JP5010906B2 - Electromagnetic actuator - Google Patents

Description

  The present invention relates to an electromagnetic actuator used as a drive source for a shutter, a lens cover, etc. of a digital camera, and relates to an electromagnetic actuator provided with a rotor that rotates within a predetermined rotation angle.

  Among the electromagnetic actuators, a rotor that is composed of a permanent magnet magnetized with two poles, a ring-shaped yoke that is disposed so as to surround the outer periphery of the rotor, and is formed of a magnetic member, and the yoke And a coil disposed at positions facing each other with a rotor in between.

This type of electromagnetic actuator generates a holding force by using an attractive force acting between the yoke and the rotor and holds it in both directions. Regarding the operation, the rotor held in one side is used as a coil. When it is energized, it is rotated to the other side. By energizing the coil with electricity having the opposite polarity from this state, the direction of the magnetic field is changed and the original position is restored.
Various types of such electromagnetic actuators are known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2002-116478 (page 11, FIG. 1)

An outline of the technique of Patent Document 1 will be described with reference to FIG.
FIG. 10 is a diagram for explaining a conventional electromagnetic actuator. The electromagnetic actuator 200 is disposed so as to surround a rotor 201 that is composed of a permanent magnet magnetized with two poles and is rotatably arranged. A ring-shaped yoke 202 formed of a magnetic member, a coil 203 that drives the rotor 201 and is disposed inside the yoke 202 with the rotor 201 in between. The magnetic pins 204, 204 are positioned perpendicular to the facing direction and are used for positioning the rotor 201.

  As described above, the conventional electromagnetic actuator 200 is a bistable actuator that rotates the rotor 201 within the predetermined rotation angle θ1 and can be self-held at both ends of the predetermined rotation angle θ1, and uses the magnetic pins 204 and 204. The rotor 201 is self-held by the magnetic action of the rotor 201 and the yoke 202 when no current is applied to both ends within the predetermined rotation angle.

  However, in such an electromagnetic actuator 200, the magnetic attractive force (or magnetic repulsive force) varies due to the positions where the magnetic pins 204, 204 are disposed and the magnetic pins 204, 204 themselves. Along with this, the operating voltage by the coil 203 is greatly influenced, so that there is a great variation in the electrical characteristics of the actuator. Therefore, a large margin is required for the operating voltage and the like for practical use.

  In addition, the magnetic pins 204 for obtaining the magnetic attractive force (or magnetic repulsive force) are essential, and at least one of them is arranged, and the structure for holding the magnetic pins 204 is complicated. became.

  For example, when developing a monostable type (monostable type) electromagnetic actuator that energizes the coil, rotates the rotor held on one side to the other side, and self-resets to the other side when the current is released. There is the above problem.

In this case, it is also preferable that the attractive force (or magnetic repulsive force) of the rotor can be varied so that the operating voltage can be selectively set.
In addition to expanding the application of the actuator, it is possible to set the actuator that rotates the rotor clockwise or counterclockwise using a common component when the coil is energized. Is preferable.

  An object of the present invention is to provide a semi-stable electromagnetic actuator capable of stabilizing the operating voltage and the like by making the attraction force of the rotor uniform and simplifying the structure of the actuator. It is another object of the present invention to make it possible to selectively set the operating voltage and the like and to arbitrarily set the rotation direction of the rotor.

The invention according to claim 1 is a rotor magnetized in two poles in a radial direction on a cylindrical magnetic body, a support body that rotatably supports the rotor within a predetermined rotation angle, and outer diameters of both end faces of the rotor. The coil is wound around the support so as to pass through the coil, and the coil that drives the rotor and the rotor, the support, and a part of the coil are collectively covered so as to be orthogonal to the magnetic pole direction of the rotor. An electromagnetic actuator comprising a substantially cylindrical yoke disposed at a position, wherein the rotor rotates within a predetermined rotation angle by input to the coil, and a window for generating a difference in attraction force between the rotor and the yoke on the yoke When the coil is energized, when the coil is energized, the boundary surface between the north and south poles appearing on the cylindrical surface of the rotor is brought near the end of the window-shaped hole, and the coil is de-energized. Set the boundary to the position where the inside of the window-shaped hole is cut. It is, to hold the rotor in one of the predetermined rotation angle, the support includes a convex portion to be fitted to the yoke, the yoke comprises a plurality of recesses for fitting the convex portion, to the plurality of recesses The holding force for holding the rotor is adjusted by selectively fitting the convex portions .

