Encoder fixing device for motor and motor

Abstract

The utility model relates to the technical field of encoder installation, in particular to an encoder fixing device for a motor and the motor. The encoder fixing device for the motor comprises an outer cover and an elastic component. The outer cover is provided with a cavity capable of containing an encoder, the two ends of the cavity are an opening and a bottom shell of the outer cover respectively, and the end, provided with the opening, of the outer cover is used for being connected with a shell of a component detected by the encoder. The elastic part is installed on the inner side of the bottom shell of the outer cover and used for abutting against the encoder. The elastic component is installed between the inner side of the outer cover bottom shell and the encoder, so that the encoder can be stably fixed at a preset position, the space required for fixing the whole encoder is reduced, and the effect of reducing the axial installation space of the encoder is further achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to encoder installation technical field, especially relates to a kind of encoder fixing device and motor for motor. BACKGROUND

[0002] In the motor technical field, encoder is widely used in position detection, speed control and motion control as a kind of key feedback element. Encoder converts mechanical signal into electrical signal by detecting the rotation angle or displacement of motor shaft, so as to realize accurate monitoring of motor operating state. However, with the rapid development of industrial automation and intelligent manufacturing, the performance requirements of motor and its encoder are increasing, especially in the application scene of limited space, how to optimize the installation structure of encoder, reduce its occupied space, while maintaining its stability and reliability, has become a problem to be solved.

[0003] The traditional encoder installation mode is usually installed in the end of encoder away from motor with the frame body corresponding to encoder, then the frame body and the shell of motor are connected using long bolt, to fix the encoder stator on the motor shell. However, the frame body has a certain thickness, which will occupy the installation space of encoder in axial direction, and the existence of long bolt will also occupy the installation space of encoder in radial direction, which is not conducive to reducing the installation space of encoder. SUMMARY

[0004] The utility model aims at overcoming the deficiency that encoder uses the fixing mode of frame body and bolt in prior art, which is not conducive to reducing the installation space of encoder, and provides a kind of encoder fixing device and motor for motor.

[0005] In the first aspect, the utility model provides a kind of encoder fixing device for motor, comprising:

[0006] Cover, the cover is equipped with the cavity that can hold encoder, the both ends of the cavity are respectively the opening and bottom shell of the cover, the end of the cover equipped with opening is used to be connected with the shell of the encoder detection component;

[0007] Elastic component, the elastic component is installed in the inside of the bottom shell of the cover, and the elastic component is used to be in contact with the encoder.

[0008] The utility model provides a kind of encoder fixing device for motor, and its design emphasis is how to fix encoder compactly. The specific installation steps are as follows:

[0009] First, the encoder is installed on the corresponding detection component. Then, the elastic component is installed on the inside of the bottom shell of the cover. Next, the open end of the cover is aligned and covers the encoder, ensuring that the elastic component is in contact with the encoder and generates a certain extrusion force. Finally, the open end of the cover is connected to the shell of the detection component, completing the fixation.

[0010] The innovation of the encoder fixing device is to utilize the flexibility of the elastic component. When the elastic component is extruded, it can exert the necessary extrusion force on the encoder, thereby stably fixing it in the predetermined position. Compared with the traditional fixing method, the frame body for fixing the encoder in the traditional method occupies additional thickness, and a gap is required between the frame body and the cover to ensure smooth installation. In the present application, only the elastic component occupies the installation space, reducing the space required for fixing the entire encoder, thereby achieving the effect of reducing the axial installation space of the encoder.

[0011] Compared with the traditional fixing method, in addition to the frame body itself, the matching stud also occupies the installation space of the encoder in the radial direction. In the present application, additional components are avoided in the radial direction of the encoder, thereby achieving the effect of reducing the radial installation space of the encoder.

[0012] The detection component can be a motor shaft of various motors, a rotating shaft of a fan, a transmission shaft, a pulley or a gear in an industrial device, etc.

[0013] The elastic component can be a number of spiral springs, spring sheets or rubber pads, etc.

