| 摘要 |
An electronically commutated external-rotor motor has an internal stator (20), having a stator lamination stack (64) and a winding arrangement (66) associated therewith. the latter, as well as a central opening (149) of the stator lamination stack (64), in which opening a bearing tube (56) is arranged. The motor further has a permanent-magnet external rotor (26) separated from the stator lamination stack (64) by a magnetically effective air gap (99), which rotor has a shaft (42) that is journalled in the bearing tube (56). First and second rolling bearings (48, 50) are arranged at a distance from one another in the bearing tube (56). The first rolling bearing (48), adjacent the rotor hub, is a floating bearing, while the second rolling bearing (50), near the shaft end (70) remote from the hub (40), is braced with one side against a shoulder (82) provided in the bearing tube (56). A compression spring (78) urges the two bearings toward one another, so that they serve as both an axial bearing and a radial bearing for the motor, thereby providing improved durability and longer service life. |