The invention according to claim 2 is characterized in that the rotor is allowed to rotate in either the counterclockwise direction or the clockwise direction when the coil is energized by providing the yoke with two combinations of a plurality of recesses. To do.

  In the invention according to claim 1, the yoke is provided with a window-like hole that generates a difference in attractive force between the rotor and the yoke, and when the coil is energized, the N pole and the S pole appearing on the cylindrical surface of the rotor. Set the boundary surface in the vicinity of the edge of the window-shaped hole and set the boundary surface to the inside of the window-shaped hole when the coil is de-energized. One of them was held.

As described above, the difference in the attractive force is created by the window-like hole provided in the yoke, so that there is less variation in the set position than when a magnetic member such as a magnetic pin is disposed inside the yoke. As a result, the attraction force of the rotor can be made uniform, and the operating voltage applied to the coil can be stabilized.
Furthermore, since it is a window-like hole provided in the yoke that creates the difference in suction force, the structure of the actuator can be simplified. Thereby, the number of parts of the actuator can be reduced. As a result, the productivity of the actuator can be improved.

In addition , the support includes a convex portion that fits into the yoke, the yoke includes a plurality of concave portions that fit into the convex portion, and the rotor is configured by selectively fitting the convex portions into the plurality of concave portions. The self-holding force (suction force) for holding can be adjusted. Thus, by adjusting the self-holding force of the rotor, it is possible to change characteristics such as the operating voltage applied to the coil. Thereby, an actuator having different characteristics such as holding force or operating voltage can be selected according to the application.

In the invention according to claim 2 , by providing the yoke with two combinations of the plurality of recesses, the rotor can be rotated in either the counterclockwise direction or the clockwise direction when the coil is energized. As a result, the application of the actuator can be expanded.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
1 is a perspective view of an electromagnetic actuator according to the present invention, FIG. 2 is an exploded perspective view of the electromagnetic actuator shown in FIG. 1, and FIG. 3 is a plan view of the electromagnetic actuator shown in FIG. 4 is a sectional view taken along line 4-4 of FIG. 1, and FIG. 5 is a sectional view taken along line 5-5 of FIG.

  As shown in FIGS. 1 and 2, the electromagnetic actuator 10 includes a rotor 12 having a cylindrical magnetic body as a main component, a support 13 that rotatably supports the rotor 12, and a winding around the support 13. Coil 14 and a yoke 15 disposed around the cylindrical surface of the rotor 12 while covering a part of the rotor 12, the support 13 and the coil 14 together. The rotor 12 is held on one side, the rotor 12 rotates to the other side when the coil 14 is energized, and the rotor 12 self-resets on one side when the energization is released. .

  The rotor 12 is composed of a permanent magnet (magnetic body) 21 magnetized with two poles of an S pole and an N pole in a radial direction indicated by an arrow A1 of a cylindrical magnetic body, and both end faces 21a and 21a of the permanent magnet 21. A shaft 22 provided at the center, a circular flange 23 formed at the lower portion of the shaft 22, a fan-shaped flange 24 extending in a fan shape outward from the upper portion of the shaft 22, and an upper surface of the fan-shaped flange 24 And a stopper piece 26 extending downward from the outer periphery of the fan-shaped flange 24 and extending along the cylindrical surface 21 b of the permanent magnet 21.

  Note that both end surfaces 21 a and 21 a of the permanent magnet 21 are also both end surfaces of the rotor 12. The cylindrical surface 21 b of the permanent magnet 21 is also the cylindrical surface of the rotor 12.

