Sähköinen turbokone ja energianmuunnin

摘要

A high-speed electrical turbo-machine for an Organic Rankine Cycle energy converter is presented. The electrical turbo-machine comprises a stator (101), a rotor (102) for interacting with the stator, and an impeller (103) at an end of the rotor, the impeller being suitable for operating as a turbine for rotating the rotor. The stator comprises a stator core (104) having stator teeth (111, 112) and a stator winding having stator coils (105, 108). The width of each stator coil is one stator slot pitch and each stator coil is arranged to surround only one of the stator teeth so as to minimize the length of the stator end-windings in the axial direction of the rotor. The short end-windings enable the rotor to be shorter, and thus the natural frequencies of the rotor are higher. As a corollary, the critical speeds that excite the natural frequencies of the rotor are higher too.