Patent ID: 8203303

Claim:
Asynchronous AC induction electrical machines in cross-interlocked series 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 winding and main winding being coaxial or at a predetermined electrical angle difference, and said control winding and main winding having a same polarity for additive excitation or opposite polarities for differential excitation, said main and control windings of the first and second electrical machines being series connected with a power source, as follows: a first terminal of the first electrical machine control winding is connected to a second terminal of the second electrical machine main winding, a first terminal of the first electrical machine main winding is connected to a second terminal of the first electrical machine control winding, a first terminal of the second electrical machine main winding is connected with the power source for input or output of electrical power, a second terminal of the second electrical machine control winding is connected with the power source if the second electrical machine is a single phase electrical machine, a second terminal of the second electrical machine control winding is connected with the power source, or connected with second terminals of the control winding of each respective phase of the second electrical machine, if the second electrical machine is a multiple phase electrical machine, and a second terminal of the first electrical machine main winding is connected to a first terminal of the second electrical machine control winding, 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.