JP2010148298A - Rotary actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary actuator for which nearly consistent torque characteristics with neither decline in rotating torque nor uneven torque can be assured without increasing the size and weight of the entire body by suppressing magnetic saturation in the latter half process of rotation within an operation angle range. <P>SOLUTION: In the latter half process of rotation wherein a plate magnet 8 reaches a stop position L from an initial position H and magnetic saturation easily occurs, a magnetic flux from an auxiliary magnet 11 acts on a magnetic flux from a coil body 3 and a magnetic flux from magnetic pole planes 8a-8d to demagnetize them. In the latter half process of rotation of the plate magnet 8, magnetic saturation is suppressed and thereby there arises no decline in rotating torque. Nearly consistent rotating torque characteristics having neither decline in rotating torque nor uneven torque, therefore, is secured within a predetermined operation angle range α. An auxiliary magnet 11 is downsized, as provided between adjacent segment core portions 9, so that the whole body is built in a simple and light-weight configuration. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary actuator equipped for driving a vehicle electrical component or the like, and more particularly to a rotary actuator that is rotated by an interaction between an electromagnetic force of a coil body and a magnetic force of a magnet.

  The rotary mechanism as a rotary actuator includes various valve opening and closing mechanisms, a shade that controls light distribution of the low and high of the discharge type headlight, a leveler that adjusts the irradiation direction up and down, an AFS that adjusts the irradiation direction to the left and right, and This is applied to a shift lever locking device of a vehicle (AT vehicle) equipped with an automatic transmission.

As an example of the rotation mechanism, there is a torque motor applied to a throttle device for an internal combustion engine, which includes a pair of stator cores having an arm portion and a tooth portion. The stator core is substantially L-shaped and arranged in an opposing state, and a rotor is provided between the tooth portions and a coil portion is arranged between the arm portions (see, for example, Patent Document 1).
The rotor has a pair of permanent magnets magnetized in a predetermined direction. When the coil portion is energized, an interaction between the electromagnetic force from the coil portion and the magnetic force from the permanent magnet occurs. As a result, a magnetic circuit is formed between the rotor and the stator core, and the rotor receives rotational torque and rotates in a predetermined direction.
That is, the rotor is reciprocated in a predetermined operating angle range in the forward and reverse directions depending on the energization direction of the coil portion, and the throttle valve for adjusting the intake flow rate of the internal combustion engine is opened and closed.

As a similar torque motor, there is one in which a ring-shaped stator is disposed around a rotor of a permanent magnet (see, for example, Patent Document 2). The stator has a stator piece that can be divided into upper and lower parts, and accommodates a coil portion between the stator pieces when the stator pieces are combined. When the coil portion is magnetically excited by an AC power supply, a rotating magnetic field is generated in the stator piece to rotate the rotor.
JP 2000-139067 A JP 2006-074884 A

In the torque motor of Patent Document 1, the length of the iron core relative to the rotor is reduced by arranging the iron core of the coil portion in parallel with the axial direction of the rotor, and the arm portion is shortened to achieve the size reduction of the physique. ing.
As the rotor rotates, the magnetic flux from the coil section and the magnetic flux from the permanent magnet to the stator core increase, so in the latter half of the operating angle range of the rotor, the magnetic saturation of the stator core is promoted and the rotation to the rotor There is a problem that the torque decreases rapidly.
In order to alleviate the magnetic saturation, it is conceivable to expand the magnetic circuit by extending the stator core or the like, but there is a disadvantage that the whole is enlarged and the weight is increased.

  In the torque motor of Patent Document 2, the magnetic path from the coil portion to the rotor is shortened to reduce the overall size and weight. However, as in Patent Document 1, in the latter half of the operating angle range of the rotor. Then, the magnetic saturation of the stator core advances, and the rotational torque to the rotor decreases rapidly.

The present invention has been made in view of the above circumstances, and its object is to suppress the magnetic saturation in the latter half of the operating angle range without increasing the overall size and weight, and to reduce the rotational torque and torque unevenness. It is an object of the present invention to provide a rotary actuator that can ensure a substantially uniform torque characteristic without any vibration.
In the present invention, a one-way rotation type (on / off operation type) that realizes a substantially uniform torque characteristic within a predetermined operating angle range, and a proportional relationship between the current value energized within the predetermined operating angle range and the rotational torque. The unidirectional rotation type (linear operation type) is included.

