motor

Abstract

To provide a motor using a photosensor suitable for a vehicle.SOLUTION: A motor comprises: a diffuser which is provided on a motor shaft and diffuses or reflects light; a light emitting part which ejects light to the diffuser; a sheet which has a light passage / block place arranged between the diffuser and a light receiving part; the light receiving part which detects light passing through a light passage place of the light passage / block place; and a filling member which is filled between the light emitting part and the diffuser and between the sheet and the light receiving part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a motor. [Background technology]

[0002] Conventionally, there is known a technique for detecting the rotation of a motor using an optical sensor (see, for example, Patent Document 1). The motor in Patent Document 1 detects light emitted from a light-emitting device (optical module) that generates light to detect the rotation of the motor. In general, using an optical sensor for detecting the rotation of the motor allows for more accurate detection of the rotation of the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 203314 Summary of the Invention [Problem to be solved by the invention]

[0004] However, some motors used in vehicles are oil-cooled motors that use oil to cool the motor and lubricate the motor shaft bearings. Even in such oil-cooled motors, the optical sensor must be positioned so that it can function. Furthermore, motors used in vehicles must continue to detect motor rotation even if dust or dirt adheres to the motor.

[0005] An object of the present disclosure is to provide a motor using an optical sensor suitable for a vehicle. [Means for solving the problem]

[0006] The motor according to the present disclosure comprises a scatterer provided on a motor shaft for scattering or reflecting light, a light-emitting unit for emitting light toward the scatterer, a sheet having light-transmitting / light-blocking areas for transmitting or blocking light scattered or reflected by the scatterer, a light-receiving unit for detecting light that has passed through the light-transmitting areas of the light-transmitting / light-blocking areas, and a filling member filled between the light-emitting unit and the scatterer, and between the sheet and the light-receiving unit.

[0007] With this motor, light passes through the scattering device and exits the area where the sheet passes. The light emitted from the area where the sheet passes is detected by the light receiving unit. A filling material is placed between the sheet and the light receiving unit. This prevents dust, dirt, motor cooling and lubricating oil, etc. from getting between the light receiving unit and the sheet. As a result, it is possible to prevent the light emitted from the sheet from being refracted or attenuated by dust, dirt, oil, etc., which can lead to false detection by the light receiving unit. [Effects of the Invention]

[0008] According to the present disclosure, a motor using an optical sensor suitable for a vehicle can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall view of a motor according to an embodiment of the present disclosure. [Figure 2] 10A and 10B are diagrams illustrating the positional relationship between a sheet passing / blocking point and a light receiving unit of a motor according to an embodiment of the present disclosure. [Figure 3] FIG. 1 shows a modified example of the light-emitting unit, the scattering unit and the light-receiving unit of the motor according to another embodiment. [Figure 4] FIG. 2 shows a modified example of the light-emitting unit, the scatterer and the light-receiving unit of the motor according to another embodiment. [Figure 5] FIG. 3 shows a modified example of the light-emitting unit, the scatterer and the light-receiving unit of the motor according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present disclosure will be described below with reference to the drawings. In the following specification and drawings, the output side of the motor 1 in the thrust direction (axial direction) of the motor shaft 2 will be referred to as the rear side, and the opposite side will be referred to as the front side. Regarding the left-right direction, the left side of the paper when viewed from the front will be referred to as the left, and the right side will be referred to as the right.

[0011] As shown in FIG. 1, the motor 1 includes a motor shaft 2, a stator coil 4, a rotor 6, a diffuser 8, a light emitter 10, a sheet 12, a filling member 14, a light receiver 16, a first chamber 18, a second chamber 20, a sealing member 22, a reservoir tank 24, and an oil circulation passage 26. The motor 1 of this embodiment is a three-phase AC motor connected to a drive battery (not shown) mounted on a vehicle via an inverter (not shown). The vehicle may be a plug-in hybrid vehicle (PHEV) or an electric vehicle capable of external charging or external power supply. The inverter converts DC current from the drive battery into three-phase AC current and supplies it to the motor 1. A device such as a transaxle is connected to the output side of the motor 1, transmitting the output of the motor 1 to a drive shaft (not shown) connected to drive wheels (not shown).

