EP4684467A1

EP4684467A1 - Motor and machine tool

Info

Publication number: EP4684467A1
Application number: EP23934374.2A
Authority: EP
Inventors: Ling Ling ZOU
Original assignee: Siemens AG; Siemens Corp
Current assignee: Siemens AG; Siemens Corp
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2026-01-28
Also published as: WO2024221169A1; CN120642188A

Abstract

Embodiments of the present application provide motor and a machine tool. The motor includes a motor shaft and an optical encoder; the optical encoder is to be installed on the motor shaft, further includes a balancing disk, configured to be installed on the motor shaft, and located inside the optical encoder, a diameter of a circle formed by balancing holes on the balancing disk is larger than the optical encoder and a fixing element of the optical encoder, so as to enable the balancing holes to be operated without uninstalling the optical encoder; and a cover plate, configured to be located between the balancing disk and the optical encoder, and fixed on an end shield, the cover plate comprises: at least one operation window for exposing some of the balancing holes; and a mounting structure for fixing the fixing element of the optical encoder. The technical solutions of the present application can install a balancing disk on a motor.

Description

MOTOR AND MACHINE TOOL

FIELD

The present application relates to mechanical technologies, and more particularly, to a motor and a machine tool.

BACKGROUND

In the machine tool industry, as the requirement of users for machine tool vibration is higher and higher, the requirement of dynamic balancing level of the motor is also increasing. Many users do the dynamic balancing on the motor before the motor is installed into the machine tool.
Figure 1 is a schematic diagram illustrating a balancing disk. The balancing disk 1can be installed on the end of a motor shaft of a motor, and the user can install screws into the balancing holes 11 of the balancing disk 1 to remove the unbalancing mass. However, for motors with an optical encoder, the optical encoder is installed at the end of the motor shaft and covers the motor shaft, so it is impossible to install a balancing disk at the end of the motor shaft.
Therefore, those skilled in the art are committed to finding solutions for installing a balancing disk on a motor.
SUMMARY
According to embodiments of the present application, a motor and a machine tool are provided to install a balancing disk on a motor.
The motor provided by embodiments of the present application includes: a motor shaft, an optical encoder and an end shield; the optical encoder is to be installed on the motor shaft; further includes a balancing disk, configured to be installed on the motor shaft, and located inside the optical encoder, a diameter of a circle formed by balancing holes on the balancing disk is larger than that of each of the optical encoder and a fixing element of the optical encoder, so as to enable the balancing holes to be operated without uninstalling the optical encoder; and a cover plate, configured to be located between the balancing disk and the optical encoder, and fixed on the end shield, the cover plate comprises: at least one operation window for exposing some of the balancing holes; and a mounting structure for fixing the fixing element of the optical encoder.
The machine tool provided by embodiments of the present application includes: the motor mentioned above.
It can be seen from the above technical solutions in embodiments of the application, since the cover plate including mounting structure and operation window is provided between the balancing disk and the optical encoder, the fixing element of the optical encoder can be fixed on the mounting structure, and balancing holes on the balancing disk can be operated through the operation window, thus the balance adjustment can be achieved at the user side, and the vibration of the machine is improved

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present application, reference should be made to the Detailed Description below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures.
Figure 1 is a schematic diagram illustrating a balancing disk.
Figure 2 is a schematic diagram illustrating a motor with a balancing disk.
Figure 3 is a schematic diagram illustrating a motor with a balancing disk according to embodiments of the present application.
Figures 4 and 5 are respectively a schematic diagram illustrating a motor with a cover plate according to embodiments of the present application.
The reference numerals are as follows:

