ELECTRIC COMPRESSOR

Abstract

This electric compressor comprises: an electric motor; a rotating shaft driven by the electric motor; an impeller mounted on one side of the rotating shaft; and a housing comprising an inlet flow channel for guiding gas to the impeller, the inlet flow channel guiding gas from the outside to the inside in the radial direction. The housing includes an inner wall surface axially opposite the side on which the impeller of the inlet flow channel is positioned, and a guide projection extending from the inner wall surface toward the impeller.The electric compressor further comprises a sensor on one side for capturing information about the rotating shaft, wherein the sensor on one side is at least partially embedded in the guide projection of one side.

Description

Technical field

[0001] The present disclosure relates to an electric compressor. State of the art

[0002] There is a turbocharger that includes a compressor impeller mounted on one side of a rotating shaft and a turbine wheel mounted on the other side of the rotating shaft. There is also a turbocharger that includes an air intake flow path for guiding air to a compressor impeller along the axial direction of the rotating shaft (see PTL 1). A rotation sensor for detecting rotation of the rotating shaft may be installed in the turbocharger.

[0003] In a turbocharger disclosed in PTL 1, a rotation sensor for detecting rotation of a rotating shaft is arranged in front of an end section to which a compressor impeller of the rotating shaft is attached, and a cable connected to the rotation sensor and a carrier body that carries the cable cross an air inlet flow path along a radial direction. List of citations from patent literature

[0004] [PTL 1] Chinese patent application publication no. 103899411 Summary of the invention: Technical problem

[0005] There is an electric turbocharger for a fuel cell. The electric turbocharger includes the compressor impeller, the turbine wheel, a pair of bearings arranged to be separated from each other between the compressor impeller and the turbine wheel, and supporting a rotating shaft so that it can rotate, and an electric motor positioned between the pair of bearings to drive the rotating shaft. If a rotation sensor is installed between the pair of bearings to detect rotation of the rotating shaft, the motor shaft length, i.e., the length between the pair of bearings, can increase, thereby increasing the risk of shaft vibration in the electric turbocharger. Furthermore, if the rotation sensor is installed upstream of an end section of the rotating shaft to which the compressor impeller is attached, as in the turbocharger disclosed in PTL 1, there is no possibility of the motor shaft length increasing.However, since a cable or similar component of the rotary sensor can obstruct the flow of air through the air intake flow path, there is a possibility that the performance of the air intake flow path may deteriorate.

[0006] In view of the circumstances described above, at least one embodiment of the present disclosure aims to provide an electric compressor that can acquire information about a rotating body of an electric compressor while suppressing deterioration of performance in a flow path of the electric compressor and an increase in a motor shaft length. Solution to the problem

[0007] According to at least one embodiment of the present disclosure, an electric compressor is provided comprising an electric motor, a rotating shaft configured to be driven by the electric motor, an impeller of one side attached to the rotating shaft on one side of the rotating shaft, and a housing of one side accommodating the impeller of one side and containing an inlet flow path of one side for guiding a gas to the impeller of one side, wherein the inlet flow path of one side is configured to guide the gas from an outside to an inside in a radial direction.The housing of one side comprises an inner wall surface of one side, which is axially opposite a side on which the impeller of one side of the inlet flow path of one side is located, and a guide projection section of one side that projects from the inner wall surface of one side towards the impeller of one side. The electric compressor further comprises at least one sensor of one side for acquiring information about the rotating shaft, wherein the at least one sensor of one side is at least partially embedded in the guide projection section of one side. Advantageous effects of the invention.

[0008] According to at least one embodiment of the present disclosure, an electric compressor is provided which can acquire information about a rotating body of the electric compressor, while suppressing deterioration of performance in a flow path of the electric compressor and an increase in a motor shaft length. Brief description of the drawings Fig. Figure 1 is a schematic view of a fuel cell system comprising an electric compressor according to an embodiment of the present disclosure. Fig. Figure 2 is a schematic view of the fuel cell system, which includes the electric compressor according to the embodiment of the present disclosure. Fig. Figure 3 is a schematic view of the fuel cell system, which includes the electric compressor according to the embodiment of the present disclosure. Fig. Figure 4 is a schematic sectional view along an axial direction in the vicinity of an impeller on one side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 5 is a schematic sectional view along the axial direction in the vicinity of the impeller on one side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 6 is a schematic sectional view along the axial direction in the vicinity of the impeller on one side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 7 is a schematic sectional view along the axial direction in a vicinity of the impeller on the other side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 8 is a schematic sectional view along the axial direction in the vicinity of the impeller on the other side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 9 is a schematic sectional view along the axial direction in the vicinity of the impeller on the other side of the electric compressor according to the embodiment of the present disclosure. Fig. Figure 10 is a schematic sectional view along the axial direction in the vicinity of the impeller on one side of the electric compressor according to the embodiment of the present disclosure. Description of embodiments

[0009] Some embodiments of the present disclosure are described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of components described as embodiments or shown in the drawings are not intended to limit the scope of protection of the present disclosure and are merely examples used to describe the present disclosure. (Electric compressor)

[0010] Fig. Figures 1 to 3 are schematic views of a fuel cell system 100 which includes an electric compressor 1 according to an embodiment of the present disclosure. Fig. Figures 1 to 3 show schematic sectional views along an axial direction of the electric compressor 1. According to some embodiments, the electric compressor 1 is a device for compressing a gas (for example, air) that is to be introduced into a fuel cell 101. For example, the fuel cell 101 contains a solid oxide fuel cell (SOFC) and includes a solid electrolyte provided between an air electrode and a fuel electrode. The fuel cell system 100 includes the electric compressor 1 and the fuel cell 101. For example, the fuel cell system 100 is mounted in a moving vehicle (fuel cell vehicle).

[0011] The electric compressor 1 of the present disclosure can compress the gas to be introduced into the fuel cell 101 and is based on a single-stage electric compressor (see Fig. 1), a multi-stage (two-stage) electric compressor (see Fig. 2) and an electric turbocharger (see Fig. 3) applicable.

[0012] As in Fig. As shown in Figures 1 to 3, the electric compressor 1 comprises at least one electric motor 2, a rotating shaft 3 configured to be driven by the electric motor 2, an impeller 4 mounted on one side of the rotating shaft 3, and a housing 5 that accommodates the impeller 4. Compressed air (compressed gas) compressed by the impeller 4 of the electric compressor 1 is supplied to the fuel cell 101 via compressed gas supply lines 102 and 102A. The compressed gas supply lines 102 and 102A are supply systems through which the compressed gas can flow and are formed, for example, by a pipe or the like.

[0013] Below, a direction of extension of a central axis CA of the rotating shaft 3 is defined as an axial direction of the rotating shaft 3 (up-down direction in Fig. 1 to 3), a direction perpendicular to the central axis CA is defined as a radial direction of the rotating shaft 3, and a circumferential direction around the central axis CA is defined as a circumferential direction of the rotating shaft 3. In the present disclosure, the axial direction, the radial direction, and the circumferential direction of the rotating shaft 3 can each simply be referred to as the axial direction, the radial direction, and the circumferential direction. One side (underside in Fig. 1 to 3) and the other side (top in Fig. 1 to 3) in the axial direction of the rotating shaft 3 can simply be referred to as one side and the other side. In the present disclosure, the term “along a certain direction” includes not only a specific direction but also a direction inclined with respect to the specific direction within a range of ± 15°. (Electric motor)

[0014] The electric motor 2 is driven by receiving electrical energy from an electrical energy source (not shown) and is configured to rotate the rotating shaft 3. As shown in Fig. As shown in Figures 1 to 3, the electric motor 2 comprises a rotor 21, which is a rotor attached to the rotating shaft 3, and a stator 22, which is a stator arranged to face the rotor 21, with a gap between the rotor 21 and the stator 22 on an outer circumferential side of the rotor 21. The rotor 21 is a rotor assembly attached to an outer circumferential section of the rotating shaft 3 and contains several permanent magnets 23. The stator 22 is configured to generate a magnetic field for rotating the rotor 21, which is equipped with the several permanent magnets 23, by using electrical energy supplied by an electrical power supply (not shown). When the rotor 21 is rotated by the magnetic field generated by the stator 22 (energy generated by the electric motor 2), the rotating shaft 3 is rotated. The fuel cell 101 can also be used as the electrical energy source for the electric motor 2. (Bearings and bearing housings)

[0015] In the embodiment shown in the drawings, the electric compressor 1 further comprises several bearings (plain bearings) 11 and 12, which support the rotating shaft 3 so that it is rotatable, and a bearing housing 13. The several bearings 11 and 12 include a bearing 11 on one side, which is arranged on one side of the rotating shaft 3 in the axial direction with respect to the electric motor 2, and the bearing 12 on the other side, which is arranged on the other side with respect to the electric motor 2. In the embodiment shown in Fig. In the embodiment shown in Figures 1 to 3, air bearings are used for bearing 11 on one side and bearing 12 on the other side to avoid the possibility of impurities being mixed with the compressed air supplied to the fuel cell.

[0016] The bearing housing 13 accommodates the multiple bearings 11 and 12, the rotor 21, the stator 22, and the rotating shaft 3 of the electric motor 2. The bearing housing 13 supports the multiple bearings 11 and 12 and the stator 22. (Wheel on one side)

[0017] The impeller 4 of one side is mounted on one side relative to the bearing 11 of the rotating shaft 3. The bearing 11 of one side is arranged between the electric motor 2 and the impeller 4 of one side in the axial direction of the rotating shaft 3. In the embodiment shown in the drawings, the impeller 4 of one side is a centrifugal impeller configured to guide air, which is directed radially outwards from one side, along the axial direction.