(About claim 1)
The plurality of coil bodies are arranged at equiangular intervals along the same base circle around the outer periphery of a hollow spindle erected at the center of the plate. The arc-shaped segment core portions are concentrically arranged in the circumferential direction concentric with the base circle at each end portion on the opposite side of the coil body plate.
The plate magnets are arranged in the circumferential direction by the number corresponding to the segment core portions, and have magnetic pole faces whose magnetization direction is perpendicular to the segment core portions. The plate magnet faces the segment core portion in parallel through a minute gap. The magnetization directions of adjacent magnetic pole surfaces are opposite to each other.
The auxiliary magnet is provided between the segment core portions adjacent to each other in the circumferential direction, and the magnetization direction is oriented in the circumferential direction. The magnetization directions of the auxiliary magnets at the positions sandwiching the segment core portion on both sides are opposite to each other. The drive shaft is attached to the central portion of the plate magnet, and supports the plate magnet rotatably with respect to the segment core portion by being inserted through the support shaft. Due to the interaction between the electromagnetic force generated by the magnetic flux generated from the coil body through the segment core portion and the magnetic force generated by the magnetic flux on the magnetic pole surface as the coil body is energized, the plate magnet is moved from the initial position to the segment core portion. Rotate to a stop position by a predetermined circumferential angle.
In the latter half of the rotation of the plate magnet from the initial position to the stop position, the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface are demagnetized by the magnetic flux from the auxiliary magnet.

In the latter half of the rotation of the plate magnet from the initial position to the stop position, the magnetic flux from the auxiliary magnet acts on the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface to demagnetize.
As a result, magnetic saturation is suppressed in the latter half of the rotation of the plate magnet so that the rotational torque does not decrease, and a substantially uniform rotational torque characteristic with no decrease in rotational torque and torque unevenness within a predetermined operating angle range. Can be secured.
In addition, since the auxiliary magnet is a small one provided between the adjacent segment core portions, the whole is not increased in size and is simple and lightweight, which is advantageous in terms of cost.

(About claim 2)
The yoke has a stator portion that is formed in the central portion and is divided into a plurality of portions in the circumferential direction, and a plurality of segment core portions that extend outward from the stator portion. The coil body is provided between the opposing segment core portions of the segment core portions. The rotation shaft is concentrically inserted through the center of the stator portion and is erected perpendicular to the yoke.
The plate magnets are arranged in the circumferential direction by the number corresponding to the segment core portions, and have magnetic pole surfaces whose magnetization direction is perpendicular to the stator portion. The plate magnet faces the outer surface portion of the stator portion via a minute gap, and the magnetizing directions of adjacent magnetic pole surfaces are opposite to each other and rotate integrally with the rotating shaft. The auxiliary magnets are provided between the stator portions partitioned in the circumferential direction, the magnetization direction is directed in the circumferential direction, and the magnetization directions at positions sandwiching the stator portion on both sides are opposite to each other.
As the coil body is energized, an interaction between the electromagnetic force generated by the magnetic flux generated from the coil body through the segment core portion and the magnetic force generated by the magnetic flux on the magnetic pole surface occurs. Accordingly, the plate magnet is rotated by a predetermined circumferential angle from the initial position to the stop position with respect to the stator portion.
In the latter half of the rotation of the plate magnet from the initial position to the stop position, the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface are demagnetized by the magnetic flux from the auxiliary magnet.

  As in the first aspect, in the latter half of the rotation of the plate magnet from the initial position to the stop position, the magnetic flux from the auxiliary magnet acts on the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface and demagnetizes. As a result, magnetic saturation is suppressed in the latter half of the rotation of the plate magnet so that the rotational torque does not decrease, and a substantially uniform rotational torque characteristic with no decrease in rotational torque and torque unevenness within a predetermined operating angle range. Can be secured. Since the auxiliary magnet may be a small one provided between adjacent stator portions, the whole is not increased in size and is simple and lightweight, which is advantageous in terms of cost.

(Claim 3)
The yoke has an annular stator portion formed in the center portion and divided into a plurality of portions in the circumferential direction, and a plurality of segment core portions extending outward from the stator portion. The coil body is provided between the opposing segment core portions of the segment core portions. The rotation shaft is concentrically inserted through the center of the stator portion and is erected perpendicular to the yoke. The annular magnets are arranged in the circumferential direction by the number corresponding to the segment core portions, and have magnetic pole side portions in which the magnetization direction is directed in the radial direction. The outer peripheral side surface of the segment core portion faces the inner peripheral side surface of the stator portion via an annular gap, and the magnetizing directions of adjacent magnetic pole side portions are opposite to each other inward and outward to rotate integrally with the rotating shaft.
The auxiliary magnet is provided between the stator sections partitioned in the circumferential direction, and the magnetization direction is oriented in the circumferential direction. Magnetization directions at positions where the stator portion of the auxiliary magnet is sandwiched between both sides are opposite to each other.
As the coil body is energized, an interaction between the electromagnetic force generated by the magnetic flux generated from the coil body through the segment core portion and the magnetic force generated by the magnetic flux on the magnetic pole side portion occurs. Thus, the annular magnet is rotated from the initial position to the stop position by a predetermined circumferential angle with respect to the stator portion.
In the latter half of the rotation of the annular magnet from the initial position to the stop position, the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface are demagnetized by the magnetic flux from the auxiliary magnet.