DETAILED DESCRIPTION

At present, some motors with balancing disk uses a gear encoder instead of optical encoder. Figure 2 is a schematic diagram illustrating a motor with a balancing disk. As shown in figure 2, a gear 21 of the gear encoder 2 is fixed on the motor shaft 3, and an encoder measuring head 22 of the gear encoder 2 is fixed on the end shield 4 by the side of the gear 21, and then the balancing disk 1 can be installed on the end of the motor shaft 3. However, the gear encoder 2 is more expensive, and the resolution ratio thereof is usually lower than that of an optical encoder.
In order to install the balancing disk on a motor with an optical encoder, it is considered to install the balancing disk on the motor shaft before installing the optical encoder. Figure 3 is a schematic diagram illustrating a motor with a balancing disk according to embodiments of the present application. As shown in figure 3, the motor includes a motor shaft 3, an optical encoder 5, a balancing disk 1 and an end shield 4. The optical encoder 5 is installed on the motor shaft 3. The balancing disk 1 is also installed on the motor shaft 3, and is located inside the optical encoder 5. The balancing holes 11 on the balancing disk 1 forms a circle. The diameter of the circle is larger than that of each of the optical encoder 5 and a fixing element 51 of the optical encoder 5, so that the balancing holes 11 can be operated without uninstalling the optical encoder 5. In the embodiment shown in figure 3, the fixing element 51 is a torque arm. In another embodiment, the fixing element 51 may be a flange of a housing of the optical encoder 5, or may include two support arms extending from the housing of the optical encoder 5, or may be other structure capable of achieving the fixed installation of the optical encoder 5.
However, in figure 3, the structure to fix the fixing element 51 onto the end shield 4 is covered by the balancing disk 1, thus it is impossible for the fixing element 51 to be fixed on the end shield 4.
In order to solve the above problem, a cover plate is considered to be provided in embodiments of the present application.
Reference will now be made in detail to examples, which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. Also, the figures are illustrations of an example, in which assemblies shown in the figures are not necessarily essential for implementing the present application. In other instances, well-known assemblies, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the examples.
Figures 4 and 5 are respectively a schematic diagram illustrating a motor with a cover plate according to embodiments of the present application.
As shown in figures 4 and 5, the motor further includes a cover plate 6. The cover plate 5 is located between the balancing disk 1 and the optical encoder 5, and fixed on the end shield 4. The cover plate 6 includes at least one operation window 61 for exposing some of the balancing holes 11, and a mounting structure 62 for fixing the fixing element 51 of the optical encoder 5.
In the embodiment, the mounting structure 62comprises two bosses 621, each of which comprises a screw hole 622. The fixing element 51 of the optical encoder 5can be fixed on the cover plate 6 through screws 7 and the screw holes 622. Of course, in other embodiment, if the cover plate 5 is thick enough, there may be not the bosses 621, and the screw holes 622 may be directly set on the surface of the cover plate 6. In another embodiment, there may be not the screw holes 622, that is to say, the fixing element 51 of the optical encoder 5 can be fixed on the cover plate 6 through rivet joint structure.
As shown in figures 4 and 5, the at least one operation window 61 is used to expose some of the balancing holes 11, so that the user can see the balancing holds 11 and perform balance adjustment through the exposed balancing holes 11. When performing the balance adjustment, it is not necessary for the user to see all of the balancing holes 11, because when an unbalance mass is found, the user rotates the motor shaft 3 until the unbalance mass arrives at a zero scale position (for example, 0° position) which is set in the balancing machine, then use the balancing hole at the zero scale position to do balancing adjustment. Therefore, the at least one operation window 61includes a window area whose position corresponds to the zero scale position of the balancing machine when the motor is positioned on the balancing machine.
The zero scale position is usually at the middle-top of the motor, so the at least one operation window 61 may be one operation window 61 which is set at the middle-top of the motor as shown in figure 4, namely the motor comprises only one balance adjusting direction, and the position of the operation window 61corresponds to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to the balance adjusting direction.
There may be a possibility that the zero scale position is not at the middle-top of the motor, but at the side of the motor. Considering this possibility, the operation window can be optimized to a shape and position shown in figure 5, so the balancing holes on middle-top and that on middle-side are both visible. Meanwhile, the mounting structure 62 for fixing the fixing element 51 is adjusted to a 45° position. That is to say, the motor can have two adjusting directions, namely a first balance adjusting direction and a second balance adjusting direction; the at least one operation window 61are two operation windows 61, each of which comprises a first window area 611 corresponding to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to the first balance adjusting direction, and a second window area 612 corresponding to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to the second balance adjusting direction.
Alternatively, the cover plate 6 may be rotatable around the end shield 4, at this time, the at least one operation window 61 may be one operation window 61, and when the motor is positioned on the balancing machine, the operation window 61 can be rotated to a position corresponding to the zero scale position of the balancing machine.
Embodiments of the present application also provide a machine tool which includes the motor mentioned above.
It can be seen from the above technical solutions in embodiments of the application, since the cover plate including mounting structure and operation window is provided between the balancing disk and the optical encoder, the fixing element of the optical encoder can be fixed on the mounting structure, and balancing holes on the balancing disk can be operated through the operation window, thus the balance adjustment can be achieved at the user side, and the vibration of the machine is improved.
It should be understood that, as configured herein, unless the context clearly supports exceptions, the singular forms "a" ( "a" , "an" , "the" ) are intended to include the plural forms. It should also be understood that, "and /or" configured herein is intended to include any and all possible combinations of one or more of the associated listed items.
The number of the embodiments of the present application are only configured for description, and do not represent the merits of the implementations.
The foregoing description, for purpose of explanation, has been described with reference to specific examples. However, the illustrative discussions above are not intended to be exhaustive or to limit the present application to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The examples were chosen and described in order to best explain the principles of the present application and its practical applications, to thereby enable others skilled in the art to best utilize the present application and various examples with various modifications as are suited to the particular use contemplated.

