Motor

Abstract

The utility model provides a motor which comprises a rotating shaft, a brake and an encoder, the brake comprises a brake stator iron core, the brake stator iron core is provided with an avoiding hole penetrating through the axial direction of the brake stator iron core, the encoder comprises a coded disc, at least part of the encoder is located in the avoiding hole, and the coded disc is connected with the rotating shaft. According to the utility model, the avoiding hole, which is originally used for avoiding the rotating shaft, on the stator core of the brake is further fully utilized, so that at least part of the encoder is positioned in the avoiding hole, and the coded disc of the encoder is connected with the rotating shaft. In other words, under the condition that the encoder meets the installation requirement, at least part of the encoder coincides with the brake, so that the actual motor length occupied by the encoder and the brake is smaller than the axial thickness of the encoder and the brake, and the axial length of the motor is remarkably reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor design, and particularly relates to a motor. Background Art

[0002] As a motor with closed-loop control, a servo motor has extremely high position, speed and torque accuracy during operation, and is currently widely used in the industries of industrial automation, robotics and machine tools.

[0003] As an important feedback component of the servo motor, the encoder is responsible for real-time feedback of the motor speed and position to the driver. Currently in the industry, due to heat dissipation problems, the encoder is generally installed at the end outside the servo motor body, which greatly increases the length of the motor.

[0004] With the development of servo motor technology, the heat generation of high-power servo motors has been well controlled, and the temperature resistance of the encoder has been continuously improved. It is no longer necessary to place the encoder outside the servo motor body to meet the temperature rise requirements of the encoder. In the prior art, the encoder is located outside the servo motor body, resulting in a large distance between the encoder and the brake along the motor axis, thus leading to a large axial length of the motor. For details, see Figure 7 as shown. Summary of the Utility Model

[0005] Therefore, the utility model provides a motor, which can solve the technical problem of the large axial length of the existing motor.

[0006] To solve the above problems, the utility model provides a motor, comprising: a rotating shaft, a brake and an encoder. The brake includes a brake stator core, and a through hole is formed axially through the brake stator core. The encoder includes a code disk, at least part of the encoder is located in the through hole, and the code disk is connected to the rotating shaft.

[0007] In some embodiments, an installation hole is formed in the code disk, and a plug post is provided at an end of the rotating shaft close to the encoder. The plug post is inserted into the installation hole.

[0008] In some embodiments, a shock-absorbing sleeve is inserted into the installation hole. The shock-absorbing sleeve has a jack, and the plug post is inserted into the jack.

[0009] In some embodiments, the jack gradually narrows from the opening to the bottom of the jack, and the plug post is adapted to the jack.

[0010] In some embodiments, the shock-absorbing sleeve has an extension section located outside the installation hole, and a locking member is provided on the extension section. The locking member is used to lock the shock-absorbing sleeve and the plug post.

[0011] In some embodiments, a groove extending around the insertion post is formed on the insertion post, and the locking member is tightened on the extension section, such that at least a part of the extension section and at least a part of the locking member at the tightened position are recessed into the groove.

[0012] In some embodiments, the encoder further includes a body, the code disk is rotatable relative to the body, the body is connected to the brake stator core, and a rear end cover for protecting the encoder is provided on the encoder housing, and the rear end cover is made of a resin material.

[0013] In some embodiments, the motor further includes a middle end cover and a rear end cover that are snap - connected to each other, and the middle end cover and the rear end cover enclose a receiving cavity, and both the brake and the encoder are located in the receiving cavity.

[0014] In some embodiments, the middle end cover has a first end face facing away from the receiving cavity, a bearing chamber is formed on the first end face, and a bearing is installed in the bearing chamber.

[0015] In some embodiments, a first terminal is provided on the rear end cover, the brake has a first lead wire, the encoder has a second lead wire, and both the first lead wire and the second lead wire are connected to the first terminal.

[0016] A motor provided by the present utility model has the following beneficial effects:

[0017] In this application, the avoidance hole originally used for avoiding the rotating shaft on the brake stator core is further fully utilized, such that at least a part of the encoder is located in the avoidance hole, and the code disk of the encoder is connected to the rotating shaft. That is, when the installation requirements of the encoder are met, at least a part of the encoder coincides with the brake, which makes the actual occupied length of the encoder and the brake in the motor less than the axial thickness of the two, thereby significantly reducing the axial length of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0019] Figure 1 It is a cross - sectional view of the motor according to an embodiment of the present utility model;

[0020] Figure 2 It is a cross - sectional view of the shock absorber sleeve of the motor according to an embodiment of the present utility model inserted into the encoder;

[0021] Figure 3 A cross-sectional view of the encoder of the motor according to an embodiment of the present utility model;

[0022] Figure 4 A schematic diagram of the plug post of the motor according to an embodiment of the present utility model;

[0023] Figure 5 A cross-sectional view of the rear bearing of the motor according to an embodiment of the present utility model installed in the bearing chamber of the middle end cover;

[0024] Figure 6 A cross-sectional view of the middle end cover of the motor according to an embodiment of the present utility model;

[0025] Figure 7 A cross-sectional view of a motor in the prior art.