[0018] The impeller 4 of one side is an open impeller comprising a hub 41 mechanically coupled to the rotating shaft 3 and several impeller blades 43 provided on an outer circumferential surface 42 of the hub 41. The impeller 4 of one side can be rotated integrally with the rotating shaft 3 about the central axis CA of the rotating shaft 3. A gap (clearance) is formed between each of the tips (tip-side ends) 44 of the several impeller blades 43 of the impeller 4 of one side and a casing surface 50, which is curved in a projecting shape within the housing 5 of one side.

[0019] In the embodiment shown in the drawings, the radial distance of the outer circumferential surface 42 of the hub 41 from the central axis CA of the rotating shaft 3 increases from one side (the side separated from the electric motor 2) to the other side (the side of the electric motor 2). The hub 41 includes an inner circumferential surface 45 for forming a through-hole into which the rotating shaft 3 is inserted along the axial direction. (One side of the casing)

[0020] As in Fig. As shown in Figures 1 to 3, the housing 5 on one side includes an inlet 51 for introducing air (gas) from the outside to an inside of the housing 5 and a discharge port 52 for releasing the compressed air (compressed gas) from the inside to the outside of the housing 5. Within the housing 5, an inlet flow path 53 is formed for guiding the air, which is guided via the inlet 51 to the inside of the housing 5, to the impeller 4, and a screw flow path 54 is formed for guiding the compressed gas, which passes through the impeller 4, to the discharge port 52.

[0021] The inlet flow path 53 of one side is configured to guide air radially from the outside to the inside. The screw flow path 54 of one side has a spiral shape that radially surrounds the outside of the impeller 4 of that side. The inlet 51 and the inlet flow path 53 of one side are each located on one side (the side separated from the electric motor 2) with respect to the outlet 52 and the screw flow path 54 of that side, respectively.

[0022] In the embodiment shown in the drawings, the inlet 51 and the outlet 52 of the housing 5 on one side are each open in a direction that intersects (in the example shown, perpendicular to) the central axis CA of the rotating shaft 3. Since the inlet 51 is open in the direction that intersects the central axis CA of the rotating shaft 3, the length of the inlet flow path 53 on one side can be shortened in the axial direction. Therefore, the electric compressor 1 can be reduced in size and weight.

[0023] In the embodiment shown in the drawings, the housing 5 of one side is mechanically coupled to the bearing housing 13, which is located in a central section of the electric compressor 1 in the axial direction, by a fastening element, such as a fastening bolt. An impeller chamber 55 of one side, which accommodates the impeller 4 of one side in such a way that it is rotatable, is formed by combining the housing 5 of one side and another element (bearing housing 13 in the example shown). The impeller chamber 55 of one side communicates with the inlet flow path 53 of one side, which is located on an upstream side in the direction of airflow, and with the screw flow path 54 of one side, which is located on a downstream side in the direction of airflow. A sheathing surface 50 defines a section of the impeller chamber 55 of one side.

[0024] In housing 5 on one side, the air guided from the inlet flow path 53 on one side to the impeller 4 on one side is compressed by the rotation of the impeller 4 on one side, then flows through the screw flow path 54 on one side and is discharged from the outlet port 52. In the Fig. 1 and Fig. In the embodiment shown in Figure 3, one end of the supply line 102 for compressed gas is connected to the delivery port 52, and the other end is connected to the fuel cell 101.

[0025] The housing 5 on one side comprises an inner wall surface 56, which is axially opposite the side on which the impeller 4 of the inlet flow path 53 of the other side is located (the side separated from the electric motor 2), and a guide projection section 57 of the other side, which projects from the inner wall surface 56 of the other side towards the impeller 4 of the other side. In the embodiment shown in the drawings, the housing 5 on one side further comprises an inner circumferential wall surface 58, which defines an outer surface (outer circumferential side) of the inlet flow path 53 of the other side in the radial direction, and the inner wall surface 59 of the other side, which defines the side (side of the electric motor 2) on which the impeller 4 of the inlet flow path 53 of the other side is located. The inlet inlet 51 described above is formed on the inner circumferential wall surface 58.

[0026] In the embodiment shown in the drawings, the guide projection section 57 on one side includes a flat surface 571 extending along the direction that intersects (perpendicular to, in the example shown) the central axis CA of the rotating shaft 3, and a recessed curved surface 572 formed on an outer circumferential side of the flat surface 571. The recessed curved surface 572 extends radially outward from an outer circumferential edge of the flat surface 571 and is formed in a recessed curved shape such that it is radially separated from the electric motor 2. An outer circumferential end of the recessed curved surface 572 is freely connected to the inner wall surface 56 of one side.

[0027] The guide projection section 57 on one side can guide the air flowing through the inlet flow path 53 on one side to the impeller 4 on that side. Specifically, a flow of air flowing radially inwards along the inner wall surface 56 of one side can be deflected along the recessed curved surface 572 and can be changed into a flow towards the other side (the side of impeller 4) in the axial direction. In this case, since the air can be introduced into the impeller 4 on one side along the axial direction through the guide projection section 57 on one side, the efficiency of the electric compressor 1 can be improved compared to introducing the air directly into the impeller 4 from the outside in the radial direction. (Sensor on one side)

[0028] Fig. Figures 4 to 6 are schematic sectional views along the axial direction in the vicinity of the impeller 4 on one side of the electric compressor 1 according to the embodiment of the present disclosure. As in Fig. As shown in Figures 1 to 6, the electric compressor 1, according to some embodiments, further comprises at least one sensor 6 on one side for acquiring information about the rotating shaft 3. The at least one sensor 6 on one side is embedded at least partially in the guide projection section 57 on one side. The sensor 6 on one side can be embedded in the guide projection section 57 on one side, or a portion thereof can be exposed to the introduction flow path 53 on one side.

[0029] In the embodiment shown in the drawings, the guide projection section 57 on one side includes a recessed section 573, which is recessed from the flat surface 571 towards one side, and the sensor 6 on one side is inserted into the recessed section 573. In the embodiment shown in the drawings, the sensor 6 on one side does not project towards the other side with respect to the flat surface 571.

[0030] A measurement target of the at least one sensor 6 described above is an end section 31 of that side with respect to the impeller 4 of that side of the rotating shaft 3. The end section 31 of that side of the rotating shaft 3 also includes another element (mother element 14 in the example shown) that is attached to the end section 31. Another element attached to the end section 31 can be a measurement target of the sensor 6 of that side. A sensor target (marker section) 15, which serves as a marker for the sensor 6 of that side to acquire information about the rotating shaft 3, can be attached to the measurement target.

[0031] According to the configuration described above, since the sensor 6 of one side is at least partially embedded in the guide projection section 57 of one side, the sensor 6 of one side and the guide projection section 57 of one side, which is a support body that carries the sensor 6 of one side, are configured such that they do not impede the flow of the gas flowing through the flow path of the electric compressor 1, such as the inlet flow path 53 of one side. The electric compressor 1, which contains the sensor 6 of one side, can suppress performance degradation of the flow path of the electric compressor 1.

[0032] Furthermore, according to the configuration described above, the sensor for acquiring information about the rotating shaft 3 is not located between the pair of bearings 11 and 12 in the axial direction of the electric compressor 1. Therefore, it is possible to suppress any increase in the motor shaft length, which is the length between the pair of bearings 11 and 12 of the electric compressor 1. In addition, according to the configuration described above, the rigidity of the guide projection section 57 on one side, which is the support body of the sensor 6 on that side, can be ensured. Therefore, the influence of disturbances caused by vibration of the electric compressor 1 on the sensor 6 on that side can be reduced, and the reliability of the sensor 6 on that side can be improved.

[0033] The electric compressor 1 according to some embodiments contains, as in Fig. As shown in Figures 1 to 3, the housing 5 on one side comprises a main body section 5A, which includes the inner circumferential wall surface 58 and the inner wall surface 59 on the other side and in which a discharge port 52 and the screw flow path 54 on one side are formed, and a flow path forming element 5B, which includes the inner wall surface 56 on one side and the guide projection section 57 on one side. The flow path forming element 5B is mechanically coupled to the main body section 5A, for example, by a fastening element such as a fastening bolt. The inlet flow path 53 on one side, as described above, is formed by combining the main body section 5A and the flow path forming element 5B. For example, the main body section 5A and the flow path forming element 5B can each be made of a metallic material, such as cast iron, steel, or iron.

[0034] According to the configuration described above, the flow path-forming element 5B can be detached from the main body section 5A of the housing 5 on one side. Therefore, it is possible to easily perform work to attach the sensor 6 on one side to the guide projection section 57 on one side, or work to detach the sensor 6 on one side from the guide projection section 57 on one side. (Arrangement of sensor on one side)

[0035] In the electric compressor 1 according to some embodiments, as in Fig. 4 and Fig. As shown in Figure 6, at least one sensor 6 (6A) of one side, as described above, is embedded at least partially in the guide projection section 57 of one side such that it is located on an extension line EL1 of the central axis CA of the rotating shaft 3. The extension line EL1 is a virtual line obtained by extending the central axis CA to one side. In the embodiment shown in the drawings, the sensor 6 (6A) of one side is attached to a bottom surface of the recessed section 573.

[0036] According to the configuration described above, the sensor 6 (6A) of one side is embedded such that it is located on the extension line EL1 of the guide projection section 57 of one side. Therefore, the sensor 6 (6A) of one side does not come into direct contact with the gas flowing through the inlet flow path 53 of one side. Therefore, the influence of the gas temperature on the sensor 6 (6A) of one side can be reduced.

