JPH062450Y2 - Rotary Actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric rotary actuator for electrically driving the locking and unlocking knob operation of an automobile door.

(Prior Art) Conventional electric actuators often use an iron core solenoid type in which a magnetic flux generated in a coil is focused on an iron core to form an electromagnet, and the attracting force of the electromagnet actuates a movable iron core. Has been.

This iron-core solenoid type actuator has two operating directions, that is, it is difficult to apply an operating force in the pulling direction and an operating force in the pushing direction. It is difficult to make a small flat structure that can be installed in the door of an automobile, and there is a drawback that the weight becomes heavy.

Therefore, the applicant of the present invention has proposed a coreless rotary actuator in Japanese Patent Application No. 60-26190 in order to solve the above-mentioned drawbacks.

This ironless core type rotary actuator is fixed to a rotatable movable body, has a magnetizing direction in the axial direction of the rotating shaft, and has a flat fan-shaped permanent magnet in the magnetizing direction, and a fixed member that pivotally supports the rotating shaft of the rotatable movable body. A base member and a sheet-shaped planar coil fixedly provided on the plane of the fixed base member orthogonal to the rotation axis so as to face the flat fan-shaped permanent magnet, and having a plurality of conductive wire patterns extending in the radial direction. The flat movable fan-shaped permanent magnet and the electric current flowing in the conductor wire extending in the radial direction of the sheet-shaped planar coil cause the rotatable movable body to rotate in both forward and reverse directions. , About the improvement of this.

(Problems to be Solved by the Present Invention) The rotary actuator according to the present invention can be rotationally driven in both forward and reverse directions. Therefore, when one of the rotational drives is completed, the other is ready to be rotationally driven to the other. In order to prevent overdrive in the same direction, it is necessary to immediately cut off the drive current at the end of drive in order to prevent overdrive.

The present invention provides an iron-free core type rotary actuator made in view of the above problems.

(Means for Solving the Problems) The present invention has a permanent magnet fixed to a rotary movable body, having a magnetization direction in the axial direction of the rotary shaft, and a flat magnet in the magnetization direction, and a rotary shaft of the rotary movable body. A fixed base member that is pivotally supported, and a plurality of conductive wires that are fixedly fixed to the plane perpendicular to the rotation axis of the fixed base member so as to face the permanent magnet and that partially extend in the radial direction are wound in a plane. And a plane coil connected to a power source through a polarity reversing switch, and the rotary movable body is rotated in both forward and reverse directions by electromagnetic action of the permanent magnet and the power source flowing in the plane coil. In the rotary actuator configured as described above, the stroke magnet that cuts off the current to the plane coil in a predetermined direction is generated at a position outside the outer periphery of the permanent magnet in the rotatable movable body by separating the permanent magnet from the body surface. The reed switch for detecting the band is provided such that its longitudinal axis intersects the plane of rotation of the permanent magnet at an angle.

(Operation) The reed switch is operated with high sensitivity by inclining the longitudinal axis of the reed switch with respect to the plan view of rotation of the permanent magnet magnetized in the axial direction and intersecting the central part of the reed switch, Moreover, the axial dimension of the rotary actuator is not increased.

(Embodiment) FIG. 1 shows an embodiment of the present invention. First, the basic structure of a rotary actuator will be described.

(1) is a rotatable movable body, (2a) and (2b) are fan-shaped permanent magnets, (3) is a fixed base member, (4) is a rotating shaft of the rotatable movable body (1), (5) is a plane coil, (6) ) Is a yoke member of the fixed portion.

The rotatably movable body (1) is a yoke member of a rotating part fixed to the rotating shaft (4) having a plane orthogonal to the axis of the rotating shaft (4).
The flat fan-shaped permanent magnets (2a) and (2b) are provided on the plane coil (5) side in the plane portion of the yoke member (7) of the rotating portion.
Are fixed on a diagonal line of 180 degrees.

The fixed base member (3) is composed of a base body (3a) that also functions as a flat casing that houses the mechanism of the rotary actuator inside the hollow, and a lid (3b) that closes the opening inside the hollow.

The rotary shaft (4) of the rotating movable body (1) is attached to the bottom surface (3) of the base body (3a).
By the bearing hole (3d) provided substantially in the center of c) and the boss hole (3e) provided in the lid (3b) corresponding to the bearing hole (3d), the bottom surface (3c)
Is rotatably supported at right angles to the axis and its boss hole (3e)
An output lever (8) is fixed to the output shaft (4a) protruding from the output shaft (4a).