[0026] The reference numerals are shown as:

[0027] 1, rotating shaft; 2, encoder; 3, brake stator core; 4, avoidance hole; 5, mounting hole; 6, plug post; 7, shock-absorbing sleeve; 8, jack; 9, locking member; 10, groove; 11, elastic sheet; 12, fastener; 13, middle end cover; 14, rear end cover; 15, bearing chamber; 16, bearing; 17, first wiring terminal; 18, first lead wire; 19, second lead wire; 20, motor body; 21, second wiring terminal. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation terms such as "front, rear, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" etc. usually indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0030] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0032] Referring to Figures 1 to 7 As shown, according to an embodiment of the present utility model, a motor is provided, including: a rotating shaft 1, a brake, and an encoder 2. The brake includes a brake stator core 3, and a relief hole 4 penetrating its axial direction is formed on the brake stator core 3. The encoder 2 includes a body and a code disk capable of rotating relative to the body. At least a part of the encoder 2 is located in the relief hole 4, and the code disk is connected to the rotating shaft 1.

[0033] In this technical solution, by making further full use of the relief hole 4 originally used for avoiding the rotating shaft 1 on the brake stator core 3, at least a part of the encoder 2 is located in the relief hole 4, and the code disk of the encoder 2 is connected to the rotating shaft 1. That is, when the installation requirements of the encoder 2 are met, at least a part of it coincides with the brake, which makes the actual occupied length of the encoder 2 and the brake less than the axial thickness of the two, thereby significantly reducing the axial length of the motor. It is known through testing that the total length of the servo motor with the same power is reduced by nearly 20%. Among them, the brake stator core 3 is closer to the tail of the motor than other components of the brake, that is, the brake stator core 3 is closer to the encoder 2 than other components of the brake.

[0034] As a specific implementation manner, an installation hole 5 is formed on the code disk, and the end of the rotating shaft 1 close to the encoder 2 has an insertion post 6, and the insertion post 6 is inserted into the installation hole 5.

[0035] In this embodiment, by providing a plug post 6 at the end of the rotating shaft 1 close to the encoder 2 and constructing a mounting hole 5 on the code disc of the encoder 2, the connection between the encoder 2 and the rotating shaft 1 can be achieved when the plug post 6 is inserted into the mounting hole 5. This design is significantly simpler compared to Figure 7 the connection method of the prior art shown, with many fewer components between the encoder 2 and the end of the rotating shaft 1 facing the encoder 2, reducing the installation steps and significantly lowering the cost.

[0036] Referring to Figure 1 and Figure 2 shown, a shock-absorbing sleeve 7 is inserted into the mounting hole 5. The shock-absorbing sleeve 7 has a jack 8, and the plug post 6 is inserted into the jack 8.

[0037] In this technical solution, by inserting the shock-absorbing sleeve 7 into the mounting hole 5 and inserting the plug post 6 into the jack 8 of the shock-absorbing sleeve 7, not only can the connection between the encoder 2 and the rotating shaft 1 be ensured, but more importantly, the shock-absorbing sleeve 7 can absorb the vibration from the rotating shaft 1, thereby improving the detection accuracy of the encoder 2. Among them, the shock-absorbing sleeve 7 can be made of rubber material and is adhesively fixed in the mounting hole 5.

[0038] Referring to Figure 2 and Figure 4 shown, in the direction from the opening of the jack 8 to the bottom of the jack 8, the jack 8 gradually narrows, and the plug post 6 is adapted to the jack 8.

[0039] In this embodiment, when the jack 8 is an ordinary hole with a constant size, if the plug post 6 is larger than the jack 8, it is necessarily difficult to insert the plug post 6 into the jack 8; if the plug post 6 is smaller than the jack 8, after the plug post 6 is inserted into the jack 8, when the rotating shaft 1 is in a rotating state, the plug post 6 will surely sway in the jack 8. When the jack 8 is a reducing hole and the plug post 6 is adapted to the jack 8, not only is it convenient to insert the plug post 6 into the jack 8, but after the plug post 6 is completely inserted into the jack 8, the plug post 6 and the jack 8 can be tightly fitted, and the situation where the plug post 6 sways in the jack 8 when the rotating shaft 1 is in a rotating state will not occur.

