JP3361013B2 - Rotary electromagnetic actuator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electromagnetic actuator for setting a rotary shaft at a predetermined angle by controlling the duty ratio of pulse waves input to a forward rotating coil and a reverse rotating coil, and more particularly to an automobile. TECHNICAL FIELD The present invention relates to a rotary electromagnetic actuator suitable for use as an electronically controlled throttle valve, an idle speed control valve, etc. of a commercial engine.

[0002]

2. Description of the Related Art Generally, a rotary electromagnetic actuator according to the prior art has a rotating shaft, a magnet provided on the rotating shaft, a core member provided so as to face the magnet, and a winding member provided inside the core member. A magnetic field formed between the magnet and a positive rotation coil that is provided around the magnet and that rotates the rotation shaft in the normal direction by a magnetic field formed between the magnet and the magnet and that is wound around the core member. And a reverse rotation coil that reversely rotates the rotary shaft.

In this type of rotary electromagnetic actuator, a pulse wave that turns on and off at a constant cycle (frequency) is applied to the forward rotation coil and the reverse rotation coil, and the duty ratio of this pulse wave is changed. The rotation angle of the rotary shaft was adjusted.

Further, as the one using the rotary type electromagnetic actuator constructed as described above for the electronically controlled throttle valve, there are disclosed in Japanese Patent Laid-Open Nos. 5-149154 and 4-234.
539, JP-A-4-234540, etc., these electronically controlled throttle valves are configured such that the valve shaft of a throttle valve body is a rotary shaft of a rotary electromagnetic actuator.

In such an electrically controlled throttle valve, when the driver depresses the accelerator pedal, the operation amount is detected by an opening sensor such as a potentiometer on the accelerator side, and the valve opening by the throttle valve body is detected. The throttle valve element is opened and closed by the rotary electromagnetic actuator so that the valve opening degree corresponds to the accelerator operation amount. Further, in the electronically controlled throttle valve, the throttle valve body is provided with feedback control in accordance with the accelerator operation amount based on a throttle sensor such as a potentiometer for detecting the valve opening degree provided on the throttle valve side. The valve opening of is set according to the accelerator operation amount.

The adjustment of the valve opening of the throttle valve body is
This is done by changing the duty ratio of the pulse wave input to the forward rotation coil and the reverse rotation coil of the rotary electromagnetic actuator.

[0007]

In the rotary electromagnetic actuator according to the above-mentioned prior art, a magnet is attached to the valve shaft and a coil is wound around the outer circumference of the magnet, as disclosed in the above-mentioned publications. The core member is fixed to the case side. Therefore, the magnet and the core member must be arranged in the radial direction of the valve shaft, which causes a problem that the rotary electromagnetic actuator becomes large.

Further, when the rotary electromagnetic actuator is used as an electronically controlled throttle valve, an idle speed control valve, etc., each valve becomes large, and each valve is arranged in the engine room, so that the layout is limited. There is a problem that it will end up.

The present invention has been made in view of the above-mentioned problems of the prior art. In the present invention, since the core member around which the coil is wound is arranged in the axial direction of the rotating shaft so as to face the magnet, the size can be reduced. An object of the present invention is to provide a rotary electromagnetic actuator that can be designed.

[0010]

A rotary electromagnetic actuator according to the present invention comprises a rotary shaft rotatably provided in a casing, and a magnet provided in the rotary shaft located in the casing. , before so as to face the said magnet
A core member provided in serial casing, provided wound in the core member, and the forward rotation coil and reverse rotation coil for forward and reverse rotation of said rotary shaft Ri by the magnetic field formed between the magnet Composed of.

In order to solve the above problems,
A feature of the configuration adopted by the invention of claim 1 is that the core member is a first rod-shaped core in which one side is a rod-shaped body around which the forward rotation coil is wound and the other side is a fan-shaped body facing the magnet. , Disposed facing the first rod-shaped core,
A second pole core one side the other side becomes a bar-like body counter-rotating coil is wound became fan body facing the magnet in combination with a fan-shaped body of the rod-shaped core of the first, the second
1, lies in the structure by said plate-like core made provided we circle plate body in the casing so that the second rod-shaped core which is linked with one end of each of the rod-shaped body.

