Rotating machines

Abstract

To omit a magnet for position detection.SOLUTION: A rotary machine 1 includes a stator 11, a rotor 12, a rotating shaft 13 and a magnetic sensor 14. The rotor 12 rotates against the stator 11. The rotating shaft 13 is connected with the rotor 12 and rotates in accordance with the rotation of the rotor 12. The magnetic sensor 14 detects a position of the rotor 12. The rotor 12 has a plurality of magnets. The magnetic sensor 14 opposes to the rotor 12 in an axial direction D1 which is a direction parallel to the rotating shaft 13 and detects the position of the rotor 12 on the basis of a magnetic field from the plurality of magnets of the rotor 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure generally relates to a rotating On the spot More particularly, a rotating device equipped with a magnetic sensor On the spot Regarding. [Background technology]

[0002] Patent Document 1 describes a rotating electric machine including a rotor and a stator. The rotor has a substantially cylindrical rotor carrier and an annular magnet unit fixed to the rotor carrier. The stator has an annular stator core and a stator winding attached to the outer peripheral surface of the stator core. The stator winding faces the magnet unit across a predetermined air gap.

[0003] The rotating electric machine described in Patent Document 1 further includes a Hall element provided at a position overlapping the magnet unit in the direction of the rotation axis, and a sensor magnet fixed to the rotation axis, the sensor magnet being provided at a position separated from the Hall element in the direction of the rotation axis. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-44948 Summary of the Invention [Problem to be solved by the invention]

[0005] The rotating machine (rotating electric machine) described in Patent Document 1 required a position detection magnet (sensor magnet) to detect the position of the rotor, in addition to the magnet unit for rotating the rotor relative to the stator.

[0006] The object of the present disclosure is to provide a rotating device that can omit a magnet for position detection. The machine The purpose is to provide. [Means for solving the problem]

[0007] A rotating machine according to one aspect of the present disclosure includes a stator, a rotor, a rotating shaft, and a magnetic sensor. The housing and The rotor rotates relative to the stator. The rotating shaft is connected to the rotor and rotates with the rotation of the rotor. The magnetic sensor detects the position of the rotor. The housing accommodates at least the stator and the rotor. The rotor has a plurality of magnets. The magnetic sensor includes a sensor unit having a magnetoresistive effect element formed on the same plane, and a substrate having one surface. The sensor unit is disposed on the one surface of the substrate so that the plane is parallel to the one surface of the substrate. The housing has a through-hole penetrating the housing in the axial direction. The magnetic sensor is attached to the housing by fixing the substrate to the housing with at least a portion of the substrate inserted into the through-hole and the sensor unit positioned within the housing. The rotating machine further includes a sealing member that seals the through-hole when the magnetic sensor is attached to the housing. The magnetic sensor faces the rotor in the axial direction parallel to the rotation axis, and detects the position of the rotor based on magnetic fields from the plurality of magnets of the rotor. [Effects of the Invention]

[0010] Rotation according to one aspect of the present disclosure On the spot This makes it possible to omit the magnet for position detection. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic cross-sectional view of a rotating machine according to a first embodiment. [Figure 2] FIG. 2 is a schematic diagram of a rotor and a rotating shaft used in the rotating machine. [Figure 3] FIG. 3 is a schematic diagram showing the arrangement of a plurality of magnets of a rotor used in the rotating machine. [Figure 4] FIG. 4 is a circuit diagram of a bridge circuit of a magnetic sensor used in the rotating machine. [Figure 5] FIG. 5 is a circuit diagram of another bridge circuit of the magnetic sensor used in the rotating machine. [Figure 6] FIG. 6 is a schematic diagram of an installation range of a magnetic sensor used in the rotating machine. [Figure 7] FIG. 7 is a schematic diagram of another installation range of the magnetic sensor used in the rotating machine. [Figure 8] FIG. 8 is a waveform diagram of a magnetic sensor used in the rotating machine. [Figure 9] FIG. 9 is a schematic cross-sectional view of a rotating machine according to the second embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view of a rotating machine according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a rotating machine, a manufacturing method for a rotating machine, and a magnetic sensor according to embodiments 1 to 3 will be described with reference to the drawings. Each of FIGS. 1 to 3, 6, 7, 9, and 10 described in the following embodiments 1 to 3 is a schematic diagram, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments 1 to 3 are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments 1 to 3, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0013] (Embodiment 1) A rotating machine 1, a manufacturing method for the rotating machine 1, and a magnetic sensor 14 according to a first embodiment will be described with reference to FIGS.

[0014] (1) Overview First, an overview of a rotating machine 1 and a magnetic sensor 14 according to the first embodiment will be described with reference to FIG.

[0015] The rotating machine 1 according to the first embodiment is, for example, an in-vehicle rotating machine mounted on an electric vehicle and used as a power source for the electric vehicle. The rotating machine 1 is, for example, an electric motor (motor). More specifically, the rotating machine 1 is, for example, a brushless motor. The rotating machine 1 generates power (rotational torque) by rotating a rotating shaft 13 (see FIG. 1) using DC power supplied from a battery (not shown) mounted on the electric vehicle.

[0016] The rotating machine 1 and the magnetic sensor 14 according to the first embodiment employ the following configuration in order to omit a position detection magnet for detecting the position of the rotor 12.

[0017] That is, as shown in FIG. 1, the rotating machine 1 according to the first embodiment includes a stator 11, a rotor 12, a rotating shaft 13, and a magnetic sensor 14. The rotor 12 rotates relative to the stator 11. The rotating shaft 13 is connected to the rotor 12 and rotates as the rotor 12 rotates. The magnetic sensor 14 detects the position of the rotor 12. The rotor 12 has a plurality of magnets 122 (see FIG. 3). The magnetic sensor 14 faces the rotor 12 in the axial direction D1 and detects the position of the rotor 12 based on the magnetic field from the plurality of magnets 122 (see FIG. 3) of the rotor 12. The axial direction D1 is a direction parallel to the longitudinal direction of the rotating shaft 13.

[0018] 1, the magnetic sensor 14 according to the first embodiment is a magnetic sensor used in a rotating machine 1 including a stator 11, a rotor 12, and a rotating shaft 13. The rotor 12 rotates relative to the stator 11. The rotating shaft 13 is connected to the rotor 12 and rotates in conjunction with the rotation of the rotor 12. The rotor 12 has a plurality of magnets 122 (see FIG. 3). The magnetic sensor 14 faces the rotor 12 in the axial direction D1 and detects the position of the rotor 12 based on the magnetic fields from the plurality of magnets 122 (see FIG. 3) of the rotor 12. The axial direction D1 is a direction parallel to the longitudinal direction of the rotating shaft 13.

[0019] In the rotating machine 1 and magnetic sensor 14 according to the first embodiment, as described above, the magnetic sensor 14 faces the rotor 12 in the axial direction D1 and detects the position of the rotor 12 based on the magnetic fields from the multiple magnets 122 (see FIG. 3 ) of the rotor 12. This eliminates the need for a position detection magnet for detecting the position of the rotor 12, making it possible to omit the position detection magnet. In other words, there is no need to provide a position detection magnet separate from the multiple magnets 122 of the rotor 12.

