Pole-changing asynchronous fan motor with continuously adjustable speed

摘要

The invention relates to a fan installation with at least one pole- changing asynchronous motor (6, 7) for the driving of a fan (8, 9), a regulating device (14, 15) being provided by which the speed of rotation of the asynchronous motor (6, 7) is continuously regulatable within a predeterminable speed range by reducing the voltage. The speed of rotation of the fan (8, 9) can thus be matched to the required amount of air or quantity of heat to be dissipated by only a few switchovers or switchings-on.