22a and 22b, the electromagnetic actuator 10 and the engagement pin 23 are arranged between the first substrate 21a and the second substrate 21b. Is done.

  The support shaft 11d of the electromagnetic actuator 10 is inserted into the support hole 213a of the first substrate 21a, the support hole 222a of the first sector 22a, and the support hole 213b of the second substrate 21b. The drive pin 24 of the electromagnetic actuator 10 is inserted into the drive pin hole 223a of the first sector 22a and is disposed in the drive pin notch 214b of the second substrate 21b. The engagement pin 23 is inserted into the engagement pin hole 221a of the first sector 22a, and the engagement pin notch 222b of the second sector 22b and the long hole for the engagement pin of the second substrate 21b. 215b. The convex portion 212a of the first substrate 21a is inserted into the convex portion hole 221b of the second sector 22b and the convex portion hole 212b of the second substrate 21b.

  In the sector drive device 20, when the rotor 12 is rotated clockwise in FIG. 5, the first sector 22a is rotated clockwise around the support shaft 11d via the drive pin 24. As the first sector 22a rotates in the clockwise direction, the engagement pin 23 engages with the engagement pin notch 222b of the second sector 22b, thereby causing the second sector 22b to rotate counterclockwise. Rotate. As described above, the shutter openings 211a and 211b are closed by rotating the first sector 22a and the second sector 22b in a direction in which they approach each other.

  Then, when the rotor 12 is rotated counterclockwise in FIG. 5, the first sector 22a is rotated counterclockwise around the support shaft 11d via the drive pin 24. As the first sector 22a rotates counterclockwise, the engagement pin 23 engages with the engagement pin notch 222b of the second sector 22b, and the second sector 22b moves clockwise. Rotate. Thus, the shutter openings 211a and 211b are opened by rotating the first sector 22a and the second sector 22b away from each other. In this manner, in the sector drive device 20, the sectors 22a and 22b are opened and closed.

  Here, a control circuit for controlling the electromagnetic actuator 10 in the sector drive device 20 will be described with reference to FIG. As shown in FIG. 6, the control unit 30 includes a CPU (Central Processing Unit) 31, a memory 32, and a driver 33. The CPU 31 performs control and arithmetic processing of the entire electromagnetic actuator 10. The memory 32 stores a program and control information for controlling the electromagnetic actuator 10. In response to a control signal from the CPU 31, the driver 33 energizes the coils 13a and 13b by passing a positive or negative drive current in pulses. An operation button 34 is connected to the CPU 31.

  When the operation button 34 is pressed, the CPU 31 instructs the driver 33 to output a positive current or a negative current in order to drive the electromagnetic actuator 10. The driver 33 supplies a positive current or a negative current to the coils 13a and 13b of the electromagnetic actuator 10 in accordance with the instruction. As described above, by energizing the coils 13a and 13b of the electromagnetic actuator 10 and rotating the rotor 12 of the electromagnetic actuator 10 in the clockwise direction or the counterclockwise direction as described with reference to FIG. 22b is driven and a shutter operation is performed.

  A lens driving device using the electromagnetic actuator 10 will be described with reference to FIGS. The same parts as those already described are denoted by the same reference numerals and description thereof is omitted. The lens driving device 40 includes a worm gear 42 and a lens holder 43 on a substrate 41. The worm gear 42 is provided on the substrate 41 by the support portion 45 so as to be rotatable about the shaft 42a. The lens holder 43 has a lens 44 at the center. A gear 43 a is provided on a part of the outer periphery, and the gear 43 a meshes with the worm gear 42. As the worm gear 42 rotates, the lens holder 43 moves in the optical axis direction while rotating, and focus adjustment is performed.

  As shown in FIG. 8, the worm gear 42 incorporates the electromagnetic actuator 10 so that the worm gear 42 can rotate. A yoke 17 is provided on the outer periphery of the rotor 12, and a worm gear 42 is fixed to the outer periphery of the yoke 17. Further, as shown in FIG. 9, a cam shaft 50 for moving the lens by a cam may be provided on the outer periphery of the yoke 17 instead of the worm gear 42.