[0020] (2)Details Next, the rotating machine 1 and the magnetic sensor 14 according to the first embodiment will be described in detail with reference to FIGS.

[0021] 1, the rotating machine 1 according to the first embodiment includes a stator 11, a rotor 12, a rotating shaft 13, and a magnetic sensor 14. The rotating machine 1 according to the first embodiment further includes a housing 15. As described above, the rotating machine 1 is used as, for example, an electric motor.

[0022] (2.1) Stator As shown in FIGS. 1, 6, and 7, the stator 11 includes a stator core 111, a plurality of teeth 112, and a plurality of coils 113. As shown in FIGS.

[0023] As shown in FIG. 7, the stator core 111 has, for example, an annular shape when viewed from above in the axial direction D1. The axial direction D1 is a direction parallel to a rotating shaft 13 (described later) (the vertical direction in FIG. 1). The stator core 111 is formed of a magnetic material such as a silicon steel plate. More specifically, the stator core 111 is formed by stacking a plurality of silicon steel plates in the thickness direction. Therefore, the cross section of the stator core 111 along the circumferential direction is rectangular.

[0024] Each of the plurality of teeth 112 protrudes from the inner peripheral surface of stator core 111 toward the center of stator core 111. The plurality of teeth 112 are arranged at equal intervals along the circumferential direction of stator core 111. Like stator core 111, each of the plurality of teeth 112 is formed by stacking a plurality of silicon steel plates in the thickness direction. The plurality of teeth 112 may be formed integrally with stator core 111 described above, or may be formed separately.

[0025] The multiple coils 113 correspond one-to-one to the multiple teeth 112. Each of the multiple coils 113 is formed by winding a conductive wire around the outer circumferential surface of a corresponding one of the multiple teeth 112. The winding axis direction of each of the multiple coils 113 is the direction along the protruding direction of the corresponding tooth 112.

[0026] (2.2) Rotor The rotor 12 rotates relative to the above-described stator 11. The rotor 12 rotates relative to the stator 11, thereby rotating the rotating shaft 13 described below. In other words, the rotation of the rotor 12 relative to the stator 11 transmits power (rotational torque) to the rotating shaft 13.

[0027] As shown in FIGS. 1 to 3, the rotor 12 has a rotor core 121 and a plurality of magnets 122 (eight in the illustrated example).

[0028] Rotor core 121 is, for example, cylindrical and is arranged so that the direction of its central axis is parallel to axial direction D1. Rotor core 121 is formed of a magnetic material such as a silicon steel plate. More specifically, rotor core 121 is formed by stacking multiple silicon steel plates in the thickness direction.

[0029] The rotor core 121 has a shaft hole 1211 (see FIG. 3). The shaft hole 1211 is provided in the center of the rotor core 121 and penetrates the rotor core 121 in the thickness direction (axial direction D1) of the rotor core 121. The inner diameter (diameter) of the shaft hole 1211 is approximately the same as the outer diameter (diameter) of the rotating shaft 13.

[0030] Each of the multiple (eight in the illustrated example) magnets 122 is, for example, a permanent magnet (neodymium magnet, for example). Each of the multiple magnets 122 has, for example, an arc shape when viewed from above in the axial direction D1 (see FIG. 3). The multiple magnets 122 are arranged along the outer circumferential surface 1213 of the rotor core 121, and are arranged in an annular shape when viewed from above in the axial direction D1. This results in multiple magnetic poles (south poles and north poles) being alternately arranged along the circumferential direction of the rotor core 121.

[0031] Each of the multiple magnets 122 is magnetized along the radial direction of the rotor core 121. For example, if the outer magnetic pole of a certain magnet 122 in the radial direction of the rotor core 121 is an "S pole," the inner magnetic pole is an "N pole." In the rotating machine 1 according to the first embodiment, the multiple magnets 122 are arranged along the outer circumferential surface (surface) of the rotor core 121. That is, the rotating machine 1 according to the first embodiment is an SPM (Surface Permanent Magnet) motor. Note that in FIG. 3, only the outer magnetic pole of each magnet 122 in the radial direction of the rotor core 121 is shown, and the inner magnetic pole is not shown.

[0032] The rotor 12 configured as described above rotates due to the magnetic field generated by the multiple magnets 122 and the magnetic field generated by current flowing through the multiple coils 113 of the stator 11, and transmits the generated torque (rotational torque) to the rotating shaft 13.

[0033] (2.3) Rotation axis 1 to 3, the rotating shaft 13 is, for example, a round bar that is long along the axial direction D1. The rotating shaft 13 is attached to the rotor core 121 in a state where it is inserted into a shaft hole 1211 of the rotor core 121. The rotating shaft 13 rotates in conjunction with the rotation of the rotor 12. That is, the rotating shaft 13 is connected to the rotor 12, and rotates in conjunction with the rotation of the rotor 12.

[0034] (2.4) Magnetic Sensor The magnetic sensor 14 detects the position of the rotor 12. More specifically, the magnetic sensor 14 detects the position of the rotor 12 based on a magnetic field generated on the opposing surface 1212 side of the rotor core 121 by a plurality of magnets 122 arranged along the outer circumferential surface 1213 of the rotor core 121 of the rotor 12. The opposing surface 1212 of the rotor core 121 is the surface of the rotor core 121 that faces the magnetic sensor 14 in the axial direction D1.

[0035] As shown in FIG. 1, the magnetic sensor 14 includes a substrate 141 and a sensor unit 142.

[0036] The substrate 141 is, for example, a printed wiring board. The substrate 141 has one surface 1411. The one surface 1411 is a mounting surface on which the sensor unit 142 is mounted. The substrate 141 is fixed to the housing 15 (described later) by an appropriate fixing means. The fixing means is, for example, a screw, double-sided tape, or Velcro (registered trademark).

[0037] 4 and 5, the sensor unit 142 has a plurality of (eight in the illustrated example) magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402. Each of the plurality of magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402 is, for example, a giant magnetoresistive effect (GMR) element.

[0038] 1, the sensor unit 142 includes a base material 1421 and a magnetoresistive film 1422. The magnetoresistive film 1422 is formed on a surface 1423 of the base material 1421 opposite to the substrate 141 side. The magnetoresistive film 1422 constitutes the above-mentioned multiple magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402. That is, in the rotating machine 1 according to the first embodiment, the surface 1423 of the base material 1421 opposite to the substrate 141 side is the same plane (hereinafter also referred to as "plane 1423") on which the magnetoresistive elements 101, 102, 201, 202, 301, 302, 401, and 402 are formed. As shown in FIG. 1, the sensor unit 142 is disposed (mounted) on one surface 1411 of the substrate 141 so that the flat surface 1423 of the base material 1421 is parallel to the one surface 1411 of the substrate 141.