With the above structure, the core member has the first
Since one magnetic path is formed by the rod-shaped core, the second rod-shaped core, and the plate-shaped core, when a pulse wave of a predetermined cycle is input to the forward rotation coil and the reverse rotation coil, the magnetic flux flows in the core member, Different magnetic poles are generated in the fan-shaped body of the first rod-shaped core and the fan-shaped body of the second rod-shaped core that are both end portions of the core member, and a magnetic field is generated between the respective fan-shaped bodies. On the other hand, since the magnetic field is also generated from the magnet provided on the rotating shaft, the magnet attracts and repels by the magnetic field of the magnet and the magnetic field of the fan-shaped body, and the rotating shaft rotates. The magnetic field generated by the positive rotation coil is
One fan-shaped body flows to the other fan-shaped body, and the magnetic field generated by the reverse rotation coil flows from the other fan-shaped body to the one fan-shaped body. Accordingly, by controlling the duty ratio of the pulse wave input to each coil, the strength of the magnetic field generated from one fan-shaped body of the core member and the strength of the magnetic field generated from the other fan-shaped body of the core member can be adjusted, The rotating shaft to which the magnet facing the is fixed can be rotated and held at a predetermined angle.

According to the second aspect of the invention, the magnet is formed in a disk shape by a pair of fan-shaped magnets having different magnetizing directions with respect to the core member.

With the above configuration, in the pair of fan-shaped magnets, a magnetic field is constantly generated from one fan-shaped magnet having the surface of the N pole to the other fan-shaped magnet having the surface of the S-pole, and each fan-shaped magnet of the core member. A magnetic field corresponding to the duty ratio of the pulse wave input to the forward rotation coil and the reverse rotation coil is generated between the bodies. The rotating shaft provided with each fan-shaped magnet is rotated by attraction and repulsion by the magnetic field generated between the fan-shaped bodies of the core member and the magnetic field generated between the fan-shaped magnets. At this time, since the magnet and the fan-shaped body are formed in a fan shape, the magnetic field generated from the magnet is always attracted to the magnetic field generated from one of the fan-shaped bodies or the magnetic field generated between both the fan-shaped bodies. , Can cause repulsion.

[0015] inventions of claim 3, and a rod-like body of the rod-like member and the second rod-shaped core of the first rod-shaped core, to form a semi-cylindrical
It is and configuration.

With the above structure, when the first rod-shaped core and the second rod-shaped core are arranged facing each other, the rod-shaped body becomes a columnar shape with a space therebetween, and is wound around each rod-shaped body. The coils are located in this space, and the space in the core member can be effectively utilized, and each coil is within the circumscribed circle formed by the fan-shaped body of the first rod-shaped core and the fan-shaped body of the second rod-shaped core. Can be accommodated.

According to the invention of claim 4, the first rod-shaped core, the second rod-shaped core and the plate-shaped core constituting the core member are formed of electromagnetic stainless steel.

With the above structure, the eddy current can be reduced, the drive current for generating the magnetic flux in the core member can be reduced, and the response speed can be increased. Further, it is possible to manufacture by cold forging.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

An embodiment according to the present invention is shown in FIGS. 1 to 11, and in this embodiment, an electrically controlled throttle valve using a rotary electromagnetic actuator according to the present invention will be described as an example.

In the figure, reference numeral 1 denotes an intake pipe which serves as an intake passage, and the intake pipe 1 is connected to an intake side (not shown) of an engine body mounted on an automobile.

Reference numeral 2 denotes a throttle valve provided in the middle of the intake pipe 1, the throttle valve 2 constitutes an operating portion of an electronically controlled throttle valve, and the throttle valve 2 changes the flow area in the intake pipe 1. In order to do so, a butterfly type throttle valve body 3 fixed to a rotary shaft 14 described later, and a rotary electromagnetic actuator 11 for opening and closing the throttle valve body 3,
The throttle valve body 3 is generally composed of a throttle sensor 4 including a potentiometer or the like for detecting the valve opening degree of the throttle valve body 3 and outputting the detected opening degree to a control unit 5.

