SSI-Resolver Coaxial Dual Output Redundant Encoder

Abstract

This utility model discloses an SSI-resolver coaxial dual-output redundant encoder, including an encoder and a resolver, which are coaxially arranged. The encoder includes a support housing, and an output shaft is located at the center of the support housing. The resolver includes a stator and a rotor, with the rotor located at the center of the stator. This utility model relates to the field of encoder technology. This coaxial dual-output redundant encoder integrates the resolver and the SSI encoder module into the same shaft system and housing, achieving coaxial installation and integrated packaging. The overall structure is compact, lightweight, and small in size, which is beneficial for use in space-constrained equipment. The device simultaneously outputs digital position signals and analog sine and cosine signals, which can be used for redundancy comparison or fault switching in control systems, effectively improving the system's fault tolerance capability and avoiding synchronization inaccuracies caused by shaft deviation or installation errors in traditional split structures. The integrated design reduces wiring complexity and maintenance difficulty, and improves system deployment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of encoder technology, specifically to an SSI-resolver coaxial dual-output redundant encoder. Background Technology

[0002] In demanding applications such as modern industrial automation, robot control, motor servo systems, rail transportation, and wind power, the stability and reliability of position detection components directly affect the safety and operational efficiency of the entire system. Absolute encoders, especially those with Synchronous Serial Interface (SSI) output, are widely used in these fields due to their ability to provide high-resolution position data.

[0003] However, as an electronic device, SSI encoders are susceptible to electromagnetic interference (EMI), power fluctuations, and environmental vibrations during signal transmission, which can affect the accuracy of position information. Furthermore, some critical systems have high requirements for functional safety levels, necessitating sensors with redundant detection capabilities to meet international standards such as SIL (Safety Integrity Level) or PL (Performance Level).

[0004] A resolver is a simple, highly interference-resistant, high-temperature-resistant, and vibration-resistant rotation angle detection element widely used in motor feedback systems in harsh environments. Compared to digital encoders, resolvers use analog signal output, enabling stable operation even in environments with strong interference and exhibiting high environmental adaptability.

[0005] To further improve system reliability and safety, existing technologies have begun to explore incorporating multiple detection elements into the encoder structure to achieve mutual backup or signal verification. Especially in applications with high functional safety requirements or extreme operating environments, combining a rotary transformer with an SSI encoder has become a feasible and effective approach. This solution, by integrating a rotary transformer onto the SSI encoder shaft, enables dual detection of the same shaft angular position information, improving not only the system's accuracy and fault tolerance but also providing necessary hardware redundancy for high-safety-level systems.

[0006] However, the current stand-alone encoder + resolver solution mainly uses a digital encoder (such as an SSI interface absolute encoder) and a resolver as two independent sensors, mounted on the same rotating shaft or motor shaft. The output signals of each sensor are transmitted to the control system separately to achieve redundant detection and cross-verification of position signals. However, this method occupies a large space on the shaft end, which is not conducive to the layout design of miniaturized equipment or integrated modules. Furthermore, the two sensors have different mechanical mounting references, which may lead to synchronization errors, affecting the accuracy of redundant signal comparison. The wiring is complex, susceptible to interference, has poor long-term operational stability, and is difficult to maintain.

[0007] It is easy to see that most encoders and rotary transformers are still used as independent components, which are complex to install, occupy a lot of space, and have low system integration, which cannot meet the development needs of miniaturization and high integration applications. In view of this, in-depth research was conducted on the above problems, which led to this case. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention provides an SSI-resolver coaxial dual-output redundant encoder, which solves the existing background technology problems.

[0009] To achieve the above objectives, this utility model is implemented through the following technical solution: an SSI-resolver coaxial dual-output redundant encoder, including an encoder and a resolver, the encoder and the resolver being coaxially arranged, the encoder including a support housing, an output shaft being arranged at the center of the support housing, and the resolver including a stator and a rotor, the rotor being arranged at the center of the stator;

[0010] The rotor and the output shaft are rigidly connected by a fixing assembly;

[0011] At least two pairs of locating pins are evenly distributed on the support housing. The stator of the rotary transformer is fitted with a mounting flange. The mounting flange is provided with locating holes corresponding to the positions of the locating pins. The mounting flange is installed on the support housing. The head end of the locating pin is inserted into the locating hole. The locating hole is provided with a locating pin connected to the locating pin.

[0012] The fixing component includes a spline groove. The outer periphery of the encoder's output shaft is provided with a spline groove. The rotor of the rotary transformer is provided with a positioning spline. The rotor is sleeved on the encoder's output shaft, and the positioning spline and the spline groove form a radial limit. The rotor is provided with a fixing hole. The encoder's output shaft is provided with a threaded hole. A fixing bolt is embedded in the fixing hole and connected to the threaded hole.

[0013] Preferably, the mounting flange is a stepped reducing sleeve, and the head end of the positioning pin is provided with a mounting hole with an internal hexagonal structure.