[0039] 1, the magnetic sensor 14 is attached to the housing 15 by fixing the substrate 141 to the housing 15 with a portion of the substrate 141 inserted into a through-hole 1522 of the housing 15 (described later) and the sensor unit 142 positioned inside the housing 15. That is, in the rotating machine 1 according to the first embodiment, a portion of the substrate 141 is exposed to the outside of the housing 15. Then, when the magnetic sensor 14 is attached to the housing 15, the through-hole 1522 is sealed with a sealing member 16. The sealing member 16 is, for example, a molded product made of silicone rubber.

[0040] (2.5) Housing Housing 15 is, for example, a molded product made by die-casting aluminum. Housing 15 is, for example, a hollow cylindrical shape. As shown in Fig. 1, housing 15 has a case 151 and a cover 152. Case 151 and cover 152 are each a molded product made by die-casting aluminum.

[0041] The case 151 is cylindrical and has one open surface (the upper surface in FIG. 1). As shown in FIG. 1, the case 151 has a shaft hole 1511. The shaft hole 1511 penetrates the bottom plate 1512 of the case 151 in the thickness direction (axial direction D1) of the bottom plate 1512 of the case 151 at the center of the bottom plate 1512 of the case 151. The shaft hole 1511 is circular in a plan view from the axial direction D1. The inner diameter (diameter) of the shaft hole 1511 is larger than the outer diameter (diameter) of the rotating shaft 13.

[0042] 1, the cover 152 has a shaft hole 1521 and a through-hole 1522. The shaft hole 1521 penetrates the cover 152 in the thickness direction (axial direction D1) of the cover 152 at the center of the cover 152. The shaft hole 1521 is circular in a plan view from the axial direction D1, and has the same size as the shaft hole 1511.

[0043] The through hole 1522 is provided at a position facing the rotor core 121 of the rotor 12 in the axial direction D1. The through hole 1522 penetrates the cover 152 along the thickness direction of the cover 152 (axial direction D1). The through hole 1522 has, for example, a rectangular shape when viewed from above in the axial direction D1. The through hole 1522 has a size that allows the above-mentioned magnetic sensor 14 to be inserted therethrough. Therefore, according to the rotating machine 1 of the first embodiment, it is possible to attach the magnetic sensor 14 to the housing 15 after the stator 11, the rotor 12, and the rotating shaft 13 are assembled to the housing 15. In other words, it is possible to retrofit the magnetic sensor 14 to the rotating machine 1 as a completed product.

[0044] The housing 15 is assembled integrally by attaching a cover 152 to the case 151 so as to close the top opening of the case 151.

[0045] The integrally assembled case 151 and cover 152, i.e., housing 15, houses at least the stator 11 and rotor 12. More specifically, as shown in FIG. 1 , housing 15 houses the stator 11, rotor 12, part of the rotating shaft 13, and part of the magnetic sensor 14.

[0046] The housing 15 rotatably holds the rotary shaft 13, part of which is exposed through the shaft hole 1511 of the case 151 and the shaft hole 1521 of the cover 152, via a plurality of bearings (not shown).

[0047] (3) Circuit configuration of magnetic sensor Next, the circuit configuration of the magnetic sensor 14 will be described with reference to FIGS.

[0048] As shown in FIGS. 4 and 5, the magnetic sensor 14 includes a first half-bridge circuit 10, a second half-bridge circuit 20, a third half-bridge circuit 30, and a fourth half-bridge circuit 40.

[0049] As shown in FIG. 4, the first half-bridge circuit 10 has a pair of magnetoresistive effect elements 101, 102 and a first output terminal 103. The pair of magnetoresistive effect elements 101, 102 detect a magnetic field along a first direction (the up-and-down direction in FIG. 4). The first direction is a direction perpendicular to a plane 1423 of a substrate 1421 of the magnetic sensor 14. The first output terminal 103 outputs a first output signal from a connection point between the pair of magnetoresistive effect elements 101, 102. The first output signal is, for example, a sine wave signal.

[0050] As shown in FIG. 5, the second half-bridge circuit 20 has a pair of magnetoresistive effect elements 201, 202 and a second output terminal 203. The pair of magnetoresistive effect elements 201, 202 detect a magnetic field along a second direction (the left-right direction in FIG. 5). The second direction is perpendicular to the plane 1423 of the substrate 1421 of the magnetic sensor 14 and perpendicular to the first direction. The second output terminal 203 outputs a second output signal from a connection point between the pair of magnetoresistive effect elements 201, 202. The second output signal is, for example, a cosine wave signal.

[0051] As shown in FIG. 4 , the third half-bridge circuit 30 includes a pair of magnetoresistive elements 301 and 302 and a third output terminal 303. The pair of magnetoresistive elements 301 and 302 detect a magnetic field along a first direction. The high-potential magnetoresistive element 301 of the pair of magnetoresistive elements 301 and 302 detects a magnetic field antiparallel to the high-potential magnetoresistive element 102 of the pair of magnetoresistive elements 101 and 102. The low-potential magnetoresistive element 302 of the pair of magnetoresistive elements 301 and 302 detects a magnetic field antiparallel to the low-potential magnetoresistive element 101 of the pair of magnetoresistive elements 101 and 102. The third output terminal 303 outputs a third output signal from a connection point between the pair of magnetoresistive elements 301 and 302. The third output signal is, for example, a sinusoidal signal having an opposite phase to the first output signal.

[0052] As shown in FIG. 5 , the fourth half-bridge circuit 40 includes a pair of magnetoresistive elements 401 and 402 and a fourth output terminal 403. The pair of magnetoresistive elements 401 and 402 detect a magnetic field along the second direction. The higher-potential magnetoresistive element 402 of the pair of magnetoresistive elements 401 and 402 detects a magnetic field antiparallel to the higher-potential magnetoresistive element 201 of the pair of magnetoresistive elements 201 and 202. The lower-potential magnetoresistive element 401 of the pair of magnetoresistive elements 401 and 402 detects a magnetic field antiparallel to the lower-potential magnetoresistive element 202 of the pair of magnetoresistive elements 201 and 202. The fourth output terminal 403 outputs a fourth output signal from a connection point between the pair of magnetoresistive elements 401 and 402. The fourth output signal is, for example, a cosine wave signal having an opposite phase to the second output signal.

[0053] That is, in the rotating machine 1 according to the first embodiment, the pair of magnetoresistive effect elements 101, 102 and the pair of magnetoresistive effect elements 301, 302 are first magnetoresistive effect elements. Also, in the rotating machine 1 according to the first embodiment, the pair of magnetoresistive effect elements 201, 202 and the pair of magnetoresistive effect elements 401, 402 are second magnetoresistive effect elements.

[0054] 4, a first terminal of the magnetoresistive effect element 101 is connected to the ground. A second terminal of the magnetoresistive effect element 101 is connected to a first terminal of the magnetoresistive effect element 102. A second terminal of the magnetoresistive effect element 102 is connected to a power supply (Vcc). That is, the pair of magnetoresistive effect elements 101 and 102 are connected in series between the power supply and the ground.