[0037] The electric compressor 1 according to some embodiments contains, as in Fig. 5 and Fig. As shown in Figure 6, the guide projection section 57 of one side described above has a recessed section 573A for inserting the end section 31 of one side of the rotating shaft 3. At least one sensor 6 (6B) of one side described above is at least partially embedded in the guide projection section 57 of one side such that it is located on an outer circumferential side of the end section 31 of one side, which is inserted into the recessed section 573A for inserting the end section 31 of one side. The recessed section 573A for inserting the end section 31 is the recessed section 573 that extends from the flat surface 571 to one side. The sensor 6 (6B) of one side is attached to an inner circumferential surface of the recessed section 573A for inserting the end section 31 of one side.

[0038] As in Fig. As shown in Figure 6, at least one sensor 6 on one side can include several of the sensors 6A and 6B on one side.

[0039] In the embodiment shown in the drawings, the nut element 14 is attached to the end section 31 of the rotating shaft 3 for fastening the impeller 4 on one side. The nut element 14 comprises a nut body section 142 in which a screw section 141 is formed on an inner circumferential surface and is screwed to a screw section 311 formed on an outer circumferential surface of the end section 31 of the rotating shaft 3, and a projecting section 143 that projects from the nut body section 142 to one side. The projecting section 143 is located on the extension line EL1 described above such that it extends the end section 31 of the rotating shaft 3. The projecting section 143 has a maximum diameter that is smaller than that of the nut body section 142, and at least one portion of the projecting section 143 is inserted into the recessed section 573A for use on one side.The sensor 6B of one side is located on an outer circumferential side of the projection section 143, which is inserted into the recessed section 573A for use on one side.

[0040] According to the configuration described above, the sensor 6 (6B) of one side is embedded on an outer circumferential side of the recessed section (573A) for use in the guide projection section 57 of one side. Therefore, the sensor 6 (6B) of one side does not come into direct contact with the gas flowing through the inlet flow path 53 of one side. Therefore, the influence of the gas temperature on the sensor 6 (6B) of one side can be reduced. Furthermore, according to the configuration described above, the sensor 6 (6B) of one side is located on the outer circumferential side of the end section 31 of one side. Therefore, in comparison, if the sensor 6 (6B) of one side were located on the extension line EL1 of the end section 31 of one side, the length of the electric compressor 1 in the axial direction could be shortened. Therefore, the size of the electric compressor 1 could be reduced. (Type of sensor on one side)

[0041] In the case of the electric compressor 1 according to some embodiments, as shown in Fig. 4 and Fig. Figure 5 shows at least one sensor 6 (6A, 6B) on one side, rotation sensors 6C and 6D configured to detect information about the rotation of the rotating shaft 3. The information about the rotation of the rotating shaft 3 includes its position (rotation phase) and rotational speed in the circumferential direction. The rotation sensor 6C (6A) is located on the extension line EL1 described above, and the rotation sensor 6D (6B) is located on the outer circumferential side of the end section 31 of one side.

[0042] In the embodiment shown in the drawings, the rotation sensors 6C and 6D are Hall sensors (magnetic field sensors) containing Hall ICs. A sensor target 15 of the rotation sensors 6C and 6D contains a permanent magnet with an N pole and an S pole, which are attached to the end section 31 of one side.

[0043] At the in Fig. 4 and Fig. In the embodiment shown in Figure 5, to reduce the influence of magnetism on the rotation sensors 6C and 6D, it is preferred that the parent element 14 be made of a non-magnetic material. In the embodiment shown in Figure 5, the parent element 14 is made of a non-magnetic material. Fig. In the embodiment shown in Figure 4, the sensor target (permanent magnet) 15 is fitted into a recessed section 145, which is connected to the other side by an end surface 144 of the projecting section 143 of the mother element 14, and is attached to the mother element 14 by shrink fitting, gluing using an adhesive or the like.

[0044] At the in Fig. In the embodiment shown in Figure 5, the sensor target (permanent magnet) 15 is fitted into a recessed section 147, which extends from an end surface 146 connected to the mother body section 142 of the projecting section 143 of the mother element 14 to the other side, and is attached to the mother element 14 by shrink fitting, adhesive bonding, or the like. In this case, since the recessed section 147 is closed by the rotating shaft 3, the sensor target 15 does not fall off the recessed section 147, even if the sensor target 15 is separated from the mother element 14.

[0045] The rotary sensors (Hall sensors) 6C and 6D can be configured to detect a magnetic field from at least one of the N-pole and S-poles of the sensor target (permanent magnet) 15, or they can be configured to detect a time at which a polarity change occurs between the N-pole and the S-pole. Since the measurement target of the rotary sensors (Hall sensors) 6C and 6D is set to the end section 31 of a side, which is separate from the electric motor 2, it is possible to avoid magnetic interference with the electric motor 2. The rotary sensors 6C and 6D described above are not limited to Hall sensors. For example, the rotation sensors 6C and 6D can be resolver sensors (angle sensors) that output a rotation angle of the end section 31 of a side as a two-phase AC voltage, or optical sensors that emit light and detect reflected light returning after it has hit the measurement target.

[0046] According to the configuration described above, the electric compressor 1 can manage its reliability, service life, and performance in real time, as information about the rotational movement of the rotating shaft 3 is acquired by the rotational sensors 6C and 6D. For example, since the rotational sensors 6C and 6D can acquire information (such as rotational speed) about the rotational movement of the rotating shaft 3, it is possible to implement more precise control of the electric compressor 1's speed immediately. In particular, if the pair of bearings 11 and 12 of the electric compressor 1 are air bearings, more precise control of the electric compressor 1's speed is achieved immediately. In this way, contact wear of the air bearings can be reduced, thus extending their service life.

[0047] In the case of the electric compressor 1 according to some embodiments, as shown in Fig. Figure 6 shows at least one sensor 6 (6A, 6B) on one side, gap sensors 6E and 6F configured to detect information about the distance between the end section 31 of one side of the rotating shaft 3 and the sensor 6 of one side. The distance information includes an axial distance and a radial distance between the end section 31 of one side and the sensor 6 of one side, and vibration (amplitude) or the like of the end section 31 of one side. The gap sensor 6E (6A) is located on the extension line EL1 described above and is configured to measure an axial distance D1 between the end section 31 of one side and the sensor 6 of one side.The gap sensor 6F (6B) is located on the outer circumferential side of the end section 31 of a side and is configured to measure a radial distance D2 between the end section 31 of a side and the sensor 6 of a side. Since the radial distance D2 is measured, the vibration (amplitude) of the end section 31 of a side can be detected.

[0048] In the embodiment shown in the drawings, the gap sensor 6E measures the distance between the gap sensor 6E and the end face 144 of the projecting section 143 of the parent element 14 as the axial distance D1 described above. The gap sensor 6F is configured to measure the distance between the gap sensor 6F and an outer surface 148 of the projecting section 143 of the parent element 14 as the radial distance D2 described above. The sensor 6 on one side can comprise any one of the gap sensor 6E and the gap sensor 6F, or it can comprise both of them.

[0049] According to the configuration described above, the electric compressor 1 can manage its reliability, service life, and performance in real time because the gap sensors 6E and 6F detect information about the distance between the end section 31 of one side of the rotating shaft 3 and the sensor 6 on the other side. For example, the gap sensors 6E and 6F can detect information (such as the distance described above or the vibration of the rotating shaft 3) about the distance between the end section 31 of one side of the rotating shaft 3 and the sensor 6 on the other side. Therefore, it is possible to improve the accuracy of estimating a load generated by an environment or an operating condition of the electric compressor 1. In particular, if the pair of bearings 11 and 12 of the electric compressor 1 are air bearings, the positions of the pair of bearings 11 and 12 and the rotating shaft 3 can be determined more accurately.Therefore, the contact wear of the air bearings can be reduced. (Two-stage electric compressor)

[0050] As in Fig. As shown in Figure 2, the electric compressor 1, according to some embodiments, further comprises the impeller 7 on the other side, which is attached to the rotating shaft 3 on the other side of the rotating shaft 3 described above, the housing 8 on the other side, which accommodates the impeller 7 on the other side, and a gas inlet pipe 16. The Fig. The electric compressor shown in Figure 2 is a two-stage electric compressor in which the impeller 4 on one side is set as a low-pressure stage and the impeller 7 on the other side is set as a high-pressure stage. (Other side wheel)

[0051] The impeller 7 on the other side is mounted on the opposite side of the rotating shaft 3 with respect to the bearing 12 on the opposite side. The bearing 12 on the other side is arranged between the electric motor 2 and the impeller 7 on the other side in the axial direction of the rotating shaft 3. In the embodiment shown in the drawings, the impeller 7 on the other side is a centrifugal impeller configured to guide the air, which is directed from the other side along the axial direction, to the outside in the radial direction.

[0052] The impeller 7 of the other side is an open impeller comprising a hub 71 mechanically coupled to the rotating shaft 3 and several impeller blades 73 provided on an outer circumferential surface 72 of the hub 71. The impeller 7 of the other side can be rotated integrally with the rotating shaft 3 about the central axis CA of the rotating shaft 3. A gap (clearance) is formed between each tip (tip-side end) 74 of the several impeller blades 73 of the impeller 7 of the other side and a casing surface 80 that is curved in a projecting shape within the housing 8 of the other side.

