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摘要

The pump unit has an asynchronous motor (1) whose rotor (10) is formed of a packet of metal sheets through which a short circuit rod (14) made of copper or copper alloy passes. The rotor runs in a split tube (9) which seals the pump chamber relative to the stator (11). The split tube is made of ferrite stainless steel and the short circuit rod is molded into the metal sheet packet.