Permanent magnet submersible motor rotating shaft mutation mechanism

Abstract

The utility model belongs to submersible motor technical field especially relates to permanent magnet submersible motor rotating shaft mutation mechanism for realizing diameter big transition between motor output shaft and rotary variable driven shaft, including motor output shaft assembly section, mutation axle section and rotary variable driven shaft assembly section of size gradually reducing, motor output shaft assembly section, mutation axle section and rotary variable driven shaft assembly section concentricity are established, the assembly end of motor output shaft assembly section is provided with assembly groove no. 1, and assembly groove no. 1 is assembled with motor output shaft, the assembly end of rotary variable driven shaft assembly section is provided with assembly groove no. 2, and assembly groove no. 2 is assembled with rotary variable driven shaft, the inner diameter of assembly groove no. 1 is greater than the inner diameter of assembly groove no. 2, and both coaxial settings. Permanent magnet submersible motor rotating shaft mutation mechanism in the application, the setting of motor output shaft assembly section is used to realize the assembly of motor output shaft, the setting of rotary variable driven shaft assembly section is used to realize the assembly of rotary variable driven shaft, and the mutation axle section connects motor output shaft assembly section and rotary variable driven shaft assembly section, effectively bears the main load of shafting, guarantees the structural stability of rotating shaft in the process of big torque transmission.

Description

Technical Field

[0001] This utility model belongs to the field of submersible motor technology, and in particular relates to a permanent magnet submersible motor shaft change mechanism. Background Technology

[0002] To achieve the comprehensive goals of "smooth operation, precise control, and functional safety," a motor must continuously and reliably acquire the absolute position of the rotor magnetic poles across the entire temperature range (-55℃ to +155℃), the entire speed range (0 r / min to the maximum operating speed), and under all electromagnetic interference conditions. In permanent magnet submersible motors, the rotary transformer, based on the principle of all-metal electromagnetic induction, outputs analog quadrature signals and possesses characteristics such as high shock resistance, high temperature resistance, and high resistance to electromagnetic disturbances. It is used to provide absolute position feedback for the rotor magnetic poles and is a key sensor in the vector control system.

[0003] Since the output shaft of a submersible motor is usually a large-diameter solid structure to meet torque and sealing requirements, while the driven shaft of a resolver is a small-diameter shaft, there is a significant difference in shaft diameter between the two. Existing technologies often use transition sleeves or couplings to achieve the transition, which often results in severe stress concentration at the abrupt change in diameter, difficulty in ensuring coaxiality, and poor assembly stability. This leads to easy fatigue failure of the shaft, high vibration and noise during motor operation, and low resolver detection accuracy, which in turn affects the overall performance and service life of the permanent magnet submersible motor. These problems are even more prominent under complex underwater working conditions.

[0004] To address the aforementioned issues, a permanent magnet submersible motor shaft abrupt change mechanism was designed. Utility Model Content

[0005] This utility model addresses the problems in the prior art by proposing the following technical solution: A permanent magnet submersible motor shaft transition mechanism is used to achieve a large diameter transition between the motor output shaft and the resolver driven shaft. It includes a motor output shaft assembly section, a transition shaft section, and a resolver driven shaft assembly section with successively decreasing dimensions. The motor output shaft assembly section, the transition shaft section, and the resolver driven shaft assembly section are concentrically arranged. The motor output shaft assembly section has an assembly groove 1 at its assembly end, which is assembled with the motor output shaft. The resolver driven shaft assembly section has an assembly groove 2 at its assembly end, which is assembled with the resolver driven shaft. The inner diameter of the assembly groove 1 is larger than the inner diameter of the assembly groove 2, and the two are coaxially arranged.

[0006] As a preferred embodiment of the above technical solution, the inner wall of the second assembly groove is provided with axially distributed limiting grooves.

[0007] As a preferred embodiment of the above technical solution, the connection end between the abrupt change shaft section and the motor output shaft assembly section is connected by a transition section one, and the connection end between the abrupt change shaft section and the resolver driven shaft assembly section is connected by a transition section two.

[0008] As a preferred embodiment of the above technical solution, the connection end between the transition section one and the motor output shaft assembly section is provided with an arc-shaped transition part one extending radially outward, and the dimension of the arc-shaped transition part one near the motor output shaft assembly section is larger than the dimension near the abrupt shaft section.

[0009] As a preferred embodiment of the above technical solution, the connection end between the second transition section and the abrupt change shaft section is provided with a radially outwardly extending arc-shaped transition portion two, the dimension of the arc-shaped transition portion two near the abrupt change shaft section is larger than the dimension near the resolver driven shaft assembly section.

