Protective structure of motor encoder

Abstract

The utility model provides a protection structure of a motor encoder, which comprises a motor casing, a motor rotor and an encoder, the motor rotor and the encoder are arranged on the motor casing, the motor rotor is rotatably arranged in the motor casing, a rotating shaft of the motor rotor backwards extends out of the rear end of the motor casing, and a fixing frame is fixed on the outer side of the rear end of the motor casing. A connecting shaft is rotatably arranged at the front end of the fixing frame, a stator of the encoder is fixed to the rear end of the fixing frame, a rotor of the encoder fixedly sleeves the rear end of the connecting shaft and synchronously rotates along with the connecting shaft, the connecting shaft is parallel to a rotating shaft of the motor rotor, and the front end of the connecting shaft is in transmission connection with the rotating shaft of the motor rotor through a conveying belt. The utility model has the advantages of simple structure and high reliability, and can effectively prevent the encoder from being impacted and damaged.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a protective structure for a motor encoder. Background Technology

[0002] Encoder structures are widely used in the control and detection of servo motors, playing a crucial role in detecting motor speed. Traditional encoder structures often employ a direct, rigid connection between the motor rotor shaft and the encoder, a design with certain drawbacks. Because the electronic rotor shaft is frequently subjected to impacts during operation, it can easily lead to inaccurate encoder data or damage, thus affecting the control accuracy and reliability of the servo motor and reducing the overall performance of the equipment. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the prior art and provide a protective structure for a motor encoder that is simple in structure, highly reliable, and can effectively prevent the encoder from being damaged by impact.

[0004] To address the aforementioned problems, this utility model provides a protective structure for a motor encoder, comprising a motor housing, a motor rotor, and an encoder mounted on the motor housing. The motor rotor is rotatably mounted inside the motor housing, with its rotational axis extending rearward beyond the rear end of the motor housing. A mounting bracket is fixed to the outer side of the rear end of the motor housing, and a connecting shaft is rotatably mounted at the front end of the mounting bracket. The stator of the encoder is fixed to the rear end of the mounting bracket, and the rotor of the encoder is fixedly sleeved on the rear end of the connecting shaft and rotates synchronously with the connecting shaft. The connecting shaft is parallel to the rotational axis of the motor rotor, and the front end of the connecting shaft is connected to the rotational axis of the motor rotor via a conveyor belt.

[0005] Compared with the prior art, the advantages of this utility model are as follows: This utility model constructs a non-rigid transmission system by setting a connecting shaft parallel to the motor rotor shaft and a conveyor belt transmission structure. The flexibility of the conveyor belt can effectively buffer the mechanical impact transmitted by the motor rotor shaft. The connecting shaft physically isolates the encoder rotor from the motor rotor shaft through an independent support structure. This design not only ensures the accurate transmission of speed signals, but also significantly reduces the axial vibration and radial sway impact on the encoder. Compared with the traditional rigid connection method, this protective structure mechanically decouples the encoder installation position from the vibration source of the motor body, improving the encoder's impact resistance while ensuring transmission accuracy.

[0006] As an improvement, a threaded hole is provided on the rear end face of the connecting shaft, corresponding to the position of the encoder rotor center hole. The connecting shaft and the encoder rotor are fixedly connected by a fixing bolt, which is inserted into the rotor center hole and threadedly connected to the threaded hole. A mounting hole is recessed forward on the rear end face of the mounting bracket, and the encoder stator is fixedly embedded in the mounting hole. This improvement achieves precise coaxial positioning of the encoder rotor and the connecting shaft through the mating structure of the threaded hole on the connecting shaft end face and the fixing bolt. The design of the fixing bolt passing through the encoder rotor center hole and the threaded hole ensures synchronous rotation of the rotor and the connecting shaft, and eliminates assembly gaps through bolt preload. The mounting hole at the rear end of the mounting bracket adopts an embedded structure to fix the encoder stator, forming a precise alignment reference between the stator and the rotor. This combined connection scheme effectively avoids relative displacement during high-speed operation, ensures the stability of encoder signal acquisition, and reduces the assembly process difficulty through standardized threaded connection.

[0007] As an improvement, a protective cover is detachably mounted at the rear end of the mounting bracket, with the encoder located inside the cover. In this structure, the added protective cover completely encloses the encoder, directly preventing external dust, oil, and other contaminants from entering the encoder's working area. The rigid connection between the cover and the mounting bracket ensures the overall strength of the protective structure while avoiding additional vibration sources. This protective structure significantly improves the encoder's environmental adaptability in harsh conditions such as humidity and dust without affecting its heat dissipation requirements, extending the service life of precision detection components. The detachable design facilitates quick opening and closing during regular maintenance, meeting the maintainability requirements of industrial sites. Attached Figure Description

[0008] Figure 1 This is a perspective view of the present utility model;

[0009] Figure 2 This is a top view of the present invention;

[0010] Figure 3 for Figure 2 A sectional view along line AA.