On the inside of the bottom surface (3c) of the base body (3a), a yoke member (6) of a disk-shaped fixed portion is non-rotatably fixed, and the upper surface of the yoke member (6) is similar to printed wiring. A sheet-shaped planar coil (5) made by various techniques is fixed so as not to rotate.

The fan-shaped permanent magnets (2a) and (2b) are, as shown in FIG.
The fan-shaped permanent magnet (2a) on the right side of FIG. 1 is magnetized in the axial direction of (4).
The (7) side is the S pole and the plane coil (5) side is the N pole. The polarity of the other fan-shaped permanent magnet (2b) is opposite to that.

As shown in FIG. 5, the plane coil (5) is provided with a plurality of coil conductors (5a) extending in the radial direction. The coil conductors (5a)
When a current is applied to the coil conductor (5a) and the fan-shaped permanent magnet (2a) (2
During b), electromagnetic interaction works to drive the fan-shaped permanent magnets (2a) (2b) in the forward or reverse direction according to the direction of the current flowing through the coil conductor (5). That is, the rotating movable body (1) is the coil (5)
It rotates normally or reversely depending on the direction of the current.

In the present invention, the stroke end of this rotary movable body (1) is
The fan-shaped permanent magnets (2a) and (2b) are detected at the rotational position of either one of them.

As described above, the rotary actuator according to the present invention can generate and rotate a driving force in either the forward rotation (clockwise direction in FIG. 2) or the reverse rotation (clockwise direction in FIG. 2). The stroke end must be ready to be driven in the other direction.

Therefore, the reed switch (9) (1) operated by the magnetic force of the fan-shaped permanent magnet (2a) is placed outside the peripheral surface of the fan-shaped permanent magnet (2a).
0) is provided.

The reed switches (9), (10) are fixed to the wiring board (11) provided on the same plane as the plane coil (5).

On the wiring board (11), the connection land (11) for fixing the connection lead wires (9a) (9b) and (10a) (10b) of the reed switches (9) (10) is fixed.
a) is provided, and one of the lead wires (9a) and (10a) of the reed switches (9) and (10) in the connection land (11a) is connected to the connection pin (12 ) Is erected.

Reed switch (9) (10) lead wires (9a) (9b), (10a) (10
b), one lead wire (9a) (10a) is connected to the tip of the connection pin (12), the other is connected to the connection land (11a) by shortening the lead wire (9b) (10b) as much as possible, The longitudinal axis of the reed switches (9) (10) fixedly mounted on the wiring board (11) is inclined with respect to the wiring board (11).

The rotating plane of the fan-shaped permanent magnet (2a) is on the side where the reed switches (9) and (10) of the wiring board (11) are mounted, and the rotating plane is
It intersects with the center of the reed switches (9) (10).

That is, the reed switches (9) (10) are composed of fan-shaped permanent magnets (2
It is provided so that the rotation plane of a) and the longitudinal axis intersect diagonally at the center.

Further, as shown in FIG. 2, one of the reed switches (9) and (10) opens the contact at the stroke end of the rotating movable body (1) during the forward rotation or the reverse rotation, and the other surely opens the contact. It is provided so as to be located at both ends of the moving range of the fan-shaped permanent magnet (2a) so as to be closed.

For example, the position of the fan-shaped permanent magnet (2a) shown in FIG. 2 is at the stroke end when it is driven clockwise, and at that position, the reed switch (10) is operated by the magnetic field of the fan-shaped permanent magnet (2a). The contact is closed and the other reed switch
At (9), at the stroke end or a position immediately before reaching the stroke end, the contact escapes from the acting magnetic field of the fan-shaped permanent magnet (2a) to open the contact.

Further, at the stroke end when the fan-shaped permanent magnet (2a) is driven counterclockwise from the position shown in FIG. 2 and is in the position indicated by the phantom line, the fan-shaped permanent magnet (2a) is reed switch (9).
Is surely closed, and at that time, the reed switch (10) is in a position where the contact is opened outside the magnetic field of the fan-shaped permanent magnet (2a).

