Rotary transformer rotor fixing structure, rotary transformer and motor

Abstract

The invention discloses a rotary transformer rotor fixing structure, a rotary transformer and a motor, and the rotary transformer rotor fixing structure is used for fixing a rotary transformer rotor on a motor shaft, and comprises an expanding step part arranged at the open end of a hollow shaft of the rotary transformer and a screw hole part arranged at the end part of the motor shaft; when the hollow shaft of the rotary transformer is mounted on the motor shaft, the diameter-expanding step part is as high as the end part of the motor shaft, or the diameter-expanding step part is relatively high; a fixing screw with a screw head larger than the diameter of the motor shaft is fixed in the threaded hole part, and the screw head abuts against the diameter expanding step part, so that the rotary transformer rotor is fixed on the motor shaft. The motor is suitable for the situation that the outer diameter of the rotary transformer is larger than the inner diameter of the motor shaft, space can be saved, and the overall size of the motor is more compact.

Description

Technical Field

[0001] The invention relates to a rotary transformer rotor fixing structure, a rotary transformer and a motor. Background Art

[0002] like Figure 1 As shown, the rotor of the rotary transformer 520 and the motor 530 are fixed to each other by configuring the hollow shaft of the rotary transformer 520 and the motor shaft 59 to be higher than the rotary transformer housing 51, and then fixing them radially by means of a set screw 54, or cutting threads on the motor shaft 59 and fixing them by means of a nut. Since the motor shaft 59 is higher than the rotary transformer housing 51, the overall size of the motor 530 is relatively large. Japanese Patent Publication No. 2015-87308 discloses a structure for fixing a rotary transformer to a motor, but it is only applicable to the case where the outer diameter of the rotary transformer is smaller than the inner diameter of the motor shaft, and has limitations. Summary of the invention

[0003] Purpose of the invention: The first purpose of the present invention is to provide a rotating transformer rotor fixing structure which is suitable for the situation where the outer diameter of the rotating transformer is larger than the inner diameter of the motor shaft and can make the overall size of the motor more compact; the second purpose of the present invention is to provide a rotating transformer; the third purpose of the present invention is to provide a motor.

[0004] Technical solution: The rotary transformer rotor fixing structure described in the present invention is used to fix the rotary transformer rotor to the motor shaft, including an expanded diameter step portion arranged at the open end of the hollow shaft of the rotary transformer and a screw hole portion arranged at the end of the motor shaft. The diameter of the expanded diameter step portion is larger than the motor shaft, and a fixing screw is screwed into the screw hole portion, and the head of the fixing screw abuts against the expanded diameter step portion.

[0005] Furthermore, the height of the fixing screw head is located below the end surface of the hollow shaft of the rotary transformer.

[0006] Furthermore, when the hollow shaft of the rotary transformer is mounted on the motor shaft, the diameter-enlarged step portion is flush with the end portion of the motor shaft.

[0007] Furthermore, when the hollow shaft of the rotary transformer is mounted on the motor shaft, the diameter-enlarged step portion is higher than the end portion of the motor shaft.

[0008] The rotary transformer of the present invention comprises a rotary transformer hollow shaft, on which a diameter-enlarging step portion constituting the rotary transformer rotor fixing structure is arranged.

[0009] Furthermore, the end of the rotary transformer hollow shaft is flush with the rotary transformer housing.

[0010] The motor of the present invention comprises a motor shaft, and the end of the motor shaft is provided with a screw hole portion constituting the rotating transformer rotor fixing structure.

[0011] Furthermore, the rotary transformer rotor of the rotary transformer is fixed to the motor shaft of the motor by a fixing screw, the diameter of the enlarged diameter step portion is larger than the motor shaft, and the head of the fixing screw abuts against the enlarged diameter step portion.

[0012] Furthermore, the rotary transformer housing is connected to the motor via screws.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0014] The present invention shortens the motor shaft and sets a screw hole for fixing screws at the end of the shaft. In the rotary transformer rotor, the screw head is hidden by setting a diameter expansion step portion on the hollow shaft of the rotary transformer, thereby solving the problem of exposed rotary transformer rotor fixing structure in the prior art. The rotary transformer rotor is fixed to the motor shaft, which can make the overall size of the motor more compact and save space for the motor as a whole. The present invention is suitable for the case where the outer diameter of the rotary transformer (referring to the outer diameter of the rotary transformer housing) is larger than the inner diameter of the motor shaft (the motor shaft is a hollow shaft).

[0015] According to the present invention, when a motor and a brushless resolver are combined, a space-saving product can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the fixed structure of the rotary transformer rotor and the motor in the past;

[0017] Figure 2 Schematic diagram of two rotary transformer rotor fixing structures provided by embodiments of the present invention;

[0018] Figure 3 Schematic diagram of the fixing structure of the rotary transformer rotor and the motor in an embodiment of the present invention;

[0019] Figure 4 yes Figure 1 and Figure 3 A comparison chart of the same scale. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Attached Figures 1 to 4 The reference numerals in the figures are as follows:

[0022] 51, rotary transformer housing; 54, stop screw; 59, motor shaft; 520, rotary transformer; 530, motor;

[0023] 0, rotary transformer stator; 1, rotary transformer rotor; 2, rotary transformer hollow shaft; 3, diameter expansion step; 4, fixing screw; 5, fixing screw head; 6, screw hole; 8, motor shaft end; 9, motor shaft; 10, rotary transformer rotor fixing structure; 20, rotary transformer; 30, motor; S, space saving.

