| 摘要 |
The invention relates to an electric machine (1), which has a rotor (3), a stator (5), and a rotational-speed sensor (35). The rotor (3) comprises a hollow shaft (15). A pipe (19) is attached to the rotor in such a way that the pipe rotates together with the rotor, which pipe protrudes into an interior (17) of the hollow shaft (15) such that a a cooling fluid can flow through the pipe (19) into the interior (17). A rotational-speed sensor (35) is attached to a region (33) of the pipe (19) that protrudes beyond the hollow shaft (15). In the case of the proposed electric machine (1), which can be designed, for example, as an asynchronous machine, heat arising in the rotor (3) can be efficiently led away by cooling the hollow shaft (15). At the same time, because the rotational-speed sensor (35) is attached not to the hollow shaft (15) but rather to the pipe (19), a compact rotational-speed sensor (35) can be used to measure a rotational speed or position of the rotor (3). |