[0012] The motor shaft 2 is a shaft that rotatably supports the rotor 6. The motor shaft 2 is rotatably supported by a first bearing 2a located in front of the rotor 6 and a second bearing 2b located in the rear. The stator coil 4 is fixed to a housing that forms the first chamber 18 of the motor 1, and receives power from the inverter, generating a magnetic force that rotates the rotor 6. The rotor 6 has permanent magnets on the surface of its cylindrical portion or inside it.

[0013] The motor 1 is divided into a first chamber 18 that houses the motor shaft 2, first bearing 2a, second bearing 2b, rotor 6, and stator coil 4, and a second chamber 20 that houses the scatterer 8, light emitter 10, and light receiver 16. The first chamber 18 is made of a material such as die-cast aluminum and constitutes the housing of the motor 1. The second chamber 20 is formed by providing a partition wall, using a seal or other material, between the first chamber 18 and the space through which the motor shaft passes. The oil circulation passage 26 is a passage that supplies oil to the first chamber 18. The oil supplied to the first chamber 18 lubricates the first bearing 2a and second bearing 2b and cools the rotor 6 and stator coil 4. In other words, the motor 1 is an oil-cooled motor. The space between the first chamber 18 and the output side of the motor shaft 2 is sealed by a sealing member 22, and the space between the first chamber 18 and the second chamber 20 is also sealed by a sealing member 22, thereby preventing oil supplied to the first chamber 18 from leaking out to the output side of the motor shaft 2 or the second chamber 20.

[0014] The scatterer 8 scatters or reflects light emitted from the light-emitting unit 10. The scatterer 8 includes a convex mirror 8a, multiple prisms 8b, and a disk-shaped plate 8c. In this embodiment, the convex mirror 8a has a shape in which the center of the disk-shaped mirror protrudes forward in the thrust direction. The convex mirror 8a is positioned so that the center of the convex mirror 8a coincides with the center of the plate 8c so that light reaching the scatterer 8 is scattered or reflected and reaches the prism 8b. Note that the convex mirror 8a does not have to be a convex mirror; a mirror or prism that can achieve the same effect may also be used. The multiple prisms 8b are concentrically arranged within or on the plate 8c. The light emitted from the light-emitting unit 10 is scattered or reflected by the convex mirror 8a in the circumferential direction of the plate 8c, where the light-receiving unit 16 is located, and reaches the multiple prisms 8b. The light that reaches the prism 8b is split by the prism 8b it first encounters into light that passes through the prism and light reflected toward the light-receiving unit 16. The light that passes through the first prism is split by the next prism, 8b, into light that passes through the prism and light that is reflected toward the light-receiving unit 16. Subsequently, the light is split by each subsequent prism into light that passes through the prism and light that is reflected toward the light-receiving unit 16, and splitting continues in the same manner until the light is split by the last prism. Due to this function, in this embodiment, 12 prisms are arranged concentrically, and 12 reflected lights that are directed toward the light-receiving unit 16 are obtained. Note that prism 8b, which the light finally reaches, may be replaced with a mirror so that only the reflected light is directed toward the light-receiving unit 16 without being split.

[0015] In this embodiment, the disk-shaped plate 8c is made of a transparent plate such as glass or acrylic. The convex mirror 8a and the multiple prisms 8b are embedded inside the transparent plate 8c. However, the convex mirror 8a and the multiple prisms 8b may be fixed to the metal plate 8c, for example. Also, in this embodiment, the center of the plate 8c is fixed coaxially with the motor shaft 2. In other words, the scatterer 8 is arranged coaxially with the motor shaft 2 and fixed to the motor shaft 2. The scatterer 8 rotates together with the motor shaft 2.

