JP4367473B2 - Rotation angle detector - Google Patents

Description

  The present invention relates to a rotation angle detection device in which a non-contact type magnetic detection element for detecting the rotation angle of an object to be detected is arranged facing a magnet provided on a rotor core. The present invention relates to a rotation angle detection device including a non-contact type magnetic detection element such as a Hall element to be detected or a Hall IC.

  Conventionally, as a throttle position sensor for detecting a rotation angle of a rotary valve such as a throttle valve, there is a structure disclosed in Japanese Patent Laid-Open Nos. 62-182449 and 2-130403. First, in the throttle position sensor disclosed in Japanese Patent Application Laid-Open No. 62-182449, an insulating substrate having a variable resistor portion is fixed to the tip of a throttle valve shaft, and is integrated with the shaft as the throttle valve shaft rotates. And rotating to contact with a fixed terminal fixed to the sensor case side to output to the outside (first conventional example).

Further, the throttle position sensor disclosed in Japanese Patent Laid-Open No. 2-130403 is integrated with a throttle valve shaft by fixing a permanent magnet, which is a magnetic field generation source, and a yoke to a tip of a throttle valve shaft via a holding member. The Hall element for detecting the rotation angle of the throttle valve shaft and the signal processing circuit unit are arranged on the substrate, connected to the connector via the lead frame, and output to the outside (first) 2 Conventional example).
JP 62-182449 A Japanese Patent Laid-Open No. 2-130403

  However, on the sensor case side of the throttle position sensor of the first conventional example, an input / output connector pin arranged by resin integral molding and a fixed terminal fixed by some mechanical means after resin molding are provided. However, it does not have a specially devised configuration on the sensor case side for assembly with the insulating substrate. As a result, there is a problem in that the positional relationship between the fixed terminal on the sensor case side and the insulating substrate that rotates integrally with the shaft of the throttle valve is easily displaced, and the detection accuracy of the opening degree of the throttle valve is lowered.

  On the other hand, in the throttle position sensor of the second conventional example, electric parts such as a substrate, a lead frame, and a connector are modularized by integral molding with a resin and fixed to the throttle body with screws. At this time, machining is performed on the throttle body side in order to increase the mounting accuracy of the module housing portion. In such assembly, there is a problem that the thrust backlash of the shaft of the throttle valve remains, and there is a problem that processing accuracy and processing man-hours prior to assembly of various parts are required.

  Here, a rotation angle detection device that detects a rotation angle of an object to be detected using a magnetic detection element such as a Hall element and a permanent magnet is known. In order to increase the efficiency of the magnetic circuit for the stator core which is a component of this rotation angle detection device, the stator core is divided into two parts in order to magnetically cut off between the stator cores and to regulate a magnetic detection gap having a certain width. The stator cores are fixed by resin spacers or fixed by resin insert molding.

  In addition, in order to connect (fix) the stator core and other components, it is necessary to form a portion that is unnecessary on the magnetic circuit with a magnetic material (the same material as the magnetic circuit portion). With these stator core structures, the number of parts increases and costs increase, and it is difficult to ensure high positional accuracy (air gap, etc.) between the stator cores and the rotor core, which are important in the magnetic circuit. There is a problem that the efficiency of the magnetic circuit is reduced.

  An object of the present invention is to provide a rotation angle detection device capable of preventing the positional relationship between two magnets and a magnetic detection element from being shifted and improving the detection accuracy of the rotation angle of an object to be detected. It is another object of the present invention to provide a rotation angle detection device that can simplify the assembly of a magnetic detection element and an external connection terminal. Furthermore, the rotation angle detection which can solve the said problem is comprised by laminating | stacking or sintering or forging the material from which a magnetic material and a nonmagnetic material differ in the 1st and 2nd stator core part divided into two. To provide an apparatus.

  According to the first aspect of the present invention, the non-contact magnetic detection element and the first resin molded product that holds the external connection terminal integrally by resin molding and the stator core that concentrates the magnetic flux to the magnetic detection element are provided. By integrating and holding by resin molding, it is possible to secure the arrangement positions of the constituent elements such as the resin detection element, the stator core, and the external connection terminals in a lightweight, easy to manufacture and inexpensive resin molded product. As a result, when the resin molded product holding and fixing the sensor unit including the magnetic detection element is assembled to the detected object, it is disposed opposite to the rotation center of the rotor core that rotates as the detected object rotates. Since the gap between the two magnets magnetized in opposite directions and the magnetic detection element of the resin molded product can be ensured with high accuracy, the detection accuracy of the rotation angle of the object to be detected can be improved. .

  According to the second aspect of the present invention, the primary molding step of integrating the connecting portions of the magnetic detection element and the external connection terminal by resin molding is performed, the assembly step of assembling the stator core to the magnetic detection element is performed, and the magnetic A secondary molding step of integrating the detection element, the stator core, and the external connection terminal by resin molding is performed, and the magnetic detection element and the like are integrally arranged and configured in the resin molded product. As a result, in each molding process of the primary molding process and the secondary molding process, heat and force during resin molding and assembly are not applied to the magnetic detection element, and the arrangement position of the magnetic detection element is highly accurate. By securing, when the resin molded product is assembled to the object to be detected, it is arranged opposite to the rotation center of the rotor core that rotates with the rotation of the object to be detected and magnetized in the opposite directions. A gap between the two magnets and the magnetic detection element of the resin molded product can be easily secured, and the positional accuracy between the magnetic detection element and the two magnets can be maintained.

According to the invention described in claim 3, the stator core, a first stator core formed by stacking a plurality or sintering or forging the magnetic material in the thickness direction, and also the magnetic material plate thickness direction and the first stator core section Are provided with a second stator core portion formed by laminating, sintering or forging. Then, the stator core is made of a nonmagnetic material that joins the end portions of the first and second stator core portions so that the first and second stator core portions form a magnetic detection gap having a constant width, so that The width of the magnetic detection gap formed between the first and second stator core portions can be regulated without using a resin spacer. Therefore, the stator core constituting the magnetic circuit is composed of one part by combining the magnetic material and the non-magnetic material, so that the cost can be reduced by reducing the number of parts, and the first and second stator core parts divided into two parts. It is easy to secure the positional accuracy between them, and the efficiency of the magnetic circuit can be improved.