The shaft 22 is formed in a through hole 28 provided in the center of a cylindrical permanent magnet (magnetic body) 21 and is fixed to the permanent magnet 21. Moreover, it fits in the support body 13 and is rotatably supported.
The circular flange 23 and the fan-shaped flange 24 have a function of preventing the shaft 22 from coming off.

  The operating piece 25 includes a stay portion 31 that extends upward and outward from the upper surface of the fan-shaped flange 24 and an operating pole 32 that extends upward to the tip portion of the stay portion 31. This is a part for operating an operating body (not shown) such as a shutter or a lens cover of the digital camera. Further, the operating piece 25 extends to one of the radially outer sides around the boundary surface 33 between the N pole and the S pole appearing on the cylindrical surface 21 b of the permanent magnet 21.

  The stopper piece 26 is a portion that hits a predetermined part of the support 13 when the rotor 12 is rotated in both directions within a predetermined rotation angle within the support 13, and appears on the cylindrical surface 21 b of the permanent magnet 21. It is suspended around the boundary surface 33 between the pole and the S pole.

  The shaft 22, the circular flange 23, the fan-shaped flange 24, the operating piece 25, and the stopper piece 26 are integrally formed on the permanent magnet 21 by insert molding or the like. Thereby, the productivity of the rotor 12 can be improved. As a result, the cost of the actuator can be reduced.

  The support 13 is preferably a member formed of a non-magnetic material such as a resin, and an upper support 34 that rotatably supports the upper end of the shaft 22 of the rotor 12 and a lower end of the shaft 22 of the rotor 12 are rotated. It consists of a lower support 35 that supports it.

  The upper support 34 is positioned on the upper support part (upper support hole) 36 that supports the upper end of the shaft 22 of the rotor 12, the upper groove 37 around which the coil 14 is wound, and the stopper piece 26 of the rotor 12. In order to match the portion 38 and the other positioning portion 39 with the lower support 35 at a predetermined position, the fitting surfaces 41 and 41 having holes 41a and 41a are fitted to the yoke 15 and the phase with the yoke 15 is adjusted. It has the convex part (protrusion) 42 to match, and the receiving surface 43 (refer FIG. 4) which receives the rotor 12. As shown in FIG.

As shown in FIG. 4, the upper support portion (upper support hole) 36 has a receiving surface 43 that receives the rotor 12, thereby reducing the frictional force when the rotor 12 rotates.
The upper groove 37 has a ceiling groove 44 formed on the upper surface of the upper support 34, and side grooves 45, 45 that are suspended from the ceiling groove 44 and formed on the side surface of the upper support 34.
The positioning portions 38 and 39 are portions that regulate the rotation angle of the rotor 12.

  The lower support 35 is aligned with the lower support 46 (lower support hole) 46 that supports the lower end of the shaft 22 of the rotor 12, the lower groove 47 that winds the coil 14, and the upper support 34 at a predetermined position. The bosses 51 and 51 are inserted into the holes 41a and 41a of the fitting surfaces 41 and 41, and the receiving surface 53 (see FIG. 4) for receiving the rotor 12.

As shown in FIG. 4, the lower support portion (lower support hole) 46 includes a receiving surface 53 that receives the rotor 12. Thereby, the frictional force at the time of rotation of the rotor 12 can be made small.
The lower groove 47 includes a bottom groove 54 formed on the lower surface of the lower support body 35, and side grooves 55 and 55 formed on the side surface of the lower support body 35 while being formed above the bottom groove 54.

  As described above, the concave portion 56 of the support body 13 is a loop-shaped portion constituted by the ceiling groove 44 and the side grooves 45 and 45 of the upper groove 37 and the bottom groove 54 and the side grooves 55 and 55 of the lower groove 47. .

  That is, the support 13 is configured by an upper support 34 and a lower support 35 by being divided into two in the direction of the axis 22 of the rotor 12. Accordingly, the upper end of the shaft 22 of the rotor 12 is inserted into the upper support 34, and the lower end of the shaft 22 of the rotor 12 is inserted into the lower support 35 in this state, and the lower support 35 is aligned with the upper support 34. Thus, the rotor 12 can be assembled to the support 13. As a result, the rotor 12 can be easily assembled to the support 13.