[0016] The light-emitting unit 10 emits light toward the scatterer 8. Specifically, the light-emitting unit 10 emits light toward the convex mirror 8a of the scatterer 8. In this embodiment, the light-emitting unit 10 is a device that emits laser light. The light-emitting unit 10 is arranged so that the light emitted from the laser emitting unit reaches the scatterer 8 and is scattered or reflected by the convex mirror 8a in the circumferential direction of the plate 8c on which the light-receiving unit 16 is located. Note that the light-emitting unit 10 may be any device that can emit highly directional light toward the convex mirror 8a, and may be, for example, an LED light.

[0017] The sheet 12 is disposed between the diffuser 8 and the light-receiving unit 16. The sheet 12 is disposed in front of the diffuser 8 and has a light-transmitting portion that transmits light scattered or reflected by the diffuser 8 and a light-shielding portion that does not transmit light. FIG. 2 is a schematic diagram of the light-receiving unit 16 and the sheet 12 viewed from the front of the motor 1 to illustrate the positional relationship between the light-transmitting / light-shielding portion 12a of the sheet 12 and the light-receiving unit 16 of the motor 1 according to an embodiment of the present disclosure. The enlarged view of FIG. 2 shows an enlarged view of the light-transmitting / light-shielding portion 12a and an enlarged view of the light-receiving element 16a of the light-receiving unit 16. A view of the light-receiving unit as viewed from the rear of the motor 1 before enlarging the light-receiving element 16a is also included. As shown in FIG. 2, the sheet 12 has a light-transmitting / light-shielding portion 12a (an example of a light-transmitting / light-shielding portion in the claims; in this embodiment, the white portion is the light-transmitting portion and the gray portion is the light-shielding portion) and a central hole 12b through which light can pass. In this embodiment, the sheet 12 is a black, disk-shaped sheet. However, the sheet 12 can be changed to any material that does not transmit or transmit light except at the passing points of the light-transmitting / light-blocking areas 12a and the central hole 12b. Light scattered or reflected by the scatterer 8 and dispersed by the prism 8b toward the light-receiving unit 16 (light reflected by the prism 8b) passes through the passing points of the light-transmitting / light-blocking areas 12a. Light emitted from the light-emitting unit 10 toward the scatterer 8 passes through the central hole 12b. The sheet 12 may be a rigid body that can maintain its shape independently, or a material, film, or coating that is intended to be adhered to the surface of the scatterer 8. If the sheet 12 is a rigid body that can maintain its shape independently, it is fixed to the scatterer 8. The passing points of the light-transmitting / light-blocking areas 12a and the central hole 12b may be hollow, but if the sheet 12 is a rigid body that can maintain its shape independently, the central hole 12b, through which light can pass, is not hollow but is made of a transparent rigid body such as glass or acrylic.

[0018] As shown in FIG. 1 , the filling member 14 is a member filled between the light-emitting unit 10 and the scattering unit 8, and between the sheet 12 and the light-receiving unit 16. In this embodiment, the filling member 14 is a transparent fluorine-based inert liquid filled in the second chamber 20. In this embodiment, a reservoir tank 24 is connected to the upper side of the second chamber 20 via a connecting passage 24a. The transparent fluorine-based inert liquid filled in the reservoir tank 24 fills the second chamber 20 and is pressurized by its own weight due to gravity. The second chamber 20 has an insertion hole through which the motor shaft 2 is inserted toward the first chamber 18. An annular seal member 22, through which the motor shaft 2 is inserted, is disposed between the insertion hole and the periphery of the motor shaft 2. The seal member 22 separates the first chamber 18 from the second chamber 20. In this embodiment, the seal member 22 is a rubber seal.