[0014] Preferably, the positioning hole has an I-shaped cross-section, the bottom opening of the positioning hole matches the head end of the positioning pin, and the positioning pin has a pull-back hole for connection with the positioning pin.

[0015] Preferably, a connector is provided on one side of the support housing, and the connector is used for data transmission.

[0016] Preferably, the positioning spline is a rectangular plate, and the spline groove matches the positioning spline.

[0017] This invention provides an SSI-resolver coaxial dual-output redundant encoder. It offers the following advantages: This coaxial dual-output redundant encoder integrates the resolver and SSI encoder module within the same shaft system and housing, achieving coaxial mounting and integrated packaging. The overall structure is compact, lightweight, and small in size, making it suitable for use in space-constrained equipment. The device simultaneously outputs digital position signals and analog sine and cosine signals, which can be used for redundancy comparison or fault switching in control systems, effectively improving the system's fault tolerance. It avoids synchronization inaccuracies caused by shaft deviation or installation errors in traditional split structures. The integrated design reduces wiring complexity and maintenance difficulty, improving system deployment efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the encoder structure of the SSI-resolver coaxial dual-output redundant encoder described in this utility model.

[0019] Figure 2 This is a schematic diagram of the encoder structure of the SSI-resolver coaxial dual-output redundant encoder described in this utility model.

[0020] Figure 3 This is a schematic diagram of the encoder structure of the SSI-resolver coaxial dual-output redundant encoder described in this utility model.

[0021] In the diagram: 1. Encoder; 2. Rotary transformer; 3. Mounting flange; 11. Support housing; 12. Output shaft; 13. Locating pin; 14. Spline groove; 15. Terminal; 21. Stator; 22. Rotor; 23. Locating spline; 24. Fixing bolt; 31. Locating hole; 32. Locating pin. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides an implementation scheme: Currently, most encoders 1 and rotary transformers 2 are still used as independent components, occupying a large amount of shaft end space, which is not conducive to the layout design of miniaturized equipment or integrated modules. In addition, the two sensors have different mechanical mounting bases, which may lead to synchronization errors, affecting the accuracy of redundant signal comparison. The wiring is complex, susceptible to interference, has poor long-term operational stability, is difficult to maintain, and has low system integration, which cannot meet the development needs of miniaturized and highly integrated applications.

[0024] To solve the above-mentioned technical problems, this application discloses an SSI-resolver coaxial dual-output redundant encoder 1, including encoder 1 and resolver 2, encoder 1 and resolver 2 are coaxially arranged, encoder 1 includes a support housing 11, output shaft 12 is arranged at the center of support housing 11, resolver 2 includes stator 21 and rotor 22, rotor 22 is arranged at the center of stator 21, rotor 22 and output shaft 12 are rigidly connected by a fixing component to ensure that the two rotate synchronously without angular lag.

[0025] At least two pairs of locating pins 13 are evenly distributed on the support housing 11 to provide a reference for the precise centering of the stator 21 of the rotary transformer 2. The stator 21 of the rotary transformer 2 is fitted with a mounting flange 3. The mounting flange 3 is provided with locating holes 31 that correspond precisely to the positions of the locating pins 13. The mounting flange 3 is installed on the support housing 11. The head end of the locating pin 13 is inserted into the locating hole 31. The locating hole 31 is provided with a locating nail 32. The locating nail 32 is screwed in and connected to the locating pin 13, thus firmly fixing the mounting flange 3 to the support housing 11 and ensuring the concentricity of the stator 21 and the encoder 1 housing.

[0026] The fixing assembly includes a spline groove 14, which is provided on the outer periphery of the output shaft 12 of the encoder 1. A positioning spline 23 is provided on the rotor 22 of the rotary transformer 2. The rotor 22 is sleeved on the output shaft 12 of the encoder 1, and the positioning spline 23 meshes with the spline groove 14 to form a precise radial limit, preventing the rotor 22 from circumferentially sliding or radially offset on the output shaft 12. A fixing hole is provided on the rotor 22, and a threaded hole is provided at a corresponding position on the output shaft 12 of the encoder 1. A fixing bolt 24 is embedded in the fixing hole, and the fixing bolt 24 is screwed into the threaded hole, rigidly and immovably locking the rotor 22 and the output shaft 12 together in the axial and rotational directions.

[0027] As a preferred option, the mounting flange 3 is a stepped reducing sleeve, providing a stable mounting support surface. The positioning hole 31 is set on the outer ring for easy alignment and operation. The head end of the positioning pin 32 is provided with an internal hexagonal mounting hole, which facilitates installation and disassembly using a standard internal hexagonal wrench, ensuring a tight and reliable connection.

[0028] As a preferred option, the positioning hole 31 has an I-shaped cross-section. The size of the bottom opening of the positioning hole 31 is precisely matched with the head of the positioning pin 13, providing good positioning guidance. The positioning pin 13 is provided with a pull-back hole, and the end of the positioning nail 32 is screwed into this pull-back hole for connection. This "I-shaped hole + pull-back nail" structure can generate an inward pulling force when tightened, so that the mounting flange 3 fits more tightly on the support housing 11, effectively improving the connection rigidity and vibration resistance, and preventing loosening after long-term operation.