[0011] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0012] Explanation of reference numerals in the attached figures:

[0013] 1. Motor housing; 2. Motor rotor; 3. Encoder; 4. Mounting bracket; 40. Rotor center hole; 5. Connecting shaft; 50. Threaded hole; 6. Conveyor belt; 7. Fixing bolts; 8. Mounting hole; 9. Protective cover. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] like Figures 1 to 3 As shown, a protective structure for a motor encoder 3 includes a motor housing 1, a motor rotor 2 and an encoder 3 mounted on the motor housing 1. The motor rotor 2 is rotatably mounted inside the motor housing 1, and the rotating shaft of the motor rotor 2 extends rearward beyond the rear end of the motor housing 1. A fixing frame 4 is fixed to the outer side of the rear end of the motor housing 1, and a connecting shaft 5 is rotatably mounted at the front end of the fixing frame 4. The stator of the encoder 3 is fixed to the rear end of the fixing frame 4, and the rotor of the encoder 3 is fixedly sleeved on the rear end of the connecting shaft 5 and rotates synchronously with the connecting shaft 5. The connecting shaft 5 is parallel to the rotating shaft of the motor rotor 2, and the front end of the connecting shaft 5 is connected to the rotating shaft of the motor rotor 2 via a conveyor belt 6.

[0016] This invention constructs a non-rigid transmission system by setting a connecting shaft 5 parallel to the rotating shaft of the motor rotor 2 and a transmission structure of a conveyor belt 6. The flexibility of the conveyor belt 6 can effectively buffer the mechanical impact transmitted by the rotating shaft of the motor rotor 2. The connecting shaft 5 physically isolates the encoder rotor 3 from the rotating shaft of the motor rotor 2 through an independent support structure. This design not only ensures the accurate transmission of speed signals, but also significantly reduces the axial vibration and radial sway impact on the encoder 3. Compared with the traditional rigid connection method, this protective structure mechanically decouples the installation position of the encoder 3 from the vibration source of the motor body, thereby improving the impact resistance of the encoder 3 while ensuring transmission accuracy.

[0017] like Figure 3 and Figure 4 As shown, a threaded hole 50 is provided on the rear end face of the connecting shaft 5. The threaded hole 50 corresponds to the position of the rotor center hole 40 of the encoder 3. The connecting shaft 5 and the rotor of the encoder 3 are fixedly connected by a fixing bolt 7. The fixing bolt 7 is inserted into the rotor center hole 40 and threadedly connected to the threaded hole 50. A mounting hole 8 is recessed forward on the rear end face of the fixing bracket 4, and the stator of the encoder 3 is fixedly embedded in the mounting hole 8. This improvement achieves precise coaxial positioning of the encoder 3 rotor and the connecting shaft 5 through the mating structure of the threaded hole 50 on the end face of the connecting shaft 5 and the fixing bolt 7. The design of the fixing bolt 7 penetrating through the rotor center hole 40 and the threaded hole 50 of the encoder 3 ensures the synchronous rotation of the rotor and the connecting shaft 5, and eliminates assembly gaps through bolt preload. The mounting hole 8 at the rear end of the fixing bracket 4 adopts an embedded structure to fix the encoder 3 stator, forming a precise alignment reference between the stator and the rotor. This combined connection scheme effectively avoids relative displacement during high-speed operation, ensures the stability of the encoder 3 signal acquisition, and reduces the assembly process difficulty through standardized threaded connection.

[0018] like Figure 1 and Figure 4 As shown, a protective cover 9 is detachably fixed to the rear end of the mounting bracket 4, and the encoder 3 is located inside the protective cover 9. The protective cover 9 can be snapped onto the rear end of the mounting bracket 4. To achieve a more secure connection, the protective cover 9 is usually fixed to the rear end of the mounting bracket 4 with bolts. In this structure, the added protective cover 9 completely encloses the encoder 3, directly blocking external dust, oil, and other contaminants from entering the working area of ​​the encoder 3. The rigid connection design between the cover and the mounting bracket 4 ensures the overall strength of the protective structure and avoids the generation of additional vibration sources. This protective structure significantly improves the environmental adaptability of the encoder 3 in harsh working conditions such as humidity and dust without affecting the heat dissipation requirements of the encoder 3, and extends the service life of precision detection components. The detachable design facilitates quick opening and closing during regular maintenance, meeting the maintainability requirements of industrial sites.

[0019] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A protective structure for a motor encoder, comprising a motor housing (1) and a motor rotor (2) and an encoder (3) disposed on the motor housing (1), wherein the motor rotor (2) is rotatably disposed within the motor housing (1), characterized in that: The rotating shaft of the motor rotor (2) extends rearward beyond the rear end of the motor housing (1). A fixing frame (4) is fixed on the outer side of the rear end of the motor housing (1). A connecting shaft (5) is rotatably provided at the front end of the fixing frame (4). The stator of the encoder (3) is fixed at the rear end of the fixing frame (4). The rotor of the encoder (3) is fixedly sleeved on the rear end of the connecting shaft (5) and rotates synchronously with the connecting shaft (5). The connecting shaft (5) is arranged parallel to the rotating shaft of the motor rotor (2). The front end of the connecting shaft (5) is connected to the rotating shaft of the motor rotor (2) by a transmission belt (6).

2. The protective structure for the motor encoder according to claim 1, characterized in that: The connecting shaft (5) has a threaded hole (50) on its rear end face. The threaded hole (50) corresponds to the rotor center hole (40) of the encoder (3). The connecting shaft (5) and the rotor of the encoder (3) are fixedly connected by a fixing bolt (7). The fixing bolt (7) is inserted into the rotor center hole (40) and threadedly connected to the threaded hole (50). The mounting hole (8) is recessed forward on the rear end face of the fixing bracket (4). The stator of the encoder (3) is fixedly embedded in the mounting hole (8).

3. The protective structure for the motor encoder according to claim 2, characterized in that: The rear end of the mounting bracket (4) is detachably fixed with a protective cover (9), and the encoder (3) is located inside the protective cover (9).

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