Concentrated-winding electrical machines with floating exciter

A magnetic flux control system for controlling the magnetic flux in an electrical machine with concentrated windings, all connected in series and supplied by a common main power supply, said magnetic flux control system comprising:

• at least one magnetic balancing power supply;
• at least one balancing-current controller, powered by a respective one of said at least one magnetic balancing power supply;
• electrical connections configured to permit the connection of an output of said at least one balancing-current controller over a segment of said concentrated windings;
• said segment being less than the entirety of said concentrated windings;
• wherein said at least one magnetic balancing power supply provides galvanic isolation;
• at least one sensor configured to measure a parameter associated with at least one of:
• magnetic flux in an airgap between a stator and a rotor of said electrical machine in connection with said concentrated windings;
• force between said rotor and said stator;
• position of a shaft of said rotor relative said stator;
• vibrations in said rotor;
• vibrations in said stator;
• acoustic noise generated by said electrical machine;
• voltages generated by or supplied to said electrical machine;
• and
• currents generated by or supplied to said electrical machine;
• and
• said at least one balancing-current controller being connected to said at least one sensor;
• wherein each of said at least one balancing-current controller is configured to control a current, powered by said at least one magnetic balancing power supply, in dependence of a signal representing said measured parameter of said at least one sensor.