Brushless motor with encoder

Abstract

The utility model discloses a brushless motor with an encoder, belongs to the field of driving devices, and solves the problems that a brushless motor in the prior art is large in size and the encoder is exposed in an external environment. According to the technical scheme for solving the problem, the motor mainly comprises a rotating shaft, a rotor shell connected to the rotating shaft and a stator support located between the rotating shaft and the rotor shell, the rotating shaft is sleeved with an encoder, the stator support is provided with a containing cavity for containing the encoder, and the rotating shaft is provided with a first supporting step located in the containing cavity; the stator support is also provided with a protection plate which closes the accommodating cavity and compresses the encoder on the first support step. The brushless motor provided by the utility model is mainly used for realizing closed installation of the encoder and simultaneously enabling the structure of the brushless motor to be more compact.

Description

Technical Field

[0001] This utility model relates to the field of drive devices, and in particular to a brushless motor with an encoder. Background Technology

[0002] Existing structures use Hall effect sensors for signal feedback. However, due to the size of the Hall effect sensor itself and the required detection space, it cannot be installed in space-constrained motor structures. Therefore, some existing technologies use encoders instead of Hall effect sensors in brushless motors. For example, utility model patent CN216312884U discloses an encoder mounting base located at one end of the motor cover. The encoder mounting base has a first mounting ear and a second mounting ear facing upwards, and the encoder is connected to the first and second mounting ears by screws. However, an encoder and encoder mounting base located outside the motor increase the axial dimension and size of the motor. Furthermore, the encoder is directly exposed to the external environment, and dust, sand, and other small particles may enter the encoder, causing mechanical wear or hindering the normal operation of moving parts, thus affecting the encoder's lifespan. Utility Model Content

[0003] The purpose of this invention is to provide a brushless motor with an encoder, which solves the problems of large size and exposed encoder in existing brushless motors, and makes the structure of the brushless motor more compact while achieving enclosed encoder installation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a brushless motor with an encoder, comprising a rotating shaft, a rotor housing connected to the rotating shaft, and a stator support located between the rotating shaft and the rotor housing. The encoder is sleeved on the rotating shaft, and the stator support is provided with a receiving cavity for accommodating the encoder. The rotating shaft is provided with a first support step located in the receiving cavity, and the stator support is also provided with a protective plate that closes the receiving cavity and presses the encoder onto the first support step.

[0005] After adopting the above technical solution, this utility model has the following advantages: First, by directly mounting the encoder on the rotating shaft and providing a dedicated cavity for the encoder in the stator bracket, the encoder is integrated into the brushless motor, making reasonable use of the internal space of the motor, especially the radial space of the rotating shaft. There is no need to reserve external space for the encoder separately, making the overall structure of the motor more compact. Second, the encoder is fixed to the first support step and pressed by the protective plate, which ensures the stability of the encoder during operation as much as possible, reduces the risk of displacement or loosening caused by vibration and other factors, simplifies the installation process of the encoder, and improves assembly efficiency. At the same time, the protective plate closes the cavity, which can effectively prevent the entry of external dust, sand and other small particles, reduce wear on the internal structure of the encoder, ensure the normal operation of the internal structure of the encoder, and thus ensure the service life of the encoder.

[0006] Furthermore, the inner wall of the receiving cavity is provided with a second supporting step surrounding the first supporting step, the inner ring of the encoder is supported on the first supporting step, and the outer ring of the encoder is supported on the second supporting step.

[0007] By adopting the above technical solution and through the design of double support steps, the encoder not only receives support from the first support step on its inner ring, but also receives additional support from the second support step on its outer ring. This allows the mechanical load borne by the encoder to be more evenly distributed between the inner and outer rings, reducing the pressure concentration phenomenon at a single support point. This helps to ensure the service life of the encoder and can also greatly improve the overall stability and balance of the encoder during operation, reducing errors caused by vibration or imbalance.

[0008] Furthermore, the stator support is provided with a stop step. When the protective plate is installed, the protective plate is deformed under pressure and tightly locked onto the stop step.