[0053] In the embodiment shown in the drawings, the radial distance from the central axis CA of the rotating shaft 3 of the outer circumferential surface 72 of the hub 71 increases from the other side (the side separated from the electric motor 2) to the one side (the side of the electric motor 2). The hub 71 includes an inner circumferential surface 75 for forming a through-hole into which the rotating shaft 3 is inserted along the axial direction. (Other side of the casing)

[0054] As in Fig. As shown in Figure 2, the housing 8 on the other side includes an inlet 81 for introducing air (gas) from the outside to an inside of the housing 8 on the other side and a discharge port 82 for releasing the compressed air (compressed gas) from the inside to the outside of the housing 8 on the other side. Within the housing 8 on the other side, the inlet flow path 83 on the other side is formed for guiding the air, which is guided to the housing 8 on the other side via the inlet 81, to the impeller 7 on the other side, and the screw flow path 84 on the other side is formed for guiding the compressed gas, which passes the impeller 7 on the other side, to the discharge port 82.

[0055] The inlet flow path 83 on the other side is configured to guide air from the outside to the inside in a radial direction. The screw flow path 84 on the other side has a spiral shape that surrounds the outside of the impeller 7 on the other side in a radial direction. The inlet 81 and the inlet flow path 83 on the other side are each formed on one side (the side separated from the electric motor 2) with respect to the outlet 82 and the screw flow path 84 on the other side.

[0056] In the embodiment shown in the drawings, the inlet 81 and the outlet 82 of the housing 8 on the other side are each open in the direction that intersects (in the example shown, perpendicular to) the central axis CA of the rotating shaft 3. Since the inlet 81 is open in the direction that intersects the central axis CA of the rotating shaft 3, the length of the inlet flow path 83 on the other side can be shortened in the axial direction. Therefore, the electric compressor 1 can be reduced in size and weight.

[0057] In the embodiment shown in the drawings, the housing 8 on the other side is mechanically coupled to the bearing housing 13, which is located in a central section of the electric compressor 1 in the axial direction, by a fastening element, such as a fastening bolt. The impeller chamber 85 on the other side, which accommodates the impeller 7 on the other side in such a way that it is rotatable, is formed by combining the housing 8 on the other side and another element (bearing housing 13 in the example shown). The impeller chamber 85 on the other side communicates with the inlet flow path 83 on the other side, which is located on the upstream side in the direction of airflow, and with the screw flow path 84 on the other side, which is located on the downstream side in the direction of airflow. The casing surface 80 defines a section of the impeller chamber 85 on the other side.

[0058] In the housing 8 on the other side, the air led from the inlet flow path 83 on the other side to the impeller 7 on the other side is compressed by the rotation of the impeller 7 on the other side, then flows through the screw flow path 84 on the other side and is discharged from the discharge port 82.

[0059] The housing 8 on the other side comprises the inner wall surface 86 on the other side, which is axially opposite the side on which the impeller 7 of the inlet flow path 83 on the other side is located (the side separated from the electric motor 2), and the guide projection section 87 on the other side, which projects from the inner wall surface 86 on the other side towards the impeller 7 on the other side. In the embodiment shown in the drawings, the housing 8 on the other side further comprises an inner circumferential wall surface 88, which defines an outer side (outer circumferential side) of the inlet flow path 83 on the other side in the radial direction, and the inner wall surface 89 on the other side, which defines the side (side of electric motor 2) on which the impeller 7 of the inlet flow path 83 on the other side is located. The inlet inlet 81 described above is formed on the inner circumferential wall surface 88.

[0060] In the embodiment shown in the drawings, the guide projection section 87 on one side includes a flat surface 871 extending along the direction that intersects (perpendicularly in the example shown) the central axis CA of the rotating shaft 3, and a recessed curved surface 872 formed on an outer circumferential side of the flat surface 871. The recessed curved surface 872 is formed in a recessed curved shape that extends radially outward from an outer circumferential edge of the flat surface 871 and is radially separated from the electric motor 2 on the outside. An outer circumferential end of the recessed curved surface 872 is freely connected to the inner wall surface 86 on the other side.

[0061] The guide projection section 87 on the other side can guide the air flowing through the inlet flow path 83 on the other side to the impeller 7 on the other side. Specifically, the airflow flowing radially inwards along the inner wall surface 86 on the other side can be deflected along the recessed curved surface 872 and can be changed into a flow towards one side (the side of impeller 7 on the other side) in the axial direction. In this case, the air can be introduced into the impeller 7 on the other side through the guide projection section 87 on the other side along the axial direction. Therefore, in comparison to introducing the air directly into the impeller 7 on the other side from the outside in the radial direction, the efficiency of the electric compressor 1 can be improved. (Gas inlet pipe)

[0062] The gas inlet tube 16 is a tube for guiding the compressed air (compressed gas) that passes through the impeller 4 described above on one side to the inlet flow path 83 on the other side. One end of the gas inlet tube 16 is connected to the discharge port 52 of the housing 5 described above on one side, and the other end is connected to the inlet port 81 of the housing 8 described above on the other side. The compressed air, compressed by the impeller 4 on one side, is guided via the gas inlet tube and the inlet flow path 83 on one side to the impeller 7 on the other side, where it is further compressed. The temperature and pressure of the inlet flow path 83 on the other side are higher than those of the inlet flow path 53 on one side.

[0063] The compressed air, compressed by the rotation of the impeller 7 on the other side, flows through the screw flow path 84 on the other side and is discharged from the discharge port 82. In the Fig. In the embodiment shown in Figure 2, one end of the supply line 102A for compressed gas is connected to the delivery port 82, and the other end is connected to the fuel cell 101.

[0064] According to the configuration described above, the electric compressor 1 is a two-stage electric compressor, where impeller 4 on one side is a low-pressure stage impeller and impeller 7 on the other side is a high-pressure stage impeller. The temperature and pressure of the inlet flow path 53 on one side are lower than those of the inlet flow path 83 on the other side. Therefore, the thermal resistance and pressure resistance requirements for sensor 6 on one side, or sensor target 15 of sensor 6 on one side, are relatively low. Consequently, a general-purpose component can be used for sensor 6 on one side, and a dedicated cooling mechanism for sensor 6 on one side or sensor target 15 is not required. (Sensor on the other side)

[0065] Fig. Figures 7 to 9 are schematic sectional views along the axial direction in the vicinity of the impeller 7 on the other side of the electric compressor 1 according to the embodiment of the present disclosure. As in Fig. As shown in Figures 2 and 7 to 9, the electric compressor 1, according to some embodiments, further comprises at least one sensor 9 on the other side for acquiring information about the rotating shaft 3. The at least one sensor 9 on the other side is embedded at least partially in the guide projection section 87 on the other side. The sensor 9 on the other side can be embedded in the guide projection section 87 on the other side, or a portion thereof can be exposed to the introduction flow path 83 on the other side.

[0066] In the embodiment shown in the drawings, the guide projection section 87 on the other side includes a recessed section 873, which is recessed from the flat surface 871 towards the other side, and the sensor 9 on the other side is inserted into the recessed section 873. In the embodiment shown in the drawings, the sensor 9 on the other side does not project towards one side with respect to the flat surface 871.

[0067] A measurement target of at least one of the sensor 9 described above is the end section 32 on the other side of the impeller 7 on the other side of the rotating shaft 3. The end section 32 on the other side of the rotating shaft 3 also includes another element (mother element 17 in the example shown) that is attached to the end section 32. Another element attached to the end section 32 can be a measurement target of the sensor 9 on the other side. A sensor target (marker section) 18, which serves as a marker for the sensor 9 on the other side to acquire information about the rotating shaft 3, can be attached to the measurement target.

[0068] According to the configuration described above, sensor 6 on one side and sensor 9 on the other side can capture information about the rotating shaft 3 from end section 31 on one side and end section 32 on the other side of the rotating shaft 3.

[0069] According to the configuration described above, the sensor 9 on the other side is at least partially embedded in the guide projection section 87 on the other side. Therefore, the sensor 9 on the other side and the guide projection section 87 on the other side, which is the carrier body that supports the sensor 9 on the other side, are configured so that they do not impede the flow of gas flowing through the flow path of the electric compressor 1, such as the inlet flow path 83 on the other side. The electric compressor 1, which contains the sensor 9 on the other side, can suppress performance degradation in the flow path of the electric compressor 1. Furthermore, according to the configuration described above, the strength of the guide projection section 87 on the other side, which is the carrier body of the sensor 9 on the other side, can be ensured.Therefore, the influence of disturbance generated by the vibration of the electric compressor 1 on the sensor 9 on the other side can be reduced, and the reliability of the sensor 9 on the other side can be improved.

[0070] The electric compressor 1 according to some embodiments contains, as in Fig. Figure 2 shows the housing 8 on one side comprising a main body section 8A, which includes the inner circumferential wall surface 88 and the inner wall surface 89 on one side and in which the discharge port 82 and the screw flow path 84 on the other side are formed, and a flow path forming element 8B, which includes the inner wall surface 86 on the other side and the guide projection section 87 on the other side. The flow path forming element 8B is mechanically coupled to the main body section 8A, for example, by a fastening element such as a fastening bolt. The inlet flow path 83 on the other side described above is formed by combining the main body section 8A and the flow path forming element 8B. For example, the main body section 8A and the flow path forming element 8B can each be made of a metallic material, such as cast iron, steel, or iron.

[0071] According to the configuration described above, the flow path-forming element 8B can be detached from the main body section 8A of the housing 8 on the other side. Therefore, it is possible to easily perform work to attach the sensor 9 on the other side to the guide projection section 87 on the other side, or work to detach the sensor 9 on the other side from the guide projection section 87 on the other side. (Arrangement of sensor on the other side)

[0072] In the electric compressor 1 according to some embodiments, as in Fig. 7 and Fig. As shown in Figure 9, at least one sensor 9 (9A) described above is embedded at least partially in the guide projection section 87 on the other side such that it is located on the extension line EL2 of the central axis CA of the rotating shaft 3. The extension line EL2 is a virtual line obtained by extending the central axis CA to the other side. In the embodiment shown in the drawings, the sensor 9 (9A) on the other side is attached to a bottom surface of the recessed section 873.