[0040] Referring to Figure 1 and Figure 2 shown, the shock-absorbing sleeve 7 has an extension section located outside the mounting hole 5, and a locking member 9 is provided on the extension section. The locking member 9 is used to lock the shock-absorbing sleeve 7 and the plug post 6.

[0041] In this technical solution, by adding the locking member 9, the connection between the shock-absorbing sleeve 7 and the plug post 6 can be made more firm, thereby making the connection between the encoder 2 and the rotating shaft 1 more firm.

[0042] Referring to Figure 1 , Figure 2 and Figure 4As shown, a groove 10 is formed around the insertion post 6 on the insertion post 6. The locking member 9 is tightened on the extension section, and at least part of the extension section and at least part of the locking member 9 at the tightened position are recessed into the groove 10. This can further make the connection between the shock absorber sleeve 7 and the insertion post 6 more firm, and thus further make the connection between the encoder 2 and the rotating shaft 1 more firm. Among them, the locking member 9 can be a locking spring ring.

[0043] See Figure 1 As shown, the body of the encoder 2 is connected to the brake stator core 3. A rear end cover 14 for protecting the encoder 2 is provided on the outer cover of the encoder 2, and the rear end cover 14 is made of a resin material.

[0044] In this embodiment, when the body of the encoder 2 is connected to the brake stator core 3, it indicates that the body of the encoder 2 is fixed on the brake stator core 3. Then, the rear end cover 14 that protects the encoder 2 does not bear the load. Therefore, the material of the rear end cover 14 can be switched from a metal material to a resin material, thereby reducing costs and the weight of the motor.

[0045] Risk assessment for directly mounting the encoder 2 on the brake stator core 3: The brake will have a certain vibration at the moment of braking, and the vibration transmitted to the encoder 2 will cause abnormal signals of the encoder 2. However, when the brake is braking, the motor body 20 has stopped working, and there is no need for the encoder 2 to continue to feedback the position of the motor rotor. Therefore, it has no impact on the encoder 2.

[0046] See Figure 1 As shown, when the encoder 2 comes from the supplier, a shrapnel 11 for installation is provided on its body. The shrapnel 11 is detachably connected to the brake stator core 3 through a fastener 12, so that the body of the encoder 2 is fixed on the brake stator core 3. Among them, the fastener 12 can be a screw.

[0047] See Figure 1 As shown, the motor of the present application further includes a middle end cover 13 that is snap-connected to the rear end cover 14. Both the brake and the encoder 2 are located in the accommodation cavity formed by enclosing the middle end cover 13 and the rear end cover 14.

[0048] In this technical solution, the motor further includes a front end cover and a housing. The front end cover, the housing, and the middle end cover 13 jointly enclose a motor cavity, and the motor body 20 is located in the motor cavity. The motor body 20 refers to the stator and rotor of the motor. When both the brake and the encoder 2 are located in the accommodation cavity formed by the enclosure of the middle end cover 13 and the rear end cover 14, it indicates that the brake and the encoder 2 are in a relatively enclosed space, that is, the middle end cover 13 isolates the encoder 2 from the motor stator, preventing the internal air of the motor from flowing back and forth, thereby preventing the heat generated by the motor body 20 from being transferred to the encoder 2. At the same time, after both the brake and the encoder 2 are located in the accommodation cavity formed by the enclosure of the middle end cover 13 and the rear end cover 14, the encoder cover can also be cancelled, reducing the number of components and lowering the cost. Further, a second terminal 21 is provided on the housing, and the lead wire of the motor body 20 is connected to the second terminal 21. Among them, the lead wire of the motor body 20 is a power cable, and the second terminal 21 is a power line terminal.

[0049] Refer to Figure 1 、 Figure 5 and Figure 6 As shown, the middle end cover 13 has a first end face facing away from the accommodation cavity, and a bearing chamber 15 is formed on the first end face. A bearing 16 is installed in the bearing chamber 15.

[0050] In this embodiment, the bearing 16 refers to the rear bearing of the motor. When a bearing chamber 15 is formed on the first end face of the middle end cover 13 facing away from the accommodation cavity and the rear bearing is installed in the bearing chamber 15, it is equivalent to the rear bearing being placed in front, in the motor cavity where the motor body 20 is located, which can further reduce the total length of the motor. It can be understood that the bearing 16 is sleeved on the rotating shaft 1, and the rotating shaft 1 passes through the middle end cover 13 and is connected to the code disc of the encoder 2.