According to the fourth aspect of the present invention, the first and second stator core parts divided into two so as to form a magnetic detection gap having a constant width are formed of a magnetic material at the part constituting the magnetic circuit, By forming the portion with a nonmagnetic material, the efficiency of the magnetic circuit can be improved.
In addition, according to the invention described in claim 5, since the resin integral molding is performed at a molding pressure lower than the injection molding at the time of the secondary molding in the primary molding process, the injection molding at the time of the secondary molding process. Primary molding that can withstand this can be performed.

[Example 1]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIGS. 1 to 7 show a first embodiment of the present invention, FIG. 1 is a diagram showing a main configuration of a rotation angle detection device, and FIG. 2 is a diagram showing an intake control device for an internal combustion engine. 3 and 4 show the sensor cover.

  An intake control device for an internal combustion engine according to the present embodiment is supported by a throttle body (corresponding to a housing of the present invention) 1 that forms an intake passage to the internal combustion engine (engine), and is rotatably supported in the throttle body 1. A throttle valve (throttle valve) 2, a throttle valve shaft (hereinafter abbreviated as a shaft) 3 that is a shaft portion of the throttle valve 2, an actuator 4 that rotationally drives the shaft 3, and an engine control that electronically controls the actuator 4 And an apparatus (hereinafter referred to as ECU).

  The intake control device for an internal combustion engine controls the rotational speed of the engine by controlling the amount of intake air flowing into the engine based on whether or not an accelerator pedal (not shown) of the automobile is depressed. The ECU is connected to an accelerator opening sensor that converts the amount of depression of the accelerator pedal into an electrical signal (accelerator opening signal) and outputs how much the accelerator pedal is depressed to the ECU. The internal combustion engine intake control device also includes a rotation angle detection device 5 that converts the opening of the throttle valve 2 into an electrical signal (throttle opening signal) and outputs how much the throttle valve 2 is open to the ECU. ing.

  The throttle body 1 is an apparatus main body housing that is made of aluminum die casting and accommodates and holds the throttle valve 2. The throttle body 1 is fixed to an intake manifold of the engine using a fastener such as a bolt. The throttle body 1 has a bearing holder 12 that rotatably supports one end portion of the shaft 3 via a ball bearing (rolling ball bearing: corresponding to the bearing portion of the present invention) 11, and the other end portion of the shaft 3. It has a bearing holder 14 rotatably supported via a thrust bearing (plane metal bearing: corresponding to the bearing portion of the present invention) 13 and a motor housing portion 15 for housing the motor 9.

  The throttle valve 2 corresponds to an object to be detected (rotating body) of the present invention, and is a butterfly type rotary valve that controls the amount of air sucked into the engine. A fastener such as a screw is used on the outer periphery of the shaft 3. Is fixed. The throttle valve 2 of the present embodiment is formed in a substantially disc shape.

  The shaft 3 corresponds to a shaft portion of an object to be detected (rotating body). A rotor core 17 in which a resin gear 16 is insert-molded is fixed to one end of the shaft 3 by means such as caulking. A coil-shaped return spring 19 is mounted on the outer periphery of the rotor core 17 to return the throttle valve 2 and its shaft 3 to the initial position when the engine is at idle rotational speed.

  The actuator 4 includes a motor 9 electronically controlled by the ECU, a pinion gear 20 fixed to the outer periphery of the output shaft of the motor 9, an intermediate reduction gear 21 that rotates in mesh with the pinion gear 20, and the intermediate reduction gear 21. This is a detected object driving means that has the above-described resin gear 16 that meshes and rotates, and that rotationally drives the throttle valve 2 and its shaft 3.

  The motor 9 is embedded in the sensor cover 7 and is positioned and held. The motor energization terminal 22 is integrally connected to the motor energization terminal 22 and is connected to the motor energization terminal 22 so as to protrude from the sensor cover 7 toward the motor 9. And a drive source that is energized and operated via a motor power supply terminal 24 that is detachably connected to the motor connection terminal 23. The pinion gear 20 is a cylindrical worm that is integrally formed of resin, is detachably fixed to the output shaft of the motor 9, and rotates integrally with the output shaft.

  The intermediate reduction gear 21 is integrally formed of resin, is rotatably fitted to the outer periphery of a fixed shaft 25 that forms the center of rotation, and has a large-diameter gear 26 that is integrally provided on the outer periphery of one end portion, and the other end portion. It is composed of a small-diameter gear 27 and the like provided integrally on the outer periphery. The large diameter gear 26 is a cylindrical worm wheel.

  The rotation angle detection device 5 is a so-called throttle position sensor, which is a cylindrical permanent magnet (two magnets) 6 that is a magnetic field generation source disposed on the inner peripheral surface of the rotor core 17 and a resin molded product (sensor cover) 7 side. And two lead ICs (multiple terminals) 33 made of a conductive metal thin plate for electrically connecting the hall ICs 31 and 32 to an external ECU; The stator core 34 is divided into two parts made of an iron-based metal (magnetic material) that concentrates the magnetic flux to the two Hall ICs 31 and 32.

  The permanent magnet 6 corresponds to the two magnets of the present invention, and adhesive or the like is applied to the inner peripheral surface of a rotor core 17 made of an iron-based metal (magnetic material) that rotates integrally with the throttle valve 2 and its shaft 3. It is a component that is fixed using a resin or is fixed to a resin and an integral mold to give a magnetic flux to the magnetic circuit of the rotation angle detection device 5. The permanent magnet 6 of this embodiment has a semi-arc-shaped magnet portion whose magnetization direction is the radial direction (N pole on the inner circumferential side and S pole on the outer circumferential side), and the radial direction (the inner circumferential side is the S pole and the outer circumferential side). And a magnet portion having a semicircular arc shape with N poles on the side. The rotor core 17 is provided with a positioning hole 18 for attaching to the idle ring position with respect to the shaft 3.

  The two Hall ICs 31 and 32 correspond to the non-contact type magnetic detection element of the present invention, and are arranged to face the inner peripheral side of the permanent magnet 6, and an N-pole or S-pole magnetic field is present on the sensitive surface. When generated, an electromotive force is generated in response to the magnetic field (a positive potential is generated when an N pole magnetic field is generated, and a negative potential is generated when an S pole magnetic field is generated). In this embodiment, as shown in FIGS. 5 and 6, the two Hall ICs 31 and 32 are arranged in parallel in the opposite direction by 180 degrees.

  As shown in FIGS. 5 and 6, the lead frame 33 is embedded and held in the connect holder 35 and the sensor cover 7, and is made of a conductive metal (copper plate or the like) for signal input (VDD). The terminal 40 includes two signal output (OUT1, OUT2) terminals 41 and 42, a ground (GND) terminal 43, and the like. The signal input terminal 40 is a conductive plate that applies a power supply voltage (for example, a battery voltage of 5 V) to the two Hall ICs 61 and 62, respectively.

