Motor resolver device

Abstract

To obtain a motor resolver device which inhibits complication of a structure of the motor resolver device and prevents scattering of a lubrication oil from a motor rotor to the outside of a motor housing.SOLUTION: A motor resolver device includes: a motor housing 2 including a motor stator 3 and a motor rotor 4 provided therein; a resolver rotor 6 which is provided inside the motor housing 2 and rotates with the motor rotor 4; and a resolver stator 5 which is provided outside the motor housing 2 and faces the resolver rotor 6. The motor stator 3, the motor rotor 4, and the resolver rotor 6 are covered by the motor housing 2. The motor housing 2 has a partition part 24 provided between the resolver rotor 6 and the resolver stator 5. The partition part 24 is formed of a non-magnetic material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor resolver device. [Background technology]

[0002] Conventionally, a motor resolver device has been known that includes a motor housing, a motor stator, a motor rotor, a resolver stator, and a resolver rotor. The motor stator and the motor rotor are provided inside the motor housing. The resolver stator and the resolver rotor are provided outside the motor housing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-150108 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration of the motor resolver device described in Patent Document 1, the resolver rotor is not covered by the motor housing. As a result, when lubricating oil is applied to the motor rotor, the lubricating oil flows from the motor rotor to the resolver rotor and splashes from the resolver rotor to the outside of the motor housing. If the lubricating oil splashes to the outside of the motor housing, there is a risk that the lubricating oil will adhere to the lead wires electrically connected to the resolver stator. If the lubricating oil adheres to the lead wires, there is a risk that the lubricating oil will adhere to peripheral devices of the motor resolver device via the lead wires.

[0005] In order to prevent the lubricating oil applied to the motor rotor from scattering outside the motor housing, it is possible to configure the resolver stator and resolver rotor so that they are covered by the motor housing. In this case, a connector to which lead wires are connected must be connected to the resolver stator, and an O-ring must be provided in the gap between the connector and the motor housing. However, a motor resolver device configured in this way has the problem of being complicated in configuration.

[0006] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a motor resolver device that can prevent the configuration of the motor resolver device from becoming complicated and can prevent lubricating oil from splashing from the motor rotor to the outside of the motor housing. [Means for solving the problem]

[0007] The motor resolver device of the present invention comprises a motor housing having a motor stator and a motor rotor provided inside, a resolver rotor provided inside the motor housing and rotating together with the motor rotor, and a resolver stator provided outside the motor housing and facing the resolver rotor, the motor stator, motor rotor and resolver rotor being covered by the motor housing, and the motor housing having a partition provided between the resolver rotor and the resolver stator, the partition being made of a non-magnetic material. In the motor resolver device of this invention, the motor housing has a cylindrical portion in which the motor stator and motor rotor are arranged inside, and an annular disc portion that is provided at the end of the cylindrical portion in the axial direction and protrudes inward from the cylindrical portion in the radial direction, and the partition portion is formed cylindrically and is arranged so as to extend radially from the inside of the disc portion in the axial direction away from the motor stator. In the motor resolver device of this invention, the motor housing has a cylindrical portion in which the motor stator and motor rotor are arranged inside, and an annular disc portion that is provided at the end of the cylindrical portion in the axial direction and protrudes outward from the cylindrical portion in the radial direction, and the partition portion is formed cylindrically and is arranged so as to extend radially from the outside of the disc portion in the axial direction away from the motor stator. In the motor resolver device according to the present invention, the resolver stator is provided on the disk portion. In the motor resolver device according to the present invention, the motor housing is made of aluminum. [Effects of the Invention]

[0008] According to the motor resolver device of the present invention, the configuration of the motor resolver device can be prevented from becoming complicated, and lubricating oil can be prevented from scattering from the motor rotor to the outside of the motor housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing a motor resolver device according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a motor resolver device of a first comparative example. [Figure 3] FIG. 10 is a cross-sectional view showing a main part of a motor resolver device of a second comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 1 is a cross-sectional view showing a motor resolver device according to embodiment 1. The motor resolver device according to embodiment 1 includes a shaft 1, a motor housing 2, a motor stator 3, a motor rotor 4, a resolver stator 5, a resolver rotor 6, a terminal cover 7, and a plurality of lead wires 8.