  As described above, in the electromagnetic actuator according to the present embodiment, the first to third stator portions 11a to 11c are arranged with a certain interval in the axial direction of the support shaft 11d so that the directions of the axes coincide with each other. The entire actuator can be reduced in size. In addition, since the thickness t of the entire stator 11 is constant, the stator 11 can be manufactured easily because it can be stamped. Therefore, it is possible to reduce variations in component accuracy and assembly accuracy between the stator portions. As a result, the rotation stop position accuracy of each pulse of the rotor 12 of the electromagnetic actuator 10 can be improved, the torque unevenness at each point of the rotation angle 360 degrees of the rotor 12 can be reduced, and the electromagnetic actuator 10 It is possible to reduce the quality variation between the products.

  Further, in the electromagnetic actuator of the present embodiment, since the support shaft 11d and the first to third stator portions 11a to 11c are directly connected, there is no magnetic separation and the portion where the magnetic flux is most concentrated. The support shaft 11d having a large cross-sectional area can be disposed, and the magnetic resistance can be reduced. Therefore, the motor efficiency is improved. Further, by incorporating the support shaft 11d into the magnetic path, the support shaft 11d can be used as a magnetic circuit, so that the diameter of the electromagnetic actuator 10 can be reduced.

  Further, in the electromagnetic actuator of the present embodiment, the rotor 12 can be manufactured by rolling a sheet having N and S poles into a cylindrical shape, so that the rotor 12 can be manufactured easily. In addition, the rotor 12 can be easily magnetized because it can be magnetized along the oblique side 12a of the parallelogram sheet.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the present embodiment, the example in which the rotor 12 is formed of a parallelogram sheet as shown in FIG. 3 has been described. However, as shown in FIG. The rotor 62 can also be configured by arranging the shape members (units) 621a to 624c. The units 621a to 624c are fixed to each other, and become the rotor 62 by rounding into a cylindrical shape.

  Magnetic poles corresponding to the magnetic pole S1 of the rotor 12 shown in FIG. 3 are configured by the units 621a to 621c magnetized to the S pole. The units 621a to 621c are arranged sequentially shifted in the rotation direction. The units 621a, 621b, and 621c are arranged at positions that can face the a pole of the first stator portion 11a, the b pole of the second stator portion 11b, and the c pole of the third stator portion 11c, respectively. . Similarly, the units 622a to 622c, the units 623a to 623c, and the units 624a to 624c constitute magnetic poles corresponding to the magnetic poles N1, S2, and N2 of the rotor 12, respectively, and are sequentially shifted in the rotation direction. The first to third stator portions 11a to 11c are disposed at positions that can face the c-pole from the a-pole.

  In the present embodiment, the example in which the three stator portions 11a to 11c and the support shaft 11d are integrally formed has been described. However, the three stator portions 11a to 11c and the support shaft 11d are formed as separate bodies, and the support is supported. You may make it fix the three stator parts 11a-11c to the axis | shaft 11d.

  Moreover, although this embodiment demonstrated the example using three stator parts 11a-11c and two coils 13a and 14b, the number of stator parts is not restricted to three, It may be more or less than three. The number of coils wound between the stator portions is not limited to two, and may be one or three or more according to the number of stators.

  Moreover, although this embodiment demonstrated the example which forms the three stator parts 11a-11c from a prismatic rod-shaped member, the shape of the stator parts 11a-11c is not limited to a prismatic rod-shaped member, and is a cylindrical rod-shaped member. A member may be sufficient as long as the tip which becomes a magnetic pole faces the magnetic pole on the inner peripheral surface of the rotor 12.

  Further, in the present embodiment, an example in which the rotor 12 is magnetized with four poles inside has been described, but the number of poles of the rotor 12 may be more or less than four.

  In the present embodiment, the example including the bearing 14, the shaft support 15 that supports the rotation of the rotor 12, and the bearing 16 has been described. However, instead of the bearing 14, a shaft support and a bearing may be used. Alternatively, a lower lid may be used instead of the shaft support 15 and the bearing 16.