  In the latter half of the rotation of the annular magnet from the initial position to the stop position, the magnetic flux from the auxiliary magnet acts on the magnetic flux from the coil body and the magnetic flux from the magnetic pole side and demagnetizes. Since the magnetic saturation is suppressed in the latter half of the rotation of the plate magnet and the rotational torque does not decrease, a substantially uniform rotational torque characteristic with no decrease in rotational torque or torque unevenness is ensured within a predetermined operating angle range. be able to. Since the auxiliary magnet may be a small one provided between adjacent stator portions, the whole is not increased in size and is simple and lightweight, which is advantageous in terms of cost.

(Claims 4 and 5)
The stator portion is a portion corresponding to the magnetic pole switching portion between adjacent magnetic pole surfaces, and forms a narrow portion that increases the magnetic resistance against the magnetic flux. In this case, it can be used as a portion having a large magnetic resistance with a simple configuration in which a narrow portion is formed.

(About claim 6)
Only two segment core portions are extended so as to be symmetrical around the stator portion, and the coil body is wound around the segment core portion.

  In the rotary actuator of the present invention, the magnetic flux from the auxiliary magnet acts on the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface in the latter half of the turning process in which the plate magnet reaches the stop position from the initial position and magnetic saturation is likely to occur. To demagnetize. Thereby, magnetic saturation is suppressed in the latter half of the rotation of the plate magnet, and the rotational torque does not decrease. As a result, it is possible to ensure a substantially uniform rotational torque characteristic with no decrease in rotational torque or torque unevenness within a predetermined operating angle range. Since the auxiliary magnet may be a small one provided between the adjacent segment core portions, the whole is not increased in size and is simple and lightweight, which is advantageous in terms of cost.

  1 to 3 show a first embodiment of the present invention. The rotary actuator 1 in FIG. 1 includes an actuator that opens and closes various valves, a shade that controls light distribution of the low and high of a discharge headlamp, a leveler that adjusts the irradiation direction up and down, and adjusts the irradiation direction left and right It is used for a shift lever locking device of a vehicle (AT vehicle) equipped with AFS and an automatic transmission.

The plate 2 in the rotary actuator 1 is formed of a magnetic material such as iron, and has, for example, a square shape having corner portions 2a (only three portions are shown) having a quadrangular arc shape.
A plurality of, for example, four, cylindrical coil bodies 3 are prepared, and are arranged in a vertical shape with the same height dimension at the corners 2 a of the plate 2 along a predetermined base circle 4. The coil body 3 is mounted on the bobbin 3a while being wound around an iron core 10 as a stator core. Since the iron core 10 is perpendicular to the plate 2, the magnetic poles (N, S) generated in the coil body 3 when energized are perpendicular to the plate 2 as indicated by an arrow V 1 in FIG. Orient.
The coil body 3 is not limited to a cylindrical shape, but may be a polygonal column such as a pentagon, a hexagon, or an octagon, and the shape of the plate 2 is not limited to a square or a polygon, and may be, for example, a circle.

  The arc-side segment core portion 9 is provided corresponding to the number of the coil bodies 3 and is formed of a magnetic material such as iron so as to have a predetermined thickness t and a circumferential angle θ of 90 degrees, for example. . The segment core portions 9 are arranged along sub-circles 4 a that are substantially concentric with the base circle 4 at the end of each coil body 3 opposite to the plate 2. The segment core portions 9 adjacent to each other in the circumferential direction are positioned flush with each other with a slight clearance left and right in the circumferential direction.

  The segment core portion 9 has a central hole portion 9a, and is fixed to the coil body 3 by inserting the iron core 10 into the central hole portion 9a, and curved arm portions 9A, 9B on the left and right sides with the central hole portion 9a as a boundary. Is extended.

In the clearance between the segment core portions 9 adjacent in the circumferential direction, for example, rectangular chip-shaped auxiliary magnets 11 are arranged in the circumferential direction as neodymium magnets.
The auxiliary magnets 11 are magnetized in the circumferential direction along the segment core portion 9, and the auxiliary magnets 11 at positions sandwiching the segment core portion 9 on both sides of the auxiliary magnets 11 are shown by arrows h 1 in FIG. As indicated by h2, the magnetization directions are set to be opposite to each other.

  A hollow support shaft 5 surrounded by the coil body 3 is erected at the center of the plate 2, and the drive shaft 6 is rotatably inserted. One end portion 6a of the drive shaft 6 is fitted into the center portion of the back plate 7, and the other end portion 6b passes through the support shaft 5 and protrudes through the plate 2 so as to be covered with a throttle valve for an internal combustion engine or the like. It is connected to a drive unit (not shown).