[0011] The shaft 1 is provided inside the motor housing 2. The shaft 1 is rotatably supported by the motor housing 2 via a pair of bearings (not shown).

[0012] The direction along the axis of the shaft 1 is defined as the axial direction D1. The direction along the radius of a circle centered on the axis of the shaft 1 in a plane perpendicular to the axis of the shaft 1 is defined as the radial direction D2. The direction along the circumference of a circle centered on the axis of the shaft 1 in a plane perpendicular to the axis of the shaft 1 is defined as the circumferential direction D3.

[0013] The motor housing 2 includes a cylindrical portion 21, a disk portion 22, a bottom plate portion 23, a partition portion 24, and a top plate portion 25. The motor housing 2 is made of a non-magnetic material. Specifically, the motor housing 2 is made of aluminum. Therefore, the partition portion 24 is also made of aluminum.

[0014] The cylindrical portion 21 is shaped like a cylinder. The disc portion 22 is shaped like an annulus. Specifically, the disc portion 22 is shaped like a disc, and a hole penetrating in the axial direction D1 is formed in the inner portion in the radial direction D2. The bottom plate portion 23 is shaped like a disc. The partition portion 24 is shaped like a cylinder. The top plate portion 25 is shaped like a disc.

[0015] The cylindrical portion 21 is disposed coaxially with the shaft 1. The disk portion 22 is provided at an end of the cylindrical portion 21 in the axial direction D1. The disk portion 22 protrudes inward from the cylindrical portion 21 in the radial direction D2. The bottom plate portion 23 is provided at an end of the cylindrical portion 21 in the axial direction D1. The bottom plate portion 23 is provided at an end of the cylindrical portion 21 on the opposite side from the disk portion 22 in the axial direction D1.

[0016] The partition portion 24 is disposed coaxially with the shaft 1. The partition portion 24 is disposed so as to extend from an inner portion of the disk portion 22 in the radial direction D2 in the axial direction D1 in a direction away from the bottom plate portion 23. The top plate portion 25 is provided at an end of the partition portion 24 on the opposite side from the disk portion 22 in the axial direction D1.

[0017] The motor stator 3 is formed in an annular shape. The motor stator 3 is arranged coaxially with the shaft 1. The motor stator 3 is provided inside the motor housing 2. Specifically, the motor stator 3 is provided on the inner wall surface of the cylindrical portion 21. The motor stator 3 is arranged between the disk portion 22 and the bottom plate portion 23 in the axial direction D1. Therefore, the partition portion 24 is arranged to extend from the inner part of the disk portion 22 in the radial direction D2 in the axial direction D1 and in a direction away from the motor stator 3.

[0018] The motor stator 3 includes a plurality of coils (not shown). Each of the plurality of coils included in the motor stator 3 is supplied with current from a power supply device (not shown).

[0019] The motor rotor 4 is formed in an annular shape. The motor rotor 4 is arranged coaxially with the shaft 1. The motor rotor 4 is provided inside the motor housing 2. The motor rotor 4 is arranged to face the motor stator 3 in the radial direction D2. The motor rotor 4 is arranged inside the motor stator 3 in the radial direction D2. The motor rotor 4 is fixed to the shaft 1. Therefore, the shaft 1 and the motor rotor 4 rotate integrally in the circumferential direction D3.

[0020] The resolver stator 5 is formed in an annular shape. The resolver stator 5 is arranged coaxially with the shaft 1. The resolver stator 5 is provided on the outside of the motor housing 2. The resolver stator 5 is provided on the disc portion 22. Specifically, the resolver stator 5 is provided on the surface of the disc portion 22 opposite to the surface facing the motor stator 3. The resolver stator 5 is arranged adjacent to the motor stator 3 in the axial direction D1.

