本发明系关于一种同步发电机及一种用于一风力发电场(100)之一同步发电机之一转子之极组件(10)。该极组件(10)具有复数个极组件叠片(22)，其中每一极组件叠片(22)包括一极柄区域(20)及一极头区域(18)。该极头区域(18)横向突出超过该极柄区域(20)，且具有面向该极柄区域(20)之一侧(32)及背离该极柄区域(20)之一侧(30)。该极头区域(18)之轮廓至少在背离该极柄区域(20)之彼侧(30)上为椭球形。

The invention relates to a synchronous generator and also to a pole pack (10) for a rotor of a synchronous generator of a wind power plant (100). The pole pack (10) has a plurality of pole pack laminations (22), wherein each pole pack lamination (22) comprises a pole shank region (20) and a pole head region (18). The pole head region (18) projects laterally beyond the pole shank region (20) and has a side (32) which faces the pole shank region (20) and a side (30) which is averted from the pole shank region (20). The contour of the pole head region (18) is ellipsoidal at least on that side (30) which is averted from the pole shank region (20).