[0010] The beneficial effects of this utility model are as follows: The permanent magnet submersible motor shaft abrupt change mechanism in this application includes a motor output shaft assembly section for assembling the motor output shaft and a resolver driven shaft assembly section for assembling the resolver driven shaft. The abrupt change shaft section connects the motor output shaft assembly section and the resolver driven shaft assembly section, effectively bearing the main load of the shaft system and ensuring the structural stability of the shaft during high torque transmission.

[0011] This application achieves a precise transition in diameter between the motor output shaft (large diameter) and the resolver driven shaft (small diameter) through a concentric design of the motor output shaft assembly section, the transition shaft section, and the resolver driven shaft assembly section, which are successively smaller in size. This solves the problem of reliable connection between shaft systems of different diameters. By assembling the motor output shaft and the resolver driven shaft in the coaxially arranged assembly slots one and two respectively, the motor output shaft and the resolver driven shaft are coaxially engaged to achieve synchronous rotation, ensuring the coaxial accuracy of the shaft transmission, reducing vibration and noise during operation, improving transmission efficiency, and reducing the risk of component wear due to coaxiality deviation. Attached Figure Description

[0012] Figure 1 The diagram shown is a structural schematic of the permanent magnet submersible motor shaft abrupt change mechanism in Embodiment 1; Figure 2 What is shown is Figure 1 A schematic diagram of a local structure.

[0013] Reference numerals: Motor output shaft assembly section 10; Assembly slot 11; Abrupt transition section 20; Transition section one 21; Transition section two 22; Arc-shaped transition section one 23; Arc-shaped transition section two 24; Assembly section 30 for the driven shaft of the resolver; Assembly groove 2 31; Limiting groove 32. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0015] Example 1 like Figure 1 , Figure 2 As shown, the permanent magnet submersible motor shaft abrupt change mechanism is used to realize a large diameter transition between the motor output shaft and the resolver driven shaft. It includes a motor output shaft assembly section 10, an abrupt change shaft section 20, and a resolver driven shaft assembly section 30 with successively decreasing dimensions. In this embodiment, the diameter ratio of the motor output shaft assembly section 10, the abrupt change shaft section 20, and the resolver driven shaft assembly section 30 is 70:30:12, and the motor output shaft assembly section 10, the abrupt change shaft section 20, and the resolver driven shaft assembly section 30 are concentrically arranged. The motor output shaft assembly section 10 has an assembly groove 11 at its assembly end, which is assembled with the motor output shaft. The resolver driven shaft assembly section 30 has an assembly groove 31 at its assembly end, which is assembled with the resolver driven shaft. The inner diameter of the assembly groove 11 is larger than the inner diameter of the assembly groove 31, and the two are coaxially arranged.

[0016] The permanent magnet submersible motor shaft abrupt change mechanism of this application is provided with a motor output shaft assembly section 10, an abrupt change shaft section 20 and a resolver driven shaft assembly section 30, which are concentric and whose dimensions decrease sequentially. The motor output shaft and the resolver driven shaft are respectively assembled in the coaxially arranged assembly slot 11 and assembly slot 31. During operation, the torque of the motor output shaft is transmitted to the resolver driven shaft assembly section 30 through the motor output shaft assembly section 10 and the abrupt change shaft section 20, which ultimately drives the resolver driven shaft to rotate synchronously. The resolver can accurately detect its position and speed, thereby realizing precise control of the motor.

[0017] The permanent magnet submersible motor shaft abrupt change mechanism in this application includes a motor output shaft assembly section 10 for assembling the motor output shaft, a resolver driven shaft assembly section 30 for assembling the resolver driven shaft, and an abrupt change shaft section 20 connecting the motor output shaft assembly section 10 and the resolver driven shaft assembly section 30. This effectively bears the main load of the shaft system and ensures the structural stability of the shaft during high torque transmission.

[0018] This application achieves a precise transition in diameter between the motor output shaft (large diameter) and the resolver driven shaft (small diameter) through a concentric design of the motor output shaft assembly section 10, the transition shaft section 20, and the resolver driven shaft assembly section 30, which are successively smaller in size. This solves the problem of reliable connection between shaft systems of different diameters. By assembling the motor output shaft and the resolver driven shaft in the coaxially arranged assembly slots 11 and 31 respectively, the motor output shaft and the resolver driven shaft are coaxially coupled to form synchronous rotation, ensuring the coaxial accuracy of the shaft transmission, reducing vibration and noise during operation, improving transmission efficiency, and reducing the risk of component wear due to coaxiality deviation.