[0014] Preferably, the elastic component is a circular ring structure. Generally, the cross section of the encoder is circular, therefore, in order to more effectively fix the encoder, the elastic component is designed as a circular ring structure. Accordingly, the first groove matched therewith is also designed in a circular shape to ensure good adaptability.

[0015] The circular ring structure can be a ring-shaped rubber pad, a ring-shaped spiral spring or a ring-shaped wave sheet.

[0016] Preferably, the circular ring structure is a ring-shaped wave sheet. Compared with the ring-shaped rubber pad, the ring-shaped wave sheet has better flexibility characteristics, and can generate greater reaction force when extruded, thereby enhancing the fixing effect of the encoder. In addition, the ring-shaped wave sheet can realize a lower overall height in design, thereby further reducing the installation space required for the encoder in the axial direction.

[0017] The ring-shaped wave-shaped sheet not only has a fixed function, but also can play a shock absorption role.

[0018] The ring-shaped wave-shaped sheet can be made of a material with high toughness, such as spring steel, stainless steel, or nickel-based alloy.

[0019] Preferably, the material of the ring-shaped wave-shaped sheet is stainless steel.

[0020] Preferably, the ring-shaped wave-shaped sheet has at least three wave crests and three wave troughs, the height of the ring-shaped wave-shaped sheet is 0.4mm-1mm, and the thickness of the ring-shaped wave-shaped sheet is 0.1mm-0.3mm.

[0021] The wave crests and the wave troughs can be arranged at uniform or varying intervals along the circumference of the ring-shaped wave-shaped sheet.

[0022] Preferably, the wave crests and the wave troughs are uniformly distributed along the circumference of the ring-shaped wave-shaped sheet.

[0023] Preferably, the inner side of the bottom shell of the outer cover is provided with a first groove matched with the encoder, and the elastic component is installed in the first groove. The main role of the first groove is to more effectively position the elastic component. In addition, the shape of the first groove is designed to match the cross section of the encoder, so that the end surface of the encoder can be embedded in the first groove. This scheme helps to prevent the encoder from moving in the radial direction, thereby enhancing its stability.

[0024] In a second aspect, the utility model provides a motor, including motor shaft, rear end cover, encoder and a kind of encoder fixing device for motor, the motor shaft is outside the rear end cover, the encoder is set in the part of the motor shaft extension, the outer cover of the encoder fixing device covers the encoder and is connected with the rear end cover, and the elastic component of the encoder fixing device is installed between the inner side of the bottom shell of the outer cover and the encoder.

[0025] The utility model provides a motor, the motor rear end cover outside the motor shaft is set with encoder, and the encoder is fixed on the rear end cover of the motor by the outer cover and the elastic component. Compared with traditional motor, the frame for fixing the encoder in it will occupy additional thickness, and clearance needs to be reserved between the frame and the outer cover to ensure smooth installation. In the utility model, only the elastic component occupies installation space, which reduces the space required for fixing the whole encoder, thereby achieving the effect of facilitating the reduction of the length of the whole motor shaft.

[0026] Preferably, a first through hole is arranged on the outer wall of the outer cover, and a second through hole is arranged on the outer wall of the rear end cover.

[0027] The first through hole and the second through hole are beneficial to ensure the circulation of the internal and external gases of the rear end cover and the outer cover, so that the motor can be used in a vacuum environment. In a vacuum environment, if the motor is not properly ventilated, its internal part may be damaged due to the pressure difference. These through holes allow the motor to maintain the balance of internal and external air pressure and ensure the normal operation of the motor in a vacuum environment.

[0028] Preferably, the outer side of the rear end cover is provided with a second groove matched with the encoder. This scheme means that the shape of the second groove is designed to match the cross section of the encoder, so that the end face of the encoder can be embedded in the second groove. This scheme helps to prevent the encoder from moving in the radial direction, thereby enhancing its stability.

