JP2546096B2 - Position detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the rotation of a predetermined movable body such as a throttle position sensor attached to the rotary shaft of a throttle valve of an internal combustion engine and detecting the throttle valve opening from the rotational position of the rotary shaft. Detect position
It relates to the position detecting device for.

[0002]

2. Description of the Related Art Conventionally, as a throttle position sensor for detecting an opening degree of a throttle valve of an internal combustion engine,
For example, a variable resistor type throttle position sensor by contact sliding of a conductive resin resistor disclosed in Japanese Utility Model Laid-Open No. 59-41708 or a magnetic detection method disclosed in Japanese Patent Laid-Open No. 2-298802. A non-contact type throttle position sensor is known.

[0003]

However, since the former variable resistor type throttle position sensor slides the contacts on the conductive resin resistor, the sliding portion is deteriorated with use. However, there is a problem that the durability life is limited.

On the other hand, the latter throttle position sensor based on the magnetic detection method is of a non-contact type and therefore has a very high durability and does not have the problem of a variable resistor type sensor.
Since a signal processing circuit that performs processing such as amplification on the detection signal from the magnetoelectric conversion element is provided, even if an abnormality such as a failure or disconnection of the magnetoelectric conversion element or circuit element occurs in the sensor, nothing happens. Since such a signal is output, failure diagnosis cannot be performed from the output signal, and the throttle valve opening may be erroneously detected. In this case,
If two sensors are used, the failure diagnosis of the sensor can be performed based on the difference in the detection signal from each sensor, but this increases cost and size.

The present invention has been made to solve these problems, and it is a non-contact type throttle position set.
Use a magnetoelectric conversion element such as a sensor to
An object of the present invention is to make it possible to easily detect a sensor failure from the output signal of a position detection device that detects contact .

[0006]

[Means for Solving the Problems] That is, the above-mentioned object is achieved.
The position detecting device according to claim 1 made for the purpose of
A movable body that rolls and a hollow cylindrical shape
So that the central axis of the hollow cylinder matches the rotation axis of the movable body.
The hollow cylinders are arranged from one side to the other side, and
Magnetic flux generating means for generating a bundle, and a hollow circle of the magnetic flux generating means
Provided symmetrically about the rotation axis at the substantially central portion in the cylinder,
The magnitude of the magnetic flux that changes according to the rotation of the movable body
A first and a second magnetoelectric conversion element for detecting each,
The first and second magnetoelectric conversion elements obtained by the
The rotational position of the movable body is detected according to the first and second detection signals.
Characterized by issuing. The position according to claim 2
The detection device detects the opening of the throttle valve of the internal combustion engine.
A position detecting device that is connected to the throttle valve.
A rotor that moves and rotates, and is provided at the tip of the rotor
Together with this, it forms a magnetic path orthogonal to the rotation axis of the rotor.
Hollow cylindrical magnet and substantially central portion in the hollow cylindrical magnet
Are installed symmetrically about the rotation axis, and
First and second magnetoelectric conversion elements for detecting the field direction respectively
And the first and second obtained by the first and second magnetoelectric conversion elements
First and second signal processing times for respectively processing the second detection signal
And a signal by the first and second signal processing circuits.
Of the rotor according to the first and second detection signals after signal processing.
It is characterized by detecting the position.

[0007]

