Abstract: A redundant cooling device, for an electrical submarine drive motor, includes a first cooling circuit and a second cooling circuit, by which thermal energy may be removed from the electric submarine drive motor. A high degree of operational security and redundancy may be provided, whereby the coolant in the first cooling circuit and the second cooling circuit flow counter-currently through a stator cooling circuit in the region of the electrical submarine drive motor.

Abstract: A method is for controlling a multi-phase electrical ship propulsion motor that is supplied with electric energy via a power converter. The ship propulsion motor is preferably a permanently excited motor with at least three windings. The phase currents flowing in the windings are controlled via the power converter to minimize the body noise emitted by the electrical ship propulsion motor.

Abstract: A redundant cooling device, for an electrical submarine drive motor, includes a first cooling circuit and a second cooling circuit, by which thermal energy may be removed from the electric submarine drive motor. A high degree of operational security and redundancy may be provided, whereby the coolant in the first cooling circuit and the second cooling circuit flow counter-currently through a stator cooling circuit in the region of the electrical submarine drive motor.

Abstract: A current regulation process and device for a three-phase, static-converter-fed, permanently excited synchronous machine with a trapezoidal magnet wheel voltage. A phase angle sensor is mounted on the motor shaft of the machine and is coupled to an evaluating device providing an actual speed of rotation value. Current measurement devices measure the currents to the machine. A current actual value spatial vector is generated from two phase current actual values, which spatial vector is estimated as a function of a calculated normalized magnet wheel voltage, whose rotor flux-oriented current components are supplied to current regulators, which generate a voltage spatial vector. A simple field-oriented current regulation is achieved for a three-phase, static-converter-fed, permanently excited synchronous machine with a smooth torque at low rotation speeds and low intermediary circuit or battery current ripple at high rotation speeds.