Rotating electric machine

Abstract

To enable easy manufacturing while suppressing the transmission of bearing vibrations to the resolver. [Solution] The rotating electric machine includes a bearing that supports a shaft and has a cylindrical inner ring and a cylindrical outer ring, a resolver attached to the shaft, and a spacer attached to the shaft, sandwiched between the bearing and the resolver, and having a flat contact surface that contacts the outer ring in the direction of the shaft's axis of rotation.

Description

Technical Field

[0001] The present invention relates to a rotating electric machine.

Background Art

[0002] Rotating electric machines such as motors and generators are used in various fields. As a document related to rotating electric machines, for example, Patent Document 1 can be cited. Patent Document 1 discloses a rotating electric machine provided with a resolver and a bearing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the rotating electric machine disclosed in Patent Document 1, the resolver and the bearing are integrated. Therefore, in this rotating electric machine, the vibration of the bearing is likely to be transmitted to the resolver, making it difficult for the resolver to obtain an alternating current of an accurate value, or the alternating current may include noise. Further, since this rotating electric machine requires a bearing provided with a raceway ring having a complex shape, it may increase the processes, costs, time, etc. required for manufacturing.

[0005] Therefore, an object of the present invention is to provide a rotating electric machine that can be easily manufactured while suppressing the transmission of the vibration of the bearing to the resolver.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the rotating electric machine of the present invention comprises a bearing that supports a shaft and has a cylindrical inner ring and a cylindrical outer ring, a resolver attached to the shaft, and a spacer attached to the shaft, sandwiched between the bearing and the resolver, and having a flat contact surface that contacts the outer ring in the direction of the rotation axis of the shaft.

[0007] In the rotating electric machine of the present invention, the spacer is separated from the resolver and further has a non-contact surface that overlaps with the bearing in at least a portion in the direction of the rotation axis.

[0008] In the rotating electric machine of the present invention, the non-contact surface is distributed in a direction perpendicular to the rotation axis to a position further from the rotation axis than the bearing.

[0009] In the rotating electric machine of the present invention, the spacer comprises a first member having a first internal non-contact surface that is positioned opposite the contact surface in the direction of the rotation axis and overlaps with the bearing in at least a portion of the direction of the rotation axis, and a second member having a second internal non-contact surface that is separated from the first internal non-contact surface and overlaps with the bearing and the first internal non-contact surface in at least a portion of the direction of the rotation axis.

[0010] In the rotating electric machine of the present invention, the region sandwiched between the first internal non-contact surface and the second internal non-contact surface is distributed in a direction perpendicular to the rotation axis to a position further from the rotation axis than the bearing.

[0011] The rotating electric machine of the present invention further comprises a magnetic shielding member, which is disposed between the rotor or stator and the resolver and is made of a non-magnetic material. [Effects of the Invention]

[0012] According to the present invention, it is possible to easily manufacture bearings while suppressing the transmission of bearing vibrations to the resolver. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows examples of shafts, bearings, resolvers, spacers, etc., according to the first embodiment. [Figure 2] This figure shows an example of a spacer according to the first embodiment. [Figure 3] This figure shows examples of shafts, bearings, resolvers, spacers, etc., according to the second embodiment. [Figure 4] This figure shows examples of shafts, bearings, resolvers, spacers, etc., according to the third embodiment. [Figure 5] This figure shows examples of shafts, bearings, resolvers, spacers, magnetic shielding members, etc., according to the fourth embodiment. [Modes for carrying out the invention]

[0014] (First Embodiment) A first embodiment of the present invention will be described using the case where the rotating electric machine is a motor as an example. Figure 1 shows an example of a shaft, bearing, resolver, spacer, etc. according to the first embodiment. As shown in Figure 1, the motor 1X comprises a bearing housing 10, a shaft 20, a rotor 30, a stator 40, a bearing 50, a resolver 60, a spacer 70X, a bolt 80, and a washer 90.

[0015] The bearing housing 10 is a component that covers the largest opening at one end of a cylindrical housing that houses the shaft 20, rotor 30, stator 40, bearing 50, resolver 60, and spacer 70X. The shaft 20 is a rod-shaped component that rotates around the rotation axis A. The rotor 30 is attached to the shaft 20 and comprises a rotor core and multiple magnets. The rotor 30 receives the magnetic force generated by the stator 40 and rotates together with the shaft 20 around the rotation axis A. The stator 40 comprises a stator core 41 and a coil 42. The stator 40 generates a magnetic force when the coil 42 is energized.