  The signal output terminals 41 and 42 correspond to the external connection terminals of the present invention, and are used for taking out the outputs of the two Hall ICs 31 and 32, that is, the throttle valve 2 opening (throttle opening) signals. It is a conductive plate. The signal input terminal 40, the signal output terminals 41 and 42, and the grounding terminal 43 have a plurality of connecting pieces 44 and 45 so that the distance between the terminals is kept at a predetermined interval. 44 and 45 are cut before the secondary molding. In addition, the connection part of the lead wires (lead wires) 36 and 37 of the two Hall ICs 31 and 32 and the lead frame 33 is a connect holder (first resin molded product: primary molded product) made of a thermoplastic resin such as PBT. 35).

  A constant width magnetic detection gap for forming a parallel magnetic field is formed in the central portion of the stator core 34 so as to penetrate in the diameter direction. Specifically, the stator core 34 forms a fixed width magnetic detection gap. And the width of the magnetic detection gap is regulated by the connect holder 35, and two Hall ICs 31 and 32 are arranged in the magnetic detection gap.

  The two divided stator cores 34 are fitted and fixed to the outer periphery of the connect holder 35. The stator core 34 is provided with a groove portion 38 for securing a clearance of, for example, 0.2 mm between the two Hall ICs 31 and 32 and a fitting portion 39 that is fitted to the outer periphery of the connect holder 35. . The connect holder 35 constitutes a resin spacer for forming the width of the magnetic detection gap between the stator cores 34 divided into two.

  As shown in FIG. 2, the sensor cover 7 closes the opening side of the throttle body 1, is lightweight, easy to manufacture and inexpensive, and electrically insulates each terminal of the rotation angle detection device 5. A resin molded product (second resin molded product: secondary molded product) made of this thermoplastic resin is employed. The sensor cover 7 has a concave portion 47 fitted to a convex portion 46 provided on the opening side of the throttle body 1 and is assembled to the throttle body 1 by fastening with a clip (not shown).

  Therefore, by assembling the throttle body 1 and the sensor cover 7 so that the convex portion 46 and the concave portion 47 are fitted, the two Hall ICs 31 and 32 arranged and fixed on the sensor cover 7 side and the throttle body 1 are assembled. The positional relationship with the permanent magnet 6 arranged and fixed on the inner periphery of the rotor core 17 that rotates integrally with the shaft 3 that is rotatably supported can be eliminated.

  A connector 49 is integrally provided on the side surface of the sensor cover 7. The connector 49 includes an insulating resin connector shell 50 integrally formed on the side surface of the sensor cover 7, signal input terminals 40 of the lead frame 33, signal output terminals 41 and 42, and tips of the ground terminals 43 (connectors). 51 to 54 constituting the pins) and tip portions (constituting connector pins) 55 and 56 of the motor energization terminal 22 of the motor 9.

[Assembly method of the first embodiment]
Next, a method of assembling the rotation angle detection device 5 of this embodiment will be briefly described with reference to FIGS. Here, FIG. 5 is a diagram showing two Hall ICs and a lead frame, FIG. 6 is a diagram showing a connection portion between the two Hall ICs and the lead frame, and FIG. FIG. 7B is a view showing a primary resin molded product, and FIG. 7C is a view showing a stator core.

  A lead frame 33 having a predetermined shape is formed by press-molding a conductive metal thin plate. As shown in FIGS. 5 and 7A, the lead wires 36 and 37 of the two Hall ICs 31 and 32, the signal input terminal 40, the signal output terminals 41 and 42, and the ground terminal 43 are connected. Connect electrically.

  Then, as shown in FIG. 7B, an electrical wiring component comprising the lead wires 36 and 37 of the two Hall ICs 31 and 32, the signal input terminal 40, the signal output terminals 41 and 42, and the grounding terminal 43. A part (connecting portion) of the substrate is integrated by, for example, integral molding (injection molding) using a PBT resin (primary molding step). At this time, the two Hall ICs 31 and 32 are held by the first resin molded product 35 so as to protrude from the upper end surface of the first resin molded product (connect holder) 35 so as to expose the sensitive surface. As a result, the two Hall ICs 31 and 32 and the lead frame 33 are integrated with the first resin molded product 35.

  And the stator core 34 divided into two shown in FIG.7 (c) is each fitted and fixed to the outer periphery of the 1st resin molded product 35 (assembly process). At this time, the two Hall ICs 31 and 32 are covered so as to be surrounded by the stator core 34 divided into two. Thereby, the stator core 34 is fixed to the first resin molded product 35, and a clearance of, for example, 0.2 mm is secured between the two Hall ICs 31 and 32.

  As shown in FIG. 1, the lead wires 36 and 37 of the two Hall ICs 31 and 32, the signal input terminal 40, the signal output terminals 41 and 42, the grounding terminal 43, the stator core 34, and the motor energizing terminal 22 is integrated by, for example, integral molding (injection molding) using a PBT resin (secondary molding step). Thus, the two Hall ICs 31 and 32, the lead frame 33, the stator core 34, and the motor energization terminal 22 are integrated (modularized) into the second resin molded product (sensor cover) 7.

[Operation of the first embodiment]
Next, the operation of the intake control device for the internal combustion engine of the present embodiment will be briefly described with reference to FIGS.

  When the driver depresses the accelerator pedal, an accelerator opening signal is input to the ECU from the accelerator opening sensor. Then, the motor 9 is energized so that the throttle valve 2 has a predetermined opening degree by the ECU, and the output shaft of the motor 9 rotates. As the output shaft rotates, the pinion gear 20 rotates and torque is transmitted to the large diameter gear 26 of the intermediate reduction gear 21.

  And if the small diameter gear 27 rotates with rotation of the large diameter gear 26, the resin gear 16 which meshes with the small diameter gear 27 will rotate. As a result, the rotor core 17 in which the resin gear 16 is insert-molded rotates, so that the shaft 3 rotates by a predetermined rotation angle, and the throttle valve 2 in the intake passage to the engine formed in the throttle body 1 has a predetermined rotation angle. Retained.

  On the other hand, the rotation angle detection device 5 detects the position of the permanent magnet 6 that rotates integrally with the rotor core 17 by the two Hall ICs 31 and 32, and sends the throttle opening to the ECU via the signal output terminals 41 and 42. Send a signal. Based on the throttle opening signal, the ECU determines how much fuel is to be injected.

