| 摘要 |
Liquid diverted at the pump rotor periphery flows (FL) in the gap (18) between the motor rotor and an enclosing metal shell (6) preventing stator corrosion, returning to the intake (2) via an axial rotor channel (44). Two annular rotor grooves (45,46) promote this cooling flow. Metal or ceramic coatings prevent rotor corrosion. The main casing (5), containing the asynchronous motor's stator core (111) and windings (113), supports the pump whose rotor (1) is directly mounted on the motor's e.g. squirrel-cage rotor (4), running in magnetic bearings (7,8), with magnetic thrust bearings (9,10) at each end. The radial magnets, on U cores, are inherently position-detecting; separate position sensors (12) control axial positioning. Opt., single sets of conical bearings replace both radial and axial bearings. Emergency mechanical bearings (13,14) are provided, should magnetic system fail. External terminal boxes (16,17) meet applicable flameproof regulations. The protective shell (6), of e.g. stainless steel, is in contact with - opt. welded to - stator and bearing iron cores.
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