[0016] The bearing 50 supports the shaft 20 in a manner that enables rotation about the rotation axis A. The bearing 50 includes an outer ring 51, an inner ring 52, and a plurality of rolling elements 53.

[0017] The outer ring 51 is a cylindrical member that is fitted into a cylindrical groove formed in the bearing housing 10. The outer ring 51 is sandwiched between a portion of the bearing housing 10 where the position in the direction perpendicular to the rotation axis A overlaps with the outer ring 51 and the spacer 70X, thereby applying a preload. For this reason, even when the motor 1X is operating, the outer ring 51 does not rotate steadily about the rotation axis A together with the shaft 20 and the rotor 30.

[0018] The inner ring 52 is a cylindrical member into which the shaft 20 is fitted. The inner ring 52 has the same dimension as the outer ring 51 in the direction of the rotation axis A. The inner ring 52 rotates steadily about the rotation axis A together with the shaft 20 and the rotor 30 when the motor 1X is operating.

[0019] All of the rolling elements 53 are, for example, spherical members and are inserted between the outer ring 51 and the inner ring 52. When the motor 1X is operating, all of the rolling elements 53 rotate with respect to the outer ring 51 and the inner ring 52 and receive the rotation around the rotation axis A of the shaft 20 and the rotor 30.

[0020] Also, the bearing 50 slightly protrudes in the direction where the spacer 70Y is located from the cylindrical groove formed in the bearing housing 10. For example, the bearing 50 protrudes 0.1 mm in the direction where the spacer 70Y is located from the cylindrical groove formed in the bearing housing 10.

[0021] The resolver 60 is attached to the shaft 20 and detects the angle by which the shaft 20 and the rotor 30 rotate around the rotation axis A.

[0022] Figure 2 shows an example of a spacer according to the first embodiment. The spacer 70X is an annular member attached to the shaft 20 and sandwiched between the bearing 50 and the resolver 60. As shown in Figures 1 and 2, the spacer 70X has surfaces 701X, 702X, 703X and 704X.

[0023] As shown in Figure 1, surface 701X is a flat surface of the spacer 70X facing the direction in which the bearing 50 is located. Surface 701X is an example of a contact surface and is in contact with the outer ring 51 in the direction of the rotation axis A of the shaft 20. Also, as described above, since the bearing 50 protrudes slightly from the cylindrical groove formed in the bearing housing 10 in the direction in which the spacer 70X is located, surface 701X applies preload to the outer ring 51. Therefore, the spacer 70X holds the outer ring 51 of the bearing 50.

[0024] Surface 702X is a flat surface of the spacer 70X facing the direction in which the resolver 60 is located, as shown in Figures 1 and 2. Surface 703X is a cylindrical surface of the spacer 70X with the rotation axis A as its central axis and a relatively small dimension in the direction of the rotation axis A, as shown in Figures 1 and 2. Surface 704X is a flat surface of the spacer 70X facing the direction in which the resolver 60 is located, as shown in Figures 1 and 2. Surfaces 702X, 703X, and 704X are examples of contact surfaces, following the outer shape of the resolver 60 in the direction of the rotation axis A and in contact with the resolver 60 in the direction of the rotation axis A.

[0025] The bolt 80 and washer 90 fasten together with the resolver 60 and spacer 70X to the bearing housing 10.

[0026] The motor 1X according to the first embodiment has been described above. The motor 1X includes a spacer 70X. The spacer 70X is attached to the shaft 20 and is sandwiched between the bearing 50 and the resolver 60. The spacer 70X also has a surface 701X, which is an example of a contact surface. Surface 701X is a flat surface that is in contact with the outer ring 51 in the direction of the rotation axis A.

[0027] Motor 1X is equipped with a spacer 70X having a surface 701X which is an example of a contact surface, making it possible to use a general bearing 50 in which the dimensions of the outer ring 51 in the direction of the rotation axis A are equal to the dimensions of the inner ring 52 in the direction of the rotation axis A. Therefore, motor 1X can reduce the processes, costs, and time required for manufacturing. In other words, motor 1X can be manufactured easily. Furthermore, because motor 1X is equipped with a spacer 70X sandwiched between the bearing 50 and the resolver 60, it is possible to suppress the transmission of vibrations of the bearing 50 to the resolver 60.