Claims

A motor, comprising a motor shaft (3) , an optical encoder (5) and an end shield (4) ; the optical encoder (5) is to be installed on the motor shaft (3) ; characterized in that, further comprising:

a balancing disk (1) , configured to be installed on the motor shaft (3) , and located inside the optical encoder (5) , a diameter of a circle formed by balancing holes (11) on the balancing disk (1) is larger than that of each of the optical encoder (5) and a fixing element (51) of the optical encoder (5) , so as to enable the balancing holes (11) to be operated without uninstalling the optical encoder (5) ; and

a cover plate (6) , configured to be located between the balancing disk (1) and the optical encoder (5) , and fixed on the end shield (4) , the cover plate (6) comprises: at least one operation window (61) for exposing some of the balancing holes (11) ; and a mounting structure (62) for fixing the fixing element (51) of the optical encoder (5) .
The motor according to claim 1, characterized in that, wherein the mounting structure comprises two bosses, each of which comprises a screw hole.
The motor according to claim 1, characterized in that, the at least one operation window (61) comprises a window area whose position corresponds to zero scale position of a balancing machine when the motor is positioned on the balancing machine.
The motor according to claim 3, characterized in that, the at least one operation window (61) are one operation window, and the cover plate (6) is rotatable; when the motor is positioned on the balancing machine, the operation window (61) is rotated to a position corresponding to the zero scale position of the balancing machine.
The motor according to claim 3, characterized in that, the cover plate (6) is not rotatable; the at least one operation window (61) are one operation window, and the position of the operation window (61) corresponds to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to a balance adjusting direction.
The motor according to claim 3, characterized in that, the cover plate (6) is not rotatable; the at least one operation window (61) are two operation windows, each of which comprises a first window area (611) corresponding to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to a first balance adjusting direction, and a second window area (612) corresponding to the zero scale position of the balancing machine when the motor is positioned on the balancing machine according to a second balance adjusting direction.
The motor according to any one of claims 1 to 6, characterized in that, the fixing element (51) is a torque arm, or is a flange of a housing of the optical encoder (5) , or comprises two support arms extending from the housing of the optical encoder (5) .
A machine tool, characterized in that, comprising a motor according to any one of claims 1 to 7.