... .Bush bearing, 5. Pump shaft, 6. Inner magnet rotor, 7. External magnet rotor. 8. Bracket, 9. Electric motor, 10. Base.Operating ... the schematic drawing, an electric motor and an external magnetic rotor compose a drive unit, while an impeller and an inner magnetic ... force and pulling force between the external magnet rotor and inner magnet rotor, electric motor can drive the inner rotor, pump’s ...