[0055] 5, a first terminal of the magnetoresistive effect element 201 is connected to a power supply (Vcc). A second terminal of the magnetoresistive effect element 201 is connected to a first terminal of the magnetoresistive effect element 202. A second terminal of the magnetoresistive effect element 202 is connected to the ground. That is, the pair of magnetoresistive effect elements 201 and 202 are connected in series between the power supply and the ground.

[0056] 4, a first terminal of the magnetoresistive effect element 301 is connected to a power supply (Vcc). A second terminal of the magnetoresistive effect element 301 is connected to a first terminal of the magnetoresistive effect element 302. A second terminal of the magnetoresistive effect element 302 is connected to the ground. That is, the pair of magnetoresistive effect elements 301 and 302 are connected in series between the power supply and the ground.

[0057] 5, a first terminal of the magnetoresistive effect element 401 is connected to the ground. A second terminal of the magnetoresistive effect element 401 is connected to a first terminal of the magnetoresistive effect element 402. A second terminal of the magnetoresistive effect element 402 is connected to a power supply (Vcc). That is, the pair of magnetoresistive effect elements 401 and 402 are connected in series between the power supply and the ground.

[0058] The first output signal output from first output terminal 103, the second output signal output from second output terminal 203, the third output signal output from third output terminal 303, and the fourth output signal output from fourth output terminal 403 are input to a processing circuit (not shown). The processing circuit includes a computer system having one or more processors and a memory. The processor of the computer system executes a program recorded in the memory of the computer system, thereby realizing the functions of the processing circuit. The program may be recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.

[0059] The processing circuit is mounted on, for example, the substrate 141 of the magnetic sensor 14. The processing circuit determines the direction of the magnetic field applied to the magnetic sensor 14 based on the first output signal, the second output signal, the third output signal, and the fourth output signal.

[0060] (4) Magnetic sensor placement Next, the arrangement of the magnetic sensor 14 will be described with reference to FIGS.

[0061] As described above, the magnetic sensor 14 is attached to the housing 15 by fixing the substrate 141 to the housing 15 with a portion of the substrate 141 inserted into the through-hole 1522 of the housing 15 and the sensor unit 142 positioned inside the housing 15. In other words, the magnetic sensor 14 is attached to the housing 15 so that a portion of the magnetic sensor 14 is positioned inside the housing 15 and the remaining portion of the magnetic sensor 14 is positioned outside the housing 15. When the magnetic sensor 14 is attached to the housing 15, the magnetic sensor 14 faces the rotor core 121 of the rotor 12 in the axial direction D1, as shown in FIG. 1 . Furthermore, when the magnetic sensor 14 is attached to the housing 15, the surface 1212 of the rotor 12 facing the magnetic sensor 14 and the flat surface 1423 of the base material 1421 of the sensor unit 142 of the magnetic sensor 14 are perpendicular to each other. In this disclosure, "orthogonal" may refer not only to a state in which the angle between two elements is exactly 90 degrees, but also to a state in which the angle between two elements is within a tolerance range (e.g., ±5 degrees) that provides a substantial effect.

[0062] Here, it is preferable that the center point C1 (see FIG. 1) of the sensor unit 142 of the magnetic sensor 14 is included in both the area a1 and the area a2, as shown in FIGS. 6 and 7. The center point C1 is the center point of the plane 1423 of the base material 1421 that constitutes the sensor unit 142.

[0063] 6, in a plan view from a direction orthogonal to both the axial direction D1 and the orthogonal direction D2 (a direction perpendicular to the plane of FIG. 6), the region a1 is an region surrounded by a first line segment L2 in the axial direction D1 and a second line segment L4 in the orthogonal direction D2. When the outer dimension (height dimension) of the rotor core 121 of the rotor 12 in the axial direction D1 is L1 (a first value), the length of the first line segment L2 is 0.8 times the first value L1. In other words, the first line segment L2 is a line segment that connects a surface 1212 of the rotor core 121 of the rotor 12 that faces the magnetic sensor 14 with a first position P1 at a distance L2 from the facing surface 1212 in the axial direction D1.

[0064] On the other hand, when the distance from the outer edge of the opposing surface 1212 in the orthogonal direction D2 to the rotation axis 13 is L3 (second value), the second line segment L4 has a length that is 0.8 times the second value L3. In other words, the second line segment L4 is a line segment that connects the outer edge of the opposing surface 1212 in the orthogonal direction D2 to the second position P2, where the distance from the outer edge is L4.

[0065] 7, in a plan view from the axial direction D1 (a direction perpendicular to the paper surface of FIG. 7), the region a2 is a rectangular region surrounded by the second line segment L4 in the orthogonal direction D2 and the third line segment L5 in the direction D3 orthogonal to both the axial direction D1 and the orthogonal direction D2. When the diameter of the rotor core 121 of the rotor 12 is d3 (a third value), the third line segment L5 has a length 0.2 times the third value d3.

[0066] If the center point C1 of the sensor portion 142 of the magnetic sensor 14 is included in both the above-mentioned area a1 and area a2, the detection accuracy of the magnetic sensor 14 can be further improved.

[0067] (5) Manufacturing method of rotating machine Next, a method for manufacturing the rotating machine 1 according to the first embodiment will be described.

[0068] The manufacturing method of the rotating machine 1 according to the first embodiment is a manufacturing method of the rotating machine 1 including a stator 11, a rotor 12, a rotating shaft 13, and a magnetic sensor 14. The rotor 12 rotates relative to the stator 11. The rotating shaft 13 is connected to the rotor 12 and rotates as the rotor 12 rotates. The magnetic sensor 14 detects the position of the rotor 12. The rotor 12 has a plurality of magnets 122. The magnetic sensor 14 detects the position of the rotor 12 based on magnetic fields from the plurality of magnets 122 of the rotor 12. The manufacturing method of the rotating machine 1 includes a step of arranging the magnetic sensor 14 so that the magnetic sensor 14 and the rotor 12 face each other in the axial direction D1. The axial direction D1 is a direction parallel to the rotating shaft 13.

[0069] In the manufacturing method of the rotating machine 1 according to the first embodiment, the magnetic sensor 14 is arranged to face the rotor 12 in the axial direction D1. The magnetic sensor 14 arranged in this manner can detect the position of the rotor 12 based on the magnetic field from the multiple magnets 122 of the rotor 12. Therefore, a position detection magnet for detecting the position of the rotor 12 is not required, and it is possible to omit the position detection magnet.

[0070] A method for manufacturing the rotating machine 1 will now be described.

[0071] First, the worker performs a first attachment step of attaching the rotating shaft 13 to the rotor 12. More specifically, in the first attachment step, the worker inserts the rotating shaft 13 into the shaft hole 1211 provided in the rotor core 121 of the rotor 12, and then attaches the rotating shaft 13 to the rotor core 121 via an appropriate attachment means.

