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Przegląd możliwości doświadczalnego obciążenia silników wysokoobrotowych

Zieliński W.

Maszyny Elektryczne : zeszyty problemowe

2012

Nr 2(95)

89-92

High-speed motors are mainly used in the bearing, precision engineering and textile industries. In Poland, only one-off motors of this kind are produced. The developing high-speed technologies encourage work towards implementation of the production of high-speed motors for a suitable range of power, rotational speed and rotational speed regulation. Most of the operations performed during the production of rolling bearings are grinding operations. For this operation to be carried out in a precise manner, it is necessary to provide a grinding wheel with a peripheral speed of several dozen meters per second, which corresponds to 12 to several hundred thousand revolutions per minute. The basic components of grinders are high-speed asynchronous squirrel-cage motors, which have different characteristic properties than classic motors supplied with power-line frequency. Also laboratory testing of those motors is done in a different way. They are supplied from motor or thyristor frequency converters with a voltage of 200 ÷ 2000kH . The problem of loading a high-speed motor under laboratory conditions follows from the difficulty of mechanically coupling it to the test bench. In this article, an attempt was made to choose a simple, classical motor loading method for high-speed motors using known types of mechanical, electromagnetic and electrodynamic brakes.