Thus, at the stroke end (shown by the solid line in FIG. 2) after the rotating body (1) rotates in the clockwise forward direction, as shown in FIG. 6, the reed switch (9) opens and the reed switch (10) opens. ) Is closed. Further, at the stroke end (shown in phantom in FIG. 2) after the rotating body (1) rotates in the counterclockwise reverse direction, the reed switch (9) is closed and the reed switch (10) is opened.

The fan-shaped permanent magnets (2a) (2b) in the iron-free type rotary actuator are, as described above, the axial direction of the rotating shaft (4),
That is, as shown in FIG. 4, the magnet has a magnetization direction in the thickness direction.

In order to open / close (sensitize) the reed switch with the break of the magnet moving in the rotation direction, the magnet rotating in the direction of the magnetic field and about the axis is set in the longitudinal direction of the reed switch. Is provided close to the peripheral surface of the magnet so as to match with.

That is, in the reed switch, the opening / closing operation of the switch is determined by the strength of the magnetic field between the lead wires at both ends in the longitudinal direction of the reed switch. Since the reed switch is not sensitive to the magnetic field of the same level in the lead wire part of, in order to reliably respond to the opening and closing of the magnetic field, both lead wire parts are put in the magnetic field at the same time, It is a normal use form that the reed switch is aligned with the longitudinal direction of the reed switch by taking it out.

However, since the ironless core type rotary actuator is characterized in that it can be configured to be thin and flat in the axial direction of the rotary shaft (4), when the reed switch is used in a normal usage mode as described above, It becomes difficult to reduce the thickness in the longitudinal direction of the direction of the thickness (axial direction).

Therefore, in the present invention, as described above, the reed switches (9) and (10) are tilted with respect to the plane of rotation of the fan-shaped permanent magnets (2a) in the longitudinal axis of the reed switches (9) and (10), so that the rotary actuator of the ironless core type It can be operated without losing its characteristics.

In this case, the fan-shaped permanent magnets (2a) (2b) are
(2a ′) and (2b ′) have a relatively large chord length (L ₁ ), and the chord length (L ₁ ) is such that when the fan-shaped permanent magnet (2a) rotates, the corresponding arc surface (2a ′) ( 2b ') is sufficiently larger than the moving distance (L ₂ ) of the reed switch (9)
Reed switch (9) even if the axis of (10) is tilted
Both connecting lead wires (9a) (9b) and (10a) (10b) of (10) project above and below at least the center of the thickness of the fan-shaped permanent magnets (2a) (2b) (the neutral point of the magnetic field). Thus, the closing operation of the contact can be performed by surely corresponding to the S pole and the N pole of the magnetic field.

However, at the end of the stroke, one of the lead wires (9b) or (10a) is connected to the peripheral surface (2) of the fan-shaped permanent magnets (2a) (2b).
The reed switch (9) or (10) cannot close the contact because it is far away from a ') (2b').

Further, according to the present invention, the fan-shaped permanent magnets (2a) (2b) are magnetized in the axial thickness direction, and the chord length (2a ') (2b') of the moving arc surface (2a ') (2b') of the magnet. L ₁ ) is the reed switch
(9) Reed switch that closes during rotation of fan-shaped permanent magnets (9) and (10) by effectively utilizing the longer length of (10)
The closed state of (9) or (10) is maintained.

Further, by making the connection pin (12) a non-magnetic conductor, the connection lead wires (9a) (10) connected to the connection pin (12)
It is possible to magnetically separate the corresponding magnetic pole (S pole) of a) from the magnetic pole (N pole) on the side of the connection board to perform a reliable operation.

Reed switch (9) (10) connection lead wire (9a) (9b)
(10a) and (10b) are magnetic conductors, and have the function of guiding the magnetic flux to the switching magnetic field of the contact through the lead wire.

However, if the magnetic field of the fan-shaped permanent magnet (2a) is strong enough,
Even if the straight lead wires (9a), (10a) are bent at an appropriate length and connected to the land (11a) without using the connection pin (12), a desired opening / closing operation can be performed.

FIG. 6 shows an example of a control circuit for controlling the rotary actuator using the reed switches (9) and (10).

The open / closed state of the reed switches (9) and (10) in FIG.
When (1) is in the state shown in FIG. 2, the rotating body (1) is
This is a state in which it can rotate only in the reverse direction.

In the figure, (13) is a polarity reversing switch for operating a rotary actuator, (14) is a power supply, (15) is a diode (16) (16) when the reed switch (9) or (10) is closed. Auxiliary relay that operates according to the polarity of the power source through (15a), the coil of the auxiliary relay (15), and (15b) is a contact that closes when the auxiliary relay (15) operates and energizes the planar coil (5). .