Reference numeral 5 denotes a control unit, which serves as a control unit for an electronically controlled throttle valve, and the control unit 5 is composed of a microcomputer. The throttle sensor 4 and the rotary electromagnetic actuator 11 are provided on the input side. Forward rotation coil 27, which will be described later,
The reverse rotation coil 28 and an opening sensor (not shown) provided on the accelerator pedal side are connected, and the output side is connected to the drive circuit 6 including a pair of transistors 6A and 6B.

Further, the control unit 5 has a built-in program for performing feedback control and the like, and this program includes an opening signal from the throttle sensor 4, a current value input to the forward rotation coil 27 and the reverse rotation coil 28. The control signal output to the transistors 6A and 6B of the drive circuit 6 is calculated based on the
The rotation of the rotary shaft 14 is adjusted by operating the. As a result, the opening degree of the throttle valve body 3 can be set in correspondence with the accelerator operation amount input from the opening sensor on the accelerator pedal side.

A throttle lever 7 is attached to the other end of the rotary shaft 14 and springs 8 and 9 are attached to the throttle lever 7 on one side thereof. The spring 8 acts so that the throttle valve body 3 is in the valve closing position, and the spring 9 acts so that the throttle valve body 3 is in the valve opening position. As a result, the throttle valve body 3 is set to the neutral position by the springs 8 and 9, and the neutral position is a position slightly open from the fully closed position of the throttle valve 2.

Next, the rotary electromagnetic actuator used in this embodiment will be described with reference to FIGS.

In the figure, 11 is a rotary electromagnetic actuator according to this embodiment, and 12 is the rotary electromagnetic actuator 11.
Shows a cylindrical casing having the outer shape of
A rotary shaft support plate 13 having a shaft insertion hole 13A in the middle of 2
Are formed.

Reference numeral 14 is a rotary shaft for rotating the throttle valve body 3, and the rotary shaft 14 is the shaft insertion hole 1 of the rotary shaft support plate 13.
It is rotatably inserted in 3A, a disk-shaped magnet mounting plate 15 is fixed to one side of the rotary shaft 14, and the throttle valve body 3 is fixed to the other side. Further, one side of the rotary shaft 14 is inserted into the casing 12, and the other side thereof is projected from the casing 12 and extended into the intake pipe 1.

Reference numeral 16 denotes a magnet, and the magnet 1
As shown in FIG. 3, 6 includes a pair of fan-shaped magnets 16A and 16B fixed to a disk-shaped magnet mounting plate 15 fixed to one side of the rotary shaft 14. Of the fan-shaped magnets 16A and 16B, the surface of one fan-shaped magnet 16A has an N pole, and the other fan-shaped magnet 1
The surface of 6B serves as an S pole, and is mounted at the end surface on the magnet mounting plate 15. The opening angles of the fan-shaped magnets 16A and 16B are both θ1.

Reference numeral 17 denotes a core member having a substantially columnar shape as a whole. The core member 17 faces the magnet 16 and is located on the axis of the rotary shaft 14 so that the casing 12 can be positioned.
It is provided by being inserted into one side. And the core member 1
7 is a first rod-shaped core 18 and a second rod-shaped core 18 which are arranged facing each other.
A rod-shaped core 21 and a plate-shaped core 24 that connects the first rod-shaped core 18 and the second rod-shaped core 21 to each other, and the first rod-shaped core 18, the second rod-shaped core 21, and the plate-shaped core Core 2
All 4 are made of electromagnetic stainless steel.

Reference numeral 18 denotes a first rod-shaped core, and the first rod-shaped core 18 faces the second rod-shaped core 21 in the longitudinal direction as shown in FIGS. 2, 4 and 5 to 7. And the forward rotation coil 2 is provided on one side.
7 is formed as a semi-cylindrical rod-shaped body 19 wound around a coil bobbin 29, and a flange portion of the rod-shaped body 19 so as to face the magnet 16 on the other side of the rod-shaped body 19. And a fan-shaped body 20 (see FIG. 4). A small diameter semi-cylindrical insertion portion 19A is formed on the tip end side of the rod-shaped body 19, and the other end surface of the fan-shaped body 20 is a magnet facing surface 20A. The opening angle of the magnet facing surface 20A is θ2.