  The back plate 7 is urged so as to receive a return turning force in the direction of the initial position H when the back plate 7 is rotated from the initial position H to the stop position L together with a plate magnet 8 to be described later, for example. ing.

A ring-shaped plate magnet 8 is concentrically attached to the back side of the back plate 7. The plate magnet 8 is, for example, a neodymium magnet, and is composed of arcuate magnetic pole surfaces 8a to 8d corresponding to the segment core portion 9 and magnetized to four poles at an angular interval of approximately 90 degrees. The boundary is a magnetic pole switching part M.
The magnetic pole surfaces 8a to 8d are magnetized in a direction along the thickness E perpendicular to the segment core portion 9, and the magnetization direction of the adjacent one of the magnetic pole surfaces 8a to 8d is indicated by an arrow s1 in FIG. , S2 are set to be opposite to each other. The plate magnet 8 is disposed on the outer surface of the segment core portion 9 so as to face in parallel via the minute gap G {see FIG. 1 (b)}.
Note that the plate magnet 8 is not limited to the ring shape, and may be constituted by divided magnet sides such as a combination of a plurality of fan-shaped magnets.

In the above configuration, the plate magnet 8 is attached to the back plate 7 and the segment core portion 9 is opposed to the segment core portion 9 through the minute gap G. Therefore, the coil core 3 is energized from the coil body 3 to the segment core portion 9 with energization. There is an interaction between the electromagnetic force generated by the magnetic flux and the magnetic force generated by the magnetic flux of the magnetic pole surfaces 8a to 8d.
As a result, the plate magnet 8 moves from the initial position H to the stop position L against a biasing force of the return spring, as shown in FIG. 1B, in a predetermined operating angle range α (for example, 0 ° to 90 °). Only in the direction of the arrow W is transmitted to the driven part.
At the initial position H and the stop position L, a stopper (not shown) for holding the position by contacting the plate magnet 8 or the back plate 7 may be provided.

FIG. 2 is a magnetic flux distribution diagram. When the plate magnet 8 rotates from the initial position H to the stop position L, it flows to the back plate 7, the plate magnet 8, the auxiliary magnet 11, the segment core portion 9, the iron core 10, and the plate 2. A magnetic path system is schematically shown.
In the first half rotation process in which the operating angle range of the plate magnet 8 is 0 ° to 45 °, the magnetic flux φ1 of the magnetic pole surfaces 8a and 8d of the plate magnet 8 is a clockwise magnetic circuit M1 as shown in FIG. Form. The magnetic flux φ2 of the auxiliary magnet 11 forms a clockwise magnetic circuit M2, and the magnetic flux φ3 generated by the coil body 3 when energized forms a counterclockwise magnetic circuit M3.

Among the magnetic circuits M1 to M3, in the lower magnetic circuit Ap including the magnetic path of the iron core 10, the coil body 3, and the plate 2, the magnetic flux direction Φp is indicated by an arrow (→) with the direction of the magnetic flux Φp being clockwise, and the magnetic flux direction Φq is A counterclockwise direction is indicated by an arrow (←).
In the lower magnetic circuit Ap, the magnetic fluxes φ1 and φ2 of the magnetic circuits M1 and M2 are demagnetized by the influence of the magnetic flux φ3 of the magnetic circuit M3, so that the magnetic saturation to the segment core portion 9 and the plate 2 is alleviated. . Since the demagnetization in this case is due to the magnetic flux φ3 from the coil body 3, it is irrelevant to the relaxation of magnetic saturation due to the provision of the auxiliary magnet 11.

In the latter half rotation process in which the operating angle range of the plate magnet 8 is 45 ° to 90 °, the magnetic flux φ1 due to the magnetic pole surfaces 8a and 8d of the plate magnet 8 flows counterclockwise in the magnetic circuit M1, and the magnetic flux φ3 due to the coil body 3 is also As shown in FIG. 2B, the magnetic circuit M3 flows counterclockwise.
Since the magnetic flux φ2 of the auxiliary magnet 11 flows in the clockwise magnetic circuit M2, the magnetic fluxes φ1 and φ3 of the magnetic circuits M1 and M3 in the lower magnetic circuit Ap affect the magnetic flux φ2 of the magnetic circuit M2 caused by the auxiliary magnet 11. Demagnetized.
When the coil body 3 is not energized, the magnetic flux from the plate magnet 8 is generated in a direction perpendicular to the segment core portion 9, so that an unintended rotational torque acting on the plate magnet 8 is hardly generated.