[0021] The resolver stator 5 includes a plurality of coils (not shown). Each of the plurality of coils included in the resolver stator 5 is insulated from the disk portion 22.

[0022] The resolver rotor 6 is formed in an annular shape. The resolver rotor 6 is arranged coaxially with the shaft 1. The resolver rotor 6 is provided inside the motor housing 2. The resolver rotor 6 is arranged to face the resolver stator 5 in the radial direction D2. The resolver rotor 6 is arranged inside the resolver stator 5 in the radial direction D2. The resolver rotor 6 is arranged to be adjacent to the motor rotor 4 in the axial direction D1. The resolver rotor 6 is fixed to the shaft 1. Therefore, the shaft 1 and the resolver rotor 6 rotate together in the circumferential direction D3.

[0023] The resolver rotor 6 is disposed inside the partition portion 24. The partition portion 24 is provided between the resolver rotor 6 and the resolver stator 5 in the radial direction D2.

[0024] The motor stator 3, the motor rotor 4 and the resolver rotor 6 are covered by the motor housing 2.

[0025] The terminal cover 7 is provided on the resolver stator 5. The resolver stator 5 includes a plurality of terminals (not shown). Each of the plurality of terminals included in the resolver stator 5 is electrically connected to a corresponding one of the plurality of coils included in the resolver stator 5. The terminal cover 7 is arranged to cover the plurality of terminals included in the resolver stator 5.

[0026] The plurality of lead wires 8 are electrically connected to a plurality of terminals included in the resolver stator 5. The plurality of lead wires 8 are electrically connected to peripheral devices such as an angle detection signal converter (not shown).

[0027] Next, we will explain the operation of the motor resolver device according to embodiment 1. When current is supplied to each of the multiple coils included in the motor stator 3, an electromagnetic force is generated between the motor stator 3 and the motor rotor 4. This causes the shaft 1, motor rotor 4, and resolver rotor 6 to rotate together in the circumferential direction D3.

[0028] As the resolver rotor 6 rotates in the circumferential direction D3, the magnetic resistance between the resolver rotor 6 and the resolver stator 5 changes. As a result, an output signal according to the rotational position of the resolver rotor 6 flows to multiple coils included in the resolver stator 5. Although a partition 24 is disposed between the resolver rotor 6 and the resolver stator 5, the partition 24 does not affect the change in the magnetic resistance between the resolver rotor 6 and the resolver stator 5.

[0029] Lubricating oil is applied to the shaft 1 and the motor rotor 4 to lubricate or cool the motor resolver device. As the shaft 1 and the motor rotor 4 rotate in the circumferential direction D3, the lubricating oil applied to the shaft 1 and the motor rotor 4 splashes from the shaft 1 and the motor rotor 4. Because the motor stator 3, the motor rotor 4, and the resolver rotor 6 are covered by the motor housing 2, the lubricating oil splashed from the shaft 1 and the motor rotor 4 moves inside the motor housing 2. Therefore, the lubricating oil splashed from the shaft 1 and the motor rotor 4 moves to the resolver rotor 6, but does not move to the resolver stator 5. As a result, adhesion of the lubricating oil to the resolver stator 5 is suppressed.

[0030] Next, a motor resolver device of a first comparative example will be described. Fig. 2 is a cross-sectional view showing the motor resolver device of the first comparative example. In the motor resolver device of the first comparative example, the motor housing 2A does not include the partition portion 24 and the top plate portion 25, as compared to the motor resolver device of the first embodiment. The other configurations of the motor resolver device of the first comparative example are similar to the configurations of the motor resolver device of the first embodiment.

