Motor resolver device

Abstract

To provide a motor resolver device capable of suppressing influence of a partition part on electromagnetic induction between a first communication coil and a second communication coil, and constituting the whole of a motor housing with the same material.SOLUTION: The motor resolver device includes a motor housing 2 in which a motor stator 3 and a motor rotor 4 are provided, a resolver rotor 6, a resolver stator 5 having a resolver coil 52, a first communication coil 7 electrically connected to the resolver coil 52, and a second communication coil 8 that communicates with the first communication coil 7 by electromagnetic induction. The motor stator 3, the motor rotor 4, the resolver rotor 6, the resolver stator 5, and the first communication coil 7 are covered by the motor housing 2, the motor housing 2 has a partition 23 provided between the first communication coil 7 and the second communication coil 8, and the partition 23 is made of a non-magnetic metal.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, a resolver rotor, a first communication coil, and a second communication coil. The motor stator, the motor rotor, the resolver stator, the resolver rotor, and the first communication coil are provided inside the motor housing. The second communication coil is provided outside the motor housing. The first communication coil is electrically connected to the resolver coil of the resolver stator. The motor housing has a partition provided between the first communication coil and the second communication coil. Communication between the first communication coil and the second communication coil is performed by electromagnetic induction. By communication between the first communication coil and the second communication coil, signals are transmitted and received between the resolver coil and an angle detection signal conversion device electrically connected to the second communication coil (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 135001 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 partition is made of resin to suppress the influence of the partition on electromagnetic induction between the first communication coil and the second communication coil. Meanwhile, the parts of the motor housing other than the partition are made of metal to ensure the strength of the motor housing. This poses a problem in that the entire motor housing cannot be made of the same material.

[0005] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a motor resolver device that suppresses the influence of the partition on electromagnetic induction between the first communication coil and the second communication coil, and that allows the entire motor housing to be made of the same material. [Means for solving the problem]

[0006] The motor resolver device of the present invention comprises a motor housing having a motor stator and a motor rotor provided inside it, a resolver rotor provided inside the motor housing and rotating together with the motor rotor, a resolver stator having a resolver coil and provided inside the motor housing facing the resolver rotor, a first communication coil provided inside the motor housing and electrically connected to the resolver coil, and a second communication coil provided outside the motor housing and communicating with the first communication coil by electromagnetic induction, the motor stator, motor rotor, resolver rotor, resolver stator and first communication coil being covered by the motor housing, and the motor housing having a partition provided between the first communication coil and the second communication coil, the partition being made of a non-magnetic metal. In the motor resolver device according to the present invention, the partition portion is made of aluminum, copper, or non-magnetic stainless steel. [Effects of the Invention]

[0007] According to the motor resolver device of the present invention, the influence of the partition on the electromagnetic induction between the first communication coil and the second communication coil can be suppressed, and the entire motor housing can be made of the same material. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing a motor resolver device according to a first embodiment. [Figure 2] FIG. 2 is a configuration diagram showing a main part of the motor resolver device of FIG. [Figure 3] FIG. 10 is a cross-sectional view showing a motor resolver device of a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 Fig. 1 is a plan view showing a motor resolver device according to embodiment 1. Fig. 2 is a configuration diagram showing a main part of the motor resolver device of Fig. 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 first communication coil 7, a second communication coil 8, and a plurality of lead wires 9.

[0010] 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).

[0011] 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.

[0012] The motor housing 2 includes a cylindrical portion 21, a bottom plate portion 22, and a partition portion 23. The motor housing 2 is made of a non-magnetic metal. Specifically, the motor housing 2 is made of aluminum. Therefore, the partition portion 23 is also made of aluminum.

[0013] The cylindrical portion 21 is formed in a cylindrical shape. The bottom plate portion 22 is formed in a disc shape. The partition portion 23 is formed in a disc shape.