In the lower magnetic circuit Ap, in the latter half of the rotation of the plate magnet 8 from the initial position H to the stop position L, the magnetic flux φ2 from the auxiliary magnet 11 is changed to the magnetic flux φ3 from the coil body 3 and the magnetic pole surfaces 8a, 8d ( 8b, 8c) acts on the magnetic flux φ1 to demagnetize.
As a result, magnetic saturation is suppressed in the latter half rotation process of the plate magnet 8, and the rotational torque is prevented from decreasing, and the rotational torque characteristic is substantially uniform without any decrease in rotational torque or torque unevenness within a predetermined operating angle range α. Can be secured.
In addition, since the auxiliary magnet 11 is small in size provided between the adjacent segment core portions 9, the whole is not enlarged, and it is simple and lightweight, which is advantageous in terms of cost.

  Incidentally, FIG. 3A is a graph showing the relationship between the rotation angle of the plate magnet 8 and the magnetic flux amount Φ by the magnetic circuits M1 to M3 in the lower magnetic circuit Ap. In FIG. 3A, the magnetic flux amount Φ of the auxiliary magnet 11 is a parallel straight line y1 parallel to the horizontal axis and belonging to the negative region, and the magnetic flux amount Φ of the plate magnet 8 (magnetic pole surfaces 8a to 8d) is a rotation angle of 45 °. Is a slope line y2 that goes upward and crosses the horizontal axis.

  The magnetic flux amount Φ from the coil body 3 is a parallel straight line y3 that is parallel to the horizontal axis and belongs to the positive region. For this reason, the magnetic flux amount Φ by the magnetic circuits M1 to M3 is changed by an upwardly inclined line y4 (= y1 + y2 + y3) that is the sum of the parallel straight lines y1 and y3 and the inclined line y2 as the plate magnet 8 rotates. I understand.

When the inclined line y4 is a magnetic flux change characteristic, the conventional magnetic flux change characteristic Y without the auxiliary magnet 11 is a position obtained by translating the inclined line y4 in the positive direction by the magnetic flux difference Δy in FIG. That is, in order to generate magnetic saturation by the magnetic circuits M1 to M3, it means that there is a margin corresponding to the magnetic flux amount difference Δy (Y−y4).
For this reason, when the coil body 3 is energized, the rotational torque generated in the plate magnet 8 does not decrease during the latter half rotation process (45 ° to 90 °), as shown in FIG. It can be seen that

  FIG. 4 shows a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the entire rotary actuator 1 is formed in a flat shape. In the second embodiment, parts that are the same as those in the first embodiment are given the same reference numerals, and only different parts will be described. The same code is used in the third and fourth embodiments to be described later.

  The yoke 12 of the rotary actuator 1 constitutes a laminated magnetic plate that is formed by stacking a plurality of thin metal plates 12a such as steel. In the central portion of the yoke 12, annular stator portions 13a, 13b, 13c, and 13d are partitioned and formed at 90 ° angular intervals. The adjacent partition portions of the stator portions 13a, 13b, 13c, and 13d correspond to the magnetic pole switching portion M of the magnetic pole surfaces 8a to 8d in the plate magnet 8. The stator portions 13a to 13d have a plurality of segment core portions 14a to 14d extending outward.

  The segment core portion 14a (14b) and the segment core portion 14c (14d) are symmetrical with respect to the stator portions 13a to 13d. The segment core portions 14a and 14b (14c and 14d) are both symmetrical U-shaped on both the left and right sides, and are juxtaposed so as to form a pair sandwiching the accommodation space (no symbol) in the middle portion.

  In the adjacent partition portions of the stator portions 13a to 13d, groove portions 16 as narrow portions are formed in the circumferential direction at an angular interval of 90 degrees in order to ensure a large magnetic resistance against the magnetic flux. The groove portion 16 has the surface of the adjacent partition portion in the stator portions 13a to 13d filled in the radial direction by notching or the like, and the thickness Th and the upper and lower thicknesses are reduced to leave a thin bridge portion 16B.

  The auxiliary magnet 11 is disposed in the groove 16 by, for example, fitting and fixing. The magnetizing direction of the auxiliary magnet 11 coincides with the circumferential direction of the stator portions 13a to 13d, and the magnetizing directions of the adjacent auxiliary magnets 11 are mutually as shown by arrows h1 and h2 in FIG. The opposite direction. The auxiliary magnet 11 is not limited to being fitted, and may be fixedly disposed in the groove 16 by attachment means such as press fitting, screwing, or adhesive.

The coil body 17 is formed by winding a conductive wire 18 a around an iron core 18, and is arranged in a horizontal type or an inclined type in which the longitudinal direction of the iron core 18 intersects the drive shaft 6.
When the coil body 17 is attached to the yoke 12, the coil body 17 is inserted between the segment core portions 14a and 14b (14c and 14d) by press-fitting the iron core 18 between the segment core portions 14a and 14b (14c and 14d). Each is firmly clamped.

  The plate magnet 8 is a quadrupole type, and the inner diameter D1 is set to be equal to or larger than the inner diameter D2 of the stator portions 13a to 13d. Although the support shaft similar to that of the first embodiment is not shown, the drive shaft 6 is inserted through the support shaft, and the magnetic pole surfaces 8a to 8d of the plate magnet 8 are inserted into the upper surface edge portions of the stator portions 13a to 13d. Through (see FIG. 4B).