[Operation and effects of the invention] Claims configured as described above
In the position detection device described in 1, a hollow cylindrical shape is formed.
The central axis of the hollow cylinder is
Arranged to match the rolling axis, from one side of the hollow cylinder
A magnetic flux is generated toward the other side. Also, magnetic flux generation means
The first and second magnetoelectric conversion elements are provided at substantially the center of the hollow cylinder.
The child is provided symmetrically about the rotation axis of the movable body,
The magnitude of the magnetic flux that changes according to the rotation of the movable body
To detect. Therefore, in the position detecting device according to claim 1,
If the position detecting device is normal, the first and second magnetic
The first and second detection signals obtained by the electric conversion element are
Each of them corresponds to the rotational position of the movable body, and each of these detections
The signal becomes almost the same signal, and the magnetoelectric conversion element and its signal output
If any abnormality occurs in the system, each detection signal is a different signal
Becomes Therefore, according to the position detecting device of claim 1,
For example, the rotational position of the movable body is detected from the first and second detection signals.
Not only can the first and second detection signals match,
Position detection device failure diagnosis
The disconnection can be performed easily and accurately. Meanwhile, billing
The position detection device according to item 2 is a throttle valve opening degree.
This is a so-called throttle position sensor that detects So
The hollow cylindrical magnet is linked to the throttle valve.
Is installed at the tip of the rotor that rotates
Form orthogonal magnetic paths. Also, inside the hollow cylindrical magnet
The first and second magnetoelectric conversion elements are provided at the substantially central portion of the rotor.
The magnets are formed symmetrically around the rotation axis.
Each magnetic field direction in the magnetic path is detected. And the first,
The second signal processing circuit uses the first and second magnetoelectric conversion elements.
The obtained first and second detection signals are processed respectively. Obey
In the position detecting device according to claim 2, the position detecting device
If the output device is normal, use the first and second signal processing circuits.
The signal-processed first and second detection signals are respectively
Corresponding to the opening of the rottle valve,
Signal becomes almost the same signal, such as magnetoelectric conversion element and signal processing circuit
Some When abnormality occurs, each of these detection signals are different from
Become a signal. Therefore, in the position detecting device according to claim 2,
According to the first and second embodiments, similarly to the position detecting device according to claim 1,
Output signal from the second signal processing circuit (first and second detection
The opening of the throttle valve can be detected based on the signal)
In addition, it is possible to determine whether these detection signals match.
By disconnecting it, the failure diagnosis of the position detection device can be performed easily and easily.
It can be done accurately. Where the rotational position of the movable body
To accurately detect the position and throttle opening, claim 3
As described above, the first and second detection signals are
It changes continuously and gradually according to the position change of the data
It is preferable to configure. And for this,
As described in claim 4, the first and second magnetoelectric conversion elements are
It can be easily realized by using a roll element.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, FIG. 1 is a sectional view showing the internal structure of the throttle position sensor of this embodiment, FIG. 2 is a sectional view taken along the line ABCA in FIG. 1, and FIG. 4 is a sectional view taken along the line D-E-C-A, FIG. 4 is a bottom view of the throttle position sensor, and FIG. 5 is a sectional view taken along the line F-F in FIG.

As shown in FIGS. 1 to 4, the throttle position sensor of this embodiment is made of resin and has a hollow housing 1.
It has. A bearing 3 is embedded in the center of the housing 1, and a hollow rotor 5 made of a magnetic material is rotatably provided in the bearing 3. A lever 7 for receiving the rotation of the throttle valve is fixed to the lower end portion of the rotor 5 shown in FIG. 1, and a coil spring 9 is provided between the lever 7 and the housing 1.

As shown in FIG. 4, hook portions 9a, 9b are formed at both ends of the coil spring 9, and each of the hook portions 9a, 9b is formed with a protrusion 1a formed on the housing 1 and a lever 7, respectively. It is locked in the groove portion 7a formed in. As a result, the coil spring 9 urges the lever 7 and the rotor 5, which rotate in conjunction with the throttle valve, in the throttle valve closing direction (arrow X direction).

On the other hand, a washer 10 is fixedly provided on the outer peripheral portion of the upper end of the rotor 5 in FIG.
And between the outer periphery of the upper end of the bearing 3 in FIG.
A wave-like elastic washer 11 is provided. That is, the washer 11 prevents the play in the Z direction shown in FIG. 1 from occurring.

The inner peripheral portion of the rotor 5 has a concentric cylindrical shape and is magnetized in a direction orthogonal to the rotation axis of the rotor 5 by N.
A permanent magnet 15 made of a rare earth element such as d-Fe-B system is fixed by magnetic force and adhesion. Next, four feedthrough capacitors 17 are electrically connected and fixed by solder or the like above the permanent magnet 15 in FIG.
And a case 20 made of a non-magnetic conductive material around which a mounting hole for the housing 1 is formed. Further, above the case 20, the Hall element 2
1, 22, various circuit elements 23, and four terminals 2
4 is mounted, and a printed circuit board 27 to which a holder 25 accommodating the Hall elements 21 and 22 is fixed is arranged. Then, the case 20 and the printed circuit board 27
Are fixed to the housing 1 with screws 29.

Here, the holder 25 includes the hall elements 21 and 2.
2 for fixing and positioning the printed circuit board 27 on the printed circuit board 27. As shown in FIG.
The latch 25a of the holder 25 presses against the wall of the holder 25 to fix and position it.

