Motor with encoder
By setting an ear plate on the outer wall of the encoder and bolting it to the rear cover, the problem that the encoder fixing method in the prior art is not conducive to the axial reduction of the motor is solved. This achieves a reduction in the axial size of the motor and an enhancement in connection stability, making it suitable for miniaturized and integrated motor layouts.
Patent Information
- Application Number
- CN202520347965.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-28
AI Technical Summary
In the existing technology, the way the encoder is fixed to the motor housing is not conducive to reducing the axial dimension of the motor, resulting in an additional dimension of the motor as a whole in the axial direction.
The encoder employs a lug plate on its outer wall, which is bolted to the rear end cover. The lug plate and the annular groove can be detachably fitted together to ensure a stable connection. At the same time, a gap is left between the lug plate and the rear end cover to enhance the preload and avoid the need for additional axial connection components.
It reduces the axial dimension of the motor, enhances the connection stability between the encoder and the rear cover, and is suitable for miniaturized and integrated motor layouts.
Smart Images
Figure CN223872163U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a motor with an encoder. Background Technology
[0002] In motor systems, encoders play a crucial role in motion control, and their structural design and installation directly impact the overall layout of the motor. Encoders utilize the collaborative work of photoelectric devices or magnetic elements to convert information such as the angular displacement and angular velocity of the rotating shaft into digital pulse signals in real time, providing vital position feedback information for closed-loop control systems. With the widespread application and in-depth development of motors in fields such as industrial robots and precision medical devices, the spatial layout of motor equipment is constantly evolving towards miniaturization and integration, which places more stringent technical requirements on the compactness of motor structures.
[0003] In current technology, encoders are typically mounted using a split support frame, which is mechanically connected to the encoder by extending the motor housing. Specifically, an independent support structure is installed at the axial end of the encoder, and through-type fasteners are used to securely connect the support frame to the motor housing. However, with this mounting method, the thickness of the support frame's base plate directly results in an additional axial dimension for the entire motor, hindering the reduction of the motor's axial dimensions. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, such as the method of fixing the encoder to the motor housing, which is not conducive to the reduction of the axial dimension of the motor, and to provide a motor with an encoder.
[0005] This utility model provides a motor with an encoder, comprising:
[0006] The encoder has an annular groove on its outer wall and an outwardly extending lug on its outer wall. The lug has a through hole and is detachably fitted into the annular groove.
[0007] The encoder is located on the outside of the rear end cover, and the ear plate is connected to the rear end cover by bolts passing through the through hole.
[0008] There is a gap between the ear plate and the outer surface of the rear end cover.
[0009] This invention provides a motor with an encoder. The annular groove is used to fix the lug plate, which is detachably fitted into the annular groove, simplifying the installation and removal of the lug plate while ensuring a stable connection. The encoder is connected to the outside of the rear end cover via bolts using the lug plate located on the outer wall of the encoder. This connection method does not add additional connecting components along the axial direction of the motor or the encoder, thus reducing the axial dimension of the motor. Furthermore, a gap exists between the lug plate and the outer surface of the rear end cover, allowing for a greater preload force when the lug plate is tightened with bolts, thereby enhancing the stability of the connection between the encoder and the rear end cover.
[0010] Preferably, there are at least two ear plates, and the at least two ear plates are arranged symmetrically along the axis of the encoder. On the rear end cover, a first screw hole corresponding to the position of each ear plate is provided on the structural surface for mounting the encoder. The purpose of the first screw hole is to engage with a bolt to secure the ear plate. Specifically, the bolt passes through a pre-drilled hole on the ear plate and is then inserted into the first screw hole, thereby achieving a secure connection between the two.
[0011] When there are two ear plates, there are also two first screw holes. The positions of the two first screw holes can be configured in the following ways: they can be located at the top and bottom of the vertical direction of the structural surface, or on the left and right sides of the horizontal direction, or distributed on the structural surface at diagonal or non-orthogonal angles.
[0012] Preferably, there are two ear plates, and the structural surface is a square shape with chamfered corners. The first screw holes corresponding to the two ear plates are located at two opposite corners of the square. The encoder has a circular cross-section and is located at the center of the structural surface, which is a square. Due to this layout, the mounting position of the encoder is naturally offset from the four corners of the structural surface. To effectively utilize this spatial layout and reduce the overall radial dimension of the motor, this solution chooses to set two first screw holes at two opposite corners of the structural surface. Compared to arranging the two first screw holes horizontally or vertically on the structural surface, this arrangement avoids the need for a larger rear end cover to accommodate these screw holes, thereby avoiding increasing the overall radial dimension of the motor.
[0013] Preferably, the gap width between the ear plate and the outer surface of the rear end cover is 1.5 mm to 2.5 mm.