Reference numeral 21 denotes a second rod-shaped core, which is formed in the same manner as the first rod-shaped core 18 described above, and the counter rotating coil 28 is provided on one side with a coil bobbin 30 interposed therebetween. The rod-shaped body 22 wound around the rod-shaped body 22 and the rod-shaped body 2 located on the other side of the rod-shaped body 22 so as to be flush with the fan-shaped body 20 and face the magnet 16.
A fan-shaped body 23 formed as a flange portion of the second (see FIG. 4)
Composed of and. A small diameter semi-cylindrical insertion portion 22A is formed on the tip side of the rod-shaped body 22, and the other end surface of the fan-shaped body 23 is a magnet facing surface 23A. The opening angle of the magnet facing surface 23A is θ2.

Reference numeral 24 denotes a plate-shaped core, and the plate-shaped core 24
As shown in FIGS. 4, 8 and 9, is formed into a disc shape, and the insertion portion 19A of the rod-shaped body 19 is inserted into one of radial positions symmetrical with respect to the center. An insertion hole 25 is formed, and an insertion hole 26 into which the insertion portion 22A of the rod-shaped body 22 is inserted is formed on the other side. Further, the plate-shaped core 24 connects the one end side of the first rod-shaped core 18 and the one end side of the second rod-shaped core 21 so that the first rod-shaped core 18, the second rod-shaped core 21 and The plate-shaped core 24 constitutes the core member 17.

Reference numeral 27 is a forward rotation coil, 28 is a reverse rotation coil, and the forward rotation coil 27 is the coil bobbin 2.
It is wound around the rod-shaped body 20 of the first rod-shaped core 19 via 9 and the counter rotating coil 28 is wound around the rod-shaped body 22 of the second rod-shaped core 21 via the coil bobbin 30. Further, the forward rotation coil 27 operates as a closed coil in the electronically controlled throttle valve device, and the reverse rotation coil 28 operates as an open coil.

Further, the fan-shaped magnets 16A, 16B
The opening angle θ1 of the first rod-shaped core 18, the opening angle θ2 of the magnet facing surface 20A of the first rod-shaped core 18, and the opening angle θ2 of the magnet facing surface 23A of the second rod-shaped core 21 are described below. Device, that is, in the present embodiment, the operating angle α of the throttle valve body 3 and the built-in variation angle β
On the other hand, if the following equation 1 is set, an optimal magnetic field can be generated and the valve opening can be adjusted accurately.

[0036]

[Formula 1] α + β ≦ 180 ° − {(θ2−θ1) +2 (1
80 ° -θ2)}

In this embodiment, α = 83 ° and β = 2
When the angle is 8 °, θ1 = 120 ° and θ2 = 170 ° are set.

Here, the operation of the rotary electromagnetic actuator 11 configured as described above will be described with reference to FIGS. 10 and 11.

First, when a current is input only to the forward rotation coil 27, the magnet facing surface 23A of the second rod-shaped core 21 of the core member 17 has an N pole, and the magnet facing surface 20A of the first rod-shaped core 18 has. The S pole is magnetized to generate a magnetic field from the magnet facing surface 23A toward the magnet facing surface 20A. On the other hand, the fan-shaped magnet 1 of the magnet 16
Between 6A and 16B, a magnetic field is always generated from the N-pole fan magnet 16A toward the S-pole fan magnet 16B. Therefore, as shown in FIG. 10, the fan-shaped magnets 16A and 16B of the magnet 16 are arranged on the facing surface 20 of the core member 17.
When neutral with respect to A and 23A, the facing surface 20
A and the magnetic field generated from 23A and the fan-shaped magnet 16A,
The magnetic field generated by 16B causes the magnet 16 to be attracted and repelled to rotate the rotary shaft 14 in the direction of the arrow (clockwise).

