Asynchronous and synchronous machines with excitation winding are mainly used on vessels and ships. PMSM have a higher efficiency with lower mass and dimensions, but are rarely used on vessels and ships, since it is possible that the PMSM may catch fire if an turn-to-turn fault occurs in the stator winding. The magnetic field of the rotor, produced by permanent magnets, when short-circuited in the stator winding on the run of the machine will produce an EMF, and a current in the circuit formed by the turn-to-turn fault, which can cause a fire. Placing a PMSM in a sealed enclosure does not completely exclude the possibility of catching fire by a device. It is possible to exclude catching fire of PMSM only by “suppressing” the magnetic field of the rotor. The article describes the design of a PMSM, which allows in an emergency situation suppressing the magnetic field of the rotor. For that end, permanent magnets are placed in blocks of magnets of cylindrical shape, the rotation of which can reduce the induction