[0028] Furthermore, the motor 1X is equipped with a spacer 70X that follows the outer shape of the resolver 60 in the direction of the rotation axis A and is in contact with the resolver 60 in the direction of the rotation axis A. This allows the motor 1X to effectively utilize the space near the resolver 60 in the direction of the rotation axis A and reduce its dimensions in the direction of the rotation axis A.

[0029] (Second embodiment) Next, the motor according to the second embodiment will be described with reference to Figure 3. In the description of the second embodiment, the differences from the embodiment described above will be mainly described, the same reference numerals will be used for the same components as in the embodiment described above, and explanations of the same content as in the embodiment described above will be omitted as appropriate.

[0030] Figure 3 shows an example of a shaft, bearing, resolver, spacer, etc., according to the second embodiment. As shown in Figure 3, the motor 1Y comprises a bearing housing 10, a shaft 20, a bearing 50, a resolver 60, a spacer 70Y, a bolt 80, and a washer 90. The motor 1Y also comprises a rotor 30 and a stator 40, similar to the motor 1X according to the first embodiment. Furthermore, the bearing 50 protrudes slightly from a cylindrical groove formed in the bearing housing 10 in the direction in which the spacer 70Y is located, similar to the motor 1X according to the first embodiment.

[0031] The spacer 70Y is an annular member attached to the shaft 20 and sandwiched between the bearing 50 and the resolver 60. As shown in Figures 1 and 2, the spacer 70Y has faces 701Y, 702Y, 703Y, 704Y, 705Y and 706Y.

[0032] Surface 701Y, as shown in Figure 3, is a flat surface of the spacer 70Y facing the direction in which the bearing 50 is located. Surface 701Y is an example of a contact surface and is in contact with the outer ring 51 in the direction of the rotation axis A of the shaft 20. Also, as described above, since the bearing 50 protrudes slightly from the cylindrical groove formed in the bearing housing 10 in the direction in which the spacer 70Y is located, surface 701Y applies preload to the outer ring 51. Therefore, the spacer 70Y holds the outer ring 51 of the bearing 50.

[0033] As shown in Figure 3, surface 702Y is a flat surface of the spacer 70Y facing the direction in which the resolver 60 is located. Also, surface 702Y does not overlap with the bearing 50 in the direction of the rotation axis A, i.e., the left-right direction in Figure 3. As shown in Figure 3, surface 703Y is a cylindrical surface of the spacer 70Y with the rotation axis A as its central axis and a relatively small dimension in the direction of the rotation axis A. As shown in Figure 3, surface 704Y is a flat surface of the spacer 70Y facing the direction in which the resolver 60 is located. Surfaces 702Y, 703Y, and 704Y are examples of contact surfaces, following the outer shape of the resolver 60 in the direction of the rotation axis A and in contact with the resolver 60 in the direction of the rotation axis A.

[0034] As shown in Figure 3, surface 705Y is a flat surface of the spacer 70Y facing the direction in which the resolver 60 is located. Surface 705Y is away from the resolver 60, and a portion of it overlaps with the bearing 50 in the direction of the rotation axis A. As shown in Figure 3, surface 706Y is a cylindrical surface of the spacer 70Y with the rotation axis A as its central axis, and its dimensions in the direction of the rotation axis A are relatively small. Surface 706Y is away from the resolver 60, and not all of it overlaps with the bearing 50 in the direction of the rotation axis A. Surfaces 705Y and 706Y are examples of non-contact surfaces. The area enclosed by surfaces 705Y, 706Y, and the resolver 60 is a clearance.

[0035] As described above, the bearing 50 protrudes slightly from the cylindrical groove formed in the bearing housing 10 in the direction in which the spacer 70Y is located. Also, as described above, surface 701Y applies preload to the outer ring 51. Therefore, the portion of the spacer 70Y sandwiched between surfaces 701Y and 705Y is deflected in the direction in which the resolver 60 is located.

[0036] Furthermore, the non-contact surfaces are distributed to positions further from the rotation axis A than the bearing 50 in a direction perpendicular to the rotation axis A. For example, as shown in Figure 3, the entire surface 706Y and the portion of surface 705Y near the boundary with surface 706 are distributed to positions further from the rotation axis A than the region D where the bearing 50 is located in a direction perpendicular to the rotation axis A.