[Effects of the first embodiment]
As described above, in the rotation angle detection device 5 configured to be directly assembled to the throttle valve 2, the two Hall ICs 31 and 32, the signal input terminal 40 of the lead frame 33, the signal output terminals 41 and 42, and the grounding terminal 43 and a primary molding process for performing resin molding, a subsequent molding process (assembly process) for the stator core 34, and a secondary molding process for resin molding with the second resin molded product (sensor cover) 7. In each molding step, heat and force (molding pressure, etc.) at the time of resin molding or assembly can be prevented from being applied to the two Hall ICs 31 and 32, and the arrangement positions of the two Hall ICs 31 and 32 can be determined. High accuracy can be ensured.

  Accordingly, when the sensor cover 7 in which the two Hall ICs 31 and 32, the lead frame 33, the stator core 34, and the motor energization terminal 22 are integrated by resin integral molding is assembled to the throttle valve 2, the throttle valve 2 A gap between the permanent magnet 6 fixed on the shaft 3 side and the two Hall ICs 31 and 32 integrated on the sensor cover 7 side can be easily secured. Further, by preventing the positional relationship between the two Hall ICs 31 and 32 and the permanent magnet 6 from being shifted, the opening degree of the throttle valve 2 can be detected with high accuracy.

  Further, in the rotation angle detection device 5 configured to be directly assembled to the throttle valve 2 of the present embodiment, as shown in FIGS. 5 and 6, the two Hall ICs 31 and 32 are arranged in parallel in the opposite direction by 180 degrees. As a result, the assembly of the two Hall ICs 31 and 32 including the lead frame 33 is simplified.

  The output of the other Hall IC 32 with respect to one Hall IC 31 is an output that inclines in the opposite direction from the idling position of the engine toward the fully open direction of the throttle valve 2, but is trimmed on the ECU side or Hall IC By writing and trimming itself, the output signals of the two magnetic detection elements can be made to incline to the right from the idling position of the engine toward the fully open direction of the throttle valve 2.

  Here, the reason for using the two Hall ICs 31 and 32 is that even if one Hall IC breaks down, the other Hall IC can detect the throttle opening and the malfunction of one Hall IC. This is to enable detection.

[Example 2]
FIG. 8 shows a second embodiment of the present invention, and is a diagram showing a connection portion between two Hall ICs and a lead frame.

  In the present embodiment, the two Hall ICs 31 and 32 including the lead frame 33 can be easily assembled by arranging the two Hall ICs 31 and 32 in series in the same direction.

[Example 3]
FIGS. 9 to 12 show a third embodiment of the present invention, FIG. 9 is a diagram showing a main configuration of a rotation angle detection device, and FIG. 10 is a diagram showing an intake control device for an internal combustion engine. FIG. 11 is a view showing a connection portion between two Hall ICs and four chip capacitors and a lead frame.

  The intake control device for an internal combustion engine of the present embodiment is similar to the first embodiment in that a throttle body 1 that forms an intake passage to the engine, and a throttle valve 2 that is rotatably supported in the throttle body 1. And an actuator 4 that rotationally drives the shaft 3 of the throttle valve 2 and an engine control device (hereinafter referred to as an ECU) that electronically controls the actuator 4.

  The rotation angle detection device 5 is integrally disposed on a cylindrical permanent magnet (two magnets) 6 that is a magnetic field generation source disposed on the inner peripheral surface of the rotor core 17 and a resin molded product (sensor cover) 7 side. Two Hall ICs 61, 62, a lead frame (a plurality of terminals) 63 made of a conductive metal thin plate for electrically connecting the Hall ICs 61, 62 and an external ECU, and two Hall ICs 61. , 62 and a split type stator core 64 made of an iron-based metal (magnetic material) for concentrating the magnetic flux to 62.

  The two Hall ICs 61 and 62 correspond to the electric component of the present invention and the non-contact type magnetic detection element, and are arranged facing the inner peripheral side of the permanent magnet 6 as shown in FIG. The operation is similar to the Hall ICs 31 and 32 of the first embodiment, and three types of lead wires 61a to 61c and 62a to 62c are taken out to the lead frame 63 side, respectively. The lead wires 61a and 62a are the output terminals of the two Hall ICs 61 and 62, the lead wires 61b and 62b are the input terminals of the two Hall ICs 61 and 62, and the lead wires 61c and 62c are the two output terminals. This is a ground terminal for the Hall ICs 61 and 62.

  The lead frame 63 is embedded and held in the connect holder 65 and the sensor cover 7, and has a signal input (VDD) terminal 70, two signal output (OUT 1, OUT 2) terminals 71, 72, and 2 sheets. Ground (GND) terminals 73 and 74, four chip capacitors 75 to 78, and the like.

  The lead frame 63 is electrically connected by spot welding the leading ends of the lead wires 61a to 61c and 62a to 62c of the two Hall ICs 61 and 62. Then, silver (Ag) plating is applied to both end faces of the lead frame 63. The silver plating may be applied to one end face of the lead frame 63 on the side to which the terminal portions of the four chip capacitors 75 to 78 are connected, or the terminal portions of the four chip capacitors 75 to 78 are connected. It may be applied to only a part of the part to be performed.

  The signal input terminal 70 corresponds to the external connection terminal of the present invention, is made of a conductive metal (copper plate or the like), and applies a power supply voltage (for example, a battery voltage of 5 V) to the two Hall ICs 61 and 62, respectively. It is a conductive plate. The two signal output terminals 71 and 72 correspond to the external connection terminals of the present invention, and are made of a conductive metal (copper plate or the like). The output signals of the two Hall ICs 61 and 62, that is, the throttles. It is a conductive plate for taking out an opening (throttle opening) signal of the valve 2 to the outside. Further, the two grounding terminals 73 and 74 are made of a conductive metal (copper plate or the like), and are electrically conductive for taking out the grounding terminals (lead wires) 61c and 62c of the two Hall ICs 61 and 62 to the body ground portion. It is a board.

  The four chip capacitors 75 to 78 are electrically connected to one end surface of the lead frame 63 in an exposed state using an adhesive. These chip capacitors 75 to 78 prevent the generation of radio noise (disturbance radio waves, noise radio waves) affecting other vehicles, televisions in general homes, etc., such as AM / FM radios, transceivers, personal radios, etc. In addition, it is an EMC (Electro Magnetic Compatibility) capacitor for taking out a stable output, and an EMI (Electro Magnetic Interference) countermeasure capacitor.