[0014] Preferably, the ear plate is an isosceles trapezoidal structural plate, the base shape of which matches the annular groove, and the two apex corners of the structural plate are provided with rounded chamfers. This design can increase the connection length between the ear plate and the annular groove, further stabilizing the connection between the ear plate and the annular groove.
[0015] Preferably, the thickness of the ear plate is 2mm to 3mm.
[0016] Preferably, the rear end cover has a groove that matches the encoder, and the encoder is embedded in the groove. The groove serves to quickly position the encoder during installation, and at the same time, it restricts the movement of the encoder in its radial direction, thereby enhancing the stability of the encoder installation.
[0017] Preferably, it further includes a rear cover for enclosing the encoder, the rear cover being connected to the rear end cover. The rear cover protects the encoder from interference and damage from the external environment.
[0018] The rear cover and the rear end cover can be connected by a snap-fit connection or a bolt connection.
[0019] Preferably, the rear end cover is provided with a second screw hole, and the rear cover is provided with a third screw hole at a position corresponding to the second screw hole. The second screw hole and the third screw hole are used to install bolts to connect the rear cover and the rear end cover.
[0020] Preferably, the rear cover and the rear end cap are provided with through holes. These holes allow gas to circulate between the interior and exterior spaces of the motor. This design enables the motor to be effectively used in a vacuum environment because the holes allow for necessary gas exchange or pressure equalization, thus ensuring the normal operation of the motor in a vacuum environment.
[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0022] 1. This utility model provides a motor with an encoder. The encoder is connected to the rear end cover by a lug plate provided on the outer wall of the encoder and bolts. This connection method does not add any additional connecting parts in the axial direction of the motor and the encoder, thereby achieving the effect of reducing the axial dimension of the motor. Attached Figure Description
[0023] Figure 1 This is the first schematic diagram of the present invention.
[0024] Figure 2 This is a rear view of the encoder position of this utility model.
[0025] Figure 3 This is a second schematic diagram of the present invention.
[0026] Figure 4 This is a side view of the present invention.
[0027] Figure 5 This is a rear view of the rear cover position of this utility model.
[0028] Figure 6 This is the third schematic diagram of the present invention.
[0029] Marked in the image:
[0030] 1-Rear cover,
[0031] 101 - Third screw hole
[0032] 2-Encoder
[0033] 201 - Encoder stator, 202 - Encoder rotor, 203 - Annular groove
[0034] 3-Earplate,
[0035] 4- Rear end cover,
[0036] 401 - First screw hole, 402 - Second screw hole
[0037] 5-Motor stator,
[0038] 6-Front end cap,
[0039] 7-Spindle,
[0040] 8-Wire terminal. Detailed Implementation
[0041] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0042] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] 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.
[0047] Example 1
[0048] like Figures 1 to 6 As shown, a motor with an encoder includes an encoder 2 and a rear cover 4.
[0049] The encoder 2 has an annular groove 203 on its outer wall, and an outwardly extending lug 3 on its outer wall. The lug 3 has a through hole, and the lug 3 is detachably fitted into the annular groove 203. The diameter of the through hole is 3.5 mm. The lug 3 and the outer wall of the encoder 2 are made of the same metal material.
[0050] The encoder 2 is located on the outside of the rear cover 4, and the ear plate 3 is connected to the rear cover 4 by bolts passing through the through hole.
[0051] There is a gap between the ear plate 3 and the outer surface of the rear cover 4.
[0052] The main body of the motor also includes a motor stator 5, a front cover 6, and a rotating shaft 7. The motor stator 5 is located between the front cover 6 and the rear cover 4, forming a fixed internal space. The rotating shaft 7 is a shaft that runs through the entire motor structure. It passes sequentially through the central hole of the front cover 6, the interior of the motor stator 5, and finally through the central hole of the rear cover 4, with its end protruding outward from the outer surface of the rear cover 4. In addition, an encoder 2 is mounted on the part of the rotating shaft 7 that protrudes from the outer surface of the rear cover 4, for encoding and measuring the rotation of the rotating shaft 7.
[0053] The encoder 2 includes an encoder stator 201 and an encoder rotor 202. The encoder rotor 202 is enclosed by the encoder stator 201 and is mounted on a rotating shaft 7. The rotating shaft 7 can drive the encoder rotor 202 to rotate together. The encoder 2 has an axial length of 16 mm and an outer diameter of 37.5 mm.
[0054] In an optional embodiment, the number of ear plates 3 can be at least two, and the at least two ear plates 3 are arranged symmetrically along the axis of the encoder 2; on the rear end cover 4, a first screw hole 401 corresponding to the position of each ear plate 3 is provided on the structural surface for mounting the encoder 2. The diameter of the first screw hole 401 is 3.5 mm.