[0019] The light receiving unit 16 detects light that has passed through the light passing / blocking area 12a. The light receiving unit 16 is, for example, an optical sensor having a light receiving element 16a. As shown in FIGS. 1 and 2, the light receiving unit 16 is disposed in front of the light passing / blocking area 12a. In this embodiment, the light receiving unit 16 has twelve light receiving elements 16a arranged in series in the radial direction of the sheet 12. Each light receiving element 16a receives light and emits a signal when the light passing / blocking area 12a of the sheet 12 directly faces the rear side of the light receiving element 16a, but does not receive light and does not emit a signal when the light blocking area directly faces the rear side of the light receiving element 16a. When the generation or absence of a signal from this light receiving element 16a is recognized as 1 or 0, a binary 12-bit signal is generated according to the state of the light passing / blocking area 12a directly facing the rear side of the light receiving unit 16. By utilizing this, and providing 2^12 (4096) different light-transmitting / light-shielding points 12a on the sheet 12, the rotation angle of the rotor 6 can be detected with high accuracy up to 360 / 4096 (≒0.08789) degrees.

[0020] According to this motor 1, light passes through the scattering device 8 and passes through the light-transmitting / light-shielding area 12a of the sheet 12. The light emitted from the light-transmitting / light-shielding area 12a of the sheet 12 is detected by the light-receiving unit 16. A filling member 14 is filled between the sheet 12 and the light-receiving unit 16. This prevents dust, dirt, oil in the first chamber 18, and the like from getting between the light-receiving unit 16 and the sheet 12. As a result, it is possible to prevent the light emitted from the sheet 12 from being refracted or dimmed by dust, dirt, oil, and the like, which could lead to false detection by the light-receiving unit 16. In addition, the filling member 14 is also filled between the light-emitting unit 10 and the scattering device 8. This prevents the light emitted from the light-emitting unit 10 from being refracted or dimmed.

[0021] Furthermore, in this embodiment, the first chamber 18 and the second chamber 20 are separated, and a transparent fluorine-based inert liquid is filled into the second chamber 20. As a result, the pressure due to the weight of the transparent fluorine-based inert liquid improves the sealing performance of the seal member 22 on the second chamber 20 side, which separates the first chamber 18 from the second chamber 20. This further prevents oil from entering the second chamber 20, even if the motor 1 is an oil-cooled motor. This further prevents the transparent fluorine-based inert liquid from becoming contaminated. As a result, light emitted from the sheet 12 is further prevented from being refracted or dimmed by the oil that has entered the sheet 12. This makes it easier to prevent erroneous detection by the light receiving unit 16.

[0022] As described above, according to the present disclosure, it is possible to provide a motor 1 that uses an optical sensor suitable for a vehicle.

[0023] <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various modifications are possible within the scope of the gist of the invention. In particular, the multiple modifications described in this specification can be combined as needed.

[0024] (a) In the above embodiment, an example was described in which the second chamber 20 was filled with a transparent fluorine-based inert liquid as the filling member 14, but the present disclosure is not limited to this. For example, the filling member 14 may be filled with a transparent gas that does not contain dust, dirt, or moisture, and the second chamber 20 may be sealed. In the case of a gas, the reservoir tank 24 functions as an inlet and outlet for the gas.

[0025] (b) In the above embodiment, a rubber seal is used as the seal member 22, but it may be a resin member or a seal member with a mechanical structure.

[0026] (c) In the above embodiment, the scatterer 8 is described as rotating together with the motor shaft 2, but the present disclosure is not limited to this. The scatterer 8 does not necessarily have to rotate together with the motor shaft 2. For example, the scatterer 8 may be rotatably mounted on the motor shaft 2, but may not rotate, or the scatterer 8 may be fixed to the light-emitting unit 10 side, as shown in FIG. 3. In this case, the sheet 12 is not adhered to the rotating scatterer 8, but is fixed to the motor shaft 2.

[0027] (d) Furthermore, as shown in Figure 4(i), the convex mirror 8a of the diffuser 8 may be provided on the side of the light-emitting unit 10 that extends to the position of the convex mirror 8a. Alternatively, as shown in Figure 4(ii), light may be emitted directly to the prism 8b from the light-emitting unit 10 that extends to the position of the convex mirror 8a in Figure 4(i) in the circumferential direction of the plate 8c where the light-receiving unit 16 is located, as shown by the arrow in Figure 4(ii).