On the other hand, when the current is input only to the reverse rotation coil 28, the second of the core member 17 is reversed, contrary to the above.
S poles are magnetized on the magnet facing surface 23A of the rod-shaped core 21 and N poles are magnetized on the magnet facing surface 20A of the first rod-shaped core 18, and a magnetic field is generated from the magnet facing surface 20A toward the magnet facing surface 23A. . Therefore, as shown in FIG. 11, the magnet 1 is generated by the magnetic fields generated from the facing surfaces 20A and 23A and the magnetic fields generated by the fan-shaped magnets 16A and 16B.
6 causes suction and repulsion to rotate the rotary shaft 14 in the direction of the arrow (counterclockwise).

As described above, the rotary electromagnetic actuator 11 according to this embodiment has a predetermined frequency (for example, 300 Hz).
The signals having the opposite pulse waves are input to the forward rotation coil 27 and the reverse rotation coil 28, respectively. Therefore, when the signal input to the forward rotation coil 27 is ON, it is input to the reverse rotation coil 28. The signal input to the forward rotation coil 27 is OFF, and the signal input to the reverse rotation coil 28 is ON when the signal input to the forward rotation coil 27 is OFF. Accordingly, when the pulse wave input to the forward rotation coil 27 is ON, the rotating shaft 14 is rotated clockwise by the magnetic field generated by the forward rotation coil 27, and when it is OFF, it is rotated by the magnetic field generated by the reverse rotation coil 28. Axis 14
Rotates counterclockwise. However, in reality, the rotation of the rotary shaft 14 cannot be performed by following ON / OFF of the pulse wave, and the rotary shaft 14 is held at the position corresponding to the duty ratio of the pulse wave. It will be.

That is, when the duty ratio of the pulse wave is 50%, the rotation of the rotating shaft 14 shown in FIG. 10 and the rotation of the rotating shaft 14 shown in FIG. 11 cancel each other out, and the rotating shaft 14 is neutral. It is held in the stopped position.

On the other hand, when the duty ratio of the pulse wave is input to the forward rotation coil 27 with the ON state lengthened, the rotation shaft 14 is rotated in the clockwise direction as shown in FIG. It is held in place.

When the duty ratio of the pulse wave is input to the reverse rotation coil 28 with the ON state being lengthened, the rotation shaft 14 rotates in the counterclockwise direction as shown in FIG. Held in place.

Next, the features of the components of the rotary electromagnetic actuator 11 that operates in this manner will be described.

First, in the rotary electromagnetic actuator 11, since the core member 17 facing the magnet 16 is arranged on the axis of the rotary shaft 14, the core member is provided around the magnet like the rotary electromagnetic actuator of the prior art. It is no longer necessary to provide the rotary electromagnetic actuator 1
The radial dimension of 1 can be reduced, and the size can be reduced.

Further, since the core member 17 forms one magnetic path from the three members of the first rod-shaped core 18, the second rod-shaped core 21 and the plate-shaped core 24, the first rod-shaped core is formed. The forward rotation coil 27 is wound around the rod-shaped body 19 of 18
The reverse rotation coil 28 is wound around the rod-shaped body 22 of the rod-shaped core 21. Thereby, the forward rotation coil 27
When a current is input to the counter rotating coil 28 and the counter rotating coil 28, the fan-shaped magnet facing surface 20A and the magnet facing surface 23, which are both ends of the core member 17 and are combined to form the same plane.
Different magnetic poles are generated in A and
A magnetic field can be generated between A and 23A.

Further, since the rod-shaped body 19 around which the forward rotation coil 27 is wound and the rod-shaped body 22 around which the reverse rotation coil 28 is wound are each formed in a semi-cylindrical shape, the rod-shaped bodies 19 and 2 are formed.
2 has a cylindrical shape through a space, and the coils 27 and 28 respectively wound around the rod-shaped bodies 19 and 22 are positioned and wound in this space, so that the space in the core member 17 can be effectively used. The coils 27 and 28 can be wound. Furthermore, the coil 2
Since 7 and 28 are accommodated in the circumscribed circle formed by the fan-shaped bodies 20 and 23, the axial dimension and the radial dimension of the core member 17 can be reduced, and the rotary electromagnetic actuator 11 can be miniaturized. be able to.