[0029] Compared with the prior art, the utility model has the beneficial effects that:

[0030] 1. The utility model provides a kind of encoder fixing device for motor, by installing the elastic component between the outer cover bottom shell inner side and the encoder, the encoder can be stably fixed in predetermined position, this scheme reduces the space required for fixing the encoder as a whole, and then reach the effect of being conducive to reducing the installation space of encoder axial direction.

[0031] 2. The utility model provides a kind of motor, by being equipped with encoder on the motor shaft of the rear end cover outer side of the motor, and the encoder is fixed on the rear end cover of the motor by the outer cover and the elastic component. Reduce the space required for fixing the encoder as a whole, and then reach the effect of being conducive to reducing the length of the overall motor axial direction. DRAWINGS

[0032] Figure 1 It is a front view of the motor of the present application containing part section

[0033] Figure 2 It is a three-dimensional schematic diagram of the motor of the present application.

[0034] Figure 3 It is a three-dimensional schematic diagram of the outer cover.

[0035] Figure 4 It is an oblique sectional view of the outer cover and the annular wave-shaped sheet.

[0036] Figure 5 It is a three-dimensional schematic diagram of the annular wave-shaped sheet.

[0037] Figure 6A three-dimensional schematic view of the rear end cover view.

[0038] Marked in the figure:

[0039] 1 - Cover,

[0040] 101 - First groove, 102 - First through hole,

[0041] 2 - Elastic part,

[0042] 201 - Wave crest, 202 - Wave trough,

[0043] 3 - Motor body,

[0044] 301 - Motor shaft,

[0045] 302 - Front end cover,

[0046] 303 - Stator,

[0047] 304 - Rear end cover,

[0048] 3041 - Second groove, 3042 - Second through hole,

[0049] 4 - Pressing terminal,

[0050] 5 - Encoder,

[0051] 501 - Encoder rotor, 502 - Encoder stator. DETAILED DESCRIPTION

[0052] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as the scope of the above-mentioned subject matter of the utility model being limited to the following embodiments. Any technology realized based on the content of the utility model falls within the scope of the utility model.

[0053] In the description of the embodiments of the utility model, the terms indicating the orientation or positional relationship of "up", "down", "left", "right", "center", "inner", "outer" and the like appear without special indication, which are based on the orientation or positional relationship expressed in the drawings or the orientation or positional relationship of the utility model product / device / apparatus when it is usually used. These terms of orientation or positional relationship are only used to facilitate the description of the utility model scheme or simplify the description in the embodiments, so as to facilitate the quick understanding of the scheme by the technicians, and are not intended to indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, so it cannot be understood as a limitation on the utility model.

[0054] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0055] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0056] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0057] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0058] Example 1

[0059] like Figure 1 and Figure 2 As shown, an encoder fixing device for a motor includes an outer cover 1 and an elastic component 2.

[0060] The outer cover 1 has a cavity that can accommodate the encoder 5. The two ends of the cavity are the opening of the outer cover 1 and the bottom shell, respectively. The end of the outer cover 1 with the opening is used to connect with the outer shell of the component detected by the encoder 5. The connection method can be bolt connection or snap connection.

[0061] The elastic component 2 is installed on the inner side of the bottom shell of the outer cover 1, and the elastic component 2 is used to abut against the encoder 5.

[0062] When the outer cover 1 is installed on the housing of the component detected by the encoder 5, a gap is formed between the inner side of the bottom shell of the outer cover 1 and the encoder 5, which is used to install the elastic component 2. It should be noted that the width of the gap should be less than the overall height of the elastic component 2, so as to ensure that after the outer cover 1 and the elastic component 2 are installed, the elastic component 2 will generate a reaction force due to being pressed, and this reaction force can effectively keep the encoder 5 firmly in the preset position.

[0063] In an optional embodiment, the elastic component 2 can be a circular ring structure.