As described above, the Hall elements 21 and 22 are
Since the Hall elements 21 and 22 are positioned and fixed to the printed board 27 via the holder 25, the positions of the Hall elements 21 and 22 are the housing 1, the printed board 27, and the holder 25 according to the above configuration.
In this embodiment, the Hall elements 21 and 22 sense the magnetic field orthogonal to the rotation axis of the rotor 5 to obtain detection signals of the same level. The elements 21 and 22 are arranged in the hollow portion of the permanent magnet 15 in parallel with the surface along the rotation axis of the rotor 5 and at positions symmetrical about the rotation axis.

Next, the four connector terminals 32 buried in the connector portion 31 of the housing 1 include the four feedthrough capacitors 17 fixed to the case 20, and the four terminals 24 mounted on the printed circuit board 27. To connect the respective circuit elements 23 mounted on the printed circuit board 27 to operate the circuit elements 23 from the outside and to take out the detection signal obtained by this operation to the outside. Is possible.

A rubber packing 34 is provided in the housing opening 1b above the printed circuit board 27 in FIG. 1, and a magnetic material cover 35 is further provided thereon.
These parts are fixed by caulking the periphery of the housing opening 1b. Printed circuit board 2
The upper part of FIG. 7 in FIG. 1 is filled or coated with a moisture-proof agent 36 such as a Humi-seal so as to protect the inside sealed by the rubber packing 34 from moisture. In addition, as shown in FIGS. 2 and 3, at two locations on the outer side of the housing 1, which are symmetric with respect to the rotation axis of the rotor 5,
A mating mounting portion 1c in which the bush 38 is buried is formed.

In the thus constructed throttle position sensor of this embodiment, the lever 7 is connected to the rotary shaft of the throttle valve, and the rotor 5 rotates with the rotation thereof. Then, along with this rotation, the permanent magnet 15 rotates around the Hall elements 21 and 22.
The magnetic field direction with respect to the magnetically sensitive surfaces of 1 and 22 changes as shown in FIG.

As a result, the output VH from the Hall elements 21 and 22 changes according to the following equation (1): VH = VA.sin.theta. (1) As shown in FIG. 7, the rotor 5 moves from -90 ° to +90. During the rotation to °, it continuously changes on the sine wave from -VA to + VA.

Next, the sensor circuit for operating the Hall elements 21 and 22 which obtain such output characteristics to take out the detection signal is the circuit pattern formed on the printed board 27 and the circuit element 23 mounted on the printed board. And are configured as shown in FIG.

As shown in the drawing, a sensor circuit 50 for the hall element 21 and a sensor circuit 60 for the hall element 22 are independently formed as sensor circuits on the printed circuit board 27, and the four terminals 24 are provided. Among them, the two terminals 24a and 24b are used as the detection signal output terminals from the respective sensor circuits 50 and 60, and the other two terminals 24c and 24d are the power supply terminals, that is, the power supply voltage (Vcc) supply terminals. And a terminal for grounding (Gnd).

The power supply lines from the terminals 24c and 24d serving as the power supply terminals, that is, the Vcc line and the Gnd line, are divided into two before being connected to the circuit elements on the printed board 27, and each of the above-mentioned respective The sensor circuits 50 and 60 are individually supplied with power. In the figure, a capacitor C1 is a capacitor for removing noise on the power supply line.

Next, each of the sensor circuits 50 and 60 is constructed as follows. That is, the sensor circuit 50 for the hall element 21 is composed of the temperature sensitive resistor R1 having positive temperature characteristics and the resistors R2 to R6, and the temperature compensating circuit 51 for generating the reference voltage V11 for driving the hall element 21. , The operational amplifier OP1 and the resistor R7, and the Hall element 2 based on the reference voltage V11 from the temperature compensation circuit 51.
1. A driving circuit 52 for driving 1 with a constant current, an operational amplifier OP2
OP3 and resistors R8 to R10
1. A buffer circuit 53 that passes each output terminal voltage of 1, an operational amplifier OP4, a transistor TR1, and resistors R11 to R11.
R17 and a differential amplifier circuit 54 that differentially amplifies each output terminal voltage that has passed through the buffer circuit 53, an operational amplifier OP5, and resistors R18 and R19. The resistors R18 and R19 control the power supply voltage Vcc. A reference voltage generation circuit 55 that increases the amplified output potential of the differential amplifier circuit 54 by the divided reference voltage V12, and a capacitor C2 and resistors R20 and R21. The amplified output from the differential amplifier circuit 54 is throttled. Detection signal V1 indicating the opening of the valve
The filter circuit 56 outputs the voltage as a voltage across the load resistor RL1 to the outside.

