| 摘要 |
<p>A motor structure resistant to liquid intrusion features two modules, the first having an electronically commutated external-rotor motor ( 20 ), which motor comprises an internal stator ( 22 ) that is arranged on a bearing tube ( 30 ) and is separated by a first air gap ( 24 ) from an external rotor ( 26; 92 ), which latter comprises a rotor cup ( 40 ) that is open at one end and is joined at its other end to a shaft ( 46 ) that is journalled in the bearing tube ( 30 ), further having a permanent-magnet arrangement ( 76 ), arranged at the open end of the rotor cup ( 40 ), for magnetic interaction with a second permanent-magnet rotor ( 92 ), forming part of the second module. The first module is separated from that second rotor ( 92 ) by a second air gap and forms therewith a magnetic coupling ( 94 ), so that a rotation of the permanent-magnet arrangement ( 76 ) brings about a rotation of that second rotor ( 92 ). A hermetic separation of the two modules is accomplished using a non-ferromagnetic separating element ( 82 ) arranged in the second air gap. The second module can safely be used to handle liquid, e.g. as a pump.</p> |
