Aluminum strip rotor structure of low-temperature immersed motor
By using a rotor core composed of multiple silicon steel sheets, the rotor end plate and the iron core are superimposed, the guide strips and the guide strips fit, the rotor end ring grooves give way to the guide strips and press them flatly with the end plate, and the squirrel cage rotor is formed through welding, the problems of traditional aluminum bar rotors in the low-temperature submersible motor, etc., the conductor strips and pores inside the end ring in the low-temperature submersible motor are solved, and high-quality rotor manufacturing is achieved, meeting the requirements of low-temperature operation.
Patent Information
- Application Number
- CN202311196339.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-09
- Publication Date
- 2025-03-11
AI Technical Summary
The aluminum strip rotors manufactured by traditional die-casting process are prone to problems such as conductor strips and pores inside the end ring in low-temperature submersible motors, resulting in unqualified PT inspection and large initial unbalance measurement, resulting in high defect rate.
The structure consisting of a rotor core, a rotor end plate, a guide bar, a rotor end ring and an aluminum alloy solder is adopted. The rotor core composed of multiple silicon steel sheets, the rotor end plate and the iron core are superimposed and processed, the guide bar fits the guide bar, the rotor end ring is slotted and given way to the guide bar and presses the guide bar flat with the end plate, and a squirrel cage rotor is formed by welding.
The length deviation of the iron core and the internal defects of the cast aluminum process are eliminated, and the requirements for the rotor operation of the low-temperature submersible motor are met, the PT inspection pass rate and initial balance are improved, and the defective yield rate is reduced.
Smart Images
Figure CN119602557A_ABST
Abstract
Description
Technical Field
[0001] The technical field involved in this patent is: an aluminum bar rotor structure used in low-temperature submersible motors, specifically a squirrel cage rotor used under conditions of direct contact with the low-temperature medium LNG at -165℃. Background Art
[0002] In the LNG field, cryogenic submersible pumps are widely used. The motors of these pumps are directly immersed in the -165℃ low-temperature medium LNG. Due to the low temperature and easy gasification characteristics of the LNG medium, the working conditions are harsh and the quality requirements for rotor components are high, mainly the rotor surface must be smooth, there must be no fan blade balance column, the rotor surface must be inspected by PT, and the initial imbalance of the rotor must be small.
[0003] The cast aluminum rotors manufactured by traditional die-casting process do not fully remove the air in the cavity during die-casting, and problems such as air holes in the rotor bars and end rings often occur, resulting in failure of the PT test. The large initial imbalance of the rotor affects the subsequent dynamic balancing end ring deweighting, resulting in a high defective rate of cast aluminum rotors. Summary of the invention
[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: the rotor is composed of a rotor core (1), a rotor end plate (2), a guide bar (3), a rotor end ring (4), and an aluminum alloy solder (5); the rotor core is composed of a plurality of 0.5 mm silicon steel sheets, the rotor end plates are placed at both ends of the rotor core, the rotor end plates and the rotor core are laminated together and then processed to eliminate the core length deviation caused by the thickness difference of the silicon steel sheets; the processed stop is used to support the rotor end ring to eliminate the eccentricity of the rotor end ring; the rotor core and the rotor end plate are circumferentially evenly distributed with guide bar grooves that penetrate the rotor core and the rotor end plate, and the guide bars fit into the guide bar grooves; the rotor end ring is slotted to make way for the guide bars and is pressed against the end plate; radial welding ring grooves are machined to form a squirrel cage rotor through welding.
[0005] The technical solution provided by the present invention eliminates the core length deviation and the internal defects of the aluminum casting process, and meets the operation requirements of the low-temperature submersible motor rotor.
[0006] Figure 1 Schematic diagram of the aluminum bar rotor structure.
[0007] In the figure: 1. rotor core, 2. rotor end plate, 3. guide bar, 4. rotor end ring, 5. aluminum alloy solder.
Claims
1. A low-temperature submersible motor aluminum bar rotor structure, mainly composed of a rotor core, a rotor end plate, a guide bar, a rotor end ring, and an aluminum alloy solder; its main features are: The rotor core is composed of multiple 0.5mm silicon steel sheets. The rotor end plates are placed at both ends of the rotor core. The rotor end plates and the rotor core are laminated together and then processed to eliminate the core length deviation caused by the thickness difference of the silicon steel sheets; the processed stoppers are used to support the rotor end rings and eliminate the eccentricity of the rotor end rings; the rotor core and the rotor end plates have guide bar grooves that are evenly distributed around the circumference, and the guide bars fit into the guide bar grooves; the rotor end rings are slotted to make way for the guide bars and are pressed against the end plates; radial weld ring grooves are machined to form a squirrel cage rotor through welding.