  In addition, the upper support 34 is provided with fitting surfaces 41 and 41 having holes 41a and 41a, and the lower support 35 is provided with bosses 51 and 51 for alignment with the upper support 34 at a predetermined position. The lower support 35 can be accurately aligned with the body 34.

As shown in FIG. 5, the support portion 13 is formed with a concave portion 56 around which the coil 14 is wound by combining the upper groove 37 and the lower groove 47, and the wound coil 14 is formed by the support body 13. It has a depth to be stored in the outer shape. Thereby, the coil 14 can be formed in the support body 13, and the cylindrical yoke 15 can be covered around the support body 13 side.
Further, the upper support 34 and the lower support 35 are integrally fixed by winding the coil 14.

  As shown in FIG. 5, the coil 14 is wound around the support 13 in a loop shape so as to pass through the outer diameters of both end faces 21 a and 21 a of the rotor 12. Is to drive.

  The yoke 15 is a member formed of a substantially cylindrical magnetic body, and is formed at the upper end of the substantially cylindrical shape. When the convex portion (projection) 42 of the support 13 is fitted and the coil 14 is energized, the rotor 15 is rotated. The counterclockwise setting position aligning portion 57 that sets 12 counterclockwise and the convex portion 42 of the support 13 are fitted, and when the coil 14 is energized, the rotor 12 is set clockwise. And a window-shaped hole 63, 64 formed on a substantially cylindrical side surface for generating a difference in suction force between the rotor 12 and the yoke 15.

  The alignment portion 57 is provided at the upper end of the substantially cylindrical yoke 15, and has a first recess (alignment groove) 71 that sets the holding force of the rotor 12 small, and the holding force of the rotor 12 is moderate. The second recess (alignment groove) 72 to be set to, and the third recess (alignment groove) 73 to set the holding force of the rotor 12 large.

  The alignment portion 58 is provided at the upper end of the substantially cylindrical yoke 15, and has a first recess (alignment groove) 74 that sets the holding force of the rotor 12 small, and the holding force of the rotor 12 is moderate. The second recess (alignment groove) 75 to be set to, and the third recess (alignment groove) 76 to set the holding force of the rotor 12 large.

  As shown in FIG. 2, the relationship between the window-shaped holes 63 and 64 is provided to face each other with the rotor 12 interposed therebetween. As for the relationship between the window-shaped hole 64 and the alignment portions 57 and 58, the alignment portions 57 and 58 are provided above the window-shaped hole 64 and sandwiching the window-shaped hole 64.

  In the electromagnetic actuator 10, the yoke 15 is provided with window-like holes 63 and 64 that generate a difference in attractive force between the rotor 12 and the yoke 15, and N appears on the cylindrical surface 21 b of the rotor 12 when the coil 14 is energized. When the boundary surface 33 between the pole and the S pole faces the end portions 63a and 64a of the window-shaped holes 63 and 64 or in the vicinity of the end portions 63b and 64b, and the coil 14 is deenergized, the boundary surface 33 is The rotor 12 is held at one of the predetermined rotation angles by setting it to a position where it is bitten inside the holes 63 and 64 in the shape of a ring.

  As described above, the difference in the attractive force is created by the window-shaped holes 63 and 64 provided in the yoke 15, so that, for example, the setting position varies more than in the case where a magnetic member such as a magnetic pin is disposed inside the yoke 15. Less is. As a result, the attraction force of the rotor 12 can be made uniform, and the operating voltage applied to the coil 14 can be stabilized.

  Further, the difference in the suction force is created by the window-like holes 63 and 64 provided in the yoke 15, so that the structure of the actuator can be simplified. Thereby, the number of parts of the actuator can be reduced, and the productivity of the actuator can be improved.