[0073] According to the configuration described above, the sensor 9 (9A) on the other side is embedded such that it is located on the extension line EL2 of the guide projection section 87 on the other side. Therefore, the sensor 9 (9A) on the other side does not come into direct contact with the gas flowing through the introduction flow path 83 on the other side. Therefore, the influence of the gas temperature on the sensor 9 (9A) on the other side can be reduced.

[0074] The electric compressor 1 according to some embodiments contains, as in Fig. 8 and Fig. As shown in Figure 9, the guide projection section 87 described above has a recessed section 873A on the other side for inserting the end section 32 on the other side of the rotating shaft 3. The at least one sensor 9 (9B) described above is embedded at least partially in the guide projection section 87 such that it is located on an outer circumferential side of the end section 32 on the other side, which is inserted into the recessed section 873A for inserting the other side of the rotating shaft 3. The recessed section 873A for inserting the other side is the recessed section 873 that extends from the flat surface 871 to the other side. The sensor 9 (9B) on the other side is attached to an inner circumferential surface of the recessed section 873A for inserting the other side.

[0075] As in Fig. As shown in Figure 9, at least one sensor 9 on the other side can include several of the sensors 9A and 9B on the other side.

[0076] In the embodiment shown in the drawings, the nut element 17 is attached to the end section 32 of the other side of the rotating shaft 3 for fastening the impeller 7 on the other side. The nut element 17 comprises a nut body section 172 in which a screw section 171 is formed on an inner circumferential surface and is screwed to a screw section 321 formed on an outer circumferential surface of the end section 32 of the other side of the rotating shaft 3, and a projecting section 173 that projects from the nut body section 172 to the other side. The projecting section 173 is located on the extension line EL2 described above such that it extends the end section 32 of the other side of the rotating shaft 3. The projecting section 173 has a maximum diameter that is smaller than that of the nut body section 172, and at least one section of it is inserted into the recessed section 873A for use on the other side.The sensor 9B on the other side is located on an outer circumferential side of the protruding section 173, which is inserted into the recessed section 873A for use on the other side.

[0077] According to the configuration described above, the sensor 9 (9B) on the other side is embedded on an outer circumferential side of the recessed section 873A for use on the other side in the guide projection section 87 on the other side. Therefore, the sensor 9 (9B) on the other side does not come into direct contact with the gas flowing through the inlet flow path 83 on the other side. Therefore, the influence of the gas temperature on the sensor 9 (9B) on the other side can be reduced. Furthermore, according to the configuration described above, the sensor 9 (9B) on the other side is located on the outer circumferential side of the end section 32 on the other side. Therefore, in comparison, if the sensor 9 (9B) on the other side were located on the extension line EL2 of the end section 32 on the other side, the length of the electric compressor 1 in the axial direction could be shortened. Therefore, the size of the electric compressor 1 could be reduced. (Type of sensor on the other side)

[0078] In the case of the electric compressor 1 according to some embodiments, as shown in Fig. 7 and Fig. Figure 8 shows at least one sensor 9 (9A, 9B) on one side and rotation sensors 9C and 9D on the other side, configured to detect information about the rotational movement of the rotating shaft 3. The information about the rotational movement of the rotating shaft 3 includes its position (rotational phase) and rotational speed in the circumferential direction. The rotation sensor 9C (9A) is located on the extension line EL2 described above, and the rotation sensor 9D (9B) is located on the outer circumferential side of the end section 32 on the other side.

[0079] In the embodiment shown in the drawings, the rotation sensors 9C and 9D are Hall sensors (magnetic field sensors) containing Hall ICs. A sensor target 18 of the rotation sensors 9C and 9D contains a permanent magnet with the N pole and the S pole attached to the end section 32 on the other side.

[0080] At the in Fig. 7 and Fig. In the embodiment shown in Figure 8, to reduce the influence of magnetism on the rotation sensors 9C and 9D, it is preferred that the parent element 17 be made of a non-magnetic material. In the embodiment shown in Figure 8, the parent element 17 is made of a non-magnetic material. Fig. In the embodiment shown in Figure 7, the sensor target (permanent magnet) 18 is fitted into a recessed section 175, which is connected to the other side by an end surface 174 of the projecting section 173 of the mother element 17, and is attached to the mother element 17 by shrink fitting, gluing using an adhesive or the like.

[0081] At the in Fig. In the embodiment shown in Figure 8, the sensor target (permanent magnet) 18 is fitted into a recessed section 177, which extends from an end face 176, connected to the mother body section 172 of the projecting section 173 of the mother element 17, to the other side, and is attached to the mother element 17 by shrink fitting, adhesive bonding, or the like. In this case, since the recessed section 177 is closed by the rotating shaft 3, the sensor target 18 does not fall off the recessed section 177, even if the sensor target 18 is separated from the mother element 17.

[0082] The rotary sensors (Hall sensors) 9C and 9D can be configured to detect a magnetic field from at least one of the N-pole and S-poles of the sensor target (permanent magnet) 18, or they can be configured to detect a time at which the polarity between the N-pole and the S-pole changes. Since the measurement target of the rotary sensors (Hall sensors) 9C and 9D is set to the end section 32 on the other side, which is separate from the electric motor 2, it is possible to avoid magnetic interference with the electric motor 2. The rotary sensors 9C and 9D described above are not limited to Hall sensors. For example, the rotation sensors 9C and 9D can be resolver sensors (angle sensors) that output the rotation angle of the end section 32 on the other side as a two-phase AC voltage, or optical sensors that emit light and detect reflected light returning after it has hit the measurement target.

[0083] According to the configuration described above, the electric compressor 1 can manage its reliability, service life, and performance in real time, as information about the rotational movement of the rotating shaft 3 is acquired by the rotational sensors 9C and 9D. For example, since the rotational sensors 9C and 9D can acquire information (such as rotational speed) about the rotational movement of the rotating shaft 3, more precise control of the speed of the electric compressor 1 can be implemented immediately. In particular, if the pair of bearings 11 and 12 of the electric compressor 1 are air bearings, more precise control of the speed of the electric compressor 1 is implemented immediately. In this way, contact wear of the air bearings can be reduced. Therefore, the service life of the air bearings can be extended.

[0084] In the case of the electric compressor 1 according to some embodiments, as shown in Fig. Figure 9 shows at least one sensor 9 (9A, 9B) on the other side, gap sensors 9E and 9F, which are configured to detect information about the distance between the end section 32 on the other side of the rotating shaft 3 and the sensor 9 on the other side. The information about the distance between the end section 32 on the other side of the rotating shaft 3 and the sensor 9 on the other side includes the axial distance and the radial distance between the end section 32 on the other side and the sensor 9 on the other side, and the vibration (amplitude) of the end section 32 on the other side, and the like. The gap sensor 9E (9A) is located on the extension line EL2 described above and is configured to measure an axial distance D3 between the end section 32 on the other side and the sensor 9 on the other side.The gap sensor 9F (9B) is located on the outer circumferential side of the end section 32 on the other side and is configured to measure a radial distance D4 between the end section 32 on the other side and the sensor 9 on the other side. Since the radial distance D4 is measured, the vibration (amplitude) of the end section 32 on the other side can be detected.

[0085] In the embodiment shown in the drawings, the gap sensor 9E measures a distance between the gap sensor 9E and the end face 174 of the projecting section 173 of the mother element 17 as the axial distance D3 described above. The gap sensor 9F is configured to measure a distance between the gap sensor 9F and an outer surface 178 of the projecting section 173 of the mother element 17 as the radial distance D4 described above. The sensor 9 on the other side can comprise any one of the gap sensor 9E and the gap sensor 9F, or it can comprise both of them.

[0086] According to the configuration described above, the electric compressor 1 can manage its reliability, service life, and performance in real time because the gap sensors 9E and 9F detect information about the distance between the end section 32 on the other side of the rotating shaft 3 and the sensor 9 on the other side. For example, the gap sensors 9E and 9F can detect information (such as the distance or vibration of the rotating shaft 3) about the distance between the end section 32 on the other side of the rotating shaft 3 and the sensor 9 on the other side. Therefore, it is possible to improve the accuracy of estimating a load generated by an environment or an operating condition of the electric compressor 1. In particular, if the pair of bearings 11 and 12 of the electric compressor 1 are air bearings, the positions of the pair of bearings 11 and 12 and the rotating shaft 3 can be determined more accurately.Therefore, the contact wear of the air bearings can be reduced.

[0087] In a particular embodiment, the sensor 6 described above on one side includes at least one of the rotation sensors 6C and 6D, and the sensor 9 described above on the other side includes at least one of the gap sensors 9E and 9F. Furthermore, in a particular embodiment, the sensor 6 described above on one side includes at least one of the gap sensors 6E and 6F, and the sensor 9 described above on the other side includes at least one of the rotation sensors 9C and 9D.

[0088] Furthermore, in a particular embodiment, the sensor 6 described above on one side comprises the gap sensor 6F, and the sensor 9 described above on the other side comprises the gap sensor 9F. In this case, a vibration mode of the entire rotating shaft 3 can be estimated based on each vibration of the end section 31 on one side and the end section 32 on the other side of the rotating shaft 3, obtained from the gap sensor 6F and the gap sensor 9F.