[0028] (e) Figure 5(i) is a diagram showing a modified example of the light-emitting unit 10, the diffuser 8, and the light-receiving unit 16 of a motor according to another embodiment. The enlarged view of Figure 5(ii) shows an enlarged view of the light-emitting element 10a of the light-emitting unit 10 as viewed from the front of the motor 1, and an enlarged view of the light-receiving element 16a of the light-receiving unit 16 as viewed from the rear of the motor 1. Also shown are an unenlarged view of the light-emitting unit 10 as viewed from the front of the motor 1 and an unenlarged view of the light-receiving unit 16 as viewed from the rear of the motor 1. As shown in Figure 5(i), the light-emitting unit 10 according to a modified example of the present disclosure may be extended to a position directly facing the light-transmitting / light-blocking area 12a of the sheet 12, so that light is emitted directly from the light-emitting unit 10 toward the light-receiving unit 16. In this case, the light-emitting unit 10 may have 12 light-emitting elements 10a arranged in series at a position directly facing the light-transmitting / light-blocking area 12a of the sheet 12. Alternatively, one or more light-emitting elements may be arranged to emit light toward the light-receiving unit 16 from the same 12 positions. The light receiving unit 16 may have 12 light receiving elements 16a arranged in series at a position directly opposite the light passing / blocking areas 12a of the sheet 12, and may generate 2 to the power of 12 different signals according to the 2 to the power of 12 different states of the light passing / blocking areas 12a. [Explanation of symbols]

[0029] 1: Motor 2: Motor shaft 2a: First bearing 2b: Second bearing 4: Stator coil 6: Rotor 8: Scatterer 10: Light emitting part 12: Sheet 12a: Passage and light blocking area 14: Filler material 16: Light receiving part 18: Room 1 20: 2nd room 22: Sealing material 24: Reservoir tank 26: Oil circulation passage 27: Electric oil pump

Claims

1. a diffuser provided on the motor shaft for scattering or reflecting light; a light emitting unit that emits light toward the diffuser; a sheet having a light-transmitting and light-shielding portion including a light-transmitting portion that transmits light scattered or reflected by the scatterer and a light-shielding portion that does not transmit the light; a light receiving unit that detects light that has passed through the passage portion; a filler member that is filled between the light-emitting unit and the diffuser, and between the sheet and the light-receiving unit; A stator coil; A rotor, a bearing for the motor shaft; a first chamber that houses the stator coil, the rotor, and the bearing; a second chamber that houses the scatterer, the light emitting unit, and the light receiving unit; a reservoir tank connected to the second chamber and into which the filling member is injected; A motor comprising:

2. The light emitting unit emits light toward the motor shaft. The motor according to claim 1 .

3. The first chamber contains oil that cools the rotor and the stator coil and lubricates the bearings.

3. The motor according to claim 1 or 2.

4. The second chamber is filled with a transparent liquid or a transparent gas as the filling member. The motor according to any one of claims 1 to 3.

5. a seal member that separates the first chamber from the second chamber and seals a space through which the motor shaft is inserted; The motor according to any one of claims 1 to 4.

6. the diffuser includes a plurality of prisms and a disk-shaped plate; the plurality of prisms are concentrically arranged on the disk-shaped plate; the light-emitting portion extends toward the center of the disk-shaped plate and to the center position of the prism, The light emitting unit emits light directly to the plurality of prisms. The motor according to any one of claims 1 to 5.

7. a light-emitting unit that emits light; a sheet having a light-transmitting / light-shielding portion including a light-transmitting portion that transmits light emitted from the light-emitting portion and a light-shielding portion that does not transmit light; a light receiving unit that detects light that has passed through the passage portion; a filling member filled between the sheet and the light receiving unit; A stator coil; A rotor, a bearing for a motor shaft; a first chamber that houses the stator coil, the rotor, and the bearing; a second chamber that houses the light-emitting unit and the light-receiving unit; a reservoir tank connected to the second chamber and into which the filling member is injected; Equipped with A motor that extends the light-emitting portion to a position directly opposite the light-transmitting shielding portion of the sheet, and the light-emitting portion emits light directly to the light-receiving portion.

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