In the configuration described above, an interaction between the electromagnetic force generated by the magnetic flux generated from the coil body 17 to the segment core portions 14a to 14d and the magnetic force generated by the magnetic flux of the magnetic pole surfaces 8a to 8d is generated as the coil body 17 is energized.
That is, a magnetic circuit Ni is formed in which the magnetic flux from the left coil body 17 shown in FIG. 4B returns to the coil body 17 via the segment core portion 14a, the magnetic pole surfaces 8d and 8a, and the segment core portion 14b. The magnetic flux from the right coil body 17 forms a magnetic circuit Nj that returns to the coil body 17 via the segment core portion 14d, the magnetic pole surfaces 8b and 8c, and the segment core portion 14c.

  With the formation of the magnetic circuits Ni and Nj, the attracting and repulsive action acts at each part of the stator parts 13a to 13d and the magnetic pole surfaces 8a to 8d of the plate magnet 8, so that the plate magnet 8 rotates in the arrow W direction.

That is, rotational torque acts in the circumferential direction of the plate magnet 8 between the stator portions 13a to 13d and the plate magnet 8, and the plate magnet 8 is moved from the initial position H to the stop position L in a predetermined operating angle range α (for example, 0 It rotates in the direction of arrow W by (° to 90 °).
When the energization to the coil body 17 is stopped, the electromagnetic force of the segment core portions 14a to 14d disappears, and the rotational torque acting between the stator portions 13a to 13d and the plate magnet 8 is eliminated. 8 is returned from the stop position L to the initial position H.

  In Example 2, it arrange | positions in the groove part 16 of stator part 13a-13d so that the magnetization direction of the adjacent thing among the auxiliary magnets 11 may become mutually opposite. Therefore, in the latter half of the rotation of the plate magnet 8 from the initial position H to the stop position L, the magnetic flux from the auxiliary magnet 11 becomes the magnetic flux from the coil body 17 and the magnetic pole surface 8a, as in the first embodiment. It acts on the magnetic flux from 8d (8b, 8c) to demagnetize it.

As a result, magnetic saturation is suppressed in the latter half rotation process of the plate magnet 8, and the rotational torque is prevented from decreasing, and the rotational torque characteristic is substantially uniform without any decrease in rotational torque or torque unevenness within a predetermined operating angle range α. Can be secured.
In addition, since the auxiliary magnet 11 is small in size provided between the adjacent stator portions 13a to 13d, the whole is not enlarged, and a simple and lightweight configuration is advantageous in terms of cost.

  FIG. 5 shows a third embodiment of the present invention. The third embodiment is different from the second embodiment in that instead of the plate magnet 8, a rotating ring 23 having a drive shaft (not shown) attached thereto is rotatably provided in the stator portions 13a to 13d. The annular magnet 24 is provided on the outer peripheral surface. The annular magnet 24 is composed of four pole side portions 24 a to 24 d that are curved in a circular arc shape, and is arranged adjacent to the circumferential direction of the rotating ring 23 as a cylindrical magnet.

Each boundary part of the magnetic pole side parts 24a to 24d is used as a magnetic pole switching part M, and an annular gap Gp having a minute width is formed between each outer peripheral surface of the magnetic pole side parts 24a to 24d and the inner peripheral surface of the stator parts 13a to 13d. Is provided.
The magnetic pole sides 24a to 24d are magnetized in the radial direction along the thickness F, and the magnetization directions of adjacent ones of the magnetic pole sides 24a to 24d are opposite to each other as shown by arrows k1 and k2. It is oriented inward and outward.

As the coil body 17 is energized, an interaction between the electromagnetic force generated by the magnetic flux generated from the coil body 17 to the segment core portions 14a to 14d and the magnetic force generated by the magnetic flux of the magnetic pole side portions 24a to 24d occurs.
That is, the magnetic flux from the left coil body 17 forms a magnetic circuit Np that returns to the coil body 17 via the segment core portion 14a, the magnetic pole side portions 24c and 24d, and the segment core portion 14b. The magnetic flux from the right coil body 17 forms a magnetic circuit Nq that returns to the coil body 17 via the segment core portion 14d, the magnetic pole side portions 24a and 24b, and the segment core portion 14c.

Along with the formation of the magnetic circuits Np and Nq, the attracting and repulsive action acts at each of the stator portions 13a to 13d and the magnetic pole side portions 24a to 24d of the annular magnet 24. It rotates in the W direction.
That is, rotational torque acts in the circumferential direction of the annular magnet 24 between the stator portions 13a to 13d and the annular magnet 24, and the annular magnet 24 is moved together with the rotating ring 23 from the initial position H to the stop position L at a predetermined operating angle. It rotates in the direction of arrow W by a range α (for example, 0 ° to 90 °).