[0037] The motor 1Y according to the second embodiment has been described above. The motor 1Y is separated from the resolver 60 and has a non-contact surface that overlaps with the bearing 50 in at least a portion in the direction of the rotation axis A. As a result, even if the portion of the motor 1Y sandwiched between surfaces 701Y and 705Y is deflected in the direction in which the resolver 60 is located, the spacer 70Y can avoid applying stress to the resolver 60, thereby reducing the accuracy of detection by the resolver 60.

[0038] Furthermore, surfaces 705Y and 706Y are examples of non-contact surfaces and are distributed to a position further from the rotation axis A than the bearing 50 in a direction perpendicular to the rotation axis A. This makes it possible to make the portion of motor 1Y sandwiched between surfaces 701Y and 705Y more flexible in the direction in which the resolver 60 is located. Therefore, motor 1Y can more reliably avoid the spacer 70Y applying stress to the resolver 60 and reducing the accuracy of detection by the resolver 60.

[0039] Furthermore, the motor 1Y is equipped with a spacer 70Y that follows the outer shape of the resolver 60 in the direction of the rotation axis A and is in contact with the resolver 60 in the direction of the rotation axis A. This allows the motor 1Y to effectively utilize the space near the resolver 60 in the direction of the rotation axis A and reduce its dimensions in the direction of the rotation axis A.

[0040] (Third embodiment) Next, the motor according to the third embodiment will be described with reference to Figure 4. In describing the third embodiment, the differences from the embodiments described above will be mainly explained, the same reference numerals will be used for the same components as in the embodiments described above, and explanations of the same aspects as in the embodiments described above will be omitted as appropriate.

[0041] Figure 4 shows examples of the shaft, bearing, resolver, spacer, etc. according to the third embodiment. As shown in Figure 4, the motor 1Z comprises a bearing housing 10, a shaft 20, a bearing 50, a resolver 60, a spacer 70Z, a bolt 80, and a washer 90. The motor 1Z also comprises a rotor 30 and a stator 40, similar to the motor 1X according to the first embodiment.

[0042] As shown in Figure 4, the spacer 70Z comprises a first member 71Z and a second member 72Z. Both the first member 71Z and the second member 72Z are annular members attached to the shaft 20, and the spacer 70Z is formed by bonding them together.

[0043] As shown in Figure 4, the first member 71Z comprises a surface 711Z and a surface 712Z. Surface 711Z is a flat surface of the first member 71Z facing the direction in which the bearing 50 is located. Surface 711Z is an example of a contact surface and is in contact with the outer ring 51 in the direction of the rotation axis A of the shaft 20. Surface 711Z may also apply preload to the outer ring 51.

[0044] Surface 712Z is ​​positioned opposite surface 711Z in the direction of rotation axis A and is a flat surface facing the direction in which resolver 60 is located. Surface 712Z overlaps with bearing 50 in at least part in the direction of rotation axis A. Surface 712Z is ​​an example of a first internal non-contact surface and is separated from surface 725Z, which is an example of a second internal non-contact surface described later.

[0045] As shown in Figure 4, the second member 72Z includes surfaces 722Z, 723Z, 724Z, 725Z, and 726Z.

[0046] Surface 722Z is ​​a flat surface of the second member 72Z facing the direction in which the resolver 60 is located. Surface 723Z is a cylindrical surface of the second member 72Z with the rotation axis A as its central axis and a relatively small dimension in the direction of the rotation axis A. Surface 724Z is a flat surface of the second member 72Z facing the direction in which the resolver 60 is located. Surfaces 722Z, 723Z, and 724Z are examples of contact surfaces, following the outer shape of the resolver 60 in the direction of the rotation axis A and in contact with the resolver 60 in the direction of the rotation axis A. Furthermore, the sum of the areas of surface 722Z, surface 723Z, and surface 724Z is greater than the sum of the areas of surface 702Y, surface 703Y, and surface 704Y according to the second embodiment. In other words, the contact surface according to the third embodiment has a larger area than the contact surface according to the second embodiment.

[0047] Surface 725Z is a flat surface of the second member 72Z facing the direction in which the bearing 50 is located. Surface 725Z overlaps with the bearing 50 and surface 712Z, which is an example of the first internal non-contact surface, in the direction of the rotation axis A, at least in part. Surface 726Z is a cylindrical surface of the second member 72Z with the rotation axis A as its central axis and having a relatively small dimension in the direction of the rotation axis A. Surfaces 725Z and 726Z are examples of the second internal non-contact surface and are separated from surface 712Z, which is an example of the first internal non-contact surface.

