Magnetic suspension device for e.g. turbopump, has control unit for controlling temperature of stator coil of electromagnet, and circuit for measuring voltage at terminals of stator coil

摘要

The device has a control unit (30) controlling the temperature of an electromagnet`s stator coil (25). A circuit (28) measures voltage (U) at terminals of the coil, and a determination circuit (31) determines coil`s static current (Io). Determination units are constituted of a divider (33), adding circuits (34, 35) and circuit (36) and determine the temperature from the measured voltage and current and value of electrical resistances (Rc, Ro) of a connecting wire (24) and the coil, respectively. A comparison circuit (37) compares the temperature and maximum admissible temperature (Tmax). An independent claim is also included for a method of controlling temperature of a stator coil.