  In the third embodiment in which the rotating ring 23 and the annular magnet 24 are provided in place of the plate magnet 8 of the first embodiment, the magnetic pole faces 8a to 8d of the first embodiment are regarded as the magnetic pole sides 24a to 24d. The same effect as 1 can be obtained.

FIG. 6 shows a fourth embodiment of the present invention. Example 4 differs from Example 3 in that the left coil body 17 and segment core parts 14a and 14b of Example 3 are omitted, and the right coil body 17 and segment core parts 14c and 14d are left. .
The annular magnet 34 provided on the outer peripheral surface of the rotating ring 23 constitutes a pair of magnetic pole side portions 34a and 34b that are curved in a semicircular arc shape. Between the segment core portions 14c and 14d, the left and right groove portions 16 where the auxiliary magnet 11 exists are left to constitute a one-coil / two-pole type (magnet two-pole type). The annular magnet 34 has a predetermined thickness F2, and the magnetization directions of the adjacent magnetic pole sides 34a and 34b are directed inward and outward along the radial direction as indicated by arrows k3 and k4.

  Also in the fourth embodiment, when the rotating ring 23 is in the latter half of the rotation, the magnetic flux of the auxiliary magnet 11 acts to demagnetize by acting on the magnetic fluxes of the coil body 17 and the magnetic pole side portions 34a and 34b. The same effect as 1 can be obtained.

[Modification]
(A) Although four coil bodies were provided in Example 1, two in Examples 2 and 3, and only one in Example 4, the number of installed coil bodies 3 (17) depends on the specifications and installation conditions. It can be changed as desired.
(B) As the plate magnet 8, the auxiliary magnet 11, and the annular magnet 24, in place of the neodymium magnet, KS steel, MK steel, alnico magnet, ferrite magnet, samarium cobalt magnet, and ferrite powder are blended and dispersed using rubber as a binder. A rubber magnet or a magnet in which a magnet and a magnetic material are combined may be used.

(C) When the operating angle range α of the plate magnet 8 is 0 ° to 45 °, the first half rotation process is performed, and when the operating angle range α is 45 ° to 90 °, the second half rotation process is performed. The first half rotation process and the second half rotation process of the plate magnet 8 are changed according to the change of the operating angle range α.
(D) The groove part 16 in Examples 2-4 is formed in the whole thickness direction of the stator parts 13a-13d, cut | disconnects the stator parts 13a-13d into several stator side parts according to the number of magnetic poles, and is adjacent. It is good also as a gap between stator side parts.

  In the rotary actuator of the present invention, the magnetic flux from the auxiliary magnet acts on the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface in the latter half of the turning process in which the plate magnet reaches the stop position from the initial position and magnetic saturation is likely to occur. To demagnetize. Since magnetic saturation is suppressed in the latter half of the rotation of the plate magnet, a uniform rotational torque characteristic with no reduction in rotational torque or uneven torque can be obtained within a predetermined operating angle range. Due to the excellent rotational torque characteristics, it is suitable as a rotary actuator mounted on a vehicle, and can be applied to the machine industry through the distribution of parts by stimulating the demand of the vehicle-related business.

(A) is a disassembled perspective view of a rotary actuator, (b) is a perspective view which shows the state which assembled | attached the rotary actuator (Example 1). (A), (b) is a schematic diagram which shows the magnetic flux distribution of a rotary actuator in the first half process of rotation, and the second half process, respectively (Example 1). (A) is a graph which shows the magnetic flux change characteristic which a magnetic flux changes with rotation of a plate magnet at the time of electricity supply to a coil body, (b) is a graph which shows the rotational torque characteristic of a plate magnet (Example 1). ). (A) is a disassembled perspective view of a rotary actuator, (b) is a perspective view which shows the state which assembled | attached the rotary actuator (Example 2). (Example 3) which is a perspective view of a rotary actuator. (Example 4) which is a perspective view of a rotary actuator.

Explanation of symbols

1 Rotary actuator (rotary solenoid)
2 Plate 3, 17 Coil body 5 Support shaft 6 Drive shaft 8 Plate magnet 8a-8d Magnetic pole surface 9 Segment core part 10, 18 Iron core (stator core)
DESCRIPTION OF SYMBOLS 11 Auxiliary magnet 12 Yoke 13a-13d Stator part 14a-14d Segment core part 16 Groove part (narrow part)
23 Rotating ring 24, 34 Annular magnet 24a-24d Magnetic pole side 34a, 34b Magnetic pole side Ap Lower magnetic circuit M Magnetic pole switching part G Micro gap Gp Annular gap H Initial position L Stop position α Operating angle range Ni, Nj, Np , Nq magnetic circuit

Claims (6)