Further, the magnet 16 is a pair of fan-shaped magnets 16A, 16B, and the fan-shaped magnets 16A, 1B.
One of the fan-shaped magnets 6B whose surface is the N pole 1
The other fan-shaped magnet 16 whose surface becomes the S pole from 6A
A magnetic field is constantly generated toward B, and a magnetic field corresponding to the duty ratio of the pulse wave input to the positive rotation coil 27 and the reverse rotation coil 28 is generated between the magnet facing surfaces 20A and 23A of the core member 17. . As a result, the rotary shaft 14
Are magnet facing surfaces 20A, 23 of the core member 17.
The magnetic field generated between A and the magnetic field generated between the fan-shaped magnets 16A and 16B can be attracted, repelled, and rotated.

At this time, the fan-shaped magnets 16A, 16
Since B and the fan-shaped bodies 20 and 23 are formed in a fan shape, the magnetic field generated from the magnet 16 is always the magnetic field generated from one of the fan-shaped bodies 20 (23) or the fan-shaped body 2.
It is possible to surely attract and repel the magnetic field generated between 0 and 23 (magnet facing surfaces 20A and 23A).

Further, the first member constituting the core member 17
Rod-shaped core 18, second rod-shaped core 21 and plate-shaped core 2
Since 4 and 4 are made of electromagnetic stainless steel, the eddy current generated in the core member 17 can be reduced, the drive current can be reduced, and the responsiveness of the rotating shaft 14 can be improved. Also,
Electromagnetic stainless steel can be cold forged and the manufacturing cost can be reduced. In this embodiment, although the core member 17 is made of electromagnetic stainless steel, it may be made of silicon steel or electromagnetic soft iron, and a material having electrical characteristics equivalent to those of silicon steel or electromagnetic soft iron (for example, pure iron).
Powder may be used as a sintered alloy.

Thus, in the present embodiment, the rotary electromagnetic actuator 1 configured as described above is used as the electronically controlled throttle valve, so that the rotary electromagnetic actuator 1
In the first embodiment, the core member 17 is arranged on the axis of the rotary shaft 14, and the core member 17 is composed of the first and second rod-shaped cores 18 and 21 and the plate-shaped core 24. Can be reduced to reduce the size of the rotary electromagnetic actuator 11. As a result, the layout when disposing the electrically controlled throttle valve in the engine room can be easily performed, and the maintainability of the electrically controlled throttle valve can be improved.

In the above embodiment, the rotary electromagnetic actuator 11 is used as an electrically controlled throttle valve. However, the present invention is not limited to this and may be used as an idle speed control valve or the like. is there.

[0054]

As has been described above in detail, according to the calling <br/> light according to claim 1, so as to magnet facing provided on the rotary shaft
The core member installed in the casing is rotated forward on one side.
It becomes a rod-shaped body around which the coil is wound and the other side is the magnet.
And a first rod-shaped core that is a fan-shaped body facing
It is placed facing the rod-shaped core and one side is wound with a reverse rotation coil.
It becomes a rotated rod-shaped body and the other side is the fan-shaped body of the first rod-shaped core
Combined with the magnet to form a fan-shaped body facing the
The second rod-shaped core and the first and second rod-shaped cores, respectively.
In the casing so that it is connected at one end side of the rod-shaped body of
And a plate-shaped core made of a disk-shaped body
Therefore, by controlling the duty ratio of the pulse wave input to each coil, the strength of the magnetic field generated from the fan-shaped body of the first rod-shaped core and the magnetic field generated from the fan-shaped body of the second rod-shaped core of the core member are controlled. strength of the can adjust these rod-like co
From the relationship between the magnetic field generated by (a) and the magnetic field generated by the magnet, the rotary shaft can be rotated and held at a predetermined angle.

According to the second aspect of the present invention, since the magnets are formed as a pair of fan-shaped magnets, the magnetic field generated by each of the magnets is always the magnetic field generated by either one of the fan-shaped bodies or between both the fan-shaped bodies. Can be applied to the magnetic field generated at any time, and the rotating shaft can be controlled to be rotated by each magnetic field at all times.