  As shown in FIG. 11, the two chip capacitors 75 and 76 are connected between the two signal output terminals 71 and 72 and the two ground terminals 73 and 74, respectively. The two chip capacitors 77 and 78 are connected between one signal input terminal 70 and two ground terminals 73 and 74 as shown in FIG.

  And the surface of the both terminal parts of each chip capacitor 75-78 is surface-treated with a silver (Ag) -lead (Pd) alloy, for example. Then, both terminal portions of each of the chip capacitors 75 to 78, the signal input terminal 70, the signal output terminals 71 and 72, and the ground terminals 73 and 74 are electrically connected using an adhesive made of, for example, silver (Ag) paste. Connected.

  In addition, the connection part of the lead wires 61a-61c and 62a-62c of the two Hall ICs 61 and 62 and the signal input terminal 70, the two signal output terminals 71 and 72, and the two ground terminals 73 and 74 , And the connection portions between the terminal portions of the four chip capacitors 75 to 78 and those terminals are connected holders (resin molded product, first resin) made of an ultraviolet curable resin (for example, epoxy resin: low-fat molding pressure resin). Resin molded product: primary molded product) 65.

  The two divided stator cores 64 are fitted and fixed to the outer periphery of the connect holder 65 in the same manner as in the first embodiment. The stator core 64 is provided with a groove portion 68 for securing a clearance between the two Hall ICs 61 and 62 and a fitting portion 69 fitted to the outer periphery of the connect holder 65.

[Assembly method of the third embodiment]
Next, a method for assembling the rotation angle detection device 5 according to the present embodiment will be briefly described with reference to FIGS. Here, FIG. 12 (a) is a view showing two Hall ICs and a lead frame, FIG. 12 (b) is a view showing a primary resin molded product, and FIG. 12 (c) is a stator core. FIG.

  A lead frame 63 having a predetermined shape is formed by press-molding a conductive metal thin plate, and silver plating is applied to both end faces or one end face of the lead frame 63. 11 and 12A, the lead wires 61a to 61c and 62a to 62c of the two Hall ICs 61 and 62, the signal input terminal 70, the signal output terminals 71 and 72, and the ground The tip portions (the upper end portion shown in FIG. 11) of the terminals 73 and 74 are electrically connected using a joining means such as spot welding.

  Then, after both terminal portions of the chip capacitors 75 to 78 are surface-treated with a silver-lead alloy, they are hung between the two signal output terminals 71 and 72 and the two ground terminals 73 and 74, respectively. The two chip capacitors 75 and 76 are electrically connected using an adhesive made of silver paste so as to pass. In addition, two chip capacitors 77 and 78 are electrically connected using an adhesive made of silver paste so as to be spanned between one signal input terminal 70 and two ground terminals 73 and 74, respectively. Connect to. Thus, the chip capacitors 75 to 78 can be exposed and joined to the lead frame 63.

  12B, the lead wires 61a to 61c and 62a to 62c of the two Hall ICs 61 and 62, the signal input terminal 70, the signal output terminals 71 and 72, the ground terminal 73, A part (connection portion) of the electrical wiring component composed of 74 and chip capacitors 75 to 78 is integrated by, for example, integral molding (low pressure molding) using an epoxy resin (primary molding step). As a result, the two Hall ICs 61 and 62 and the lead frame 63 are integrated with the first resin molded product 65.

  And the stator core 64 divided into two shown in FIG.12 (c) is each fitted and fixed to the outer periphery of the 1st resin molded product 65 (assembly process). As a result, the stator core 64 is fixed to the first resin molded product 65, and a predetermined clearance is secured between the two Hall ICs 61 and 62.

  As shown in FIG. 9, the lead wires 61a to 61c and 62a to 62c of the two Hall ICs 61 and 62, the signal input terminal 70, the signal output terminals 71 and 72, and the ground terminals 73 and 74, the chip The capacitors 75 to 78, the stator core 64, and the motor energizing terminal 22 are integrated by, for example, integral molding (injection molding) using PBT resin (secondary molding step). Thereby, the two Hall ICs 61 and 62, the lead frame 63, the stator core 64, and the motor energization terminal 22 are integrated (modularized) into the second resin molded product (sensor cover) 7.

[Effect of the third embodiment]
As described above, in the rotation angle detection device 5 configured to be directly assembled to the throttle valve 2, the resin integrated molding whose molding pressure is lower than that of the injection molding and the arrangement configuration of the two Hall ICs 61 and 62 and the lead frame 63 is performed. Primary molding process to be performed, and subsequent molding processes of the secondary molding process in which the arrangement configuration (assembly process) of the stator core 34 and injection molding (resin integral molding) with the second resin molded product (sensor cover) 7 are performed. It is possible to prevent heat and force (molding pressure, etc.) from being applied to the two Hall ICs 61 and 62 during resin molding and assembly, and to secure the placement positions of the two Hall ICs 61 and 62 with high accuracy. can do. Thereby, the same effect as the first embodiment can be achieved.

  In this embodiment, since the resin integral molding with a molding pressure lower than that of the injection molding is performed in the primary molding process, the primary molding process is performed without applying a high molding pressure to the four chip capacitors 75 to 78. It can be performed. As a result, the four chip capacitors 75 to 78 can be prevented from peeling off from the lead frame 63. Further, in this embodiment, since the resin integral molding with a molding pressure lower than that of the injection molding is performed in the primary molding process, the primary molding that can withstand the injection molding in the secondary molding process can be performed.

  In the present embodiment, resin integral molding with a low molding pressure using, for example, an epoxy resin is used in the primary molding step, but the chip capacitors 75 to 78 are relatively prevented from being deformed. Resin molding that protects the surroundings is desirable. Further, since the primary molding process is low-pressure molding, the lead wire take-out portions of the two Hall ICs 61 and 62 can be covered with the epoxy resin (connect holder 65). In this case, the waterproof property can be improved as compared with the first embodiment.

  In this embodiment, silver plating is applied to both end faces or one end face of the lead frame 63, the terminal portions of the chip capacitors 75 to 78 are surface-treated with a silver-lead alloy, and the chip capacitor 75 is used with an adhesive made of silver paste. By electrically connecting the terminal portions of -78 to the lead frame 63, even if heat is applied during the primary molding process and the adhesive, surface treatment agent, silver plating, etc. are oxidized, the joining means for both As compared with the case of using a solder material that melts when high-temperature heat is applied, the connection strength and electrical conductivity between the chip capacitors 75 to 78 and the lead frame 63 are not lowered. Thereby, a stable power supply voltage can be supplied to the two Hall ICs 61 and 62, and a stable output can be taken out from the two Hall ICs 61 and 62.