A plurality of coil bodies disposed at equiangular intervals along the same base circle around the outer periphery of a hollow support shaft erected in the center of the plate;
An arc segment core portion concentric with the base circle and arranged circumferentially at each end of the coil body opposite to the plate;
The magnetic pole surfaces are arranged in the circumferential direction in a number corresponding to the segment core portions, and the magnetizing direction is perpendicular to the segment core portions, and face each other parallel to the segment core portions through a minute gap, adjacent to each other. Plate magnets in which the magnetization directions of the magnetic pole surfaces are opposite to each other;
An auxiliary magnet provided between the segment core portions adjacent to each other in the circumferential direction, the magnetization direction being directed in the circumferential direction, and the magnetization directions at positions sandwiching the segment core portion on both sides are opposite to each other ,
By allowing the drive shaft attached to the central portion of the plate magnet to pass through the support shaft, the plate magnet is supported so as to be rotatable with respect to the segment core portion,
When the coil body is energized, the plate magnet is moved to the segment core portion by the interaction between the electromagnetic force generated by the magnetic flux generated from the coil body via the segment core portion and the magnetic force generated by the magnetic flux of the magnetic pole surface. Is rotated from the initial position to the stop position by a predetermined circumferential angle,
The plate magnet is configured to demagnetize the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface by the magnetic flux from the auxiliary magnet in the latter half of the rotation from the initial position to the stop position. A rotary actuator characterized by that. A yoke having a stator portion formed in the central portion and divided into a plurality in the circumferential direction and a plurality of segment core portions extending outward from the stator portion;
A coil body provided between opposing segment core portions of the segment core portions, a rotating shaft that is concentrically inserted through the center of the stator portion and is erected vertically to the yoke,
The magnetic pole surfaces are arranged in the circumferential direction in the number corresponding to the segment core portions, and the magnetization direction is perpendicular to the stator portion. The magnetic pole faces the outer surface portion of the stator portion through a micro gap and is adjacent thereto. A plate magnet provided so that the magnetization directions of the magnetic pole surfaces are opposite to each other and rotate integrally with the rotating shaft;
An auxiliary magnet that is provided between the stator sections partitioned in the circumferential direction, the magnetization direction is directed in the circumferential direction, and the magnetization directions at positions sandwiching the stator section on both sides are opposite to each other;
Due to the interaction between the electromagnetic force generated by the magnetic flux generated from the coil body through the segment core portion and the magnetic force generated by the magnetic flux of the magnetic pole surface as the coil body is energized, the plate magnet is moved to the stator portion. On the other hand, it is designed to rotate by a predetermined circumferential angle from the initial position to the stop position,
The plate magnet is configured to demagnetize the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface by the magnetic flux from the auxiliary magnet in the latter half of the rotation from the initial position to the stop position. A rotary actuator characterized by that. A yoke having an annular stator portion formed in the central portion and divided into a plurality of portions in the circumferential direction and a plurality of segment core portions extending outward from the stator portion;
A coil body provided between opposing segment core portions of the segment core portions, a rotating shaft that is concentrically inserted through the center of the stator portion and is erected vertically to the yoke,
It is arranged in the circumferential direction with the number corresponding to the segment core part, and has a magnetic pole side part in which the magnetization direction is directed in the radial direction, and the outer peripheral side faces the inner peripheral side of the stator part via an annular gap, An annular magnet provided so that the magnetizing directions of the adjacent magnetic pole side portions are opposite to each other inward and outward and rotate integrally with the rotating shaft;
An auxiliary magnet that is provided between the stator sections partitioned in the circumferential direction, the magnetization direction is directed in the circumferential direction, and the magnetization directions at positions sandwiching the stator section on both sides are opposite to each other;
Due to the interaction between the electromagnetic force generated by the magnetic flux generated from the coil body through the segment core part and the magnetic force generated by the magnetic flux of the magnetic pole side part when the coil body is energized, the annular magnet is moved to the stator part. Is rotated from the initial position to the stop position by a predetermined circumferential angle,
The annular magnet is configured to demagnetize the magnetic flux from the coil body and the magnetic flux from the magnetic pole surface by the magnetic flux from the auxiliary magnet in the latter half of the rotation from the initial position to the stop position. A rotary actuator characterized by that.   3. The rotary actuator according to claim 2, wherein the stator portion is a portion corresponding to a magnetic pole switching portion between the adjacent magnetic pole surfaces, and a narrow portion that increases a magnetic resistance to the magnetic flux is formed. .   4. The rotary according to claim 3, wherein the stator portion is a portion corresponding to a magnetic pole switching portion between the adjacent magnetic pole side portions and forms a narrow portion that increases a magnetic resistance against magnetic flux. Actuator.   4. The rotary according to claim 2, wherein only two of the segment core portions extend in a symmetric state around the stator portion and wind the coil body. 5. Actuator.

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