[0009] By adopting the above technical solution, the protective plate can be firmly installed without complicated fixing devices or additional fasteners by using the stop step and utilizing the deformation characteristics of the protective plate. This makes the assembly process simpler and faster. At the same time, the protective plate can fit tightly against the stop step, effectively preventing external dust, moisture and other contaminants from entering the housing cavity where the encoder is located, thus further protecting the encoder.

[0010] Furthermore, the protective plate is provided with grooves that facilitate deformation.

[0011] Using the above technical solution, the presence of the groove makes the protective plate more prone to elastic deformation during installation. When the protective plate is pressed into the stop step, the clearance hole allows for greater material movement, thus making it easier to adjust the shape to fit tightly against the stop step.

[0012] Furthermore, the stator support includes an outward protrusion and a body portion connected to the outward protrusion. The outward protrusion protrudes from the body portion along the axial direction of the rotating shaft to form a stop step between the outward protrusion and the body portion. Multiple outward protrusions are spaced apart along the circumferential direction of the rotating shaft, and a clearance space is formed between two outward protrusions to facilitate the disassembly of the protective plate.

[0013] By adopting the above technical solution, the stop step formed between the main body and the protruding part can provide a clear and stable positioning point for the protective plate. The design of the protruding part being spaced out along the circumferential direction and leaving clearance provides an operating clearance for the tool, allowing technicians to more easily approach and remove the protective plate.

[0014] Furthermore, an armature winding is wound on the main body, and the main body is provided with ventilation holes. The ventilation holes are isolated from the receiving cavity and are not connected to each other. The ventilation holes are connected to the clearance space to form a heat dissipation channel.

[0015] By adopting the above technical solution, the ventilation holes are isolated from the housing cavity and not connected to each other, which ensures that the space where the encoder is located is not affected by dust, moisture and other pollutants in the outside air. At the same time, the ventilation holes are connected to the clearance space to form a heat dissipation channel, which can effectively manage the heat dissipation of the stator support and armature winding, allowing heat to be directly discharged from the heat dissipation channel without affecting the area where the encoder is located, which is sensitive to the environment.

[0016] Furthermore, the rotating shaft is provided with a threaded hole, the protective plate is provided with a mounting hole, the protective plate and the rotating shaft are connected by screws, the screws pass through the mounting hole and are locked in the threaded hole.

[0017] Using the above technical solution, the pressure applied by the screws can make the protective plate fit tightly against the first stop step of the stator bracket. The screw connection method is relatively simple and direct, and facilitates quick installation and disassembly.

[0018] Furthermore, the encoder and the shaft are bonded together with adhesive.

[0019] By adopting the above technical solution, adhesive bonding can ensure a firm connection between the encoder and the shaft as much as possible, while reducing the need for additional parts, simplifying the internal structure design of the motor, saving space and reducing the overall weight, making the motor design more compact and efficient.

[0020] Furthermore, the side wall of the rotating shaft is provided with a receiving groove, and a glue-filling cavity is formed between the receiving groove and the inner wall of the encoder.

[0021] By adopting the above technical solution, when assembling the encoder and the shaft, the glue is filled into the receiving groove before the encoder is inserted to mate with the shaft. The receiving groove and the inner wall of the encoder form a glue cavity to ensure the bonding effect of the glue. The glue cavity not only clearly defines the location of glue application, but also controls the specific amount of glue required, avoiding the overflow problem caused by excessive use of glue, and also preventing the situation where insufficient glue affects the bonding effect.

[0022] Furthermore, the side wall of the rotating shaft is provided with an external thread, the encoder is provided with an internal thread, and the encoder and the rotating shaft are connected by the internal and external threads.

[0023] By adopting the above technical solution, the encoder and the rotating shaft are directly connected without the need for additional parts, making the assembly process simpler and more direct. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a brushless motor with an encoder in Embodiment 1 of this utility model;

[0026] Figure 2 This is a structural schematic diagram of the brushless motor with encoder in Embodiment 1 of this utility model from another perspective;

[0027] Figure 3 This is a cross-sectional view of a brushless motor with an encoder according to Embodiment 1 of this utility model.