[0089] In the electric compressor 1 according to some embodiments, the housing 5 described above contains on one side the resin-made flow path forming element 5B, which includes the inner wall surface 56 of one side and the guide projection section 57 of one side.

[0090] According to the configuration described above, since the flow path-forming element 5B is made of resin, the weight of the housing 5 on one side can be reduced, while ensuring the strength of the guide projection section 57 on one side, which is the support body of the sensor 6 on one side. If the impeller 4 on one side is the low-pressure stage impeller, the temperature and pressure of the gas flowing through the inlet flow path 53 on one side are relatively low. Therefore, it is preferred that the flow path-forming element 5B be made of resin.

[0091] Fig. Figure 10 is a schematic sectional view along the axial direction in the vicinity of the impeller 4 of one side of the electric compressor 1 according to the embodiment of the present disclosure. The electric compressor 1 according to some embodiments comprises at least the electric motor 2, the rotating shaft 3, the impeller 4 of one side, and the housing 5 of one side. The housing 5 of one side described above comprises the resin-made flow path forming element 5B, which includes the inner wall surface 56 of one side and the guide projection section 57 of one side. As in Fig. As shown in Figure 10, the electric compressor 1 further includes at least one sensor 6G of one side for acquiring information about the rotating shaft 3. At least one sensor 6G of one side is arranged on one side with respect to the end surface 574 of one side of the flow path forming element 5B.

[0092] At least one sensor 6G on one side can be the rotary sensors 6C and 6D described above, or the gap sensors 6E and 6F described above. In the embodiment shown in the drawings, at least one sensor 6G on one side is located on the extension line EL1 described above.

[0093] According to the configuration described above, the sensor 6G on one side is located relative to the inlet flow path 53 on that side, and the flow path forming element 5B is located on the side separated from the impeller 4 on that side. The flow path forming element 5B, made of resin, is a non-magnetic body. Therefore, if the sensor 6G on one side is a Hall sensor or similar, the detection accuracy of the sensor 6G on that side is not adversely affected. In this case, compared to the case where the sensor 6G on one side is located inside the housing 5 on that side, the sealing performance of the housing 5 on that side is easily ensured, since the sensor 6G on one side is located outside the housing 5 on that side.Furthermore, since the sensor 6G is located outside the housing 5 of one side, it is possible to easily perform work to attach the sensor 6G to the housing 5 of one side or work to detach the sensor 6G from the housing 5 of one side.

[0094] The electric compressor 1 according to some embodiments contains, as in Fig. Figure 10 shows the end surface 574 of one side of the flow path-forming element 5B having an outer recessed section 575, which is recessed towards the other side, the side on which the impeller 4 of one side is located, and at least one sensor 6G of one side is arranged in the outer recessed section 575. In the embodiment shown in the drawings, the sensor 6G of one side is attached to a bottom surface 576 of the outer recessed section 575.

[0095] According to the configuration described above, the sensor 6G on one side is located in the outer recessed section 575. This reduces the distance between the end section 31 of one side of the rotating shaft 3, which is a detection target for the sensor 6G on one side, and the sensor 6G on one side. This helps to suppress any deterioration in the detection accuracy of the sensor 6G on one side.

[0096] As in Fig. As shown in Figure 3, an electric turbocharger 110, according to some embodiments, comprises at least the electric motor 2, the rotating shaft 3, the impeller 4 of one side, the housing 5 of one side, and at least the sensor 6 of one side. The electric turbocharger 110 includes the electric compressor 1 described above. As shown in Figure 3, the electric turbocharger 110 comprises the electric compressor 1 of the electric motor 2, the impeller 4 of one side, the housing 5 of one side, and the sensor 6 of one side. Fig. As shown in Figure 3, the electric turbocharger 110 further comprises a turbine wheel 104, which is attached to the rotating shaft 3 on the other side of the rotating shaft 3 described above, and a turbine housing 105, which accommodates the turbine wheel 104. (turbine wheel)

[0097] The turbine wheel 104 is mounted on the opposite side of the rotating shaft 3 with respect to the bearing 12 on the other side. The bearing 12 on the other side is arranged between the electric motor 2 and the turbine wheel 104 in the axial direction of the rotating shaft 3. In the embodiment shown in the drawings, the turbine wheel 104 is configured to guide an exhaust gas (for example, steam) from the outside in the radial direction to the other side along the axial direction. (turbine housing)

[0098] As in Fig. As shown in Figure 3, the turbine housing 105 includes an inlet 106 for introducing the exhaust gas from the outside to the inside of the turbine housing 105 and a discharge port 107 for discharging the exhaust gas from the inside to the outside of the turbine housing 105. Inside the turbine housing 105, a spiral flow path 108 is formed for guiding the exhaust gas, which is led via the inlet 106 to the inside of the turbine housing 105, to the turbine wheel 104, and the discharge flow path 109 on the other side is formed for guiding the exhaust gas, which passes the turbine wheel 104, to the discharge port 107.

[0099] The inlet 106 is connected to one end (downstream end) of the exhaust gas inlet line 103 for guiding the exhaust gas supplied from the fuel cell 101 to the turbine housing 105. (Control device)

[0100] As in Fig.As shown in Figures 1 to 3, the electric compressor 1 according to some embodiments further comprises a control device 10 which is configured to adjust the speed of the electric motor 2 with regard to the information about the rotating shaft 3 which is detected by the at least one sensor 6 (6A to 6G) of one side as described above.

[0101] The control device 10 can be configured to adjust the speed of the electric motor 2 based on information about the rotating shaft 3, which is detected by at least one sensor 9 (9A to 9F) on another side, as described above. In the embodiment shown in the drawings, the control device 10 includes an electronic control unit for controlling an operating state of the electric motor 2. The electronic control unit can be configured as a microcomputer comprising an input device (input interface), an output device (output interface), a storage device (memory, such as a ROM or RAM and an external storage device), and a processing unit (CPU).The electronic control unit can implement an adjustment process of the speed of the electric motor 2 by causing the CPU to operate in accordance with an instruction of a program that is loaded into a main memory device (for example, data calculation or the like).

[0102] In the control device 10, various signals from sensors comprising the electric compressor 1, such as sensors 6 (6A to 6G) on one side and sensors 9 (9A to 9F) on the other, are input via an input device into the storage device or the computing device. The storage device is configured to store various signals from the sensors comprising the electric compressor 1. The computing device is configured to execute various control actions in accordance with a control program stored in the storage device. In a particular embodiment, the computing device calculates the rotational speed of the corresponding electric motor 2 based on various signals from the sensors comprising the electric compressor 1 and issues a command to the electric motor 2 to operate at the calculated speed.

[0103] According to the configuration described above, the control device 10 adjusts the speed of the electric motor 2 based on the information about the rotating shaft 3 detected by the sensor 6 on one side. In this way, the load on the electric motor 2 can be brought closer to a proper load, and the efficiency of the electric motor 2 can be improved.

[0104] In the present description, an expression of relative or absolute arrangement, such as "in a direction", "along a direction", "parallel", "perpendicular", "centered", "concentric" and "coaxial", is not to be interpreted as indicating only the arrangement in a strict literal sense, but also encompasses a state in which the arrangement is shifted relative by a tolerance or by an angle or a distance, while still making it possible to obtain the same function.

[0105] For example, expressions that indicate things are in the same state, such as "identical", "equal" and "homogeneous", do not only strictly represent an identical state, but also a state in which a difference exists with a tolerance or to such an extent that the same function can be maintained.

[0106] Furthermore, in the present description, an expression of a shape, such as a rectangular shape or a cylindrical shape, includes not only a shape, such as a rectangular shape or a cylindrical shape, in a strictly geometric sense, but also an expression of a shape including a non-uniform section or a chamfered section within the area in which the same effect can be obtained.

[0107] Furthermore, in the present description, expressions such as "provided with", "contain" and "have" a component are not exclusive expressions that exclude the presence of other components.

[0108] The present disclosure is not limited to the embodiments described above and also includes a form in which modifications are added to the embodiments described above, or a form in which the embodiments are optionally combined with each other.

[0109] For some of the embodiments described above, the content described is understood, for example, as follows.

[0110] 1) The electric compressor (1) according to at least one embodiment of the present disclosure comprises the electric motor (2), the rotating shaft (3) configured to be driven by the electric motor (2), the impeller (4) of one side attached to the rotating shaft (3) on one side of the rotating shaft (3), and the housing (5) of one side accommodating the impeller (4) of one side and containing the inlet flow path (53) of one side for guiding a gas to the impeller (4) of one side, wherein the inlet flow path (53) of one side is configured to guide the gas from the outside to the inside in the radial direction.The housing (5) of one side comprises the inner wall surface (56) of that side, which is axially opposite the side on which the impeller (4) of that side of the inlet flow path (53) of that side is located, and the guide projection section (57) of that side, which projects from the inner wall surface (56) of that side towards the impeller (4) of that side. The electric compressor (1) further comprises the at least one sensor (6) of that side for acquiring information about the rotating shaft (3), wherein the at least one sensor (6) of that side is at least partially embedded in the guide projection section (57) of that side.

[0111] According to the configuration described in 1) above, the sensor (6) of one side is at least partially embedded in the guide projection section (57) of that side. Therefore, the sensor (6) of one side and the guide projection section (57), which is the carrier body supporting the sensor (6) of one side, are configured so as not to impede the flow of gas through the flow path of the electric compressor (1), such as the inlet flow path (53) of one side. The electric compressor (1), which contains the sensor (6) of one side, can suppress performance degradation in the flow path of the electric compressor (1).

