An arrangement for preventing excessive heating in a winding of an electrical machine

摘要

904,615. Protective devices for dynamoelectric machines. SIEMENS-SCHUCKERTWERKE A.G. Feb. 17, 1961 [Feb. 19, 1960], No. 6031/61. Class 35. In the winding of an electrical machine, such as a single-phase motor, is located a heatsensitive, semi-conductor device whose resistance rapidly increases with temperature above the Curie temperature, thus reducing the current in the winding if it becomes overheated. The semi-conductor, which may be barium.titanate, barium-strontium titanate, barium-lead titanate, can be connected in series with the main winding or with an auxiliary phase winding of the motor.