[0028] Figure 4 This is a cross-sectional view of the brushless motor with encoder in Embodiment 1 of this utility model from another perspective.

[0029] Figure 5 This is a cross-sectional view of the brushless motor with encoder in Embodiment 2 of this utility model;

[0030] Figure 6 This is a cross-sectional view of the brushless motor with encoder in Embodiment 3 of this utility model;

[0031] Figure 7 This is a cross-sectional view of the brushless motor with encoder in Embodiment 4 of this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the rotating shaft in Embodiment 4 of this utility model;

[0033] In the figure, 11 is the rotating shaft; 111 is the first support step; 112 is the threaded hole; 113 is the external thread; 114 is the receiving groove; 12 is the rotor housing; 13 is the stator support; 131 is the receiving cavity; 132 is the second support step; 133 is the stop step; 134 is the clearance space; 135 is the main body; 136 is the outward protrusion; 137 is the ventilation hole; 138 is the heat dissipation channel; 14 is the bearing; 15 is the protective plate; 151 is the groove; 152 is the mounting hole; 20 is the encoder; 201 is the internal thread; 30 is the screw; and 40 is the glue cavity. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0035] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein.

[0036] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0037] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0038] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0039] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0040] like Figures 1 to 4 As shown, this utility model provides a brushless motor with an encoder for driving the movement of a load, mainly used in industrial robotic arms. The brushless motor with encoder 20 includes a rotating shaft 11, a rotor housing 12 connected to the rotating shaft 11, and a stator support 13 located between the rotating shaft 11 and the rotor housing 12. The stator support 13 is rotatably connected to the rotor housing 12 via bearings 14. The encoder 20 is mounted on the rotating shaft 11, and the stator support 13 has a receiving cavity 131 for accommodating the encoder 20. The rotating shaft 11 has a first support step 111 located in the receiving cavity 131, and the stator support 13 also has a protective plate 15 that closes the receiving cavity 131 and presses the encoder 20 against the first support step 111.

[0041] First, by directly mounting the encoder 20 onto the rotating shaft 11, and with the stator bracket 13 having a dedicated receiving cavity 131 for accommodating the encoder 20, the encoder 20 is integrated into the brushless motor, making reasonable use of the internal space of the motor, especially the radial space of the rotating shaft 11. This eliminates the need to reserve external space for the encoder 20, resulting in a more compact overall motor structure. Second, the encoder 20 is fixed to the first support step 111 and pressed tightly by the protective plate 15, ensuring the stability of the encoder 20 during operation as much as possible and reducing the risk of displacement or loosening due to vibration or other factors. This also simplifies the installation process of the encoder 20 and improves assembly efficiency. Simultaneously, the protective plate 15 closes the receiving cavity 131, effectively preventing the entry of external dust, sand, and other small particles, reducing wear on the internal structure of the encoder 20, ensuring the normal operation of the internal structure of the encoder 20, and thus guaranteeing the service life of the encoder 20.

[0042] It should be noted that the encoder 20 has a rotating shaft with a connecting through hole, which is fitted onto the rotating shaft 11, allowing the rotating shaft of the encoder 20 and the rotating shaft 11 of the brushless motor to rotate synchronously. To further improve the connection stability between the encoder 20 and the rotating shaft 11, a tenon can be provided on the inner wall of the connecting through hole, and a tenon can be provided on the rotating shaft. The engagement of the tenon and the tenon will make the encoder 20 and the rotating shaft 11 more stably connected.

[0043] It should be noted that the brushless motor also includes permanent magnets, armature windings, position sensors, and an electronic controller. The permanent magnets are mounted on the inner surface of the rotor housing 12, providing a magnetic field. The armature windings (coils) are conductive coils fixed to the stator support 13. When current flows through these coils, an electromagnetic field is generated, interacting with the permanent magnets on the rotor housing 12 to produce rotational motion. The position sensor detects the position of the rotor housing 12, providing signals to the electronic controller to precisely control the energizing sequence and timing of the armature windings, achieving efficient motor operation. Common position sensors include Hall effect sensors. The electronic controller (inverter) is a crucial component of the brushless motor. It is responsible for converting DC power to AC power and adjusting the direction and magnitude of the current based on information provided by the position sensor to ensure the motor operates as needed.

