During the installation and maintenance of the phase-modulated generator, the generator rotor needs to be rotated to find the center, or the generator rotor needs to be rotated regularly to prevent the generator rotor from being stopped for a long time to prevent bending. The turning gear of the inverter is installed at the non-outgoing end. The turning gear can be engaged with the generator rotor under local manual control or remote automatic control, and the rotor of the phase-adjusting generator is rotated at a speed of 0~4.2 r/min.