[Example 4]
FIGS. 13 to 17 show a fourth embodiment of the present invention. FIG. 13 is a diagram showing the arrangement relationship of a rotor core, permanent magnets, and two divided stator cores. FIG. It is the figure which showed the structure.

  The rotation angle detection device of this embodiment includes a housing 90 provided integrally with a throttle body, a sensor cover (second resin molded product) 92 for closing the opening portion of the right end of the housing 90 in the figure, a throttle A cylindrical cup-shaped rotor core 94 that rotates in accordance with the rotation of the rotation shaft 93 of a detection object such as a valve (not shown), and a plurality of magnetic detection elements integrally disposed on the sensor cover 92 side. Two Hall ICs (non-contact type magnetic detection elements) 95, a cylindrical stator core 100 divided into two to form a magnetic circuit with the rotor core 94, a lead wire (lead wire) 96 of each Hall IC 95 and an external It comprises a lead frame (external connection terminal) 97 made of a conductive metal thin plate for electrically connecting an ECU (not shown).

  In the housing 90 of the rotation angle detecting device, a rotating shaft 93 of an object to be detected such as a throttle valve is rotatably supported via a bearing (ball bearing) 98. A rotor core 94 formed of a magnetic material such as an iron-based metal is fixed to the tip of the rotating shaft 93 by caulking or the like. A stator core 100 is coaxially disposed on the inner peripheral side of the rotor core 94.

  Further, one permanent magnet (two magnets) 99 is fitted into each of the two notches 84 formed at positions opposed to each other in the radial direction in the rotor core 94, and a joining means such as an adhesive is used. Is fixed. The two permanent magnets 99 are magnetically opposed to each other through the semicircular arc portion of the rotor core 94 so that the magnetic fields of the two permanent magnets 99 repel each other inside the rotor core 94. Is arranged.

  The inner peripheral surface of the rotor core 94 is opposed to the outer peripheral surface of the stator core 100 with a minute air gap except for the vicinity of each permanent magnet 99. Accordingly, as indicated by arrows in FIG. 13, the magnetic flux emitted from the N pole of each permanent magnet 99 passes through the stator core 100 via the interior of the rotor core 94, and passes through the interior of the rotor core 94 to each permanent magnet. Return to 99 S pole. Further, in the vicinity of each permanent magnet 99 on the inner peripheral side of the rotor core 94, an air gap 89 is formed to prevent a short circuit of magnetic flux between both poles of each permanent magnet 99 and the stator core 100.

  The sensor cover 92 employs a resin molded product (second resin molded product: secondary molded product) made of a thermoplastic resin such as PBT, and a spacer made of a thermoplastic resin such as PBT (first resin molded product: 1). The lead wire 96 and the lead frame 97 of each Hall IC 95 are held together with the next molded product 91. In addition, a connector 87 for electrically connecting a distal end portion of the lead frame 91 and a wire harness connector connected to an external ECU is integrally formed on the upper end portion of the sensor cover 92 in the figure.

  Next, the structure of the stator core 100 divided into two parts according to this embodiment will be briefly described with reference to FIGS. Here, FIG. 15 is a diagram showing a stator core divided into two parts, and FIG. 16 is a diagram showing a coupling structure of the stator cores divided into two parts.

  In the central portion of the stator core 100 of the present embodiment, a magnetic detection gap 81 having a constant width for forming a parallel magnetic field is formed so as to penetrate in the diameter direction. Specifically, the stator core 100 has a magnetic detection having a constant width. It is divided into two so as to form a gap 81.

  The stator core 100 divided into two parts is a substantially semi-circular cylindrical first stator core portion (first laminated core) in which a plurality of substantially semi-disc shaped magnetic plates 110 are laminated in the thickness direction and integrated by press-fitting or bonding. Part) 101, a substantially semi-circular second stator core part (second laminated core part) 102 in which a plurality of substantially semicircular magnetic plates 120 are laminated in the thickness direction and integrated by press-fitting or bonding, and 1. It is comprised by the disk-shaped nonmagnetic plate 130 which joins the one end part of the 2nd stator core part 101,102 by press injection or adhesion | attachment. The first and second stator core portions 101 and 102 are laminated bodies in which a plurality of magnetic plates 110 and 120 are laminated, but may be integrated parts by casting an iron-based metal material.

  Here, each of the magnetic plates 110 and 120 corresponds to the magnetic material of the present invention, and an iron-based metal plate or a silicon steel plate is used. The non-magnetic plate 130 corresponds to the non-magnetic material of the present invention, and a non-magnetic resin plate such as PBT, PPS, or nylon, or a non-magnetic metal plate such as epoxy resin, stainless steel, brass, or aluminum is used. Is done. Further, as shown in FIG. 16, the magnetic plates 110 and 120 are provided with one or a plurality of convex portions 111 and 121 and one or a plurality of concave portions 112 and 122 for positioning, The nonmagnetic plate 130 is provided with a plurality of through holes 131.

  Then, the magnetic plates 110 and 120 are overlapped on the surface of the nonmagnetic plate 130, and the convex portions 111 and 121 of the first magnetic plate 110 and 120 are fitted in the through holes 131 of the nonmagnetic plate 130, and then In addition, the second magnetic plates 110 and 120 are superposed on the surfaces of the first magnetic plates 110 and 120, and the second magnetic plates are placed in the recesses 112 and 122 of the first magnetic plates 110 and 120. The convex portions 111 and 121 of the plates 110 and 120 are fitted together.

  The fitting operation is sequentially performed, and finally, a punch or the like is placed in the recesses 112 and 122 to pressurize, whereby the protrusions 111 and 121 are press-fitted into the recesses 112 and 122, and a plurality of magnetic plates 110 are arranged in the plate thickness direction. 120, and a non-magnetic plate 130 is coupled to one end thereof. Thus, by centering the magnetic plates 110 and 120, the magnetic detection gap 81 having a certain width can be secured between them, and can be easily stacked on the nonmagnetic plate 130.