[0044] It should be noted that the rotor housing 12 is arranged around the entire stator support 13, the rotating shaft 11 extends out from the front end of the brushless motor, and the encoder 20 is located at the rear end of the brushless motor.

[0045] To further improve the installation reliability of the encoder 20, the inner wall of the receiving cavity 131 is provided with a second support step 132 surrounding the first support step 111. The inner ring of the encoder 20 is supported on the first support step 111, and the outer ring of the encoder 20 is supported on the second support step 132. This allows the mechanical load borne by the encoder 20 to be more evenly distributed between the inner and outer rings, reducing the pressure concentration phenomenon at a single support point. This helps to ensure the service life of the encoder 20 and can also greatly improve the overall stability and balance of the encoder 20 during operation, reducing errors caused by vibration or imbalance.

[0046] To facilitate the installation of the protective plate 15, the protective plate 15 is made of a deformable material. The stator bracket 13 is provided with a stop step 133. When installing the protective plate 15, the protective plate 15 is deformed under pressure and tightly locked onto the stop step 133. The protective plate 15 can be firmly installed without complicated fixing devices or additional fasteners, making the assembly process simpler and faster. At the same time, the protective plate 15 can fit tightly against the stop step 133, effectively preventing external dust, moisture and other contaminants from entering the receiving cavity 131 where the encoder 20 is located, further protecting the encoder 20.

[0047] To facilitate the installation of the protective plate 15, the protective plate 15 is provided with grooves 151 that facilitate deformation. The presence of grooves 151 makes it easier for the protective plate 15 to undergo elastic deformation during installation. When the protective plate 15 is pressed into the stop step 133, the clearance hole allows for greater material movement, thereby making it easier to adjust its shape to fit tightly against the stop step 133. Multiple grooves 151 may be provided.

[0048] Specifically, the stator support 13 includes an outward protrusion 136 and a body portion 135 connected to the outward protrusion 136. The outward protrusion 136 protrudes from the body portion 135 along the axial direction of the rotating shaft 11 to form a stop step 133 between the outward protrusion 136 and the body portion 135, which can provide a clear and stable positioning point for the protective plate 15. In order to facilitate the disassembly of the protective plate 15, multiple outward protrusions 136 are spaced apart along the circumferential direction of the rotating shaft 11, and a clearance space 134 is formed between two outward protrusions 136 to facilitate the disassembly of the protective plate 15, providing an operating clearance for tools and allowing technicians to more easily approach and remove the protective plate 15.

[0049] It should be noted that in this embodiment, two protrusions 136 are provided, which are arranged opposite to each other on both sides of the rotating shaft 11. Between the two protrusions 136, two clearance spaces 134 are provided opposite to each other on the other two sides of the rotating shaft 11. The protective plate 15 can be configured as an ellipse-like shape with straight sides and circular sides on the other two sides, or it can be directly configured as an ellipse, making the clearance space 134 area larger and more convenient for technicians to operate. The groove 151 can be provided near the clearance space 134, which can fully utilize the degree of freedom provided by the clearance space 134, further enhancing the deformation capability of the protective plate 15 and facilitating the assembly and disassembly of the protective plate 15.

[0050] The armature winding is wound on the body 135, which has a ventilation hole 137. The ventilation hole 137 is isolated from the receiving cavity 131 and is not connected to it, which ensures that the space where the encoder 20 is located is not affected by dust, moisture and other pollutants in the outside air. At the same time, the ventilation hole 137 and the clearance space 134 are connected to form a heat dissipation channel 138, which can effectively manage the heat dissipation of the stator support 13 and the armature winding, allowing heat to be directly discharged from the heat dissipation channel 138 without affecting the area where the environmentally sensitive encoder 20 is located.

[0051] Example 2:

[0052] like Figure 5As shown, in this embodiment, the rotating shaft 11 has a threaded hole 112, and the protective plate 15 has a mounting hole 152. The protective plate 15 and the rotating shaft 11 are connected by screws 30, which pass through the mounting hole 152 and are locked in the threaded hole 112. The pressure applied by the screws 30 can make the protective plate 15 fit tightly against the first stop step 133 of the stator bracket 13. The connection method using screws 30 is relatively simple and direct, and facilitates quick installation and disassembly.

