ｂ、轉子b， rotors轉子的結構也非常簡單，主體是鋼制桿件，一般外涂耐磨耐蝕的鉻合金材料。其作用是傳遞動力和寫定子形成密封腔。the structure of the rotor is also very ---， the main body is steel rod， generally coated with abrasion resistant&corrosion resistant chromium alloy material. its function is to transfer power&write the stator to form a seal cavity.ｃ、回轉筒c， rotary barrel回轉筒也就是一根內徑較大的油管或空心定子筒，接在定子的上部以給轉子和抽油桿桿柱以較大的回旋空間，防止轉子和抽油桿因偏心運動磨擦磨損油管。a rotary cylinder is also an oil tube/hollow stator barrel with larger inner diameter. it is connected to the upper part of the stator to provide larger swirl space for the rotor&---er rod string， so as to prevent the rotor&---er rod from attrition wear due to eccentric wear.
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