  In this embodiment, the example in which the yoke 17 is fixed to the rotor 12 and rotated is described. However, the yoke 17 does not necessarily have to be fixed to the rotor 12. For example, the yoke 17 is arranged around the rotor 12. Also good.

  In the present embodiment, the example in which the coil 13 is directly wound around the support shaft 11d has been described. However, a coil bobbin may be used.

  Moreover, although this embodiment demonstrated the example which uses the member excellent in the sliding characteristic about the bearing 16, you may use a rolling bearing.

  In this embodiment, the winding diameter of the coil 13 is substantially the same as the lengths of the first to third stator portions 11a to 11c in FIGS. 1 and 2, but it is naturally possible to make it smaller. .

  Further, in the present embodiment, an example in which the electromagnetic actuator 10 is a stepping motor has been described. However, the present invention is not limited to a stepping motor, and can be applied as a swing motor that is provided with a determining member and whose rotation is limited within a certain range. .

  In the present embodiment, the electromagnetic actuator 10 has been described as being used in a sector camera drive device and a lens drive device of a small camera mounted on a portable device. However, the present invention is not limited to this example. It can also be used for a vibration generator of a device or a mobile phone, and can also be used for a copier, a facsimile, a printer, or the like.

(a) is sectional drawing showing the structure of the electromagnetic actuator which concerns on embodiment of this invention, (b) is a top view showing the structure of the electromagnetic actuator shown to (a). (a) is a partially omitted cross-sectional view of the electromagnetic actuator shown in FIG. 1 when viewed from the A direction, and (b) is a plan view showing the configuration of the electromagnetic actuator shown in (a). FIG. 2 is a development view of a rotor provided in the electromagnetic actuator shown in FIG. 1. It is explanatory drawing for demonstrating the rotation principle of the rotor in the electromagnetic actuator which concerns on embodiment of this invention. It is a disassembled perspective view of the drive device of the sector provided with the electromagnetic actuator which concerns on embodiment of this invention. It is a block diagram of a control circuit for controlling an electromagnetic actuator concerning an embodiment of the present invention. It is a front view of the drive device of the lens provided with the electromagnetic actuator concerning the embodiment of the present invention. It is sectional drawing of the principal part of FIG. It is a perspective view of the principal part of the drive device of the lens using the cam provided with the electromagnetic actuator which concerns on embodiment of this invention. It is an expanded view of the modification of the rotor with which the electromagnetic actuator which concerns on embodiment of this invention was provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic actuator 11 Stator 11a-11c 1st-3rd stator part 11d Spindle 12 Rotor 13 Coil 13a, 13b 1st, 2nd coil 17 Yoke N1, N2, S1, S2 Magnetic pole a pole of a rotor, b pole , C pole Magnetic poles of the first to third stator parts

Claims (5)

A stator composed of a support shaft and a plurality of rod-like members provided side by side in the axial direction of the support shaft around the support shaft;
A coil wound around the spindle between the plurality of rod-shaped members;
It has a plurality of magnetic poles in the rotation direction, the magnetized surfaces of the plurality of magnetic poles are inclined with respect to the axial direction of the support shaft, and the ends of the plurality of magnetic poles and the plurality of rod-shaped members are opposed to each other. As described above, the stator is disposed inside, and the rotor rotates about the support shaft.   2. The electromagnetic actuator according to claim 1, wherein the rotor is formed by rolling a sheet having a parallelogram outer shape, and a magnetic pole surface is provided in a direction parallel to the oblique side of the parallelogram sheet. .   2. The rectangular member according to claim 1, wherein a plurality of magnetized rectangular members are arranged to form the rotor, and are sequentially shifted in the rotational direction and magnetized to the same pole in the axial direction of the support shaft. An electromagnetic actuator, characterized in that the are arranged.   4. The electromagnetic actuator according to claim 1, wherein the support shaft and the plurality of rod-shaped members are integrally formed. 5. 5. The electromagnetic actuator according to claim 1, wherein a yoke for preventing magnetic flux leakage is integrally provided on an outer periphery of the rotor, and transmission for transmitting a driving force of the rotor to the outer periphery of the yoke is provided. The drive device characterized by the above-mentioned.

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