[0112] Furthermore, according to the configuration described in 1) above, the sensor for acquiring information about the rotating shaft (3) is not located between the pair of bearings (11 and 12) in the axial direction of the electric compressor (1). Therefore, it is possible to suppress any increase in the motor shaft length, which is the length between the pair of bearings (11 and 12) of the electric compressor (1). Additionally, according to the configuration described in 1) above, the rigidity of the guide projection section (57) on one side, which is the support body for the sensor (6) on that side, can be ensured. Therefore, the influence of the disturbance caused by the vibration of the electric compressor (1) on the sensor (6) on that side can be reduced, and the reliability of the sensor (6) on that side can be improved.

[0113] 2) In some embodiments of the electric compressor (1) according to 1) above, the at least one sensor (6A) of one side is embedded such that it is located on the extension line (EL1) of the central axis (CA) of the rotating shaft (3).

[0114] According to the configuration shown in 2) above, the sensor (6A) of one side is embedded such that it is located on the extension line (EL1) of the guide projection section (57) of that side. Therefore, the sensor (6A) of one side does not come into direct contact with the gas flowing through the inlet flow path (53) of that side. Therefore, the influence of the gas temperature on the sensor (6A) of that side can be reduced.

[0115] 3) In some embodiments of the electric compressor (1) according to 1) or 2), the recessed section (573A) for inserting the end section (31) of a side of the rotating shaft (3) into the guide projection section (57) of a side is formed at the top, and the at least one sensor (6B) of a side is embedded on the outer circumferential side of the end section (31) of a side inserted into the recessed section (573A) for inserting the end section (31) of a side.

[0116] According to the configuration described in 3) above, the sensor (6B) of one side is embedded on the outer circumferential side of the recessed section (573A) for use in the guide projection section (57) of one side. Therefore, the sensor (6B) of one side does not come into direct contact with the gas flowing through the inlet flow path (53) of one side. This reduces the influence of the gas temperature on the sensor (6B) of one side. Furthermore, according to the configuration described in 3) above, the sensor (6B) of one side is located on the outer circumferential side of the end section (31) of one side. Therefore, in comparison, if the sensor (6B) of one side were located on the extension line (EL1) of the end section (31) of one side, the length of the electric compressor (1) could be reduced in the axial direction. This also allows for a reduction in the size of the electric compressor (1).

[0117] 4) In some embodiments, in the electric compressor (1) according to one of 1) to 3) above, the at least one sensor (6) on one side includes the rotation sensor (6C and 6D) which is configured to detect the information about the rotational movement of the rotating shaft (3).

[0118] According to the configuration described in section 4) above, the electric compressor (1) can manage its reliability, service life, and performance in real time, as information about the rotational movement of the rotating shaft (3) is captured by the rotational sensors (6C and 6D). For example, the rotational sensors (6C and 6D) can capture information (such as rotational speed) about the rotational movement of the rotating shaft (3). Therefore, more precise control of the speed of the electric compressor (1) can be performed immediately. In particular, if the pair of bearings (11 and 12) of the electric compressor (1) are air bearings, more precise control of the speed of the electric compressor (1) is performed immediately. In this way, contact wear of the air bearings can be reduced. Therefore, the service life of the air bearings can be extended.

[0119] 5) In some embodiments of the electric compressor (1) according to one of 1) to 4) above, the at least one sensor (6) of one side comprises the gap sensor (6E and 6F) which is configured to detect the information about the distance between the end section (31) of one side of the rotating shaft (3) and the sensor (6) of one side.

[0120] According to the configuration described in section 5) above, the electric compressor (1) can manage its reliability, service life, and performance in real time because the gap sensors (6E and 6F) detect the distance between the end section (31) of one side of the rotating shaft (3) and the sensor (6) on that side. For example, the gap sensors (6E and 6F) can detect information (such as the distance or vibration of the rotating shaft 3) about the distance between the end section (31) of one side of the rotating shaft (3) and the sensor (6) on that side. Therefore, it is possible to improve the accuracy of estimating a load generated by an environment or operating condition of the electric compressor (1). In particular, if the pair of bearings (11 and 12) of the electric compressor (1) are air bearings, the positions of the pair of bearings (11 and 12) and the rotating shaft (3) can be determined more accurately.Therefore, the contact wear of the air bearings can be reduced.

[0121] 6) In some embodiments, the electric compressor (1) according to one of 1) to 5) above further comprises the impeller (7) of the other side, which is attached to the rotating shaft (3) on the other side of the rotating shaft (3), the housing (8) of the other side, which accommodates the impeller (7) of the other side and includes the inlet flow path (83) of the other side for guiding a gas to the impeller (7) of the other side, wherein the inlet flow path (83) of the other side is configured to guide the gas from the outside to the inside in the radial direction, the inner wall surface (86) of the other side, which defines the side that is axially opposite the side on which the impeller (7) of the other side of the inlet flow path (83) of the other side is located, and the guide projection section (87) of the other side, which projects from the inner wall surface (86) of the other side to the impeller (7) of the other side,and the gas inlet tube (16) for guiding the gas that passes through the impeller (4) on one side to the inlet flow path (83) on the other side.

[0122] According to the configuration in Figure 6 above, the electric compressor (1) is a two-stage electric compressor where the impeller (4) on one side is the low-pressure stage impeller and the impeller (7) on the other side is the high-pressure stage impeller. The temperature and pressure of the inlet flow path (53) on one side are lower than those of the inlet flow path (83) on the other side. Therefore, the thermal resistance and pressure resistance requirements of the sensor (6) on one side or the sensor target (15) of the sensor (6) on one side are relatively low. Therefore, a general-purpose component can be used for the sensor (6) on one side or the sensor target (15), and a dedicated cooling mechanism for the sensor (6) on one side or the sensor target (15) is not required.

[0123] 7) In some embodiments, the electric compressor (1) according to 6) above further comprises at least one sensor (9) on the other side for acquiring information about the rotating shaft (3), wherein the at least one sensor (9) on the other side is embedded at least partially in the guide projection section (87) on the other side.

[0124] According to the configuration of 7) above, the sensor (4) on one side and the sensor (9) on the other side can detect the information about the rotating shaft (3) from the end section (31) on one side and the end section (32) on the other side of the rotating shaft (3).

[0125] 8) In some embodiments, in the electric compressor (1) according to 7) above, at least one sensor (9A) on the other side is embedded such that it is located on the extension line (EL2) of the central axis (CA) of the rotating shaft (3).

[0126] According to the configuration shown in Figure 8 above, the sensor (9A) on the other side is embedded such that it is located on the extension line (EL2) of the guide projection section (87) on the other side. Therefore, the sensor (9A) on the other side is not directly exposed to the gas flowing through the inlet flow path (83) on the other side. Therefore, the influence of the gas temperature on the sensor (9A) on the other side can be reduced.

[0127] 9) In some embodiments of the electric compressor (1) according to 7) or 8), the guide projection section (87) of the other side includes the recessed section (873A) for use on the other side for inserting the end section (32) of the other side of the rotating shaft (3), and at least one sensor (9B) of the other side is embedded on the outer circumferential side of the end section (32) of the other side inserted into the recessed section (87) for use on one side of the rotating shaft (3).

[0128] According to the configuration of 9) above, the sensor (9B) of the other side is embedded on the outer circumferential side of the recessed section (873A) for use on the other side in the guide projection section (87) of the other side. Therefore, the sensor (9B) of the other side does not come into direct contact with the gas flowing through the inlet flow path (83) of the other side. Therefore, the influence of the gas temperature on the sensor (9B) of the other side can be reduced. Furthermore, according to the configuration of 9) above, the sensor (9B) of the other side is located on the outer circumferential side of the end section (32) of the other side. Therefore, in comparison, if the sensor (9B) of the other side were located on the extension line (EL2) of the end section (32) of the other side, the length of the electric compressor (1) in the axial direction could be shortened. Therefore, the size of the electric compressor (1) could be reduced.

[0129] 10) In some embodiments, the electric compressor (1) according to one of 7) to 9) above includes at least one sensor (9) on the other side the rotation sensor (9C and 9D) which is configured to detect the information about the rotational movement of the rotating shaft (3).

[0130] According to the configuration described in Figure 10 above, the electric compressor (1) can manage its reliability, service life, and performance in real time, as information about the rotational movement of the rotating shaft (3) is acquired by the rotational sensors (9C and 9D). For example, the rotational sensors (9C and 9D) can acquire information (such as the rotational speed) about the rotational movement of the rotating shaft (3). Therefore, more precise control of the speed of the electric compressor (1) can be carried out immediately. In particular, if the pair of bearings (11 and 12) of the electric compressor (1) are air bearings, more precise control of the speed of the electric compressor (1) is carried out immediately. In this way, contact wear of the air bearings can be reduced. Therefore, the service life of the air bearings can be extended.

[0131] 11) In some embodiments, the electric compressor (1) according to one of 7) to 10) above includes at least one sensor (9) on the other side the gap sensor (9E and 9F) which is configured to detect the information about the distance between the end section (32) on the other side of the rotating shaft (3) and the sensor (9) on the other side.

[0132] According to the configuration described in Figure 11 above, the electric compressor (1) can manage its reliability, service life, and performance in real time, as the gap sensors (9E and 9F) detect the distance between the end section (32) of the rotating shaft (3) on one side and the sensor (9) on the other. For example, the gap sensors (9E and 9F) can detect information (such as the distance or vibration of the rotating shaft 3) about the distance between the end section (32) on the other side of the rotating shaft (3) and the sensor (9) on the other side. Therefore, it is possible to improve the accuracy of estimating a load generated by an environment or an operating condition of the electric compressor (1).In particular, if the pair of bearings (11 and 12) of the electric compressor (1) are air bearings, the positions of the pair of bearings (11 and 12) and the rotating shaft (3) can be determined more precisely. Therefore, the contact wear of the air bearings can be reduced.