  Therefore, by combining the stator core 100 constituting the magnetic circuit together with the rotor core 94 of the present embodiment by combining the magnetic plates 110 and 120 and the nonmagnetic plate 130, the resin sensor cover 92 is made of resin as shown in FIG. Even without the spacer 91 made of the metal, the first and second stator core portions 101 and 102 can be magnetically cut off, and a magnetic detection gap 81 having a constant width can be secured. Thereby, since the stator core 100 divided into two parts can be constituted by one part, the number of parts can be reduced and the cost can be reduced. Further, the resin spacer 91 can be eliminated. That is, as compared with the case where the sensor cover 7 is configured by performing the secondary molding after the primary molding as in the first and second embodiments, the primary molding is abolished, and the sensor cover 92 and the stator core 100 are formed. The integral molding can be realized by a single resin molding.

  Further, the first and second stator core portions 101 and 102 are coupled to each other by a non-magnetic plate 130 so that the first and second stator core portions 101 and 102 are magnetically cut off, whereby the first and second stator core portions 101 and 102 are coupled. A magnetic detection gap 81 having a constant width can be easily secured between the stator core portions 101 and 102. This makes it very easy to ensure the positional accuracy (magnetic detection gap 81) between the first and second stator core portions 101 and 102 with high accuracy. In addition, since the width of the magnetic detection gap 81 can be kept constant only by coupling one end portions of the first and second stator core portions 101 and 102 with the nonmagnetic plate 130, the efficiency of the magnetic circuit can be improved. Can do.

[Example 5]
FIGS. 18 to 20 show a fifth embodiment of the present invention. FIG. 18 shows a stator core divided into two parts, and FIGS. 19 and 20 show a coupling structure of the stator cores divided into two parts. FIG.

  In the present embodiment, the stator core 100 divided into two parts is laminated or sintered with a first stator core portion 101 formed by laminating or sintering a plurality of magnetic plates 110 in the plate thickness direction and a plurality of magnetic plates 120 in the plate thickness direction. The second stator core portion 102, the nonmagnetic plate 130 for connecting one end portions of the first and second stator core portions 101, 102, and the nonmagnetic portion for connecting the other end portions of the first and second stator core portions 101, 102. Plate (corresponding to the nonmagnetic material of the present invention) 140. Here, the nonmagnetic plates 130 and 140 regulate the width of the magnetic detection gap 81 by connecting the first and second stator core portions 101 and 102.

  Further, as shown in FIG. 19, the magnetic plates 110 and 120 are provided with a plurality of through holes 113 and 123 for positioning the stacking positions, and the nonmagnetic plate 130 is provided with a plurality of through holes. 113 and 123 and a plurality of through holes 133 formed on the respective axis lines are provided. The nonmagnetic plate 140 includes a plurality of support shaft portions 143 that penetrate through the through holes 113 and 123 of the magnetic plates 110 and 120 and the through holes 133 of the nonmagnetic plate 130 that are stacked in the thickness direction. Is provided. Alternatively, as shown in FIG. 20, each through hole 142 formed in the nonmagnetic plate 140, each of the through holes 113 and 123 of the magnetic plates 110 and 120 stacked in the plate thickness direction, and each of the through holes of the nonmagnetic plate 130. A plurality of support shaft parts (columnar-shaped nonmagnetic material such as resin) 170 penetrating the holes 133 are provided.

  Therefore, in the stator core 100 of the present embodiment, the support shaft part 143 formed integrally with the nonmagnetic plate 140 or the support shaft component 170 provided separately from the nonmagnetic plate 140 has a plurality of magnetic plates 110 and 120. Further, centering can be performed by penetrating the nonmagnetic plate 130. That is, the plurality of magnetic plates 110 and 120 are positioned and fixed in the diameter direction and the circumferential direction.

[Example 6]
FIG. 21 shows a sixth embodiment of the present invention and shows a stator core divided into two parts.

  The stator core 100 divided into two parts is constituted by first and second stator core parts 101 and 102 having both ends joined by non-magnetic plates 130 and 140. In the present embodiment, the first and second stator core portions 101 and 102 are formed by three magnetic plates 110 and 120 each of which constitutes a magnetic circuit together with the rotor core 94, and the other portions are formed by four non-magnetic parts. The magnetic plate 150 and one nonmagnetic plate 160 are formed to improve the efficiency of the magnetic circuit.

  In this embodiment, the non-magnetic plate 160 having a substantially annular plate shape is formed to have a smaller diameter than the non-magnetic plate 150 having a substantially annular plate shape. In addition, through holes 136, 156, and 166 are formed in the central portions of the nonmagnetic plates 130, 150, and 160. These through holes 136, 156, and 166 are extraction holes for extracting the lead wires 96 of the two Hall ICs 95 disposed between the first and second stator core portions 101 and 102 to the outside.

[Modification]
In this embodiment, an example in which Hall ICs 31, 32, 61, 62, and 95 are used as non-contact type magnetic detection elements has been described. However, Hall elements or magnetoresistive elements are used as non-contact type magnetic detection elements. May be. In addition to magnetic detection elements such as Hall ICs 61 and 62, other detection elements such as temperature sensitive elements, motors, light emitters, and power generators may be used as electrical components.

  In this embodiment, the example in which the sensor cover 7 is used as the resin molded product and the second resin molded product has been described. However, an insulating substrate may be used as the resin molded product and the second resin molded product. In this case, a sensor unit is formed by integrating the magnetic detection element, the terminal, and the stator core with the second resin molded product (insulating substrate).

  In this embodiment, the example in which the rotation angle detection device of the present invention is applied to the throttle position sensor that detects the rotation angle of the throttle valve 2 and its shaft 3 has been described. However, the rotation angle detection device of the present invention is applied to a vehicle. You may apply to the potentiometer which detects the rotation angle (opening degree) of the air mix door of an air conditioner, and its shaft.

  In the present embodiment, the example in which the present invention is applied to the intake control device for an internal combustion engine in which the throttle valve 2 and its shaft 3 are rotationally driven by the actuator 4 has been described. The present invention may be applied to an intake air control device for an internal combustion engine in which the throttle valve 2 and its shaft 3 are mechanically transmitted via a cable or an accelerator lever and the throttle valve 2 and its shaft 3 are operated.

  In the first embodiment, the example in which the cylindrical permanent magnet 6 is employed as the magnetic field generation source has been described. However, a split permanent magnet may be employed as the magnetic field generation source. In the fourth embodiment, an example in which two permanent magnets 99 are employed as the magnetic field generation source has been described. However, a cylindrical permanent magnet may be employed as the magnetic field generation source. In the third embodiment, if the capacitance of one of the chip capacitors 77 and 78 is 2A when the capacitance of the two chip capacitors 75 and 76 is A, the chip capacitor Either 77 or 78 can be abolished.