[0019] like Figure 1 As shown, an axially distributed limiting groove 32 is provided on the inner wall of the assembly groove 2 31. A limiting block matching the limiting groove 32 is provided on the resolver driven shaft. The matching arrangement of the limiting block and the limiting groove 32 limits the resolver driven shaft in the circumferential direction after it is assembled inside the assembly groove 2 31, preventing positional deviation during operation and ensuring long-term reliability of the connection.

[0020] like Figure 1 , Figure 2 As shown, the connection end between the abrupt change shaft section 20 and the motor output shaft assembly section 10 is connected by a transition section 1 21, and the connection end between the abrupt change shaft section 20 and the resolver driven shaft assembly section 30 is connected by a transition section 22. The connection end between the transition section 1 21 and the motor output shaft assembly section 10 is provided with a radially outwardly extending arc-shaped transition portion 23, the dimension of the arc-shaped transition portion 23 near the motor output shaft assembly section 10 is larger than the dimension near the abrupt change shaft section 20. The connection end between the transition section 22 and the abrupt change shaft section 20 is provided with a radially outwardly extending arc-shaped transition portion 24, the dimension of the arc-shaped transition portion 24 near the abrupt change shaft section 20 is larger than the dimension near the resolver driven shaft assembly section 30.

[0021] In this application, the dimension of the arc-shaped transition section 1 23 near the motor output shaft assembly section 10 is larger than the dimension near the abrupt change shaft section 20, and the dimension of the arc-shaped transition section 24 near the abrupt change shaft section 20 is larger than the dimension near the resolver driven shaft assembly section 30. That is, the arc-shaped transition design from the large diameter area to the small diameter area effectively eliminates stress concentration at the diameter abrupt change. When the motor is running, the bearing is subjected to a combined load of torque and bending moment. The arc-shaped transition can evenly distribute the stress, significantly improve the fatigue strength and failure resistance of the bearing, and extend its service life under complex underwater working conditions.

[0022] This application reduces the risk of water leakage and component loosening due to structural failure by using a stress-optimized shaft abrupt change mechanism and a reliable shaft connection design, thereby improving the working stability and environmental adaptability of the motor in complex underwater environments; and meets the extremely high requirements for structural sealing, corrosion resistance and reliability of permanent magnet submersible motors when operating in underwater environments.

[0023] This application, through the design of coaxial assembly slots and stable connection structures, effectively ensures the operating accuracy of the resolver driven shaft, thereby improving the detection accuracy of the resolver and ultimately optimizing the speed regulation, positioning, and other control performance of the permanent magnet submersible motor, enhancing the motor's dynamic response and control stability; it also addresses the issue that the detection accuracy of the resolver, used to provide absolute position feedback of the rotor magnetic poles, is highly dependent on the coaxiality of the shaft system.

[0024] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A permanent magnet submersible motor shaft transition mechanism, used to achieve a large diameter transition between the motor output shaft and the resolver driven shaft, characterized in that, It includes a motor output shaft assembly section (10), a sudden change shaft section (20), and a resolver driven shaft assembly section (30) with successively decreasing dimensions, and the motor output shaft assembly section (10), the sudden change shaft section (20), and the resolver driven shaft assembly section (30) are arranged concentrically; The motor output shaft assembly section (10) has an assembly groove 1 (11) at its assembly end, which is assembled with the motor output shaft. The resolver driven shaft assembly section (30) has an assembly groove 2 (31) at its assembly end, which is assembled with the resolver driven shaft. The inner diameter of the assembly groove 1 (11) is larger than the inner diameter of the assembly groove 2 (31), and the two are coaxially arranged.

2. The permanent magnet submersible motor shaft change mechanism according to claim 1, characterized in that, The inner wall of the assembly groove 2 (31) is provided with axially distributed limiting grooves (32).

3. The permanent magnet submersible motor shaft change mechanism according to claim 1, characterized in that, The connection between the abrupt change shaft section (20) and the motor output shaft assembly section (10) is connected by a transition section one (21), and the connection between the abrupt change shaft section (20) and the resolver driven shaft assembly section (30) is connected by a transition section two (22).

4. The permanent magnet submersible motor shaft abrupt change mechanism according to claim 3, characterized in that, The connection end between the transition section 1 (21) and the motor output shaft assembly section (10) is provided with an arc-shaped transition part 1 (23) extending radially outward. The size of the arc-shaped transition part 1 (23) on the side closer to the motor output shaft assembly section (10) is larger than the size on the side closer to the sudden change shaft section (20).

5. The permanent magnet submersible motor shaft abrupt change mechanism according to claim 3, characterized in that, The connection end between the second transition section (22) and the sudden change shaft section (20) is provided with a radially outwardly extending arc-shaped transition part (24), the size of the arc-shaped transition part (24) on the side near the sudden change shaft section (20) is larger than the size on the side near the resolver driven shaft assembly section (30).

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