[0024] like Figure 3 As shown, an embodiment of the present invention provides a rotary transformer rotor fixing structure for fixing a rotary transformer rotor 1 to a motor shaft 9. The rotary transformer rotor fixing structure 10 includes an enlarged diameter step portion 3 provided at the open end of a rotary transformer hollow shaft 2 and a screw hole portion 6 provided at an end portion 8 of a motor shaft. The diameter of the enlarged diameter step portion 3 is larger than that of the motor shaft 9. A fixing screw 4 is screwed into the screw hole portion 6. The fixing screw 4 has a fixing screw head 5 that is larger than the diameter of the motor shaft 8. The fixing screw head 5 abuts against the enlarged diameter step portion 3, thereby fixing the rotary transformer rotor 1 to the motor shaft 9. In the fixed state, the enlarged diameter step portion 3 is higher than the end portion 8 of the motor shaft, as shown in FIG. Figure 2 (b) As shown. After the screw head 5 is used to fix, the height of the fixing screw head 5 should be below the end face of the resolver hollow shaft 2. Therefore, when the resolver rotor 1 is fixed to the motor shaft 9, there is no protruding part exceeding the end face of the resolver hollow shaft 2, and compared with the previous fixing method, space S can be saved. Figure 4 shown.

[0025] In another embodiment, when the rotary transformer hollow shaft 2 is mounted on the motor shaft 9 by means of the fixing screw 4, the enlarged diameter step 3 is flush with the motor shaft end 8, as shown in FIG. Figure 2 As shown in (a), the resolver rotor 1 can be fixed to the motor shaft 9 in a space-saving manner.

[0026] The embodiment of the present invention further provides a rotary transformer, the rotary transformer 20 comprises a rotary transformer hollow shaft 2, on which is provided an enlarged diameter step portion 3 constituting the rotary transformer rotor fixing structure of the embodiment of the present invention. The end of the rotary transformer hollow shaft 2 is flush with the rotary transformer housing.

[0027] The embodiment of the present invention further provides a motor, the motor 30 includes a motor shaft 9, and the motor shaft end 8 is provided with a screw hole portion 6 constituting the rotary transformer rotor fixing structure according to the embodiment of the present invention. The rotary transformer rotor 1 of the rotary transformer according to the embodiment of the present invention is fixed to the motor shaft 9 of the motor by a fixing screw 4, the diameter of the enlarged diameter step portion 3 is larger than the motor shaft 9, and the fixing screw head 5 abuts against the enlarged diameter step portion 3. The rotary transformer housing is connected and fixed to the motor 30 by screws.

[0028] In summary, the rotary transformer rotor fixing structure, the rotary transformer and the motor of the present invention can achieve space saving, thereby making the overall size of the motor more compact and achieving space saving of the entire motor.

Claims

1. A rotary transformer rotor fixing structure, used for fixing a rotary transformer rotor (1) to a motor shaft (9), characterized in that: The invention comprises an enlarged diameter step portion (3) arranged at the open end of a rotary transformer hollow shaft (2) and a screw hole portion (6) arranged at the end portion (8) of a motor shaft, wherein the diameter of the enlarged diameter step portion (3) is larger than that of the motor shaft (9), a fixing screw (4) is screwed into the screw hole portion (6), and a fixing screw head (5) abuts against the enlarged diameter step portion (3).

2. The rotary transformer rotor fixing structure according to claim 1, characterized in that: The height of the fixing screw head (5) is located below the end surface of the rotary transformer hollow shaft (2).

3. The rotary transformer rotor fixing structure according to claim 1, characterized in that: When the rotary transformer hollow shaft (2) is mounted on the motor shaft (9), the diameter expansion step (3) is flush with the motor shaft end (8).

4. The rotary transformer rotor fixing structure according to claim 1, characterized in that: When the rotary transformer hollow shaft (2) is mounted on the motor shaft (9), the diameter expansion step (3) is higher than the motor shaft end (8).

5. A rotary transformer, comprising a rotary transformer hollow shaft (2), characterized in that: A diameter-enlarged step portion (3) constituting a rotary transformer rotor fixing structure according to any one of claims 1 to 4 is provided on a rotary transformer hollow shaft (2).

6. The rotary transformer according to claim 5, characterized in that: The end of the rotary transformer hollow shaft (2) is flush with the rotary transformer housing.

7. A motor, comprising a motor shaft (9), characterized in that: A motor shaft end portion (8) is provided with a screw hole portion (6) constituting the rotary transformer rotor fixing structure according to any one of claims 1 to 4.

8. The motor according to claim 7, characterized in that The rotary transformer rotor (1) of the rotary transformer described in claim 5 or 6 is fixed to the motor shaft (9) of the motor by means of a fixing screw (4), the diameter of the expanded diameter step portion (3) is larger than the motor shaft (9), and the fixing screw head (5) abuts against the expanded diameter step portion (3).

9. The motor according to claim 8, characterized in that The rotating transformer housing is connected to the motor by screws.

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