[0048] Furthermore, the second internal non-contact surface is offset in the direction of the resolver 60 from the surface where the first member 71Z and the second member 72Z are bonded together in the direction of the rotation axis A. Specifically, surface 725Z, which is part of the second internal non-contact surface, is offset in the direction of the resolver 60 from the surface where the first member 71Z and the second member 72Z are bonded together in the direction of the rotation axis A. As a result, the region sandwiched between the first internal non-contact surface and the second internal non-contact surface is a relief area.

[0049] Furthermore, the portion of the first member 71Z sandwiched between surfaces 711Z and 712Z will bend in the direction of the resolver 60 when preload is applied to the bearing 50 by surface 711Z.

[0050] Furthermore, the region sandwiched between the first internal non-contact surface and the second internal non-contact surface is a relief area and is distributed to a position further from the rotation axis A than the bearing 50 in a direction perpendicular to the rotation axis A. For example, as shown in Figure 4, the region surrounded by surface 726Z, the part of surface 712Z near the boundary with surface 726Z, and the part of surface 725Z near the boundary with surface 726Z is distributed to a position further from the rotation axis A than the bearing 50 in a direction perpendicular to the rotation axis A.

[0051] The motor 1Z according to the third embodiment has been described above. The motor 1Z includes a spacer 70Z that contacts the resolver 60 with a larger contact surface area than the motor 1Y according to the second embodiment. As a result, the motor 1Z can support the resolver 60 more reliably than the motor 1Y according to the second embodiment.

[0052] Motor 1Z comprises a first member 71Z and a second member 72Z. The first member 71Z has a surface 712Z positioned opposite to surface 711Z, which is an example of a contact surface, in the direction of the rotation axis A. Surface 712Z is ​​an example of a first internal non-contact surface, and at least a portion of it overlaps with the bearing 50 in the direction of the rotation axis A. The second member 72Z has surfaces 725Z and 726Z that are separated from the first internal non-contact surface. Surfaces 725Z and 726 are examples of second internal non-contact surfaces, and at least a portion of them overlap with the bearing 50 and the first internal non-contact surface in the direction of the rotation axis A. As a result, even if the portion of motor 1Z sandwiched between surfaces 711Z and 712Z is ​​deflected in the direction in which the resolver 60 is located, the spacer 70Z can avoid applying stress to the resolver 60, thereby reducing the accuracy of detection by the resolver 60.

[0053] Furthermore, the region sandwiched between the first internal non-contact surface and the second internal non-contact surface is distributed to a position further from the rotation axis A than the bearing 50 in a direction perpendicular to the rotation axis A. This allows the motor 1Z to bend more easily in the direction in which the resolver 60 is located, in the portion sandwiched between surfaces 711Z and 712Z. Therefore, the motor 1Z can more reliably avoid the spacer 70Z applying stress to the resolver 60 and reducing the accuracy of detection by the resolver 60.

[0054] Furthermore, the motor 1Z is equipped with a spacer 70Z that follows the outer shape of the resolver 60 in the direction of the rotation axis A and is in contact with the resolver 60 in the direction of the rotation axis A. This allows the motor 1Z to effectively utilize the space near the resolver 60 in the direction of the rotation axis A and reduce its dimensions in the direction of the rotation axis A.

[0055] In the third embodiment, the example given was that the second internal non-contact surface is offset in the direction of the resolver 60 from the surface on which the first member 71Z and the second member 72Z are bonded in the direction of the rotation axis A, but the embodiment is not limited to this. In the third embodiment, the first internal non-contact surface may also be offset in the direction of the bearing 50 from the surface on which the first member 71Z and the second member 72Z are bonded in the direction of the rotation axis A. Even in such a case, the region sandwiched between the first internal non-contact surface and the second internal non-contact surface provides clearance.

[0056] Furthermore, in the third embodiment, the example given was that surfaces 711Z and 712Z are surfaces on the first member 71Z, and surfaces 722Z, 723Z, 724Z, 725Z, and 726 are surfaces on the second member 72Z, but the embodiment is not limited to this. These surfaces may all be surfaces of at least one of the first member 71Z and the second member 72Z. Therefore, the shapes of the first member and the second member according to the third embodiment are not particularly limited, as long as the outer shape of the spacer formed by combining the first member and the second member is equivalent to the outer shape of the spacer 70Z.