[0051] Refer to Figure 1 As shown, a first terminal 17 is provided on the rear end cover 14. The brake has a first lead wire 18, and the encoder 2 has a second lead wire 19. Both the first lead wire 18 and the second lead wire 19 are connected to the first terminal 17. This is equivalent to the lead wires of the encoder 2 and the brake being integrated and led out from the same terminal, which is convenient for assembly. Among them, both the first lead wire 18 and the second lead wire 19 are low-voltage lead wires, the first terminal 17 is a low-voltage line terminal, and the first terminal 17 is provided on the circumferential side wall of the rear end cover 14.

[0052] Finally, it should be noted that the assembly process of the motor is as follows:

[0053] 1. The rear bearing is first installed in the bearing chamber 15 of the middle end cover 13, and then the two are pressed onto the rotating shaft 1 as a whole;

[0054] 2. The hub of the brake is connected to the rotating shaft 1 by an interference fit, and the torque is transmitted through a key;

[0055] 3. Press the brake into the middle end cover 13 with a large interference fit to transfer the braking torque;

[0056] 4. Fix the shock absorber sleeve 7 in the encoder 2 by bonding, then lock the locking part 9 on the extension section of the shock absorber sleeve 7, and then fit the entire encoder 2 onto the plug post 6 of the rotating shaft 1, so that the locking part 9 falls into the groove 10 of the plug post 6 to lock the encoder 2, thereby restricting the freedom degree of the encoder 2. Finally, lock the encoder 2 to the brake stator core 3 with screws;

[0057] 5. Connect the rear end cover to the middle end cover with screws;

[0058] 6. Connect the lead wires of the encoder 2 and the brake to the low-voltage wire terminals, and connect the power cable to the power line terminal.

[0059] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0060] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A motor, characterized in that, It includes a rotating shaft (1), a brake and an encoder (2). The brake includes a brake stator core (3), and an avoidance hole (4) penetrating its axial direction is formed on the brake stator core (3). The encoder (2) includes a code disk. At least part of the encoder (2) is located in the avoidance hole (4), and the code disk is connected to the rotating shaft (1).

2. The motor according to claim 1, wherein An installation hole (5) is formed on the code disk. A plug post (6) is provided at the end of the rotating shaft (1) close to the encoder (2), and the plug post (6) is inserted into the installation hole (5).

3. The motor according to claim 2, characterized in that, A shock-absorbing sleeve (7) is inserted into the installation hole (5). The shock-absorbing sleeve (7) has a jack (8), and the plug post (6) is inserted into the jack (8).

4. The motor according to claim 3, characterized in that, In the direction from the opening of the jack (8) to the bottom of the jack (8), the jack (8) gradually narrows, and the plug post (6) is adapted to the jack (8).

5. The motor according to claim 3, characterized in that, The shock-absorbing sleeve (7) has an extension section located outside the installation hole (5), and a locking member (9) is provided on the extension section. The locking member (9) is used to lock the shock-absorbing sleeve (7) and the plug post (6).

6. The motor according to claim 5, characterized in that A groove (10) surrounding the plug post (6) for one week is formed on the plug post (6). The locking member (9) is tightened on the extension section, and at least part of the extension section and at least part of the locking member (9) at the tightened position are recessed into the groove (10).

7. The electric machine according to any one of claims 1 to 6, characterized in that, The encoder (2) further includes a body. The code disk can rotate relative to the body. The body is connected to the brake stator core (3). A rear end cover (14) for protecting the encoder (2) is provided outside the encoder (2), and the rear end cover (14) is made of resin material.

8. The motor according to any one of claims 1 to 6, characterized in that, It further includes a middle end cover (13) and a rear end cover (14) that are buckled and connected to each other. The middle end cover (13) and the rear end cover (14) enclose a containing cavity, and both the brake and the encoder (2) are located in the containing cavity.

9. The motor according to claim 8, characterized in that, The middle end cover (13) has a first end face facing away from the containing cavity. A bearing chamber (15) is formed on the first end face, and a bearing (16) is installed in the bearing chamber (15).

10. The motor according to claim 8, characterized in that, A first wiring terminal (17) is provided on the rear end cover (14). The brake has a first lead wire (18), and the encoder (2) has a second lead wire (19). Both the first lead wire (18) and the second lead wire (19) are connected to the first wiring terminal (17).

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