energy-saving motor control

energy-saving motor control elektor november 1980 — 11-39 Improved motor control systems can cut consumption down by 50%. Incredible as it seems, this is perfectly true under certain circumstances in some of the biggest domestic appliances, such as fridges, ventilators and washing machines, for instance. been making use of energy-saving motors for years. The present circuit, however, is based upon a radically different principle, for it gets rid of the source of the evil rather than correcting it later on with the aid of large capacitors switched in parallel, which is how the problem is normally taken care of. How does a motor work? Not all motors can be made to run economically. With the short circuit armature type, and luckily most domestic motors belong to this category, it can be done. This type of motor consists of a fixed ring of coils inside the case to generate a rotating magnetic field. The rotor is made of iron to be highly inductive. The rotor also contains a certain ...