[0014] The cylindrical portion 21 is disposed coaxially with the shaft 1. The bottom plate portion 22 is provided at one end of the cylindrical portion 21 in the axial direction D1. The partition portion 23 is provided at the other end of the cylindrical portion 21 in the axial direction D1. The bottom plate portion 22 and the partition portion 23 face each other in the axial direction D1.

[0015] 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 bottom plate portion 22 and the partition portion 23 in the axial direction D1.

[0016] The motor stator 3 includes a plurality of motor coils (not shown). Each of the plurality of motor coils included in the motor stator 3 is supplied with current from a power supply device (not shown).

[0017] 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.

[0018] 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 inside the motor housing 2. Specifically, the resolver stator 5 is provided on the inner wall surface of the cylindrical portion 21. The resolver stator 5 is arranged adjacent to the motor stator 3 in the axial direction D1.

[0019] The resolver stator 5 includes a stator core 51 and a plurality of resolver coils 52. The plurality of resolver coils 52 are provided in the stator core 51.

[0020] 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 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 integrally with each other in the circumferential direction D3. In other words, the shaft 1, the motor rotor 4, and the resolver rotor 6 rotate integrally with each other in the circumferential direction D3.

[0021] The first communication coil 7 is provided inside the motor housing 2. The first communication coil 7 is provided on a surface of the partition 23 that faces the inside of the motor housing 2. The first communication coil 7 is electrically connected to a plurality of resolver coils 52.

[0022] The second communication coil 8 is provided on the outside of the motor housing 2. The second communication coil 8 is provided on the surface of the partition 23 that faces the outside of the motor housing 2. Therefore, the partition 23 is disposed between the first communication coil 7 and the second communication coil 8.

[0023] The first communication coil 7 and the second communication coil 8 are arranged adjacent to each other with a partition 23 in between. Communication between the first communication coil 7 and the second communication coil 8 is performed by electromagnetic induction.

[0024] The plurality of lead wires 9 are electrically connected to the second communication coil 8. Peripheral equipment 10 such as an angle detection signal conversion device is electrically connected to the plurality of lead wires 9. Communication is performed between the first communication coil 7 and the second communication coil 8, whereby signals are transmitted and received between the plurality of resolver coils 52 and the peripheral equipment 10.

[0025] The motor stator 3, the motor rotor 4, the resolver stator 5, the resolver rotor 6, and the first communication coil 7 are covered by the motor housing 2.

[0026] Next, we will explain the operation of the motor resolver device according to embodiment 1. When current is supplied to each of the multiple stator 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.

[0027] The rotation of the resolver rotor 6 in the circumferential direction D3 changes the magnetic resistance between the resolver rotor 6 and the resolver stator 5. As a result, output signals according to the rotational position of the resolver rotor 6 flow to the multiple resolver coils 52.

[0028] The output signals flowing through each of the multiple resolver coils 52 are input to the peripheral device 10 through communication between the first communication coil 7 and the second communication coil 8. Although a partition 23 is disposed between the first communication coil 7 and the second communication coil 8, the partition 23 is made of a non-magnetic metal and therefore does not affect communication between the first communication coil 7 and the second communication coil 8 through electromagnetic induction.

[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 off from the shaft 1 and the motor rotor 4. Because the motor stator 3, the motor rotor 4, the resolver stator 5, and the resolver rotor 6 are covered by the motor housing 2, the lubricating oil splashed off from the shaft 1 and the motor rotor 4 moves inside the motor housing 2. Therefore, the lubricating oil splashed off from the shaft 1 and the motor rotor 4 moves to the first communication coil 7, but does not move to the second communication coil 8. As a result, adhesion of the lubricating oil to the second communication coil 8 is suppressed.

[0030] Next, a motor resolver device of a comparative example will be described. Fig. 3 is a cross-sectional view showing the motor resolver device of the comparative example. The motor resolver device of the comparative example differs from the motor resolver device of embodiment 1 in that the partition portion 24 of the motor housing 2A is made of resin. The other configurations of the motor resolver device of the comparative example are similar to the configurations of the motor resolver device of embodiment 1.