[0133] 12) In some embodiments of the electric compressor (1) according to one of 1) to 11) above, the housing (5) of one side contains the resin-made flow path forming element (5B) which includes the inner wall surface (56) of one side and the guide projection section (57) of one side.

[0134] According to the configuration shown in Figure 12 above, the flow path forming element (5B) is made of resin. In this way, the weight of the housing (5) on one side can be reduced, while ensuring the strength of the guide projection section (57) on one side, which is the support body of the sensor (6) on one side.

[0135] 13) The electric compressor (1) according to at least one embodiment of the present disclosure comprises the electric motor (2), the rotating shaft (3) configured to be driven by the electric motor (2), the impeller (4) of one side attached to the rotating shaft (3) on one side of the rotating shaft (3), and the housing (5) of one side accommodating the impeller (4) of one side and containing the inlet flow path (53) of one side for guiding a gas to the impeller (4) of one side, wherein the inlet flow path (53) of one side is configured to guide the gas from the outside to the inside in the radial direction.The housing (5) of one side includes the resin-made flow path forming element (5B), which comprises the inner wall surface (56) of one side, which is axially opposite the side on which the impeller (4) of one side of the inlet flow path (53) of one side is located, and the guide projection section (57) of one side, which projects from the inner wall surface (56) of one side towards the impeller (4) of one side. The electric compressor (1) further comprises at least one sensor (6G) of one side for acquiring information about the rotating shaft (3), wherein at least one sensor (6G) of one side is arranged on one side with respect to the end face (574) of one side of the flow path forming element (5B).

[0136] According to the configuration shown in Figure 13 above, the sensor (6G) of one side is positioned relative to the inlet flow path (53) of that side, and the flow path forming element (5B) is located on the side separated from the impeller (4) of that side. Since the resin-made flow path forming element (5B) is a non-magnetic body, the detection accuracy of the sensor (6G) of that side is not adversely affected, even if the sensor (6G) of that side is a Hall sensor or the like. In this case, compared to the case where the sensor (6G) of that side is located inside the housing (5) of that side, the sealing performance of the housing (5) of that side is easily ensured, as the sensor (6G) of that side is located outside the housing (5) of that side.Furthermore, since the sensor (6G) of one side is located outside the housing (5) of one side, it is possible to easily perform work to attach the sensor (6G) of one side to the housing (5) of one side or work to detach the sensor (6G) of one side from the housing (5) of one side.

[0137] 14) In some embodiments of the electric compressor (1) according to 13) above, the end surface (574) of one side of the flow path forming element (5B) includes the outer recessed section (575) which is recessed towards the side on which the impeller (4) of one side is located, and at least one sensor (6G) of one side is arranged in the outer recessed section (575).

[0138] According to the configuration shown in Figure 14 above, the sensor (6G) of one side is located in the outer recessed section (575). This reduces the distance between the end section (31) of one side of the rotating shaft (3), which is the detection target of the sensor (6G) of one side, and the sensor (6G) of one side. This helps to suppress any deterioration in the detection accuracy of the sensor (6G) of one side.

[0139] 15) In some embodiments, the electric compressor (1) according to one of 1) to 14) above further comprises the control device (10) which is configured to adjust the speed of the electric motor (2) with regard to the information about the rotating shaft (3) which is detected by the at least one sensor (6) on one side.

[0140] According to the configuration shown in Figure 15 above, the control device (10) adjusts the speed of the electric motor (2) based on the information about the rotating shaft (3) detected by the sensor (6) on one side. In this way, the load on the electric motor (2) can be brought closer to a suitable load, and the efficiency of the electric motor (2) can be improved. Reference symbol list 1 electric compressor 2 electric motors 3. Rotary shaft 4 Wheel of one side 5 cases on one side 5A, 8A Main body section 5B, 8B Flow path forming element 6 sensors on one side 7 Wheel on the other side 8 Housings on the other side 9 Sensor on the other side 10 Control device 11, 12 warehouses 13 bearing housings 21 Rotor 22 Stator 23 Permanent magnet 41, 71 hub 42, 72 external perimeter area 43, 73 wheel blade 44, 74 peak 45, 75 Inner circumference area 50, 80 cladding area 51, 81 Introductory admission 52, 82 Delivery connection 53 Inlet flow path of one side 54 Snail flow path of one side 55 Wheel chamber of one side 56, 89 Interior wall area of ​​one side 57 Management section of one page 58, 88 Interior perimeter wall area 59, 86 Interior wall area other side 83 Inlet flow path other side 84 Snail flow path other side 85 Wheel chamber other side CA Central axis QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 103899411

[0004]

Claims

[1] Electric compressor, comprising: an electric motor; a rotating shaft configured to be driven by the electric motor; a wheel of one side, which is attached to the rotating shaft on one side of the rotating shaft; and a housing of one side that accommodates the impeller of one side and includes an introduction flow path of one side for guiding a gas to the impeller of one side, wherein the introduction flow path of one side is configured to guide the gas from an outside to an inside in a radial direction, where the housing contains one side: an inner wall surface of a side, which is opposite in an axial direction a side on which the impeller of a side of the inlet flow path of a side is located, and a guide projection section of one side that extends from the inner wall surface of one side towards the wheel of one side, and The electric compressor further comprises at least one sensor on one side for capturing information about the rotating shaft, wherein the at least one sensor on one side is embedded at least partially in the guide projection section of one side. [2] Electric compressor according to claim 1, wherein the at least one sensor of one side is embedded such that it is located on an extension line of a central axis of the rotating shaft. [3] Electric compressor according to claim 1 or 2, wherein a recessed section is formed for inserting a side for inserting an end section of a side of the rotating shaft into the guide projection section of a side, and which is embedded in at least one sensor of one side in an outer circumferential side of the end section of one side, which is inserted into the recessed section for use of one side of the rotating shaft. [4] Electric compressor according to any one of claims 1 to 3, wherein the at least one sensor on one side includes a rotation sensor configured to detect information about a rotational movement of the rotating shaft. [5] Electric compressor according to any one of claims 1 to 4, wherein the at least one sensor of one side comprises a gap sensor configured to detect information about a distance between an end section of one side of the rotating shaft and the sensor of one side. [6] Electric compressor according to any one of claims 1 to 5, further comprising: a wheel on the other side, which is attached to the rotating shaft on the other side of the rotating shaft; the housing on the other side, which accommodates the impeller on the other side and includes the introduction flow path on the other side for guiding a gas to the impeller on the other side, wherein the introduction flow path on the other side is configured to guide the gas from the outside to the inside in the radial direction, wherein the housing on the other side defines the inner wall surface on the other side, which is axially opposite a side on which the impeller on the other side of the introduction flow path on the other side is located, and includes the guide projection section on the other side, which projects from the inner wall surface on the other side towards the impeller on the other side; and a gas inlet tube for guiding the gas that passes through the impeller on one side to the inlet flow path on the other side. [7] Electric compressor according to claim 6, further comprising: at least one sensor on the other side for capturing information about the rotating shaft, wherein the at least one sensor on the other side is at least partially embedded in the guide projection section on the other side. [8] Electric compressor according to claim 7, wherein at least one sensor on the other side is embedded such that it is located on an extension line of a central axis of the rotating shaft. [9] Electric compressor according to claim 7 or 8, wherein a recessed section is formed for insertion of an end section on the other side of the rotating shaft into the guide projection section on the other side, and at least one sensor on the other side is embedded in an outer circumferential side of the end section of the other side, which is inserted into the recessed section for use on the other side of the rotating shaft. [10] Electric compressor according to one of claims 7 to 9, wherein at least one sensor on the other side includes a rotary sensor configured to detect information about a rotary movement of the rotating shaft. [11] Electric compressor according to any one of claims 7 to 10, wherein at least one sensor on the other side includes a gap sensor configured to detect information about a distance between an end section on the other side of the rotating shaft and the sensor on the other side. [12] Electric compressor according to any one of claims 1 to 11, wherein the housing of one side includes a flow path forming element made of resin, which includes the inner wall surface of one side and the guide projection section of one side. [13] Electric compressor, comprising: an electric motor; a rotating shaft configured to be driven by the electric motor; a wheel of one side, which is attached to the rotating shaft on one side of the rotating shaft; and a housing of one side that accommodates the impeller of one side and includes an introduction flow path of one side for guiding a gas to the impeller of one side, wherein the introduction flow path of one side is configured to guide the gas from an outside to an inside in a radial direction, wherein the housing on one side contains a flow path forming element made of resin, which includes: an inner wall surface of a side, which is opposite in an axial direction a side on which the impeller of a side of the inlet flow path of a side is located, and a guide projection section of one side that extends from the inner wall surface of one side towards the wheel of one side, and The electric compressor further comprises at least one sensor on one side for capturing information about the rotating shaft, wherein the at least one sensor on one side is arranged on one side in relation to an end face of one side of the flow path forming element. [14] Electric compressor according to claim 13, wherein the end surface of one side of the flow path forming element includes an outer recessed section which is recessed to one side on which the impeller of one side is located, and where at least one sensor on one side is located in the outer recessed section. [15] Electric compressor according to any one of claims 1 to 14, further comprising: a control device configured to adjust the speed of the electric motor in relation to information about the rotating shaft detected by at least one sensor on one side.

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