FIG. 6 is an explanatory diagram of the counterclockwise setting of the electromagnetic actuator according to the present invention.
The electromagnetic actuator 10 shown in FIGS. 1 to 5 is also an actuator set counterclockwise. In FIGS. 6 and 7, the electromagnetic actuator 10 is described as a counterclockwise electromagnetic actuator 10A. In addition, one side of the support 13 refers to the one positioning portion 38 side of the support 13, and the other side of the support 13 refers to the other positioning portion 39 side of the support 13.

  The counterclockwise electromagnetic actuator 10A is configured such that the convex portion (projection) 42 of the support 13 is fitted to the alignment portion 57, so that the rotor 12 rotates counterclockwise when energized, and is not energized. This is an actuator that self-returns to its original position when

  Specifically, when the coil 14 is energized, the rotor 12 rotates counterclockwise as indicated by an arrow a1 to the other side of the support 13 and the boundary surface 33 between the N pole and the S pole appearing on the cylindrical surface 21 of the rotor 12. However, it faces the vicinity of the end portions 63a and 64a of the window-like holes 63 and 64. When the coil 14 is deenergized, the rotor self-returns to one side of the support 13 as indicated by the arrow a2 by the magnetic action of the rotor 12 and the yoke 15, and the boundary surface 33 is formed by the window-shaped holes 63 and 64. It returns to the position where it digs inside.

As described above, when the electromagnetic actuator 10A is not energized, the rotor 12 is held on one side of the support 13 and when the coil 14 is energized, the rotor 12 rotates to the other side. This is a monostable (monostable) actuator in which the rotor 12 self-resets.
Next, a case where the holding force of the electromagnetic actuator 10A is changed when setting counterclockwise will be described.

FIGS. 7A to 7C are comparative explanatory views when the holding force of the electromagnetic actuator shown in FIG. 6 is changed.
In (a), the first embodiment of the counterclockwise electromagnetic actuator 10A is shown, and the convex portion (the alignment groove) 71 of the counterclockwise setting positioning portion 57 is formed in the first concave portion (alignment groove) 71 ( (Projection) 42 is shown, the predetermined rotation angle of the rotor 12 at this time is α1, the center line L1 of the window-like holes 63 and 64, the center of the rotor 12 and the convex portion 42 of the support 13 The angle with the extension line L2 is a set angle β1 that determines the holding force. The predetermined rotation angle α1 is a constant angle.

  In (b), the second embodiment of the counterclockwise electromagnetic actuator 10A is shown, and the convex portion 42 of the support 13 is fitted in the second concave portion (alignment groove) 72 of the alignment portion 57. In this case, the angle between the center line L1 of the window-shaped holes 63 and 64 and the extension line L2 between the center of the rotor 12 and the convex portion 42 of the support 13 is set as an angle β2 that determines the holding force.

  In (c), the third embodiment of the counterclockwise electromagnetic actuator 10A is shown, and the convex portion 42 of the support 13 is fitted in the third concave portion (alignment groove) 73 of the alignment portion 57. In this case, the angle between the center line L1 of the window-shaped holes 63 and 64 and the extension line L2 between the center of the rotor 12 and the convex portion 42 of the support 13 is set as an angle β3 that determines the holding force.

  When the setting states of (a) to (c) are compared, there is a relationship of β1> β2> β3, and the self-holding position when the coil 14 is deenergized as the setting angle β1 decreases from the setting angle β3. The boundary surface 33 is closer to the ends 63a and 64a of the window-shaped holes 63 and 64. As a result of the confirmation, the holding force of the rotor 12 is the largest at the set angle β3, the holding force is medium at the set angle β2, and the holding force is the smallest at the set angle β1.

  Note that the above relationship may be that the holding force does not increase as the magnetic field strength changes due to the relationship between the window-shaped holes 63 and 64 and the alignment portion 57 and increases from the set angle β3 to the set angle β1. Although it is possible, it is possible to vary the self-holding force.