Further, the sensor circuit 60 for the hall element 22 is
Similar to the sensor circuit 50 for the Hall element 21, a temperature compensating circuit 61 including a temperature sensitive resistor R31 having positive temperature characteristics and resistors R32 to R36 for generating a reference voltage V21, an operational amplifier OP11 and a resistor R37. Nari reference voltage V21
Drive circuit 6 for driving the Hall element 22 with a constant current based on
2. Operational amplifiers OP12 and OP13 and resistors R38 to R
A buffer circuit 63 composed of 40 and an operational amplifier OP14
And a differential amplifier circuit 64 including a transistor TR11 and resistors R41 to R47, an operational amplifier OP15 and a resistor R.
48 and R49, which generates a reference voltage V22 to increase the amplified output potential of the differential amplifier circuit 64, and a capacitor C12 and resistors R50 and R5.
1 and the amplified output from the differential amplifier circuit 64 is used as a detection signal V2 (load resistance RL
Filter circuit 66 for outputting to the outside as (voltage across both ends)
It consists of.

As a result, the sensor circuits 50 and 60 output the detection signals V1 and V2 corresponding to the throttle valve opening as shown by the solid lines in FIG. 9, and the throttle signals are output from the detection signals V1 and V2. You can know the valve opening. The detection signals V1 and V shown by solid lines in FIG.
The characteristic of No. 2 is that the magnetic sensitive surface of each Hall element 21, 22 is -30 with respect to the magnetic field direction when the throttle valve opening is 0 degree.
This is the output characteristic when the output is offset, and can be described by the following equation (2).

V1, V2 = K · sin (θ−30) + VM (2) That is, in the present embodiment, by configuring in this way,
Of the sine wave signals shown in FIG. 7 output by the Hall elements 21 and 22, signals in regions that change as linearly as possible can be output as the detection signals V1 and V2. In the equation (2), K is the sensor circuit 50, 6
VM is a constant corresponding to the amplification characteristic of 0, and VM is an offset voltage (V12, V22) by the reference voltage generation circuits 55, 65.
Is.

As described above, in the throttle position sensor of this embodiment, the two hall elements 21 and 22 in the housing 1 and the two hall elements 21 and 22 for operating the hall elements 21 and 22 respectively to output the detection signals. Sensor circuit 5
0 and 60 are incorporated, and two detection signals V1 and V2 corresponding to the throttle valve opening are output.

Therefore, on the side of the control device that performs engine control and the like based on the detection signals V1 and V2 from the throttle position sensor of this embodiment, these detection signals V1 and V are detected.
By comparing the two, it becomes possible to perform a failure diagnosis of the throttle position sensor.

In other words, the failure of the throttle position sensor includes mechanical failure due to a defect in the sensor structure,
It can be roughly divided into electric system failures due to disconnection / short circuit in the sensor circuit, failure of Hall element and circuit element, and mechanical failure can be brought close to 0 by setting a high safety factor. Is. However, it is impossible to reduce the failure rate to 0 because the cause of electrical system failure is defective parts such as Hall elements and circuit elements, defective soldering, etc. The dotted line in Figure 9,
Since there is a case where a detection signal, which is difficult to perform the failure diagnosis, is output as shown in (3), it is not possible to perform the failure diagnosis from the output signal in the conventional throttle position sensor that outputs one detection signal. However, since the throttle position sensor of this embodiment is configured to output the two detection signals V1 and V2 as described above, by comparing the detection signals V1 and V2, the throttle position sensor malfunctions. The diagnosis can be made surely. Therefore, one sensor of this embodiment can have a failure diagnosis function equivalent to two conventional sensors, which contributes to cost reduction and downsizing of the entire system.