[0072] Next, the worker performs a storing step of storing the stator 11, the rotor 12, and the rotating shaft 13 in the case 151 of the housing 15. More specifically, in the storing step, the worker inserts a first end (the lower end in FIG. 1 ) of the rotating shaft 13 into a shaft hole 1511 provided in the case 151 of the housing 15, and stores the rotor 12 and the rotating shaft 13 in the case 151. Also, in the storing step, the worker stores the stator 11 in the case 151 so as to surround the rotor 12 and the rotating shaft 13.

[0073] Next, the worker performs a second attachment step of attaching the cover 152 to the case 151. More specifically, in the second attachment step, the worker inserts the second end (the upper end in FIG. 1) of the rotating shaft 13 into the shaft hole 1521 provided in the cover 152, and then moves the cover 152 closer to the case 151 to attach the cover 152 to the case 151.

[0074] Next, the worker performs a third attachment step of attaching the magnetic sensor 14 to the integrally assembled rotating machine 1. More specifically, in the third attachment step, the worker inserts a portion of the substrate 141 of the magnetic sensor 14 into the housing 15 through a through-hole 1522 provided in the cover 152 of the housing 15. Then, the worker fixes the substrate 141 to the cover 152 of the housing 15 using, for example, double-sided tape. At this time, the magnetic sensor 14 faces the rotor 12 in the axial direction D1, as shown in FIG. 1 . That is, the manufacturing method of the rotating machine 1 includes a step of arranging the magnetic sensor 14 so that the magnetic sensor 14 and the rotor 12 face each other in the axial direction D1. Finally, the through-hole 1522 provided in the cover 152 of the housing 15 is sealed with the sealing member 16, thereby completing the assembly of the rotating machine 1.

[0075] (6) Magnetic sensor characteristics Next, the characteristics of the magnetic sensor 14 will be described with reference to FIG.

[0076] When the magnetic sensor 14 is located at a predetermined reference position (deviation amount: ±0 mm) in the axial direction D1, the waveform of the magnetic field detected by the magnetic sensor 14 is an ideal waveform with almost no phase deviation from the ideal waveform, as shown by the Lissajous waveform. In this case, the differential output waveforms show sine and cosine waveforms with little distortion.

[0077] When the position of the magnetic sensor 14 is shifted 2 mm upward in the axial direction D1 compared to the reference position, as shown by the Lissajous waveform, the waveform of the magnetic field detected by the magnetic sensor 14 has a small phase deviation from the ideal waveform. In this case, as shown by the differential output waveform, the sine wave and cosine wave waveforms have little distortion.

[0078] When the position of the magnetic sensor 14 is shifted 2 mm downward in the axial direction D1 compared to the reference position, as shown by the Lissajous waveform, the waveform of the magnetic field detected by the magnetic sensor 14 has a small phase deviation from the ideal waveform. In this case, as shown by the differential output waveform, the sine wave and cosine wave waveforms have little distortion.

[0079] In this way, if the position of the magnetic sensor 14 in the axial direction D1 is within a range of ±2 mm with respect to the reference position, it is possible to acquire waveforms (sine and cosine waveforms) with little phase shift and distortion.

[0080] On the other hand, although not shown in the figure, if a magnetic sensor (strictly speaking, a sensor unit) is arranged at a position facing the stator 11 in the axial direction D1, the phase shift from the ideal waveform in the Lissajous waveform will be large, and further, the differential output waveform will become a sine wave waveform and a cosine wave waveform with large distortion.Furthermore, although not shown in the figure, if a magnetic sensor (strictly speaking, a sensor unit) is arranged next to the stator 11 in the radial direction of the rotor 12, similarly, the phase shift from the ideal waveform in the Lissajous waveform will be large, and further, the differential output waveform will become a sine wave waveform and a cosine wave waveform with large distortion.

[0081] (7) Effects In the rotating machine 1 according to the first embodiment, the magnetic sensor 14 is disposed at a position facing the rotor 12 in the axial direction D1, and detects the position of the rotor 12 based on the magnetic fields from the plurality of magnets 122 of the rotor 12. Therefore, a position detection magnet for detecting the position of the rotor 12 is not required, and it is possible to omit the position detection magnet. Furthermore, in the rotating machine 1 according to the first embodiment, the magnetic sensor 14 detects the magnetic fields of the plurality of magnets 122 of the rotor 12 that constitute the rotating machine 1, and therefore it is possible to suppress the influence of external disturbances. Furthermore, the rotating machine 1 according to the first embodiment is compatible with a plurality of types of rotating machines 1.

[0082] In the rotating machine 1 according to the first embodiment, the opposing surface 1212 of the rotor 12 and the flat surface 1423 of the magnetic sensor 14 are perpendicular to each other. This makes it possible to detect the magnetic field from the multiple magnets 122 of the rotor 12 as at least one of a sine wave and a cosine wave.

[0083] In the rotating machine 1 according to the first embodiment, the magnetic sensor 14 includes magnetoresistive effect elements 101, 102, 301, and 302 that detect a magnetic field along a first direction, and magnetoresistive effect elements 201, 202, 401, and 402 that detect a magnetic field along a second direction, thereby making it possible to detect both the magnetic field along the first direction and the magnetic field along the second direction.

[0084] In the rotating machine 1 according to the first embodiment, the magnetic sensor 14 is attached to the housing 15 by fixing the substrate 141 to the housing 15 with a part of the substrate 141 inserted into the through-hole 1522 of the housing 15 and the sensor unit 142 positioned inside the housing 15. This makes it possible to retrofit the magnetic sensor 14 to the rotating machine 1.

[0085] Moreover, the rotating machine 1 according to the first embodiment includes a sealing member 16 that seals the through-hole 1522 when the magnetic sensor 14 is attached to the housing 15. This makes it possible to prevent foreign matter from entering the housing 15.

[0086] (8) Variations The first embodiment is merely one of various embodiments of the present disclosure. Various modifications of the first embodiment are possible depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the first embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0087] In the first embodiment, the rotating machine 1 is an electric motor (motor), but the rotating machine 1 is not limited to being an electric motor and may be, for example, a generator. That is, the rotating machine 1 is an electric motor or a generator.

[0088] In the first embodiment, the rotating machine 1 is an SPM motor, but the rotating machine 1 is not limited to an SPM motor and may be, for example, an IPM (Interior Permanent Magnet) motor. That is, the multiple magnets 122 may be built into the rotor core 121 of the rotor 12.

[0089] In the first embodiment, each of the plurality of magnets 122 is arc-shaped, but each of the plurality of magnets 122 is not limited to being arc-shaped, and may be, for example, flat.

[0090] In the first embodiment, each of the plurality of magnets 122 is a permanent magnet, but each of the plurality of magnets 122 is not limited to being a permanent magnet, and may be, for example, an electromagnet.

[0091] In the first embodiment, the number of the plurality of magnets 122 is eight, but the number of the plurality of magnets 122 is not limited to eight, and may be, for example, four or twelve.

[0092] In embodiment 1, each of the multiple magnets 122 has two magnetized poles in the radial direction of the rotor core 121, but it is sufficient that the outer pole of the two poles is magnetized, and the inner pole does not have to be magnetized.