[0031] In the motor resolver device of the first comparative example, the motor stator 3, motor rotor 4, and resolver rotor 6 are not covered by the motor housing 2A. As a result, the lubricating oil scattered from the shaft 1 and motor rotor 4 moves not only inside the motor housing 2A but also outside the motor housing 2A. Therefore, the lubricating oil scattered from the shaft 1 and motor rotor 4 moves not only to the resolver rotor 6 but also to the resolver stator 5. As a result, the lubricating oil adheres to the resolver stator 5. The lubricating oil that has adhered to the resolver stator 5 moves to the lead wires 8 and adheres to the lead wires 8. If the lubricating oil adheres to the lead wires 8, the lubricating oil will be transferred to peripheral devices such as an angle detection signal conversion device via the lead wires 8.

[0032] On the other hand, in the motor resolver device according to the first embodiment, the motor stator 3, motor rotor 4, and resolver rotor 6 are covered by the motor housing 2. As a result, the lubricating oil scattered from the shaft 1 and the motor rotor 4 moves to the resolver rotor 6, but does not move to the resolver stator 5. In other words, the lubricating oil is prevented from scattering from the motor rotor 4 to the outside of the motor housing 2. As a result, the lubricating oil is prevented from adhering to the resolver stator 5, and is prevented from adhering to peripheral devices such as the angle detection signal conversion device via the lead wires 8.

[0033] Next, a motor resolver device of a second comparative example will be described. FIG. 3 is a cross-sectional view showing a main portion of the motor resolver device of the second comparative example. In the motor resolver device of the second comparative example, the resolver stator 5 is provided inside the motor housing 2, unlike the motor resolver device of the first embodiment. Furthermore, in the motor resolver device of the second comparative example, a connector 9 is connected to the resolver stator 5, and an O-ring 10 is provided in the gap between the connector 9 and the motor housing 2, unlike the motor resolver device of the first embodiment. As a result, lubricating oil scattered from the shaft 1 and the motor rotor 4 moves not only to the resolver rotor 6 but also to the resolver stator 5. However, since the O-ring 10 is provided in the gap between the connector 9 and the motor housing 2, the lubricating oil adhering to the resolver stator 5 does not move to the lead wires 8. As a result, the lubricating oil is prevented from adhering to peripheral devices such as an angle detection signal conversion device via the lead wires 8. However, the motor resolver device of the second comparative example requires the connector 9 and the O-ring 10, which makes the configuration of the motor resolver device complex.

[0034] On the other hand, the motor resolver device according to the first embodiment does not include the connector 9 and the O-ring 10. This prevents the configuration of the motor resolver device from becoming complicated.

[0035] As described above, the motor resolver device according to the first embodiment includes the motor housing 2, the resolver rotor 6, and the resolver stator 5. The motor stator 3 and the motor rotor 4 are provided inside the motor housing 2. The resolver rotor 6 is provided inside the motor housing 2 and rotates together with the motor rotor 4. The resolver stator 5 is provided outside the motor housing 2 and faces the resolver rotor 6. The motor stator 3, the motor rotor 4, and the resolver rotor 6 are covered by the motor housing 2. The motor housing 2 has a partition 24 provided between the resolver rotor 6 and the resolver stator 5. The partition 24 is made of a non-magnetic material. With this configuration, the motor stator 3, the motor rotor 4, and the resolver rotor 6 are covered by the motor housing 2. This makes it possible to prevent lubricating oil from scattering from the resolver rotor 6 to the outside of the motor housing 2 without providing a connector 9 and an O-ring 10. As a result, the configuration of the motor resolver device can be prevented from becoming complicated, and the lubricating oil can be prevented from scattering from the motor rotor 4 to the outside of the motor housing 2.

[0036] Moreover, in the motor resolver device according to the first embodiment, the motor housing 2 has a cylindrical portion 21 and an annular disk portion 22. The motor stator 3 and the motor rotor 4 are disposed inside the cylindrical portion 21. The disk portion 22 is provided at an end of the cylindrical portion 21 in the axial direction D1 and protrudes inward from the cylindrical portion 21 in the radial direction D2. The partition portion 24 is formed in a cylindrical shape and is disposed so as to extend from the inside of the disk portion 22 in the radial direction D2 in the axial direction D1 and in a direction away from the motor stator 3. With this configuration, the resolver rotor 6 is covered by the motor housing 2, and the distance between the resolver rotor 6 and the resolver stator 5 can be reduced.