Further, in the throttle position sensor of the present embodiment, the power supply lines for taking in power from the outside are set to one Vcc line and one Gnd line by the terminals 24c and 24d, and each line is connected to the printed board 27. Before being connected to the circuit element, it is divided into two so as to supply power to each of the sensor circuits 50 and 60, and the detection signal is a throttle valve opening range to be detected (0 in FIG. 9). In the range of up to 90 degrees), the voltage is always between the lower limit hold voltage larger than 0V and the upper limit hold voltage smaller than the power supply voltage. Therefore, for example, as shown in FIG. 10, compared with a case where two Vcc lines and two Gnd lines for taking in power from a control circuit such as an engine are provided and power is supplied to two sensor circuits, respectively. It is possible to reduce the number of terminals for power supply and reduce the size and cost of the sensor without lowering the failure diagnosis function.

That is, as shown in FIG. 10, Vcc line and G
When there are two nd lines each and any one of the power supply lines is disconnected, the detection signal from the sensor circuit on the side where the disconnection occurs becomes 0 V or a voltage higher than the upper limit hold voltage, and the other sensor Since the detection signal of the voltage corresponding to the throttle valve opening is output, the failure determination can be performed. On the other hand, in the present embodiment, on the power supply line after division (for example, P shown in FIG. 8).
If a disconnection occurs in the power supply lines 1 and P2), the same detection signal as in the case where the number of power supply lines is two is obtained, but on the power supply line before division (for example, P shown in FIG. 8).
When the disconnection occurs in 3), the detection signals from each sensor circuit are both 0V. However, as described above, in the present embodiment, the detection signal is always set to a voltage between the lower limit hold voltage higher than 0V and the upper limit hold voltage lower than the power supply voltage.
Even if V2 is the same, the failure determination can be performed depending on whether the value is 0V or higher than the upper limit hold voltage. Therefore, as compared with the case where two power supply lines are provided for each sensor circuit as shown in FIG. 10, the number of power supply terminals can be reduced without lowering the failure diagnosis function.

Further, for example, as shown in FIG. 11, when the power supply line (Vcc line in the figure) is divided by the line L after passing through the circuit elements, it is on the power supply line before division (P4 in the figure). When the disconnection occurs at the point), the sensor circuits 50 and 60 output detection signals V1 and V2 as shown by the dotted lines in FIG. 9, and in this case, failure diagnosis cannot be performed. Then, as described above, since the power supply lines to the sensor circuits 50 and 60 are divided before the circuit elements are passed through, it is possible to reliably perform the failure diagnosis without such a problem.

Further, in this embodiment, since the concentric cylindrical permanent magnet 15 is used as the magnet forming the magnetic path for detecting the opening, the magnetic field strength for detection is smaller than that of the conventional device with a smaller magnet. Can be ensured and the assembling process can be simplified. In other words, as shown in FIG. 12, in the conventional magnetic detection type throttle position sensor, from the facing surface 71a of one magnet 71, which is arranged to face the rotary shaft of the rotor 70, to the facing surface 72a of the other magnet 72. The magnetic path for detecting the opening degree is formed by forming the magnetic path with the rotor. However, in this method, it is necessary to enlarge the rotor 70 in order to obtain the required magnetic field strength at the rotation center position of the rotor 70. In addition, the assembling process also requires a great number of man-hours in order to precisely face the two magnets 71 and 72. However, in this embodiment, since the concentric cylindrical permanent magnet 15 magnetized in the direction orthogonal to the rotor rotation axis is fixed to the rotor 5, the magnetic field at the rotor rotation center position is the same as that of the conventional device, with the same rotor size. The strength can be increased by 15%, the rotor 5 can be downsized, and the assembling is simple because only one magnet needs to be fixed.

Further, in this embodiment, the Hall elements 21 and 22 are used as the magnetoelectric conversion elements, and the Hall elements 21 and 22 are
Since the hall elements 21 and 22 are arranged in parallel to the surface along the rotation axis of the rotor 5 and symmetrically with respect to the rotation axis.
The magnetic field strengths applied to the respective magnetic sensitive surfaces can be always made equal. Therefore, the detection signals V1 and V2 output from the sensor circuits 50 and 60 can be equalized, and the failure diagnosis can be performed with high accuracy.

Next, in the embodiment, the permanent magnet 15 has N
A permanent magnet made of a rare earth element such as d-Fe-B is used. This is because the permanent magnet made of a rare earth element can obtain a large magnetic field strength. Therefore, the throttle position sensor can be reduced in size and weight.

Further, in this embodiment, since the terminal 24 of the printed circuit board 27 and the feedthrough capacitor 17 are connected by the connector terminal 32, the feedthrough capacitor 17 blocks noise that enters from the connector terminal 32, and the throttle valve The detection accuracy of the opening can be improved.

