Patent ID: 8242733

Claim:
Asynchronous AC induction electrical machines in cross-interlocked parallel connection, comprising: a first electrical machine and a second electrical machine, each said electrical machine having a control winding and a main winding, said control windings and main windings of the respective first and second electrical machines being coaxial or at a predetermined electrical angle difference, and said control windings and main windings having a same polarity for additive excitation or opposite polarities for differential excitation, said first and second electrical machines being parallel connected with a power source, as follows: first terminals of the first electrical machine main winding and second electrical machine main winding are connected with the power source for input or output of electrical power, a second terminal of the first electrical machine control winding is connected to a first terminal of the second electrical machine control winding, a second terminal of the second electrical machine main winding is connected to a first terminal of the first electrical machine control winding, and second terminals of the first and second electrical machine control windings are connected to each other, wherein changes in a load on one of the electrical machines causes changes in impedance in a winding of the other of the electrical machines to change a voltage ratio between the electrical machines and enable individual driving characteristics of the respective first and second electrical machines to change accordingly.