  In the third embodiment, a bonding method using an adhesive made of silver (Ag) paste is used as a bonding means between the lead frame 63 and the chip capacitors 75 to 78. However, the bonding between the lead frame 63 and the chip capacitors 75 to 78 is used. As a means, a joining method such as soldering or brazing may be used. As the brazing material, silver brazing (alloy such as silver-copper-zinc) is desirable.

It is sectional drawing which showed the main structures of the rotation angle detection apparatus (1st Example). It is sectional drawing which showed the intake control device for internal combustion engines (1st Example). It is the front view which showed the sensor cover (1st Example). It is the top view which showed the sensor cover (1st Example). FIG. 3 is a plan view showing two Hall ICs and a lead frame (first embodiment). FIG. 3 is an enlarged view showing a connection portion between two Hall ICs and a lead frame (first embodiment). (A) is a side view showing two Hall ICs and a lead frame, (b) is a sectional view showing a primary resin molded product, and (c) is a sectional view showing a stator core (first). Example). FIG. 7 is an enlarged view showing a connection portion between two Hall ICs and a lead frame (second embodiment). It is sectional drawing which showed the main structures of the rotation angle detection apparatus (3rd Example). It is sectional drawing which showed the intake control device for internal combustion engines (3rd Example). FIG. 7 is an enlarged view showing a connection portion between two Hall ICs and four chip capacitors and a lead frame (third embodiment). (A) is a side view showing two Hall ICs and a lead frame, (b) is a sectional view showing a primary resin molded product, and (c) is a sectional view showing a stator core (third). Example). It is explanatory drawing which showed the arrangement | positioning relationship of a rotor core, a permanent magnet, and the stator core divided into 2 (4th Example). It is sectional drawing which showed the main structures of the rotation angle detection apparatus (4th Example). It is sectional drawing which showed the stator core divided into 2 (4th Example). It is sectional drawing which showed the joint structure of the stator core divided into 2 (4th Example). It is sectional drawing which showed the main structures of the rotation angle detection apparatus (4th Example). It is sectional drawing which showed the stator core divided into 2 (5th Example). It is sectional drawing which showed the coupling structure of the stator core divided into 2 (5th Example). It is sectional drawing which showed the coupling structure of the stator core divided into 2 (5th Example). It is sectional drawing which showed the stator core divided into 2 (6th Example).

Explanation of symbols

1 Throttle body (housing)
2 Throttle valve (object to be detected)
3 Shaft 4 Actuator 5 Rotation angle detection device (terminal device)
6 Permanent magnet (2 magnets)
7 Sensor cover (resin molded product, second resin molded product)
9 Motor 11 Ball bearing (bearing part)
13 Thrust bearing (bearing part)
17 Rotor core 31 Hall IC (Non-contact type magnetic detection element)
32 Hall IC (Non-contact type magnetic detection element)
33 Lead frame 34 Stator core 35 Connect holder (first resin molded product)
40 Signal input terminal 41 Signal output terminal (external connection terminal)
42 Signal output terminal (external connection terminal)
43 Grounding terminal 61 Hall IC (Non-contact type magnetic detection element)
62 Hall IC (Non-contact type magnetic detection element)
63 Lead frame 64 Stator core 65 Connect holder (resin molded product, first resin molded product)
70 Signal input terminal (external connection terminal)
71 Signal output terminal (external connection terminal)
72 Signal output terminal (external connection terminal)
73 Grounding terminal 74 Grounding terminal 75 Chip capacitor 76 Chip capacitor 77 Chip capacitor 78 Chip capacitor 81 Magnetic detection gap 90 Housing 91 Spacer (first resin molded product)
92 Sensor cover (second resin molded product)
93 Rotating shaft of throttle valve (detected object) 94 Rotor core 95 Hall IC (magnetic detection element)
96 Lead wire
97 Lead frame (external connection terminal)
99 Permanent magnet (2 magnets)
DESCRIPTION OF SYMBOLS 100 Stator core 101 1st stator core part 102 2nd stator core part 110 Magnetic plate (magnetic material)
113 Through-hole 120 Magnetic plate (magnetic material)
123 Through-hole 130 Non-magnetic plate (non-magnetic material)
133 Through-hole 140 Non-magnetic plate (non-magnetic material)
142 Through-hole 143 Support shaft 150 Non-magnetic plate (non-magnetic material)
160 Non-magnetic plate (non-magnetic material)
170 Spindle parts

Claims (5)

(A) a rotor core that is formed in a cylindrical shape and that is arranged with two magnets that are opposite to each other and magnetized in opposite directions, and that rotates with the rotation of the object to be detected; A non-contact type magnetic detection element that is disposed opposite to the inner peripheral side of the two magnets at the center of the rotor core and detects the rotation angle of the detection object under the magnetic force of the two magnets; (C) a stator core that forms a magnetic circuit together with the rotor core and concentrates the magnetic flux to the magnetic detection element; (d) an external connection terminal for taking out the output of the forearm magnetic detection element; and (e) A first resin molded product that integrally holds the magnetic detection element and the external connection terminal by resin molding; and (f) a second resin that integrally holds the stator core and the first resin molded product by resin molding. Comprises a shaped piece, wherein the stator core, characterized by having a groove for securing a clearance between the magnetic detection element, and a fitting portion fitted to the outer periphery of the first resin molded product A rotation angle detection device.   2. The rotation angle detection device according to claim 1, wherein the first and second resin molded product manufacturing steps include a first molding step of integrating a connection portion between the magnetic detection element and the external connection terminal by resin molding. And an assembly step of assembling the stator core to the magnetic detection element, and a secondary molding step of integrating the magnetic detection element, the stator core and the external connection terminal by resin molding. Angle detection device.   2. The rotation angle detection device according to claim 1, wherein the stator core includes a first stator core portion formed by laminating, sintering, or forging a plurality of magnetic materials in a plate thickness direction, and the same magnetic material as the first stator core portion. The first and second stator core portions have a second stator core portion that is laminated, sintered, or forged in the thickness direction, and the first and second stator core portions form a magnetic detection gap having a constant width. A rotation angle detection device comprising a nonmagnetic material for joining the end portions. 4. The rotation angle detection device according to claim 3 , wherein the first and second stator core portions are formed of a magnetic material in a portion constituting the magnetic circuit, and other portions are formed of a non-magnetic material. Rotation angle detection device. The rotation angle detection device according to claim 2, wherein a molding pressure in the primary molding step is lower than a molding pressure in the secondary molding step.

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