[0064] In an optional embodiment, the circular ring structure can be a ring-shaped wave sheet, as shown in FIG. 2. Specifically, the ring-shaped wave sheet is a ring sheet structure, which has a wave shape, i.e., has the characteristics of ups and downs or fluctuations. Figure 5

[0065] In an optional embodiment, the material of the ring-shaped wave sheet can be stainless steel. Specifically, the outer diameter of the ring-shaped wave sheet can be 20.8 mm, and the inner diameter can be 18 mm. The ring-shaped wave sheet is installed in the first groove 101, and can be connected by adhesive or spot welding.

[0066] In an optional embodiment, the ring-shaped wave sheet can have at least three wave crests 201 and three wave troughs 202. The height of the ring-shaped wave sheet is 0.4 mm-1 mm, and the specific height can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. The thickness of the ring-shaped wave sheet is 0.1 mm-0.3 mm, and the specific thickness can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0067] The wave crest 201 is a point in the wave shape that is higher than the average height, and the wave trough 202 is a point in the wave shape that is lower than the average height. Specifically, the ring-shaped wave sheet has three wave crests 201 and three wave troughs 202, or the ring-shaped wave sheet has four wave crests 201 and four wave troughs 202, or the ring-shaped wave sheet has five wave crests 201 and five wave troughs 202.

[0068] The height of the ring-shaped wave sheet specifically refers to the vertical distance between the highest point of any one wave crest 201 in the ring-shaped wave sheet and the lowest point of the next wave trough 202 adjacent to the wave crest 201. The thickness of the ring-shaped wave sheet refers to the distance from the bottom to the top of the cross section perpendicular to the ring surface and passing through the wave characteristics (such as the wave crest 201 or the wave trough 202).

[0069] ​In an optional embodiment, the wave crests 201 and the wave troughs 202 can be evenly distributed along the circumference of the ring-shaped wave-shaped sheet. Specifically, when there are three wave crests 201 and three wave troughs 202, the distribution of each of them on the ring-shaped wave-shaped sheet has the following characteristics: the angle between any two adjacent wave crests 201 and the line connecting the center of the ring-shaped wave-shaped sheet is 120°; similarly, the angle between any two adjacent wave troughs 202 and the line connecting the center of the ring-shaped wave-shaped sheet is also 120°. In addition, the angle between each wave crest 201 and its adjacent wave trough 202 and the line connecting the center of the ring-shaped wave-shaped sheet is 60°.

[0070] In an optional embodiment, the inner side of the bottom shell of the outer cover 1 can be provided with a first groove 101 matched with the encoder 5, as shown in Figure 3 and Figure 4 The elastic component 2 is installed in the first groove 101. Specifically, the cross section of the encoder 5 is a circle with a diameter of 20.32 mm, and the first groove 101 is a circular groove with a diameter of 21 mm and a depth of 1 mm.

[0071] Embodiment 2

[0072] As shown in Figure 1 and Figure 2 A motor includes a motor shaft 301, a rear end cover 304, an encoder 5, and an encoder fixing device as described in Embodiment 1.

[0073] The motor shaft 301 extends out of the rear end cover 304, the encoder 5 is sleeved on the part of the motor shaft 301 extending out, the outer cover 1 of the encoder fixing device covers the encoder 5 and is connected with the rear end cover 304, and the elastic component 2 of the encoder fixing device is installed between the inner side of the bottom shell of the outer cover 1 and the encoder 5.

[0074] Specifically, the encoder 5 includes an encoder stator 502 and an encoder rotor 501. The two ends of the encoder stator 502 are respectively abutted with the elastic component 2 and the rear end cover 304, and the encoder stator 502 is fixed relative to the rear end cover 304. The encoder rotor 501 is connected with the part of the motor shaft 301 extending out of the rear end cover 304, and the rotation of the motor shaft 301 drives the rotation of the encoder rotor 501.

[0075] The outer wall of the outer cover 1 is provided with a wire pressing terminal 4, which is used for fixing a cable, and the cable is a power supply line or a data transmission line connected with the encoder 5.