When the polarity reversal switch (13) is connected to either one from the neutral position, the direction of the current flowing through the plane coil (5) is the polarity that drives the fan-shaped permanent magnets (2a) (2b) in the forward direction. The direction of connection is defined as forward rotation, and the direction of connection in which the opposite current flows is defined as reverse rotation.

The auxiliary relay (15) operates so that it closes the contact (15b) so that a current flows through the flat coil (5). ) Action is decided.

In the circuit of the coil (15a) of the auxiliary relay (15), a series circuit of a reed switch (9) and a diode (16) for detecting the stroke end in the reverse rotation direction, and a reed switch for detecting the stroke end in the forward rotation direction ( A series circuit of 10) and a diode (16) is connected in parallel with the polarities of the diodes (9) and (10) opposite to each other.

As a result, when the polarity reversing switch (13) is operated, both diodes (16) and (16) detect either one of the applied polarities, and the reed switches (9) and (10) move to the rotating body ( The position of 1) is detected, and at that time, with respect to the stop position of the rotating body (1),
If the polarity of the applied voltage is appropriate in the direction of rotation of the rotating body (1) to be driven next, the auxiliary relay (15) will operate and the power supply
The voltage of (14) is applied to the plane coil (5).

Further, when a current is applied to the planar coil (5) to move the fan-shaped permanent magnets (2a) and (2b) of the rotating pair (1) to the stroke end, the reed switches (9) and (10) open and close each other. Reverse.

When the stroke end is reached from the driving state of the rotating pair (1), the open / close state of the reed switches (9) and (10) is switched, but the diode (16) connected in series to the closed side is
At that time, since the polarity is opposite to the voltage polarity of the power supply (14) that is continuously applied from the polarity reversing switch (13), the auxiliary relay (15) must operate via the closed reed switch. There is no.

As described above, the control circuit of FIG. 6 automatically cuts off the drive current at the stroke end of the rotating body (1) with respect to the rotating direction, and then drives only in the other direction. It makes it possible to pass an electric current.

(Effects of the Invention) As described above, a magnetic field-sensitive section that uses a magnetic field of a fan-shaped permanent magnet having a flat iron core type rotary actuator that is flat in the axial direction of the rotary shaft and has a magnetization direction in the axial direction in the rotary actuator. A relatively long reed switch is installed without increasing the axial dimension of the rotary actuator, and the forward and reverse drive control of the rotary actuator can be performed without overdriving. Provide an actuator.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is a central longitudinal sectional view of a rotary actuator according to the present invention, and FIG. 2 is a plan view showing a part of a lid of the rotary actuator by cutting out. 3, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a schematic view showing the relationship between the fan-shaped permanent magnet and the plane coil. And FIG. 6 is an electric circuit diagram showing an example of rotary actuator control using the reed switch according to the present invention. (1) Rotating movable body, (2a) (2b) Fan-shaped permanent magnet (3) Fixed base member, (4) Rotating shaft (5) Flat coil, (6) (7) Yoke member (8) Output lever, (9 ) (10) Reed switch (11) Wiring board, (12) Connection pin (13) Changeover switch, (14) Power supply (15) Auxiliary relay, (16) Diode

Claims (1)

[Scope of utility model registration request] 1. A permanent magnet fixed to a rotatable movable body, having a magnetization direction in the axial direction of a rotation axis, and flat in the magnetization direction,
A fixed base member that pivotally supports the rotation shaft of the rotatable movable body, and a plurality of fixed base members that are fixedly mounted on a plane orthogonal to the rotation shaft of the fixed base member so as to face the permanent magnets and that partially extend in the radial direction. A conductor is wound in a plane, and a plane coil connected to a power source via a polarity reversing switch is provided, and the rotary movable body is caused by electromagnetic action of the permanent magnet and a current flowing through the plane coil. In a rotary actuator designed to rotate in both the forward and reverse directions, a stroke that cuts off the current in a predetermined direction to the planar coil when the permanent magnet moves away from the facing surface at a position outside the outer periphery of the permanent magnet in the rotating movable body. A rotary switch characterized in that a reed switch for detecting an end is provided such that its longitudinal axis intersects the plane of rotation of the permanent magnet at an angle. -Actuator.