[0093] In the first embodiment, each of the magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402 is a giant magnetoresistive effect element. However, each of the magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402 is not limited to being a giant magnetoresistive effect element and may be, for example, a tunnel magnetoresistive effect (TMR) element. That is, each of the magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402 is a giant magnetoresistive effect element or a tunnel magnetoresistive effect. Furthermore, each of the magnetoresistive effect elements 101, 102, 201, 202, 301, 302, 401, and 402 may be, for example, an anisotropic magnetoresistive effect (AMR) element.

[0094] In the first embodiment, the sealing member 16 is a molded product made of silicone rubber, but the sealing member 16 may be, for example, a resin molded product. Even in this case, by sealing the through-hole 1522 with the sealing member 16, it is possible to prevent foreign matter from entering the housing 15.

[0095] In the first embodiment, the stator core 111 is formed as a single piece, but the stator core 111 is not limited to being formed as a single piece, and may be divided into a plurality of divided pieces, for example.

[0096] In the first embodiment, the through hole 1522 is provided in the cover 152 of the housing 15, but the through hole may be provided, for example, in the bottom plate 1512 of the case 151 of the housing 15. Even in this case, it is sufficient that the through hole is provided in the bottom plate 1512 of the case 151 at a position facing the rotor core 121 in the axial direction D1 so that the sensor unit 142 of the magnetic sensor 14 and the rotor core 121 of the rotor 12 face each other in the axial direction D1.

[0097] In the first embodiment, the magnetic sensor 14 includes a first half-bridge circuit 10, a second half-bridge circuit 20, a third half-bridge circuit 30, and a fourth half-bridge circuit 40, but the third half-bridge circuit 30 and the fourth half-bridge circuit 40 may be omitted. In other words, the magnetic sensor 14 only needs to include at least the first half-bridge circuit 10 and the second half-bridge circuit 20.

[0098] (Embodiment 2) A rotating machine 1a according to the second embodiment will be described with reference to Fig. 9. Regarding the rotating machine 1a according to the second embodiment, the same components as those of the rotating machine 1 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals, and the description thereof will be omitted.

[0099] 9, the rotating machine 1a according to the second embodiment differs from the rotating machine 1 according to the first embodiment (see FIG. 1) in that the magnetic sensor 14a is entirely housed in a housing 15. The rotating machine 1a according to the second embodiment also differs from the rotating machine 1 according to the first embodiment in that the sensor unit 142 is mounted on one surface 1411 of a substrate 141 via an electrode unit 143 provided on a side surface 1424 of the sensor unit 142.

[0100] 9, the rotating machine 1a according to the second embodiment includes a stator 11, a rotor 12, a rotating shaft 13, a magnetic sensor 14a, and a housing 15. The magnetic sensor 14a includes a substrate 141 and a sensor unit 142.

[0101] The sensor unit 142 includes a plurality of magnetoresistance effect elements 101, 102, 201, 202, 301, 302, 401, and 402 (see FIGS. 4 and 5) formed on a plane 1423 of the substrate 1421, and further includes an electrode unit 143 that electrically connects the sensor unit 142 and the substrate 141. The electrode unit 143 is, for example, solder. The electrode unit 143 is provided on a side surface 1424 of the substrate 1421. The side surface 1424 of the substrate 1421 is a surface that extends from the outer edge of the plane 1423 of the substrate 1421 in a direction intersecting (orthogonal to) the plane 1423. As shown in FIG. 9, the sensor unit 142 is connected to the substrate 141 by the electrode unit 143.

[0102] 9, when the magnetic sensor 14 is housed in the housing 15, the substrate 141 of the magnetic sensor 14 is arranged parallel to the surface 1212 of the rotor 12 facing the magnetic sensor 14. As a result, the plane 1423 of the base material 1421 of the sensor unit 142 of the magnetic sensor 14 is perpendicular to the facing surface 1212.

[0103] In the rotating machine 1a according to the second embodiment, similarly to the rotating machine 1 according to the first embodiment, the magnetic sensor 14a faces the rotor 12 in the axial direction D1 and detects the position of the rotor 12 based on the magnetic fields from the multiple magnets 122 of the rotor 12. Therefore, a position detection magnet for detecting the position of the rotor 12 is not required, and it is possible to omit the position detection magnet.

[0104] In the rotating machine 1a according to the second embodiment, the opposing surface 1212 of the rotor 12 and the plane 1423 of the magnetic sensor 14a are perpendicular to each other, which makes it possible to detect the magnetic field from the multiple magnets 122 of the rotor 12 as at least one of a sine wave and a cosine wave.

[0105] The various configurations described in the second embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first embodiment.

[0106] (Embodiment 3) A rotating machine 1b according to a third embodiment will be described with reference to Fig. 10. Regarding the rotating machine 1b according to the third embodiment, the same components as those of the rotating machine 1 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals, and the description thereof will be omitted.

[0107] 10, the rotating machine 1b according to the third embodiment differs from the rotating machine 1 according to the first embodiment (see FIG. 1) in that the magnetic sensor 14b is entirely housed in the housing 15. The rotating machine 1b according to the third embodiment also differs from the rotating machine 1b according to the first embodiment in that the sensor unit 142 is held between the first substrate 144 and the holding member 145.

[0108] 10, the rotating machine 1b according to the third embodiment includes a stator 11, a rotor 12, a rotating shaft 13, a magnetic sensor 14b, and a housing 15. The magnetic sensor 14b includes two substrates 141 and 144, a sensor unit 142, and a holding member 145. That is, the rotating machine 1b according to the third embodiment further includes the holding member 145 that holds the magnetic sensor 14b.

[0109] Substrate 144 is a flexible substrate that is flexible in the thickness direction of substrate 144. Substrate 144 has one surface 1441. Substrate 144 is connected to substrate 141. That is, in rotating machine 1b according to embodiment 3, substrate 144 is the first substrate, and substrate 141 is the second substrate.

[0110] The holding member 145 is made of, for example, an electrically insulating material (e.g., synthetic resin) and has an L-shaped cross section. The holding member 145 is a member for holding the sensor unit 142 between itself and the above-described substrate 144. That is, as shown in FIG. 10 , the holding member 145 holds the sensor unit 142 between itself and the substrate 144, which is bent into an L-shaped cross section. More specifically, the holding member 145 and the substrate (first substrate) 144 hold the sensor unit 142 so as to sandwich the sensor unit 142 in the orthogonal direction D2. The orthogonal direction D2 is a direction orthogonal to the axial direction D1. When the sensor unit 142 is held by the holding member 145 and the substrate 144, a surface 1212 of the rotor 12 facing the magnetic sensor 14b and a flat surface 1423 of a base material 1421 of the sensor unit 142 are orthogonal to each other.

[0111] In the rotating machine 1b according to the third embodiment, similarly to the rotating machine 1 according to the first embodiment, the magnetic sensor 14a faces the rotor 12 in the axial direction D1 and detects the position of the rotor 12 based on the magnetic fields from the multiple magnets 122 of the rotor 12. Therefore, a position detection magnet for detecting the position of the rotor 12 is not required, and it is possible to omit the position detection magnet.

