Magström Ab

Magstöm Ab

Urban Lundin

Johan Abrahamsson

J Jose Perez-Loya

José Perez-loya

A magnetic flux control system () for controlling the magnetic flux in an electrical machine () with concentrated windings (A-C) has at least one magnetic balancing power supply (A-C), at least one balancing-current controller (A-C) and electrical connections () configured to permit the connection of the balancing-current controller(s) over a segment () of the concentrated windings. The balancing power supply provides galvanicisolation. The magnetic balancing system has further at least one sensor () configured to measure a parameter associated with a magnetic flux, a force, a position, vibrations, voltages, and/or currents. The balancing-current controller(s) (A-C) is(are) connected to the sensor(s) and is(are) powered by the balancing power supply(supplies). The balancing-current controller is configured to control an output current in dependence of a signal representing the measured parameter of the sensor(s). A winding excitation arrangement, an electrical machine and a method for balancing are also disclosed.

Concentrated-winding electrical machines with floating exciter

An electrical machine () comprises a rotor (), a stator (), a rotor power supply (), at least one sensor () and a rotor magnetization control arrangement (). The rotor has rotor windings () for controlling magnetization of rotor magnetic poles (). The sensor is arranged to measure a parameter associated with a relative force between the stator and the rotor. The rotor magnetization control arrangement is communicationally connected to the sensor for receiving a signal representing the measured parameter. The rotor magnetic poles are divided into at least two groups (). The rotor magnetization control arrangement is arranged for controlling the magnetization of the groups individually by providing a respective individually controllable rotor current. The rotor magnetization control arrangement is arranged to individually control the rotor currents in dependence of the signal representing the measured parameter. A method for controlling such an electrical machine is also disclosed.

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Uppsala, Sweden

Urban Lundin