[0057] Furthermore, although the third embodiment was described using the example where the spacer 70Z is composed of a first member 71Z and a second member 72Z, the embodiment is not limited thereto. The spacer according to the third embodiment may be a single member having a contact surface and a relief sandwiched between a first internal non-contact surface and a second internal non-contact surface.

[0058] (Fourth embodiment) Next, the motor according to the fourth embodiment will be described with reference to Figure 5. In the description of the fourth embodiment, the differences from the embodiments described above will be mainly described, the same reference numerals will be used for the same components as in the embodiments described above, and explanations of the same content as in the embodiments described above will be omitted as appropriate.

[0059] Figure 5 shows examples of the shaft, bearing, resolver, spacer, magnetic shielding member, etc., according to the fourth embodiment. As shown in Figure 5, motor 1W comprises a bearing housing 10, a shaft 20, a rotor 30, a stator 40, a bearing 50, a resolver 60, a spacer 70X, and a bolt 80. Furthermore, unlike motors 1X, 1Y, and 1Z described above, motor 1W is equipped with a magnetic shielding member 95 instead of a washer 90.

[0060] As shown in Figure 5, the magnetic shielding member 95 is positioned between the rotor 30 or stator 40 and the resolver 60, and is made of a non-magnetic material. The magnetic shielding member 95 is fastened together with the resolver 60 and spacer 70X to the bearing housing 10 by bolts 80. The magnetic shielding member 95 follows the outer shape of the resolver 60 in the direction of the rotation axis A and is in contact with the resolver 60 in the direction of the rotation axis A.

[0061] The motor 1W according to the fourth embodiment has been described above. The motor 1W is equipped with a magnetic shielding member 95 made of a non-magnetic material, which is positioned between the rotor 30 or stator 40 and the resolver 60. As a result, even if the resolver 60 is positioned closer to the rotor 30 and stator 40 than the bearing 50 and spacer 70X, the motor 1W can reduce the electromagnetic influence that the rotor 30 and stator 40 have on the resolver. Therefore, the motor 1W can avoid a decrease in the detection accuracy of the resolver 60.

[0062] In the embodiments described above, the example of a rotating electric machine being a motor was used, but the invention is not limited to this. The rotating electric machine in the embodiment may be a generator instead of a motor, for example.

[0063] Preferred embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. That is, the present invention includes embodiments that have been modified, substituted, or redesigned in accordance with the spirit of the present invention, and these embodiments are not excluded. [Explanation of Symbols]

[0064] 1X, 1Y, 1Z, 1W…Motor, 10…Bearing housing, 20…Shaft, 30…Rotor, 40…Stator, 50…Bearing, 60…Resolver, 70X, 70Y, 70Z…Spacer, 80…Bolt, 90…Washer, A…Rotating shaft

Claims

1. A bearing that supports the shaft and has a cylindrical inner ring and a cylindrical outer ring, A resolver attached to the aforementioned shaft, A spacer is attached to the shaft, sandwiched between the bearing and the resolver, and having a flat contact surface that contacts the outer ring in the direction of the shaft's axis of rotation, A rotating electric machine equipped with the following features.

2. The spacer is separated from the resolver and further has a non-contact surface that overlaps with the bearing in at least a portion in the direction of the rotation axis. The rotating electric machine according to claim 1.

3. The non-contact surface is distributed in a direction perpendicular to the rotation axis to a position further from the rotation axis than the bearing. The rotating electric machine according to claim 2.

4. The spacer comprises a first member having a first internal non-contact surface positioned opposite the contact surface in the direction of the rotation axis, with at least a portion overlapping with the bearing in the direction of the rotation axis, and a second member having a second internal non-contact surface that is separated from the first internal non-contact surface, with at least a portion overlapping with the bearing and the first internal non-contact surface in the direction of the rotation axis. The rotating electric machine according to claim 1.

5. The region sandwiched between the first internal non-contact surface and the second internal non-contact surface is distributed in a direction perpendicular to the rotation axis to a position further from the rotation axis than the bearing. The rotating electric machine according to claim 4.

6. The system further comprises a magnetic shielding member, which is positioned between the rotor or stator and the resolver and is made of a non-magnetic material. A rotating electric machine according to any one of claims 1 to 5.

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