  That is, the support 13 includes a convex portion (projection) 42 that fits into the yoke 15, and the yoke 15 includes a plurality of concave portions (alignment grooves) 71 to 73 that fit into the convex portion 42. By selectively fitting the convex portions 42 to the concave portions 71 to 73, the self-holding force (suction force) for holding the rotor 12 can be adjusted. Thus, by adjusting the self-holding force of the rotor 12, characteristics such as the operating voltage applied to the coil 14 can be changed. As a result, it is possible to supply an actuator whose characteristics such as the self-holding force or the operating voltage are changed according to the application.

  FIG. 8 is an explanatory view of clockwise setting of the electromagnetic actuator according to the present invention. 8 and 9, the electromagnetic actuator 10 is described as a clockwise electromagnetic actuator 10B. In addition, one side of the support 13 refers to the one positioning portion 38 side of the support 13, and the other side of the support 13 refers to the other positioning portion 39 side of the support 13.

  The clockwise electromagnetic actuator 10B is configured such that the convex portion (protrusion) 42 of the support 13 is fitted to the alignment portion 58 so that the rotor 12 rotates clockwise when energized and is unenergized when de-energized. The actuator is designed to self-return to the position.

  Specifically, when the coil 14 is energized, the rotor 12 rotates clockwise as indicated by an arrow b1 to one side of the support 13, and the boundary surface 33 between the N pole and the S pole appearing on the cylindrical surface 21 of the rotor 12. It faces near the end portions 63b and 64b of the window-shaped holes 63 and 64. Further, when the coil 14 is deenergized, the rotor self-returns to the other side of the support 13 as indicated by the arrow b2 by the magnetic action of the rotor 12 and the yoke 15, and the boundary surface 33 is formed by the window-shaped holes 63 and 64. It returns to the position where it digs inside.

  As described above, when the electromagnetic actuator 10B is not energized, the rotor 12 is held on the other side of the support 13, and the coil 12 is energized to rotate the rotor 12 to one side. This is a monostable (monostable) actuator in which the rotor 12 self-resets.

As shown in FIGS. 6 and 8, in the electromagnetic actuators 10 </ b> A and 10 </ b> B, the yoke 15 includes two combinations of a plurality of recesses such as a plurality of recesses 71 to 73 and a plurality of recesses 74 to 76. When the coil 14 is energized, the rotor 12 can be rotated in either the counterclockwise direction or the clockwise direction. As a result, the application of the actuator can be expanded.
Next, a case where the holding force of the electromagnetic actuator 10B is changed when setting clockwise will be described.

FIGS. 9A to 9C are comparative explanatory views when the holding force of the electromagnetic actuator shown in FIG. 8 is changed.
In (a), a first embodiment of the clockwise electromagnetic actuator 10B is shown, and the convex portion (protrusion) of the support 13 is formed in the first concave portion (alignment groove) 74 of the positioning portion 58 for clockwise setting. 42, the predetermined rotation angle of the rotor 12 is α1, the center line L1 of the window-like holes 63 and 64, and the extension line between the center of the rotor 12 and the convex portion 42 of the support 13 The angle with L2 is a set angle β1 that determines the holding force. The predetermined rotation angle α1 is a constant angle.

  7B shows a second embodiment of the clockwise electromagnetic actuator 10B, and shows a case where the convex portion 42 of the support 13 is fitted in the second concave portion (alignment groove) 75 of the alignment portion 58. FIG. The angle between the center line L1 of the window-like holes 63 and 64 at this time and the extension line L2 between the center of the rotor 12 and the convex portion 42 of the support 13 is set as an angle β2 that determines the holding force.

  3C shows a third embodiment of the clockwise electromagnetic actuator 10B, and shows a case where the convex portion 42 of the support 13 is fitted in the third concave portion (alignment groove) 76 of the alignment portion 58. FIG. The angle between the center line L1 of the window-like holes 63 and 64 at this time and the extension line L2 between the center of the rotor 12 and the convex portion 42 of the support 13 is set as an angle β3 that determines the holding force.