[0055] In an optional embodiment, there may be two ear plates 3, and the structural surface may be a square shape with chamfers. The first screw holes 401 corresponding to the two ear plates 3 are located at two opposite corners of the square. Specifically, the side length of the square is 42mm, the length of the chamfered side is 6mm, and the chamfer angle is 45°.
[0056] In an optional embodiment, the gap width between the ear plate 3 and the outer surface of the rear cover 4 is 1.5mm to 2.5mm, specifically 1.5mm, 1.8mm, 2.0mm, 2.2mm, or 2.5mm.
[0057] In an optional embodiment, the ear plate 3 can be an isosceles trapezoidal structural plate, the shape of the bottom edge of the structural plate matching the annular groove 203, and the two apex corners of the structural plate having rounded chamfers.
[0058] In an optional embodiment, the thickness of the ear plate 3 is 2mm to 3mm, specifically 2mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, or 3mm.
[0059] In an optional embodiment, the rear cover 4 may have a groove that matches the encoder 2, and the encoder 2 is embedded in the groove. The groove has a diameter of 37.5 mm and a depth of 0.5 mm.
[0060] In an optional embodiment, a rear cover 1 may also be included, which covers the encoder 2 and is connected to the rear end cover 4. A certain gap exists between the encoder 2 and the inner wall of the rear cover 1 to provide tolerance during installation. A wire clamping terminal 8 is also connected to the top of the rear cover 1 and the rear end cover 4. The wire clamping terminal 8 is used to connect wires to the motor, preventing the wires from loosening or falling off.
[0061] In an optional embodiment, the rear end cover 4 may be provided with a second screw hole 402, and the rear cover 1 may be provided with a third screw hole 101 at a position corresponding to the second screw hole 402. The second screw hole 402 and the third screw hole 101 are used to install bolts to connect the rear cover 1 and the rear end cover 4. The diameter of both the second screw hole 402 and the third screw hole 101 is 3.5mm.
[0062] In an optional embodiment, the rear cover 1 and the rear end cover 4 may have through holes, and the front end cover 6 may also have holes. The holes are circular in shape, with a diameter of 4mm to 5mm. The cross-sectional dimensions of the rear cover 1 are the same as those of the rear end cover 4, and it is also a square shape with chamfered corners. The length of the rear cover 1 is 20.5mm.
[0063] 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. A motor with an encoder, characterized in that, include: The encoder (2) has an annular groove (203) on its outer wall and an outwardly extending ear plate (3) on its outer wall. The ear plate (3) has a through hole and is detachably fitted with the annular groove (203). The rear end cover (4) has the encoder (2) located on the outside of the rear end cover (4), and the ear plate (3) is connected to the rear end cover (4) by bolts passing through the through hole; There is a gap between the ear plate (3) and the outer surface of the rear end cover (4).
2. A motor with an encoder according to claim 1, characterized in that, The number of ear plates (3) is at least two, and the at least two ear plates (3) are arranged in a centrally symmetrical manner along the axis of the encoder (2); on the rear end cover (4), a first screw hole (401) corresponding to the position of each ear plate (3) is provided on the structural surface for mounting the encoder (2).
3. A motor with an encoder according to claim 2, characterized in that, There are two ear plates (3), and the structural surface is a square shape with chamfers. The first screw holes (401) corresponding to the two ear plates (3) are located at two opposite corners of the square.
4. A motor with an encoder according to claim 1, characterized in that, The gap width between the ear plate (3) and the outer surface of the rear end cover (4) is 1.5 mm to 2.5 mm.
5. A motor with an encoder according to claim 1, characterized in that, The ear plate (3) is an isosceles trapezoidal structural plate, the shape of the bottom edge of the structural plate matches the annular groove (203), and the two top corners of the structural plate are provided with rounded chamfers.
6. A motor with an encoder according to claim 5, characterized in that, The thickness of the ear plate (3) is 2 mm to 3 mm.
7. A motor with an encoder according to any one of claims 1-6, characterized in that, The rear cover (4) has a groove that matches the encoder (2), and the encoder (2) is embedded in the groove.
8. A motor with an encoder according to claim 7, characterized in that, It also includes a rear cover (1) for covering the encoder (2), and the rear cover (1) is connected to the rear end cover (4).
9. A motor with an encoder according to claim 8, characterized in that, The rear end cover (4) is provided with a second screw hole (402), and the rear cover (1) is provided with a third screw hole (101) at a position corresponding to the second screw hole (402). The second screw hole (402) and the third screw hole (101) are used to install bolts to connect the rear cover (1) and the rear end cover (4).
10. A motor with an encoder according to claim 8, characterized in that, The rear cover (1) and the rear end cover (4) are provided with through holes.