Brushless DC submersible motor rotor structure

Abstract

The invention discloses a brushless direct-current submersible motor rotor structure which comprises a non-magnetic-conductivity rotor shaft, a rotor and magnetic shoes. Wedge strip grooves are evenly distributed in the outer circumferential surface of the rotor, non-magnetic-conductivity wedge strips evenly protruding out of the outer circumferential surface of the rotor are embedded into the wedge strip grooves, the magnetic shoes are evenly and circumferentially laid on the outer circumferential surface of the rotor, the magnetic polarity of the adjacent magnetic shoes is opposite, the adjacent magnetic shoes are isolated through the non-magnetic-conductivity wedge strips, the height of the portions, protruding out of the outer circumferential surface of the rotor, of the non-magnetic-conductivity wedge strips is not larger than the thickness of the magnetic shoes, the two ends of the rotor are further sleeved with a pair of cylindrical non-magnetic-conductivity rotor outer sleeves respectively, the single ends of the rotor outer sleeves are sealed, central shaft holes are formed in the sealed end faces of the rotor outer sleeves, the end portion of the rotor, the magnetic shoes and the non-magnetic-conductivity wedge strips are wrapped and embedded through the non-magnetic-conductivity rotor shaft, the two end faces of the rotor are made to reach the sealed end faces of the non-magnetic-conductivity rotor outer sleeves respectively, and the inlet ends of the non-magnetic-conductivity rotor outer sleeves at the two ends abut against each other. The brushless direct-current submersible motor rotor structure has the advantages of being simple in structure, simple in production process and high in efficiency, ensuring precision, and being low in cost and capable of preventing the magnetic shoes from falling off and preventing rust better.

Description

technical field [0001] The invention relates to a rotor structure of a brushless DC submersible motor. Background technique [0002] In the prior art, the rotor structure of the brushless DC submersible motor mainly includes the non-magnetic rotor shaft, the rotor and the magnetic tiles installed in the rotor. Due to the working environment of the submersible motor, there are requirements for the magnetic tiles to prevent falling off and rust. The best method is to set evenly distributed magnetic tile slots on the outer circumference of the rotor. Some of the magnetic tile slots are opened in the shape of dovetail slots. To prevent the tile from falling off and rust, after the magnetic tile is installed on the rotor, a non-magnetic sleeve is placed on the outer surface of the rotor, wrapped together with the magnetic tile, and then resin is encapsulated at both ends of the rotor to seal the magnetic tile. Although this structure can prevent the magnetic tiles from falling o...

AI Technical Summary

Problems solved by technology

Although this structure can prevent the magnetic tiles from falling off and prevent rust, there are many shortcomings. First, the machining accuracy of the rotor is problematic. Since the rotor of the submersible motor, especially the submersible motor for wells, is slender, in order to prevent the rotor from contacting and rubbing against the inner cavity of the stator , and to ensure that the dynamic balance of the rotor meets the requirements, the rotor surface has high requirements for beating and concentricity, and there are wide notches on the outer circumferential surface of the rotor with the above structure, and it is difficult to process the rotor surface and the groove bottom of the magnetic tile slot, because when fine When the thickness of the laminations of the long rotor is large or when a single lamination is used, it is easy to produce lamination misalignment errors on the notch and the rotor surface, as well as errors in the circumferential runout and concentricity, which require processing and correction, and the cost increases. If not processed, the magnetic There may be different tightness when the tile is inserted, and it may even be difficult to install or it is easy to cause the magnetic tile to crack when the rotor is running hot. The error will cause greater errors in the surface beating and concentricity of the finished rotor, and the rotor is more likely to produce unbalanced vibrations. The magnetic sleeve needs to take more wall thickness as the machining allowance, which wastes material

Secondly, the process of wrapping the rotor with a non-magnetic sleeve is complicated, requiring thin-walled, seamed or seamless tubes. When the rotor is slender, the insertion length is large, which is difficult. At the same time, it takes a long time to encapsulate the resin at both ends, which not only affects production efficiency , and make the rotor production cost higher, which is not conducive to product competition; thirdly, in order to prevent the magnetic tile from loosening in the slot, the requirements for the accuracy of the magnetic tile shape and size are high, which makes the magnetic tile production cost high, which is also not conducive to product competition

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