  When the setting states of (a) to (c) are compared, there is a relationship of β1> β2> β3, and the self-holding position when the coil 14 is deenergized as the setting angle β1 decreases from the setting angle β3. The boundary surface 33 in FIG. 6 approaches the end portions 63b and 64b of the window-shaped holes 63 and 64. As a result of the confirmation, the holding force of the rotor 12 is the largest at the set angle β3, the holding force is medium at the set angle β2, and the holding force is the smallest at the set angle β1.

Note that the above relationship may be that the strength of the magnetic field changes depending on the relationship between the window-shaped holes 63 and 64 and the alignment portion 58, and the holding force does not increase as the setting angle β3 increases from the setting angle β1. Although it is possible, it is possible to vary the self-holding force.
That is, as shown in FIGS. 7 and 9, the self-holding force (suction force) for holding the rotor 12 can be adjusted by either the counterclockwise electromagnetic actuator 10A or the clockwise electromagnetic actuator 10B.

In addition, the electromagnetic actuator which concerns on this invention may comprise the window-shaped holes 63 and 64 by many holes like a punching metal, or several slits.
The window-like holes 63 and 64 are rectangular holes, but may be round holes or rectangular holes with curved corners.

  The electromagnetic actuator according to the present invention is suitable for use in small electronic devices such as shutters and lens covers of digital cameras.

It is a perspective view of the electromagnetic actuator which concerns on this invention. FIG. 2 is an exploded perspective view of the electromagnetic actuator shown in FIG. 1. FIG. 2 is a plan view of the electromagnetic actuator shown in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is explanatory drawing of the counterclockwise setting of the electromagnetic actuator which concerns on this invention. FIG. 7 is a comparative explanatory diagram when the holding force of the electromagnetic actuator shown in FIG. 6 is changed. It is explanatory drawing of the clockwise setting of the electromagnetic actuator which concerns on this invention. FIG. 9 is a comparative explanatory diagram when the holding force of the electromagnetic actuator shown in FIG. 8 is changed. It is a figure explaining the conventional electromagnetic actuator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Electromagnetic actuator, 12 ... Rotor, 13 ... Support, 14 ... Coil, 15 ... Yoke, 21a, 21a ... Both end surfaces, 21b ... Cylindrical surface, 22 ... Shaft, 25 ... Actuation piece, 26 ... Stopper piece, 33 ... Boundary surface between N pole and S pole, 42 ... convex part (projection), 63, 64 ... window-like hole, 63a, 63b, 64a, 64b ... end part, 71 to 73 ... a plurality of concave parts (alignment grooves) , 74 to 76 ... a plurality of recesses (alignment grooves).

Claims (2)

A rotor magnetized in two poles in a radial direction on a cylindrical magnetic body, a support body that supports the rotor so as to be rotatable within a predetermined rotation angle, and the support that passes through the outer diameter of both end faces of the rotor. A coil that is wound around the body in a loop shape and covers the coils that drive the rotor, and the rotor, support, and a part of the coils at a time, and is arranged at a position that is perpendicular to the magnetic pole direction of the rotor. An electromagnetic actuator comprising a substantially cylindrical yoke, wherein the rotor rotates within a predetermined rotation angle by an input to the coil;
The yoke has a window-like hole that generates a difference in attractive force between the rotor and the yoke. When the coil is energized, a boundary surface between the N pole and the S pole that appears on the cylindrical surface of the rotor is formed. The rotor faces the vicinity of the end of the window-shaped hole, and when the coil is de-energized, the boundary surface is set at a position where it is cut into the window-shaped hole. Hold it at one of the specified rotation angles ,
The support includes a convex portion that fits into the yoke, the yoke includes a plurality of concave portions that fit into the convex portion, and the convex portions are selectively fitted into the plurality of concave portions. The electromagnetic actuator is characterized by adjusting a holding force for holding the rotor . The yoke is, by providing two kinds of combinations of the plurality of recesses, when energizing the coil, according to claim 1, in either direction of the counterclockwise direction and clockwise direction, characterized in that permit rotation of said rotor The electromagnetic actuator described.

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