Abstract: A rotor of a rotary electric-machine according to the present invention includes a rotor core, a distributed winding wound around the rotor core, a ring member arranged at an end of the rotor core in the axial direction and having an outside diameter which is substantially equal to the outside diameter of the rotor core, and a coupling member for coupling an end portion of the distributed winding to the ring member. The ring member has a plurality of rings arranged at both ends of the rotor core in the axial direction. The rings are arranged one above another. The coupling member has a leading member with a curved portion for leading the end portion of the distributed winding toward the center of the rotor core and a fixture for fixing the leading member into an inner peripheral portion of the ring member.

Abstract: A control system of pumping operation comprises a cycloconverter for converting AC power from a AC power system into AC power having a given frequency, anAC exciting generator-motor, having a stator side electrically connected to the AC power system, having a rotor side electrically connected to the cycloconverter, and having a rotor shaft mechanically coupled to a pump-turbine by which the pumping operation is carried out, a circuit breaker inserted between the AC power system and the AC exciting generator-motor, a rotation speed controller for controlling a rotation speed of the AC exciting generator-motor such that the rotation speed becomes slow when the pumping operation is to be stopped, an AC excitation controller for decreasing a degree of excitation effected by the cycloconverter, wherein decreasing of the excitation degree starts when the rotation speed of the AC exciting generator-motor reaches a given minimum value, and a circuit breaker controller for turning off the circuit breaker when input po