[0076] The motor also includes a stator 303 and a front end cover 302, with the stator 303 fixed between the front end cover 302 and the rear end cover 304. The motor shaft 301, front end cover 302, stator 303, and rear end cover 304 constitute the motor body 3. The front end cover 302 and rear end cover 304 are respectively used to fix corresponding bearings, which are used to fix and support the motor shaft 301. A rotor is fixed on the motor shaft 301 inside the motor body 3, and the rotor is used to drive the motor shaft 301 to rotate.

[0077] The axial length of the motor body 3 housing is 34mm-36mm, and the cross-section of the motor body 3 housing is a square with a side length of 28mm, and the corners of the square are rounded.

[0078] In an optional embodiment, the outer wall of the outer cover 1 may be provided with a first through hole 102, and the outer wall of the rear cover 304 may be provided with a second through hole 3042, such as... Figure 4 and Figure 6 As shown. Specifically, the bottom shell of the outer cover 1 may have six first through holes 102, which are arranged in a ring around the center of the bottom shell of the outer cover 1. The first through holes 102 on the bottom shell of the outer cover 1 may be circular holes, and the diameter of the circular holes may be 2mm to 3mm. On the surface of the rear end cover 304 that contacts the encoder 5, seven second through holes 3042 may be provided, which are arranged in a ring around the center of the surface. The second through holes 3042 on the rear end cover 304 may be circular holes, and the diameter of the circular holes may be 2mm to 3mm.

[0079] In an optional embodiment, the outer side of the rear cover 304 may be provided with a second groove 3041 that matches the encoder 5, such as... Figure 6 As shown. Specifically, the encoder stator 502 has a circular cross-section with a diameter of 20.32 mm, and the second groove 3041 is a circular groove with a diameter of 20.32 mm and a depth of 0.6 mm.

[0080] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An encoder fixing device for a motor, characterized in that, include: The outer cover (1) has a cavity that can accommodate the encoder (5). The two ends of the cavity are the opening of the outer cover (1) and the bottom shell, respectively. The end of the outer cover (1) with the opening is used to connect with the outer shell of the component detected by the encoder (5). An elastic component (2) is installed on the inner side of the bottom shell of the outer cover (1) and is used to abut against the encoder (5).

2. The encoder fixing device for a motor according to claim 1, characterized in that, The elastic component (2) has a circular ring structure.

3. The encoder fixing device for a motor according to claim 2, characterized in that, The annular structure is a ring-shaped wave sheet.

4. The encoder fixing device for a motor according to claim 3, characterized in that, The annular wave sheet is made of stainless steel.

5. The encoder fixing device for a motor according to claim 3, characterized in that, The annular wave plate has at least three peaks (201) and three troughs (202), the height of the annular wave plate is 0.4mm-1mm, and the thickness of the annular wave plate is 0.1mm-0.3mm.

6. The encoder fixing device for a motor according to claim 5, characterized in that, The peaks (201) and troughs (202) are evenly distributed along the circumference of the annular wave plate.

7. The encoder fixing device for a motor according to claim 1, characterized in that, The inner side of the bottom shell of the outer cover (1) is provided with a first groove (101) that matches the encoder (5), and the elastic member (2) is installed in the first groove (101).

8. An electric motor, characterized in that, The device includes a motor shaft (301), a rear end cover (304), an encoder (5), and an encoder fixing device for a motor as described in any one of claims 1-7. The motor shaft (301) extends outside the rear end cover (304), the encoder (5) is sleeved on the extended portion of the motor shaft (301), the outer cover (1) of the encoder fixing device covers the encoder (5) and is connected to the rear end cover (304), and the elastic component (2) of the encoder fixing device is installed between the inner side of the bottom shell of the outer cover (1) and the encoder (5).

9. The motor according to claim 8, characterized in that, The outer wall of the outer cover (1) is provided with a first through hole (102), and the outer wall of the rear cover (304) is provided with a second through hole (3042).

10. The motor according to claim 8, characterized in that, The outer side of the rear cover (304) is provided with a second groove (3041) that matches the encoder (5).

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