[0053] Example 3:

[0054] like Figure 6 As shown, in this embodiment, the side wall of the rotating shaft 11 is provided with an external thread 113, and the encoder 20 is provided with an internal thread 201. The encoder 20 and the rotating shaft 11 are connected by the internal thread 201 and the external thread 113, without the need to add other parts, making the assembly process simpler and more direct.

[0055] Example 4:

[0056] like Figure 7 and Figure 8 As shown, in this embodiment, the encoder 20 and the shaft 11 are bonded together with adhesive. Adhesive bonding ensures a strong connection between the encoder 20 and the shaft 11 while reducing the need for additional parts, simplifying the internal structure design of the motor, saving space, and reducing overall weight, resulting in a more compact and efficient motor design. The side wall of the shaft 11 has a receiving groove 114, forming an adhesive cavity 40 between the receiving groove 114 and the inner wall of the encoder 20. When assembling the encoder 20 and the shaft 11, adhesive is filled into the receiving groove 114 before the encoder 20 is inserted to mate with the shaft 11. The adhesive cavity 40 formed by the receiving groove 114 and the inner wall of the encoder 20 ensures the adhesive bonding effect. The adhesive cavity 40 not only clearly defines the application location of the adhesive but also controls the specific amount of adhesive used, avoiding overflow due to excessive adhesive use and preventing insufficient adhesive from affecting the bonding effect.

[0057] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A brushless motor with an encoder, comprising a rotating shaft, a rotor housing connected to the rotating shaft, and a stator support located between the rotating shaft and the rotor housing, characterized in that, An encoder is fitted onto the rotating shaft, and the stator support has a cavity for accommodating the encoder. The rotating shaft has a first support step located in the cavity, and the stator support also has a protective plate that closes the cavity and presses the encoder onto the first support step.

2. A brushless motor with encoder according to claim 1, characterized in that, The inner wall of the receiving cavity is provided with a second supporting step surrounding the first supporting step. The inner ring of the encoder is supported on the first supporting step, and the outer ring of the encoder is supported on the second supporting step.

3. A brushless motor with encoder according to claim 1, characterized in that, The stator support is provided with a stop step. When the protective plate is installed, the protective plate is deformed under pressure and tightly locked in the stop step.

4. A brushless motor with encoder according to claim 3, characterized in that, The protective plate is provided with grooves that facilitate deformation.

5. A brushless motor with encoder according to claim 3, characterized in that, The stator support includes an outward protrusion and a body portion connected to the outward protrusion. The outward protrusion protrudes from the body portion along the axial direction of the rotating shaft to form a stop step between the outward protrusion and the body portion. Multiple outward protrusions are spaced apart along the circumferential direction of the rotating shaft, and a clearance space is formed between two outward protrusions to facilitate the disassembly of the protective plate.

6. A brushless motor with encoder according to claim 5, characterized in that, An armature winding is wound on the main body, and the main body is provided with ventilation holes. The ventilation holes are isolated from the receiving cavity and are not connected to each other. The ventilation holes are connected to the clearance space to form a heat dissipation channel.

7. A brushless motor with encoder according to claim 1, characterized in that, The rotating shaft is provided with a threaded hole, and the protective plate is provided with a mounting hole. The protective plate and the rotating shaft are connected by screws, with the screws passing through the mounting hole and locked in the threaded hole.

8. A brushless motor with encoder according to claim 1, characterized in that, The encoder and the shaft are bonded together with adhesive.

9. A brushless motor with encoder according to claim 8, characterized in that, The side wall of the rotating shaft is provided with a receiving groove, and a glue-filled cavity is formed between the receiving groove and the inner wall of the encoder.

10. A brushless motor with encoder according to claim 1, characterized in that, The side wall of the rotating shaft is provided with an external thread, and the encoder is provided with an internal thread. The encoder and the rotating shaft are connected by the internal and external threads.

Images