[0112] In the rotating machine 1b according to the third embodiment, the opposing surface 1212 of the rotor 12 and the plane 1423 of the magnetic sensor 14b are perpendicular to each other, which makes it possible to detect the magnetic field from the multiple magnets 122 of the rotor 12 as at least one of a sine wave and a cosine wave.

[0113] The various configurations described in the third embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first and second embodiments.

[0114] (Aspect) The present specification discloses the following aspects.

[0115] A rotating machine (1; 1a; 1b) according to a first aspect includes a stator (11), a rotor (12), a rotating shaft (13), and magnetic sensors (14; 14a; 14b). The rotor (12) rotates relative to the stator (11). The rotating shaft (13) is connected to the rotor (12) and rotates in conjunction with the rotation of the rotor (12). The magnetic sensors (14; 14a; 14b) detect the position of the rotor (12). The rotor (12) has a plurality of magnets (122). The magnetic sensors (14; 14a; 14b) face the rotor (12) in an axial direction (D1) that is parallel to the rotating shaft (13), and detect the position of the rotor (12) based on magnetic fields from the plurality of magnets (122) of the rotor (12).

[0116] According to this embodiment, the magnetic sensors (14; 14a; 14b) detect the position of the rotor (12) based on the magnetic fields from the plurality of magnets (122) of the rotor (12), so that it is possible to omit a magnet for position detection.

[0117] In a rotating machine (1; 1a; 1b) according to the second aspect, the magnetic sensors (14; 14a; 14b) in the first aspect have magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) formed on the same plane (1423). In this rotating machine (1; 1a; 1b), a surface (1212) of the rotor (12) facing the magnetic sensors (14; 14a; 14b) is perpendicular to the plane (1423) of the magnetic sensors (14; 14a; 14b).

[0118] According to this embodiment, the opposing surface (1212) of the rotor (12) and the plane (1423) of the magnetic sensor (14; 14a; 14b) are perpendicular to each other, so that the magnetic field from the multiple magnets (122) of the rotor (12) can be detected as a sine wave or cosine wave.

[0119] A rotating machine (1; 1a; 1b) according to a third aspect is the second aspect and includes a plurality of magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402). The plurality of magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) include first magnetoresistive effect elements (101, 102, 301, 302) and second magnetoresistive effect elements (201, 202, 401, 402). The first magnetoresistive effect elements (101, 102, 301, 302) detect a magnetic field along a first direction perpendicular to a plane (1423) of the magnetic sensor (14; 14a; 14b). The second magnetoresistance effect elements (201, 202, 401, 402) detect a magnetic field along a second direction that is perpendicular to the plane (1423) of the magnetic sensor (14; 14a; 14b) and perpendicular to the first direction.

[0120] According to this aspect, it is possible to detect both a magnetic field along the first direction and a magnetic field along the second direction.

[0121] In a rotating machine (1; 1a; 1b) according to a fourth aspect, in the third aspect, each of the plurality of magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) is a giant magnetoresistive effect element or a tunneling magnetoresistive effect element.

[0122] According to this embodiment, it is possible to improve the accuracy of detecting the position of the rotor (12).

[0123] A rotating machine (1) according to a fifth aspect is the rotating machine (1) of any one of the first to fourth aspects, further including a housing (15). The housing (15) houses at least the stator (11) and the rotor (12). The magnetic sensor (14) includes a sensor unit (142) and a substrate (141). The sensor unit (142) has magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) formed on the same plane (1423). The substrate (141) has one surface (1411). The sensor unit (142) is disposed on the one surface (1411) of the substrate (141) so that the plane (1423) is parallel to the one surface (1411) of the substrate (141). The housing 15 has a through-hole 1522 that penetrates the housing 15 in the axial direction D1. The magnetic sensor 14 is attached to the housing 15 by fastening the substrate 141 to the housing 15 with at least a portion of the substrate 141 inserted into the through-hole 1522 and the sensor unit 142 positioned within the housing 15.

[0124] According to this embodiment, the magnetic sensor (14) can be retrofitted to the rotating machine (1).

[0125] The rotating machine (1) according to a sixth aspect is the rotating machine (1) of the fifth aspect, further including a sealing member (16). The sealing member (16) seals the through-hole (1522) when the magnetic sensor (14) is attached to the housing (15).

[0126] According to this embodiment, it is possible to prevent foreign matter from entering the inside of the housing (15).

[0127] A rotating machine (1a) according to a seventh aspect is the rotating machine (1a) of any one of the first to fourth aspects, further including a housing (15). The housing (15) houses at least the stator (11) and the rotor (12). The magnetic sensor (14a) includes a sensor unit (142) and a substrate (141). The sensor unit (142) has magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) formed on the same plane (1423). The substrate (141) has one surface (1411). The sensor unit (142) further includes an electrode unit (143) electrically connecting the sensor unit (142) and the substrate (141). The electrode portion (143) is formed on a side surface (1424) of the sensor portion (142) extending from the outer edge of the flat surface (1423) of the sensor portion (142) in a direction intersecting the flat surface (1423). The substrate (141) is disposed in the housing (15) so as to be parallel to a surface (1212) of the rotor (12) facing the magnetic sensor (14a). The sensor portion (142) is connected to the substrate (141) by the electrode portion (143).

[0128] According to this embodiment, the opposing surface (1212) of the rotor (12) and the plane (1423) of the sensor unit (142) are perpendicular to each other, so that the magnetic field from the multiple magnets (122) of the rotor (12) can be detected as a sine wave or cosine wave.

[0129] A rotating machine (1b) according to an eighth aspect is the rotating machine (1b) of any one of the first to fourth aspects, further including a housing (15) and a holding member (145). The housing (15) houses at least the stator (11) and the rotor (12). The holding member (145) holds the magnetic sensor (14b). The magnetic sensor (14b) includes a sensor unit (142), a first substrate (144), and a second substrate (141). The sensor unit (142) has magnetoresistive effect elements (101, 102, 201, 202, 301, 302, 401, 402) formed on the same plane (1423). The first substrate (144) has one surface (1441). The second substrate (141) is connected to the first substrate (144). The first substrate 144 is a flexible substrate that is flexible in the thickness direction of the first substrate 144. The holding member 145 and the first substrate 144 hold the sensor unit 142 so that a surface 1212 of the rotor 12 that faces the magnetic sensor 14b is perpendicular to a flat surface 1423 of the sensor unit 142.

[0130] According to this embodiment, the opposing surface (1212) of the rotor (12) and the plane (1423) of the sensor unit (142) are perpendicular to each other, so that the magnetic field from the multiple magnets (122) of the rotor (12) can be detected as a sine wave or cosine wave.

[0131] In the rotating machine (1b) according to the ninth aspect, in the eighth aspect, the holding member (145) and the first substrate (144) hold the sensor unit (142) so as to sandwich it from an orthogonal direction (D2) that is a direction perpendicular to the axial direction (D1).