[0031] In the motor resolver device of the comparative example, the partition 24 is made of resin to suppress the influence of the partition 24 on electromagnetic induction between the first communication coil 7 and the second communication coil 8. Also, in the motor resolver device of the comparative example, the parts of the motor housing 2A other than the partition 24 are made of aluminum to ensure the strength of the motor housing 2A. Therefore, in the motor resolver device of the comparative example, the entire motor housing 2A cannot be made of the same material.

[0032] On the other hand, in the motor resolver device according to the first embodiment, the partition portion 24 is made of a non-magnetic metal. Therefore, in the motor resolver device according to the first embodiment, the entire motor housing 2 can be made of the same material.

[0033] As described above, the motor resolver device according to the first embodiment includes the motor housing 2, the resolver rotor 6, the resolver stator 5, the first communication coil 7, and the second communication coil 8. 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 has a resolver coil 52 and is provided inside the motor housing 2 facing the resolver rotor 6. The first communication coil 7 is provided inside the motor housing 2 and electrically connected to the resolver coil 52. The second communication coil 8 is provided outside the motor housing 2 and communicates with the first communication coil 7 by electromagnetic induction. The motor stator 3, the motor rotor 4, the resolver rotor 6, the resolver stator 5, and the first communication coil 7 are covered by the motor housing 2. The motor housing 2 has a partition 23 provided between the first communication coil 7 and the second communication coil 8. The partition 23 is made of a non-magnetic metal. With this configuration, the rest of the motor housing 2 can be made of the same material as the partition 23. As a result, the influence of the partition 23 on electromagnetic induction between the first communication coil 7 and the second communication coil 8 is suppressed, and the entire motor housing 2 can be made of the same material. Furthermore, because the partition 23 is made of a non-magnetic metal, the strength of the partition 23 can be improved compared to when the partition 23 is made of resin.

[0034] Furthermore, in the motor resolver device according to the first embodiment, the partition 23 is made of aluminum. This configuration makes it possible to suppress the influence of the partition 23 on electromagnetic induction between the first communication coil 7 and the second communication coil 8, and also ensure the strength required for the partition 23.

[0035] In the motor resolver device according to the first embodiment, the partition 23 is configured from aluminum. However, this is not limiting. For example, the partition 23 may be configured from copper or non-magnetic stainless steel. If the partition 23 is configured from copper, the entire motor housing 2 can be configured from copper. This can improve the overall thermal conductivity of the motor housing 2. Furthermore, if the partition 23 is configured from non-magnetic stainless steel, the entire motor housing 2 can be configured from non-magnetic stainless steel. This can improve the overall rust prevention performance of the motor housing 2.

[0036] Although the motor resolver device according to the preferred embodiment 1 has been described above, it 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]

[0037] 1 shaft, 2 motor housing, 3 motor stator, 4 motor rotor, 5 resolver stator, 6 resolver rotor, 7 first communication coil, 8 second communication coil, 9 multiple lead wires, 21 cylindrical portion, 22 bottom plate portion, 23 partition portion, 51 stator core, 52 resolver coil.

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) having a resolver coil (52), provided inside the motor housing (2), and facing the resolver rotor (6); a first communication coil (7) provided inside the motor housing (2) and electrically connected to the resolver coil (52); a second communication coil (8) provided outside the motor housing (2) and configured to communicate with the first communication coil (7) by electromagnetic induction; Equipped with the motor stator (3), the motor rotor (4), the resolver rotor (6), the resolver stator (5), and the first communication coil (7) are covered by the motor housing (2); The motor housing (2) has a partition (23) provided between the first communication coil (7) and the second communication coil (8), The partition (23) is made of a non-magnetic metal.

2. 2. The motor resolver device according to claim 1, wherein the partition (23) is made of aluminum, copper, or non-magnetic stainless steel.

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