[0029] As a preferred embodiment, a connector 15 is provided on one side of the support housing 11, the connector 15 being used for data transmission.

[0030] As a preferred option, the positioning spline 23 is a rectangular plate, and the spline groove 14 matches the positioning spline 23. The rectangular spline design has self-centering and alignment capabilities, which can automatically guide the rotor 22 to be precisely aligned with the output shaft 12 during meshing, while providing a larger contact area and load-bearing capacity, ensuring reliable radial limiting and power transmission under high torque or impact loads.

[0031] Workflow: First, assemble the rotary transformer 2 and encoder 1 together. Specifically, align the rotor 22 of the rotary transformer 2 with the spline groove 14 on the output shaft 12 of the encoder 1 via its positioning spline 23 to achieve initial radial positioning. Then, use fixing bolts 24 to pass through the fixing holes on the rotor 22 and screw them into the threaded holes on the output shaft 12 to rigidly lock the rotor 22 and the output shaft 12. Next, place the mounting flange 3 on the outside of the stator 21 of the rotary transformer 2, align the positioning holes 31 on the mounting flange 3 with the positioning pins 13 on the support housing 11, and insert them. Finally, use... Positioning pin 32 is screwed into the pull hole of positioning pin 13 to tighten and fix mounting flange 3 on support housing 11, while ensuring precise coaxiality between stator 21 and encoder housing 1. During operation, the rotating shaft of the equipment drives the output shaft 12 of encoder 1 to rotate, and drives the rotor 22 of rotary transformer 2 to rotate synchronously through rigid connection fixing components. Encoder 1 outputs SSI signal, and rotary transformer 2 outputs analog sine signal. After RDC conversion, absolute position can be obtained. It works simultaneously, providing two independent and coaxial rotation position measurement information to achieve highly reliable redundant output.

[0032] This coaxial dual-output redundant encoder 1 integrates the rotary transformer 2 and the SSI encoder 1 module into the same shaft system and housing, achieving coaxial mounting and integrated packaging. The overall structure is compact, lightweight, and small in size, which is beneficial for use in space-constrained equipment. The device simultaneously outputs digital position signals and analog sine and cosine signals, which can be used for redundancy comparison or fault switching in control systems, effectively improving the system's fault tolerance and avoiding synchronization inaccuracies caused by shaft deviation or installation errors in traditional split structures. The integrated design reduces wiring complexity and maintenance difficulty, and improves system deployment efficiency.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An SSI-resolver coaxial dual-output redundant encoder (1), comprising an encoder (1) and a resolver (2), wherein the encoder (1) and the resolver (2) are coaxially arranged, characterized in that, The encoder (1) includes a support housing (11), and an output shaft (12) is disposed at the center of the support housing (11). The rotary transformer (2) includes a stator (21) and a rotor (22), and the rotor (22) is disposed at the center of the stator (21). The rotor (22) is rigidly connected to the output shaft (12) by a fixing assembly; At least two pairs of positioning pins (13) are evenly distributed on the support housing (11). The stator (21) of the rotary transformer (2) is fitted with a mounting flange (3). The mounting flange (3) is provided with positioning holes (31) corresponding to the positions of the positioning pins (13). The mounting flange (3) is installed on the support housing (11). The head end of the positioning pin (13) is inserted into the positioning hole (31). The positioning hole (31) is provided with positioning nails (32) connected to the positioning pins (13). The fixing component includes a spline groove (14). The outer periphery of the output shaft (12) of the encoder (1) is provided with a spline groove (14). The rotor (22) of the rotary transformer (2) is provided with a positioning spline (23). The rotor (22) is sleeved on the output shaft (12) of the encoder (1), and the positioning spline (23) and the spline groove (14) form a radial limit. The rotor (22) is provided with a fixing hole. The output shaft (12) of the encoder (1) is provided with a threaded hole. The fixing hole is fitted with a fixing bolt (24) and connected to the threaded hole.

2. The SSI-rotating variable coaxial dual output redundant encoder (1) according to claim 1, characterized in that, The mounting flange (3) is a stepped reducing sleeve, and the head end of the positioning pin (32) is provided with an internal hexagonal mounting hole.

3. The SSI-rotary variable coaxial dual output redundant encoder (1) according to claim 2, characterized in that, The positioning hole (31) has an I-shaped cross-section. The bottom opening of the positioning hole (31) matches the head end of the positioning pin (13). The positioning pin (13) has a pull-back hole that connects to the positioning nail (32).

4. The SSI-rotary variable coaxial dual output redundant encoder (1) according to claim 3, characterized in that, A connector (15) is provided on one side of the support housing (11), and the connector (15) is used to transmit data.

5. The SS I-rotating variable coaxial dual-output redundant encoder (1) according to claim 4, characterized in that, The positioning spline (23) is a rectangular plate, and the spline groove (14) matches the positioning spline (23).

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