Furthermore, in the present embodiment, the Hall element 21,
Since the holder 22 is housed in the holder 25 and fixed to the printed circuit board 27, the Hall elements 21 and 22 can be easily positioned. Further, the holder 25 allows the Hall element 21 due to temperature / vibration stress due to long-term use. Since it is possible to prevent the leads of the lead wires 22 and 22 from twisting in the shaft rotation direction, the durability of the throttle position sensor can be ensured.

Further, in this embodiment, since the rotor 5 is fixed to the housing 1 via the bearing 3, the rotor 5
It is possible to reduce the amount of play in the rotation direction by the bearing 3, and it is possible to reduce the fluctuation in the detection characteristics due to the clogging of the rotor 5 caused by some external force applied to the lever 7.

[0038]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an internal configuration of a throttle position sensor of an embodiment.

FIG. 2 is a cross-sectional view taken along the line ABCA in FIG.

3 is a cross-sectional view taken along the line DECA in FIG.

FIG. 4 is a bottom view of a throttle position sensor.

5 is a cross-sectional view taken along line FF in FIG.

FIG. 6 is an explanatory diagram for explaining the arrangement of the hall elements 21, 22 and the permanent magnet 15 and the detection operation of the throttle valve opening degree by the hall elements 21, 22.

FIG. 7 is a diagram showing output signal characteristics of Hall elements 21 and 22.

FIG. 8 is an electric circuit diagram showing a configuration of a sensor circuit.

9 is a diagram showing a detection signal characteristic obtained by the sensor circuit of FIG.

FIG. 10 is an explanatory diagram illustrating another connection example of the power supply line to the sensor circuit.

11 is an electric circuit diagram showing a configuration of a sensor circuit in which a division position of a power supply line is changed with respect to the sensor circuit of FIG.

FIG. 12 is an explanatory diagram illustrating an assembled state of an opening degree detection magnet in a conventional throttle position sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing 5 ... Rotor 15 ... Permanent magnet 17 ... Feedthrough capacitor 20 ... Case 21,22
... Hall element 24 ... Terminal 25 ... Holder 27 ... Printed circuit board 32 ... Connector terminal 35 ... Cover 50,
60 ... Sensor circuit 51, 61 ... Temperature compensation circuit 52, 62 ... Drive circuit 53, 63 ... Buffer circuit 54, 64 ... Differential amplification circuit 55, 65 ... Reference voltage generation circuit 56, 66 ... Filter circuit

Continuation of the front page (56) Reference JP-A-1-119701 (JP, A) Actual opening 1-148808 (JP, U) Actual opening 1-148807 (JP, U) Actual opening Sho 63-115713 (JP , U)

Claims (4)

(57) [Claims] 1. A movable body which rotates and a hollow cylinder, and the central axis of the hollow cylinder is
The hollow is arranged so as to match the rotation axis of the movable body.
Magnetic flux that generates magnetic flux from one side of the cylinder to the other
The generating means and the rotating shaft at the substantially central portion in the hollow cylinder of the magnetic flux generating means.
Centered symmetrically, changes according to the rotation of the movable body
To detect the magnitude of the magnetic flux
And a magnetoelectric conversion element, which is obtained by the first and second magnetoelectric conversion elements.
The rotational position of the movable body is determined according to the first and second detection signals.
A position detection device characterized by detecting. 2. An opening degree of a throttle valve of an internal combustion engine is detected.
And a rotor that rotates in conjunction with the throttle valve and a rotor that is provided at the tip of the rotor and that rotates the rotor.
A hollow-cylindrical magnet forming a magnetic path orthogonal to the axis, and a center of the hollow-cylindrical magnet around the rotation axis.
It is provided symmetrically and detects each magnetic field direction in the magnetic path.
First and second magnetoelectric conversion elements, and the first and second magnetoelectric conversion elements obtained by the first and second magnetoelectric conversion elements.
First and second signal processing circuits for processing the respective detection signals
And signal processing by the first and second signal processing circuits
The position of the rotor is determined according to the subsequent first and second detection signals.
A position detection device characterized by detecting. 3. The first and second detection signals are the movable
Changes gradually and continuously in response to changes in body or rotor position
The position according to claim 1 or 2, characterized in that
Position detection device. 4. The first and second magnetoelectric conversion elements are ho
Position detector according to claim 3, characterized in that
Output device.