According to the third aspect of the present invention, when the first rod-shaped core and the second rod-shaped core are arranged to face each other, the semi-cylindrical rod-shaped body becomes a columnar shape through a space, and this space is The coils are wound using the coils, and each coil is housed in the circumscribed circle formed by the fan-shaped body of the first rod-shaped core and the fan-shaped body of the second rod-shaped core. Therefore, the rotary electromagnetic actuator can be downsized.

According to the invention of claim 4, the first rod-shaped core, the second rod-shaped core, and the plate-shaped core forming the core member are made of electromagnetic stainless steel, so that the eddy current generated in the core member can be reduced. The response speed can be increased by reducing the drive current for generating the magnetic flux in the core member. Further, it is possible to manufacture by cold forging, and it is possible to reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an electronically controlled throttle valve using a rotary electromagnetic actuator according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the rotary electromagnetic actuator in FIG.

FIG. 3 is a front view showing the shape of a magnet.

FIG. 4 is an exploded perspective view showing a core member according to this embodiment.

FIG. 5 is a front view showing a fan-shaped body of first and second rod-shaped cores forming a core member.

FIG. 6 is a plan view of a first rod-shaped core forming the core member according to the present embodiment.

FIG. 7 is a vertical cross-sectional view taken along the line VII-VII in FIG.

FIG. 8 is a plan view of a plate-shaped core forming the core member according to the present embodiment.

9 is a vertical sectional view as seen from the direction of the arrow IX-IX in FIG.

FIG. 10 is an explanatory diagram showing clockwise rotation of a rotary shaft by a rotary electromagnetic actuator.

FIG. 11 is an explanatory diagram showing rotation of a rotary shaft in a counterclockwise direction by a rotary electromagnetic actuator.

[Explanation of symbols]

11 Rotary electromagnetic actuator 12 casing 14 rotation axis 16 magnets 16A, 16B fan-shaped magnet 17 Core member 18 First rod-shaped core 19,22 Rods 20,23 fan 20A, 23A Magnet facing surface 21 second rod-shaped core 24 Plate-shaped core 27 Forward rotation coil 28 Reverse rotation coil

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiichi Kai 1370 Onna, Atsugi City, Kanagawa Prefecture, Unisia Jecs Co., Ltd. (56) References JP 61-58460 (JP, A) JP 63-87159 ( JP, A) JP-A-6-105523 (JP, A) Actual development Sho 62-11376 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02D 9 / 00-11 / 10 F02D 41/00-45/00 H02K 21/14 H02K 33/00

Claims (4)

(57) [Claims] 1. A a rotary shaft rotatably provided in the casing, a magnet provided on the rotary shaft located within said casing, said Ke so as to face with said magnet
A core member provided in the pacing, provided wound in the core member, the forward rotation coil and reverse to forward and reverse rotation of said rotary shaft Ri by the magnetic field <br/> formed between the magnet In the rotary electromagnetic actuator including a rotating coil, the core member includes a first rod-shaped core having a rod-shaped body on one side around which the positive rotation coil is wound, and a fan-shaped body on the other side facing the magnet, The first rod-shaped core is disposed so as to face the first rod-shaped core, and one side serves as a rod-shaped body around which the counter rotating coil is wound, and the other side serves as a fan-shaped body that is combined with the fan-shaped body of the first rod-shaped core to face the magnet. A second rod-shaped core, and the first and second rod-shaped cores on one end side of each rod-shaped body
In rotary electromagnetic actuator, characterized by being configured by a plate-like core of the disk-shaped body which is provided et the casing so as to connect. 2. The rotary electromagnetic actuator according to claim 1, wherein the magnet is formed in a disk shape by a pair of fan-shaped magnets having different magnetizing directions with respect to the core member. 3. The rod-shaped body of the first rod-shaped core and the rod-shaped body of the second rod-shaped core are formed in a semi-cylindrical shape.
Alternatively, the rotary electromagnetic actuator described in 2. 4. The rotary electromagnetic actuator according to claim 1, wherein the first rod-shaped core, the second rod-shaped core and the plate-shaped core forming the core member are made of electromagnetic stainless steel.