GR871974B - Polyphase electric machine having controlled magnetic flux density - Google Patents

Abstract

There is a polyphase machine, either motor or generator, to which a stator core is given that consists of stator's coils and control winding. Referring to the induction motor squirrel cage example, the windings have been placed around the stator's core, as the main windings have in parallel a capacitor connected to each winding. In a three-phase motor, the control windings that are placed around the stator, have electric power in each phase that is created only when there is no load created from the power of the equivalent opposite main windings. These electric powers remain out of phase in relation to the electric powers of the main windings, when there is load increase. Control windings are placed in an opposite direction to the corresponding main windings in order for the clean flow density of the small load to be small and as the load increases, flow density increases as well. There is also an increase of the start bias and the break bias too, that is achieved due to the creation of poles that are corresponding to the main windings. The poles that are created by the control windings are placed in such a way that a power is being created due to the symmetry of the magnetic field. In that case, the centres of the windings' poles are placed as close as possible among the main windings' poles, improving in this way, the poles' magnetic centre. The voltage that exists along the condenser, which is added to the coming voltage, is possible to make the stator's core to be periodically connected with replete and non replete situations.