[0037] Moreover, in the motor resolver device according to the first embodiment, the resolver stator 5 is provided on the disk portion 22. According to this configuration, the resolver stator 5 can be easily fixed to the motor housing 2.

[0038] Furthermore, in the motor resolver device according to the first embodiment, the motor housing 2 is made of aluminum. This configuration ensures the strength required for the motor housing 2, and also makes it possible to suppress the influence of the partition 24 on changes in magnetic resistance between the resolver rotor 6 and the resolver stator 5.

[0039] In the motor resolver device according to the first embodiment, the motor housing 2 is configured from aluminum. However, this is not limiting. For example, the motor housing 2 may be configured from copper. Alternatively, the motor housing 2 may be configured from resin. Furthermore, the entire motor housing 2 is not limited to being configured from a non-magnetic material, as long as at least the partition portion 24 is configured from a non-magnetic material.

[0040] Furthermore, in the motor resolver device according to embodiment 1, the configuration has been described in which the disk portion 22 is arranged to protrude inward from the cylindrical portion 21 in the radial direction D2. However, this configuration is not limiting. The disk portion 22 may be arranged to protrude outward from the cylindrical portion 21 in the radial direction D2. With this configuration, even if the resolver rotor 6 is arranged outward from the motor stator 3 in the radial direction D2, the motor housing 2 can cover the motor stator 3, the motor rotor 4, and the resolver rotor 6.

[0041] In addition, in the motor resolver device according to the first embodiment, the resolver stator 5 is provided on the disk portion 22. However, this is not the only possible configuration. For example, the resolver stator 5 may be provided on an attachment target member other than the motor housing 2.

[0042] Although the motor resolver device according to the preferred embodiment 1 has been described above, the present invention is not limited to the motor resolver device according to the above-described embodiment 1. Various modifications and conversions can be made to the motor resolver device according to the above-described embodiment 1 without departing from the scope of the claims. [Explanation of symbols]

[0043] 1 shaft, 2 motor housing, 3 motor stator, 4 motor rotor, 5 resolver stator, 6 resolver rotor, 7 terminal cover, 8 lead wire, 21 cylindrical portion, 22 disk portion, 23 bottom plate portion, 24 partition portion, 25 top plate portion.

Claims

1. a motor housing (2) having a motor stator (3) and a motor rotor (4) provided therein; a resolver rotor (6) provided inside the motor housing (2) and rotating together with the motor rotor (4); a resolver stator (5) provided outside the motor housing (2) and facing the resolver rotor (6); Equipped with The motor stator (3), the motor rotor (4), and the resolver rotor (6) are covered by the motor housing (2), The motor housing (2) has a partition portion (24) provided between the resolver rotor (6) and the resolver stator (5), The partition (24) is made of a non-magnetic material.

2. The motor housing (2) a cylindrical portion (21) in which the motor stator (3) and the motor rotor (4) are disposed; an annular disk portion (22) provided at an end of the cylindrical portion (21) in the axial direction and protruding inward from the cylindrical portion (21) in the radial direction; and 2. The motor resolver device according to claim 1, wherein the partition portion (24) is formed in a cylindrical shape and is arranged to extend radially from the inside of the disc portion (22) in the axial direction away from the motor stator (3).

3. The motor housing (2) a cylindrical portion (21) in which the motor stator (3) and the motor rotor (4) are disposed; an annular disk portion (22) provided at an end of the cylindrical portion (21) in the axial direction and protruding outward from the cylindrical portion (21) in the radial direction; and 2. The motor resolver device according to claim 1, wherein the partition portion (24) is formed in a cylindrical shape and is arranged to extend radially from the outside of the disc portion (22) in the axial direction away from the motor stator (3).

4. 3. The motor resolver device according to claim 2, wherein the resolver stator (5) is provided on the disc portion (22).

5. 5. The motor resolver device according to claim 1, wherein the motor housing (2) is made of aluminum.

Images