[0132] According to this embodiment, the sensor section (142) can be held by sandwiching the sensor section (142) between the holding member (145) and the first substrate (144).

[0133] In a rotating machine (1) according to a tenth aspect, in any one of the fifth to ninth aspects, a center point (C1) of a plane (1423) of the sensor section (142) is located in the axial direction (D1) between an opposing surface (1212) of the rotor (12) facing the magnetic sensor (14) and a first position (P1) where a distance (L2) from the opposing surface (1212) is 0.8 times the first value (L1), when the outer dimension of the rotor (12) is a first value (L1).

[0134] According to this embodiment, it is possible to improve the detection accuracy of the magnetic sensor (14).

[0135] In the rotating machine (1) according to the eleventh aspect, in any one of the fifth to tenth aspects, the center point (C1) of the plane (1423) of the sensor section (142) is located between the outer edge of the opposing surface (1212) facing the magnetic sensor (14) in the rotor (12) and a second position (P2) where the distance (L4) from the outer edge of the opposing surface (1212) is 0.8 times the second value (L3), in the orthogonal direction (D2) that is perpendicular to the axial direction (D1).

[0136] According to this embodiment, it is possible to improve the detection accuracy of the magnetic sensor (14).

[0137] A rotating machine (1; 1a; 1b) according to a twelfth aspect is used as an electric motor in any one of the first to eleventh aspects.

[0138] According to this embodiment, the rotating machine (1; 1a; 1b) can be used as an electric motor.

[0139] A manufacturing method for a rotating machine (1; 1a; 1b) according to a thirteenth aspect is a manufacturing method for a rotating machine (1; 1a; 1b) including a stator (11), a rotor (12), a rotating shaft (13), and a magnetic sensor (14; 14a; 14b). The rotor (12) rotates relative to the stator (11). The rotating shaft (13) is connected to the rotor (12) and rotates in conjunction with the rotation of the rotor (12). The magnetic sensor (14; 14a; 14b) detects the position of the rotor (12). The rotor (12) has a plurality of magnets (122). The magnetic sensor (14; 14a; 14b) detects the position of the rotor (12) based on a magnetic field from the plurality of magnets (122) of the rotor (12). A method for manufacturing a rotating machine (1; 1a; 1b) includes a step of arranging the magnetic sensors (14; 14a; 14b) so that the magnetic sensors (14; 14a; 14b) face the rotor (12) in an axial direction (D1) that is parallel to the rotation axis (13).

[0140] According to this embodiment, the magnetic sensors (14; 14a; 14b) detect the position of the rotor (12) based on the magnetic fields from the plurality of magnets (122) of the rotor (12), so that it is possible to omit a magnet for position detection.

[0141] A magnetic sensor (14; 14a; 14b) according to a fourteenth aspect is a magnetic sensor (14; 14a; 14b) used in a rotating machine (1; 1a; 1b) including a stator (11), a rotor (12), and a rotating shaft (13). The rotor (12) rotates relative to the stator (11). The rotating shaft (13) is connected to the rotor (12) and rotates in conjunction with the rotation of the rotor (12). The rotor (12) has a plurality of magnets (122). The magnetic sensor (14; 14a; 14b) faces the rotor (12) in an axial direction (D1) that is parallel to the rotating shaft (13), and detects the position of the rotor (12) based on a magnetic field from the plurality of magnets (122) of the rotor (12).

[0142] According to this embodiment, the magnetic sensors (14; 14a; 14b) detect the position of the rotor (12) based on the magnetic fields from the plurality of magnets (122) of the rotor (12), so that it is possible to omit a magnet for position detection.

[0143] The configurations according to the second to twelfth aspects are not essential for the rotating machine (1; 1a; 1b) and can be omitted as appropriate. [Explanation of symbols]

[0144] 1,1a,1b Rotating machine 11 Stator 12 rotors 122 Magnet 1212 Opposite surface 13 Rotation axis 14, 14a, 14b Magnetic sensors 141 Substrate (Second Substrate) 1411 First Face 142 Sensor unit 1423 planes (planes) 1424 Side 143 Electrode section 144 Board (1st board) 1441 First Face 145 Retaining member 101, 102, 301, 302 magnetoresistive element (first magnetoresistive element) 201, 202, 401, 402 magnetoresistive element (second magnetoresistive element) 15 Case 1522 Through hole 16 Sealing member C1 center point D1 Axial direction D2 Orthogonal direction L1 First value L2 First line segment (distance) L3 Second Value L4 Second line segment (distance) P1 1st position P2 2nd position

Claims

1. a stator; a rotor that rotates relative to the stator; a rotating shaft connected to the rotor and rotating in accordance with the rotation of the rotor; a magnetic sensor for detecting the position of the rotor; a housing that houses at least the stator and the rotor, The rotor has a plurality of magnets, The magnetic sensor a sensor unit having a magnetoresistive effect element formed on the same plane; a substrate having a surface; the sensor unit is disposed on the one surface of the substrate so that the plane is parallel to the one surface of the substrate; the housing has a through-hole that penetrates the housing in an axial direction that is a direction parallel to the rotation axis, the magnetic sensor is attached to the housing by fixing the substrate to the housing in a state where at least a portion of the substrate is inserted into the through-hole and the sensor unit is positioned inside the housing, a sealing member that seals the through-hole when the magnetic sensor is attached to the housing; the magnetic sensor faces the rotor in the axial direction and detects the position of the rotor based on magnetic fields from the plurality of magnets of the rotor. Rotating machine.

2. The magnetic sensor has magnetoresistive elements formed on the same plane, a surface of the rotor facing the magnetic sensor and the plane of the magnetic sensor are perpendicular to each other; The rotating machine according to claim 1 .

3. a plurality of the magnetoresistive effect elements; The plurality of magnetoresistive effect elements are a first magnetoresistive element configured to detect a magnetic field along a first direction perpendicular to the plane of the magnetic sensor; a second magnetoresistive element configured to detect a magnetic field along a second direction perpendicular to the plane of the magnetic sensor and perpendicular to the first direction; The rotating machine according to claim 2 .

4. Each of the plurality of magnetoresistive effect elements is a giant magnetoresistive effect element or a tunnel magnetoresistive effect element. The rotating machine according to claim 3 .

5. The center point of the plane of the sensor unit is In the axial direction, when an outer dimension of the rotor is defined as a first value, the magnetic sensor is located between a surface of the rotor facing the magnetic sensor and a first position where a distance from the facing surface is 0.8 times the first value. The rotating machine according to any one of claims 1 to 4.

6. The center point of the plane of the sensor unit is In an orthogonal direction that is a direction orthogonal to the axial direction, when a distance from an outer edge of a surface of the rotor facing the magnetic sensor to the rotation axis is defined as a second value, the magnetic sensor is located between the outer edge of the facing surface and a second position where the distance from the outer edge of the facing surface is 0.8 times the second value. The rotating machine according to any one of claims 1 to 5.

7. Used as an electric motor, The rotating machine according to any one of claims 1 to 6.

Images